root/arch/powerpc/kernel/swsusp_asm64.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * PowerPC 64-bit swsusp implementation
   4  *
   5  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
   6  */
   7 
   8 #include <linux/threads.h>
   9 #include <asm/processor.h>
  10 #include <asm/page.h>
  11 #include <asm/cputable.h>
  12 #include <asm/thread_info.h>
  13 #include <asm/ppc_asm.h>
  14 #include <asm/asm-offsets.h>
  15 #include <asm/feature-fixups.h>
  16 
  17 /*
  18  * Structure for storing CPU registers on the save area.
  19  */
  20 #define SL_r1           0x00    /* stack pointer */
  21 #define SL_PC           0x08
  22 #define SL_MSR          0x10
  23 #define SL_SDR1         0x18
  24 #define SL_XER          0x20
  25 #define SL_TB           0x40
  26 #define SL_r2           0x48
  27 #define SL_CR           0x50
  28 #define SL_LR           0x58
  29 #define SL_r12          0x60
  30 #define SL_r13          0x68
  31 #define SL_r14          0x70
  32 #define SL_r15          0x78
  33 #define SL_r16          0x80
  34 #define SL_r17          0x88
  35 #define SL_r18          0x90
  36 #define SL_r19          0x98
  37 #define SL_r20          0xa0
  38 #define SL_r21          0xa8
  39 #define SL_r22          0xb0
  40 #define SL_r23          0xb8
  41 #define SL_r24          0xc0
  42 #define SL_r25          0xc8
  43 #define SL_r26          0xd0
  44 #define SL_r27          0xd8
  45 #define SL_r28          0xe0
  46 #define SL_r29          0xe8
  47 #define SL_r30          0xf0
  48 #define SL_r31          0xf8
  49 #define SL_SPRG1        0x100
  50 #define SL_TCR          0x108
  51 #define SL_SIZE         SL_TCR+8
  52 
  53 /* these macros rely on the save area being
  54  * pointed to by r11 */
  55 
  56 #define SAVE_SPR(register)              \
  57         mfspr   r0, SPRN_##register     ;\
  58         std     r0, SL_##register(r11)
  59 #define RESTORE_SPR(register)           \
  60         ld      r0, SL_##register(r11)  ;\
  61         mtspr   SPRN_##register, r0
  62 #define SAVE_SPECIAL(special)           \
  63         mf##special     r0              ;\
  64         std     r0, SL_##special(r11)
  65 #define RESTORE_SPECIAL(special)        \
  66         ld      r0, SL_##special(r11)   ;\
  67         mt##special     r0
  68 #define SAVE_REGISTER(reg)              \
  69         std     reg, SL_##reg(r11)
  70 #define RESTORE_REGISTER(reg)           \
  71         ld      reg, SL_##reg(r11)
  72 
  73 /* space for storing cpu state */
  74         .section .data
  75         .align  5
  76 swsusp_save_area:
  77         .space SL_SIZE
  78 
  79         .section ".toc","aw"
  80 swsusp_save_area_ptr:
  81         .tc     swsusp_save_area[TC],swsusp_save_area
  82 restore_pblist_ptr:
  83         .tc     restore_pblist[TC],restore_pblist
  84 
  85         .section .text
  86         .align  5
  87 _GLOBAL(swsusp_arch_suspend)
  88         ld      r11,swsusp_save_area_ptr@toc(r2)
  89         SAVE_SPECIAL(LR)
  90         SAVE_REGISTER(r1)
  91         SAVE_SPECIAL(CR)
  92         SAVE_SPECIAL(TB)
  93         SAVE_REGISTER(r2)
  94         SAVE_REGISTER(r12)
  95         SAVE_REGISTER(r13)
  96         SAVE_REGISTER(r14)
  97         SAVE_REGISTER(r15)
  98         SAVE_REGISTER(r16)
  99         SAVE_REGISTER(r17)
 100         SAVE_REGISTER(r18)
 101         SAVE_REGISTER(r19)
 102         SAVE_REGISTER(r20)
 103         SAVE_REGISTER(r21)
 104         SAVE_REGISTER(r22)
 105         SAVE_REGISTER(r23)
 106         SAVE_REGISTER(r24)
 107         SAVE_REGISTER(r25)
 108         SAVE_REGISTER(r26)
 109         SAVE_REGISTER(r27)
 110         SAVE_REGISTER(r28)
 111         SAVE_REGISTER(r29)
 112         SAVE_REGISTER(r30)
 113         SAVE_REGISTER(r31)
 114         SAVE_SPECIAL(MSR)
 115         SAVE_SPECIAL(XER)
 116 #ifdef CONFIG_PPC_BOOK3S_64
 117 BEGIN_FW_FTR_SECTION
 118         SAVE_SPECIAL(SDR1)
 119 END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR)
 120 #else
 121         SAVE_SPR(TCR)
 122 
 123         /* Save SPRG1, SPRG1 be used save paca */
 124         SAVE_SPR(SPRG1)
 125 #endif
 126 
 127         /* we push the stack up 128 bytes but don't store the
