arch/powerpc/include/asm/ppc_asm.h

   1 /*
   2  * Copyright (C) 1995-1999 Gary Thomas, Paul Mackerras, Cort Dougan.
   3  */
   4 #ifndef _ASM_POWERPC_PPC_ASM_H
   5 #define _ASM_POWERPC_PPC_ASM_H
   6
   7 #include <linux/stringify.h>
   8 #include <asm/asm-compat.h>
   9 #include <asm/processor.h>
  10 #include <asm/ppc-opcode.h>
  11 #include <asm/firmware.h>
  12
  13 #ifdef __ASSEMBLY__
  14
  15 #define SZL                     (BITS_PER_LONG/8)
  16
  17 /*
  18  * Stuff for accurate CPU time accounting.
  19  * These macros handle transitions between user and system state
  20  * in exception entry and exit and accumulate time to the
  21  * user_time and system_time fields in the paca.
  22  */
  23
  24 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  25 #define ACCOUNT_CPU_USER_ENTRY(ptr, ra, rb)
  26 #define ACCOUNT_CPU_USER_EXIT(ptr, ra, rb)
  27 #define ACCOUNT_STOLEN_TIME
  28 #else
  29 #define ACCOUNT_CPU_USER_ENTRY(ptr, ra, rb)                             \
  30         MFTB(ra);                       /* get timebase */              \
  31         PPC_LL  rb, ACCOUNT_STARTTIME_USER(ptr);                        \
  32         PPC_STL ra, ACCOUNT_STARTTIME(ptr);                             \
  33         subf    rb,rb,ra;               /* subtract start value */      \
  34         PPC_LL  ra, ACCOUNT_USER_TIME(ptr);                             \
  35         add     ra,ra,rb;               /* add on to user time */       \
  36         PPC_STL ra, ACCOUNT_USER_TIME(ptr);                             \
  37
  38 #define ACCOUNT_CPU_USER_EXIT(ptr, ra, rb)                              \
  39         MFTB(ra);                       /* get timebase */              \
  40         PPC_LL  rb, ACCOUNT_STARTTIME(ptr);                             \
  41         PPC_STL ra, ACCOUNT_STARTTIME_USER(ptr);                        \
  42         subf    rb,rb,ra;               /* subtract start value */      \
  43         PPC_LL  ra, ACCOUNT_SYSTEM_TIME(ptr);                           \
  44         add     ra,ra,rb;               /* add on to system time */     \
  45         PPC_STL ra, ACCOUNT_SYSTEM_TIME(ptr)
  46
  47 #ifdef CONFIG_PPC_SPLPAR
  48 #define ACCOUNT_STOLEN_TIME                                             \
  49 BEGIN_FW_FTR_SECTION;                                                   \
  50         beq     33f;                                                    \
  51         /* from user - see if there are any DTL entries to process */   \
  52         ld      r10,PACALPPACAPTR(r13); /* get ptr to VPA */            \
  53         ld      r11,PACA_DTL_RIDX(r13); /* get log read index */        \
  54         addi    r10,r10,LPPACA_DTLIDX;                                  \
  55         LDX_BE  r10,0,r10;              /* get log write index */       \
  56         cmpd    cr1,r11,r10;                                            \
  57         beq+    cr1,33f;                                                \
  58         bl      accumulate_stolen_time;                         \
  59         ld      r12,_MSR(r1);                                           \
  60         andi.   r10,r12,MSR_PR;         /* Restore cr0 (coming from user) */ \
  61 33:                                                                     \
  62 END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
  63
  64 #else  /* CONFIG_PPC_SPLPAR */
  65 #define ACCOUNT_STOLEN_TIME
  66
  67 #endif /* CONFIG_PPC_SPLPAR */
  68
  69 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
  70
  71 /*
  72  * Macros for storing registers into and loading registers from
  73  * exception frames.
