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64d329ee | 1 | /* sun4c.c: Doing in software what should be done in hardware. |
1da177e4 | 2 | * |
64d329ee | 3 | * Copyright (C) 1996 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) |
5 | * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au) | |
6 | * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org) | |
7 | * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
8 | */ | |
9 | ||
10 | #define NR_TASK_BUCKETS 512 | |
11 | ||
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/mm.h> | |
14 | #include <linux/init.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
1da177e4 LT |
16 | #include <linux/bootmem.h> |
17 | #include <linux/highmem.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/seq_file.h> | |
0912a5db | 20 | #include <linux/scatterlist.h> |
e756fd80 | 21 | #include <linux/bitmap.h> |
1da177e4 | 22 | |
86ed40bd | 23 | #include <asm/sections.h> |
1da177e4 LT |
24 | #include <asm/page.h> |
25 | #include <asm/pgalloc.h> | |
26 | #include <asm/pgtable.h> | |
27 | #include <asm/vaddrs.h> | |
28 | #include <asm/idprom.h> | |
29 | #include <asm/machines.h> | |
30 | #include <asm/memreg.h> | |
31 | #include <asm/processor.h> | |
32 | #include <asm/auxio.h> | |
33 | #include <asm/io.h> | |
34 | #include <asm/oplib.h> | |
35 | #include <asm/openprom.h> | |
36 | #include <asm/mmu_context.h> | |
1da177e4 LT |
37 | #include <asm/highmem.h> |
38 | #include <asm/btfixup.h> | |
39 | #include <asm/cacheflush.h> | |
40 | #include <asm/tlbflush.h> | |
41 | ||
42 | /* Because of our dynamic kernel TLB miss strategy, and how | |
43 | * our DVMA mapping allocation works, you _MUST_: | |
44 | * | |
45 | * 1) Disable interrupts _and_ not touch any dynamic kernel | |
46 | * memory while messing with kernel MMU state. By | |
47 | * dynamic memory I mean any object which is not in | |
48 | * the kernel image itself or a thread_union (both of | |
49 | * which are locked into the MMU). | |
50 | * 2) Disable interrupts while messing with user MMU state. | |
51 | */ | |
52 | ||
53 | extern int num_segmaps, num_contexts; | |
54 | ||
55 | extern unsigned long page_kernel; | |
56 | ||
1da177e4 LT |
57 | /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536. |
58 | * So let's save some cycles and just use that everywhere except for that bootup | |
59 | * sanity check. | |
60 | */ | |
61 | #define SUN4C_VAC_SIZE 65536 | |
1da177e4 LT |
62 | |
63 | #define SUN4C_KERNEL_BUCKETS 32 | |
64 | ||
65 | /* Flushing the cache. */ | |
66 | struct sun4c_vac_props sun4c_vacinfo; | |
67 | unsigned long sun4c_kernel_faults; | |
68 | ||
69 | /* Invalidate every sun4c cache line tag. */ | |
70 | static void __init sun4c_flush_all(void) | |
71 | { | |
72 | unsigned long begin, end; | |
73 | ||
74 | if (sun4c_vacinfo.on) | |
75 | panic("SUN4C: AIEEE, trying to invalidate vac while it is on."); | |
76 | ||
77 | /* Clear 'valid' bit in all cache line tags */ | |
78 | begin = AC_CACHETAGS; | |
79 | end = (AC_CACHETAGS + SUN4C_VAC_SIZE); | |
80 | while (begin < end) { | |
81 | __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : | |
82 | "r" (begin), "i" (ASI_CONTROL)); | |
83 | begin += sun4c_vacinfo.linesize; | |
84 | } | |
85 | } | |
86 | ||
87 | static void sun4c_flush_context_hw(void) | |
88 | { | |
89 | unsigned long end = SUN4C_VAC_SIZE; | |
90 | ||
91 | __asm__ __volatile__( | |
92 | "1: addcc %0, -4096, %0\n\t" | |
93 | " bne 1b\n\t" | |
94 | " sta %%g0, [%0] %2" | |
95 | : "=&r" (end) | |
96 | : "0" (end), "i" (ASI_HWFLUSHCONTEXT) | |
97 | : "cc"); | |
98 | } | |
99 | ||
100 | /* Must be called minimally with IRQs disabled. */ | |
101 | static void sun4c_flush_segment_hw(unsigned long addr) | |
102 | { | |
103 | if (sun4c_get_segmap(addr) != invalid_segment) { | |
104 | unsigned long vac_size = SUN4C_VAC_SIZE; | |
105 | ||
106 | __asm__ __volatile__( | |
107 | "1: addcc %0, -4096, %0\n\t" | |
108 | " bne 1b\n\t" | |
109 | " sta %%g0, [%2 + %0] %3" | |
110 | : "=&r" (vac_size) | |
111 | : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG) | |
112 | : "cc"); | |
113 | } | |
114 | } | |
115 | ||
116 | /* File local boot time fixups. */ | |
117 | BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long) | |
118 | BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long) | |
119 | BTFIXUPDEF_CALL(void, sun4c_flush_context, void) | |
120 | ||
121 | #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr) | |
122 | #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr) | |
123 | #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)() | |
124 | ||
125 | /* Must be called minimally with interrupts disabled. */ | |
126 | static void sun4c_flush_page_hw(unsigned long addr) | |
127 | { | |
128 | addr &= PAGE_MASK; | |
129 | if ((int)sun4c_get_pte(addr) < 0) | |
130 | __asm__ __volatile__("sta %%g0, [%0] %1" | |
131 | : : "r" (addr), "i" (ASI_HWFLUSHPAGE)); | |
132 | } | |
133 | ||
134 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
135 | static void sun4c_flush_context_sw(void) | |
136 | { | |
137 | unsigned long nbytes = SUN4C_VAC_SIZE; | |
138 | unsigned long lsize = sun4c_vacinfo.linesize; | |
139 | ||
140 | __asm__ __volatile__( | |
141 | "add %2, %2, %%g1\n\t" | |
142 | "add %2, %%g1, %%g2\n\t" | |
143 | "add %2, %%g2, %%g3\n\t" | |
144 | "add %2, %%g3, %%g4\n\t" | |
145 | "add %2, %%g4, %%g5\n\t" | |
146 | "add %2, %%g5, %%o4\n\t" | |
147 | "add %2, %%o4, %%o5\n" | |
148 | "1:\n\t" | |
149 | "subcc %0, %%o5, %0\n\t" | |
150 | "sta %%g0, [%0] %3\n\t" | |
151 | "sta %%g0, [%0 + %2] %3\n\t" | |
152 | "sta %%g0, [%0 + %%g1] %3\n\t" | |
153 | "sta %%g0, [%0 + %%g2] %3\n\t" | |
154 | "sta %%g0, [%0 + %%g3] %3\n\t" | |
155 | "sta %%g0, [%0 + %%g4] %3\n\t" | |
156 | "sta %%g0, [%0 + %%g5] %3\n\t" | |
157 | "bg 1b\n\t" | |
158 | " sta %%g0, [%1 + %%o4] %3\n" | |
159 | : "=&r" (nbytes) | |
160 | : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX) | |
161 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
162 | } | |
163 | ||
164 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
165 | static void sun4c_flush_segment_sw(unsigned long addr) | |
166 | { | |
167 | if (sun4c_get_segmap(addr) != invalid_segment) { | |
168 | unsigned long nbytes = SUN4C_VAC_SIZE; | |
169 | unsigned long lsize = sun4c_vacinfo.linesize; | |
170 | ||
171 | __asm__ __volatile__( | |
172 | "add %2, %2, %%g1\n\t" | |
173 | "add %2, %%g1, %%g2\n\t" | |
174 | "add %2, %%g2, %%g3\n\t" | |
175 | "add %2, %%g3, %%g4\n\t" | |
176 | "add %2, %%g4, %%g5\n\t" | |
177 | "add %2, %%g5, %%o4\n\t" | |
178 | "add %2, %%o4, %%o5\n" | |
179 | "1:\n\t" | |
180 | "subcc %1, %%o5, %1\n\t" | |
181 | "sta %%g0, [%0] %6\n\t" | |
182 | "sta %%g0, [%0 + %2] %6\n\t" | |
183 | "sta %%g0, [%0 + %%g1] %6\n\t" | |
184 | "sta %%g0, [%0 + %%g2] %6\n\t" | |
185 | "sta %%g0, [%0 + %%g3] %6\n\t" | |
186 | "sta %%g0, [%0 + %%g4] %6\n\t" | |
187 | "sta %%g0, [%0 + %%g5] %6\n\t" | |
188 | "sta %%g0, [%0 + %%o4] %6\n\t" | |
189 | "bg 1b\n\t" | |
190 | " add %0, %%o5, %0\n" | |
191 | : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize) | |
192 | : "0" (addr), "1" (nbytes), "2" (lsize), | |
193 | "i" (ASI_FLUSHSEG) | |
194 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
195 | } | |
196 | } | |
197 | ||
198 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
199 | static void sun4c_flush_page_sw(unsigned long addr) | |
200 | { | |
201 | addr &= PAGE_MASK; | |
202 | if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) == | |
203 | _SUN4C_PAGE_VALID) { | |
204 | unsigned long left = PAGE_SIZE; | |
205 | unsigned long lsize = sun4c_vacinfo.linesize; | |
206 | ||
207 | __asm__ __volatile__( | |
208 | "add %2, %2, %%g1\n\t" | |
209 | "add %2, %%g1, %%g2\n\t" | |
210 | "add %2, %%g2, %%g3\n\t" | |
211 | "add %2, %%g3, %%g4\n\t" | |
212 | "add %2, %%g4, %%g5\n\t" | |
213 | "add %2, %%g5, %%o4\n\t" | |
214 | "add %2, %%o4, %%o5\n" | |
215 | "1:\n\t" | |
216 | "subcc %1, %%o5, %1\n\t" | |
217 | "sta %%g0, [%0] %6\n\t" | |
218 | "sta %%g0, [%0 + %2] %6\n\t" | |
219 | "sta %%g0, [%0 + %%g1] %6\n\t" | |
220 | "sta %%g0, [%0 + %%g2] %6\n\t" | |
221 | "sta %%g0, [%0 + %%g3] %6\n\t" | |
222 | "sta %%g0, [%0 + %%g4] %6\n\t" | |
223 | "sta %%g0, [%0 + %%g5] %6\n\t" | |
224 | "sta %%g0, [%0 + %%o4] %6\n\t" | |
225 | "bg 1b\n\t" | |
226 | " add %0, %%o5, %0\n" | |
227 | : "=&r" (addr), "=&r" (left), "=&r" (lsize) | |
228 | : "0" (addr), "1" (left), "2" (lsize), | |
229 | "i" (ASI_FLUSHPG) | |
230 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
231 | } | |
232 | } | |
233 | ||
234 | /* The sun4c's do have an on chip store buffer. And the way you | |
235 | * clear them out isn't so obvious. The only way I can think of | |
236 | * to accomplish this is to read the current context register, | |
237 | * store the same value there, then read an external hardware | |
238 | * register. | |
239 | */ | |
240 | void sun4c_complete_all_stores(void) | |
241 | { | |
242 | volatile int _unused; | |
243 | ||
244 | _unused = sun4c_get_context(); | |
245 | sun4c_set_context(_unused); | |
1da177e4 | 246 | _unused = get_auxio(); |
1da177e4 LT |
247 | } |
248 | ||
249 | /* Bootup utility functions. */ | |
250 | static inline void sun4c_init_clean_segmap(unsigned char pseg) | |
251 | { | |
252 | unsigned long vaddr; | |
253 | ||
254 | sun4c_put_segmap(0, pseg); | |
255 | for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE) | |
256 | sun4c_put_pte(vaddr, 0); | |
257 | sun4c_put_segmap(0, invalid_segment); | |
258 | } | |
259 | ||
260 | static inline void sun4c_init_clean_mmu(unsigned long kernel_end) | |
261 | { | |
262 | unsigned long vaddr; | |
263 | unsigned char savectx, ctx; | |
264 | ||
265 | savectx = sun4c_get_context(); | |
1da177e4 LT |
266 | for (ctx = 0; ctx < num_contexts; ctx++) { |
267 | sun4c_set_context(ctx); | |
268 | for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
269 | sun4c_put_segmap(vaddr, invalid_segment); | |
270 | for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
271 | sun4c_put_segmap(vaddr, invalid_segment); | |
