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 #ifndef __ASSEMBLY__
  22 #include <linux/compiler.h>
  23 #include <linux/cache.h>
  24 #include <asm/ptrace.h>
  25 #include <asm/types.h>
  26
  27 /* We do _not_ want to define new machine types at all, those must die
  28  * in favor of using the device-tree
  29  * -- BenH.
  30  */
  31
  32 /* PREP sub-platform types see residual.h for these */
  33 #define _PREP_Motorola  0x01    /* motorola prep */
  34 #define _PREP_Firm      0x02    /* firmworks prep */
  35 #define _PREP_IBM       0x00    /* ibm prep */
  36 #define _PREP_Bull      0x03    /* bull prep */
  37
  38 /* CHRP sub-platform types. These are arbitrary */
  39 #define _CHRP_Motorola  0x04    /* motorola chrp, the cobra */
  40 #define _CHRP_IBM       0x05    /* IBM chrp, the longtrail and longtrail 2 */
  41 #define _CHRP_Pegasos   0x06    /* Genesi/bplan's Pegasos and Pegasos2 */
  42 #define _CHRP_briq      0x07    /* TotalImpact's briQ */
  43
  44 #if defined(__KERNEL__) && defined(CONFIG_PPC32)
  45
  46 extern int _chrp_type;
  47
  48 #ifdef CONFIG_PPC_PREP
  49
  50 /* what kind of prep workstation we are */
  51 extern int _prep_type;
  52
  53 #endif /* CONFIG_PPC_PREP */
  54
  55 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
  56
  57 /*
  58  * Default implementation of macro that returns current
  59  * instruction pointer ("program counter").
  60  */
  61 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  62
  63 /* Macros for adjusting thread priority (hardware multi-threading) */
  64 #define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
  65 #define HMT_low()        asm volatile("or 1,1,1      # low priority")
  66 #define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
  67 #define HMT_medium()     asm volatile("or 2,2,2      # medium priority")
  68 #define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
  69 #define HMT_high()       asm volatile("or 3,3,3      # high priority")
  70
  71 #ifdef __KERNEL__
  72
  73 struct task_struct;
  74 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
  75 void release_thread(struct task_struct *);
  76
  77 /* Prepare to copy thread state - unlazy all lazy status */
  78 extern void prepare_to_copy(struct task_struct *tsk);
  79
  80 /* Create a new kernel thread. */
  81 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  82
  83 /* Lazy FPU handling on uni-processor */
  84 extern struct task_struct *last_task_used_math;
  85 extern struct task_struct *last_task_used_altivec;
  86 extern struct task_struct *last_task_used_vsx;
  87 extern struct task_struct *last_task_used_spe;
  88
  89 #ifdef CONFIG_PPC32
  90
  91 #if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
  92 #error User TASK_SIZE overlaps with KERNEL_START address
  93 #endif
  94 #define TASK_SIZE       (CONFIG_TASK_SIZE)
  95
  96 /* This decides where the kernel will search for a free chunk of vm
  97  * space during mmap's.
  98  */
  99 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
 100 #endif
 101
 102 #ifdef CONFIG_PPC64
 103 /* 64-bit user address space is 44-bits (16TB user VM) */
 104 #define TASK_SIZE_USER64 (0x0000100000000000UL)
 105
 106 /*
 107  * 32-bit user address space is 4GB - 1 page
 108  * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
 109  */
 110 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
 111
 112 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
 113                 TASK_SIZE_USER32 : TASK_SIZE_USER64)
 114 #define TASK_SIZE         TASK_SIZE_OF(current)
 115
 116 /* This decides where the kernel will search for a free chunk of vm
 117  * space during mmap's.
