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 #include <asm/system.h>
  23
  24 /*
  25  * Return current * instruction pointer ("program counter").
  26  */
  27 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  28
  29 /*
  30  * System setup and hardware flags..
  31  */
  32 extern void (*cpu_wait)(void);
  33
  34 extern unsigned int vced_count, vcei_count;
  35
  36 #ifdef CONFIG_32BIT
  37 /*
  38  * User space process size: 2GB. This is hardcoded into a few places,
  39  * so don't change it unless you know what you are doing.
  40  */
  41 #define TASK_SIZE       0x7fff8000UL
  42 #define STACK_TOP       TASK_SIZE
  43
  44 /*
  45  * This decides where the kernel will search for a free chunk of vm
  46  * space during mmap's.
  47  */
  48 #define TASK_UNMAPPED_BASE      ((TASK_SIZE / 3) & ~(PAGE_SIZE))
  49 #endif
  50
  51 #ifdef CONFIG_64BIT
  52 /*
  53  * User space process size: 1TB. This is hardcoded into a few places,
  54  * so don't change it unless you know what you are doing.  TASK_SIZE
  55  * is limited to 1TB by the R4000 architecture; R10000 and better can
  56  * support 16TB; the architectural reserve for future expansion is
  57  * 8192EB ...
  58  */
  59 #define TASK_SIZE32     0x7fff8000UL
  60 #define TASK_SIZE       0x10000000000UL
  61 #define STACK_TOP       \
  62       (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
  63
  64 /*
  65  * This decides where the kernel will search for a free chunk of vm
  66  * space during mmap's.
  67  */
  68 #define TASK_UNMAPPED_BASE                                              \
  69         (test_thread_flag(TIF_32BIT_ADDR) ?                             \
  70                 PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
  71 #define TASK_SIZE_OF(tsk)                                               \
  72         (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
  73 #endif
  74
  75 #ifdef __KERNEL__
  76 #define STACK_TOP_MAX   TASK_SIZE
  77 #endif
  78
  79 #define NUM_FPU_REGS    32
  80
  81 typedef __u64 fpureg_t;
  82
  83 /*
  84  * It would be nice to add some more fields for emulator statistics, but there
  85  * are a number of fixed offsets in offset.h and elsewhere that would have to
  86  * be recalculated by hand.  So the additional information will be private to
  87  * the FPU emulator for now.  See asm-mips/fpu_emulator.h.
  88  */
  89
  90 struct mips_fpu_struct {
  91         fpureg_t        fpr[NUM_FPU_REGS];
  92         unsigned int    fcr31;
  93 };
  94
  95 #define NUM_DSP_REGS   6
  96
  97 typedef __u32 dspreg_t;
  98
  99 struct mips_dsp_state {
 100         dspreg_t        dspr[NUM_DSP_REGS];
 101         unsigned int    dspcontrol;
 102 };
 103
 104 #define INIT_CPUMASK { \
 105         {0,} \
 106 }
 107
 108 struct mips3264_watch_reg_state {
 109         /* The width of watchlo is 32 in a 32 bit kernel and 64 in a
 110            64 bit kernel.  We use unsigned long as it has the same
 111            property. */
 112         unsigned long watchlo[NUM_WATCH_REGS];
 113         /* Only the mask and IRW bits from watchhi. */
 114         u16 watchhi[NUM_WATCH_REGS];
 115 };
 116
 117 union mips_watch_reg_state {
 118         struct mips3264_watch_reg_state mips3264;
 119 };
 120
 121 #ifdef CONFIG_CPU_CAVIUM_OCTEON
 122
 123 struct octeon_cop2_state {
 124         /* DMFC2 rt, 0x0201 */
 125         unsigned long   cop2_crc_iv;
 126         /* DMFC2 rt, 0x0202 (Set with DMTC2 rt, 0x1202) */
 127         unsigned long   cop2_crc_length;
 128         /* DMFC2 rt, 0x0200 (set with DMTC2 rt, 0x4200) */
 129         unsigned long   cop2_crc_poly;
 130         /* DMFC2 rt, 0x0402; DMFC2 rt, 0x040A */
 131         unsigned long   cop2_llm_dat[2];
 132        /* DMFC2 rt, 0x0084 */
 133         unsigned long   cop2_3des_iv;
 134         /* DMFC2 rt, 0x0080; DMFC2 rt, 0x0081; DMFC2 rt, 0x0082 */
 135         unsigned long   cop2_3des_key[3];
 136         /* DMFC2 rt, 0x0088 (Set with DMTC2 rt, 0x0098) */
 137         unsigned long   cop2_3des_result;
 138         /* DMFC2 rt, 0x0111 (FIXME: Read Pass1 Errata) */
 139         unsigned long   cop2_aes_inp0;
 140         /* DMFC2 rt, 0x0102; DMFC2 rt, 0x0103 */
 141         unsigned long   cop2_aes_iv[2];
 142         /* DMFC2 rt, 0x0104; DMFC2 rt, 0x0105; DMFC2 rt, 0x0106; DMFC2
 143          * rt, 0x0107 */
 144         unsigned long   cop2_aes_key[4];
 145         /* DMFC2 rt, 0x0110 */
 146         unsigned long   cop2_aes_keylen;
 147         /* DMFC2 rt, 0x0100; DMFC2 rt, 0x0101 */
 148         unsigned long   cop2_aes_result[2];
 149         /* DMFC2 rt, 0x0240; DMFC2 rt, 0x0241; DMFC2 rt, 0x0242; DMFC2
 150          * rt, 0x0243; DMFC2 rt, 0x0244; DMFC2 rt, 0x0245; DMFC2 rt,