272 | for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
273 | sun4c_put_segmap(vaddr, invalid_segment); | |
274 | for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
275 | sun4c_put_segmap(vaddr, invalid_segment); | |
276 | } | |
277 | sun4c_set_context(savectx); | |
278 | } | |
279 | ||
280 | void __init sun4c_probe_vac(void) | |
281 | { | |
282 | sun4c_disable_vac(); | |
283 | ||
5110bd21 AB |
284 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || |
285 | (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { | |
286 | /* PROM on SS1 lacks this info, to be super safe we | |
287 | * hard code it here since this arch is cast in stone. | |
288 | */ | |
289 | sun4c_vacinfo.num_bytes = 65536; | |
290 | sun4c_vacinfo.linesize = 16; | |
1da177e4 | 291 | } else { |
5110bd21 AB |
292 | sun4c_vacinfo.num_bytes = |
293 | prom_getintdefault(prom_root_node, "vac-size", 65536); | |
294 | sun4c_vacinfo.linesize = | |
295 | prom_getintdefault(prom_root_node, "vac-linesize", 16); | |
296 | } | |
297 | sun4c_vacinfo.do_hwflushes = | |
298 | prom_getintdefault(prom_root_node, "vac-hwflush", 0); | |
1da177e4 | 299 | |
5110bd21 AB |
300 | if (sun4c_vacinfo.do_hwflushes == 0) |
301 | sun4c_vacinfo.do_hwflushes = | |
302 | prom_getintdefault(prom_root_node, "vac_hwflush", 0); | |
1da177e4 | 303 | |
5110bd21 AB |
304 | if (sun4c_vacinfo.num_bytes != 65536) { |
305 | prom_printf("WEIRD Sun4C VAC cache size, " | |
306 | "tell sparclinux@vger.kernel.org"); | |
307 | prom_halt(); | |
1da177e4 LT |
308 | } |
309 | ||
1da177e4 LT |
310 | switch (sun4c_vacinfo.linesize) { |
311 | case 16: | |
312 | sun4c_vacinfo.log2lsize = 4; | |
313 | break; | |
314 | case 32: | |
315 | sun4c_vacinfo.log2lsize = 5; | |
316 | break; | |
317 | default: | |
318 | prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n", | |
319 | sun4c_vacinfo.linesize); | |
320 | prom_halt(); | |
321 | }; | |
322 | ||
323 | sun4c_flush_all(); | |
324 | sun4c_enable_vac(); | |
325 | } | |
326 | ||
327 | /* Patch instructions for the low level kernel fault handler. */ | |
328 | extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff; | |
329 | extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff; | |
330 | extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff; | |
331 | extern unsigned long num_context_patch1, num_context_patch1_16; | |
332 | extern unsigned long num_context_patch2_16; | |
333 | extern unsigned long vac_linesize_patch, vac_linesize_patch_32; | |
334 | extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on; | |
335 | extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on; | |
336 | ||
337 | #define PATCH_INSN(src, dst) do { \ | |
338 | daddr = &(dst); \ | |
339 | iaddr = &(src); \ | |
340 | *daddr = *iaddr; \ | |
341 | } while (0) | |
342 | ||
343 | static void __init patch_kernel_fault_handler(void) | |
344 | { | |
345 | unsigned long *iaddr, *daddr; | |
346 | ||
347 | switch (num_segmaps) { | |
348 | case 128: | |
349 | /* Default, nothing to do. */ | |
350 | break; | |
351 | case 256: | |
352 | PATCH_INSN(invalid_segment_patch1_ff, | |
353 | invalid_segment_patch1); | |
354 | PATCH_INSN(invalid_segment_patch2_ff, | |
355 | invalid_segment_patch2); | |
356 | break; | |
357 | case 512: | |
358 | PATCH_INSN(invalid_segment_patch1_1ff, | |
359 | invalid_segment_patch1); | |
360 | PATCH_INSN(invalid_segment_patch2_1ff, | |
361 | invalid_segment_patch2); | |
362 | break; | |
363 | default: | |
364 | prom_printf("Unhandled number of segmaps: %d\n", | |
365 | num_segmaps); | |
366 | prom_halt(); | |
367 | }; | |
368 | switch (num_contexts) { | |
369 | case 8: | |
370 | /* Default, nothing to do. */ | |
371 | break; | |
372 | case 16: | |
373 | PATCH_INSN(num_context_patch1_16, | |
374 | num_context_patch1); | |
375 | break; | |
376 | default: | |
377 | prom_printf("Unhandled number of contexts: %d\n", | |
378 | num_contexts); | |
379 | prom_halt(); | |
380 | }; | |
381 | ||
382 | if (sun4c_vacinfo.do_hwflushes != 0) { | |
383 | PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1); | |
384 | PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2); | |
385 | } else { | |
386 | switch (sun4c_vacinfo.linesize) { | |
387 | case 16: | |
388 | /* Default, nothing to do. */ | |
389 | break; | |
390 | case 32: | |
391 | PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch); | |
392 | break; | |
393 | default: | |
394 | prom_printf("Impossible VAC linesize %d, halting...\n", | |
395 | sun4c_vacinfo.linesize); | |
396 | prom_halt(); | |
397 | }; | |
398 | } | |
399 | } | |
400 | ||
401 | static void __init sun4c_probe_mmu(void) | |
402 | { | |
5110bd21 AB |
403 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || |
404 | (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { | |
405 | /* Hardcode these just to be safe, PROM on SS1 does | |
406 | * not have this info available in the root node. | |
407 | */ | |
408 | num_segmaps = 128; | |
409 | num_contexts = 8; | |
1da177e4 | 410 | } else { |
5110bd21 AB |
411 | num_segmaps = |
412 | prom_getintdefault(prom_root_node, "mmu-npmg", 128); | |
413 | num_contexts = | |
414 | prom_getintdefault(prom_root_node, "mmu-nctx", 0x8); | |
1da177e4 LT |
415 | } |
416 | patch_kernel_fault_handler(); | |
417 | } | |
418 | ||
a3297296 | 419 | volatile unsigned long __iomem *sun4c_memerr_reg = NULL; |
1da177e4 LT |
420 | |
421 | void __init sun4c_probe_memerr_reg(void) | |
422 | { | |
423 | int node; | |
424 | struct linux_prom_registers regs[1]; | |
425 | ||
5110bd21 AB |
426 | node = prom_getchild(prom_root_node); |
427 | node = prom_searchsiblings(prom_root_node, "memory-error"); | |
428 | if (!node) | |
429 | return; | |
430 | if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0) | |
431 | return; | |
432 | /* hmm I think regs[0].which_io is zero here anyways */ | |
433 | sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size); | |
1da177e4 LT |
434 | } |
435 | ||
436 | static inline void sun4c_init_ss2_cache_bug(void) | |
437 | { | |
438 | extern unsigned long start; | |
439 | ||
440 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) || | |
441 | (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) || | |
1da177e4 LT |
442 | (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) { |
443 | /* Whee.. */ | |
444 | printk("SS2 cache bug detected, uncaching trap table page\n"); | |
445 | sun4c_flush_page((unsigned int) &start); | |
446 | sun4c_put_pte(((unsigned long) &start), | |
447 | (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE)); | |
448 | } | |
449 | } | |
450 | ||
451 | /* Addr is always aligned on a page boundary for us already. */ | |
4b1c5df2 DM |
452 | static int sun4c_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va, |
453 | unsigned long addr, int len) | |
1da177e4 LT |
454 | { |
455 | unsigned long page, end; | |
456 | ||
457 | *pba = addr; | |
458 | ||
459 | end = PAGE_ALIGN((addr + len)); | |
460 | while (addr < end) { | |
461 | page = va; | |
462 | sun4c_flush_page(page); | |
463 | page -= PAGE_OFFSET; | |
464 | page >>= PAGE_SHIFT; | |
465 | page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY | | |
466 | _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV); | |
467 | sun4c_put_pte(addr, page); | |
468 | addr += PAGE_SIZE; | |
469 | va += PAGE_SIZE; | |
470 | } | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
4b1c5df2 | 475 | static void sun4c_unmap_dma_area(struct device *dev, unsigned long busa, int len) |
1da177e4 LT |
476 | { |
477 | /* Fortunately for us, bus_addr == uncached_virt in sun4c. */ | |
478 | /* XXX Implement this */ | |
479 | } | |
480 | ||
481 | /* TLB management. */ | |
482 | ||
483 | /* Don't change this struct without changing entry.S. This is used | |
484 | * in the in-window kernel fault handler, and you don't want to mess | |
485 | * with that. (See sun4c_fault in entry.S). | |
486 | */ | |
487 | struct sun4c_mmu_entry { | |
488 | struct sun4c_mmu_entry *next; | |
489 | struct sun4c_mmu_entry *prev; | |
490 | unsigned long vaddr; | |
491 | unsigned char pseg; | |
492 | unsigned char locked; | |
493 | ||
494 | /* For user mappings only, and completely hidden from kernel | |
495 | * TLB miss code. | |
496 | */ | |
497 | unsigned char ctx; | |
498 | struct sun4c_mmu_entry *lru_next; | |
499 | struct sun4c_mmu_entry *lru_prev; | |
500 | }; | |
501 | ||
502 | static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS]; | |
503 | ||
504 | static void __init sun4c_init_mmu_entry_pool(void) | |
505 | { | |
506 | int i; | |
507 | ||
508 | for (i=0; i < SUN4C_MAX_SEGMAPS; i++) { | |
509 | mmu_entry_pool[i].pseg = i; | |
510 | mmu_entry_pool[i].next = NULL; | |
511 | mmu_entry_pool[i].prev = NULL; | |
512 | mmu_entry_pool[i].vaddr = 0; | |
513 | mmu_entry_pool[i].locked = 0; | |
514 | mmu_entry_pool[i].ctx = 0; | |
515 | mmu_entry_pool[i].lru_next = NULL; | |
516 | mmu_entry_pool[i].lru_prev = NULL; | |
517 | } | |
518 | mmu_entry_pool[invalid_segment].locked = 1; | |
519 | } | |
520 | ||
521 | static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on, | |
522 | unsigned long bits_off) | |
523 | { | |
524 | unsigned long start, end; | |
525 | ||
526 | end = vaddr + SUN4C_REAL_PGDIR_SIZE; | |
527 | for (start = vaddr; start < end; start += PAGE_SIZE) | |
528 | if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID) | |
529 | sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) & | |
530 | ~bits_off); | |
531 | } | |
532 | ||
533 | static inline void sun4c_init_map_kernelprom(unsigned long kernel_end) | |
534 | { | |
535 | unsigned long vaddr; | |
536 | unsigned char pseg, ctx; | |
5110bd21 | 537 | |
1da177e4 LT |
538 | for (vaddr = KADB_DEBUGGER_BEGVM; |
539 | vaddr < LINUX_OPPROM_ENDVM; | |
540 | vaddr += SUN4C_REAL_PGDIR_SIZE) { | |
541 | pseg = sun4c_get_segmap(vaddr); | |
542 | if (pseg != invalid_segment) { | |
543 | mmu_entry_pool[pseg].locked = 1; | |
544 | for (ctx = 0; ctx < num_contexts; ctx++) | |
545 | prom_putsegment(ctx, vaddr, pseg); | |
546 | fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0); | |