  74  */
  75 #ifdef __powerpc64__
  76 #define SAVE_GPR(n, base)       std     n,GPR0+8*(n)(base)
  77 #define REST_GPR(n, base)       ld      n,GPR0+8*(n)(base)
  78 #define SAVE_NVGPRS(base)       SAVE_8GPRS(14, base); SAVE_10GPRS(22, base)
  79 #define REST_NVGPRS(base)       REST_8GPRS(14, base); REST_10GPRS(22, base)
  80 #else
  81 #define SAVE_GPR(n, base)       stw     n,GPR0+4*(n)(base)
  82 #define REST_GPR(n, base)       lwz     n,GPR0+4*(n)(base)
  83 #define SAVE_NVGPRS(base)       SAVE_GPR(13, base); SAVE_8GPRS(14, base); \
  84                                 SAVE_10GPRS(22, base)
  85 #define REST_NVGPRS(base)       REST_GPR(13, base); REST_8GPRS(14, base); \
  86                                 REST_10GPRS(22, base)
  87 #endif
  88
  89 #define SAVE_2GPRS(n, base)     SAVE_GPR(n, base); SAVE_GPR(n+1, base)
  90 #define SAVE_4GPRS(n, base)     SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base)
  91 #define SAVE_8GPRS(n, base)     SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base)
  92 #define SAVE_10GPRS(n, base)    SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base)
  93 #define REST_2GPRS(n, base)     REST_GPR(n, base); REST_GPR(n+1, base)
  94 #define REST_4GPRS(n, base)     REST_2GPRS(n, base); REST_2GPRS(n+2, base)
  95 #define REST_8GPRS(n, base)     REST_4GPRS(n, base); REST_4GPRS(n+4, base)
  96 #define REST_10GPRS(n, base)    REST_8GPRS(n, base); REST_2GPRS(n+8, base)
  97
  98 #define SAVE_FPR(n, base)       stfd    n,8*TS_FPRWIDTH*(n)(base)
  99 #define SAVE_2FPRS(n, base)     SAVE_FPR(n, base); SAVE_FPR(n+1, base)
 100 #define SAVE_4FPRS(n, base)     SAVE_2FPRS(n, base); SAVE_2FPRS(n+2, base)
 101 #define SAVE_8FPRS(n, base)     SAVE_4FPRS(n, base); SAVE_4FPRS(n+4, base)
 102 #define SAVE_16FPRS(n, base)    SAVE_8FPRS(n, base); SAVE_8FPRS(n+8, base)
 103 #define SAVE_32FPRS(n, base)    SAVE_16FPRS(n, base); SAVE_16FPRS(n+16, base)
 104 #define REST_FPR(n, base)       lfd     n,8*TS_FPRWIDTH*(n)(base)
 105 #define REST_2FPRS(n, base)     REST_FPR(n, base); REST_FPR(n+1, base)
 106 #define REST_4FPRS(n, base)     REST_2FPRS(n, base); REST_2FPRS(n+2, base)
 107 #define REST_8FPRS(n, base)     REST_4FPRS(n, base); REST_4FPRS(n+4, base)
 108 #define REST_16FPRS(n, base)    REST_8FPRS(n, base); REST_8FPRS(n+8, base)
 109 #define REST_32FPRS(n, base)    REST_16FPRS(n, base); REST_16FPRS(n+16, base)
 110
 111 #define SAVE_VR(n,b,base)       li b,16*(n);  stvx n,base,b
 112 #define SAVE_2VRS(n,b,base)     SAVE_VR(n,b,base); SAVE_VR(n+1,b,base)
 113 #define SAVE_4VRS(n,b,base)     SAVE_2VRS(n,b,base); SAVE_2VRS(n+2,b,base)
 114 #define SAVE_8VRS(n,b,base)     SAVE_4VRS(n,b,base); SAVE_4VRS(n+4,b,base)
 115 #define SAVE_16VRS(n,b,base)    SAVE_8VRS(n,b,base); SAVE_8VRS(n+8,b,base)
 116 #define SAVE_32VRS(n,b,base)    SAVE_16VRS(n,b,base); SAVE_16VRS(n+16,b,base)
 117 #define REST_VR(n,b,base)       li b,16*(n); lvx n,base,b
 118 #define REST_2VRS(n,b,base)     REST_VR(n,b,base); REST_VR(n+1,b,base)
 119 #define REST_4VRS(n,b,base)     REST_2VRS(n,b,base); REST_2VRS(n+2,b,base)
 120 #define REST_8VRS(n,b,base)     REST_4VRS(n,b,base); REST_4VRS(n+4,b,base)
 121 #define REST_16VRS(n,b,base)    REST_8VRS(n,b,base); REST_8VRS(n+8,b,base)
 122 #define REST_32VRS(n,b,base)    REST_16VRS(n,b,base); REST_16VRS(n+16,b,base)
 123
 124 #ifdef __BIG_ENDIAN__
 125 #define STXVD2X_ROT(n,b,base)           STXVD2X(n,b,base)
