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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
31extern unsigned int vced_count, vcei_count;
32extern 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
73extern 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
91union 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) \
103static inline u##width get_fpr##width(union fpureg *fpr, unsigned idx) \
104{ \
105 return fpr->val##width[FPR_IDX(width, idx)]; \
106} \
107 \
108static 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
114BUILD_FPR_ACCESS(32)
115BUILD_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
123struct 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
131typedef unsigned long dspreg_t;
132
133struct mips_dsp_state {
134 dspreg_t dspr[NUM_DSP_REGS];
135 unsigned int dspcontrol;
136};
137
138#define INIT_CPUMASK { \
139 {0,} \
140}
141
142struct 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
151union mips_watch_reg_state {
152 struct mips3264_watch_reg_state mips3264;
153};
154
155#if defined(CONFIG_CPU_CAVIUM_OCTEON)
156
157struct 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
205struct octeon_cvmseg_state {
206 unsigned long cvmseg[CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE]
207 [cpu_dcache_line_size() / sizeof(unsigned long)];
208};
209
210#else
211#define COP2_INIT
212#endif
213
214#ifdef CONFIG_CPU_HAS_MSA
215# define ARCH_MIN_TASKALIGN 16
216# define FPU_ALIGN __aligned(16)
217#else
218# define ARCH_MIN_TASKALIGN 8
219# define FPU_ALIGN
220#endif
221
222struct mips_abi;
223
224/*
225 * If you change thread_struct remember to change the #defines below too!
226 */
227struct thread_struct {
228 /* Saved main processor registers. */
229 unsigned long reg16;
230 unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
231 unsigned long reg29, reg30, reg31;
232
233 /* Saved cp0 stuff. */
234 unsigned long cp0_status;
235
236#ifdef CONFIG_MIPS_FP_SUPPORT
237 /* Saved fpu/fpu emulator stuff. */
238 struct mips_fpu_struct fpu FPU_ALIGN;
239 /* Assigned branch delay slot 'emulation' frame */
240 atomic_t bd_emu_frame;
241 /* PC of the branch from a branch delay slot 'emulation' */
242 unsigned long bd_emu_branch_pc;
243 /* PC to continue from following a branch delay slot 'emulation' */
244 unsigned long bd_emu_cont_pc;
245#endif
246#ifdef CONFIG_MIPS_MT_FPAFF
247 /* Emulated instruction count */
248 unsigned long emulated_fp;
249 /* Saved per-thread scheduler affinity mask */
250 cpumask_t user_cpus_allowed;
251#endif /* CONFIG_MIPS_MT_FPAFF */
252
253 /* Saved state of the DSP ASE, if available. */
254 struct mips_dsp_state dsp;
255
256 /* Saved watch register state, if available. */
257 union mips_watch_reg_state watch;
258
259 /* Other stuff associated with the thread. */
260 unsigned long cp0_badvaddr; /* Last user fault */
261 unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
262 unsigned long error_code;
263 unsigned long trap_nr;
264#ifdef CONFIG_CPU_CAVIUM_OCTEON
265 struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));
266 struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));
267#endif
268 struct mips_abi *abi;
269};
270
271#ifdef CONFIG_MIPS_MT_FPAFF
272#define FPAFF_INIT \
273 .emulated_fp = 0, \
274 .user_cpus_allowed = INIT_CPUMASK,
275#else
276#define FPAFF_INIT
277#endif /* CONFIG_MIPS_MT_FPAFF */
278
279#ifdef CONFIG_MIPS_FP_SUPPORT
280# define FPU_INIT \
281 .fpu = { \
282 .fpr = {{{0,},},}, \
283 .fcr31 = 0, \
284 .msacsr = 0, \
285 }, \
286 /* Delay slot emulation */ \
287 .bd_emu_frame = ATOMIC_INIT(BD_EMUFRAME_NONE), \
288 .bd_emu_branch_pc = 0, \
