arch/powerpc/include/asm/exception-64s.h

   1 #ifndef _ASM_POWERPC_EXCEPTION_H
   2 #define _ASM_POWERPC_EXCEPTION_H
   3 /*
   4  * Extracted from head_64.S
   5  *
   6  *  PowerPC version
   7  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   8  *
   9  *  Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
  10  *    Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
  11  *  Adapted for Power Macintosh by Paul Mackerras.
  12  *  Low-level exception handlers and MMU support
  13  *  rewritten by Paul Mackerras.
  14  *    Copyright (C) 1996 Paul Mackerras.
  15  *
  16  *  Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
  17  *    Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
  18  *
  19  *  This file contains the low-level support and setup for the
  20  *  PowerPC-64 platform, including trap and interrupt dispatch.
  21  *
  22  *  This program is free software; you can redistribute it and/or
  23  *  modify it under the terms of the GNU General Public License
  24  *  as published by the Free Software Foundation; either version
  25  *  2 of the License, or (at your option) any later version.
  26  */
  27 /*
  28  * The following macros define the code that appears as
  29  * the prologue to each of the exception handlers.  They
  30  * are split into two parts to allow a single kernel binary
  31  * to be used for pSeries and iSeries.
  32  *
  33  * We make as much of the exception code common between native
  34  * exception handlers (including pSeries LPAR) and iSeries LPAR
  35  * implementations as possible.
  36  */
  37 #include <asm/head-64.h>
  38
  39 #define EX_R9           0
  40 #define EX_R10          8
  41 #define EX_R11          16
  42 #define EX_R12          24
  43 #define EX_R13          32
  44 #define EX_SRR0         40
  45 #define EX_DAR          48
  46 #define EX_DSISR        56
  47 #define EX_CCR          60
  48 #define EX_R3           64
  49 #define EX_LR           72
  50 #define EX_CFAR         80
  51 #define EX_PPR          88      /* SMT thread status register (priority) */
  52 #define EX_CTR          96
  53
  54 #ifdef CONFIG_RELOCATABLE
  55 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
  56         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
  57         LOAD_HANDLER(r12,label);                                        \
  58         mtctr   r12;                                                    \
  59         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
  60         li      r10,MSR_RI;                                             \
  61         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
  62         bctr;
  63 #else
  64 /* If not relocatable, we can jump directly -- and save messing with LR */
  65 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
  66         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
  67         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
  68         li      r10,MSR_RI;                                             \
  69         mtmsrd  r10,1;                  /* Set RI (EE=0) */             \
  70         b       label;
  71 #endif
  72 #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                      \
  73         __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)                    \
  74
  75 /*
  76  * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on
  77  * so no need to rfid.  Save lr in case we're CONFIG_RELOCATABLE, in which
  78  * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr.
  79  */
  80 #define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec)      \
  81         EXCEPTION_PROLOG_0(area);                                       \
  82         EXCEPTION_PROLOG_1(area, extra, vec);                           \
  83         EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
  84
  85 /*
  86  * We're short on space and time in the exception prolog, so we can't
  87  * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
  88  * Instead we get the base of the kernel from paca->kernelbase and or in the low
  89  * part of label. This requires that the label be within 64KB of kernelbase, and
  90  * that kernelbase be 64K aligned.
  91  */
  92 #define LOAD_HANDLER(reg, label)                                        \
  93         ld      reg,PACAKBASE(r13);     /* get high part of &label */   \
  94         ori     reg,reg,FIXED_SYMBOL_ABS_ADDR(label);
  95
  96 #define __LOAD_HANDLER(reg, label)                                      \
  97         ld      reg,PACAKBASE(r13);                                     \
  98         ori     reg,reg,(ABS_ADDR(label))@l;
  99
 100 /*
 101  * Branches from unrelocated code (e.g., interrupts) to labels outside
 102  * head-y require >64K offsets.
 103  */
 104 #define __LOAD_FAR_HANDLER(reg, label)                                  \
 105         ld      reg,PACAKBASE(r13);                                     \
 106         ori     reg,reg,(ABS_ADDR(label))@l;                            \
 107         addis   reg,reg,(ABS_ADDR(label))@h;
 108
 109 /* Exception register prefixes */
 110 #define EXC_HV  H
 111 #define EXC_STD
 112
 113 #if defined(CONFIG_RELOCATABLE)
 114 /*
 115  * If we support interrupts with relocation on AND we're a relocatable kernel,
 116  * we need to use CTR to get to the 2nd level handler.  So, save/restore it
 117  * when required.