 126 #define LXVD2X_ROT(n,b,base)            LXVD2X(n,b,base)
 127 #else
 128 #define STXVD2X_ROT(n,b,base)           XXSWAPD(n,n);           \
 129                                         STXVD2X(n,b,base);      \
 130                                         XXSWAPD(n,n)
 131
 132 #define LXVD2X_ROT(n,b,base)            LXVD2X(n,b,base);       \
 133                                         XXSWAPD(n,n)
 134 #endif
 135 /* Save the lower 32 VSRs in the thread VSR region */
 136 #define SAVE_VSR(n,b,base)      li b,16*(n);  STXVD2X_ROT(n,R##base,R##b)
 137 #define SAVE_2VSRS(n,b,base)    SAVE_VSR(n,b,base); SAVE_VSR(n+1,b,base)
 138 #define SAVE_4VSRS(n,b,base)    SAVE_2VSRS(n,b,base); SAVE_2VSRS(n+2,b,base)
 139 #define SAVE_8VSRS(n,b,base)    SAVE_4VSRS(n,b,base); SAVE_4VSRS(n+4,b,base)
 140 #define SAVE_16VSRS(n,b,base)   SAVE_8VSRS(n,b,base); SAVE_8VSRS(n+8,b,base)
 141 #define SAVE_32VSRS(n,b,base)   SAVE_16VSRS(n,b,base); SAVE_16VSRS(n+16,b,base)
 142 #define REST_VSR(n,b,base)      li b,16*(n); LXVD2X_ROT(n,R##base,R##b)
 143 #define REST_2VSRS(n,b,base)    REST_VSR(n,b,base); REST_VSR(n+1,b,base)
 144 #define REST_4VSRS(n,b,base)    REST_2VSRS(n,b,base); REST_2VSRS(n+2,b,base)
 145 #define REST_8VSRS(n,b,base)    REST_4VSRS(n,b,base); REST_4VSRS(n+4,b,base)
 146 #define REST_16VSRS(n,b,base)   REST_8VSRS(n,b,base); REST_8VSRS(n+8,b,base)
 147 #define REST_32VSRS(n,b,base)   REST_16VSRS(n,b,base); REST_16VSRS(n+16,b,base)
 148
 149 /*
 150  * b = base register for addressing, o = base offset from register of 1st EVR
 151  * n = first EVR, s = scratch
 152  */
 153 #define SAVE_EVR(n,s,b,o)       evmergehi s,s,n; stw s,o+4*(n)(b)
 154 #define SAVE_2EVRS(n,s,b,o)     SAVE_EVR(n,s,b,o); SAVE_EVR(n+1,s,b,o)
 155 #define SAVE_4EVRS(n,s,b,o)     SAVE_2EVRS(n,s,b,o); SAVE_2EVRS(n+2,s,b,o)
 156 #define SAVE_8EVRS(n,s,b,o)     SAVE_4EVRS(n,s,b,o); SAVE_4EVRS(n+4,s,b,o)
 157 #define SAVE_16EVRS(n,s,b,o)    SAVE_8EVRS(n,s,b,o); SAVE_8EVRS(n+8,s,b,o)
 158 #define SAVE_32EVRS(n,s,b,o)    SAVE_16EVRS(n,s,b,o); SAVE_16EVRS(n+16,s,b,o)
 159 #define REST_EVR(n,s,b,o)       lwz s,o+4*(n)(b); evmergelo n,s,n
 160 #define REST_2EVRS(n,s,b,o)     REST_EVR(n,s,b,o); REST_EVR(n+1,s,b,o)
 161 #define REST_4EVRS(n,s,b,o)     REST_2EVRS(n,s,b,o); REST_2EVRS(n+2,s,b,o)
 162 #define REST_8EVRS(n,s,b,o)     REST_4EVRS(n,s,b,o); REST_4EVRS(n+4,s,b,o)
 163 #define REST_16EVRS(n,s,b,o)    REST_8EVRS(n,s,b,o); REST_8EVRS(n+8,s,b,o)
 164 #define REST_32EVRS(n,s,b,o)    REST_16EVRS(n,s,b,o); REST_16EVRS(n+16,s,b,o)
 165
 166 /* Macros to adjust thread priority for hardware multithreading */
 167 #define HMT_VERY_LOW    or      31,31,31        # very low priority
 168 #define HMT_LOW         or      1,1,1
 169 #define HMT_MEDIUM_LOW  or      6,6,6           # medium low priority
 170 #define HMT_MEDIUM      or      2,2,2
 171 #define HMT_MEDIUM_HIGH or      5,5,5           # medium high priority
 172 #define HMT_HIGH        or      3,3,3
 173 #define HMT_EXTRA_HIGH  or      7,7,7           # power7 only
 174
 175 #ifdef CONFIG_PPC64
 176 #define ULONG_SIZE      8
 177 #else
 178 #define ULONG_SIZE      4
 179 #endif
 180 #define __VCPU_GPR(n)   (VCPU_GPRS + (n * ULONG_SIZE))
 181 #define VCPU_GPR(n)     __VCPU_GPR(__REG_##n)
 182
 183 #ifdef __KERNEL__
 184 #ifdef CONFIG_PPC64
 185
 186 #define STACKFRAMESIZE 256
 187 #define __STK_REG(i)   (112 + ((i)-14)*8)
 188 #define STK_REG(i)     __STK_REG(__REG_##i)
 189
