arch/mips/include/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/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
 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 */