289 .bd_emu_cont_pc = 0,
290#else
291# define FPU_INIT
292#endif
293
294#define INIT_THREAD { \
295 /* \
296 * Saved main processor registers \
297 */ \
298 .reg16 = 0, \
299 .reg17 = 0, \
300 .reg18 = 0, \
301 .reg19 = 0, \
302 .reg20 = 0, \
303 .reg21 = 0, \
304 .reg22 = 0, \
305 .reg23 = 0, \
306 .reg29 = 0, \
307 .reg30 = 0, \
308 .reg31 = 0, \
309 /* \
310 * Saved cp0 stuff \
311 */ \
312 .cp0_status = 0, \
313 /* \
314 * Saved FPU/FPU emulator stuff \
315 */ \
316 FPU_INIT \
317 /* \
318 * FPU affinity state (null if not FPAFF) \
319 */ \
320 FPAFF_INIT \
321 /* \
322 * Saved DSP stuff \
323 */ \
324 .dsp = { \
325 .dspr = {0, }, \
326 .dspcontrol = 0, \
327 }, \
328 /* \
329 * saved watch register stuff \
330 */ \
331 .watch = {{{0,},},}, \
332 /* \
333 * Other stuff associated with the process \
334 */ \
335 .cp0_badvaddr = 0, \
336 .cp0_baduaddr = 0, \
337 .error_code = 0, \
338 .trap_nr = 0, \
339 /* \
340 * Platform specific cop2 registers(null if no COP2) \
341 */ \
342 COP2_INIT \
343}
344
345struct task_struct;
346
347/*
348 * Do necessary setup to start up a newly executed thread.
349 */
350extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
351
352static inline void flush_thread(void)
353{
354}
355
356unsigned long __get_wchan(struct task_struct *p);
357
358#define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \
359 THREAD_SIZE - 32 - sizeof(struct pt_regs))
360#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))
361#define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
362#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
363#define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
364
365/*
366 * Return_address is a replacement for __builtin_return_address(count)
367 * which on certain architectures cannot reasonably be implemented in GCC
368 * (MIPS, Alpha) or is unusable with -fomit-frame-pointer (i386).
369 * Note that __builtin_return_address(x>=1) is forbidden because GCC
370 * aborts compilation on some CPUs. It's simply not possible to unwind
371 * some CPU's stackframes.
372 *
373 * __builtin_return_address works only for non-leaf functions. We avoid the
374 * overhead of a function call by forcing the compiler to save the return
375 * address register on the stack.
376 */
377#define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
378
379#ifdef CONFIG_CPU_HAS_PREFETCH
380
381#define ARCH_HAS_PREFETCH
382#define prefetch(x) __builtin_prefetch((x), 0, 1)
383
384#define ARCH_HAS_PREFETCHW
385#define prefetchw(x) __builtin_prefetch((x), 1, 1)
386
387#endif
388
389/*
390 * Functions & macros implementing the PR_GET_FP_MODE & PR_SET_FP_MODE options
391 * to the prctl syscall.
392 */
393extern int mips_get_process_fp_mode(struct task_struct *task);
394extern int mips_set_process_fp_mode(struct task_struct *task,
395 unsigned int value);
396
397#define GET_FP_MODE(task) mips_get_process_fp_mode(task)
398#define SET_FP_MODE(task,value) mips_set_process_fp_mode(task, value)
399
400#endif /* _ASM_PROCESSOR_H */
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/cpumask.h>
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
23/*
24 * Return current * instruction pointer ("program counter").
25 */
26#define current_text_addr() ({ __label__ _l; _l: &&_l;})
27
28/*
29 * System setup and hardware flags..
30 */
31extern void (*cpu_wait)(void);
32
33extern unsigned int vced_count, vcei_count;
34
35/*
36 * MIPS does have an arch_pick_mmap_layout()
37 */
38#define HAVE_ARCH_PICK_MMAP_LAYOUT 1
39
40/*
41 * A special page (the vdso) is mapped into all processes at the very
42 * top of the virtual memory space.