 190 #ifdef PPC64_ELF_ABI_v2
 191 #define STK_GOT         24
 192 #define __STK_PARAM(i)  (32 + ((i)-3)*8)
 193 #else
 194 #define STK_GOT         40
 195 #define __STK_PARAM(i)  (48 + ((i)-3)*8)
 196 #endif
 197 #define STK_PARAM(i)    __STK_PARAM(__REG_##i)
 198
 199 #ifdef PPC64_ELF_ABI_v2
 200
 201 #define _GLOBAL(name) \
 202         .align 2 ; \
 203         .type name,@function; \
 204         .globl name; \
 205 name:
 206
 207 #define _GLOBAL_TOC(name) \
 208         .align 2 ; \
 209         .type name,@function; \
 210         .globl name; \
 211 name: \
 212 0:      addis r2,r12,(.TOC.-0b)@ha; \
 213         addi r2,r2,(.TOC.-0b)@l; \
 214         .localentry name,.-name
 215
 216 #define DOTSYM(a)       a
 217
 218 #else
 219
 220 #define XGLUE(a,b) a##b
 221 #define GLUE(a,b) XGLUE(a,b)
 222
 223 #define _GLOBAL(name) \
 224         .align 2 ; \
 225         .globl name; \
 226         .globl GLUE(.,name); \
 227         .pushsection ".opd","aw"; \
 228 name: \
 229         .quad GLUE(.,name); \
 230         .quad .TOC.@tocbase; \
 231         .quad 0; \
 232         .popsection; \
 233         .type GLUE(.,name),@function; \
 234 GLUE(.,name):
 235
 236 #define _GLOBAL_TOC(name) _GLOBAL(name)
 237
 238 #define DOTSYM(a)       GLUE(.,a)
 239
 240 #endif
 241
 242 #else /* 32-bit */
 243
 244 #define _ENTRY(n)       \
 245         .globl n;       \
 246 n:
 247
 248 #define _GLOBAL(n)      \
 249         .stabs __stringify(n:F-1),N_FUN,0,0,n;\
 250         .globl n;       \
 251 n:
 252
 253 #define _GLOBAL_TOC(name) _GLOBAL(name)
 254
 255 #endif
 256
 257 /*
 258  * __kprobes (the C annotation) puts the symbol into the .kprobes.text
 259  * section, which gets emitted at the end of regular text.
 260  *
 261  * _ASM_NOKPROBE_SYMBOL and NOKPROBE_SYMBOL just adds the symbol to
 262  * a blacklist. The former is for core kprobe functions/data, the
 263  * latter is for those that incdentially must be excluded from probing
 264  * and allows them to be linked at more optimal location within text.
 265  */
 266 #ifdef CONFIG_KPROBES
 267 #define _ASM_NOKPROBE_SYMBOL(entry)                     \
 268         .pushsection "_kprobe_blacklist","aw";          \
 269         PPC_LONG (entry) ;                              \
 270         .popsection
 271 #else
 272 #define _ASM_NOKPROBE_SYMBOL(entry)
 273 #endif
 274
 275 #define FUNC_START(name)        _GLOBAL(name)
 276 #define FUNC_END(name)
 277
 278 /*
 279  * LOAD_REG_IMMEDIATE(rn, expr)
 280  *   Loads the value of the constant expression 'expr' into register 'rn'
 281  *   using immediate instructions only.  Use this when it's important not
 282  *   to reference other data (i.e. on ppc64 when the TOC pointer is not
 283  *   valid) and when 'expr' is a constant or absolute address.
 284  *
 285  * LOAD_REG_ADDR(rn, name)
 286  *   Loads the address of label 'name' into register 'rn'.  Use this when
 287  *   you don't particularly need immediate instructions only, but you need
 288  *   the whole address in one register (e.g. it's a structure address and
 289  *   you want to access various offsets within it).  On ppc32 this is
 290  *   identical to LOAD_REG_IMMEDIATE.
 291  *
 292  * LOAD_REG_ADDR_PIC(rn, name)
 293  *   Loads the address of label 'name' into register 'run'. Use this when
 294  *   the kernel doesn't run at the linked or relocated address. Please
 295  *   note that this macro will clobber the lr register.