 151          * 0x0246; DMFC2 rt, 0x0247; DMFC2 rt, 0x0248; DMFC2 rt,
 152          * 0x0249; DMFC2 rt, 0x024A; DMFC2 rt, 0x024B; DMFC2 rt,
 153          * 0x024C; DMFC2 rt, 0x024D; DMFC2 rt, 0x024E - Pass2 */
 154         unsigned long   cop2_hsh_datw[15];
 155         /* DMFC2 rt, 0x0250; DMFC2 rt, 0x0251; DMFC2 rt, 0x0252; DMFC2
 156          * rt, 0x0253; DMFC2 rt, 0x0254; DMFC2 rt, 0x0255; DMFC2 rt,
 157          * 0x0256; DMFC2 rt, 0x0257 - Pass2 */
 158         unsigned long   cop2_hsh_ivw[8];
 159         /* DMFC2 rt, 0x0258; DMFC2 rt, 0x0259 - Pass2 */
 160         unsigned long   cop2_gfm_mult[2];
 161         /* DMFC2 rt, 0x025E - Pass2 */
 162         unsigned long   cop2_gfm_poly;
 163         /* DMFC2 rt, 0x025A; DMFC2 rt, 0x025B - Pass2 */
 164         unsigned long   cop2_gfm_result[2];
 165 };
 166 #define INIT_OCTEON_COP2 {0,}
 167
 168 struct octeon_cvmseg_state {
 169         unsigned long cvmseg[CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE]
 170                             [cpu_dcache_line_size() / sizeof(unsigned long)];
 171 };
 172
 173 #endif
 174
 175 typedef struct {
 176         unsigned long seg;
 177 } mm_segment_t;
 178
 179 #define ARCH_MIN_TASKALIGN      8
 180
 181 struct mips_abi;
 182
 183 /*
 184  * If you change thread_struct remember to change the #defines below too!
 185  */
 186 struct thread_struct {
 187         /* Saved main processor registers. */
 188         unsigned long reg16;
 189         unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
 190         unsigned long reg29, reg30, reg31;
 191
 192         /* Saved cp0 stuff. */
 193         unsigned long cp0_status;
 194
 195         /* Saved fpu/fpu emulator stuff. */
 196         struct mips_fpu_struct fpu;
 197 #ifdef CONFIG_MIPS_MT_FPAFF
 198         /* Emulated instruction count */
 199         unsigned long emulated_fp;
 200         /* Saved per-thread scheduler affinity mask */
 201         cpumask_t user_cpus_allowed;
 202 #endif /* CONFIG_MIPS_MT_FPAFF */
 203
 204         /* Saved state of the DSP ASE, if available. */
 205         struct mips_dsp_state dsp;
 206
 207         /* Saved watch register state, if available. */
 208         union mips_watch_reg_state watch;
 209
 210         /* Other stuff associated with the thread. */
 211         unsigned long cp0_badvaddr;     /* Last user fault */
 212         unsigned long cp0_baduaddr;     /* Last kernel fault accessing USEG */
 213         unsigned long error_code;
 214         unsigned long trap_no;
 215         unsigned long irix_trampoline;  /* Wheee... */
 216         unsigned long irix_oldctx;
 217 #ifdef CONFIG_CPU_CAVIUM_OCTEON
 218     struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));
 219     struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));
 220 #endif
 221         struct mips_abi *abi;
 222 };
 223
 224 #ifdef CONFIG_MIPS_MT_FPAFF
 225 #define FPAFF_INIT                                              \
 226         .emulated_fp                    = 0,                    \
 227         .user_cpus_allowed              = INIT_CPUMASK,
 228 #else
 229 #define FPAFF_INIT
 230 #endif /* CONFIG_MIPS_MT_FPAFF */
 231
 232 #ifdef CONFIG_CPU_CAVIUM_OCTEON
 233 #define OCTEON_INIT                                             \
 234         .cp2                    = INIT_OCTEON_COP2,
 235 #else
 236 #define OCTEON_INIT
 237 #endif /* CONFIG_CPU_CAVIUM_OCTEON */
 238
 239 #define INIT_THREAD  {                                          \
 240         /*                                                      \
 241          * Saved main processor registers                       \
 242          */                                                     \
 243         .reg16                  = 0,                            \
 244         .reg17                  = 0,                            \
 245         .reg18                  = 0,                            \
 246         .reg19                  = 0,                            \
 247         .reg20                  = 0,                            \
 248         .reg21                  = 0,                            \
 249         .reg22                  = 0,                            \
 250         .reg23                  = 0,                            \
 251         .reg29                  = 0,                            \
 252         .reg30                  = 0,                            \
 253         .reg31                  = 0,                            \
 254         /*                                                      \
 255          * Saved cp0 stuff                                      \
 256          */                                                     \
