arch/powerpc/include/asm/processor.h

   1 #ifndef _ASM_POWERPC_PROCESSOR_H
   2 #define _ASM_POWERPC_PROCESSOR_H
   3
   4 /*
   5  * Copyright (C) 2001 PPC 64 Team, IBM Corp
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 #include <asm/reg.h>
  14
  15 #ifdef CONFIG_VSX
  16 #define TS_FPRWIDTH 2
  17 #else
  18 #define TS_FPRWIDTH 1
  19 #endif
  20
  21 #ifdef CONFIG_PPC64
  22 /* Default SMT priority is set to 3. Use 11- 13bits to save priority. */
  23 #define PPR_PRIORITY 3
  24 #ifdef __ASSEMBLY__
  25 #define INIT_PPR (PPR_PRIORITY << 50)
  26 #else
  27 #define INIT_PPR ((u64)PPR_PRIORITY << 50)
  28 #endif /* __ASSEMBLY__ */
  29 #endif /* CONFIG_PPC64 */
  30
  31 #ifndef __ASSEMBLY__
  32 #include <linux/compiler.h>
  33 #include <linux/cache.h>
  34 #include <asm/ptrace.h>
  35 #include <asm/types.h>
  36 #include <asm/hw_breakpoint.h>
  37
  38 /* We do _not_ want to define new machine types at all, those must die
  39  * in favor of using the device-tree
  40  * -- BenH.
  41  */
  42
  43 /* PREP sub-platform types. Unused */
  44 #define _PREP_Motorola  0x01    /* motorola prep */
  45 #define _PREP_Firm      0x02    /* firmworks prep */
  46 #define _PREP_IBM       0x00    /* ibm prep */
  47 #define _PREP_Bull      0x03    /* bull prep */
  48
  49 /* CHRP sub-platform types. These are arbitrary */
  50 #define _CHRP_Motorola  0x04    /* motorola chrp, the cobra */
  51 #define _CHRP_IBM       0x05    /* IBM chrp, the longtrail and longtrail 2 */
  52 #define _CHRP_Pegasos   0x06    /* Genesi/bplan's Pegasos and Pegasos2 */
  53 #define _CHRP_briq      0x07    /* TotalImpact's briQ */
  54
  55 #if defined(__KERNEL__) && defined(CONFIG_PPC32)
  56
  57 extern int _chrp_type;
  58
  59 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
  60
  61 /*
  62  * Default implementation of macro that returns current
  63  * instruction pointer ("program counter").
  64  */
  65 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  66
  67 /* Macros for adjusting thread priority (hardware multi-threading) */
  68 #define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
  69 #define HMT_low()        asm volatile("or 1,1,1      # low priority")
  70 #define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
  71 #define HMT_medium()     asm volatile("or 2,2,2      # medium priority")
  72 #define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
  73 #define HMT_high()       asm volatile("or 3,3,3      # high priority")
  74
  75 #ifdef __KERNEL__
  76
  77 struct task_struct;
  78 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
  79 void release_thread(struct task_struct *);
  80
  81 /* Lazy FPU handling on uni-processor */
  82 extern struct task_struct *last_task_used_math;
  83 extern struct task_struct *last_task_used_altivec;
  84 extern struct task_struct *last_task_used_vsx;
  85 extern struct task_struct *last_task_used_spe;
  86
  87 #ifdef CONFIG_PPC32
  88
  89 #if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
  90 #error User TASK_SIZE overlaps with KERNEL_START address
  91 #endif
  92 #define TASK_SIZE       (CONFIG_TASK_SIZE)
  93
  94 /* This decides where the kernel will search for a free chunk of vm
  95  * space during mmap's.
  96  */
  97 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
  98 #endif
  99
 100 #ifdef CONFIG_PPC64
 101 /* 64-bit user address space is 46-bits (64TB user VM) */
 102 #define TASK_SIZE_USER64 (0x0000400000000000UL)
 103
 104 /*
 105  * 32-bit user address space is 4GB - 1 page
 106  * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
 107  */
 108 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
 109
 110 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
 111                 TASK_SIZE_USER32 : TASK_SIZE_USER64)
 112 #define TASK_SIZE         TASK_SIZE_OF(current)
 113
 114 /* This decides where the kernel will search for a free chunk of vm
 115  * space during mmap's.