547 | } | |
548 | } | |
5110bd21 | 549 | |
1da177e4 LT |
550 | for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) { |
551 | pseg = sun4c_get_segmap(vaddr); | |
552 | mmu_entry_pool[pseg].locked = 1; | |
553 | for (ctx = 0; ctx < num_contexts; ctx++) | |
554 | prom_putsegment(ctx, vaddr, pseg); | |
555 | fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE); | |
556 | } | |
557 | } | |
558 | ||
559 | static void __init sun4c_init_lock_area(unsigned long start, unsigned long end) | |
560 | { | |
561 | int i, ctx; | |
562 | ||
563 | while (start < end) { | |
564 | for (i = 0; i < invalid_segment; i++) | |
565 | if (!mmu_entry_pool[i].locked) | |
566 | break; | |
567 | mmu_entry_pool[i].locked = 1; | |
568 | sun4c_init_clean_segmap(i); | |
569 | for (ctx = 0; ctx < num_contexts; ctx++) | |
570 | prom_putsegment(ctx, start, mmu_entry_pool[i].pseg); | |
571 | start += SUN4C_REAL_PGDIR_SIZE; | |
572 | } | |
573 | } | |
574 | ||
575 | /* Don't change this struct without changing entry.S. This is used | |
576 | * in the in-window kernel fault handler, and you don't want to mess | |
577 | * with that. (See sun4c_fault in entry.S). | |
578 | */ | |
579 | struct sun4c_mmu_ring { | |
580 | struct sun4c_mmu_entry ringhd; | |
581 | int num_entries; | |
582 | }; | |
583 | ||
584 | static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */ | |
585 | static struct sun4c_mmu_ring sun4c_ufree_ring; /* free user entries */ | |
586 | static struct sun4c_mmu_ring sun4c_ulru_ring; /* LRU user entries */ | |
587 | struct sun4c_mmu_ring sun4c_kernel_ring; /* used kernel entries */ | |
588 | struct sun4c_mmu_ring sun4c_kfree_ring; /* free kernel entries */ | |
589 | ||
590 | static inline void sun4c_init_rings(void) | |
591 | { | |
592 | int i; | |
593 | ||
594 | for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) { | |
595 | sun4c_context_ring[i].ringhd.next = | |
596 | sun4c_context_ring[i].ringhd.prev = | |
597 | &sun4c_context_ring[i].ringhd; | |
598 | sun4c_context_ring[i].num_entries = 0; | |
599 | } | |
600 | sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev = | |
601 | &sun4c_ufree_ring.ringhd; | |
602 | sun4c_ufree_ring.num_entries = 0; | |
603 | sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev = | |
604 | &sun4c_ulru_ring.ringhd; | |
605 | sun4c_ulru_ring.num_entries = 0; | |
606 | sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev = | |
607 | &sun4c_kernel_ring.ringhd; | |
608 | sun4c_kernel_ring.num_entries = 0; | |
609 | sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev = | |
610 | &sun4c_kfree_ring.ringhd; | |
611 | sun4c_kfree_ring.num_entries = 0; | |
612 | } | |
613 | ||
614 | static void add_ring(struct sun4c_mmu_ring *ring, | |
615 | struct sun4c_mmu_entry *entry) | |
616 | { | |
617 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
618 | ||
619 | entry->prev = head; | |
620 | (entry->next = head->next)->prev = entry; | |
621 | head->next = entry; | |
622 | ring->num_entries++; | |
623 | } | |
624 | ||
64d329ee | 625 | static inline void add_lru(struct sun4c_mmu_entry *entry) |
1da177e4 LT |
626 | { |
627 | struct sun4c_mmu_ring *ring = &sun4c_ulru_ring; | |
628 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
629 | ||
630 | entry->lru_next = head; | |
631 | (entry->lru_prev = head->lru_prev)->lru_next = entry; | |
632 | head->lru_prev = entry; | |
633 | } | |
634 | ||
635 | static void add_ring_ordered(struct sun4c_mmu_ring *ring, | |
636 | struct sun4c_mmu_entry *entry) | |
637 | { | |
638 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
639 | unsigned long addr = entry->vaddr; | |
640 | ||
641 | while ((head->next != &ring->ringhd) && (head->next->vaddr < addr)) | |
642 | head = head->next; | |
643 | ||
644 | entry->prev = head; | |
645 | (entry->next = head->next)->prev = entry; | |
646 | head->next = entry; | |
647 | ring->num_entries++; | |
648 | ||
649 | add_lru(entry); | |
650 | } | |
651 | ||
64d329ee | 652 | static inline void remove_ring(struct sun4c_mmu_ring *ring, |
1da177e4 LT |
653 | struct sun4c_mmu_entry *entry) |
654 | { | |
655 | struct sun4c_mmu_entry *next = entry->next; | |
656 | ||
657 | (next->prev = entry->prev)->next = next; | |
658 | ring->num_entries--; | |
659 | } | |
660 | ||
661 | static void remove_lru(struct sun4c_mmu_entry *entry) | |
662 | { | |
663 | struct sun4c_mmu_entry *next = entry->lru_next; | |
664 | ||
665 | (next->lru_prev = entry->lru_prev)->lru_next = next; | |
666 | } | |
667 | ||
668 | static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry) | |
669 | { | |
670 | remove_ring(sun4c_context_ring+ctx, entry); | |
671 | remove_lru(entry); | |
672 | add_ring(&sun4c_ufree_ring, entry); | |
673 | } | |
674 | ||
675 | static void free_kernel_entry(struct sun4c_mmu_entry *entry, | |
676 | struct sun4c_mmu_ring *ring) | |
677 | { | |
678 | remove_ring(ring, entry); | |
679 | add_ring(&sun4c_kfree_ring, entry); | |
680 | } | |
681 | ||
682 | static void __init sun4c_init_fill_kernel_ring(int howmany) | |
683 | { | |
684 | int i; | |
685 | ||
686 | while (howmany) { | |
687 | for (i = 0; i < invalid_segment; i++) | |
688 | if (!mmu_entry_pool[i].locked) | |
689 | break; | |
690 | mmu_entry_pool[i].locked = 1; | |
691 | sun4c_init_clean_segmap(i); | |
692 | add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]); | |
693 | howmany--; | |
694 | } | |
695 | } | |
696 | ||
697 | static void __init sun4c_init_fill_user_ring(void) | |
698 | { | |
699 | int i; | |
700 | ||
701 | for (i = 0; i < invalid_segment; i++) { | |
702 | if (mmu_entry_pool[i].locked) | |
703 | continue; | |
704 | sun4c_init_clean_segmap(i); | |
705 | add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]); | |
706 | } | |
707 | } | |
708 | ||
709 | static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry) | |
710 | { | |
711 | int savectx, ctx; | |
712 | ||
713 | savectx = sun4c_get_context(); | |
714 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
715 | sun4c_set_context(ctx); | |
716 | sun4c_put_segmap(kentry->vaddr, invalid_segment); | |
717 | } | |
718 | sun4c_set_context(savectx); | |
719 | } | |
720 | ||
721 | static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry) | |
722 | { | |
723 | int savectx, ctx; | |
724 | ||
725 | savectx = sun4c_get_context(); | |
726 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
727 | sun4c_set_context(ctx); | |
728 | sun4c_put_segmap(kentry->vaddr, kentry->pseg); | |
729 | } | |
730 | sun4c_set_context(savectx); | |
731 | } | |
732 | ||
733 | #define sun4c_user_unmap(__entry) \ | |
734 | sun4c_put_segmap((__entry)->vaddr, invalid_segment) | |
735 | ||
736 | static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx) | |
737 | { | |
738 | struct sun4c_mmu_entry *head = &crp->ringhd; | |
739 | unsigned long flags; | |
740 | ||
741 | local_irq_save(flags); | |
742 | if (head->next != head) { | |
743 | struct sun4c_mmu_entry *entry = head->next; | |
744 | int savectx = sun4c_get_context(); | |
745 | ||
746 | flush_user_windows(); | |
747 | sun4c_set_context(ctx); | |
748 | sun4c_flush_context(); | |
749 | do { | |
750 | struct sun4c_mmu_entry *next = entry->next; | |
751 | ||
752 | sun4c_user_unmap(entry); | |
753 | free_user_entry(ctx, entry); | |
754 | ||
755 | entry = next; | |
756 | } while (entry != head); | |
757 | sun4c_set_context(savectx); | |
758 | } | |
759 | local_irq_restore(flags); | |
760 | } | |
761 | ||
762 | static int sun4c_user_taken_entries; /* This is how much we have. */ | |
763 | static int max_user_taken_entries; /* This limits us and prevents deadlock. */ | |
764 | ||
765 | static struct sun4c_mmu_entry *sun4c_kernel_strategy(void) | |
766 | { | |
767 | struct sun4c_mmu_entry *this_entry; | |
768 | ||
769 | /* If some are free, return first one. */ | |
770 | if (sun4c_kfree_ring.num_entries) { | |
771 | this_entry = sun4c_kfree_ring.ringhd.next; | |
772 | return this_entry; | |
773 | } | |
774 | ||
775 | /* Else free one up. */ | |
776 | this_entry = sun4c_kernel_ring.ringhd.prev; | |
777 | sun4c_flush_segment(this_entry->vaddr); | |
778 | sun4c_kernel_unmap(this_entry); | |
779 | free_kernel_entry(this_entry, &sun4c_kernel_ring); | |
780 | this_entry = sun4c_kfree_ring.ringhd.next; | |
781 | ||
782 | return this_entry; | |
783 | } | |
784 | ||
785 | /* Using this method to free up mmu entries eliminates a lot of | |
786 | * potential races since we have a kernel that incurs tlb | |
787 | * replacement faults. There may be performance penalties. | |
788 | * | |
789 | * NOTE: Must be called with interrupts disabled. | |
790 | */ | |
791 | static struct sun4c_mmu_entry *sun4c_user_strategy(void) | |
792 | { | |
793 | struct sun4c_mmu_entry *entry; | |
794 | unsigned char ctx; | |
795 | int savectx; | |
796 | ||
797 | /* If some are free, return first one. */ | |
798 | if (sun4c_ufree_ring.num_entries) { | |
799 | entry = sun4c_ufree_ring.ringhd.next; | |
800 | goto unlink_out; | |
801 | } | |
802 | ||
803 | if (sun4c_user_taken_entries) { | |
804 | entry = sun4c_kernel_strategy(); | |
805 | sun4c_user_taken_entries--; | |
806 | goto kunlink_out; | |
807 | } | |
808 | ||
809 | /* Grab from the beginning of the LRU list. */ | |
810 | entry = sun4c_ulru_ring.ringhd.lru_next; | |
811 | ctx = entry->ctx; | |
812 | ||
813 | savectx = sun4c_get_context(); | |
814 | flush_user_windows(); | |
815 | sun4c_set_context(ctx); | |
816 | sun4c_flush_segment(entry->vaddr); | |
817 | sun4c_user_unmap(entry); | |
818 | remove_ring(sun4c_context_ring + ctx, entry); | |
819 | remove_lru(entry); | |
820 | sun4c_set_context(savectx); | |
821 | ||
822 | return entry; | |
823 | ||
824 | unlink_out: | |
825 | remove_ring(&sun4c_ufree_ring, entry); | |
826 | return entry; | |
827 | kunlink_out: | |
828 | remove_ring(&sun4c_kfree_ring, entry); | |
829 | return entry; | |
830 | } | |
831 | ||
832 | /* NOTE: Must be called with interrupts disabled. */ | |
833 | void sun4c_grow_kernel_ring(void) | |
834 | { | |
835 | struct sun4c_mmu_entry *entry; | |
836 | ||
837 | /* Prevent deadlock condition. */ | |