43 */
44#define SPECIAL_PAGES_SIZE PAGE_SIZE
45
46#ifdef CONFIG_32BIT
47/*
48 * User space process size: 2GB. This is hardcoded into a few places,
49 * so don't change it unless you know what you are doing.
50 */
51#define TASK_SIZE 0x7fff8000UL
52
53#ifdef __KERNEL__
54#define STACK_TOP_MAX TASK_SIZE
55#endif
56
57#define TASK_IS_32BIT_ADDR 1
58
59#endif
60
61#ifdef CONFIG_64BIT
62/*
63 * User space process size: 1TB. This is hardcoded into a few places,
64 * so don't change it unless you know what you are doing. TASK_SIZE
65 * is limited to 1TB by the R4000 architecture; R10000 and better can
66 * support 16TB; the architectural reserve for future expansion is
67 * 8192EB ...
68 */
69#define TASK_SIZE32 0x7fff8000UL
70#define TASK_SIZE64 0x10000000000UL
71#define TASK_SIZE (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
72
73#ifdef __KERNEL__
74#define STACK_TOP_MAX TASK_SIZE64
75#endif
76
77
78#define TASK_SIZE_OF(tsk) \
79 (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
80
81#define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)
82
83#endif
84
85#define STACK_TOP ((TASK_SIZE & PAGE_MASK) - SPECIAL_PAGES_SIZE)
86
87/*
88 * This decides where the kernel will search for a free chunk of vm
89 * space during mmap's.
90 */
91#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
92
93
94#define NUM_FPU_REGS 32
95
96typedef __u64 fpureg_t;
97
98/*
99 * It would be nice to add some more fields for emulator statistics, but there
100 * are a number of fixed offsets in offset.h and elsewhere that would have to
101 * be recalculated by hand. So the additional information will be private to
102 * the FPU emulator for now. See asm-mips/fpu_emulator.h.
103 */
104
105struct mips_fpu_struct {
106 fpureg_t fpr[NUM_FPU_REGS];
107 unsigned int fcr31;
108};
109
110#define NUM_DSP_REGS 6
111
112typedef __u32 dspreg_t;
113
114struct mips_dsp_state {
115 dspreg_t dspr[NUM_DSP_REGS];
116 unsigned int dspcontrol;
117};
118
119#define INIT_CPUMASK { \
120 {0,} \
121}
122
123struct mips3264_watch_reg_state {
124 /* The width of watchlo is 32 in a 32 bit kernel and 64 in a
125 64 bit kernel. We use unsigned long as it has the same
126 property. */
127 unsigned long watchlo[NUM_WATCH_REGS];
128 /* Only the mask and IRW bits from watchhi. */
129 u16 watchhi[NUM_WATCH_REGS];
130};
131
132union mips_watch_reg_state {
133 struct mips3264_watch_reg_state mips3264;
134};
135
136#ifdef CONFIG_CPU_CAVIUM_OCTEON
137
138struct octeon_cop2_state {
139 /* DMFC2 rt, 0x0201 */
140 unsigned long cop2_crc_iv;
141 /* DMFC2 rt, 0x0202 (Set with DMTC2 rt, 0x1202) */
142 unsigned long cop2_crc_length;
143 /* DMFC2 rt, 0x0200 (set with DMTC2 rt, 0x4200) */
144 unsigned long cop2_crc_poly;
145 /* DMFC2 rt, 0x0402; DMFC2 rt, 0x040A */
146 unsigned long cop2_llm_dat[2];
147 /* DMFC2 rt, 0x0084 */
148 unsigned long cop2_3des_iv;
149 /* DMFC2 rt, 0x0080; DMFC2 rt, 0x0081; DMFC2 rt, 0x0082 */
150 unsigned long cop2_3des_key[3];
151 /* DMFC2 rt, 0x0088 (Set with DMTC2 rt, 0x0098) */
152 unsigned long cop2_3des_result;
153 /* DMFC2 rt, 0x0111 (FIXME: Read Pass1 Errata) */
