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1/*
2 * This file contains the routines setting up the linux page tables.
3 * -- paulus
4 *
5 * Derived from arch/ppc/mm/init.c:
6 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7 *
8 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
9 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
10 * Copyright (C) 1996 Paul Mackerras
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11 *
12 * Derived from "arch/i386/mm/init.c"
13 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 *
20 */
21
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22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/types.h>
25#include <linux/mm.h>
26#include <linux/vmalloc.h>
27#include <linux/init.h>
28#include <linux/highmem.h>
c5df7f77 29#include <linux/lmb.h>
5a0e3ad6 30#include <linux/slab.h>
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31
32#include <asm/pgtable.h>
33#include <asm/pgalloc.h>
2c419bde 34#include <asm/fixmap.h>
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35#include <asm/io.h>
36
37#include "mmu_decl.h"
38
39unsigned long ioremap_base;
40unsigned long ioremap_bot;
920573bd 41EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */
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42
43#if defined(CONFIG_6xx) || defined(CONFIG_POWER3)
44#define HAVE_BATS 1
45#endif
46
47#if defined(CONFIG_FSL_BOOKE)
48#define HAVE_TLBCAM 1
49#endif
50
51extern char etext[], _stext[];
52
14cf11af 53#ifdef HAVE_BATS
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54extern phys_addr_t v_mapped_by_bats(unsigned long va);
55extern unsigned long p_mapped_by_bats(phys_addr_t pa);
56void setbat(int index, unsigned long virt, phys_addr_t phys,
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57 unsigned int size, int flags);
58
59#else /* !HAVE_BATS */
60#define v_mapped_by_bats(x) (0UL)
61#define p_mapped_by_bats(x) (0UL)
62#endif /* HAVE_BATS */
63
64#ifdef HAVE_TLBCAM
65extern unsigned int tlbcam_index;
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66extern phys_addr_t v_mapped_by_tlbcam(unsigned long va);
67extern unsigned long p_mapped_by_tlbcam(phys_addr_t pa);
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68#else /* !HAVE_TLBCAM */
69#define v_mapped_by_tlbcam(x) (0UL)
70#define p_mapped_by_tlbcam(x) (0UL)
71#endif /* HAVE_TLBCAM */
72
ca9153a3 73#define PGDIR_ORDER (32 + PGD_T_LOG2 - PGDIR_SHIFT)
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74
75pgd_t *pgd_alloc(struct mm_struct *mm)
76{
77 pgd_t *ret;
78
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79 /* pgdir take page or two with 4K pages and a page fraction otherwise */
80#ifndef CONFIG_PPC_4K_PAGES
81 ret = (pgd_t *)kzalloc(1 << PGDIR_ORDER, GFP_KERNEL);
82#else
83 ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
84 PGDIR_ORDER - PAGE_SHIFT);
85#endif
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86 return ret;
87}
88
5e541973 89void pgd_free(struct mm_struct *mm, pgd_t *pgd)
14cf11af 90{
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91#ifndef CONFIG_PPC_4K_PAGES
92 kfree((void *)pgd);
93#else
94 free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT);
95#endif
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96}
97
f1aed924 98__init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
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99{
100 pte_t *pte;
101 extern int mem_init_done;
102 extern void *early_get_page(void);
103
104 if (mem_init_done) {
105 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
106 } else {
107 pte = (pte_t *)early_get_page();
108 if (pte)
109 clear_page(pte);
110 }
111 return pte;
112}
113
2f569afd 114pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
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115{
116 struct page *ptepage;
117
2f569afd 118 gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO;
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119
120 ptepage = alloc_pages(flags, 0);
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121 if (!ptepage)
122 return NULL;
123 pgtable_page_ctor(ptepage);
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124 return ptepage;
125}
126
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127void __iomem *
128ioremap(phys_addr_t addr, unsigned long size)
129{
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130 return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED,
131 __builtin_return_address(0));
14cf11af 132}
920573bd 133EXPORT_SYMBOL(ioremap);
14cf11af 134
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135void __iomem *
136ioremap_flags(phys_addr_t addr, unsigned long size, unsigned long flags)
137{
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138 /* writeable implies dirty for kernel addresses */
139 if (flags & _PAGE_RW)
140 flags |= _PAGE_DIRTY | _PAGE_HWWRITE;
141
142 /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
ea3cc330 143 flags &= ~(_PAGE_USER | _PAGE_EXEC);
a1f242ff 144
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145#ifdef _PAGE_BAP_SR
146 /* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format
147 * which means that we just cleared supervisor access... oops ;-) This
148 * restores it
149 */
150 flags |= _PAGE_BAP_SR;
151#endif
152
1cdab55d 153 return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
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154}
155EXPORT_SYMBOL(ioremap_flags);
156
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157void __iomem *
158__ioremap(phys_addr_t addr, unsigned long size, unsigned long flags)
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159{
160 return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
161}
162
163void __iomem *
164__ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
165 void *caller)
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166{
167 unsigned long v, i;
168 phys_addr_t p;
169 int err;
170
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171 /* Make sure we have the base flags */
172 if ((flags & _PAGE_PRESENT) == 0)
8d1cf34e 173 flags |= PAGE_KERNEL;
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174
175 /* Non-cacheable page cannot be coherent */
176 if (flags & _PAGE_NO_CACHE)
177 flags &= ~_PAGE_COHERENT;
178
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179 /*
180 * Choose an address to map it to.
