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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1994 Waldorf GMBH | |
7 | * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle | |
8 | * Copyright (C) 1996 Paul M. Antoine | |
9 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
10 | */ | |
11 | #ifndef _ASM_PROCESSOR_H | |
12 | #define _ASM_PROCESSOR_H | |
13 | ||
41c594ab | 14 | #include <linux/cpumask.h> |
1da177e4 LT |
15 | #include <linux/threads.h> |
16 | ||
17 | #include <asm/cachectl.h> | |
18 | #include <asm/cpu.h> | |
19 | #include <asm/cpu-info.h> | |
20 | #include <asm/mipsregs.h> | |
21 | #include <asm/prefetch.h> | |
22 | #include <asm/system.h> | |
23 | ||
24 | /* | |
25 | * Return current * instruction pointer ("program counter"). | |
26 | */ | |
27 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) | |
28 | ||
29 | /* | |
30 | * System setup and hardware flags.. | |
31 | */ | |
32 | extern void (*cpu_wait)(void); | |
33 | ||
34 | extern unsigned int vced_count, vcei_count; | |
35 | ||
c52d0d30 DD |
36 | /* |
37 | * A special page (the vdso) is mapped into all processes at the very | |
38 | * top of the virtual memory space. | |
39 | */ | |
40 | #define SPECIAL_PAGES_SIZE PAGE_SIZE | |
41 | ||
875d43e7 | 42 | #ifdef CONFIG_32BIT |
1da177e4 LT |
43 | /* |
44 | * User space process size: 2GB. This is hardcoded into a few places, | |
45 | * so don't change it unless you know what you are doing. | |
46 | */ | |
47 | #define TASK_SIZE 0x7fff8000UL | |
c52d0d30 | 48 | #define STACK_TOP ((TASK_SIZE & PAGE_MASK) - SPECIAL_PAGES_SIZE) |
1da177e4 LT |
49 | |
50 | /* | |
51 | * This decides where the kernel will search for a free chunk of vm | |
52 | * space during mmap's. | |
53 | */ | |
27ac792c | 54 | #define TASK_UNMAPPED_BASE ((TASK_SIZE / 3) & ~(PAGE_SIZE)) |
1da177e4 LT |
55 | #endif |
56 | ||
875d43e7 | 57 | #ifdef CONFIG_64BIT |
1da177e4 LT |
58 | /* |
59 | * User space process size: 1TB. This is hardcoded into a few places, | |
60 | * so don't change it unless you know what you are doing. TASK_SIZE | |
61 | * is limited to 1TB by the R4000 architecture; R10000 and better can | |
62 | * support 16TB; the architectural reserve for future expansion is | |
63 | * 8192EB ... | |
64 | */ | |
65 | #define TASK_SIZE32 0x7fff8000UL | |
66 | #define TASK_SIZE 0x10000000000UL | |
922a70d3 | 67 | #define STACK_TOP \ |
c52d0d30 DD |
68 | (((test_thread_flag(TIF_32BIT_ADDR) ? \ |
69 | TASK_SIZE32 : TASK_SIZE) & PAGE_MASK) - SPECIAL_PAGES_SIZE) | |
1da177e4 LT |
70 | |
71 | /* | |
72 | * This decides where the kernel will search for a free chunk of vm | |
73 | * space during mmap's. | |
74 | */ | |
293c5bd1 RB |
75 | #define TASK_UNMAPPED_BASE \ |
76 | (test_thread_flag(TIF_32BIT_ADDR) ? \ | |
77 | PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3)) | |
82455257 DH |
78 | #define TASK_SIZE_OF(tsk) \ |
79 | (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE) | |
1da177e4 LT |
80 | #endif |
81 | ||
922a70d3 DH |
82 | #ifdef __KERNEL__ |
83 | #define STACK_TOP_MAX TASK_SIZE | |
84 | #endif | |
85 | ||
1da177e4 LT |
86 | #define NUM_FPU_REGS 32 |
87 | ||
88 | typedef __u64 fpureg_t; | |
89 | ||
1da177e4 LT |
90 | /* |
91 | * It would be nice to add some more fields for emulator statistics, but there | |
