aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/include/asm/processor.h
blob: ead6928fa6b822f7671ddec1859bbd217e799b88 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994 Waldorf GMBH
 * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle
 * Copyright (C) 1996 Paul M. Antoine
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 */
#ifndef _ASM_PROCESSOR_H
#define _ASM_PROCESSOR_H

#include <linux/cpumask.h>
#include <linux/threads.h>

#include <asm/cachectl.h>
#include <asm/cpu.h>
#include <asm/cpu-info.h>
#include <asm/mipsregs.h>
#include <asm/prefetch.h>
#include <asm/system.h>

/*
 * Return current * instruction pointer ("program counter").
 */
#define current_text_addr() ({ __label__ _l; _l: &&_l;})

/*
 * System setup and hardware flags..
 */
extern void (*cpu_wait)(void);

extern unsigned int vced_count, vcei_count;

/*
 * MIPS does have an arch_pick_mmap_layout()
 */
#define HAVE_ARCH_PICK_MMAP_LAYOUT 1

/*
 * A special page (the vdso) is mapped into all processes at the very
 * top of the virtual memory space.
 */
#define SPECIAL_PAGES_SIZE PAGE_SIZE

#ifdef CONFIG_32BIT
/*
 * User space process size: 2GB. This is hardcoded into a few places,
 * so don't change it unless you know what you are doing.
 */
#define TASK_SIZE	0x7fff8000UL

#ifdef __KERNEL__
#define STACK_TOP_MAX	TASK_SIZE
#endif

#define TASK_IS_32BIT_ADDR 1

#endif

#ifdef CONFIG_64BIT
/*
 * User space process size: 1TB. This is hardcoded into a few places,
 * so don't change it unless you know what you are doing.  TASK_SIZE
 * is limited to 1TB by the R4000 architecture; R10000 and better can
 * support 16TB; the architectural reserve for future expansion is
 * 8192EB ...
 */
#define TASK_SIZE32	0x7fff8000UL
#define TASK_SIZE64	0x10000000000UL
#define TASK_SIZE (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)

#ifdef __KERNEL__
#define STACK_TOP_MAX	TASK_SIZE64
#endif


#define TASK_SIZE_OF(tsk)						\
	(test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)

#define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)

#endif

#define STACK_TOP	((TASK_SIZE & PAGE_MASK) - SPECIAL_PAGES_SIZE)

/*
 * This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)


#define NUM_FPU_REGS	32

typedef __u64 fpureg_t;

/*
 * It would be nice to add some more fields for emulator statistics, but there
 * are a number of fixed offsets in offset.h and elsewhere that would have to
 * be recalculated by hand.  So the additional information will be private to
 * the FPU emulator for now.  See asm-mips/fpu_emulator.h.
 */

struct mips_fpu_struct {
	fpureg_t	fpr[NUM_FPU_REGS];
	unsigned int	fcr31;
};

#define NUM_DSP_REGS   6

typedef __u32 dspreg_t;

struct mips_dsp_state {
	dspreg_t        dspr[NUM_DSP_REGS];
	unsigned int    dspcontrol;
};

#define INIT_CPUMASK { \
	{0,} \
}

struct mips3264_watch_reg_state {
	/* The width of watchlo is 32 in a 32 bit kernel and 64 in a
	   64 bit kernel.  We use unsigned long as it has the same
	   property. */
	unsigned long watchlo[NUM_WATCH_REGS];
	/* Only the mask and IRW bits from watchhi. */
	u16 watchhi[NUM_WATCH_REGS];
};

union mips_watch_reg_state {
	struct mips3264_watch_reg_state mips3264;
};

