arch/ia64/kernel/minstate.h

   1
   2 #include <asm/cache.h>
   3
   4 #include "entry.h"
   5 #include "paravirt_inst.h"
   6
   7 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
   8 /* read ar.itc in advance, and use it before leaving bank 0 */
   9 #define ACCOUNT_GET_STAMP                               \
  10 (pUStk) mov.m r20=ar.itc;
  11 #define ACCOUNT_SYS_ENTER                               \
  12 (pUStk) br.call.spnt rp=account_sys_enter               \
  13         ;;
  14 #else
  15 #define ACCOUNT_GET_STAMP
  16 #define ACCOUNT_SYS_ENTER
  17 #endif
  18
  19 .section ".data.patch.rse", "a"
  20 .previous
  21
  22 /*
  23  * DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves
  24  * the minimum state necessary that allows us to turn psr.ic back
  25  * on.
  26  *
  27  * Assumed state upon entry:
  28  *      psr.ic: off
  29  *      r31:    contains saved predicates (pr)
  30  *
  31  * Upon exit, the state is as follows:
  32  *      psr.ic: off
  33  *       r2 = points to &pt_regs.r16
  34  *       r8 = contents of ar.ccv
  35  *       r9 = contents of ar.csd
  36  *      r10 = contents of ar.ssd
  37  *      r11 = FPSR_DEFAULT
  38  *      r12 = kernel sp (kernel virtual address)
  39  *      r13 = points to current task_struct (kernel virtual address)
  40  *      p15 = TRUE if psr.i is set in cr.ipsr
  41  *      predicate registers (other than p2, p3, and p15), b6, r3, r14, r15:
  42  *              preserved
  43  *
  44  * Note that psr.ic is NOT turned on by this macro.  This is so that
  45  * we can pass interruption state as arguments to a handler.
  46  */
  47 #define IA64_NATIVE_DO_SAVE_MIN(__COVER,SAVE_IFS,EXTRA,WORKAROUND)                              \
  48         mov r16=IA64_KR(CURRENT);       /* M */                                                 \
  49         mov r27=ar.rsc;                 /* M */                                                 \
  50         mov r20=r1;                     /* A */                                                 \
  51         mov r25=ar.unat;                /* M */                                                 \
  52         MOV_FROM_IPSR(p0,r29);          /* M */                                                 \
  53         mov r26=ar.pfs;                 /* I */                                                 \
  54         MOV_FROM_IIP(r28);                      /* M */                                         \
  55         mov r21=ar.fpsr;                /* M */                                                 \
  56         __COVER;                                /* B;; (or nothing) */                          \
  57         ;;                                                                                      \
  58         adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16;                                         \
  59         ;;                                                                                      \
  60         ld1 r17=[r16];                          /* load current->thread.on_ustack flag */       \
  61         st1 [r16]=r0;                           /* clear current->thread.on_ustack flag */      \
  62         adds r1=-IA64_TASK_THREAD_ON_USTACK_OFFSET,r16                                          \
  63         /* switch from user to kernel RBS: */                                                   \
  64         ;;                                                                                      \
  65         invala;                         /* M */                                                 \
  66         SAVE_IFS;                                                                               \
  67         cmp.eq pKStk,pUStk=r0,r17;              /* are we in kernel mode already? */            \
  68         ;;                                                                                      \
  69 (pUStk) mov ar.rsc=0;           /* set enforced lazy mode, pl 0, little-endian, loadrs=0 */     \
  70         ;;                                                                                      \
  71 (pUStk) mov.m r24=ar.rnat;                                                                      \
  72 (pUStk) addl r22=IA64_RBS_OFFSET,r1;                    /* compute base of RBS */               \
  73 (pKStk) mov r1=sp;                                      /* get sp  */                           \
  74         ;;                                                                                      \
  75 (pUStk) lfetch.fault.excl.nt1 [r22];                                                            \
  76 (pUStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1;   /* compute base of memory stack */      \
  77 (pUStk) mov r23=ar.bspstore;                            /* save ar.bspstore */                  \
  78         ;;                                                                                      \
  79 (pUStk) mov ar.bspstore=r22;                            /* switch to kernel RBS */              \
  80 (pKStk) addl r1=-IA64_PT_REGS_SIZE,r1;                  /* if in kernel mode, use sp (r12) */   \
  81         ;;                                                                                      \
  82 (pUStk) mov r18=ar.bsp;                                                                         \
  83 (pUStk) mov ar.rsc=0x3;         /* set eager mode, pl 0, little-endian, loadrs=0 */             \
  84         adds r17=2*L1_CACHE_BYTES,r1;           /* really: biggest cache-line size */           \
  85         adds r16=PT(CR_IPSR),r1;                                                                \
  86         ;;                                                                                      \
  87         lfetch.fault.excl.nt1 [r17],L1_CACHE_BYTES;                                             \
  88         st8 [r16]=r29;          /* save cr.ipsr */                                              \
  89         ;;                                                                                      \
  90         lfetch.fault.excl.nt1 [r17];                                                            \
