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1 | /* |
2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation, version 2. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
11 | * NON INFRINGEMENT. See the GNU General Public License for | |
12 | * more details. | |
13 | */ | |
14 | ||
15 | #ifndef _ASM_TILE_PROCESSOR_H | |
16 | #define _ASM_TILE_PROCESSOR_H | |
17 | ||
18 | #ifndef __ASSEMBLY__ | |
19 | ||
20 | /* | |
21 | * NOTE: we don't include <linux/ptrace.h> or <linux/percpu.h> as one | |
22 | * normally would, due to #include dependencies. | |
23 | */ | |
24 | #include <asm/ptrace.h> | |
25 | #include <asm/percpu.h> | |
26 | ||
27 | #include <arch/chip.h> | |
28 | #include <arch/spr_def.h> | |
29 | ||
30 | struct task_struct; | |
31 | struct thread_struct; | |
32 | struct list_head; | |
33 | ||
34 | typedef struct { | |
35 | unsigned long seg; | |
36 | } mm_segment_t; | |
37 | ||
38 | /* | |
39 | * Default implementation of macro that returns current | |
40 | * instruction pointer ("program counter"). | |
41 | */ | |
42 | void *current_text_addr(void); | |
43 | ||
44 | #if CHIP_HAS_TILE_DMA() | |
45 | /* Capture the state of a suspended DMA. */ | |
46 | struct tile_dma_state { | |
47 | int enabled; | |
48 | unsigned long src; | |
49 | unsigned long dest; | |
50 | unsigned long strides; | |
51 | unsigned long chunk_size; | |
52 | unsigned long src_chunk; | |
53 | unsigned long dest_chunk; | |
54 | unsigned long byte; | |
55 | unsigned long status; | |
56 | }; | |
57 | ||
58 | /* | |
59 | * A mask of the DMA status register for selecting only the 'running' | |
60 | * and 'done' bits. | |
61 | */ | |
62 | #define DMA_STATUS_MASK \ | |
63 | (SPR_DMA_STATUS__RUNNING_MASK | SPR_DMA_STATUS__DONE_MASK) | |
64 | #endif | |
65 | ||
66 | /* | |
67 | * Track asynchronous TLB events (faults and access violations) | |
68 | * that occur while we are in kernel mode from DMA or the SN processor. | |
69 | */ | |
70 | struct async_tlb { | |
71 | short fault_num; /* original fault number; 0 if none */ | |
72 | char is_fault; /* was it a fault (vs an access violation) */ | |
73 | char is_write; /* for fault: was it caused by a write? */ | |
74 | unsigned long address; /* what address faulted? */ | |
75 | }; | |
76 | ||
77 | ||
78 | struct thread_struct { | |
79 | /* kernel stack pointer */ | |
80 | unsigned long ksp; | |
81 | /* kernel PC */ | |
82 | unsigned long pc; | |
83 | /* starting user stack pointer (for page migration) */ | |
84 | unsigned long usp0; | |
85 | /* pid of process that created this one */ | |
86 | pid_t creator_pid; | |
87 | #if CHIP_HAS_TILE_DMA() | |
88 | /* DMA info for suspended threads (byte == 0 means no DMA state) */ | |
89 | struct tile_dma_state tile_dma_state; | |
90 | #endif | |
91 | /* User EX_CONTEXT registers */ | |
92 | unsigned long ex_context[2]; | |
93 | /* User SYSTEM_SAVE registers */ | |
94 | unsigned long system_save[4]; | |
95 | /* User interrupt mask */ | |
96 | unsigned long long interrupt_mask; | |
97 | /* User interrupt-control 0 state */ | |
98 | unsigned long intctrl_0; | |