 128          * stack pointer on the stack like a real stackframe */
 129         addi    r1,r1,-128
 130 
 131         bl _iommu_save
 132         bl swsusp_save
 133 
 134         /* restore LR */
 135         ld      r11,swsusp_save_area_ptr@toc(r2)
 136         RESTORE_SPECIAL(LR)
 137         addi    r1,r1,128
 138 
 139         blr
 140 
 141 /* Resume code */
 142 _GLOBAL(swsusp_arch_resume)
 143         /* Stop pending alitvec streams and memory accesses */
 144 BEGIN_FTR_SECTION
 145         DSSALL
 146 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
 147         sync
 148 
 149         ld      r12,restore_pblist_ptr@toc(r2)
 150         ld      r12,0(r12)
 151 
 152         cmpdi   r12,0
 153         beq-    nothing_to_copy
 154         li      r15,PAGE_SIZE>>3
 155 copyloop:
 156         ld      r13,pbe_address(r12)
 157         ld      r14,pbe_orig_address(r12)
 158 
 159         mtctr   r15
 160         li      r10,0
 161 copy_page_loop:
 162         ldx     r0,r10,r13
 163         stdx    r0,r10,r14
 164         addi    r10,r10,8
 165         bdnz copy_page_loop
 166 
 167         ld      r12,pbe_next(r12)
 168         cmpdi   r12,0
 169         bne+    copyloop
 170 nothing_to_copy:
 171 
 172 #ifdef CONFIG_PPC_BOOK3S_64
 173         /* flush caches */
 174         lis     r3, 0x10
 175         mtctr   r3
 176         li      r3, 0
 177         ori     r3, r3, CONFIG_KERNEL_START>>48
 178         li      r0, 48
 179         sld     r3, r3, r0
 180         li      r0, 0
 181 1:
 182         dcbf    0,r3
 183         addi    r3,r3,0x20
 184         bdnz    1b
 185 
 186         sync
 187 
 188         tlbia
 189 #endif
 190 
 191         ld      r11,swsusp_save_area_ptr@toc(r2)
 192 
 193         RESTORE_SPECIAL(CR)
 194 
 195         /* restore timebase */
 196         /* load saved tb */
 197         ld      r1, SL_TB(r11)
 198         /* get upper 32 bits of it */
 199         srdi    r2, r1, 32
 200         /* clear tb lower to avoid wrap */
 201         li      r0, 0
 202         mttbl   r0
 203         /* set tb upper */
 204         mttbu   r2
 205         /* set tb lower */
 206         mttbl   r1
 207 
 208         /* restore registers */
 209         RESTORE_REGISTER(r1)
 210         RESTORE_REGISTER(r2)
 211         RESTORE_REGISTER(r12)
 212         RESTORE_REGISTER(r13)
 213         RESTORE_REGISTER(r14)
 214         RESTORE_REGISTER(r15)
 215         RESTORE_REGISTER(r16)
 216         RESTORE_REGISTER(r17)
 217         RESTORE_REGISTER(r18)
 218         RESTORE_REGISTER(r19)
 219         RESTORE_REGISTER(r20)
 220         RESTORE_REGISTER(r21)
 221         RESTORE_REGISTER(r22)
 222         RESTORE_REGISTER(r23)
 223         RESTORE_REGISTER(r24)
 224         RESTORE_REGISTER(r25)
 225         RESTORE_REGISTER(r26)
 226         RESTORE_REGISTER(r27)
 227         RESTORE_REGISTER(r28)
 228         RESTORE_REGISTER(r29)
 229         RESTORE_REGISTER(r30)
 230         RESTORE_REGISTER(r31)
 231 
 232 #ifdef CONFIG_PPC_BOOK3S_64
 233         /* can't use RESTORE_SPECIAL(MSR) */
 234         ld      r0, SL_MSR(r11)
 235         mtmsrd  r0, 0
 236 BEGIN_FW_FTR_SECTION
 237         RESTORE_SPECIAL(SDR1)
 238 END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR)
 239 #else
 240         /* Restore SPRG1, be used to save paca */
 241         ld      r0, SL_SPRG1(r11)
 242         mtsprg  1, r0
 243 
 244         RESTORE_SPECIAL(MSR)
 245 
 246         /* Restore TCR and clear any pending bits in TSR. */
 247         RESTORE_SPR(TCR)
 248         lis     r0, (TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS)@h
 249         mtspr   SPRN_TSR, r0
 250 
 251         /* Kick decrementer */
 252         li      r0, 1
 253         mtdec   r0
 254 
 255         /* Invalidate all tlbs */
 256         bl      _tlbil_all
 257 #endif
 258         RESTORE_SPECIAL(XER)
 259 
 260         sync
 261 
 262         addi    r1,r1,-128
 263 #ifdef CONFIG_PPC_BOOK3S_64
 264         bl      slb_flush_and_restore_bolted
 265 #endif
 266         bl      do_after_copyback
 267         addi    r1,r1,128
 268 
 269         ld      r11,swsusp_save_area_ptr@toc(r2)
 270         RESTORE_SPECIAL(LR)
 271 
 272         li      r3, 0
 273         blr