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/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  */
  31
  32 extern unsigned int vced_count, vcei_count;
  33
  34 /*
  35  * MIPS does have an arch_pick_mmap_layout()
  36  */
  37 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
  38
  39 #ifdef CONFIG_32BIT
  40 #ifdef CONFIG_KVM_GUEST
  41 /* User space process size is limited to 1GB in KVM Guest Mode */
  42 #define TASK_SIZE       0x3fff8000UL
  43 #else
  44 /*
  45  * User space process size: 2GB. This is hardcoded into a few places,
  46  * so don't change it unless you know what you are doing.
  47  */
  48 #define TASK_SIZE       0x80000000UL
  49 #endif
  50
  51 #define STACK_TOP_MAX   TASK_SIZE
  52
  53 #define TASK_IS_32BIT_ADDR 1
  54
  55 #endif
  56
  57 #ifdef CONFIG_64BIT
  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 #ifdef CONFIG_MIPS_VA_BITS_48
  67 #define TASK_SIZE64     (0x1UL << ((cpu_data[0].vmbits>48)?48:cpu_data[0].vmbits))
  68 #else
  69 #define TASK_SIZE64     0x10000000000UL
  70 #endif
  71 #define TASK_SIZE (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
  72 #define STACK_TOP_MAX   TASK_SIZE64
  73
  74 #define TASK_SIZE_OF(tsk)                                               \
  75         (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
  76
  77 #define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)
  78
  79 #endif
  80
  81 #define STACK_TOP       (TASK_SIZE & PAGE_MASK)
  82
  83 /*
  84  * This decides where the kernel will search for a free chunk of vm
  85  * space during mmap's.
  86  */
  87 #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
  88
  89
  90 #define NUM_FPU_REGS    32
  91
  92 #ifdef CONFIG_CPU_HAS_MSA
  93 # define FPU_REG_WIDTH  128
  94 #else
  95 # define FPU_REG_WIDTH  64
  96 #endif
  97
  98 union fpureg {
  99         __u32   val32[FPU_REG_WIDTH / 32];
 100         __u64   val64[FPU_REG_WIDTH / 64];
 101 };
 102
 103 #ifdef CONFIG_CPU_LITTLE_ENDIAN
 104 # define FPR_IDX(width, idx)    (idx)
 105 #else
 106 # define FPR_IDX(width, idx)    ((idx) ^ ((64 / (width)) - 1))
 107 #endif
 108
 109 #define BUILD_FPR_ACCESS(width) \
 110 static inline u##width get_fpr##width(union fpureg *fpr, unsigned idx)  \
 111 {                                                                       \
 112         return fpr->val##width[FPR_IDX(width, idx)];                    \
 113 }                                                                       \
 114                                                                         \
 115 static inline void set_fpr##width(union fpureg *fpr, unsigned idx,      \
 116                                   u##width val)                         \
 117 {                                                                       \
 118         fpr->val##width[FPR_IDX(width, idx)] = val;                     \
 119 }
 120
 121 BUILD_FPR_ACCESS(32)
 122 BUILD_FPR_ACCESS(64)
 123
 124 /*
 125  * It would be nice to add some more fields for emulator statistics,
 126  * the additional information is private to the FPU emulator for now.
 127  * See arch/mips/include/asm/fpu_emulator.h.