838 | if (sun4c_user_taken_entries >= max_user_taken_entries) | |
839 | return; | |
840 | ||
841 | if (sun4c_ufree_ring.num_entries) { | |
842 | entry = sun4c_ufree_ring.ringhd.next; | |
843 | remove_ring(&sun4c_ufree_ring, entry); | |
844 | add_ring(&sun4c_kfree_ring, entry); | |
845 | sun4c_user_taken_entries++; | |
846 | } | |
847 | } | |
848 | ||
849 | /* 2 page buckets for task struct and kernel stack allocation. | |
850 | * | |
851 | * TASK_STACK_BEGIN | |
852 | * bucket[0] | |
853 | * bucket[1] | |
854 | * [ ... ] | |
855 | * bucket[NR_TASK_BUCKETS-1] | |
856 | * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS) | |
857 | * | |
858 | * Each slot looks like: | |
859 | * | |
860 | * page 1 -- task struct + beginning of kernel stack | |
861 | * page 2 -- rest of kernel stack | |
862 | */ | |
863 | ||
864 | union task_union *sun4c_bucket[NR_TASK_BUCKETS]; | |
865 | ||
866 | static int sun4c_lowbucket_avail; | |
867 | ||
868 | #define BUCKET_EMPTY ((union task_union *) 0) | |
869 | #define BUCKET_SHIFT (PAGE_SHIFT + 1) /* log2(sizeof(struct task_bucket)) */ | |
870 | #define BUCKET_SIZE (1 << BUCKET_SHIFT) | |
871 | #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT)) | |
872 | #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR) | |
873 | #define BUCKET_PTE(page) \ | |
874 | ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL)) | |
875 | #define BUCKET_PTE_PAGE(pte) \ | |
876 | (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT)) | |
877 | ||
878 | static void get_locked_segment(unsigned long addr) | |
879 | { | |
880 | struct sun4c_mmu_entry *stolen; | |
881 | unsigned long flags; | |
882 | ||
883 | local_irq_save(flags); | |
884 | addr &= SUN4C_REAL_PGDIR_MASK; | |
885 | stolen = sun4c_user_strategy(); | |
886 | max_user_taken_entries--; | |
887 | stolen->vaddr = addr; | |
888 | flush_user_windows(); | |
889 | sun4c_kernel_map(stolen); | |
890 | local_irq_restore(flags); | |
891 | } | |
892 | ||
893 | static void free_locked_segment(unsigned long addr) | |
894 | { | |
895 | struct sun4c_mmu_entry *entry; | |
896 | unsigned long flags; | |
897 | unsigned char pseg; | |
898 | ||
899 | local_irq_save(flags); | |
900 | addr &= SUN4C_REAL_PGDIR_MASK; | |
901 | pseg = sun4c_get_segmap(addr); | |
902 | entry = &mmu_entry_pool[pseg]; | |
903 | ||
904 | flush_user_windows(); | |
905 | sun4c_flush_segment(addr); | |
906 | sun4c_kernel_unmap(entry); | |
907 | add_ring(&sun4c_ufree_ring, entry); | |
908 | max_user_taken_entries++; | |
909 | local_irq_restore(flags); | |
910 | } | |
911 | ||
912 | static inline void garbage_collect(int entry) | |
913 | { | |
914 | int start, end; | |
915 | ||
916 | /* 32 buckets per segment... */ | |
917 | entry &= ~31; | |
918 | start = entry; | |
919 | for (end = (start + 32); start < end; start++) | |
920 | if (sun4c_bucket[start] != BUCKET_EMPTY) | |
921 | return; | |
922 | ||
923 | /* Entire segment empty, release it. */ | |
924 | free_locked_segment(BUCKET_ADDR(entry)); | |
925 | } | |
926 | ||
927 | static struct thread_info *sun4c_alloc_thread_info(void) | |
928 | { | |
929 | unsigned long addr, pages; | |
930 | int entry; | |
931 | ||
932 | pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER); | |
933 | if (!pages) | |
934 | return NULL; | |
935 | ||
936 | for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++) | |
937 | if (sun4c_bucket[entry] == BUCKET_EMPTY) | |
938 | break; | |
939 | if (entry == NR_TASK_BUCKETS) { | |
940 | free_pages(pages, THREAD_INFO_ORDER); | |
941 | return NULL; | |
942 | } | |
943 | if (entry >= sun4c_lowbucket_avail) | |
944 | sun4c_lowbucket_avail = entry + 1; | |
945 | ||
946 | addr = BUCKET_ADDR(entry); | |
947 | sun4c_bucket[entry] = (union task_union *) addr; | |
948 | if(sun4c_get_segmap(addr) == invalid_segment) | |
949 | get_locked_segment(addr); | |
950 | ||
951 | /* We are changing the virtual color of the page(s) | |
952 | * so we must flush the cache to guarantee consistency. | |
953 | */ | |
954 | sun4c_flush_page(pages); | |
1da177e4 | 955 | sun4c_flush_page(pages + PAGE_SIZE); |
1da177e4 LT |
956 | |
957 | sun4c_put_pte(addr, BUCKET_PTE(pages)); | |
1da177e4 | 958 | sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE)); |
1da177e4 LT |
959 | |
960 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
961 | memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER); | |
962 | #endif /* DEBUG_STACK_USAGE */ | |
963 | ||
964 | return (struct thread_info *) addr; | |
965 | } | |
966 | ||
967 | static void sun4c_free_thread_info(struct thread_info *ti) | |
968 | { | |
969 | unsigned long tiaddr = (unsigned long) ti; | |
970 | unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr)); | |
971 | int entry = BUCKET_NUM(tiaddr); | |
972 | ||
973 | /* We are deleting a mapping, so the flush here is mandatory. */ | |
974 | sun4c_flush_page(tiaddr); | |
1da177e4 | 975 | sun4c_flush_page(tiaddr + PAGE_SIZE); |
5110bd21 | 976 | |
1da177e4 | 977 | sun4c_put_pte(tiaddr, 0); |
1da177e4 | 978 | sun4c_put_pte(tiaddr + PAGE_SIZE, 0); |
5110bd21 | 979 | |
1da177e4 LT |
980 | sun4c_bucket[entry] = BUCKET_EMPTY; |
981 | if (entry < sun4c_lowbucket_avail) | |
982 | sun4c_lowbucket_avail = entry; | |
983 | ||
984 | free_pages(pages, THREAD_INFO_ORDER); | |
985 | garbage_collect(entry); | |
986 | } | |
987 | ||
988 | static void __init sun4c_init_buckets(void) | |
989 | { | |
990 | int entry; | |
991 | ||
992 | if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) { | |
993 | extern void thread_info_size_is_bolixed_pete(void); | |
994 | thread_info_size_is_bolixed_pete(); | |
995 | } | |
996 | ||
997 | for (entry = 0; entry < NR_TASK_BUCKETS; entry++) | |
998 | sun4c_bucket[entry] = BUCKET_EMPTY; | |
999 | sun4c_lowbucket_avail = 0; | |
1000 | } | |
1001 | ||
1002 | static unsigned long sun4c_iobuffer_start; | |
1003 | static unsigned long sun4c_iobuffer_end; | |
1004 | static unsigned long sun4c_iobuffer_high; | |
1005 | static unsigned long *sun4c_iobuffer_map; | |
1006 | static int iobuffer_map_size; | |
1007 | ||
1008 | /* | |
1009 | * Alias our pages so they do not cause a trap. | |
1010 | * Also one page may be aliased into several I/O areas and we may | |
1011 | * finish these I/O separately. | |
1012 | */ | |
1013 | static char *sun4c_lockarea(char *vaddr, unsigned long size) | |
1014 | { | |
1015 | unsigned long base, scan; | |
1016 | unsigned long npages; | |
1017 | unsigned long vpage; | |
1018 | unsigned long pte; | |
1019 | unsigned long apage; | |
1020 | unsigned long high; | |
1021 | unsigned long flags; | |
1022 | ||
1023 | npages = (((unsigned long)vaddr & ~PAGE_MASK) + | |
1024 | size + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
1025 | ||
1da177e4 | 1026 | local_irq_save(flags); |
e756fd80 AM |
1027 | base = bitmap_find_next_zero_area(sun4c_iobuffer_map, iobuffer_map_size, |
1028 | 0, npages, 0); | |
1029 | if (base >= iobuffer_map_size) | |
1030 | goto abend; | |
1da177e4 | 1031 | |
1da177e4 LT |
1032 | high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start; |
1033 | high = SUN4C_REAL_PGDIR_ALIGN(high); | |
1034 | while (high > sun4c_iobuffer_high) { | |
1035 | get_locked_segment(sun4c_iobuffer_high); | |
1036 | sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE; | |
1037 | } | |
1038 | ||
1039 | vpage = ((unsigned long) vaddr) & PAGE_MASK; | |
1040 | for (scan = base; scan < base+npages; scan++) { | |
1041 | pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT); | |
1042 | pte |= pgprot_val(SUN4C_PAGE_KERNEL); | |
1043 | pte |= _SUN4C_PAGE_NOCACHE; | |
1044 | set_bit(scan, sun4c_iobuffer_map); | |
1045 | apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start; | |
1046 | ||
1047 | /* Flush original mapping so we see the right things later. */ | |
1048 | sun4c_flush_page(vpage); | |
1049 | ||
1050 | sun4c_put_pte(apage, pte); | |
1051 | vpage += PAGE_SIZE; | |
1052 | } | |
1053 | local_irq_restore(flags); | |
1054 | return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start + | |
1055 | (((unsigned long) vaddr) & ~PAGE_MASK)); | |
1056 | ||
1057 | abend: | |
1058 | local_irq_restore(flags); | |
1059 | printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size); | |
1060 | panic("Out of iobuffer table"); | |
1061 | return NULL; | |
1062 | } | |
1063 | ||
1064 | static void sun4c_unlockarea(char *vaddr, unsigned long size) | |
1065 | { | |
1066 | unsigned long vpage, npages; | |
1067 | unsigned long flags; | |
1068 | int scan, high; | |
1069 | ||
1070 | vpage = (unsigned long)vaddr & PAGE_MASK; | |
1071 | npages = (((unsigned long)vaddr & ~PAGE_MASK) + | |
1072 | size + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
1073 | ||
1074 | local_irq_save(flags); | |
1075 | while (npages != 0) { | |
1076 | --npages; | |
1077 | ||
1078 | /* This mapping is marked non-cachable, no flush necessary. */ | |
1079 | sun4c_put_pte(vpage, 0); | |
1080 | clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT, | |
1081 | sun4c_iobuffer_map); | |
1082 | vpage += PAGE_SIZE; | |
1083 | } | |
1084 | ||
1085 | /* garbage collect */ | |
1086 | scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT; | |
1087 | while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5]) | |
1088 | scan -= 32; | |
1089 | scan += 32; | |
1090 | high = sun4c_iobuffer_start + (scan << PAGE_SHIFT); | |
1091 | high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE; | |
1092 | while (high < sun4c_iobuffer_high) { | |
1093 | sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE; | |
1094 | free_locked_segment(sun4c_iobuffer_high); | |
1095 | } | |
1096 | local_irq_restore(flags); | |
1097 | } | |
1098 | ||
1099 | /* Note the scsi code at init time passes to here buffers | |
1100 | * which sit on the kernel stack, those are already locked | |
1101 | * by implication and fool the page locking code above | |
1102 | * if passed to by mistake. | |
1103 | */ | |
9723f38e | 1104 | static __u32 sun4c_get_scsi_one(struct device *dev, char *bufptr, unsigned long len) |
1da177e4 LT |
1105 | { |
1106 | unsigned long page; | |
1107 | ||