99 | #if CHIP_HAS_PROC_STATUS_SPR() | |
100 | /* Any other miscellaneous processor state bits */ | |
101 | unsigned long proc_status; | |
102 | #endif | |
103 | #if CHIP_HAS_TILE_DMA() | |
104 | /* Async DMA TLB fault information */ | |
105 | struct async_tlb dma_async_tlb; | |
106 | #endif | |
107 | #if CHIP_HAS_SN_PROC() | |
108 | /* Was static network processor when we were switched out? */ | |
109 | int sn_proc_running; | |
110 | /* Async SNI TLB fault information */ | |
111 | struct async_tlb sn_async_tlb; | |
112 | #endif | |
113 | }; | |
114 | ||
115 | #endif /* !__ASSEMBLY__ */ | |
116 | ||
117 | /* | |
118 | * Start with "sp" this many bytes below the top of the kernel stack. | |
119 | * This preserves the invariant that a called function may write to *sp. | |
120 | */ | |
121 | #define STACK_TOP_DELTA 8 | |
122 | ||
123 | /* | |
124 | * When entering the kernel via a fault, start with the top of the | |
125 | * pt_regs structure this many bytes below the top of the page. | |
126 | * This aligns the pt_regs structure optimally for cache-line access. | |
127 | */ | |
128 | #ifdef __tilegx__ | |
129 | #define KSTK_PTREGS_GAP 48 | |
130 | #else | |
131 | #define KSTK_PTREGS_GAP 56 | |
132 | #endif | |
133 | ||
134 | #ifndef __ASSEMBLY__ | |
135 | ||
136 | #ifdef __tilegx__ | |
137 | #define TASK_SIZE_MAX (MEM_LOW_END + 1) | |
138 | #else | |
139 | #define TASK_SIZE_MAX PAGE_OFFSET | |
140 | #endif | |
141 | ||
142 | /* TASK_SIZE and related variables are always checked in "current" context. */ | |
143 | #ifdef CONFIG_COMPAT | |
144 | #define COMPAT_TASK_SIZE (1UL << 31) | |
145 | #define TASK_SIZE ((current_thread_info()->status & TS_COMPAT) ?\ | |
146 | COMPAT_TASK_SIZE : TASK_SIZE_MAX) | |
147 | #else | |
148 | #define TASK_SIZE TASK_SIZE_MAX | |
149 | #endif | |
150 | ||
151 | /* We provide a minimal "vdso" a la x86; just the sigreturn code for now. */ | |
152 | #define VDSO_BASE (TASK_SIZE - PAGE_SIZE) | |
153 | ||
154 | #define STACK_TOP VDSO_BASE | |
155 | ||
156 | /* STACK_TOP_MAX is used temporarily in execve and should not check COMPAT. */ | |
157 | #define STACK_TOP_MAX TASK_SIZE_MAX | |
158 | ||
159 | /* | |
160 | * This decides where the kernel will search for a free chunk of vm | |
161 | * space during mmap's, if it is using bottom-up mapping. | |
162 | */ | |
163 | #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) | |
164 | ||
165 | #define HAVE_ARCH_PICK_MMAP_LAYOUT | |
166 | ||
167 | #define INIT_THREAD { \ | |
168 | .ksp = (unsigned long)init_stack + THREAD_SIZE - STACK_TOP_DELTA, \ | |
169 | .interrupt_mask = -1ULL \ | |
170 | } | |
171 | ||
172 | /* Kernel stack top for the task that first boots on this cpu. */ | |
173 | DECLARE_PER_CPU(unsigned long, boot_sp); | |
174 | ||
175 | /* PC to boot from on this cpu. */ | |
176 | DECLARE_PER_CPU(unsigned long, boot_pc); | |
177 | ||
178 | /* Do necessary setup to start up a newly executed thread. */ | |
179 | static inline void start_thread(struct pt_regs *regs, | |
180 | unsigned long pc, unsigned long usp) | |
181 | { | |
182 | regs->pc = pc; | |
183 | regs->sp = usp; | |