 118  */
 119 #define SAVE_CTR(reg, area)     mfctr   reg ;   std     reg,area+EX_CTR(r13)
 120 #define GET_CTR(reg, area)                      ld      reg,area+EX_CTR(r13)
 121 #define RESTORE_CTR(reg, area)  ld      reg,area+EX_CTR(r13) ; mtctr reg
 122 #else
 123 /* ...else CTR is unused and in register. */
 124 #define SAVE_CTR(reg, area)
 125 #define GET_CTR(reg, area)      mfctr   reg
 126 #define RESTORE_CTR(reg, area)
 127 #endif
 128
 129 /*
 130  * PPR save/restore macros used in exceptions_64s.S
 131  * Used for P7 or later processors
 132  */
 133 #define SAVE_PPR(area, ra, rb)                                          \
 134 BEGIN_FTR_SECTION_NESTED(940)                                           \
 135         ld      ra,PACACURRENT(r13);                                    \
 136         ld      rb,area+EX_PPR(r13);    /* Read PPR from paca */        \
 137         std     rb,TASKTHREADPPR(ra);                                   \
 138 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
 139
 140 #define RESTORE_PPR_PACA(area, ra)                                      \
 141 BEGIN_FTR_SECTION_NESTED(941)                                           \
 142         ld      ra,area+EX_PPR(r13);                                    \
 143         mtspr   SPRN_PPR,ra;                                            \
 144 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
 145
 146 /*
 147  * Get an SPR into a register if the CPU has the given feature
 148  */
 149 #define OPT_GET_SPR(ra, spr, ftr)                                       \
 150 BEGIN_FTR_SECTION_NESTED(943)                                           \
 151         mfspr   ra,spr;                                                 \
 152 END_FTR_SECTION_NESTED(ftr,ftr,943)
 153
 154 /*
 155  * Set an SPR from a register if the CPU has the given feature
 156  */
 157 #define OPT_SET_SPR(ra, spr, ftr)                                       \
 158 BEGIN_FTR_SECTION_NESTED(943)                                           \
 159         mtspr   spr,ra;                                                 \
 160 END_FTR_SECTION_NESTED(ftr,ftr,943)
 161
 162 /*
 163  * Save a register to the PACA if the CPU has the given feature
 164  */
 165 #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr)                           \
 166 BEGIN_FTR_SECTION_NESTED(943)                                           \
 167         std     ra,offset(r13);                                         \
 168 END_FTR_SECTION_NESTED(ftr,ftr,943)
 169
 170 #define EXCEPTION_PROLOG_0_PACA(area)                                   \
 171         std     r9,area+EX_R9(r13);     /* save r9 */                   \
 172         OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);                     \
 173         HMT_MEDIUM;                                                     \
 174         std     r10,area+EX_R10(r13);   /* save r10 - r12 */            \
 175         OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
 176
 177 #define EXCEPTION_PROLOG_0(area)                                        \
 178         GET_PACA(r13);                                                  \
 179         EXCEPTION_PROLOG_0_PACA(area)
 180
 181 #define __EXCEPTION_PROLOG_1(area, extra, vec)                          \
 182         OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR);         \
 183         OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR);          \
 184         SAVE_CTR(r10, area);                                            \
 185         mfcr    r9;                                                     \
 186         extra(vec);                                                     \
 187         std     r11,area+EX_R11(r13);                                   \
 188         std     r12,area+EX_R12(r13);                                   \
 189         GET_SCRATCH0(r10);                                              \
 190         std     r10,area+EX_R13(r13)
 191 #define EXCEPTION_PROLOG_1(area, extra, vec)                            \
 192         __EXCEPTION_PROLOG_1(area, extra, vec)
 193
 194 #define __EXCEPTION_PROLOG_PSERIES_1(label, h)                          \
 195         ld      r10,PACAKMSR(r13);      /* get MSR value for kernel */  \
 196         mfspr   r11,SPRN_##h##SRR0;     /* save SRR0 */                 \
 197         LOAD_HANDLER(r12,label)                                         \
 198         mtspr   SPRN_##h##SRR0,r12;                                     \
 199         mfspr   r12,SPRN_##h##SRR1;     /* and SRR1 */                  \
 200         mtspr   SPRN_##h##SRR1,r10;                                     \
 201         h##rfid;                                                        \
 202         b       .       /* prevent speculative execution */
 203 #define EXCEPTION_PROLOG_PSERIES_1(label, h)                            \
 204         __EXCEPTION_PROLOG_PSERIES_1(label, h)
 205
 206 #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec)            \
 207         EXCEPTION_PROLOG_0(area);                                       \
 208         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 209         EXCEPTION_PROLOG_PSERIES_1(label, h);
 210
 211 /* Have the PACA in r13 already */
 212 #define EXCEPTION_PROLOG_PSERIES_PACA(area, label, h, extra, vec)       \
 213         EXCEPTION_PROLOG_0_PACA(area);                                  \
 214         EXCEPTION_PROLOG_1(area, extra, vec);                           \
 215         EXCEPTION_PROLOG_PSERIES_1(label, h);
 216
 217 #define __KVMTEST(h, n)                                                 \
 218         lbz     r10,HSTATE_IN_GUEST(r13);                               \
 219         cmpwi   r10,0;                                                  \
 220         bne     do_kvm_##h##n
 221
 222 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 223 /*
 224  * If hv is possible, interrupts come into to the hv version
 225  * of the kvmppc_interrupt code, which then jumps to the PR handler,
 226  * kvmppc_interrupt_pr, if the guest is a PR guest.