 296  *
 297  * LOAD_REG_ADDRBASE(rn, name)
 298  * ADDROFF(name)
 299  *   LOAD_REG_ADDRBASE loads part of the address of label 'name' into
 300  *   register 'rn'.  ADDROFF(name) returns the remainder of the address as
 301  *   a constant expression.  ADDROFF(name) is a signed expression < 16 bits
 302  *   in size, so is suitable for use directly as an offset in load and store
 303  *   instructions.  Use this when loading/storing a single word or less as:
 304  *      LOAD_REG_ADDRBASE(rX, name)
 305  *      ld      rY,ADDROFF(name)(rX)
 306  */
 307
 308 /* Be careful, this will clobber the lr register. */
 309 #define LOAD_REG_ADDR_PIC(reg, name)            \
 310         bl      0f;                             \
 311 0:      mflr    reg;                            \
 312         addis   reg,reg,(name - 0b)@ha;         \
 313         addi    reg,reg,(name - 0b)@l;
 314
 315 #ifdef __powerpc64__
 316 #ifdef HAVE_AS_ATHIGH
 317 #define __AS_ATHIGH high
 318 #else
 319 #define __AS_ATHIGH h
 320 #endif
 321 #define LOAD_REG_IMMEDIATE(reg,expr)            \
 322         lis     reg,(expr)@highest;             \
 323         ori     reg,reg,(expr)@higher;  \
 324         rldicr  reg,reg,32,31;          \
 325         oris    reg,reg,(expr)@__AS_ATHIGH;     \
 326         ori     reg,reg,(expr)@l;
 327
 328 #define LOAD_REG_ADDR(reg,name)                 \
 329         ld      reg,name@got(r2)
 330
 331 #define LOAD_REG_ADDRBASE(reg,name)     LOAD_REG_ADDR(reg,name)
 332 #define ADDROFF(name)                   0
 333
 334 /* offsets for stack frame layout */
 335 #define LRSAVE  16
 336
 337 #else /* 32-bit */
 338
 339 #define LOAD_REG_IMMEDIATE(reg,expr)            \
 340         lis     reg,(expr)@ha;          \
 341         addi    reg,reg,(expr)@l;
 342
 343 #define LOAD_REG_ADDR(reg,name)         LOAD_REG_IMMEDIATE(reg, name)
 344
 345 #define LOAD_REG_ADDRBASE(reg, name)    lis     reg,name@ha
 346 #define ADDROFF(name)                   name@l
 347
 348 /* offsets for stack frame layout */
 349 #define LRSAVE  4
 350
 351 #endif
 352
 353 /* various errata or part fixups */
 354 #ifdef CONFIG_PPC601_SYNC_FIX
 355 #define SYNC                            \
 356 BEGIN_FTR_SECTION                       \
 357         sync;                           \
 358         isync;                          \
 359 END_FTR_SECTION_IFSET(CPU_FTR_601)
 360 #define SYNC_601                        \
 361 BEGIN_FTR_SECTION                       \
 362         sync;                           \
 363 END_FTR_SECTION_IFSET(CPU_FTR_601)
 364 #define ISYNC_601                       \
 365 BEGIN_FTR_SECTION                       \
 366         isync;                          \
 367 END_FTR_SECTION_IFSET(CPU_FTR_601)
 368 #else
 369 #define SYNC
 370 #define SYNC_601
 371 #define ISYNC_601
 372 #endif
 373
 374 #if defined(CONFIG_PPC_CELL) || defined(CONFIG_PPC_FSL_BOOK3E)
 375 #define MFTB(dest)                      \
 376 90:     mfspr dest, SPRN_TBRL;          \
 377 BEGIN_FTR_SECTION_NESTED(96);           \
 378         cmpwi dest,0;                   \
 379         beq-  90b;                      \
 380 END_FTR_SECTION_NESTED(CPU_FTR_CELL_TB_BUG, CPU_FTR_CELL_TB_BUG, 96)
 381 #else
 382 #define MFTB(dest)                      MFTBL(dest)
 383 #endif
 384
 385 #ifdef CONFIG_PPC_8xx
 386 #define MFTBL(dest)                     mftb dest
 387 #define MFTBU(dest)                     mftbu dest
 388 #else
 389 #define MFTBL(dest)                     mfspr dest, SPRN_TBRL
 390 #define MFTBU(dest)                     mfspr dest, SPRN_TBRU
 391 #endif
 392
 393 #ifndef CONFIG_SMP
 394 #define TLBSYNC
 395 #else /* CONFIG_SMP */
 396 /* tlbsync is not implemented on 601 */
 397 #define TLBSYNC                         \
 398 BEGIN_FTR_SECTION                       \
 399         tlbsync;                        \
 400         sync;                           \
 401 END_FTR_SECTION_IFCLR(CPU_FTR_601)
 402 #endif
 403
 404 #ifdef CONFIG_PPC64
 405 #define MTOCRF(FXM, RS)                 \
 406         BEGIN_FTR_SECTION_NESTED(848);  \
 407         mtcrf   (FXM), RS;              \
 408         FTR_SECTION_ELSE_NESTED(848);   \
 409         mtocrf (FXM), RS;               \
 410         ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_NOEXECUTE, 848)
 411 #endif
 412
 413 /*
 414  * This instruction is not implemented on the PPC 603 or 601; however, on
 415  * the 403GCX and 405GP tlbia IS defined and tlbie is not.
