root/arch/sparc/power/hibernate_asm.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * hibernate_asm.S:  Hibernaton support specific for sparc64.
   4  *
   5  * Copyright (C) 2013 Kirill V Tkhai (tkhai@yandex.ru)
   6  */
   7 
   8 #include <linux/linkage.h>
   9 
  10 #include <asm/asm-offsets.h>
  11 #include <asm/cpudata.h>
  12 #include <asm/page.h>
  13 
  14 ENTRY(swsusp_arch_suspend)
  15         save    %sp, -128, %sp
  16         save    %sp, -128, %sp
  17         flushw
  18 
  19         setuw   saved_context, %g3
  20 
  21         /* Save window regs */
  22         rdpr    %cwp, %g2
  23         stx     %g2, [%g3 + SC_REG_CWP]
  24         rdpr    %wstate, %g2
  25         stx     %g2, [%g3 + SC_REG_WSTATE]
  26         stx     %fp, [%g3 + SC_REG_FP]
  27 
  28         /* Save state regs */
  29         rdpr    %tick, %g2
  30         stx     %g2, [%g3 + SC_REG_TICK]
  31         rdpr    %pstate, %g2
  32         stx     %g2, [%g3 + SC_REG_PSTATE]
  33 
  34         /* Save global regs */
  35         stx     %g4, [%g3 + SC_REG_G4]
  36         stx     %g5, [%g3 + SC_REG_G5]
  37         stx     %g6, [%g3 + SC_REG_G6]
  38 
  39         call    swsusp_save
  40          nop
  41 
  42         mov     %o0, %i0
  43         restore
  44 
  45         mov     %o0, %i0
  46         ret
  47          restore
  48 
  49 ENTRY(swsusp_arch_resume)
  50         /* Write restore_pblist to %l0 */
  51         sethi   %hi(restore_pblist), %l0
  52         ldx     [%l0 + %lo(restore_pblist)], %l0
  53 
  54         call    __flush_tlb_all
  55          nop
  56 
  57         /* Write PAGE_OFFSET to %g7 */
  58         sethi   %hi(PAGE_OFFSET), %g7
  59         ldx     [%g7 + %lo(PAGE_OFFSET)], %g7
  60 
  61         setuw   (PAGE_SIZE-8), %g3
  62 
  63         /* Use MMU Bypass */
  64         rd      %asi, %g1
  65         wr      %g0, ASI_PHYS_USE_EC, %asi
  66 
  67         ba      fill_itlb
  68          nop
  69 
  70 pbe_loop:
  71         cmp     %l0, %g0
  72         be      restore_ctx
  73          sub    %l0, %g7, %l0
  74 
  75         ldxa    [%l0    ] %asi, %l1 /* address */
  76         ldxa    [%l0 + 8] %asi, %l2 /* orig_address */
  77 
  78         /* phys addr */
  79         sub     %l1, %g7, %l1
  80         sub     %l2, %g7, %l2
  81 
  82         mov     %g3, %l3 /* PAGE_SIZE-8 */
  83 copy_loop:
  84         ldxa    [%l1 + %l3] ASI_PHYS_USE_EC, %g2
  85         stxa    %g2, [%l2 + %l3] ASI_PHYS_USE_EC
  86         cmp     %l3, %g0
  87         bne     copy_loop
  88          sub    %l3, 8, %l3
  89 
  90         /* next pbe */
  91         ba      pbe_loop
  92          ldxa   [%l0 + 16] %asi, %l0
  93 
  94 restore_ctx:
  95         setuw   saved_context, %g3
  96 
  97         /* Restore window regs */
  98         wrpr    %g0, 0, %canrestore
  99         wrpr    %g0, 0, %otherwin
 100         wrpr    %g0, 6, %cansave
 101         wrpr    %g0, 0, %cleanwin
 102 
 103         ldxa    [%g3 + SC_REG_CWP] %asi, %g2
 104         wrpr    %g2, %cwp
 105         ldxa    [%g3 + SC_REG_WSTATE] %asi, %g2
 106         wrpr    %g2, %wstate
 107         ldxa    [%g3 + SC_REG_FP] %asi, %fp
 108 
 109         /* Restore state regs */
 110         ldxa    [%g3 + SC_REG_PSTATE] %asi, %g2
 111         wrpr    %g2, %pstate
 112         ldxa    [%g3 + SC_REG_TICK] %asi, %g2
 113         wrpr    %g2, %tick
 114 
 115         /* Restore global regs */
 116         ldxa    [%g3 + SC_REG_G4] %asi, %g4
 117         ldxa    [%g3 + SC_REG_G5] %asi, %g5
 118         ldxa    [%g3 + SC_REG_G6] %asi, %g6
 119 
 120         wr      %g1, %g0, %asi
 121 
 122         restore
 123         restore
 124 
 125         wrpr    %g0, 14, %pil
 126 
 127         retl
 128          mov    %g0, %o0
 129 
 130 fill_itlb:
 131         ba      pbe_loop
 132          wrpr   %g0, 15, %pil