 227  */
 228 #define kvmppc_interrupt kvmppc_interrupt_hv
 229 #else
 230 #define kvmppc_interrupt kvmppc_interrupt_pr
 231 #endif
 232
 233 #ifdef CONFIG_RELOCATABLE
 234 #define BRANCH_TO_COMMON(reg, label)                                    \
 235         __LOAD_HANDLER(reg, label);                                     \
 236         mtctr   reg;                                                    \
 237         bctr
 238
 239 #define BRANCH_LINK_TO_FAR(label)                                       \
 240         __LOAD_FAR_HANDLER(r12, label);                                 \
 241         mtctr   r12;                                                    \
 242         bctrl
 243
 244 /*
 245  * KVM requires __LOAD_FAR_HANDLER.
 246  *
 247  * __BRANCH_TO_KVM_EXIT branches are also a special case because they
 248  * explicitly use r9 then reload it from PACA before branching. Hence
 249  * the double-underscore.
 250  */
 251 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 252         mfctr   r9;                                                     \
 253         std     r9,HSTATE_SCRATCH1(r13);                                \
 254         __LOAD_FAR_HANDLER(r9, label);                                  \
 255         mtctr   r9;                                                     \
 256         ld      r9,area+EX_R9(r13);                                     \
 257         bctr
 258
 259 #define BRANCH_TO_KVM(reg, label)                                       \
 260         __LOAD_FAR_HANDLER(reg, label);                                 \
 261         mtctr   reg;                                                    \
 262         bctr
 263
 264 #else
 265 #define BRANCH_TO_COMMON(reg, label)                                    \
 266         b       label
 267
 268 #define BRANCH_LINK_TO_FAR(label)                                       \
 269         bl      label
 270
 271 #define BRANCH_TO_KVM(reg, label)                                       \
 272         b       label
 273
 274 #define __BRANCH_TO_KVM_EXIT(area, label)                               \
 275         ld      r9,area+EX_R9(r13);                                     \
 276         b       label
 277
 278 #endif
 279
 280
 281 #define __KVM_HANDLER(area, h, n)                                       \
 282         BEGIN_FTR_SECTION_NESTED(947)                                   \
 283         ld      r10,area+EX_CFAR(r13);                                  \
 284         std     r10,HSTATE_CFAR(r13);                                   \
 285         END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);          \
 286         BEGIN_FTR_SECTION_NESTED(948)                                   \
 287         ld      r10,area+EX_PPR(r13);                                   \
 288         std     r10,HSTATE_PPR(r13);                                    \
 289         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 290         ld      r10,area+EX_R10(r13);                                   \
 291         std     r12,HSTATE_SCRATCH0(r13);                               \
 292         sldi    r12,r9,32;                                              \
 293         ori     r12,r12,(n);                                            \
 294         /* This reloads r9 before branching to kvmppc_interrupt */      \
 295         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt)
 296
 297 #define __KVM_HANDLER_SKIP(area, h, n)                                  \
 298         cmpwi   r10,KVM_GUEST_MODE_SKIP;                                \
 299         beq     89f;                                                    \
 300         BEGIN_FTR_SECTION_NESTED(948)                                   \
 301         ld      r10,area+EX_PPR(r13);                                   \
 302         std     r10,HSTATE_PPR(r13);                                    \
 303         END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);    \
 304         ld      r10,area+EX_R10(r13);                                   \
 305         std     r12,HSTATE_SCRATCH0(r13);                               \
 306         sldi    r12,r9,32;                                              \
 307         ori     r12,r12,(n);                                            \
 308         /* This reloads r9 before branching to kvmppc_interrupt */      \
 309         __BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt);                   \
 310 89:     mtocrf  0x80,r9;                                                \
 311         ld      r9,area+EX_R9(r13);                                     \
 312         ld      r10,area+EX_R10(r13);                                   \
 313         b       kvmppc_skip_##h##interrupt
 314
 315 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 316 #define KVMTEST(h, n)                   __KVMTEST(h, n)
 317 #define KVM_HANDLER(area, h, n)         __KVM_HANDLER(area, h, n)
 318 #define KVM_HANDLER_SKIP(area, h, n)    __KVM_HANDLER_SKIP(area, h, n)
 319
 320 #else
 321 #define KVMTEST(h, n)
 322 #define KVM_HANDLER(area, h, n)
 323 #define KVM_HANDLER_SKIP(area, h, n)
 324 #endif
 325
 326 #define NOTEST(n)
 327
 328 /*
 329  * The common exception prolog is used for all except a few exceptions
 330  * such as a segment miss on a kernel address.  We have to be prepared
 331  * to take another exception from the point where we first touch the
 332  * kernel stack onwards.