 416  * All of these instructions exist in the 8xx, they have magical powers,
 417  * and they must be used.
 418  */
 419
 420 #if !defined(CONFIG_4xx) && !defined(CONFIG_PPC_8xx)
 421 #define tlbia                                   \
 422         li      r4,1024;                        \
 423         mtctr   r4;                             \
 424         lis     r4,KERNELBASE@h;                \
 425         .machine push;                          \
 426         .machine "power4";                      \
 427 0:      tlbie   r4;                             \
 428         .machine pop;                           \
 429         addi    r4,r4,0x1000;                   \
 430         bdnz    0b
 431 #endif
 432
 433
 434 #ifdef CONFIG_IBM440EP_ERR42
 435 #define PPC440EP_ERR42 isync
 436 #else
 437 #define PPC440EP_ERR42
 438 #endif
 439
 440 /* The following stops all load and store data streams associated with stream
 441  * ID (ie. streams created explicitly).  The embedded and server mnemonics for
 442  * dcbt are different so we use machine "power4" here explicitly.
 443  */
 444 #define DCBT_STOP_ALL_STREAM_IDS(scratch)       \
 445 .machine push ;                                 \
 446 .machine "power4" ;                             \
 447        lis     scratch,0x60000000@h;            \
 448        dcbt    0,scratch,0b01010;               \
 449 .machine pop
 450
 451 /*
 452  * toreal/fromreal/tophys/tovirt macros. 32-bit BookE makes them
 453  * keep the address intact to be compatible with code shared with
 454  * 32-bit classic.
 455  *
 456  * On the other hand, I find it useful to have them behave as expected
 457  * by their name (ie always do the addition) on 64-bit BookE
 458  */
 459 #if defined(CONFIG_BOOKE) && !defined(CONFIG_PPC64)
 460 #define toreal(rd)
 461 #define fromreal(rd)
 462
 463 /*
 464  * We use addis to ensure compatibility with the "classic" ppc versions of
 465  * these macros, which use rs = 0 to get the tophys offset in rd, rather than
 466  * converting the address in r0, and so this version has to do that too
 467  * (i.e. set register rd to 0 when rs == 0).
 468  */
 469 #define tophys(rd,rs)                           \
 470         addis   rd,rs,0
 471
 472 #define tovirt(rd,rs)                           \
 473         addis   rd,rs,0
 474
 475 #elif defined(CONFIG_PPC64)
 476 #define toreal(rd)              /* we can access c000... in real mode */
 477 #define fromreal(rd)
 478
 479 #define tophys(rd,rs)                           \
 480         clrldi  rd,rs,2
 481
 482 #define tovirt(rd,rs)                           \
 483         rotldi  rd,rs,16;                       \
 484         ori     rd,rd,((KERNELBASE>>48)&0xFFFF);\
 485         rotldi  rd,rd,48
 486 #else
 487 /*
 488  * On APUS (Amiga PowerPC cpu upgrade board), we don't know the
 489  * physical base address of RAM at compile time.
 490  */
 491 #define toreal(rd)      tophys(rd,rd)
 492 #define fromreal(rd)    tovirt(rd,rd)
 493
 494 #define tophys(rd,rs)                           \
 495 0:      addis   rd,rs,-PAGE_OFFSET@h;           \
 496         .section ".vtop_fixup","aw";            \
 497         .align  1;                              \
 498         .long   0b;                             \
 499         .previous
 500
 501 #define tovirt(rd,rs)                           \
 502 0:      addis   rd,rs,PAGE_OFFSET@h;            \
 503         .section ".ptov_fixup","aw";            \
 504         .align  1;                              \
 505         .long   0b;                             \
 506         .previous
 507 #endif
 508
 509 #ifdef CONFIG_PPC_BOOK3S_64
 510 #define RFI             rfid
 511 #define MTMSRD(r)       mtmsrd  r
 512 #define MTMSR_EERI(reg) mtmsrd  reg,1
 513 #else
 514 #ifndef CONFIG_40x
 515 #define RFI             rfi
 516 #else
 517 #define RFI             rfi; b .        /* Prevent prefetch past rfi */
 518 #endif
 519 #define MTMSRD(r)       mtmsr   r
 520 #define MTMSR_EERI(reg) mtmsr   reg
 521 #endif
 522
 523 #endif /* __KERNEL__ */
 524
 525 /* The boring bits... */
 526
 527 /* Condition Register Bit Fields */
 528
 529 #define cr0     0
 530 #define cr1     1
 531 #define cr2     2
 532 #define cr3     3
 533 #define cr4     4
 534 #define cr5     5
 535 #define cr6     6
 536 #define cr7     7
 537
 538
 539 /*
 540  * General Purpose Registers (GPRs)
 541  *
 542  * The lower case r0-r31 should be used in preference to the upper
 543  * case R0-R31 as they provide more error checking in the assembler.
