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 /*
  40  * A special page (the vdso) is mapped into all processes at the very
  41  * top of the virtual memory space.
  42  */
  43 #define SPECIAL_PAGES_SIZE PAGE_SIZE
  44
  45 #ifdef CONFIG_32BIT
  46 #ifdef CONFIG_KVM_GUEST
  47 /* User space process size is limited to 1GB in KVM Guest Mode */
  48 #define TASK_SIZE       0x3fff8000UL
  49 #else
  50 /*
  51  * User space process size: 2GB. This is hardcoded into a few places,
  52  * so don't change it unless you know what you are doing.
  53  */
  54 #define TASK_SIZE       0x7fff8000UL
  55 #endif
  56
  57 #ifdef __KERNEL__
  58 #define STACK_TOP_MAX   TASK_SIZE
  59 #endif
  60
  61 #define TASK_IS_32BIT_ADDR 1
  62
  63 #endif
  64
  65 #ifdef CONFIG_64BIT
  66 /*
  67  * User space process size: 1TB. This is hardcoded into a few places,
  68  * so don't change it unless you know what you are doing.  TASK_SIZE
  69  * is limited to 1TB by the R4000 architecture; R10000 and better can
  70  * support 16TB; the architectural reserve for future expansion is
  71  * 8192EB ...
  72  */
  73 #define TASK_SIZE32     0x7fff8000UL
  74 #define TASK_SIZE64     0x10000000000UL
  75 #define TASK_SIZE (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
  76
  77 #ifdef __KERNEL__
  78 #define STACK_TOP_MAX   TASK_SIZE64
  79 #endif
  80
  81
  82 #define TASK_SIZE_OF(tsk)                                               \
  83         (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE64)
  84
  85 #define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)
  86
  87 #endif
  88
  89 #define STACK_TOP       ((TASK_SIZE & PAGE_MASK) - SPECIAL_PAGES_SIZE)
  90
  91 /*
  92  * This decides where the kernel will search for a free chunk of vm
  93  * space during mmap's.
  94  */
  95 #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
  96
  97
  98 #define NUM_FPU_REGS    32
  99
 100 #ifdef CONFIG_CPU_HAS_MSA
 101 # define FPU_REG_WIDTH  128
 102 #else
 103 # define FPU_REG_WIDTH  64
 104 #endif
 105
 106 union fpureg {
 107         __u32   val32[FPU_REG_WIDTH / 32];
 108         __u64   val64[FPU_REG_WIDTH / 64];
 109 };
 110
 111 #ifdef CONFIG_CPU_LITTLE_ENDIAN
 112 # define FPR_IDX(width, idx)    (idx)
 113 #else
 114 # define FPR_IDX(width, idx)    ((FPU_REG_WIDTH / (width)) - 1 - (idx))
 115 #endif
 116
 117 #define BUILD_FPR_ACCESS(width) \
 118 static inline u##width get_fpr##width(union fpureg *fpr, unsigned idx)  \
 119 {                                                                       \
 120         return fpr->val##width[FPR_IDX(width, idx)];                    \
 121 }                                                                       \
 122                                                                         \
 123 static inline void set_fpr##width(union fpureg *fpr, unsigned idx,      \
 124                                   u##width val)                         \
 125 {                                                                       \
 126         fpr->val##width[FPR_IDX(width, idx)] = val;                     \
 127 }
 128
 129 BUILD_FPR_ACCESS(32)
 130 BUILD_FPR_ACCESS(64)
 131
 132 /*
 133  * It would be nice to add some more fields for emulator statistics,
 134  * the additional information is private to the FPU emulator for now.
 135  * See arch/mips/include/asm/fpu_emulator.h.