92 | * are a number of fixed offsets in offset.h and elsewhere that would have to | |
93 | * be recalculated by hand. So the additional information will be private to | |
94 | * the FPU emulator for now. See asm-mips/fpu_emulator.h. | |
95 | */ | |
96 | ||
eae89076 | 97 | struct mips_fpu_struct { |
1da177e4 LT |
98 | fpureg_t fpr[NUM_FPU_REGS]; |
99 | unsigned int fcr31; | |
100 | }; | |
101 | ||
e50c0a8f RB |
102 | #define NUM_DSP_REGS 6 |
103 | ||
104 | typedef __u32 dspreg_t; | |
105 | ||
106 | struct mips_dsp_state { | |
107 | dspreg_t dspr[NUM_DSP_REGS]; | |
108 | unsigned int dspcontrol; | |
e50c0a8f RB |
109 | }; |
110 | ||
41c594ab RB |
111 | #define INIT_CPUMASK { \ |
112 | {0,} \ | |
113 | } | |
114 | ||
6aa3524c DD |
115 | struct mips3264_watch_reg_state { |
116 | /* The width of watchlo is 32 in a 32 bit kernel and 64 in a | |
117 | 64 bit kernel. We use unsigned long as it has the same | |
118 | property. */ | |
119 | unsigned long watchlo[NUM_WATCH_REGS]; | |
120 | /* Only the mask and IRW bits from watchhi. */ | |
121 | u16 watchhi[NUM_WATCH_REGS]; | |
122 | }; | |
123 | ||
124 | union mips_watch_reg_state { | |
125 | struct mips3264_watch_reg_state mips3264; | |
126 | }; | |
127 | ||
b5e00af8 DD |
128 | #ifdef CONFIG_CPU_CAVIUM_OCTEON |
129 | ||
130 | struct octeon_cop2_state { | |
131 | /* DMFC2 rt, 0x0201 */ | |
132 | unsigned long cop2_crc_iv; | |
133 | /* DMFC2 rt, 0x0202 (Set with DMTC2 rt, 0x1202) */ | |
134 | unsigned long cop2_crc_length; | |
135 | /* DMFC2 rt, 0x0200 (set with DMTC2 rt, 0x4200) */ | |
136 | unsigned long cop2_crc_poly; | |
137 | /* DMFC2 rt, 0x0402; DMFC2 rt, 0x040A */ | |
138 | unsigned long cop2_llm_dat[2]; | |
139 | /* DMFC2 rt, 0x0084 */ | |
140 | unsigned long cop2_3des_iv; | |
141 | /* DMFC2 rt, 0x0080; DMFC2 rt, 0x0081; DMFC2 rt, 0x0082 */ | |
142 | unsigned long cop2_3des_key[3]; | |
143 | /* DMFC2 rt, 0x0088 (Set with DMTC2 rt, 0x0098) */ | |
144 | unsigned long cop2_3des_result; | |
145 | /* DMFC2 rt, 0x0111 (FIXME: Read Pass1 Errata) */ | |
146 | unsigned long cop2_aes_inp0; | |
147 | /* DMFC2 rt, 0x0102; DMFC2 rt, 0x0103 */ | |
148 | unsigned long cop2_aes_iv[2]; | |
149 | /* DMFC2 rt, 0x0104; DMFC2 rt, 0x0105; DMFC2 rt, 0x0106; DMFC2 | |
150 | * rt, 0x0107 */ | |
151 | unsigned long cop2_aes_key[4]; | |
152 | /* DMFC2 rt, 0x0110 */ | |
153 | unsigned long cop2_aes_keylen; | |
154 | /* DMFC2 rt, 0x0100; DMFC2 rt, 0x0101 */ | |
155 | unsigned long cop2_aes_result[2]; | |
156 | /* DMFC2 rt, 0x0240; DMFC2 rt, 0x0241; DMFC2 rt, 0x0242; DMFC2 | |
157 | * rt, 0x0243; DMFC2 rt, 0x0244; DMFC2 rt, 0x0245; DMFC2 rt, | |
158 | * 0x0246; DMFC2 rt, 0x0247; DMFC2 rt, 0x0248; DMFC2 rt, | |
159 | * 0x0249; DMFC2 rt, 0x024A; DMFC2 rt, 0x024B; DMFC2 rt, | |
160 | * 0x024C; DMFC2 rt, 0x024D; DMFC2 rt, 0x024E - Pass2 */ | |
161 | unsigned long cop2_hsh_datw[15]; | |
162 | /* DMFC2 rt, 0x0250; DMFC2 rt, 0x0251; DMFC2 rt, 0x0252; DMFC2 | |
163 | * rt, 0x0253; DMFC2 rt, 0x0254; DMFC2 rt, 0x0255; DMFC2 rt, | |
164 | * 0x0256; DMFC2 rt, 0x0257 - Pass2 */ | |
165 | unsigned long cop2_hsh_ivw[8]; | |
166 | /* DMFC2 rt, 0x0258; DMFC2 rt, 0x0259 - Pass2 */ | |
167 | unsigned long cop2_gfm_mult[2]; | |
168 | /* DMFC2 rt, 0x025E - Pass2 */ | |
169 | unsigned long cop2_gfm_poly; | |
170 | /* DMFC2 rt, 0x025A; DMFC2 rt, 0x025B - Pass2 */ | |