 128  */
 129
 130 struct mips_fpu_struct {
 131         union fpureg    fpr[NUM_FPU_REGS];
 132         unsigned int    fcr31;
 133         unsigned int    msacsr;
 134 };
 135
 136 #define NUM_DSP_REGS   6
 137
 138 typedef __u32 dspreg_t;
 139
 140 struct mips_dsp_state {
 141         dspreg_t        dspr[NUM_DSP_REGS];
 142         unsigned int    dspcontrol;
 143 };
 144
 145 #define INIT_CPUMASK { \
 146         {0,} \
 147 }
 148
 149 struct mips3264_watch_reg_state {
 150         /* The width of watchlo is 32 in a 32 bit kernel and 64 in a
 151            64 bit kernel.  We use unsigned long as it has the same
 152            property. */
 153         unsigned long watchlo[NUM_WATCH_REGS];
 154         /* Only the mask and IRW bits from watchhi. */
 155         u16 watchhi[NUM_WATCH_REGS];
 156 };
 157
 158 union mips_watch_reg_state {
 159         struct mips3264_watch_reg_state mips3264;
 160 };
 161
 162 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 163
 164 struct octeon_cop2_state {
 165         /* DMFC2 rt, 0x0201 */
 166         unsigned long   cop2_crc_iv;
 167         /* DMFC2 rt, 0x0202 (Set with DMTC2 rt, 0x1202) */
 168         unsigned long   cop2_crc_length;
 169         /* DMFC2 rt, 0x0200 (set with DMTC2 rt, 0x4200) */
 170         unsigned long   cop2_crc_poly;
 171         /* DMFC2 rt, 0x0402; DMFC2 rt, 0x040A */
 172         unsigned long   cop2_llm_dat[2];
 173        /* DMFC2 rt, 0x0084 */
 174         unsigned long   cop2_3des_iv;
 175         /* DMFC2 rt, 0x0080; DMFC2 rt, 0x0081; DMFC2 rt, 0x0082 */
 176         unsigned long   cop2_3des_key[3];
 177         /* DMFC2 rt, 0x0088 (Set with DMTC2 rt, 0x0098) */
 178         unsigned long   cop2_3des_result;
 179         /* DMFC2 rt, 0x0111 (FIXME: Read Pass1 Errata) */
 180         unsigned long   cop2_aes_inp0;
 181         /* DMFC2 rt, 0x0102; DMFC2 rt, 0x0103 */
 182         unsigned long   cop2_aes_iv[2];
 183         /* DMFC2 rt, 0x0104; DMFC2 rt, 0x0105; DMFC2 rt, 0x0106; DMFC2
 184          * rt, 0x0107 */
 185         unsigned long   cop2_aes_key[4];
 186         /* DMFC2 rt, 0x0110 */
 187         unsigned long   cop2_aes_keylen;
 188         /* DMFC2 rt, 0x0100; DMFC2 rt, 0x0101 */
 189         unsigned long   cop2_aes_result[2];
 190         /* DMFC2 rt, 0x0240; DMFC2 rt, 0x0241; DMFC2 rt, 0x0242; DMFC2
 191          * rt, 0x0243; DMFC2 rt, 0x0244; DMFC2 rt, 0x0245; DMFC2 rt,
 192          * 0x0246; DMFC2 rt, 0x0247; DMFC2 rt, 0x0248; DMFC2 rt,
 193          * 0x0249; DMFC2 rt, 0x024A; DMFC2 rt, 0x024B; DMFC2 rt,
 194          * 0x024C; DMFC2 rt, 0x024D; DMFC2 rt, 0x024E - Pass2 */
 195         unsigned long   cop2_hsh_datw[15];
 196         /* DMFC2 rt, 0x0250; DMFC2 rt, 0x0251; DMFC2 rt, 0x0252; DMFC2
 197          * rt, 0x0253; DMFC2 rt, 0x0254; DMFC2 rt, 0x0255; DMFC2 rt,
 198          * 0x0256; DMFC2 rt, 0x0257 - Pass2 */
 199         unsigned long   cop2_hsh_ivw[8];
 200         /* DMFC2 rt, 0x0258; DMFC2 rt, 0x0259 - Pass2 */
 201         unsigned long   cop2_gfm_mult[2];
 202         /* DMFC2 rt, 0x025E - Pass2 */
 203         unsigned long   cop2_gfm_poly;
 204         /* DMFC2 rt, 0x025A; DMFC2 rt, 0x025B - Pass2 */
 205         unsigned long   cop2_gfm_result[2];
 206         /* DMFC2 rt, 0x24F, DMFC2 rt, 0x50, OCTEON III */
 207         unsigned long   cop2_sha3[2];
 208 };
 209 #define COP2_INIT                                               \
 210         .cp2                    = {0,},
 211
 212 struct octeon_cvmseg_state {
 213         unsigned long cvmseg[CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE]
 214                             [cpu_dcache_line_size() / sizeof(unsigned long)];
 215 };
 216
 217 #elif defined(CONFIG_CPU_XLP)
 218 struct nlm_cop2_state {
 219         u64     rx[4];
 220         u64     tx[4];
 221         u32     tx_msg_status;
 222         u32     rx_msg_status;
 223 };
 224
 225 #define COP2_INIT                                               \
 226         .cp2                    = {{0}, {0}, 0, 0},
 227 #else
 228 #define COP2_INIT
 229 #endif
 230
 231 typedef struct {
 232         unsigned long seg;
 233 } mm_segment_t;
 234