#ifdef CONFIG_CPU_CAVIUM_OCTEON

struct octeon_cop2_state {
	/* DMFC2 rt, 0x0201 */
	unsigned long   cop2_crc_iv;
	/* DMFC2 rt, 0x0202 (Set with DMTC2 rt, 0x1202) */
	unsigned long   cop2_crc_length;
	/* DMFC2 rt, 0x0200 (set with DMTC2 rt, 0x4200) */
	unsigned long   cop2_crc_poly;
	/* DMFC2 rt, 0x0402; DMFC2 rt, 0x040A */
	unsigned long   cop2_llm_dat[2];
       /* DMFC2 rt, 0x0084 */
	unsigned long   cop2_3des_iv;
	/* DMFC2 rt, 0x0080; DMFC2 rt, 0x0081; DMFC2 rt, 0x0082 */
	unsigned long   cop2_3des_key[3];
	/* DMFC2 rt, 0x0088 (Set with DMTC2 rt, 0x0098) */
	unsigned long   cop2_3des_result;
	/* DMFC2 rt, 0x0111 (FIXME: Read Pass1 Errata) */
	unsigned long   cop2_aes_inp0;
	/* DMFC2 rt, 0x0102; DMFC2 rt, 0x0103 */
	unsigned long   cop2_aes_iv[2];
	/* DMFC2 rt, 0x0104; DMFC2 rt, 0x0105; DMFC2 rt, 0x0106; DMFC2
	 * rt, 0x0107 */
	unsigned long   cop2_aes_key[4];
	/* DMFC2 rt, 0x0110 */
	unsigned long   cop2_aes_keylen;
	/* DMFC2 rt, 0x0100; DMFC2 rt, 0x0101 */
	unsigned long   cop2_aes_result[2];
	/* DMFC2 rt, 0x0240; DMFC2 rt, 0x0241; DMFC2 rt, 0x0242; DMFC2
	 * rt, 0x0243; DMFC2 rt, 0x0244; DMFC2 rt, 0x0245; DMFC2 rt,
	 * 0x0246; DMFC2 rt, 0x0247; DMFC2 rt, 0x0248; DMFC2 rt,
	 * 0x0249; DMFC2 rt, 0x024A; DMFC2 rt, 0x024B; DMFC2 rt,
	 * 0x024C; DMFC2 rt, 0x024D; DMFC2 rt, 0x024E - Pass2 */
	unsigned long   cop2_hsh_datw[15];
	/* DMFC2 rt, 0x0250; DMFC2 rt, 0x0251; DMFC2 rt, 0x0252; DMFC2
	 * rt, 0x0253; DMFC2 rt, 0x0254; DMFC2 rt, 0x0255; DMFC2 rt,
	 * 0x0256; DMFC2 rt, 0x0257 - Pass2 */
	unsigned long   cop2_hsh_ivw[8];
	/* DMFC2 rt, 0x0258; DMFC2 rt, 0x0259 - Pass2 */
	unsigned long   cop2_gfm_mult[2];
	/* DMFC2 rt, 0x025E - Pass2 */
	unsigned long   cop2_gfm_poly;
	/* DMFC2 rt, 0x025A; DMFC2 rt, 0x025B - Pass2 */
	unsigned long   cop2_gfm_result[2];
};
#define INIT_OCTEON_COP2 {0,}

struct octeon_cvmseg_state {
	unsigned long cvmseg[CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE]
			    [cpu_dcache_line_size() / sizeof(unsigned long)];
};

#endif

typedef struct {
	unsigned long seg;
} mm_segment_t;

#define ARCH_MIN_TASKALIGN	8

struct mips_abi;

/*
 * If you change thread_struct remember to change the #defines below too!
 */
struct thread_struct {
	/* Saved main processor registers. */
	unsigned long reg16;
	unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
	unsigned long reg29, reg30, reg31;

	/* Saved cp0 stuff. */
	unsigned long cp0_status;

	/* Saved fpu/fpu emulator stuff. */
	struct mips_fpu_struct fpu;
#ifdef CONFIG_MIPS_MT_FPAFF
	/* Emulated instruction count */
	unsigned long emulated_fp;
	/* Saved per-thread scheduler affinity mask */
	cpumask_t user_cpus_allowed;
#endif /* CONFIG_MIPS_MT_FPAFF */

	/* Saved state of the DSP ASE, if available. */
	struct mips_dsp_state dsp;

	/* Saved watch register state, if available. */
	union mips_watch_reg_state watch;