181 * Once the vmalloc system is running, we use it.
182 * Before then, we use space going down from ioremap_base
183 * (ioremap_bot records where we're up to).
184 */
185 p = addr & PAGE_MASK;
186 size = PAGE_ALIGN(addr + size) - p;
187
188 /*
189 * If the address lies within the first 16 MB, assume it's in ISA
190 * memory space
191 */
192 if (p < 16*1024*1024)
193 p += _ISA_MEM_BASE;
194
01695a96 195#ifndef CONFIG_CRASH_DUMP
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196 /*
197 * Don't allow anybody to remap normal RAM that we're using.
198 * mem_init() sets high_memory so only do the check after that.
199 */
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200 if (mem_init_done && (p < virt_to_phys(high_memory)) &&
201 !(__allow_ioremap_reserved && lmb_is_region_reserved(p, size))) {
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202 printk("__ioremap(): phys addr 0x%llx is RAM lr %p\n",
203 (unsigned long long)p, __builtin_return_address(0));
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204 return NULL;
205 }
01695a96 206#endif
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207
208 if (size == 0)
209 return NULL;
210
211 /*
212 * Is it already mapped? Perhaps overlapped by a previous
213 * BAT mapping. If the whole area is mapped then we're done,
214 * otherwise remap it since we want to keep the virt addrs for
215 * each request contiguous.
216 *
217 * We make the assumption here that if the bottom and top
218 * of the range we want are mapped then it's mapped to the
219 * same virt address (and this is contiguous).
220 * -- Cort
221 */
222 if ((v = p_mapped_by_bats(p)) /*&& p_mapped_by_bats(p+size-1)*/ )
223 goto out;
224
225 if ((v = p_mapped_by_tlbcam(p)))
226 goto out;
227
228 if (mem_init_done) {
229 struct vm_struct *area;
1cdab55d 230 area = get_vm_area_caller(size, VM_IOREMAP, caller);
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231 if (area == 0)
232 return NULL;
233 v = (unsigned long) area->addr;
234 } else {
235 v = (ioremap_bot -= size);
236 }
237
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238 /*
239 * Should check if it is a candidate for a BAT mapping
240 */
241
242 err = 0;
243 for (i = 0; i < size && err == 0; i += PAGE_SIZE)
244 err = map_page(v+i, p+i, flags);
245 if (err) {
246 if (mem_init_done)
247 vunmap((void *)v);
248 return NULL;
249 }
250
251out:
252 return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
253}
920573bd 254EXPORT_SYMBOL(__ioremap);
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255
256void iounmap(volatile void __iomem *addr)
257{
258 /*
259 * If mapped by BATs then there is nothing to do.
260 * Calling vfree() generates a benign warning.
261 */
262 if (v_mapped_by_bats((unsigned long)addr)) return;
263
264 if (addr > high_memory && (unsigned long) addr < ioremap_bot)
265 vunmap((void *) (PAGE_MASK & (unsigned long)addr));
266}
920573bd 267EXPORT_SYMBOL(iounmap);
14cf11af 268
68a64357 269int map_page(unsigned long va, phys_addr_t pa, int flags)
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270{
271 pmd_t *pd;
272 pte_t *pg;
273 int err = -ENOMEM;
274
14cf11af 275 /* Use upper 10 bits of VA to index the first level map */
d1953c88 276 pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va);
14cf11af 277 /* Use middle 10 bits of VA to index the second-level map */
e2f2e58e 278 pg = pte_alloc_kernel(pd, va);
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279 if (pg != 0) {
280 err = 0;
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281 /* The PTE should never be already set nor present in the
282 * hash table
283 */
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284 BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) &&
285 flags);
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286 set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
287 __pgprot(flags)));
14cf11af 288 }
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289 return err;
290}
291
292/*
de32400d 293 * Map in a chunk of physical memory starting at start.