  91         tbit.nz p15,p0=r29,IA64_PSR_I_BIT;                                                      \
  92         mov r29=b0                                                                              \
  93         ;;                                                                                      \
  94         WORKAROUND;                                                                             \
  95         adds r16=PT(R8),r1;     /* initialize first base pointer */                             \
  96         adds r17=PT(R9),r1;     /* initialize second base pointer */                            \
  97 (pKStk) mov r18=r0;             /* make sure r18 isn't NaT */                                   \
  98         ;;                                                                                      \
  99 .mem.offset 0,0; st8.spill [r16]=r8,16;                                                         \
 100 .mem.offset 8,0; st8.spill [r17]=r9,16;                                                         \
 101         ;;                                                                                      \
 102 .mem.offset 0,0; st8.spill [r16]=r10,24;                                                        \
 103 .mem.offset 8,0; st8.spill [r17]=r11,24;                                                        \
 104         ;;                                                                                      \
 105         st8 [r16]=r28,16;       /* save cr.iip */                                               \
 106         st8 [r17]=r30,16;       /* save cr.ifs */                                               \
 107 (pUStk) sub r18=r18,r22;        /* r18=RSE.ndirty*8 */                                          \
 108         mov r8=ar.ccv;                                                                          \
 109         mov r9=ar.csd;                                                                          \
 110         mov r10=ar.ssd;                                                                         \
 111         movl r11=FPSR_DEFAULT;   /* L-unit */                                                   \
 112         ;;                                                                                      \
 113         st8 [r16]=r25,16;       /* save ar.unat */                                              \
 114         st8 [r17]=r26,16;       /* save ar.pfs */                                               \
 115         shl r18=r18,16;         /* compute ar.rsc to be used for "loadrs" */                    \
 116         ;;                                                                                      \
 117         st8 [r16]=r27,16;       /* save ar.rsc */                                               \
 118 (pUStk) st8 [r17]=r24,16;       /* save ar.rnat */                                              \
 119 (pKStk) adds r17=16,r17;        /* skip over ar_rnat field */                                   \
 120         ;;                      /* avoid RAW on r16 & r17 */                                    \
 121 (pUStk) st8 [r16]=r23,16;       /* save ar.bspstore */                                          \
 122         st8 [r17]=r31,16;       /* save predicates */                                           \
 123 (pKStk) adds r16=16,r16;        /* skip over ar_bspstore field */                               \
 124         ;;                                                                                      \
 125         st8 [r16]=r29,16;       /* save b0 */                                                   \
 126         st8 [r17]=r18,16;       /* save ar.rsc value for "loadrs" */                            \
 127         cmp.eq pNonSys,pSys=r0,r0       /* initialize pSys=0, pNonSys=1 */                      \
 128         ;;                                                                                      \
 129 .mem.offset 0,0; st8.spill [r16]=r20,16;        /* save original r1 */                          \
 130 .mem.offset 8,0; st8.spill [r17]=r12,16;                                                        \
 131         adds r12=-16,r1;        /* switch to kernel memory stack (with 16 bytes of scratch) */  \
 132         ;;                                                                                      \
 133 .mem.offset 0,0; st8.spill [r16]=r13,16;                                                        \
 134 .mem.offset 8,0; st8.spill [r17]=r21,16;        /* save ar.fpsr */                              \
 135         mov r13=IA64_KR(CURRENT);       /* establish `current' */                               \
 136         ;;                                                                                      \
 137 .mem.offset 0,0; st8.spill [r16]=r15,16;                                                        \
 138 .mem.offset 8,0; st8.spill [r17]=r14,16;                                                        \
 139         ;;                                                                                      \
 140 .mem.offset 0,0; st8.spill [r16]=r2,16;                                                         \
 141 .mem.offset 8,0; st8.spill [r17]=r3,16;                                                         \
 142         ACCOUNT_GET_STAMP                                                                       \
 143         adds r2=IA64_PT_REGS_R16_OFFSET,r1;                                                     \
 144         ;;                                                                                      \
 145         EXTRA;                                                                                  \
 146         movl r1=__gp;           /* establish kernel global pointer */                           \
 147         ;;                                                                                      \
 148         ACCOUNT_SYS_ENTER                                                                       \
 149         bsw.1;                  /* switch back to bank 1 (must be last in insn group) */        \
 150         ;;
 151
 152 /*
 153  * SAVE_REST saves the remainder of pt_regs (with psr.ic on).