 118  */
 119 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
 120 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
 121
 122 #define TASK_UNMAPPED_BASE ((is_32bit_task()) ? \
 123                 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
 124 #endif
 125
 126 #ifdef __powerpc64__
 127
 128 #define STACK_TOP_USER64 TASK_SIZE_USER64
 129 #define STACK_TOP_USER32 TASK_SIZE_USER32
 130
 131 #define STACK_TOP (is_32bit_task() ? \
 132                    STACK_TOP_USER32 : STACK_TOP_USER64)
 133
 134 #define STACK_TOP_MAX STACK_TOP_USER64
 135
 136 #else /* __powerpc64__ */
 137
 138 #define STACK_TOP TASK_SIZE
 139 #define STACK_TOP_MAX   STACK_TOP
 140
 141 #endif /* __powerpc64__ */
 142
 143 typedef struct {
 144         unsigned long seg;
 145 } mm_segment_t;
 146
 147 #define TS_FPROFFSET 0
 148 #define TS_VSRLOWOFFSET 1
 149 #define TS_FPR(i) fpr[i][TS_FPROFFSET]
 150
 151 struct thread_struct {
 152         unsigned long   ksp;            /* Kernel stack pointer */
 153         unsigned long   ksp_limit;      /* if ksp <= ksp_limit stack overflow */
 154
 155 #ifdef CONFIG_PPC64
 156         unsigned long   ksp_vsid;
 157 #endif
 158         struct pt_regs  *regs;          /* Pointer to saved register state */
 159         mm_segment_t    fs;             /* for get_fs() validation */
 160 #ifdef CONFIG_BOOKE
 161         /* BookE base exception scratch space; align on cacheline */
 162         unsigned long   normsave[8] ____cacheline_aligned;
 163 #endif
 164 #ifdef CONFIG_PPC32
 165         void            *pgdir;         /* root of page-table tree */
 166 #endif
 167 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 168         /*
 169          * The following help to manage the use of Debug Control Registers
 170          * om the BookE platforms.
 171          */
 172         unsigned long   dbcr0;
 173         unsigned long   dbcr1;
 174 #ifdef CONFIG_BOOKE
 175         unsigned long   dbcr2;
 176 #endif
 177         /*
 178          * The stored value of the DBSR register will be the value at the
 179          * last debug interrupt. This register can only be read from the
 180          * user (will never be written to) and has value while helping to
 181          * describe the reason for the last debug trap.  Torez
 182          */
 183         unsigned long   dbsr;
 184         /*
 185          * The following will contain addresses used by debug applications
 186          * to help trace and trap on particular address locations.
 187          * The bits in the Debug Control Registers above help define which
 188          * of the following registers will contain valid data and/or addresses.
 189          */
 190         unsigned long   iac1;
 191         unsigned long   iac2;
 192 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
 193         unsigned long   iac3;
 194         unsigned long   iac4;
 195 #endif
 196         unsigned long   dac1;
 197         unsigned long   dac2;
 198 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
 199         unsigned long   dvc1;
 200         unsigned long   dvc2;
 201 #endif
 202 #endif
 203         /* FP and VSX 0-31 register set */
 204         double          fpr[32][TS_FPRWIDTH];
 205         struct {
 206
 207                 unsigned int pad;
 208                 unsigned int val;       /* Floating point status */
 209         } fpscr;
 210         int             fpexc_mode;     /* floating-point exception mode */
 211         unsigned int    align_ctl;      /* alignment handling control */
 212 #ifdef CONFIG_PPC64
 213         unsigned long   start_tb;       /* Start purr when proc switched in */
 214         unsigned long   accum_tb;       /* Total accumilated purr for process */
 215 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 216         struct perf_event *ptrace_bps[HBP_NUM];
 217         /*
 218          * Helps identify source of single-step exception and subsequent
 219          * hw-breakpoint enablement
 220          */
 221         struct perf_event *last_hit_ubp;
 222 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 223 #endif
 224         unsigned long   dabr;           /* Data address breakpoint register */
 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_KVM_BOOK3S_32_HANDLER
 244         void*           kvm_shadow_vcpu; /* KVM internal data */
