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
14 #include <linux/atomic.h>
15 #include <linux/cpumask.h>
16 #include <linux/sizes.h>
17 #include <linux/threads.h>
18
19 #include <asm/cachectl.h>
20 #include <asm/cpu.h>
21 #include <asm/cpu-info.h>
22 #include <asm/dsemul.h>
23 #include <asm/mipsregs.h>
24 #include <asm/prefetch.h>
25 #include <asm/vdso/processor.h>
26
27 /*
28 * System setup and hardware flags..
29 */
30
31 extern unsigned int vced_count, vcei_count;
32 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
33
34 #ifdef CONFIG_32BIT
35 /*
36 * User space process size: 2GB. This is hardcoded into a few places,
37 * so don't change it unless you know what you are doing.
38 */
39 #define TASK_SIZE 0x80000000UL
40
41 #define STACK_TOP_MAX TASK_SIZE
42
43 #define TASK_IS_32BIT_ADDR 1
44
45 #endif
46
47 #ifdef CONFIG_64BIT
48 /*
49 * User space process size: 1TB. This is hardcoded into a few places,
50 * so don't change it unless you know what you are doing. TASK_SIZE
51 * is limited to 1TB by the R4000 architecture; R10000 and better can
52 * support 16TB; the architectural reserve for future expansion is
53 * 8192EB ...
54 */
55 #define TASK_SIZE32 0x7fff8000UL
56 #ifdef CONFIG_MIPS_VA_BITS_48
57 #define TASK_SIZE64 (0x1UL << ((cpu_data[0].vmbits>48)?48:cpu_data[0].vmbits))
58 #else
59 #define TASK_SIZE64 0x10000000000UL
60 #endif
61 #define TASK_SIZE (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
62 #define STACK_TOP_MAX TASK_SIZE64
63
64 #define TASK_SIZE_OF(tsk) \
65 (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
66
67 #define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)
68
69 #endif
70
71 #define VDSO_RANDOMIZE_SIZE (TASK_IS_32BIT_ADDR ? SZ_1M : SZ_64M)
72
73 extern unsigned long mips_stack_top(void);
74 #define STACK_TOP mips_stack_top()
75
76 /*
77 * This decides where the kernel will search for a free chunk of vm
78 * space during mmap's.
79 */
80 #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
81
82
83 #define NUM_FPU_REGS 32
84
85 #ifdef CONFIG_CPU_HAS_MSA
86 # define FPU_REG_WIDTH 128
87 #else
88 # define FPU_REG_WIDTH 64
89 #endif
90
91 union fpureg {
92 __u32 val32[FPU_REG_WIDTH / 32];
93 __u64 val64[FPU_REG_WIDTH / 64];
94 };
95
96 #ifdef CONFIG_CPU_LITTLE_ENDIAN
97 # define FPR_IDX(width, idx) (idx)
98 #else
99 # define FPR_IDX(width, idx) ((idx) ^ ((64 / (width)) - 1))
100 #endif
101
102 #define BUILD_FPR_ACCESS(width) \
103 static inline u##width get_fpr##width(union fpureg *fpr, unsigned idx) \
104 { \
105 return fpr->val##width[FPR_IDX(width, idx)]; \
106 } \
107 \
108 static inline void set_fpr##width(union fpureg *fpr, unsigned idx, \
109 u##width val) \
110 { \
111 fpr->val##width[FPR_IDX(width, idx)] = val; \
112 }
113
114 BUILD_FPR_ACCESS(32)
115 BUILD_FPR_ACCESS(64)
116
117 /*
118 * It would be nice to add some more fields for emulator statistics,
119 * the additional information is private to the FPU emulator for now.
120 * See arch/mips/include/asm/fpu_emulator.h.