 333  *
 334  * On entry r13 points to the paca, r9-r13 are saved in the paca,
 335  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
 336  * SRR1, and relocation is on.
 337  */
 338 #define EXCEPTION_PROLOG_COMMON(n, area)                                   \
 339         andi.   r10,r12,MSR_PR;         /* See if coming from user      */ \
 340         mr      r10,r1;                 /* Save r1                      */ \
 341         subi    r1,r1,INT_FRAME_SIZE;   /* alloc frame on kernel stack  */ \
 342         beq-    1f;                                                        \
 343         ld      r1,PACAKSAVE(r13);      /* kernel stack to use          */ \
 344 1:      cmpdi   cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace  */ \
 345         blt+    cr1,3f;                 /* abort if it is               */ \
 346         li      r1,(n);                 /* will be reloaded later       */ \
 347         sth     r1,PACA_TRAP_SAVE(r13);                                    \
 348         std     r3,area+EX_R3(r13);                                        \
 349         addi    r3,r13,area;            /* r3 -> where regs are saved*/    \
 350         RESTORE_CTR(r1, area);                                             \
 351         b       bad_stack;                                                 \
 352 3:      std     r9,_CCR(r1);            /* save CR in stackframe        */ \
 353         std     r11,_NIP(r1);           /* save SRR0 in stackframe      */ \
 354         std     r12,_MSR(r1);           /* save SRR1 in stackframe      */ \
 355         std     r10,0(r1);              /* make stack chain pointer     */ \
 356         std     r0,GPR0(r1);            /* save r0 in stackframe        */ \
 357         std     r10,GPR1(r1);           /* save r1 in stackframe        */ \
 358         beq     4f;                     /* if from kernel mode          */ \
 359         ACCOUNT_CPU_USER_ENTRY(r13, r9, r10);                              \
 360         SAVE_PPR(area, r9, r10);                                           \
 361 4:      EXCEPTION_PROLOG_COMMON_2(area)                                    \
 362         EXCEPTION_PROLOG_COMMON_3(n)                                       \
 363         ACCOUNT_STOLEN_TIME
 364
 365 /* Save original regs values from save area to stack frame. */
 366 #define EXCEPTION_PROLOG_COMMON_2(area)                                    \
 367         ld      r9,area+EX_R9(r13);     /* move r9, r10 to stackframe   */ \
 368         ld      r10,area+EX_R10(r13);                                      \
 369         std     r9,GPR9(r1);                                               \
 370         std     r10,GPR10(r1);                                             \
 371         ld      r9,area+EX_R11(r13);    /* move r11 - r13 to stackframe */ \
 372         ld      r10,area+EX_R12(r13);                                      \
 373         ld      r11,area+EX_R13(r13);                                      \
 374         std     r9,GPR11(r1);                                              \
 375         std     r10,GPR12(r1);                                             \
 376         std     r11,GPR13(r1);                                             \
 377         BEGIN_FTR_SECTION_NESTED(66);                                      \
 378         ld      r10,area+EX_CFAR(r13);                                     \
 379         std     r10,ORIG_GPR3(r1);                                         \
 380         END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);            \
 381         GET_CTR(r10, area);                                                \
 382         std     r10,_CTR(r1);
 383
 384 #define EXCEPTION_PROLOG_COMMON_3(n)                                       \
 385         std     r2,GPR2(r1);            /* save r2 in stackframe        */ \
 386         SAVE_4GPRS(3, r1);              /* save r3 - r6 in stackframe   */ \
 387         SAVE_2GPRS(7, r1);              /* save r7, r8 in stackframe    */ \
 388         mflr    r9;                     /* Get LR, later save to stack  */ \
 389         ld      r2,PACATOC(r13);        /* get kernel TOC into r2       */ \
 390         std     r9,_LINK(r1);                                              \
 391         lbz     r10,PACASOFTIRQEN(r13);                            \
 392         mfspr   r11,SPRN_XER;           /* save XER in stackframe       */ \
 393         std     r10,SOFTE(r1);                                             \
 394         std     r11,_XER(r1);                                              \
 395         li      r9,(n)+1;                                                  \
 396         std     r9,_TRAP(r1);           /* set trap number              */ \
 397         li      r10,0;                                                     \
 398         ld      r11,exception_marker@toc(r2);                              \
 399         std     r10,RESULT(r1);         /* clear regs->result           */ \
 400         std     r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame      */
 401
 402 /*
 403  * Exception vectors.