1108 | page = ((unsigned long)bufptr) & PAGE_MASK; | |
1109 | if (!virt_addr_valid(page)) { | |
1110 | sun4c_flush_page(page); | |
1111 | return (__u32)bufptr; /* already locked */ | |
1112 | } | |
1113 | return (__u32)sun4c_lockarea(bufptr, len); | |
1114 | } | |
1115 | ||
9723f38e | 1116 | static void sun4c_get_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz) |
1da177e4 LT |
1117 | { |
1118 | while (sz != 0) { | |
1119 | --sz; | |
aa83a26a RR |
1120 | sg->dma_address = (__u32)sun4c_lockarea(sg_virt(sg), sg->length); |
1121 | sg->dma_length = sg->length; | |
0912a5db | 1122 | sg = sg_next(sg); |
1da177e4 LT |
1123 | } |
1124 | } | |
1125 | ||
9723f38e | 1126 | static void sun4c_release_scsi_one(struct device *dev, __u32 bufptr, unsigned long len) |
1da177e4 LT |
1127 | { |
1128 | if (bufptr < sun4c_iobuffer_start) | |
1129 | return; /* On kernel stack or similar, see above */ | |
1130 | sun4c_unlockarea((char *)bufptr, len); | |
1131 | } | |
1132 | ||
9723f38e | 1133 | static void sun4c_release_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz) |
1da177e4 LT |
1134 | { |
1135 | while (sz != 0) { | |
1136 | --sz; | |
aa83a26a | 1137 | sun4c_unlockarea((char *)sg->dma_address, sg->length); |
0912a5db | 1138 | sg = sg_next(sg); |
1da177e4 LT |
1139 | } |
1140 | } | |
1141 | ||
1142 | #define TASK_ENTRY_SIZE BUCKET_SIZE /* see above */ | |
1143 | #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1)) | |
1144 | ||
1145 | struct vm_area_struct sun4c_kstack_vma; | |
1146 | ||
1147 | static void __init sun4c_init_lock_areas(void) | |
1148 | { | |
1149 | unsigned long sun4c_taskstack_start; | |
1150 | unsigned long sun4c_taskstack_end; | |
1151 | int bitmap_size; | |
1152 | ||
1153 | sun4c_init_buckets(); | |
1154 | sun4c_taskstack_start = SUN4C_LOCK_VADDR; | |
1155 | sun4c_taskstack_end = (sun4c_taskstack_start + | |
1156 | (TASK_ENTRY_SIZE * NR_TASK_BUCKETS)); | |
1157 | if (sun4c_taskstack_end >= SUN4C_LOCK_END) { | |
1158 | prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n"); | |
1159 | prom_halt(); | |
1160 | } | |
1161 | ||
1162 | sun4c_iobuffer_start = sun4c_iobuffer_high = | |
1163 | SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end); | |
1164 | sun4c_iobuffer_end = SUN4C_LOCK_END; | |
1165 | bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT; | |
1166 | bitmap_size = (bitmap_size + 7) >> 3; | |
1167 | bitmap_size = LONG_ALIGN(bitmap_size); | |
1168 | iobuffer_map_size = bitmap_size << 3; | |
1169 | sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL); | |
1170 | memset((void *) sun4c_iobuffer_map, 0, bitmap_size); | |
1171 | ||
1172 | sun4c_kstack_vma.vm_mm = &init_mm; | |
1173 | sun4c_kstack_vma.vm_start = sun4c_taskstack_start; | |
1174 | sun4c_kstack_vma.vm_end = sun4c_taskstack_end; | |
1175 | sun4c_kstack_vma.vm_page_prot = PAGE_SHARED; | |
1176 | sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC; | |
1177 | insert_vm_struct(&init_mm, &sun4c_kstack_vma); | |
1178 | } | |
1179 | ||
1180 | /* Cache flushing on the sun4c. */ | |
1181 | static void sun4c_flush_cache_all(void) | |
1182 | { | |
1183 | unsigned long begin, end; | |
1184 | ||
1185 | flush_user_windows(); | |
1186 | begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE); | |
1187 | end = (begin + SUN4C_VAC_SIZE); | |
1188 | ||
1189 | if (sun4c_vacinfo.linesize == 32) { | |
1190 | while (begin < end) { | |
1191 | __asm__ __volatile__( | |
1192 | "ld [%0 + 0x00], %%g0\n\t" | |
1193 | "ld [%0 + 0x20], %%g0\n\t" | |
1194 | "ld [%0 + 0x40], %%g0\n\t" | |
1195 | "ld [%0 + 0x60], %%g0\n\t" | |
1196 | "ld [%0 + 0x80], %%g0\n\t" | |
1197 | "ld [%0 + 0xa0], %%g0\n\t" | |
1198 | "ld [%0 + 0xc0], %%g0\n\t" | |
1199 | "ld [%0 + 0xe0], %%g0\n\t" | |
1200 | "ld [%0 + 0x100], %%g0\n\t" | |
1201 | "ld [%0 + 0x120], %%g0\n\t" | |
1202 | "ld [%0 + 0x140], %%g0\n\t" | |
1203 | "ld [%0 + 0x160], %%g0\n\t" | |
1204 | "ld [%0 + 0x180], %%g0\n\t" | |
1205 | "ld [%0 + 0x1a0], %%g0\n\t" | |
1206 | "ld [%0 + 0x1c0], %%g0\n\t" | |
1207 | "ld [%0 + 0x1e0], %%g0\n" | |
1208 | : : "r" (begin)); | |
1209 | begin += 512; | |
1210 | } | |
1211 | } else { | |
1212 | while (begin < end) { | |
1213 | __asm__ __volatile__( | |
1214 | "ld [%0 + 0x00], %%g0\n\t" | |
1215 | "ld [%0 + 0x10], %%g0\n\t" | |
1216 | "ld [%0 + 0x20], %%g0\n\t" | |
1217 | "ld [%0 + 0x30], %%g0\n\t" | |
1218 | "ld [%0 + 0x40], %%g0\n\t" | |
1219 | "ld [%0 + 0x50], %%g0\n\t" | |
1220 | "ld [%0 + 0x60], %%g0\n\t" | |
1221 | "ld [%0 + 0x70], %%g0\n\t" | |
1222 | "ld [%0 + 0x80], %%g0\n\t" | |
1223 | "ld [%0 + 0x90], %%g0\n\t" | |
1224 | "ld [%0 + 0xa0], %%g0\n\t" | |
1225 | "ld [%0 + 0xb0], %%g0\n\t" | |
1226 | "ld [%0 + 0xc0], %%g0\n\t" | |
1227 | "ld [%0 + 0xd0], %%g0\n\t" | |
1228 | "ld [%0 + 0xe0], %%g0\n\t" | |
1229 | "ld [%0 + 0xf0], %%g0\n" | |
1230 | : : "r" (begin)); | |
1231 | begin += 256; | |
1232 | } | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | static void sun4c_flush_cache_mm(struct mm_struct *mm) | |
1237 | { | |
1238 | int new_ctx = mm->context; | |
1239 | ||
1240 | if (new_ctx != NO_CONTEXT) { | |
1241 | flush_user_windows(); | |
1242 | ||
1243 | if (sun4c_context_ring[new_ctx].num_entries) { | |
1244 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1245 | unsigned long flags; | |
1246 | ||
1247 | local_irq_save(flags); | |
1248 | if (head->next != head) { | |
1249 | struct sun4c_mmu_entry *entry = head->next; | |
1250 | int savectx = sun4c_get_context(); | |
1251 | ||
1252 | sun4c_set_context(new_ctx); | |
1253 | sun4c_flush_context(); | |
1254 | do { | |
1255 | struct sun4c_mmu_entry *next = entry->next; | |
1256 | ||
1257 | sun4c_user_unmap(entry); | |
1258 | free_user_entry(new_ctx, entry); | |
1259 | ||
1260 | entry = next; | |
1261 | } while (entry != head); | |
1262 | sun4c_set_context(savectx); | |
1263 | } | |
1264 | local_irq_restore(flags); | |
1265 | } | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
1270 | { | |
1271 | struct mm_struct *mm = vma->vm_mm; | |
1272 | int new_ctx = mm->context; | |
1273 | ||
1274 | if (new_ctx != NO_CONTEXT) { | |
1275 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1276 | struct sun4c_mmu_entry *entry; | |
1277 | unsigned long flags; | |
1278 | ||
1279 | flush_user_windows(); | |
1280 | ||
1281 | local_irq_save(flags); | |
1282 | /* All user segmap chains are ordered on entry->vaddr. */ | |
1283 | for (entry = head->next; | |
1284 | (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); | |
1285 | entry = entry->next) | |
1286 | ; | |
1287 | ||
1288 | /* Tracing various job mixtures showed that this conditional | |
1289 | * only passes ~35% of the time for most worse case situations, | |
1290 | * therefore we avoid all of this gross overhead ~65% of the time. | |
1291 | */ | |
1292 | if ((entry != head) && (entry->vaddr < end)) { | |
1293 | int octx = sun4c_get_context(); | |
1294 | sun4c_set_context(new_ctx); | |
1295 | ||
1296 | /* At this point, always, (start >= entry->vaddr) and | |
1297 | * (entry->vaddr < end), once the latter condition | |
1298 | * ceases to hold, or we hit the end of the list, we | |
1299 | * exit the loop. The ordering of all user allocated | |
1300 | * segmaps makes this all work out so beautifully. | |
1301 | */ | |
1302 | do { | |
1303 | struct sun4c_mmu_entry *next = entry->next; | |
1304 | unsigned long realend; | |
1305 | ||
1306 | /* "realstart" is always >= entry->vaddr */ | |
1307 | realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE; | |
1308 | if (end < realend) | |
1309 | realend = end; | |
1310 | if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) { | |
1311 | unsigned long page = entry->vaddr; | |
1312 | while (page < realend) { | |
1313 | sun4c_flush_page(page); | |
1314 | page += PAGE_SIZE; | |
1315 | } | |
1316 | } else { | |
1317 | sun4c_flush_segment(entry->vaddr); | |
1318 | sun4c_user_unmap(entry); | |
1319 | free_user_entry(new_ctx, entry); | |
1320 | } | |
1321 | entry = next; | |
1322 | } while ((entry != head) && (entry->vaddr < end)); | |
1323 | sun4c_set_context(octx); | |
1324 | } | |
1325 | local_irq_restore(flags); | |
1326 | } | |
1327 | } | |
1328 | ||
1329 | static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page) | |
1330 | { | |
1331 | struct mm_struct *mm = vma->vm_mm; | |
1332 | int new_ctx = mm->context; | |
1333 | ||
1334 | /* Sun4c has no separate I/D caches so cannot optimize for non | |
1335 | * text page flushes. | |
1336 | */ | |
1337 | if (new_ctx != NO_CONTEXT) { | |
1338 | int octx = sun4c_get_context(); | |
1339 | unsigned long flags; | |
1340 | ||
1341 | flush_user_windows(); | |
1342 | local_irq_save(flags); | |
1343 | sun4c_set_context(new_ctx); | |
1344 | sun4c_flush_page(page); | |
1345 | sun4c_set_context(octx); | |
1346 | local_irq_restore(flags); | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | static void sun4c_flush_page_to_ram(unsigned long page) | |
1351 | { | |
1352 | unsigned long flags; | |
1353 | ||
1354 | local_irq_save(flags); | |
1355 | sun4c_flush_page(page); | |
1356 | local_irq_restore(flags); | |
1357 | } | |
1358 | ||
1359 | /* Sun4c cache is unified, both instructions and data live there, so | |
1360 | * no need to flush the on-stack instructions for new signal handlers. | |
1361 | */ | |
1362 | static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) | |
1363 | { | |
1364 | } | |
1365 | ||
1366 | /* TLB flushing on the sun4c. These routines count on the cache | |
1367 | * flushing code to flush the user register windows so that we need | |
1368 | * not do so when we get here. | |
1369 | */ | |
1370 | ||
1371 | static void sun4c_flush_tlb_all(void) | |
1372 | { | |
1373 | struct sun4c_mmu_entry *this_entry, *next_entry; | |
1374 | unsigned long flags; | |
1375 | int savectx, ctx; | |
1376 | ||
1377 | local_irq_save(flags); | |
1378 | this_entry = sun4c_kernel_ring.ringhd.next; | |
1379 | savectx = sun4c_get_context(); | |
1380 | flush_user_windows(); | |
1381 | while (sun4c_kernel_ring.num_entries) { | |
1382 | next_entry = this_entry->next; | |
1383 | sun4c_flush_segment(this_entry->vaddr); | |