121 */
122
123 struct mips_fpu_struct {
124 union fpureg fpr[NUM_FPU_REGS];
125 unsigned int fcr31;
126 unsigned int msacsr;
127 };
128
129 #define NUM_DSP_REGS 6
130
131 typedef unsigned long dspreg_t;
132
133 struct mips_dsp_state {
134 dspreg_t dspr[NUM_DSP_REGS];
135 unsigned int dspcontrol;
136 };
137
138 #define INIT_CPUMASK { \
139 {0,} \
140 }
141
142 struct mips3264_watch_reg_state {
143 /* The width of watchlo is 32 in a 32 bit kernel and 64 in a
144 64 bit kernel. We use unsigned long as it has the same
145 property. */
146 unsigned long watchlo[NUM_WATCH_REGS];
147 /* Only the mask and IRW bits from watchhi. */
148 u16 watchhi[NUM_WATCH_REGS];
149 };
150
151 union mips_watch_reg_state {
152 struct mips3264_watch_reg_state mips3264;
153 };
154
155 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
156
157 struct octeon_cop2_state {
158 /* DMFC2 rt, 0x0201 */
159 unsigned long cop2_crc_iv;
160 /* DMFC2 rt, 0x0202 (Set with DMTC2 rt, 0x1202) */
161 unsigned long cop2_crc_length;
162 /* DMFC2 rt, 0x0200 (set with DMTC2 rt, 0x4200) */
163 unsigned long cop2_crc_poly;
164 /* DMFC2 rt, 0x0402; DMFC2 rt, 0x040A */
165 unsigned long cop2_llm_dat[2];
166 /* DMFC2 rt, 0x0084 */
167 unsigned long cop2_3des_iv;
168 /* DMFC2 rt, 0x0080; DMFC2 rt, 0x0081; DMFC2 rt, 0x0082 */
169 unsigned long cop2_3des_key[3];
170 /* DMFC2 rt, 0x0088 (Set with DMTC2 rt, 0x0098) */
171 unsigned long cop2_3des_result;
172 /* DMFC2 rt, 0x0111 (FIXME: Read Pass1 Errata) */
173 unsigned long cop2_aes_inp0;
174 /* DMFC2 rt, 0x0102; DMFC2 rt, 0x0103 */
175 unsigned long cop2_aes_iv[2];
176 /* DMFC2 rt, 0x0104; DMFC2 rt, 0x0105; DMFC2 rt, 0x0106; DMFC2
177 * rt, 0x0107 */
178 unsigned long cop2_aes_key[4];
179 /* DMFC2 rt, 0x0110 */
180 unsigned long cop2_aes_keylen;
181 /* DMFC2 rt, 0x0100; DMFC2 rt, 0x0101 */
182 unsigned long cop2_aes_result[2];
183 /* DMFC2 rt, 0x0240; DMFC2 rt, 0x0241; DMFC2 rt, 0x0242; DMFC2
184 * rt, 0x0243; DMFC2 rt, 0x0244; DMFC2 rt, 0x0245; DMFC2 rt,
185 * 0x0246; DMFC2 rt, 0x0247; DMFC2 rt, 0x0248; DMFC2 rt,
186 * 0x0249; DMFC2 rt, 0x024A; DMFC2 rt, 0x024B; DMFC2 rt,
187 * 0x024C; DMFC2 rt, 0x024D; DMFC2 rt, 0x024E - Pass2 */
188 unsigned long cop2_hsh_datw[15];
189 /* DMFC2 rt, 0x0250; DMFC2 rt, 0x0251; DMFC2 rt, 0x0252; DMFC2
190 * rt, 0x0253; DMFC2 rt, 0x0254; DMFC2 rt, 0x0255; DMFC2 rt,
191 * 0x0256; DMFC2 rt, 0x0257 - Pass2 */
192 unsigned long cop2_hsh_ivw[8];
193 /* DMFC2 rt, 0x0258; DMFC2 rt, 0x0259 - Pass2 */
194 unsigned long cop2_gfm_mult[2];
195 /* DMFC2 rt, 0x025E - Pass2 */
196 unsigned long cop2_gfm_poly;
197 /* DMFC2 rt, 0x025A; DMFC2 rt, 0x025B - Pass2 */
198 unsigned long cop2_gfm_result[2];
199 /* DMFC2 rt, 0x24F, DMFC2 rt, 0x50, OCTEON III */
200 unsigned long cop2_sha3[2];
201 };
202 #define COP2_INIT \
203 .cp2 = {0,},
204
205 struct octeon_cvmseg_state {
206 unsigned long cvmseg[CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE]
207 [cpu_dcache_line_size() / sizeof(unsigned long)];
208 };
209
210 #elif defined(CONFIG_CPU_XLP)
211 struct nlm_cop2_state {
212 u64 rx[4];
213 u64 tx[4];
214 u32 tx_msg_status;
215 u32 rx_msg_status;
216 };
217
218 #define COP2_INIT \
219 .cp2 = {{0}, {0}, 0, 0},
220 #else
221 #define COP2_INIT
222 #endif
223
224 #ifdef CONFIG_CPU_HAS_MSA
225 # define ARCH_MIN_TASKALIGN 16
226 # define FPU_ALIGN __aligned(16)
227 #else
228 # define ARCH_MIN_TASKALIGN 8
229 # define FPU_ALIGN
230 #endif
231
232 struct mips_abi;
233
234 /*
235 * If you change thread_struct remember to change the #defines below too!