184 | } | |
185 | ||
186 | /* Free all resources held by a thread. */ | |
187 | static inline void release_thread(struct task_struct *dead_task) | |
188 | { | |
189 | /* Nothing for now */ | |
190 | } | |
191 | ||
192 | /* Prepare to copy thread state - unlazy all lazy status. */ | |
193 | #define prepare_to_copy(tsk) do { } while (0) | |
194 | ||
195 | extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); | |
196 | ||
197 | /* Helper routines for setting home cache modes at exec() time. */ | |
198 | ||
199 | ||
200 | /* | |
201 | * Return saved (kernel) PC of a blocked thread. | |
202 | * Only used in a printk() in kernel/sched.c, so don't work too hard. | |
203 | */ | |
204 | #define thread_saved_pc(t) ((t)->thread.pc) | |
205 | ||
206 | unsigned long get_wchan(struct task_struct *p); | |
207 | ||
208 | /* Return initial ksp value for given task. */ | |
209 | #define task_ksp0(task) ((unsigned long)(task)->stack + THREAD_SIZE) | |
210 | ||
211 | /* Return some info about the user process TASK. */ | |
212 | #define KSTK_TOP(task) (task_ksp0(task) - STACK_TOP_DELTA) | |
213 | #define task_pt_regs(task) \ | |
214 | ((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1) | |
215 | #define task_sp(task) (task_pt_regs(task)->sp) | |
216 | #define task_pc(task) (task_pt_regs(task)->pc) | |
217 | /* Aliases for pc and sp (used in fs/proc/array.c) */ | |
218 | #define KSTK_EIP(task) task_pc(task) | |
219 | #define KSTK_ESP(task) task_sp(task) | |
220 | ||
221 | /* Standard format for printing registers and other word-size data. */ | |
222 | #ifdef __tilegx__ | |
223 | # define REGFMT "0x%016lx" | |
224 | #else | |
225 | # define REGFMT "0x%08lx" | |
226 | #endif | |
227 | ||
228 | /* | |
229 | * Do some slow action (e.g. read a slow SPR). | |
230 | * Note that this must also have compiler-barrier semantics since | |
231 | * it may be used in a busy loop reading memory. | |
232 | */ | |
233 | static inline void cpu_relax(void) | |
234 | { | |
235 | __insn_mfspr(SPR_PASS); | |
236 | barrier(); | |
237 | } | |
238 | ||
239 | struct siginfo; | |
240 | extern void arch_coredump_signal(struct siginfo *, struct pt_regs *); | |
241 | #define arch_coredump_signal arch_coredump_signal | |
242 | ||
243 | /* Provide information about the chip model. */ | |
244 | extern char chip_model[64]; | |
245 | ||
246 | /* Data on which physical memory controller corresponds to which NUMA node. */ | |
247 | extern int node_controller[]; | |
248 | ||
249 | ||
250 | /* Do we dump information to the console when a user application crashes? */ | |
251 | extern int show_crashinfo; | |
252 | ||
253 | #if CHIP_HAS_CBOX_HOME_MAP() | |
254 | /* Does the heap allocator return hash-for-home pages by default? */ | |
255 | extern int hash_default; | |
256 | ||
257 | /* Should kernel stack pages be hash-for-home? */ | |
258 | extern int kstack_hash; | |
259 | #else | |
260 | #define hash_default 0 | |
261 | #define kstack_hash 0 | |
262 | #endif | |
263 | ||
264 | /* Are we using huge pages in the TLB for kernel data? */ | |
265 | extern int kdata_huge; | |
266 | ||