154 unsigned long cop2_aes_inp0;
155 /* DMFC2 rt, 0x0102; DMFC2 rt, 0x0103 */
156 unsigned long cop2_aes_iv[2];
157 /* DMFC2 rt, 0x0104; DMFC2 rt, 0x0105; DMFC2 rt, 0x0106; DMFC2
158 * rt, 0x0107 */
159 unsigned long cop2_aes_key[4];
160 /* DMFC2 rt, 0x0110 */
161 unsigned long cop2_aes_keylen;
162 /* DMFC2 rt, 0x0100; DMFC2 rt, 0x0101 */
163 unsigned long cop2_aes_result[2];
164 /* DMFC2 rt, 0x0240; DMFC2 rt, 0x0241; DMFC2 rt, 0x0242; DMFC2
165 * rt, 0x0243; DMFC2 rt, 0x0244; DMFC2 rt, 0x0245; DMFC2 rt,
166 * 0x0246; DMFC2 rt, 0x0247; DMFC2 rt, 0x0248; DMFC2 rt,
167 * 0x0249; DMFC2 rt, 0x024A; DMFC2 rt, 0x024B; DMFC2 rt,
168 * 0x024C; DMFC2 rt, 0x024D; DMFC2 rt, 0x024E - Pass2 */
169 unsigned long cop2_hsh_datw[15];
170 /* DMFC2 rt, 0x0250; DMFC2 rt, 0x0251; DMFC2 rt, 0x0252; DMFC2
171 * rt, 0x0253; DMFC2 rt, 0x0254; DMFC2 rt, 0x0255; DMFC2 rt,
172 * 0x0256; DMFC2 rt, 0x0257 - Pass2 */
173 unsigned long cop2_hsh_ivw[8];
174 /* DMFC2 rt, 0x0258; DMFC2 rt, 0x0259 - Pass2 */
175 unsigned long cop2_gfm_mult[2];
176 /* DMFC2 rt, 0x025E - Pass2 */
177 unsigned long cop2_gfm_poly;
178 /* DMFC2 rt, 0x025A; DMFC2 rt, 0x025B - Pass2 */
179 unsigned long cop2_gfm_result[2];
180};
181#define INIT_OCTEON_COP2 {0,}
182
183struct octeon_cvmseg_state {
184 unsigned long cvmseg[CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE]
185 [cpu_dcache_line_size() / sizeof(unsigned long)];
186};
187
188#endif
189
190typedef struct {
191 unsigned long seg;
192} mm_segment_t;
193
194#define ARCH_MIN_TASKALIGN 8
195
196struct mips_abi;
197
198/*
199 * If you change thread_struct remember to change the #defines below too!
200 */
201struct thread_struct {
202 /* Saved main processor registers. */
203 unsigned long reg16;
204 unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
205 unsigned long reg29, reg30, reg31;
206
207 /* Saved cp0 stuff. */
208 unsigned long cp0_status;
209
210 /* Saved fpu/fpu emulator stuff. */
211 struct mips_fpu_struct fpu;
212#ifdef CONFIG_MIPS_MT_FPAFF
213 /* Emulated instruction count */
214 unsigned long emulated_fp;
215 /* Saved per-thread scheduler affinity mask */
216 cpumask_t user_cpus_allowed;
217#endif /* CONFIG_MIPS_MT_FPAFF */
218
219 /* Saved state of the DSP ASE, if available. */
220 struct mips_dsp_state dsp;
221
222 /* Saved watch register state, if available. */
223 union mips_watch_reg_state watch;
224
225 /* Other stuff associated with the thread. */
226 unsigned long cp0_badvaddr; /* Last user fault */
227 unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
228 unsigned long error_code;
229 unsigned long irix_trampoline; /* Wheee... */
230 unsigned long irix_oldctx;
231#ifdef CONFIG_CPU_CAVIUM_OCTEON
232 struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));
233 struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));
234#endif
235 struct mips_abi *abi;
236};
237
238#ifdef CONFIG_MIPS_MT_FPAFF
239#define FPAFF_INIT \
240 .emulated_fp = 0, \
241 .user_cpus_allowed = INIT_CPUMASK,
242#else
243#define FPAFF_INIT
244#endif /* CONFIG_MIPS_MT_FPAFF */
245
246#ifdef CONFIG_CPU_CAVIUM_OCTEON