 136  */
 137
 138 struct mips_fpu_struct {
 139         union fpureg    fpr[NUM_FPU_REGS];
 140         unsigned int    fcr31;
 141         unsigned int    msacsr;
 142 };
 143
 144 #define NUM_DSP_REGS   6
 145
 146 typedef __u32 dspreg_t;
 147
 148 struct mips_dsp_state {
 149         dspreg_t        dspr[NUM_DSP_REGS];
 150         unsigned int    dspcontrol;
 151 };
 152
 153 #define INIT_CPUMASK { \
 154         {0,} \
 155 }
 156
 157 struct mips3264_watch_reg_state {
 158         /* The width of watchlo is 32 in a 32 bit kernel and 64 in a
 159            64 bit kernel.  We use unsigned long as it has the same
 160            property. */
 161         unsigned long watchlo[NUM_WATCH_REGS];
 162         /* Only the mask and IRW bits from watchhi. */
 163         u16 watchhi[NUM_WATCH_REGS];
 164 };
 165
 166 union mips_watch_reg_state {
 167         struct mips3264_watch_reg_state mips3264;
 168 };
 169
 170 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 171
 172 struct octeon_cop2_state {
 173         /* DMFC2 rt, 0x0201 */
 174         unsigned long   cop2_crc_iv;
 175         /* DMFC2 rt, 0x0202 (Set with DMTC2 rt, 0x1202) */
 176         unsigned long   cop2_crc_length;
 177         /* DMFC2 rt, 0x0200 (set with DMTC2 rt, 0x4200) */
 178         unsigned long   cop2_crc_poly;
 179         /* DMFC2 rt, 0x0402; DMFC2 rt, 0x040A */
 180         unsigned long   cop2_llm_dat[2];
 181        /* DMFC2 rt, 0x0084 */
 182         unsigned long   cop2_3des_iv;
 183         /* DMFC2 rt, 0x0080; DMFC2 rt, 0x0081; DMFC2 rt, 0x0082 */
 184         unsigned long   cop2_3des_key[3];
 185         /* DMFC2 rt, 0x0088 (Set with DMTC2 rt, 0x0098) */
 186         unsigned long   cop2_3des_result;
 187         /* DMFC2 rt, 0x0111 (FIXME: Read Pass1 Errata) */
 188         unsigned long   cop2_aes_inp0;
 189         /* DMFC2 rt, 0x0102; DMFC2 rt, 0x0103 */
 190         unsigned long   cop2_aes_iv[2];
 191         /* DMFC2 rt, 0x0104; DMFC2 rt, 0x0105; DMFC2 rt, 0x0106; DMFC2
 192          * rt, 0x0107 */
 193         unsigned long   cop2_aes_key[4];
 194         /* DMFC2 rt, 0x0110 */
 195         unsigned long   cop2_aes_keylen;
 196         /* DMFC2 rt, 0x0100; DMFC2 rt, 0x0101 */
 197         unsigned long   cop2_aes_result[2];
 198         /* DMFC2 rt, 0x0240; DMFC2 rt, 0x0241; DMFC2 rt, 0x0242; DMFC2
 199          * rt, 0x0243; DMFC2 rt, 0x0244; DMFC2 rt, 0x0245; DMFC2 rt,
 200          * 0x0246; DMFC2 rt, 0x0247; DMFC2 rt, 0x0248; DMFC2 rt,
 201          * 0x0249; DMFC2 rt, 0x024A; DMFC2 rt, 0x024B; DMFC2 rt,
 202          * 0x024C; DMFC2 rt, 0x024D; DMFC2 rt, 0x024E - Pass2 */
 203         unsigned long   cop2_hsh_datw[15];
 204         /* DMFC2 rt, 0x0250; DMFC2 rt, 0x0251; DMFC2 rt, 0x0252; DMFC2
 205          * rt, 0x0253; DMFC2 rt, 0x0254; DMFC2 rt, 0x0255; DMFC2 rt,
 206          * 0x0256; DMFC2 rt, 0x0257 - Pass2 */
 207         unsigned long   cop2_hsh_ivw[8];
 208         /* DMFC2 rt, 0x0258; DMFC2 rt, 0x0259 - Pass2 */
 209         unsigned long   cop2_gfm_mult[2];
 210         /* DMFC2 rt, 0x025E - Pass2 */
 211         unsigned long   cop2_gfm_poly;
 212         /* DMFC2 rt, 0x025A; DMFC2 rt, 0x025B - Pass2 */
 213         unsigned long   cop2_gfm_result[2];
 214 };
 215 #define COP2_INIT                                               \
 216         .cp2                    = {0,},
 217
 218 struct octeon_cvmseg_state {
 219         unsigned long cvmseg[CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE]
 220                             [cpu_dcache_line_size() / sizeof(unsigned long)];
 221 };
 222
 223 #elif defined(CONFIG_CPU_XLP)
 224 struct nlm_cop2_state {
 225         u64     rx[4];
 226         u64     tx[4];
 227         u32     tx_msg_status;
 228         u32     rx_msg_status;
 229 };
 230
 231 #define COP2_INIT                                               \
 232         .cp2                    = {{0}, {0}, 0, 0},
 233 #else
 234 #define COP2_INIT
 235 #endif
 236
 237 typedef struct {
 238         unsigned long seg;
 239 } mm_segment_t;
 240
 241 #define ARCH_MIN_TASKALIGN      8
 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;
 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 #ifdef CONFIG_CPU_CAVIUM_OCTEON
 277         struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));
 278         struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));
 279 #endif
 280 #ifdef CONFIG_CPU_XLP
 281         struct nlm_cop2_state cp2;
 282 #endif