 154  *
 155  * Assumed state upon entry:
 156  *      psr.ic: on
 157  *      r2:     points to &pt_regs.r16
 158  *      r3:     points to &pt_regs.r17
 159  *      r8:     contents of ar.ccv
 160  *      r9:     contents of ar.csd
 161  *      r10:    contents of ar.ssd
 162  *      r11:    FPSR_DEFAULT
 163  *
 164  * Registers r14 and r15 are guaranteed not to be touched by SAVE_REST.
 165  */
 166 #define SAVE_REST                               \
 167 .mem.offset 0,0; st8.spill [r2]=r16,16;         \
 168 .mem.offset 8,0; st8.spill [r3]=r17,16;         \
 169         ;;                                      \
 170 .mem.offset 0,0; st8.spill [r2]=r18,16;         \
 171 .mem.offset 8,0; st8.spill [r3]=r19,16;         \
 172         ;;                                      \
 173 .mem.offset 0,0; st8.spill [r2]=r20,16;         \
 174 .mem.offset 8,0; st8.spill [r3]=r21,16;         \
 175         mov r18=b6;                             \
 176         ;;                                      \
 177 .mem.offset 0,0; st8.spill [r2]=r22,16;         \
 178 .mem.offset 8,0; st8.spill [r3]=r23,16;         \
 179         mov r19=b7;                             \
 180         ;;                                      \
 181 .mem.offset 0,0; st8.spill [r2]=r24,16;         \
 182 .mem.offset 8,0; st8.spill [r3]=r25,16;         \
 183         ;;                                      \
 184 .mem.offset 0,0; st8.spill [r2]=r26,16;         \
 185 .mem.offset 8,0; st8.spill [r3]=r27,16;         \
 186         ;;                                      \
 187 .mem.offset 0,0; st8.spill [r2]=r28,16;         \
 188 .mem.offset 8,0; st8.spill [r3]=r29,16;         \
 189         ;;                                      \
 190 .mem.offset 0,0; st8.spill [r2]=r30,16;         \
 191 .mem.offset 8,0; st8.spill [r3]=r31,32;         \
 192         ;;                                      \
 193         mov ar.fpsr=r11;        /* M-unit */    \
 194         st8 [r2]=r8,8;          /* ar.ccv */    \
 195         adds r24=PT(B6)-PT(F7),r3;              \
 196         ;;                                      \
 197         stf.spill [r2]=f6,32;                   \
 198         stf.spill [r3]=f7,32;                   \
 199         ;;                                      \
 200         stf.spill [r2]=f8,32;                   \
 201         stf.spill [r3]=f9,32;                   \
 202         ;;                                      \
 203         stf.spill [r2]=f10;                     \
 204         stf.spill [r3]=f11;                     \
 205         adds r25=PT(B7)-PT(F11),r3;             \
 206         ;;                                      \
 207         st8 [r24]=r18,16;       /* b6 */        \
 208         st8 [r25]=r19,16;       /* b7 */        \
 209         ;;                                      \
 210         st8 [r24]=r9;           /* ar.csd */    \
 211         st8 [r25]=r10;          /* ar.ssd */    \
 212         ;;
 213
 214 #define RSE_WORKAROUND                          \
 215 (pUStk) extr.u r17=r18,3,6;                     \
 216 (pUStk) sub r16=r18,r22;                        \
 217 [1:](pKStk)     br.cond.sptk.many 1f;           \
 218         .xdata4 ".data.patch.rse",1b-.          \
 219         ;;                                      \
 220         cmp.ge p6,p7 = 33,r17;                  \
 221         ;;                                      \
 222 (p6)    mov r17=0x310;                          \
 223 (p7)    mov r17=0x308;                          \
 224         ;;                                      \
 225         cmp.leu p1,p0=r16,r17;                  \
 226 (p1)    br.cond.sptk.many 1f;                   \
 227         dep.z r17=r26,0,62;                     \
 228         movl r16=2f;                            \
 229         ;;                                      \
 230         mov ar.pfs=r17;                         \
 231         dep r27=r0,r27,16,14;                   \
 232         mov b0=r16;                             \
 233         ;;                                      \
 234         br.ret.sptk b0;                         \
 235         ;;                                      \
 236 2:                                              \
 237         mov ar.rsc=r0                           \
 238         ;;                                      \
 239         flushrs;                                \
 240         ;;                                      \
 241         mov ar.bspstore=r22                     \
 242         ;;                                      \
 243         mov r18=ar.bsp;                         \
 244         ;;                                      \
 245 1:                                              \
 246         .pred.rel "mutex", pKStk, pUStk
 247
 248 #define SAVE_MIN_WITH_COVER     DO_SAVE_MIN(COVER, mov r30=cr.ifs, , RSE_WORKAROUND)
 249 #define SAVE_MIN_WITH_COVER_R19 DO_SAVE_MIN(COVER, mov r30=cr.ifs, mov r15=r19, RSE_WORKAROUND)
 250 #define SAVE_MIN                        DO_SAVE_MIN(     , mov r30=r0, , )