	/* Other stuff associated with the thread. */
	unsigned long cp0_badvaddr;	/* Last user fault */
	unsigned long cp0_baduaddr;	/* Last kernel fault accessing USEG */
	unsigned long error_code;
	unsigned long irix_trampoline;  /* Wheee... */
	unsigned long irix_oldctx;
#ifdef CONFIG_CPU_CAVIUM_OCTEON
    struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));
    struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));
#endif
	struct mips_abi *abi;
};

#ifdef CONFIG_MIPS_MT_FPAFF
#define FPAFF_INIT						\
	.emulated_fp			= 0,			\
	.user_cpus_allowed		= INIT_CPUMASK,
#else
#define FPAFF_INIT
#endif /* CONFIG_MIPS_MT_FPAFF */

#ifdef CONFIG_CPU_CAVIUM_OCTEON
#define OCTEON_INIT						\
	.cp2			= INIT_OCTEON_COP2,
#else
#define OCTEON_INIT
#endif /* CONFIG_CPU_CAVIUM_OCTEON */

#define INIT_THREAD  {						\
        /*							\
         * Saved main processor registers			\
         */							\
	.reg16			= 0,				\
	.reg17			= 0,				\
	.reg18			= 0,				\
	.reg19			= 0,				\
	.reg20			= 0,				\
	.reg21			= 0,				\
	.reg22			= 0,				\
	.reg23			= 0,				\
	.reg29			= 0,				\
	.reg30			= 0,				\
	.reg31			= 0,				\
	/*							\
	 * Saved cp0 stuff					\
	 */							\
	.cp0_status		= 0,				\
	/*							\
	 * Saved FPU/FPU emulator stuff				\
	 */							\
	.fpu			= {				\
		.fpr		= {0,},				\
		.fcr31		= 0,				\
	},							\
	/*							\
	 * FPU affinity state (null if not FPAFF)		\
	 */							\
	FPAFF_INIT						\
	/*							\
	 * Saved DSP stuff					\
	 */							\
	.dsp			= {				\
		.dspr		= {0, },			\
		.dspcontrol	= 0,				\
	},							\
	/*							\
	 * saved watch register stuff				\
	 */							\
	.watch = {{{0,},},},					\
	/*							\
	 * Other stuff associated with the process		\
	 */							\
	.cp0_badvaddr		= 0,				\
	.cp0_baduaddr		= 0,				\
	.error_code		= 0,				\
	.irix_trampoline	= 0,				\
	.irix_oldctx		= 0,				\
	/*							\
	 * Cavium Octeon specifics (null if not Octeon)		\
	 */							\
	OCTEON_INIT						\
}

struct task_struct;

/* Free all resources held by a thread. */
#define release_thread(thread) do { } while(0)

/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk)	do { } while (0)

extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

extern unsigned long thread_saved_pc(struct task_struct *tsk);

/*
 * Do necessary setup to start up a newly executed thread.
 */
extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);

unsigned long get_wchan(struct task_struct *p);

#define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \
			 THREAD_SIZE - 32 - sizeof(struct pt_regs))
#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
#define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)

#define cpu_relax()	barrier()

/*
 * Return_address is a replacement for __builtin_return_address(count)
 * which on certain architectures cannot reasonably be implemented in GCC
 * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
 * Note that __builtin_return_address(x>=1) is forbidden because GCC
 * aborts compilation on some CPUs.  It's simply not possible to unwind
 * some CPU's stackframes.
 *
 * __builtin_return_address works only for non-leaf functions.  We avoid the
 * overhead of a function call by forcing the compiler to save the return
 * address register on the stack.
 */
#define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})

#ifdef CONFIG_CPU_HAS_PREFETCH

#define ARCH_HAS_PREFETCH
#define prefetch(x) __builtin_prefetch((x), 0, 1)

#define ARCH_HAS_PREFETCHW
#define prefetchw(x) __builtin_prefetch((x), 1, 1)

#endif

#endif /* _ASM_PROCESSOR_H */