 404  */
 405 #define STD_EXCEPTION_PSERIES(vec, label)                       \
 406         SET_SCRATCH0(r13);              /* save r13 */          \
 407         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 408                                  EXC_STD, KVMTEST_PR, vec);     \
 409
 410 /* Version of above for when we have to branch out-of-line */
 411 #define __OOL_EXCEPTION(vec, label, hdlr)                       \
 412         SET_SCRATCH0(r13)                                       \
 413         EXCEPTION_PROLOG_0(PACA_EXGEN)                          \
 414         b hdlr;
 415
 416 #define STD_EXCEPTION_PSERIES_OOL(vec, label)                   \
 417         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);        \
 418         EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 419
 420 #define STD_EXCEPTION_HV(loc, vec, label)                       \
 421         SET_SCRATCH0(r13);      /* save r13 */                  \
 422         EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,             \
 423                                  EXC_HV, KVMTEST_HV, vec);
 424
 425 #define STD_EXCEPTION_HV_OOL(vec, label)                        \
 426         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 427         EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 428
 429 #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label)    \
 430         /* No guest interrupts come through here */     \
 431         SET_SCRATCH0(r13);              /* save r13 */  \
 432         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_STD, NOTEST, vec);
 433
 434 #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label)             \
 435         EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);            \
 436         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_STD)
 437
 438 #define STD_RELON_EXCEPTION_HV(loc, vec, label)         \
 439         SET_SCRATCH0(r13);      /* save r13 */          \
 440         EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label,       \
 441                                        EXC_HV, KVMTEST_HV, vec);
 442
 443 #define STD_RELON_EXCEPTION_HV_OOL(vec, label)                  \
 444         EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);        \
 445         EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
 446
 447 /* This associate vector numbers with bits in paca->irq_happened */
 448 #define SOFTEN_VALUE_0x500      PACA_IRQ_EE
 449 #define SOFTEN_VALUE_0x900      PACA_IRQ_DEC
 450 #define SOFTEN_VALUE_0x980      PACA_IRQ_DEC
 451 #define SOFTEN_VALUE_0xa00      PACA_IRQ_DBELL
 452 #define SOFTEN_VALUE_0xe80      PACA_IRQ_DBELL
 453 #define SOFTEN_VALUE_0xe60      PACA_IRQ_HMI
 454 #define SOFTEN_VALUE_0xea0      PACA_IRQ_EE
 455
 456 #define __SOFTEN_TEST(h, vec)                                           \
 457         lbz     r10,PACASOFTIRQEN(r13);                                 \
 458         cmpwi   r10,0;                                                  \
 459         li      r10,SOFTEN_VALUE_##vec;                                 \
 460         beq     masked_##h##interrupt
 461
 462 #define _SOFTEN_TEST(h, vec)    __SOFTEN_TEST(h, vec)
 463
 464 #define SOFTEN_TEST_PR(vec)                                             \
 465         KVMTEST(EXC_STD, vec);                                          \
 466         _SOFTEN_TEST(EXC_STD, vec)
 467
 468 #define SOFTEN_TEST_HV(vec)                                             \
 469         KVMTEST(EXC_HV, vec);                                           \
 470         _SOFTEN_TEST(EXC_HV, vec)
 471
 472 #define KVMTEST_PR(vec)                                                 \
 473         KVMTEST(EXC_STD, vec)
 474
 475 #define KVMTEST_HV(vec)                                                 \
 476         KVMTEST(EXC_HV, vec)
 477
 478 #define SOFTEN_NOTEST_PR(vec)           _SOFTEN_TEST(EXC_STD, vec)
 479 #define SOFTEN_NOTEST_HV(vec)           _SOFTEN_TEST(EXC_HV, vec)
 480
 481 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)              \
 482         SET_SCRATCH0(r13);    /* save r13 */                            \
 483         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 484         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);                   \
 485         EXCEPTION_PROLOG_PSERIES_1(label, h);
 486
 487 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)               \
 488         __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)
 489
 490 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label)                     \
 491         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 492                                     EXC_STD, SOFTEN_TEST_PR)
 493