171 | unsigned long cop2_gfm_result[2]; | |
172 | }; | |
173 | #define INIT_OCTEON_COP2 {0,} | |
174 | ||
175 | struct octeon_cvmseg_state { | |
176 | unsigned long cvmseg[CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE] | |
177 | [cpu_dcache_line_size() / sizeof(unsigned long)]; | |
178 | }; | |
179 | ||
180 | #endif | |
181 | ||
1da177e4 LT |
182 | typedef struct { |
183 | unsigned long seg; | |
184 | } mm_segment_t; | |
185 | ||
186 | #define ARCH_MIN_TASKALIGN 8 | |
187 | ||
e50c0a8f RB |
188 | struct mips_abi; |
189 | ||
1da177e4 LT |
190 | /* |
191 | * If you change thread_struct remember to change the #defines below too! | |
192 | */ | |
193 | struct thread_struct { | |
194 | /* Saved main processor registers. */ | |
195 | unsigned long reg16; | |
196 | unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23; | |
197 | unsigned long reg29, reg30, reg31; | |
198 | ||
199 | /* Saved cp0 stuff. */ | |
200 | unsigned long cp0_status; | |
201 | ||
202 | /* Saved fpu/fpu emulator stuff. */ | |
eae89076 | 203 | struct mips_fpu_struct fpu; |
f088fc84 RB |
204 | #ifdef CONFIG_MIPS_MT_FPAFF |
205 | /* Emulated instruction count */ | |
206 | unsigned long emulated_fp; | |
207 | /* Saved per-thread scheduler affinity mask */ | |
208 | cpumask_t user_cpus_allowed; | |
209 | #endif /* CONFIG_MIPS_MT_FPAFF */ | |
1da177e4 | 210 | |
e50c0a8f RB |
211 | /* Saved state of the DSP ASE, if available. */ |
212 | struct mips_dsp_state dsp; | |
213 | ||
6aa3524c DD |
214 | /* Saved watch register state, if available. */ |
215 | union mips_watch_reg_state watch; | |
216 | ||
1da177e4 LT |
217 | /* Other stuff associated with the thread. */ |
218 | unsigned long cp0_badvaddr; /* Last user fault */ | |
219 | unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */ | |
220 | unsigned long error_code; | |
221 | unsigned long trap_no; | |
1da177e4 LT |
222 | unsigned long irix_trampoline; /* Wheee... */ |
223 | unsigned long irix_oldctx; | |
b5e00af8 DD |
224 | #ifdef CONFIG_CPU_CAVIUM_OCTEON |
225 | struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128))); | |
226 | struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128))); | |
227 | #endif | |
e50c0a8f | 228 | struct mips_abi *abi; |
1da177e4 LT |
229 | }; |
230 | ||
f088fc84 | 231 | #ifdef CONFIG_MIPS_MT_FPAFF |
fee578fa RB |
232 | #define FPAFF_INIT \ |
233 | .emulated_fp = 0, \ | |
234 | .user_cpus_allowed = INIT_CPUMASK, | |
f088fc84 RB |
235 | #else |
236 | #define FPAFF_INIT | |
237 | #endif /* CONFIG_MIPS_MT_FPAFF */ | |
238 | ||
b5e00af8 DD |
239 | #ifdef CONFIG_CPU_CAVIUM_OCTEON |
240 | #define OCTEON_INIT \ | |
241 | .cp2 = INIT_OCTEON_COP2, | |
242 | #else | |
243 | #define OCTEON_INIT | |
244 | #endif /* CONFIG_CPU_CAVIUM_OCTEON */ | |
245 | ||
fee578fa RB |
246 | #define INIT_THREAD { \ |
247 | /* \ | |
248 | * Saved main processor registers \ | |
249 | */ \ | |
250 | .reg16 = 0, \ | |
251 | .reg17 = 0, \ | |
252 | .reg18 = 0, \ | |
253 | .reg19 = 0, \ | |
254 | .reg20 = 0, \ | |
255 | .reg21 = 0, \ | |
256 | .reg22 = 0, \ | |
257 | .reg23 = 0, \ | |
258 | .reg29 = 0, \ | |
259 | .reg30 = 0, \ | |
260 | .reg31 = 0, \ | |
261 | /* \ | |
262 | * Saved cp0 stuff \ | |
263 | */ \ | |
264 | .cp0_status = 0, \ | |
265 | /* \ | |
266 | * Saved FPU/FPU emulator stuff \ | |