14cf11af 294 */
de32400d 295void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
14cf11af 296{
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297 unsigned long v, s, f;
298 phys_addr_t p;
ee4f2ea4 299 int ktext;
14cf11af 300
de32400d 301 s = offset;
ccdcef72 302 v = PAGE_OFFSET + s;
99c62dd7 303 p = memstart_addr + s;
de32400d 304 for (; s < top; s += PAGE_SIZE) {
ee4f2ea4 305 ktext = ((char *) v >= _stext && (char *) v < etext);
8d1cf34e 306 f = ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL;
14cf11af 307 map_page(v, p, f);
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308#ifdef CONFIG_PPC_STD_MMU_32
309 if (ktext)
310 hash_preload(&init_mm, v, 0, 0x300);
311#endif
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312 v += PAGE_SIZE;
313 p += PAGE_SIZE;
314 }
315}
316
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317void __init mapin_ram(void)
318{
319 unsigned long s, top;
320
321#ifndef CONFIG_WII
322 top = total_lowmem;
323 s = mmu_mapin_ram(top);
324 __mapin_ram_chunk(s, top);
325#else
326 if (!wii_hole_size) {
327 s = mmu_mapin_ram(total_lowmem);
328 __mapin_ram_chunk(s, total_lowmem);
329 } else {
330 top = wii_hole_start;
331 s = mmu_mapin_ram(top);
332 __mapin_ram_chunk(s, top);
333
334 top = lmb_end_of_DRAM();
335 s = wii_mmu_mapin_mem2(top);
336 __mapin_ram_chunk(s, top);
337 }
338#endif
339}
340
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341/* Scan the real Linux page tables and return a PTE pointer for
342 * a virtual address in a context.
343 * Returns true (1) if PTE was found, zero otherwise. The pointer to
344 * the PTE pointer is unmodified if PTE is not found.
345 */
346int
bab70a4a 347get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp)
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348{
349 pgd_t *pgd;
d1953c88 350 pud_t *pud;
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351 pmd_t *pmd;
352 pte_t *pte;
353 int retval = 0;
354
355 pgd = pgd_offset(mm, addr & PAGE_MASK);
356 if (pgd) {
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357 pud = pud_offset(pgd, addr & PAGE_MASK);
358 if (pud && pud_present(*pud)) {
359 pmd = pmd_offset(pud, addr & PAGE_MASK);
360 if (pmd_present(*pmd)) {
361 pte = pte_offset_map(pmd, addr & PAGE_MASK);
362 if (pte) {
363 retval = 1;
364 *ptep = pte;
365 if (pmdp)
366 *pmdp = pmd;
367 /* XXX caller needs to do pte_unmap, yuck */
368 }
369 }
370 }
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371 }
372 return(retval);
373}
374
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375#ifdef CONFIG_DEBUG_PAGEALLOC
376
377static int __change_page_attr(struct page *page, pgprot_t prot)
378{
379 pte_t *kpte;
380 pmd_t *kpmd;
381 unsigned long address;
382
383 BUG_ON(PageHighMem(page));
384 address = (unsigned long)page_address(page);
385
386 if (v_mapped_by_bats(address) || v_mapped_by_tlbcam(address))
387 return 0;
388 if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
389 return -EINVAL;
50891457 390 __set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
88df6e90 391 wmb();
f63837f0 392 flush_tlb_page(NULL, address);
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393 pte_unmap(kpte);
394
395 return 0;
396}
397
398/*
399 * Change the page attributes of an page in the linear mapping.
400 *
401 * THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY
402 */
403static int change_page_attr(struct page *page, int numpages, pgprot_t prot)
404{
405 int i, err = 0;
406 unsigned long flags;
407
408 local_irq_save(flags);
409 for (i = 0; i < numpages; i++, page++) {
410 err = __change_page_attr(page, prot);
411 if (err)
412 break;
413 }
414 local_irq_restore(flags);
415 return err;
416}
417
418
419void kernel_map_pages(struct page *page, int numpages, int enable)
420{
421 if (PageHighMem(page))
422 return;
423
424 change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
425}
426#endif /* CONFIG_DEBUG_PAGEALLOC */
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427
428static int fixmaps;
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429
430void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)
431{
432 unsigned long address = __fix_to_virt(idx);
433
434 if (idx >= __end_of_fixed_addresses) {
435 BUG();
436 return;
437 }
438
46a74179 439 map_page(address, phys, pgprot_val(flags));
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440 fixmaps++;
441}
442
443void __this_fixmap_does_not_exist(void)
444{
445 WARN_ON(1);
446}