 494 #define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label)                      \
 495         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec);            \
 496         EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
 497
 498 #define MASKABLE_EXCEPTION_HV(loc, vec, label)                          \
 499         _MASKABLE_EXCEPTION_PSERIES(vec, label,                         \
 500                                     EXC_HV, SOFTEN_TEST_HV)
 501
 502 #define MASKABLE_EXCEPTION_HV_OOL(vec, label)                           \
 503         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);            \
 504         EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 505
 506 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)        \
 507         SET_SCRATCH0(r13);    /* save r13 */                            \
 508         EXCEPTION_PROLOG_0(PACA_EXGEN);                                 \
 509         __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);                   \
 510         EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
 511
 512 #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)         \
 513         __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)
 514
 515 #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label)               \
 516         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 517                                           EXC_STD, SOFTEN_NOTEST_PR)
 518
 519 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label)                    \
 520         _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,                   \
 521                                           EXC_HV, SOFTEN_TEST_HV)
 522
 523 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label)                     \
 524         EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);            \
 525         EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
 526
 527 /*
 528  * Our exception common code can be passed various "additions"
 529  * to specify the behaviour of interrupts, whether to kick the
 530  * runlatch, etc...
 531  */
 532
 533 /*
 534  * This addition reconciles our actual IRQ state with the various software
 535  * flags that track it. This may call C code.
 536  */
 537 #define ADD_RECONCILE   RECONCILE_IRQ_STATE(r10,r11)
 538
 539 #define ADD_NVGPRS                              \
 540         bl      save_nvgprs
 541
 542 #define RUNLATCH_ON                             \
 543 BEGIN_FTR_SECTION                               \
 544         CURRENT_THREAD_INFO(r3, r1);            \
 545         ld      r4,TI_LOCAL_FLAGS(r3);          \
 546         andi.   r0,r4,_TLF_RUNLATCH;            \
 547         beql    ppc64_runlatch_on_trampoline;   \
 548 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
 549
 550 #define EXCEPTION_COMMON(trap, label, hdlr, ret, additions)     \
 551         EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);              \
 552         /* Volatile regs are potentially clobbered here */      \
 553         additions;                                              \
 554         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 555         bl      hdlr;                                           \
 556         b       ret
 557
 558 #define STD_EXCEPTION_COMMON(trap, label, hdlr)                 \
 559         EXCEPTION_COMMON(trap, label, hdlr, ret_from_except,    \
 560                          ADD_NVGPRS;ADD_RECONCILE)
 561
 562 /*
 563  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
 564  * in the idle task and therefore need the special idle handling
 565  * (finish nap and runlatch)
 566  */
 567 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)             \
 568         EXCEPTION_COMMON(trap, label, hdlr, ret_from_except_lite, \
 569                          FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)
 570
 571 /*
 572  * When the idle code in power4_idle puts the CPU into NAP mode,
 573  * it has to do so in a loop, and relies on the external interrupt
 574  * and decrementer interrupt entry code to get it out of the loop.
 575  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
 576  * to signal that it is in the loop and needs help to get out.
 577  */
 578 #ifdef CONFIG_PPC_970_NAP
 579 #define FINISH_NAP                              \
 580 BEGIN_FTR_SECTION                               \
 581         CURRENT_THREAD_INFO(r11, r1);           \
 582         ld      r9,TI_LOCAL_FLAGS(r11);         \
 583         andi.   r10,r9,_TLF_NAPPING;            \
 584         bnel    power4_fixup_nap;               \
 585 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 586 #else
 587 #define FINISH_NAP
 588 #endif
 589
 590 #endif  /* _ASM_POWERPC_EXCEPTION_H */