 116  */
 117 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
 118 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
 119
 120 #define TASK_UNMAPPED_BASE ((is_32bit_task()) ? \
 121                 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
 122 #endif
 123
 124 #ifdef __powerpc64__
 125
 126 #define STACK_TOP_USER64 TASK_SIZE_USER64
 127 #define STACK_TOP_USER32 TASK_SIZE_USER32
 128
 129 #define STACK_TOP (is_32bit_task() ? \
 130                    STACK_TOP_USER32 : STACK_TOP_USER64)
 131
 132 #define STACK_TOP_MAX STACK_TOP_USER64
 133
 134 #else /* __powerpc64__ */
 135
 136 #define STACK_TOP TASK_SIZE
 137 #define STACK_TOP_MAX   STACK_TOP
 138
 139 #endif /* __powerpc64__ */
 140
 141 typedef struct {
 142         unsigned long seg;
 143 } mm_segment_t;
 144
 145 #define TS_FPROFFSET 0
 146 #define TS_VSRLOWOFFSET 1
 147 #define TS_FPR(i) fpr[i][TS_FPROFFSET]
 148 #define TS_TRANS_FPR(i) transact_fpr[i][TS_FPROFFSET]
 149
 150 struct thread_struct {
 151         unsigned long   ksp;            /* Kernel stack pointer */
 152         unsigned long   ksp_limit;      /* if ksp <= ksp_limit stack overflow */
 153
 154 #ifdef CONFIG_PPC64
 155         unsigned long   ksp_vsid;
 156 #endif
 157         struct pt_regs  *regs;          /* Pointer to saved register state */
 158         mm_segment_t    fs;             /* for get_fs() validation */
 159 #ifdef CONFIG_BOOKE
 160         /* BookE base exception scratch space; align on cacheline */
 161         unsigned long   normsave[8] ____cacheline_aligned;
 162 #endif
 163 #ifdef CONFIG_PPC32
 164         void            *pgdir;         /* root of page-table tree */
 165 #endif
 166 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 167         /*
 168          * The following help to manage the use of Debug Control Registers
 169          * om the BookE platforms.
 170          */
 171         uint32_t        dbcr0;
 172         uint32_t        dbcr1;
 173 #ifdef CONFIG_BOOKE
 174         uint32_t        dbcr2;
 175 #endif
 176         /*
 177          * The stored value of the DBSR register will be the value at the
 178          * last debug interrupt. This register can only be read from the
 179          * user (will never be written to) and has value while helping to
 180          * describe the reason for the last debug trap.  Torez
 181          */
 182         uint32_t        dbsr;
 183         /*
 184          * The following will contain addresses used by debug applications
 185          * to help trace and trap on particular address locations.
 186          * The bits in the Debug Control Registers above help define which
 187          * of the following registers will contain valid data and/or addresses.
 188          */
 189         unsigned long   iac1;
 190         unsigned long   iac2;
 191 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
 192         unsigned long   iac3;
 193         unsigned long   iac4;
 194 #endif
 195         unsigned long   dac1;
 196         unsigned long   dac2;
 197 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
 198         unsigned long   dvc1;
 199         unsigned long   dvc2;
 200 #endif
 201 #endif
 202         /* FP and VSX 0-31 register set */
 203         double          fpr[32][TS_FPRWIDTH] __attribute__((aligned(16)));
 204         struct {
 205
 206                 unsigned int pad;
 207                 unsigned int val;       /* Floating point status */
 208         } fpscr;
 209         int             fpexc_mode;     /* floating-point exception mode */
 210         unsigned int    align_ctl;      /* alignment handling control */
 211 #ifdef CONFIG_PPC64
 212         unsigned long   start_tb;       /* Start purr when proc switched in */
 213         unsigned long   accum_tb;       /* Total accumilated purr for process */
 214 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 215         struct perf_event *ptrace_bps[HBP_NUM];
 216         /*
 217          * Helps identify source of single-step exception and subsequent
 218          * hw-breakpoint enablement
 219          */
 220         struct perf_event *last_hit_ubp;
 221 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 222 #endif
 223         struct arch_hw_breakpoint hw_brk; /* info on the hardware breakpoint */
 224         unsigned long   trap_nr;        /* last trap # on this thread */