 544  * Use R0-31 only when really nessesary.
 545  */
 546
 547 #define r0      %r0
 548 #define r1      %r1
 549 #define r2      %r2
 550 #define r3      %r3
 551 #define r4      %r4
 552 #define r5      %r5
 553 #define r6      %r6
 554 #define r7      %r7
 555 #define r8      %r8
 556 #define r9      %r9
 557 #define r10     %r10
 558 #define r11     %r11
 559 #define r12     %r12
 560 #define r13     %r13
 561 #define r14     %r14
 562 #define r15     %r15
 563 #define r16     %r16
 564 #define r17     %r17
 565 #define r18     %r18
 566 #define r19     %r19
 567 #define r20     %r20
 568 #define r21     %r21
 569 #define r22     %r22
 570 #define r23     %r23
 571 #define r24     %r24
 572 #define r25     %r25
 573 #define r26     %r26
 574 #define r27     %r27
 575 #define r28     %r28
 576 #define r29     %r29
 577 #define r30     %r30
 578 #define r31     %r31
 579
 580
 581 /* Floating Point Registers (FPRs) */
 582
 583 #define fr0     0
 584 #define fr1     1
 585 #define fr2     2
 586 #define fr3     3
 587 #define fr4     4
 588 #define fr5     5
 589 #define fr6     6
 590 #define fr7     7
 591 #define fr8     8
 592 #define fr9     9
 593 #define fr10    10
 594 #define fr11    11
 595 #define fr12    12
 596 #define fr13    13
 597 #define fr14    14
 598 #define fr15    15
 599 #define fr16    16
 600 #define fr17    17
 601 #define fr18    18
 602 #define fr19    19
 603 #define fr20    20
 604 #define fr21    21
 605 #define fr22    22
 606 #define fr23    23
 607 #define fr24    24
 608 #define fr25    25
 609 #define fr26    26
 610 #define fr27    27
 611 #define fr28    28
 612 #define fr29    29
 613 #define fr30    30
 614 #define fr31    31
 615
 616 /* AltiVec Registers (VPRs) */
 617
 618 #define v0      0
 619 #define v1      1
 620 #define v2      2
 621 #define v3      3
 622 #define v4      4
 623 #define v5      5
 624 #define v6      6
 625 #define v7      7
 626 #define v8      8
 627 #define v9      9
 628 #define v10     10
 629 #define v11     11
 630 #define v12     12
 631 #define v13     13
 632 #define v14     14
 633 #define v15     15
 634 #define v16     16
 635 #define v17     17
 636 #define v18     18
 637 #define v19     19
 638 #define v20     20
 639 #define v21     21
 640 #define v22     22
 641 #define v23     23
 642 #define v24     24
 643 #define v25     25
 644 #define v26     26
 645 #define v27     27
 646 #define v28     28
 647 #define v29     29
 648 #define v30     30
 649 #define v31     31
 650
 651 /* VSX Registers (VSRs) */
 652
 653 #define vs0     0
 654 #define vs1     1
 655 #define vs2     2
 656 #define vs3     3
 657 #define vs4     4
 658 #define vs5     5
 659 #define vs6     6
 660 #define vs7     7
 661 #define vs8     8
 662 #define vs9     9
 663 #define vs10    10
 664 #define vs11    11
 665 #define vs12    12
 666 #define vs13    13
 667 #define vs14    14
 668 #define vs15    15
 669 #define vs16    16
 670 #define vs17    17
 671 #define vs18    18
 672 #define vs19    19
 673 #define vs20    20
 674 #define vs21    21
 675 #define vs22    22
 676 #define vs23    23
 677 #define vs24    24
 678 #define vs25    25
 679 #define vs26    26
 680 #define vs27    27
 681 #define vs28    28
 682 #define vs29    29
 683 #define vs30    30
 684 #define vs31    31
 685 #define vs32    32
 686 #define vs33    33
 687 #define vs34    34
 688 #define vs35    35
 689 #define vs36    36
 690 #define vs37    37
 691 #define vs38    38
 692 #define vs39    39
 693 #define vs40    40
 694 #define vs41    41
 695 #define vs42    42
 696 #define vs43    43
 697 #define vs44    44
 698 #define vs45    45
 699 #define vs46    46
 700 #define vs47    47
 701 #define vs48    48
 702 #define vs49    49
 703 #define vs50    50
 704 #define vs51    51
 705 #define vs52    52
 706 #define vs53    53
 707 #define vs54    54
 708 #define vs55    55
 709 #define vs56    56
 710 #define vs57    57
 711 #define vs58    58
 712 #define vs59    59
 713 #define vs60    60
 714 #define vs61    61
 715 #define vs62    62
 716 #define vs63    63
 717
 718 /* SPE Registers (EVPRs) */