 235 #ifdef CONFIG_CPU_HAS_MSA
 236 # define ARCH_MIN_TASKALIGN     16
 237 # define FPU_ALIGN              __aligned(16)
 238 #else
 239 # define ARCH_MIN_TASKALIGN     8
 240 # define FPU_ALIGN
 241 #endif
 242
 243 struct mips_abi;
 244
 245 /*
 246  * If you change thread_struct remember to change the #defines below too!
 247  */
 248 struct thread_struct {
 249         /* Saved main processor registers. */
 250         unsigned long reg16;
 251         unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
 252         unsigned long reg29, reg30, reg31;
 253
 254         /* Saved cp0 stuff. */
 255         unsigned long cp0_status;
 256
 257         /* Saved fpu/fpu emulator stuff. */
 258         struct mips_fpu_struct fpu FPU_ALIGN;
 259 #ifdef CONFIG_MIPS_MT_FPAFF
 260         /* Emulated instruction count */
 261         unsigned long emulated_fp;
 262         /* Saved per-thread scheduler affinity mask */
 263         cpumask_t user_cpus_allowed;
 264 #endif /* CONFIG_MIPS_MT_FPAFF */
 265
 266         /* Saved state of the DSP ASE, if available. */
 267         struct mips_dsp_state dsp;
 268
 269         /* Saved watch register state, if available. */
 270         union mips_watch_reg_state watch;
 271
 272         /* Other stuff associated with the thread. */
 273         unsigned long cp0_badvaddr;     /* Last user fault */
 274         unsigned long cp0_baduaddr;     /* Last kernel fault accessing USEG */
 275         unsigned long error_code;
 276         unsigned long trap_nr;
 277 #ifdef CONFIG_CPU_CAVIUM_OCTEON
 278         struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));
 279         struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));
 280 #endif
 281 #ifdef CONFIG_CPU_XLP
 282         struct nlm_cop2_state cp2;
 283 #endif
 284         struct mips_abi *abi;
 285 };
 286
 287 #ifdef CONFIG_MIPS_MT_FPAFF
 288 #define FPAFF_INIT                                              \
 289         .emulated_fp                    = 0,                    \
 290         .user_cpus_allowed              = INIT_CPUMASK,
 291 #else
 292 #define FPAFF_INIT
 293 #endif /* CONFIG_MIPS_MT_FPAFF */
 294
 295 #define INIT_THREAD  {                                          \
 296         /*                                                      \
 297          * Saved main processor registers                       \
 298          */                                                     \
 299         .reg16                  = 0,                            \
 300         .reg17                  = 0,                            \
 301         .reg18                  = 0,                            \
 302         .reg19                  = 0,                            \
 303         .reg20                  = 0,                            \
 304         .reg21                  = 0,                            \
 305         .reg22                  = 0,                            \
 306         .reg23                  = 0,                            \
 307         .reg29                  = 0,                            \
 308         .reg30                  = 0,                            \
 309         .reg31                  = 0,                            \
 310         /*                                                      \
 311          * Saved cp0 stuff                                      \
 312          */                                                     \
 313         .cp0_status             = 0,                            \
 314         /*                                                      \
 315          * Saved FPU/FPU emulator stuff                         \
 316          */                                                     \
 317         .fpu                    = {                             \
 318                 .fpr            = {{{0,},},},                   \
 319                 .fcr31          = 0,                            \
 320                 .msacsr         = 0,                            \
 321         },                                                      \
 322         /*                                                      \