1384 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
1385 | sun4c_set_context(ctx); | |
1386 | sun4c_put_segmap(this_entry->vaddr, invalid_segment); | |
1387 | } | |
1388 | free_kernel_entry(this_entry, &sun4c_kernel_ring); | |
1389 | this_entry = next_entry; | |
1390 | } | |
1391 | sun4c_set_context(savectx); | |
1392 | local_irq_restore(flags); | |
1393 | } | |
1394 | ||
1395 | static void sun4c_flush_tlb_mm(struct mm_struct *mm) | |
1396 | { | |
1397 | int new_ctx = mm->context; | |
1398 | ||
1399 | if (new_ctx != NO_CONTEXT) { | |
1400 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1401 | unsigned long flags; | |
1402 | ||
1403 | local_irq_save(flags); | |
1404 | if (head->next != head) { | |
1405 | struct sun4c_mmu_entry *entry = head->next; | |
1406 | int savectx = sun4c_get_context(); | |
1407 | ||
1408 | sun4c_set_context(new_ctx); | |
1409 | sun4c_flush_context(); | |
1410 | do { | |
1411 | struct sun4c_mmu_entry *next = entry->next; | |
1412 | ||
1413 | sun4c_user_unmap(entry); | |
1414 | free_user_entry(new_ctx, entry); | |
1415 | ||
1416 | entry = next; | |
1417 | } while (entry != head); | |
1418 | sun4c_set_context(savectx); | |
1419 | } | |
1420 | local_irq_restore(flags); | |
1421 | } | |
1422 | } | |
1423 | ||
1424 | static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
1425 | { | |
1426 | struct mm_struct *mm = vma->vm_mm; | |
1427 | int new_ctx = mm->context; | |
1428 | ||
1429 | if (new_ctx != NO_CONTEXT) { | |
1430 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1431 | struct sun4c_mmu_entry *entry; | |
1432 | unsigned long flags; | |
1433 | ||
1434 | local_irq_save(flags); | |
1435 | /* See commentary in sun4c_flush_cache_range(). */ | |
1436 | for (entry = head->next; | |
1437 | (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); | |
1438 | entry = entry->next) | |
1439 | ; | |
1440 | ||
1441 | if ((entry != head) && (entry->vaddr < end)) { | |
1442 | int octx = sun4c_get_context(); | |
1443 | ||
1444 | sun4c_set_context(new_ctx); | |
1445 | do { | |
1446 | struct sun4c_mmu_entry *next = entry->next; | |
1447 | ||
1448 | sun4c_flush_segment(entry->vaddr); | |
1449 | sun4c_user_unmap(entry); | |
1450 | free_user_entry(new_ctx, entry); | |
1451 | ||
1452 | entry = next; | |
1453 | } while ((entry != head) && (entry->vaddr < end)); | |
1454 | sun4c_set_context(octx); | |
1455 | } | |
1456 | local_irq_restore(flags); | |
1457 | } | |
1458 | } | |
1459 | ||
1460 | static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) | |
1461 | { | |
1462 | struct mm_struct *mm = vma->vm_mm; | |
1463 | int new_ctx = mm->context; | |
1464 | ||
1465 | if (new_ctx != NO_CONTEXT) { | |
1466 | int savectx = sun4c_get_context(); | |
1467 | unsigned long flags; | |
1468 | ||
1469 | local_irq_save(flags); | |
1470 | sun4c_set_context(new_ctx); | |
1471 | page &= PAGE_MASK; | |
1472 | sun4c_flush_page(page); | |
1473 | sun4c_put_pte(page, 0); | |
1474 | sun4c_set_context(savectx); | |
1475 | local_irq_restore(flags); | |
1476 | } | |
1477 | } | |
1478 | ||
1479 | static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr) | |
1480 | { | |
14778d90 DM |
1481 | unsigned long page_entry, pg_iobits; |
1482 | ||
1483 | pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE | | |
1484 | _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE; | |
1da177e4 LT |
1485 | |
1486 | page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK); | |
1487 | page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT)); | |
1488 | sun4c_put_pte(virt_addr, page_entry); | |
1489 | } | |
1490 | ||
1491 | static void sun4c_mapiorange(unsigned int bus, unsigned long xpa, | |
1492 | unsigned long xva, unsigned int len) | |
1493 | { | |
1494 | while (len != 0) { | |
1495 | len -= PAGE_SIZE; | |
1496 | sun4c_mapioaddr(xpa, xva); | |
1497 | xva += PAGE_SIZE; | |
1498 | xpa += PAGE_SIZE; | |
1499 | } | |
1500 | } | |
1501 | ||
1502 | static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len) | |
1503 | { | |
1504 | while (len != 0) { | |
1505 | len -= PAGE_SIZE; | |
1506 | sun4c_put_pte(virt_addr, 0); | |
1507 | virt_addr += PAGE_SIZE; | |
1508 | } | |
1509 | } | |
1510 | ||
1511 | static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm) | |
1512 | { | |
1513 | struct ctx_list *ctxp; | |
1514 | ||
1515 | ctxp = ctx_free.next; | |
1516 | if (ctxp != &ctx_free) { | |
1517 | remove_from_ctx_list(ctxp); | |
1518 | add_to_used_ctxlist(ctxp); | |
1519 | mm->context = ctxp->ctx_number; | |
1520 | ctxp->ctx_mm = mm; | |
1521 | return; | |
1522 | } | |
1523 | ctxp = ctx_used.next; | |
1524 | if (ctxp->ctx_mm == old_mm) | |
1525 | ctxp = ctxp->next; | |
1526 | remove_from_ctx_list(ctxp); | |
1527 | add_to_used_ctxlist(ctxp); | |
1528 | ctxp->ctx_mm->context = NO_CONTEXT; | |
1529 | ctxp->ctx_mm = mm; | |
1530 | mm->context = ctxp->ctx_number; | |
1531 | sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number], | |
1532 | ctxp->ctx_number); | |
1533 | } | |
1534 | ||
1535 | /* Switch the current MM context. */ | |
1536 | static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu) | |
1537 | { | |
1538 | struct ctx_list *ctx; | |
1539 | int dirty = 0; | |
1540 | ||
1541 | if (mm->context == NO_CONTEXT) { | |
1542 | dirty = 1; | |
1543 | sun4c_alloc_context(old_mm, mm); | |
1544 | } else { | |
1545 | /* Update the LRU ring of contexts. */ | |
1546 | ctx = ctx_list_pool + mm->context; | |
1547 | remove_from_ctx_list(ctx); | |
1548 | add_to_used_ctxlist(ctx); | |
1549 | } | |
1550 | if (dirty || old_mm != mm) | |
1551 | sun4c_set_context(mm->context); | |
1552 | } | |
1553 | ||
1554 | static void sun4c_destroy_context(struct mm_struct *mm) | |
1555 | { | |
1556 | struct ctx_list *ctx_old; | |
1557 | ||
1558 | if (mm->context != NO_CONTEXT) { | |
1559 | sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context); | |
1560 | ctx_old = ctx_list_pool + mm->context; | |
1561 | remove_from_ctx_list(ctx_old); | |
1562 | add_to_free_ctxlist(ctx_old); | |
1563 | mm->context = NO_CONTEXT; | |
1564 | } | |
1565 | } | |
1566 | ||
1567 | static void sun4c_mmu_info(struct seq_file *m) | |
1568 | { | |
1569 | int used_user_entries, i; | |
1570 | ||
1571 | used_user_entries = 0; | |
1572 | for (i = 0; i < num_contexts; i++) | |
1573 | used_user_entries += sun4c_context_ring[i].num_entries; | |
1574 | ||
1575 | seq_printf(m, | |
1576 | "vacsize\t\t: %d bytes\n" | |
1577 | "vachwflush\t: %s\n" | |
1578 | "vaclinesize\t: %d bytes\n" | |
1579 | "mmuctxs\t\t: %d\n" | |
1580 | "mmupsegs\t: %d\n" | |
1581 | "kernelpsegs\t: %d\n" | |
1582 | "kfreepsegs\t: %d\n" | |
1583 | "usedpsegs\t: %d\n" | |
1584 | "ufreepsegs\t: %d\n" | |
1585 | "user_taken\t: %d\n" | |
1586 | "max_taken\t: %d\n", | |
1587 | sun4c_vacinfo.num_bytes, | |
1588 | (sun4c_vacinfo.do_hwflushes ? "yes" : "no"), | |
1589 | sun4c_vacinfo.linesize, | |
1590 | num_contexts, | |
1591 | (invalid_segment + 1), | |
1592 | sun4c_kernel_ring.num_entries, | |
1593 | sun4c_kfree_ring.num_entries, | |
1594 | used_user_entries, | |
1595 | sun4c_ufree_ring.num_entries, | |
1596 | sun4c_user_taken_entries, | |
1597 | max_user_taken_entries); | |
1598 | } | |
1599 | ||
1600 | /* Nothing below here should touch the mmu hardware nor the mmu_entry | |
1601 | * data structures. | |
1602 | */ | |
1603 | ||
1604 | /* First the functions which the mid-level code uses to directly | |
1605 | * manipulate the software page tables. Some defines since we are | |
1606 | * emulating the i386 page directory layout. | |
1607 | */ | |
1608 | #define PGD_PRESENT 0x001 | |
1609 | #define PGD_RW 0x002 | |
1610 | #define PGD_USER 0x004 | |
1611 | #define PGD_ACCESSED 0x020 | |
1612 | #define PGD_DIRTY 0x040 | |
1613 | #define PGD_TABLE (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY) | |
1614 | ||
1615 | static void sun4c_set_pte(pte_t *ptep, pte_t pte) | |
1616 | { | |
1617 | *ptep = pte; | |
1618 | } | |
1619 | ||
1620 | static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp) | |
1621 | { | |
1622 | } | |
1623 | ||
1624 | static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep) | |
1625 | { | |
1626 | pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep; | |
1627 | } | |
1628 | ||
1629 | static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep) | |
1630 | { | |
1631 | if (page_address(ptep) == NULL) BUG(); /* No highmem on sun4c */ | |
1632 | pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep); | |
1633 | } | |
1634 | ||
1635 | static int sun4c_pte_present(pte_t pte) | |
1636 | { | |
1637 | return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0); | |
1638 | } | |
1639 | static void sun4c_pte_clear(pte_t *ptep) { *ptep = __pte(0); } | |
1640 | ||
1da177e4 LT |
1641 | static int sun4c_pmd_bad(pmd_t pmd) |
1642 | { | |
1643 | return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) || | |
1644 | (!virt_addr_valid(pmd_val(pmd)))); | |
1645 | } | |
1646 | ||
1647 | static int sun4c_pmd_present(pmd_t pmd) | |
1648 | { | |
1649 | return ((pmd_val(pmd) & PGD_PRESENT) != 0); | |
1650 | } | |
1651 | ||
1652 | #if 0 /* if PMD takes one word */ | |
1653 | static void sun4c_pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); } | |
1654 | #else /* if pmd_t is a longish aggregate */ | |
1655 | static void sun4c_pmd_clear(pmd_t *pmdp) { | |
1656 | memset((void *)pmdp, 0, sizeof(pmd_t)); | |
1657 | } | |
1658 | #endif | |
1659 | ||
1660 | static int sun4c_pgd_none(pgd_t pgd) { return 0; } | |
1661 | static int sun4c_pgd_bad(pgd_t pgd) { return 0; } | |
1662 | static int sun4c_pgd_present(pgd_t pgd) { return 1; } | |
1663 | static void sun4c_pgd_clear(pgd_t * pgdp) { } | |
1664 | ||
1665 | /* | |
1666 | * The following only work if pte_present() is true. | |
1667 | * Undefined behaviour if not.. | |
1668 | */ | |
1669 | static pte_t sun4c_pte_mkwrite(pte_t pte) | |
1670 | { | |
1671 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE); | |
1672 | if (pte_val(pte) & _SUN4C_PAGE_MODIFIED) | |
1673 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); | |