 245 #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
 246 #ifdef CONFIG_PPC64
 247         unsigned long   dscr;
 248         int             dscr_inherit;
 249 #endif
 250 };
 251
 252 #define ARCH_MIN_TASKALIGN 16
 253
 254 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 255 #define INIT_SP_LIMIT \
 256         (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
 257
 258 #ifdef CONFIG_SPE
 259 #define SPEFSCR_INIT .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
 260 #else
 261 #define SPEFSCR_INIT
 262 #endif
 263
 264 #ifdef CONFIG_PPC32
 265 #define INIT_THREAD { \
 266         .ksp = INIT_SP, \
 267         .ksp_limit = INIT_SP_LIMIT, \
 268         .fs = KERNEL_DS, \
 269         .pgdir = swapper_pg_dir, \
 270         .fpexc_mode = MSR_FE0 | MSR_FE1, \
 271         SPEFSCR_INIT \
 272 }
 273 #else
 274 #define INIT_THREAD  { \
 275         .ksp = INIT_SP, \
 276         .ksp_limit = INIT_SP_LIMIT, \
 277         .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
 278         .fs = KERNEL_DS, \
 279         .fpr = {{0}}, \
 280         .fpscr = { .val = 0, }, \
 281         .fpexc_mode = 0, \
 282 }
 283 #endif
 284
 285 /*
 286  * Return saved PC of a blocked thread. For now, this is the "user" PC
 287  */
 288 #define thread_saved_pc(tsk)    \
 289         ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 290
 291 #define task_pt_regs(tsk)       ((struct pt_regs *)(tsk)->thread.regs)
 292
 293 unsigned long get_wchan(struct task_struct *p);
 294
 295 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 296 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 297
 298 /* Get/set floating-point exception mode */
 299 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 300 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 301
 302 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 303 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 304
 305 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
 306 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
 307
 308 extern int get_endian(struct task_struct *tsk, unsigned long adr);
 309 extern int set_endian(struct task_struct *tsk, unsigned int val);
 310
 311 #define GET_UNALIGN_CTL(tsk, adr)       get_unalign_ctl((tsk), (adr))
 312 #define SET_UNALIGN_CTL(tsk, val)       set_unalign_ctl((tsk), (val))
 313
 314 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
 315 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
 316
 317 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
 318 {
 319         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 320 }
 321
 322 static inline unsigned long __pack_fe01(unsigned int fpmode)
 323 {
 324         return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 325 }
 326
 327 #ifdef CONFIG_PPC64
 328 #define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
 329 #else
 330 #define cpu_relax()     barrier()
 331 #endif
 332
 333 /* Check that a certain kernel stack pointer is valid in task_struct p */
 334 int validate_sp(unsigned long sp, struct task_struct *p,
 335                        unsigned long nbytes);
 336
 337 /*
 338  * Prefetch macros.
 339  */
 340 #define ARCH_HAS_PREFETCH
 341 #define ARCH_HAS_PREFETCHW
 342 #define ARCH_HAS_SPINLOCK_PREFETCH
 343
 344 static inline void prefetch(const void *x)
 345 {
 346         if (unlikely(!x))
 347                 return;
 348
 349         __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
 350 }
 351
 352 static inline void prefetchw(const void *x)
 353 {
 354         if (unlikely(!x))
 355                 return;
 356
 357         __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
 358 }
 359
 360 #define spin_lock_prefetch(x)   prefetchw(x)
 361
 362 #ifdef CONFIG_PPC64
 363 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 364 #endif
 365
 366 #ifdef CONFIG_PPC64
 367 static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
 368 {
 369         unsigned long sp;
 370
 371         if (is_32)
 372                 sp = regs->gpr[1] & 0x0ffffffffUL;
 373         else
 374                 sp = regs->gpr[1];
 375
 376         return sp;
 377 }
 378 #else
 379 static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
 380 {
 381         return regs->gpr[1];
 382 }
 383 #endif
 384
 385 #endif /* __KERNEL__ */
 386 #endif /* __ASSEMBLY__ */
 387 #endif /* _ASM_POWERPC_PROCESSOR_H */