 323          * FPU affinity state (null if not FPAFF)               \
 324          */                                                     \
 325         FPAFF_INIT                                              \
 326         /*                                                      \
 327          * Saved DSP stuff                                      \
 328          */                                                     \
 329         .dsp                    = {                             \
 330                 .dspr           = {0, },                        \
 331                 .dspcontrol     = 0,                            \
 332         },                                                      \
 333         /*                                                      \
 334          * saved watch register stuff                           \
 335          */                                                     \
 336         .watch = {{{0,},},},                                    \
 337         /*                                                      \
 338          * Other stuff associated with the process              \
 339          */                                                     \
 340         .cp0_badvaddr           = 0,                            \
 341         .cp0_baduaddr           = 0,                            \
 342         .error_code             = 0,                            \
 343         .trap_nr                = 0,                            \
 344         /*                                                      \
 345          * Platform specific cop2 registers(null if no COP2)    \
 346          */                                                     \
 347         COP2_INIT                                               \
 348 }
 349
 350 struct task_struct;
 351
 352 /* Free all resources held by a thread. */
 353 #define release_thread(thread) do { } while(0)
 354
 355 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 356
 357 /*
 358  * Do necessary setup to start up a newly executed thread.
 359  */
 360 extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
 361
 362 static inline void flush_thread(void)
 363 {
 364 }
 365
 366 unsigned long get_wchan(struct task_struct *p);
 367
 368 #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \
 369                          THREAD_SIZE - 32 - sizeof(struct pt_regs))
 370 #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))
 371 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
 372 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
 373 #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
 374
 375 #define cpu_relax()     barrier()
 376 #define cpu_relax_lowlatency() cpu_relax()
 377
 378 /*
 379  * Return_address is a replacement for __builtin_return_address(count)
 380  * which on certain architectures cannot reasonably be implemented in GCC
 381  * (MIPS, Alpha) or is unusable with -fomit-frame-pointer (i386).
 382  * Note that __builtin_return_address(x>=1) is forbidden because GCC
 383  * aborts compilation on some CPUs.  It's simply not possible to unwind
 384  * some CPU's stackframes.
 385  *
 386  * __builtin_return_address works only for non-leaf functions.  We avoid the
 387  * overhead of a function call by forcing the compiler to save the return
 388  * address register on the stack.
 389  */
 390 #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
 391
 392 #ifdef CONFIG_CPU_HAS_PREFETCH
 393
 394 #define ARCH_HAS_PREFETCH
 395 #define prefetch(x) __builtin_prefetch((x), 0, 1)
 396
 397 #define ARCH_HAS_PREFETCHW
 398 #define prefetchw(x) __builtin_prefetch((x), 1, 1)
 399
 400 #endif
 401
 402 /*
 403  * Functions & macros implementing the PR_GET_FP_MODE & PR_SET_FP_MODE options
 404  * to the prctl syscall.
 405  */
 406 extern int mips_get_process_fp_mode(struct task_struct *task);
 407 extern int mips_set_process_fp_mode(struct task_struct *task,
 408                                     unsigned int value);
 409
 410 #define GET_FP_MODE(task)               mips_get_process_fp_mode(task)
 411 #define SET_FP_MODE(task,value)         mips_set_process_fp_mode(task, value)
 412
 413 #endif /* _ASM_PROCESSOR_H */