 225 #ifdef CONFIG_ALTIVEC
 226         /* Complete AltiVec register set */
 227         vector128       vr[32] __attribute__((aligned(16)));
 228         /* AltiVec status */
 229         vector128       vscr __attribute__((aligned(16)));
 230         unsigned long   vrsave;
 231         int             used_vr;        /* set if process has used altivec */
 232 #endif /* CONFIG_ALTIVEC */
 233 #ifdef CONFIG_VSX
 234         /* VSR status */
 235         int             used_vsr;       /* set if process has used altivec */
 236 #endif /* CONFIG_VSX */
 237 #ifdef CONFIG_SPE
 238         unsigned long   evr[32];        /* upper 32-bits of SPE regs */
 239         u64             acc;            /* Accumulator */
 240         unsigned long   spefscr;        /* SPE & eFP status */
 241         int             used_spe;       /* set if process has used spe */
 242 #endif /* CONFIG_SPE */
 243 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 244         u64             tm_tfhar;       /* Transaction fail handler addr */
 245         u64             tm_texasr;      /* Transaction exception & summary */
 246         u64             tm_tfiar;       /* Transaction fail instr address reg */
 247         unsigned long   tm_orig_msr;    /* Thread's MSR on ctx switch */
 248         struct pt_regs  ckpt_regs;      /* Checkpointed registers */
 249
 250         unsigned long   tm_tar;
 251         unsigned long   tm_ppr;
 252         unsigned long   tm_dscr;
 253
 254         /*
 255          * Transactional FP and VSX 0-31 register set.
 256          * NOTE: the sense of these is the opposite of the integer ckpt_regs!
 257          *
 258          * When a transaction is active/signalled/scheduled etc., *regs is the
 259          * most recent set of/speculated GPRs with ckpt_regs being the older
 260          * checkpointed regs to which we roll back if transaction aborts.
 261          *
 262          * However, fpr[] is the checkpointed 'base state' of FP regs, and
 263          * transact_fpr[] is the new set of transactional values.
 264          * VRs work the same way.
 265          */
 266         double          transact_fpr[32][TS_FPRWIDTH];
 267         struct {
 268                 unsigned int pad;
 269                 unsigned int val;       /* Floating point status */
 270         } transact_fpscr;
 271         vector128       transact_vr[32] __attribute__((aligned(16)));
 272         vector128       transact_vscr __attribute__((aligned(16)));
 273         unsigned long   transact_vrsave;
 274 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
 275 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
 276         void*           kvm_shadow_vcpu; /* KVM internal data */
 277 #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
 278 #if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
 279         struct kvm_vcpu *kvm_vcpu;
 280 #endif
 281 #ifdef CONFIG_PPC64
 282         unsigned long   dscr;
 283         int             dscr_inherit;
 284         unsigned long   ppr;    /* used to save/restore SMT priority */
 285 #endif
 286 #ifdef CONFIG_PPC_BOOK3S_64
 287         unsigned long   tar;
 288         unsigned long   ebbrr;
 289         unsigned long   ebbhr;
 290         unsigned long   bescr;
 291         unsigned long   siar;
 292         unsigned long   sdar;
 293         unsigned long   sier;
 294         unsigned long   mmcr2;
 295         unsigned        mmcr0;
 296         unsigned        used_ebb;
 297 #endif
 298 };
 299
 300 #define ARCH_MIN_TASKALIGN 16
 301
 302 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 303 #define INIT_SP_LIMIT \
 304         (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
 305
 306 #ifdef CONFIG_SPE
 307 #define SPEFSCR_INIT .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
 308 #else
 309 #define SPEFSCR_INIT
 310 #endif
 311
 312 #ifdef CONFIG_PPC32
 313 #define INIT_THREAD { \
 314         .ksp = INIT_SP, \
 315         .ksp_limit = INIT_SP_LIMIT, \
 316         .fs = KERNEL_DS, \
 317         .pgdir = swapper_pg_dir, \
 318         .fpexc_mode = MSR_FE0 | MSR_FE1, \
 319         SPEFSCR_INIT \
 320 }
 321 #else
 322 #define INIT_THREAD  { \
 323         .ksp = INIT_SP, \
 324         .ksp_limit = INIT_SP_LIMIT, \
 325         .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
 326         .fs = KERNEL_DS, \
 327         .fpr = {{0}}, \