267 | */ \ | |
268 | .fpu = { \ | |
269 | .fpr = {0,}, \ | |
270 | .fcr31 = 0, \ | |
271 | }, \ | |
272 | /* \ | |
273 | * FPU affinity state (null if not FPAFF) \ | |
274 | */ \ | |
275 | FPAFF_INIT \ | |
276 | /* \ | |
277 | * Saved DSP stuff \ | |
278 | */ \ | |
279 | .dsp = { \ | |
280 | .dspr = {0, }, \ | |
281 | .dspcontrol = 0, \ | |
282 | }, \ | |
6aa3524c DD |
283 | /* \ |
284 | * saved watch register stuff \ | |
285 | */ \ | |
286 | .watch = {{{0,},},}, \ | |
fee578fa RB |
287 | /* \ |
288 | * Other stuff associated with the process \ | |
289 | */ \ | |
290 | .cp0_badvaddr = 0, \ | |
291 | .cp0_baduaddr = 0, \ | |
292 | .error_code = 0, \ | |
293 | .trap_no = 0, \ | |
fee578fa RB |
294 | .irix_trampoline = 0, \ |
295 | .irix_oldctx = 0, \ | |
b5e00af8 DD |
296 | /* \ |
297 | * Cavium Octeon specifics (null if not Octeon) \ | |
298 | */ \ | |
299 | OCTEON_INIT \ | |
1da177e4 LT |
300 | } |
301 | ||
302 | struct task_struct; | |
303 | ||
304 | /* Free all resources held by a thread. */ | |
305 | #define release_thread(thread) do { } while(0) | |
306 | ||
307 | /* Prepare to copy thread state - unlazy all lazy status */ | |
308 | #define prepare_to_copy(tsk) do { } while (0) | |
309 | ||
310 | extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
311 | ||
312 | extern unsigned long thread_saved_pc(struct task_struct *tsk); | |
313 | ||
314 | /* | |
315 | * Do necessary setup to start up a newly executed thread. | |
316 | */ | |
317 | extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp); | |
318 | ||
319 | unsigned long get_wchan(struct task_struct *p); | |
320 | ||
484889fc DD |
321 | #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \ |
322 | THREAD_SIZE - 32 - sizeof(struct pt_regs)) | |
323 | #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk)) | |
40bc9c67 AV |
324 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc) |
325 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29]) | |
326 | #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status) | |
1da177e4 LT |
327 | |
328 | #define cpu_relax() barrier() | |
329 | ||
330 | /* | |
331 | * Return_address is a replacement for __builtin_return_address(count) | |
332 | * which on certain architectures cannot reasonably be implemented in GCC | |
333 | * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386). | |
334 | * Note that __builtin_return_address(x>=1) is forbidden because GCC | |
335 | * aborts compilation on some CPUs. It's simply not possible to unwind | |
336 | * some CPU's stackframes. | |
337 | * | |
338 | * __builtin_return_address works only for non-leaf functions. We avoid the | |
339 | * overhead of a function call by forcing the compiler to save the return | |
340 | * address register on the stack. | |
341 | */ | |
342 | #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);}) | |
343 | ||
344 | #ifdef CONFIG_CPU_HAS_PREFETCH | |
345 | ||
346 | #define ARCH_HAS_PREFETCH | |
347 | ||
9797cae3 | 348 | static inline void prefetch(const void *addr) |
1da177e4 LT |
349 | { |
350 | __asm__ __volatile__( | |
351 | " .set mips4 \n" | |
352 | " pref %0, (%1) \n" | |
353 | " .set mips0 \n" | |
354 | : | |
355 | : "i" (Pref_Load), "r" (addr)); | |
356 | } | |
357 | ||
358 | #endif | |
359 | ||
360 | #endif /* _ASM_PROCESSOR_H */ |