 719
 720 #define evr0    0
 721 #define evr1    1
 722 #define evr2    2
 723 #define evr3    3
 724 #define evr4    4
 725 #define evr5    5
 726 #define evr6    6
 727 #define evr7    7
 728 #define evr8    8
 729 #define evr9    9
 730 #define evr10   10
 731 #define evr11   11
 732 #define evr12   12
 733 #define evr13   13
 734 #define evr14   14
 735 #define evr15   15
 736 #define evr16   16
 737 #define evr17   17
 738 #define evr18   18
 739 #define evr19   19
 740 #define evr20   20
 741 #define evr21   21
 742 #define evr22   22
 743 #define evr23   23
 744 #define evr24   24
 745 #define evr25   25
 746 #define evr26   26
 747 #define evr27   27
 748 #define evr28   28
 749 #define evr29   29
 750 #define evr30   30
 751 #define evr31   31
 752
 753 /* some stab codes */
 754 #define N_FUN   36
 755 #define N_RSYM  64
 756 #define N_SLINE 68
 757 #define N_SO    100
 758
 759 /*
 760  * Create an endian fixup trampoline
 761  *
 762  * This starts with a "tdi 0,0,0x48" instruction which is
 763  * essentially a "trap never", and thus akin to a nop.
 764  *
 765  * The opcode for this instruction read with the wrong endian
 766  * however results in a b . + 8
 767  *
 768  * So essentially we use that trick to execute the following
 769  * trampoline in "reverse endian" if we are running with the
 770  * MSR_LE bit set the "wrong" way for whatever endianness the
 771  * kernel is built for.
 772  */
 773
 774 #ifdef CONFIG_PPC_BOOK3E
 775 #define FIXUP_ENDIAN
 776 #else
 777 /*
 778  * This version may be used in in HV or non-HV context.
 779  * MSR[EE] must be disabled.
 780  */
 781 #define FIXUP_ENDIAN                                               \
 782         tdi   0,0,0x48;   /* Reverse endian of b . + 8          */ \
 783         b     191f;       /* Skip trampoline if endian is good  */ \
 784         .long 0xa600607d; /* mfmsr r11                          */ \
 785         .long 0x01006b69; /* xori r11,r11,1                     */ \
 786         .long 0x00004039; /* li r10,0                           */ \
 787         .long 0x6401417d; /* mtmsrd r10,1                       */ \
 788         .long 0x05009f42; /* bcl 20,31,$+4                      */ \
 789         .long 0xa602487d; /* mflr r10                           */ \
 790         .long 0x14004a39; /* addi r10,r10,20                    */ \
 791         .long 0xa6035a7d; /* mtsrr0 r10                         */ \
 792         .long 0xa6037b7d; /* mtsrr1 r11                         */ \
 793         .long 0x2400004c; /* rfid                               */ \
 794 191:
 795
 796 /*
 797  * This version that may only be used with MSR[HV]=1
 798  * - Does not clear MSR[RI], so more robust.
 799  * - Slightly smaller and faster.
 800  */
 801 #define FIXUP_ENDIAN_HV                                            \
 802         tdi   0,0,0x48;   /* Reverse endian of b . + 8          */ \
 803         b     191f;       /* Skip trampoline if endian is good  */ \
 804         .long 0xa600607d; /* mfmsr r11                          */ \
 805         .long 0x01006b69; /* xori r11,r11,1                     */ \
 806         .long 0x05009f42; /* bcl 20,31,$+4                      */ \
 807         .long 0xa602487d; /* mflr r10                           */ \
 808         .long 0x14004a39; /* addi r10,r10,20                    */ \
 809         .long 0xa64b5a7d; /* mthsrr0 r10                        */ \
 810         .long 0xa64b7b7d; /* mthsrr1 r11                        */ \
 811         .long 0x2402004c; /* hrfid                              */ \
 812 191:
 813
 814 #endif /* !CONFIG_PPC_BOOK3E */
 815
 816 #endif /*  __ASSEMBLY__ */
 817
 818 /*
 819  * Helper macro for exception table entries
 820  */
 821 #define EX_TABLE(_fault, _target)               \
 822         stringify_in_c(.section __ex_table,"a";)\
 823         stringify_in_c(.balign 4;)              \
 824         stringify_in_c(.long (_fault) - . ;)    \
 825         stringify_in_c(.long (_target) - . ;)   \
 826         stringify_in_c(.previous)
 827
 828 #endif /* _ASM_POWERPC_PPC_ASM_H */