1674 | return pte; | |
1675 | } | |
1676 | ||
1677 | static pte_t sun4c_pte_mkdirty(pte_t pte) | |
1678 | { | |
1679 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED); | |
1680 | if (pte_val(pte) & _SUN4C_PAGE_WRITE) | |
1681 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); | |
1682 | return pte; | |
1683 | } | |
1684 | ||
1685 | static pte_t sun4c_pte_mkyoung(pte_t pte) | |
1686 | { | |
1687 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED); | |
1688 | if (pte_val(pte) & _SUN4C_PAGE_READ) | |
1689 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ); | |
1690 | return pte; | |
1691 | } | |
1692 | ||
1693 | /* | |
1694 | * Conversion functions: convert a page and protection to a page entry, | |
1695 | * and a page entry and page directory to the page they refer to. | |
1696 | */ | |
1697 | static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot) | |
1698 | { | |
1699 | return __pte(page_to_pfn(page) | pgprot_val(pgprot)); | |
1700 | } | |
1701 | ||
1702 | static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot) | |
1703 | { | |
1704 | return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot)); | |
1705 | } | |
1706 | ||
1707 | static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space) | |
1708 | { | |
1709 | return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot)); | |
1710 | } | |
1711 | ||
1712 | static unsigned long sun4c_pte_pfn(pte_t pte) | |
1713 | { | |
1714 | return pte_val(pte) & SUN4C_PFN_MASK; | |
1715 | } | |
1716 | ||
1717 | static pte_t sun4c_pgoff_to_pte(unsigned long pgoff) | |
1718 | { | |
1719 | return __pte(pgoff | _SUN4C_PAGE_FILE); | |
1720 | } | |
1721 | ||
1722 | static unsigned long sun4c_pte_to_pgoff(pte_t pte) | |
1723 | { | |
1724 | return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1); | |
1725 | } | |
1726 | ||
1727 | ||
64d329ee | 1728 | static inline unsigned long sun4c_pmd_page_v(pmd_t pmd) |
1da177e4 LT |
1729 | { |
1730 | return (pmd_val(pmd) & PAGE_MASK); | |
1731 | } | |
1732 | ||
1733 | static struct page *sun4c_pmd_page(pmd_t pmd) | |
1734 | { | |
1735 | return virt_to_page(sun4c_pmd_page_v(pmd)); | |
1736 | } | |
1737 | ||
1738 | static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; } | |
1739 | ||
1740 | /* to find an entry in a page-table-directory */ | |
1741 | static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address) | |
1742 | { | |
1743 | return mm->pgd + (address >> SUN4C_PGDIR_SHIFT); | |
1744 | } | |
1745 | ||
1746 | /* Find an entry in the second-level page table.. */ | |
1747 | static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address) | |
1748 | { | |
1749 | return (pmd_t *) dir; | |
1750 | } | |
1751 | ||
1752 | /* Find an entry in the third-level page table.. */ | |
1753 | pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address) | |
1754 | { | |
1755 | return (pte_t *) sun4c_pmd_page_v(*dir) + | |
1756 | ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1)); | |
1757 | } | |
1758 | ||
1759 | static unsigned long sun4c_swp_type(swp_entry_t entry) | |
1760 | { | |
1761 | return (entry.val & SUN4C_SWP_TYPE_MASK); | |
1762 | } | |
1763 | ||
1764 | static unsigned long sun4c_swp_offset(swp_entry_t entry) | |
1765 | { | |
1766 | return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK; | |
1767 | } | |
1768 | ||
1769 | static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset) | |
1770 | { | |
1771 | return (swp_entry_t) { | |
1772 | (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT | |
1773 | | (type & SUN4C_SWP_TYPE_MASK) }; | |
1774 | } | |
1775 | ||
1776 | static void sun4c_free_pte_slow(pte_t *pte) | |
1777 | { | |
1778 | free_page((unsigned long)pte); | |
1779 | } | |
1780 | ||
1781 | static void sun4c_free_pgd_slow(pgd_t *pgd) | |
1782 | { | |
1783 | free_page((unsigned long)pgd); | |
1784 | } | |
1785 | ||
1786 | static pgd_t *sun4c_get_pgd_fast(void) | |
1787 | { | |
1788 | unsigned long *ret; | |
1789 | ||
1790 | if ((ret = pgd_quicklist) != NULL) { | |
1791 | pgd_quicklist = (unsigned long *)(*ret); | |
1792 | ret[0] = ret[1]; | |
1793 | pgtable_cache_size--; | |
1794 | } else { | |
1795 | pgd_t *init; | |
1796 | ||
1797 | ret = (unsigned long *)__get_free_page(GFP_KERNEL); | |
1798 | memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t)); | |
1799 | init = sun4c_pgd_offset(&init_mm, 0); | |
1800 | memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, | |
1801 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); | |
1802 | } | |
1803 | return (pgd_t *)ret; | |
1804 | } | |
1805 | ||
1806 | static void sun4c_free_pgd_fast(pgd_t *pgd) | |
1807 | { | |
1808 | *(unsigned long *)pgd = (unsigned long) pgd_quicklist; | |
1809 | pgd_quicklist = (unsigned long *) pgd; | |
1810 | pgtable_cache_size++; | |
1811 | } | |
1812 | ||
1813 | ||
64d329ee | 1814 | static inline pte_t * |
1da177e4 LT |
1815 | sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address) |
1816 | { | |
1817 | unsigned long *ret; | |
1818 | ||
1819 | if ((ret = (unsigned long *)pte_quicklist) != NULL) { | |
1820 | pte_quicklist = (unsigned long *)(*ret); | |
1821 | ret[0] = ret[1]; | |
1822 | pgtable_cache_size--; | |
1823 | } | |
1824 | return (pte_t *)ret; | |
1825 | } | |
1826 | ||
1827 | static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) | |
1828 | { | |
1829 | pte_t *pte; | |
1830 | ||
1831 | if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL) | |
1832 | return pte; | |
1833 | ||
b3dd5b82 | 1834 | pte = (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); |
1da177e4 LT |
1835 | return pte; |
1836 | } | |
1837 | ||
2f569afd | 1838 | static pgtable_t sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address) |
1da177e4 | 1839 | { |
2f569afd MS |
1840 | pte_t *pte; |
1841 | struct page *page; | |
1842 | ||
1843 | pte = sun4c_pte_alloc_one_kernel(mm, address); | |
1da177e4 LT |
1844 | if (pte == NULL) |
1845 | return NULL; | |
2f569afd MS |
1846 | page = virt_to_page(pte); |
1847 | pgtable_page_ctor(page); | |
1848 | return page; | |
1da177e4 LT |
1849 | } |
1850 | ||
64d329ee | 1851 | static inline void sun4c_free_pte_fast(pte_t *pte) |
1da177e4 LT |
1852 | { |
1853 | *(unsigned long *)pte = (unsigned long) pte_quicklist; | |
1854 | pte_quicklist = (unsigned long *) pte; | |
1855 | pgtable_cache_size++; | |
1856 | } | |
1857 | ||
2f569afd | 1858 | static void sun4c_pte_free(pgtable_t pte) |
1da177e4 | 1859 | { |
2f569afd | 1860 | pgtable_page_dtor(pte); |
1da177e4 LT |
1861 | sun4c_free_pte_fast(page_address(pte)); |
1862 | } | |
1863 | ||
1864 | /* | |
1865 | * allocating and freeing a pmd is trivial: the 1-entry pmd is | |
1866 | * inside the pgd, so has no extra memory associated with it. | |
1867 | */ | |
1868 | static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address) | |
1869 | { | |
1870 | BUG(); | |
1871 | return NULL; | |
1872 | } | |
1873 | ||
1874 | static void sun4c_free_pmd_fast(pmd_t * pmd) { } | |
1875 | ||
1876 | static void sun4c_check_pgt_cache(int low, int high) | |
1877 | { | |
1878 | if (pgtable_cache_size > high) { | |
1879 | do { | |
1880 | if (pgd_quicklist) | |
1881 | sun4c_free_pgd_slow(sun4c_get_pgd_fast()); | |
1882 | if (pte_quicklist) | |
1883 | sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0)); | |
1884 | } while (pgtable_cache_size > low); | |
1885 | } | |
1886 | } | |
1887 | ||
1888 | /* An experiment, turn off by default for now... -DaveM */ | |
1889 | #define SUN4C_PRELOAD_PSEG | |
1890 | ||
4b3073e1 | 1891 | void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) |
1da177e4 LT |
1892 | { |
1893 | unsigned long flags; | |
1894 | int pseg; | |
1895 | ||
da4e9fea MF |
1896 | if (vma->vm_mm->context == NO_CONTEXT) |
1897 | return; | |
1898 | ||
1da177e4 LT |
1899 | local_irq_save(flags); |
1900 | address &= PAGE_MASK; | |
1901 | if ((pseg = sun4c_get_segmap(address)) == invalid_segment) { | |
1902 | struct sun4c_mmu_entry *entry = sun4c_user_strategy(); | |
1903 | struct mm_struct *mm = vma->vm_mm; | |
1904 | unsigned long start, end; | |
1905 | ||
1906 | entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK); | |
1907 | entry->ctx = mm->context; | |
1908 | add_ring_ordered(sun4c_context_ring + mm->context, entry); | |
1909 | sun4c_put_segmap(entry->vaddr, entry->pseg); | |
1910 | end = start + SUN4C_REAL_PGDIR_SIZE; | |
1911 | while (start < end) { | |
1912 | #ifdef SUN4C_PRELOAD_PSEG | |
1913 | pgd_t *pgdp = sun4c_pgd_offset(mm, start); | |
1914 | pte_t *ptep; | |
1915 | ||
1916 | if (!pgdp) | |
1917 | goto no_mapping; | |
1918 | ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start); | |
1919 | if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT)) | |
1920 | goto no_mapping; | |
1921 | sun4c_put_pte(start, pte_val(*ptep)); | |
1922 | goto next; | |
1923 | ||
1924 | no_mapping: | |
1925 | #endif | |
1926 | sun4c_put_pte(start, 0); | |
1927 | #ifdef SUN4C_PRELOAD_PSEG | |
1928 | next: | |
1929 | #endif | |
1930 | start += PAGE_SIZE; | |
1931 | } | |
1932 | #ifndef SUN4C_PRELOAD_PSEG | |
4b3073e1 | 1933 | sun4c_put_pte(address, pte_val(*ptep)); |
1da177e4 LT |
1934 | #endif |
1935 | local_irq_restore(flags); | |
1936 | return; | |
1937 | } else { | |
1938 | struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg]; | |
1939 | ||
1940 | remove_lru(entry); | |
1941 | add_lru(entry); | |
1942 | } | |
1943 | ||
4b3073e1 | 1944 | sun4c_put_pte(address, pte_val(*ptep)); |
1da177e4 LT |
1945 | local_irq_restore(flags); |
1946 | } | |
1947 | ||
1948 | extern void sparc_context_init(int); | |
1da177e4 LT |
1949 | extern unsigned long bootmem_init(unsigned long *pages_avail); |
1950 | extern unsigned long last_valid_pfn; | |
1951 | ||
1952 | void __init sun4c_paging_init(void) | |
1953 | { | |
1954 | int i, cnt; | |
1955 | unsigned long kernel_end, vaddr; | |
1956 | extern struct resource sparc_iomap; | |
1957 | unsigned long end_pfn, pages_avail; | |
1958 | ||
86ed40bd | 1959 | kernel_end = (unsigned long) &_end; |
1da177e4 LT |
1960 | kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end); |
1961 | ||