 257         .cp0_status             = 0,                            \
 258         /*                                                      \
 259          * Saved FPU/FPU emulator stuff                         \
 260          */                                                     \
 261         .fpu                    = {                             \
 262                 .fpr            = {0,},                         \
 263                 .fcr31          = 0,                            \
 264         },                                                      \
 265         /*                                                      \
 266          * FPU affinity state (null if not FPAFF)               \
 267          */                                                     \
 268         FPAFF_INIT                                              \
 269         /*                                                      \
 270          * Saved DSP stuff                                      \
 271          */                                                     \
 272         .dsp                    = {                             \
 273                 .dspr           = {0, },                        \
 274                 .dspcontrol     = 0,                            \
 275         },                                                      \
 276         /*                                                      \
 277          * saved watch register stuff                           \
 278          */                                                     \
 279         .watch = {{{0,},},},                                    \
 280         /*                                                      \
 281          * Other stuff associated with the process              \
 282          */                                                     \
 283         .cp0_badvaddr           = 0,                            \
 284         .cp0_baduaddr           = 0,                            \
 285         .error_code             = 0,                            \
 286         .trap_no                = 0,                            \
 287         .irix_trampoline        = 0,                            \
 288         .irix_oldctx            = 0,                            \
 289         /*                                                      \
 290          * Cavium Octeon specifics (null if not Octeon)         \
 291          */                                                     \
 292         OCTEON_INIT                                             \
 293 }
 294
 295 struct task_struct;
 296
 297 /* Free all resources held by a thread. */
 298 #define release_thread(thread) do { } while(0)
 299
 300 /* Prepare to copy thread state - unlazy all lazy status */
 301 #define prepare_to_copy(tsk)    do { } while (0)
 302
 303 extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 304
 305 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 306
 307 /*
 308  * Do necessary setup to start up a newly executed thread.
 309  */
 310 extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
 311
 312 unsigned long get_wchan(struct task_struct *p);
 313
 314 #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \
 315                          THREAD_SIZE - 32 - sizeof(struct pt_regs))
 316 #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk))
 317 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
 318 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
 319 #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
 320
 321 #define cpu_relax()     barrier()
 322
 323 /*
 324  * Return_address is a replacement for __builtin_return_address(count)
 325  * which on certain architectures cannot reasonably be implemented in GCC
 326  * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
 327  * Note that __builtin_return_address(x>=1) is forbidden because GCC
 328  * aborts compilation on some CPUs.  It's simply not possible to unwind
 329  * some CPU's stackframes.
 330  *
 331  * __builtin_return_address works only for non-leaf functions.  We avoid the
 332  * overhead of a function call by forcing the compiler to save the return
 333  * address register on the stack.
 334  */
 335 #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
 336
 337 #ifdef CONFIG_CPU_HAS_PREFETCH
 338
 339 #define ARCH_HAS_PREFETCH
 340
 341 static inline void prefetch(const void *addr)
 342 {
 343         __asm__ __volatile__(
 344         "       .set    mips4           \n"
 345         "       pref    %0, (%1)        \n"
 346         "       .set    mips0           \n"
 347         :
 348         : "i" (Pref_Load), "r" (addr));
 349 }
 350
 351 #endif
 352
 353 #endif /* _ASM_PROCESSOR_H */