247#define OCTEON_INIT \
248 .cp2 = INIT_OCTEON_COP2,
249#else
250#define OCTEON_INIT
251#endif /* CONFIG_CPU_CAVIUM_OCTEON */
252
253#define INIT_THREAD { \
254 /* \
255 * Saved main processor registers \
256 */ \
257 .reg16 = 0, \
258 .reg17 = 0, \
259 .reg18 = 0, \
260 .reg19 = 0, \
261 .reg20 = 0, \
262 .reg21 = 0, \
263 .reg22 = 0, \
264 .reg23 = 0, \
265 .reg29 = 0, \
266 .reg30 = 0, \
267 .reg31 = 0, \
268 /* \
269 * Saved cp0 stuff \
270 */ \
271 .cp0_status = 0, \
272 /* \
273 * Saved FPU/FPU emulator stuff \
274 */ \
275 .fpu = { \
276 .fpr = {0,}, \
277 .fcr31 = 0, \
278 }, \
279 /* \
280 * FPU affinity state (null if not FPAFF) \
281 */ \
282 FPAFF_INIT \
283 /* \
284 * Saved DSP stuff \
285 */ \
286 .dsp = { \
287 .dspr = {0, }, \
288 .dspcontrol = 0, \
289 }, \
290 /* \
291 * saved watch register stuff \
292 */ \
293 .watch = {{{0,},},}, \
294 /* \
295 * Other stuff associated with the process \
296 */ \
297 .cp0_badvaddr = 0, \
298 .cp0_baduaddr = 0, \
299 .error_code = 0, \
300 .irix_trampoline = 0, \
301 .irix_oldctx = 0, \
302 /* \
303 * Cavium Octeon specifics (null if not Octeon) \
304 */ \
305 OCTEON_INIT \
306}
307
308struct task_struct;
309
310/* Free all resources held by a thread. */
311#define release_thread(thread) do { } while(0)
312
313extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
314
315extern unsigned long thread_saved_pc(struct task_struct *tsk);
316
317/*
318 * Do necessary setup to start up a newly executed thread.
319 */
320extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
321
322unsigned long get_wchan(struct task_struct *p);
323
324#define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \
325 THREAD_SIZE - 32 - sizeof(struct pt_regs))
326#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))
327#define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
328#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
329#define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
330
331#define cpu_relax() barrier()
332
333/*
334 * Return_address is a replacement for __builtin_return_address(count)
335 * which on certain architectures cannot reasonably be implemented in GCC
336 * (MIPS, Alpha) or is unusable with -fomit-frame-pointer (i386).
337 * Note that __builtin_return_address(x>=1) is forbidden because GCC
338 * aborts compilation on some CPUs. It's simply not possible to unwind
339 * some CPU's stackframes.
340 *
341 * __builtin_return_address works only for non-leaf functions. We avoid the
342 * overhead of a function call by forcing the compiler to save the return
343 * address register on the stack.
344 */
345#define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
346
347#ifdef CONFIG_CPU_HAS_PREFETCH
348
349#define ARCH_HAS_PREFETCH
350#define prefetch(x) __builtin_prefetch((x), 0, 1)
351
352#define ARCH_HAS_PREFETCHW
353#define prefetchw(x) __builtin_prefetch((x), 1, 1)
354
355/*
356 * See Documentation/scheduler/sched-arch.txt; prevents deadlock on SMP
357 * systems.
358 */
359#define __ARCH_WANT_UNLOCKED_CTXSW
360
361#endif
362
363#endif /* _ASM_PROCESSOR_H */