1962 | pages_avail = 0; | |
1963 | last_valid_pfn = bootmem_init(&pages_avail); | |
1964 | end_pfn = last_valid_pfn; | |
1965 | ||
1966 | sun4c_probe_mmu(); | |
1967 | invalid_segment = (num_segmaps - 1); | |
1968 | sun4c_init_mmu_entry_pool(); | |
1969 | sun4c_init_rings(); | |
1970 | sun4c_init_map_kernelprom(kernel_end); | |
1971 | sun4c_init_clean_mmu(kernel_end); | |
1972 | sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS); | |
1973 | sun4c_init_lock_area(sparc_iomap.start, IOBASE_END); | |
1974 | sun4c_init_lock_area(DVMA_VADDR, DVMA_END); | |
1975 | sun4c_init_lock_areas(); | |
1976 | sun4c_init_fill_user_ring(); | |
1977 | ||
1978 | sun4c_set_context(0); | |
1979 | memset(swapper_pg_dir, 0, PAGE_SIZE); | |
1980 | memset(pg0, 0, PAGE_SIZE); | |
1981 | memset(pg1, 0, PAGE_SIZE); | |
1982 | memset(pg2, 0, PAGE_SIZE); | |
1983 | memset(pg3, 0, PAGE_SIZE); | |
1984 | ||
1985 | /* Save work later. */ | |
1986 | vaddr = VMALLOC_START; | |
1987 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0); | |
1988 | vaddr += SUN4C_PGDIR_SIZE; | |
1989 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1); | |
1990 | vaddr += SUN4C_PGDIR_SIZE; | |
1991 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2); | |
1992 | vaddr += SUN4C_PGDIR_SIZE; | |
1993 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3); | |
1994 | sun4c_init_ss2_cache_bug(); | |
1995 | sparc_context_init(num_contexts); | |
1996 | ||
1997 | { | |
1998 | unsigned long zones_size[MAX_NR_ZONES]; | |
1999 | unsigned long zholes_size[MAX_NR_ZONES]; | |
2000 | unsigned long npages; | |
2001 | int znum; | |
2002 | ||
2003 | for (znum = 0; znum < MAX_NR_ZONES; znum++) | |
2004 | zones_size[znum] = zholes_size[znum] = 0; | |
2005 | ||
2006 | npages = max_low_pfn - pfn_base; | |
2007 | ||
2008 | zones_size[ZONE_DMA] = npages; | |
2009 | zholes_size[ZONE_DMA] = npages - pages_avail; | |
2010 | ||
2011 | npages = highend_pfn - max_low_pfn; | |
2012 | zones_size[ZONE_HIGHMEM] = npages; | |
2013 | zholes_size[ZONE_HIGHMEM] = npages - calc_highpages(); | |
2014 | ||
9109fb7b | 2015 | free_area_init_node(0, zones_size, pfn_base, zholes_size); |
1da177e4 LT |
2016 | } |
2017 | ||
2018 | cnt = 0; | |
2019 | for (i = 0; i < num_segmaps; i++) | |
2020 | if (mmu_entry_pool[i].locked) | |
2021 | cnt++; | |
2022 | ||
2023 | max_user_taken_entries = num_segmaps - cnt - 40 - 1; | |
2024 | ||
2025 | printk("SUN4C: %d mmu entries for the kernel\n", cnt); | |
2026 | } | |
2027 | ||
14778d90 DM |
2028 | static pgprot_t sun4c_pgprot_noncached(pgprot_t prot) |
2029 | { | |
2030 | prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE); | |
2031 | ||
2032 | return prot; | |
2033 | } | |
2034 | ||
1da177e4 LT |
2035 | /* Load up routines and constants for sun4c mmu */ |
2036 | void __init ld_mmu_sun4c(void) | |
2037 | { | |
2038 | extern void ___xchg32_sun4c(void); | |
2039 | ||
2040 | printk("Loading sun4c MMU routines\n"); | |
2041 | ||
2042 | /* First the constants */ | |
2043 | BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT); | |
2044 | BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE); | |
2045 | BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK); | |
2046 | ||
2047 | BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD); | |
2048 | BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD); | |
2049 | BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE); | |
2050 | ||
2051 | BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE)); | |
378e515c | 2052 | PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED); |
1da177e4 LT |
2053 | BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY)); |
2054 | BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY)); | |
2055 | BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL)); | |
2056 | page_kernel = pgprot_val(SUN4C_PAGE_KERNEL); | |
1da177e4 LT |
2057 | |
2058 | /* Functions */ | |
14778d90 | 2059 | BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM); |
1da177e4 LT |
2060 | BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM); |
2061 | BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM); | |
2062 | ||
2063 | BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM); | |
2064 | ||
2065 | if (sun4c_vacinfo.do_hwflushes) { | |
2066 | BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM); | |
2067 | BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM); | |
2068 | BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM); | |
2069 | } else { | |
2070 | BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM); | |
2071 | BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM); | |
2072 | BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM); | |
2073 | } | |
2074 | ||
2075 | BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM); | |
2076 | BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM); | |
2077 | BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM); | |
2078 | BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM); | |
2079 | BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM); | |
2080 | BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM); | |
2081 | BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM); | |
2082 | BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM); | |
2083 | BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM); | |
2084 | BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM); | |
2085 | ||
2086 | BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP); | |
2087 | ||
2088 | BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0); | |
2089 | ||
1da177e4 LT |
2090 | BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM); |
2091 | #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */ | |
2092 | BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1)); | |
2093 | #else | |
2094 | BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM); | |
2095 | #endif | |
2096 | BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM); | |
2097 | BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM); | |
2098 | ||
2099 | BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM); | |
2100 | BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0); | |
1da177e4 LT |
2101 | |
2102 | BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM); | |
2103 | BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM); | |
2104 | BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0); | |
2105 | ||
2106 | BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0)); | |
2107 | BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0)); | |
2108 | BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1)); | |
2109 | BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP); | |
2110 | ||
2111 | BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM); | |
2112 | BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM); | |
2113 | BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM); | |
2114 | ||
2115 | BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK); | |
2116 | BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM); | |
2117 | BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM); | |
2118 | BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM); | |
2119 | BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM); | |
2120 | BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM); | |
2121 | BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM); | |
2122 | BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP); | |
2123 | BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0); | |
2124 | BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM); | |
2125 | BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM); | |
2126 | ||
2127 | BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE); | |
2128 | BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED); | |
2129 | BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED); | |
2130 | BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE); | |
2131 | BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE); | |
2132 | BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE); | |
2133 | BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ); | |
2134 | BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM); | |
2135 | BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM); | |
2136 | BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM); | |
2137 | BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM); | |
2138 | ||
2139 | BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM); | |
2140 | BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM); | |
2141 | ||
2142 | BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM); | |
2143 | BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM); | |
2144 | ||
2145 | BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM); | |
2146 | BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM); | |
2147 | BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM); | |
2148 | BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM); | |
2149 | ||
2150 | BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM); | |
2151 | BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM); | |
1da177e4 LT |
2152 | |
2153 | BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM); | |
2154 | BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM); | |
2155 | ||
2156 | BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM); | |
2157 | BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM); | |
2158 | BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM); | |
2159 | ||
2160 | BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM); | |
2161 | BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM); | |
2162 | ||
2163 | BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM); | |
2164 | ||
2165 | /* These should _never_ get called with two level tables. */ | |
2166 | BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP); | |
46a82b2d | 2167 | BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0); |
1da177e4 | 2168 | } |