236 */
237 struct thread_struct {
238 /* Saved main processor registers. */
239 unsigned long reg16;
240 unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
241 unsigned long reg29, reg30, reg31;
242
243 /* Saved cp0 stuff. */
244 unsigned long cp0_status;
245
246 #ifdef CONFIG_MIPS_FP_SUPPORT
247 /* Saved fpu/fpu emulator stuff. */
248 struct mips_fpu_struct fpu FPU_ALIGN;
249 /* Assigned branch delay slot 'emulation' frame */
250 atomic_t bd_emu_frame;
251 /* PC of the branch from a branch delay slot 'emulation' */
252 unsigned long bd_emu_branch_pc;
253 /* PC to continue from following a branch delay slot 'emulation' */
254 unsigned long bd_emu_cont_pc;
255 #endif
256 #ifdef CONFIG_MIPS_MT_FPAFF
257 /* Emulated instruction count */
258 unsigned long emulated_fp;
259 /* Saved per-thread scheduler affinity mask */
260 cpumask_t user_cpus_allowed;
261 #endif /* CONFIG_MIPS_MT_FPAFF */
262
263 /* Saved state of the DSP ASE, if available. */
264 struct mips_dsp_state dsp;
265
266 /* Saved watch register state, if available. */
267 union mips_watch_reg_state watch;
268
269 /* Other stuff associated with the thread. */
270 unsigned long cp0_badvaddr; /* Last user fault */
271 unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
272 unsigned long error_code;
273 unsigned long trap_nr;
274 #ifdef CONFIG_CPU_CAVIUM_OCTEON
275 struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));
276 struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));
277 #endif
278 #ifdef CONFIG_CPU_XLP
279 struct nlm_cop2_state cp2;
280 #endif
281 struct mips_abi *abi;
282 };
283
284 #ifdef CONFIG_MIPS_MT_FPAFF
285 #define FPAFF_INIT \
286 .emulated_fp = 0, \
287 .user_cpus_allowed = INIT_CPUMASK,
288 #else
289 #define FPAFF_INIT
290 #endif /* CONFIG_MIPS_MT_FPAFF */
291
292 #ifdef CONFIG_MIPS_FP_SUPPORT
293 # define FPU_INIT \
294 .fpu = { \
295 .fpr = {{{0,},},}, \
296 .fcr31 = 0, \
297 .msacsr = 0, \
298 }, \
299 /* Delay slot emulation */ \
300 .bd_emu_frame = ATOMIC_INIT(BD_EMUFRAME_NONE), \
301 .bd_emu_branch_pc = 0, \
302 .bd_emu_cont_pc = 0,
303 #else
304 # define FPU_INIT
305 #endif
306
307 #define INIT_THREAD { \
308 /* \
309 * Saved main processor registers \
310 */ \
311 .reg16 = 0, \
312 .reg17 = 0, \
313 .reg18 = 0, \
314 .reg19 = 0, \
315 .reg20 = 0, \
316 .reg21 = 0, \
317 .reg22 = 0, \
318 .reg23 = 0, \
319 .reg29 = 0, \
320 .reg30 = 0, \
321 .reg31 = 0, \
322 /* \
323 * Saved cp0 stuff \
324 */ \
325 .cp0_status = 0, \
326 /* \
327 * Saved FPU/FPU emulator stuff \
328 */ \
329 FPU_INIT \
330 /* \
331 * FPU affinity state (null if not FPAFF) \
332 */ \
333 FPAFF_INIT \
334 /* \
335 * Saved DSP stuff \
336 */ \
337 .dsp = { \
338 .dspr = {0, }, \
339 .dspcontrol = 0, \
340 }, \
341 /* \
342 * saved watch register stuff \
343 */ \
344 .watch = {{{0,},},}, \
345 /* \
346 * Other stuff associated with the process \
347 */ \
348 .cp0_badvaddr = 0, \
349 .cp0_baduaddr = 0, \
350 .error_code = 0, \
351 .trap_nr = 0, \
352 /* \
353 * Platform specific cop2 registers(null if no COP2) \
354 */ \
355 COP2_INIT \
356 }
357
358 struct task_struct;
359
360 /* Free all resources held by a thread. */
361 #define release_thread(thread) do { } while(0)
362
363 /*
364 * Do necessary setup to start up a newly executed thread.
365 */
366 extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
367
flush_thread(void)368 static inline void flush_thread(void)
369 {
370 }
371
372 unsigned long get_wchan(struct task_struct *p);
373
374 #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \
375 THREAD_SIZE - 32 - sizeof(struct pt_regs))
376 #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))
377 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
378 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
379 #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
380
381 /*
382 * Return_address is a replacement for __builtin_return_address(count)
383 * which on certain architectures cannot reasonably be implemented in GCC
384 * (MIPS, Alpha) or is unusable with -fomit-frame-pointer (i386).
385 * Note that __builtin_return_address(x>=1) is forbidden because GCC
386 * aborts compilation on some CPUs. It's simply not possible to unwind
387 * some CPU's stackframes.
388 *
389 * __builtin_return_address works only for non-leaf functions. We avoid the
390 * overhead of a function call by forcing the compiler to save the return
391 * address register on the stack.
392 */
393 #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
394
395 #ifdef CONFIG_CPU_HAS_PREFETCH
396
397 #define ARCH_HAS_PREFETCH
398 #define prefetch(x) __builtin_prefetch((x), 0, 1)
399
400 #define ARCH_HAS_PREFETCHW
401 #define prefetchw(x) __builtin_prefetch((x), 1, 1)
402
403 #endif
404
405 /*
406 * Functions & macros implementing the PR_GET_FP_MODE & PR_SET_FP_MODE options
407 * to the prctl syscall.
408 */
409 extern int mips_get_process_fp_mode(struct task_struct *task);
410 extern int mips_set_process_fp_mode(struct task_struct *task,
411 unsigned int value);
412
413 #define GET_FP_MODE(task) mips_get_process_fp_mode(task)
414 #define SET_FP_MODE(task,value) mips_set_process_fp_mode(task, value)
415
416 #endif /* _ASM_PROCESSOR_H */
417