 283         struct mips_abi *abi;
 284 };
 285
 286 #ifdef CONFIG_MIPS_MT_FPAFF
 287 #define FPAFF_INIT                                              \
 288         .emulated_fp                    = 0,                    \
 289         .user_cpus_allowed              = INIT_CPUMASK,
 290 #else
 291 #define FPAFF_INIT
 292 #endif /* CONFIG_MIPS_MT_FPAFF */
 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                    = {                             \
 317                 .fpr            = {{{0,},},},                   \
 318                 .fcr31          = 0,                            \
 319                 .msacsr         = 0,                            \
 320         },                                                      \
 321         /*                                                      \
 322          * FPU affinity state (null if not FPAFF)               \
 323          */                                                     \
 324         FPAFF_INIT                                              \
 325         /*                                                      \
 326          * Saved DSP stuff                                      \
 327          */                                                     \
 328         .dsp                    = {                             \
 329                 .dspr           = {0, },                        \
 330                 .dspcontrol     = 0,                            \
 331         },                                                      \
 332         /*                                                      \
 333          * saved watch register stuff                           \
 334          */                                                     \
 335         .watch = {{{0,},},},                                    \
 336         /*                                                      \
 337          * Other stuff associated with the process              \
 338          */                                                     \
 339         .cp0_badvaddr           = 0,                            \
 340         .cp0_baduaddr           = 0,                            \
 341         .error_code             = 0,                            \
 342         /*                                                      \
 343          * Platform specific cop2 registers(null if no COP2)    \
 344          */                                                     \
 345         COP2_INIT                                               \
 346 }
 347
 348 struct task_struct;
 349
 350 /* Free all resources held by a thread. */
 351 #define release_thread(thread) do { } while(0)
 352
 353 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 354
 355 /*
 356  * Do necessary setup to start up a newly executed thread.
 357  */
 358 extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
 359
 360 unsigned long get_wchan(struct task_struct *p);
 361
 362 #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \
 363                          THREAD_SIZE - 32 - sizeof(struct pt_regs))
 364 #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))
 365 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
 366 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
 367 #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
 368
 369 #define cpu_relax()     barrier()
 370
 371 /*
 372  * Return_address is a replacement for __builtin_return_address(count)
 373  * which on certain architectures cannot reasonably be implemented in GCC
 374  * (MIPS, Alpha) or is unusable with -fomit-frame-pointer (i386).
 375  * Note that __builtin_return_address(x>=1) is forbidden because GCC
 376  * aborts compilation on some CPUs.  It's simply not possible to unwind
 377  * some CPU's stackframes.
 378  *
 379  * __builtin_return_address works only for non-leaf functions.  We avoid the
 380  * overhead of a function call by forcing the compiler to save the return
 381  * address register on the stack.
 382  */
 383 #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
 384
 385 #ifdef CONFIG_CPU_HAS_PREFETCH
 386
 387 #define ARCH_HAS_PREFETCH
 388 #define prefetch(x) __builtin_prefetch((x), 0, 1)
 389
 390 #define ARCH_HAS_PREFETCHW
 391 #define prefetchw(x) __builtin_prefetch((x), 1, 1)
 392
 393 /*
 394  * See Documentation/scheduler/sched-arch.txt; prevents deadlock on SMP
 395  * systems.
 396  */
 397 #define __ARCH_WANT_UNLOCKED_CTXSW
 398
 399 #endif
 400
 401 #endif /* _ASM_PROCESSOR_H */