 328         .fpscr = { .val = 0, }, \
 329         .fpexc_mode = 0, \
 330         .ppr = INIT_PPR, \
 331 }
 332 #endif
 333
 334 /*
 335  * Return saved PC of a blocked thread. For now, this is the "user" PC
 336  */
 337 #define thread_saved_pc(tsk)    \
 338         ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 339
 340 #define task_pt_regs(tsk)       ((struct pt_regs *)(tsk)->thread.regs)
 341
 342 unsigned long get_wchan(struct task_struct *p);
 343
 344 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 345 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 346
 347 /* Get/set floating-point exception mode */
 348 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 349 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 350
 351 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 352 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 353
 354 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
 355 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
 356
 357 extern int get_endian(struct task_struct *tsk, unsigned long adr);
 358 extern int set_endian(struct task_struct *tsk, unsigned int val);
 359
 360 #define GET_UNALIGN_CTL(tsk, adr)       get_unalign_ctl((tsk), (adr))
 361 #define SET_UNALIGN_CTL(tsk, val)       set_unalign_ctl((tsk), (val))
 362
 363 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
 364 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
 365
 366 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
 367 {
 368         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 369 }
 370
 371 static inline unsigned long __pack_fe01(unsigned int fpmode)
 372 {
 373         return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 374 }
 375
 376 #ifdef CONFIG_PPC64
 377 #define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
 378 #else
 379 #define cpu_relax()     barrier()
 380 #endif
 381
 382 /* Check that a certain kernel stack pointer is valid in task_struct p */
 383 int validate_sp(unsigned long sp, struct task_struct *p,
 384                        unsigned long nbytes);
 385
 386 /*
 387  * Prefetch macros.
 388  */
 389 #define ARCH_HAS_PREFETCH
 390 #define ARCH_HAS_PREFETCHW
 391 #define ARCH_HAS_SPINLOCK_PREFETCH
 392
 393 static inline void prefetch(const void *x)
 394 {
 395         if (unlikely(!x))
 396                 return;
 397
 398         __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
 399 }
 400
 401 static inline void prefetchw(const void *x)
 402 {
 403         if (unlikely(!x))
 404                 return;
 405
 406         __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
 407 }
 408
 409 #define spin_lock_prefetch(x)   prefetchw(x)
 410
 411 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 412
 413 #ifdef CONFIG_PPC64
 414 static inline unsigned long get_clean_sp(unsigned long sp, int is_32)
 415 {
 416         if (is_32)
 417                 return sp & 0x0ffffffffUL;
 418         return sp;
 419 }
 420 #else
 421 static inline unsigned long get_clean_sp(unsigned long sp, int is_32)
 422 {
 423         return sp;
 424 }
 425 #endif
 426
 427 extern unsigned long cpuidle_disable;
 428 enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
 429
 430 extern int powersave_nap;       /* set if nap mode can be used in idle loop */
 431 extern void power7_nap(void);
 432
 433 #ifdef CONFIG_PSERIES_IDLE
 434 extern void update_smt_snooze_delay(int cpu, int residency);
 435 #else
 436 static inline void update_smt_snooze_delay(int cpu, int residency) {}
 437 #endif
 438
 439 extern void flush_instruction_cache(void);
 440 extern void hard_reset_now(void);
 441 extern void poweroff_now(void);
 442 extern int fix_alignment(struct pt_regs *);
 443 extern void cvt_fd(float *from, double *to);
 444 extern void cvt_df(double *from, float *to);
 445 extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
 446
 447 #ifdef CONFIG_PPC64
 448 /*
 449  * We handle most unaligned accesses in hardware. On the other hand
 450  * unaligned DMA can be very expensive on some ppc64 IO chips (it does
 451  * powers of 2 writes until it reaches sufficient alignment).
 452  *
 453  * Based on this we disable the IP header alignment in network drivers.
 454  */
 455 #define NET_IP_ALIGN    0
 456 #endif
 457
 458 #endif /* __KERNEL__ */
 459 #endif /* __ASSEMBLY__ */
 460 #endif /* _ASM_POWERPC_PROCESSOR_H */