267 | /* | |
268 | * Note that with OLOC the prefetch will return an unused read word to | |
269 | * the issuing tile, which will cause some MDN traffic. Benchmarking | |
270 | * should be done to see whether this outweighs prefetching. | |
271 | */ | |
272 | #define ARCH_HAS_PREFETCH | |
273 | #define ARCH_HAS_PREFETCHW | |
274 | #define ARCH_HAS_SPINLOCK_PREFETCH | |
275 | ||
276 | #define prefetch(ptr) __builtin_prefetch((ptr), 0, 3) | |
277 | #define prefetchw(ptr) __builtin_prefetch((ptr), 1, 3) | |
278 | ||
279 | #ifdef CONFIG_SMP | |
280 | #define spin_lock_prefetch(ptr) prefetchw(ptr) | |
281 | #else | |
282 | /* Nothing to prefetch. */ | |
283 | #define spin_lock_prefetch(lock) do { } while (0) | |
284 | #endif | |
285 | ||
286 | #else /* __ASSEMBLY__ */ | |
287 | ||
288 | /* Do some slow action (e.g. read a slow SPR). */ | |
289 | #define CPU_RELAX mfspr zero, SPR_PASS | |
290 | ||
291 | #endif /* !__ASSEMBLY__ */ | |
292 | ||
293 | /* Assembly code assumes that the PL is in the low bits. */ | |
294 | #if SPR_EX_CONTEXT_1_1__PL_SHIFT != 0 | |
295 | # error Fix assembly assumptions about PL | |
296 | #endif | |
297 | ||
298 | /* We sometimes use these macros for EX_CONTEXT_0_1 as well. */ | |
299 | #if SPR_EX_CONTEXT_1_1__PL_SHIFT != SPR_EX_CONTEXT_0_1__PL_SHIFT || \ | |
300 | SPR_EX_CONTEXT_1_1__PL_RMASK != SPR_EX_CONTEXT_0_1__PL_RMASK || \ | |
301 | SPR_EX_CONTEXT_1_1__ICS_SHIFT != SPR_EX_CONTEXT_0_1__ICS_SHIFT || \ | |
302 | SPR_EX_CONTEXT_1_1__ICS_RMASK != SPR_EX_CONTEXT_0_1__ICS_RMASK | |
303 | # error Fix assumptions that EX1 macros work for both PL0 and PL1 | |
304 | #endif | |
305 | ||
306 | /* Allow pulling apart and recombining the PL and ICS bits in EX_CONTEXT. */ | |
307 | #define EX1_PL(ex1) \ | |
308 | (((ex1) >> SPR_EX_CONTEXT_1_1__PL_SHIFT) & SPR_EX_CONTEXT_1_1__PL_RMASK) | |
309 | #define EX1_ICS(ex1) \ | |
310 | (((ex1) >> SPR_EX_CONTEXT_1_1__ICS_SHIFT) & SPR_EX_CONTEXT_1_1__ICS_RMASK) | |
311 | #define PL_ICS_EX1(pl, ics) \ | |
312 | (((pl) << SPR_EX_CONTEXT_1_1__PL_SHIFT) | \ | |
313 | ((ics) << SPR_EX_CONTEXT_1_1__ICS_SHIFT)) | |
314 | ||
315 | /* | |
316 | * Provide symbolic constants for PLs. | |
317 | * Note that assembly code assumes that USER_PL is zero. | |
318 | */ | |
319 | #define USER_PL 0 | |
320 | #define KERNEL_PL 1 | |
321 | ||
322 | /* SYSTEM_SAVE_1_0 holds the current cpu number ORed with ksp0. */ | |
323 | #define CPU_LOG_MASK_VALUE 12 | |
324 | #define CPU_MASK_VALUE ((1 << CPU_LOG_MASK_VALUE) - 1) | |
325 | #if CONFIG_NR_CPUS > CPU_MASK_VALUE | |
326 | # error Too many cpus! | |
327 | #endif | |
328 | #define raw_smp_processor_id() \ | |
329 | ((int)__insn_mfspr(SPR_SYSTEM_SAVE_1_0) & CPU_MASK_VALUE) | |
330 | #define get_current_ksp0() \ | |
331 | (__insn_mfspr(SPR_SYSTEM_SAVE_1_0) & ~CPU_MASK_VALUE) | |
332 | #define next_current_ksp0(task) ({ \ | |
333 | unsigned long __ksp0 = task_ksp0(task); \ | |
334 | int __cpu = raw_smp_processor_id(); \ | |
335 | BUG_ON(__ksp0 & CPU_MASK_VALUE); \ | |
336 | __ksp0 | __cpu; \ | |
337 | }) | |
338 | ||
339 | #endif /* _ASM_TILE_PROCESSOR_H */ |