root/arch/sparc/lib/copy_page.S

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   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* clear_page.S: UltraSparc optimized copy page.
   3  *
   4  * Copyright (C) 1996, 1998, 1999, 2000, 2004 David S. Miller (davem@redhat.com)
   5  * Copyright (C) 1997 Jakub Jelinek (jakub@redhat.com)
   6  */
   7 
   8 #include <asm/visasm.h>
   9 #include <asm/thread_info.h>
  10 #include <asm/page.h>
  11 #include <asm/pgtable.h>
  12 #include <asm/spitfire.h>
  13 #include <asm/head.h>
  14 #include <asm/export.h>
  15 
  16         /* What we used to do was lock a TLB entry into a specific
  17          * TLB slot, clear the page with interrupts disabled, then
  18          * restore the original TLB entry.  This was great for
  19          * disturbing the TLB as little as possible, but it meant
  20          * we had to keep interrupts disabled for a long time.
  21          *
  22          * Now, we simply use the normal TLB loading mechanism,
  23          * and this makes the cpu choose a slot all by itself.
  24          * Then we do a normal TLB flush on exit.  We need only
  25          * disable preemption during the clear.
  26          */
  27 
  28 #define DCACHE_SIZE     (PAGE_SIZE * 2)
  29 
  30 #if (PAGE_SHIFT == 13)
  31 #define PAGE_SIZE_REM   0x80
  32 #elif (PAGE_SHIFT == 16)
  33 #define PAGE_SIZE_REM   0x100
  34 #else
  35 #error Wrong PAGE_SHIFT specified
  36 #endif
  37 
  38 #define TOUCH(reg0, reg1, reg2, reg3, reg4, reg5, reg6, reg7)   \
  39         fsrc2   %reg0, %f48;    fsrc2   %reg1, %f50;            \
  40         fsrc2   %reg2, %f52;    fsrc2   %reg3, %f54;            \
  41         fsrc2   %reg4, %f56;    fsrc2   %reg5, %f58;            \
  42         fsrc2   %reg6, %f60;    fsrc2   %reg7, %f62;
  43 
  44         .text
  45 
  46         .align          32
  47         .globl          copy_user_page
  48         .type           copy_user_page,#function
  49         EXPORT_SYMBOL(copy_user_page)
  50 copy_user_page:         /* %o0=dest, %o1=src, %o2=vaddr */
  51         lduw            [%g6 + TI_PRE_COUNT], %o4
  52         sethi           %hi(PAGE_OFFSET), %g2
  53         sethi           %hi(PAGE_SIZE), %o3
  54 
  55         ldx             [%g2 + %lo(PAGE_OFFSET)], %g2
  56         sethi           %hi(PAGE_KERNEL_LOCKED), %g3
  57 
  58         ldx             [%g3 + %lo(PAGE_KERNEL_LOCKED)], %g3
  59         sub             %o0, %g2, %g1           ! dest paddr
  60 
  61         sub             %o1, %g2, %g2           ! src paddr
  62 
  63         and             %o2, %o3, %o0           ! vaddr D-cache alias bit
  64         or              %g1, %g3, %g1           ! dest TTE data
  65 
  66         or              %g2, %g3, %g2           ! src TTE data
  67         sethi           %hi(TLBTEMP_BASE), %o3
  68 
  69         sethi           %hi(DCACHE_SIZE), %o1
  70         add             %o0, %o3, %o0           ! dest TTE vaddr
  71 
  72         add             %o4, 1, %o2
  73         add             %o0, %o1, %o1           ! src TTE vaddr
  74 
  75         /* Disable preemption.  */
  76         mov             TLB_TAG_ACCESS, %g3
  77         stw             %o2, [%g6 + TI_PRE_COUNT]
  78 
  79         /* Load TLB entries.  */
  80         rdpr            %pstate, %o2
  81         wrpr            %o2, PSTATE_IE, %pstate
  82         stxa            %o0, [%g3] ASI_DMMU
  83         stxa            %g1, [%g0] ASI_DTLB_DATA_IN
  84         membar          #Sync
  85         stxa            %o1, [%g3] ASI_DMMU
  86         stxa            %g2, [%g0] ASI_DTLB_DATA_IN
  87         membar          #Sync
  88         wrpr            %o2, 0x0, %pstate
  89 
  90 cheetah_copy_page_insn:
  91         ba,pt           %xcc, 9f
  92          nop
  93 
  94 1:
  95         VISEntryHalf
  96         membar          #StoreLoad | #StoreStore | #LoadStore
  97         sethi           %hi((PAGE_SIZE/64)-2), %o2
  98         mov             %o0, %g1
  99         prefetch        [%o1 + 0x000], #one_read
 100         or              %o2, %lo((PAGE_SIZE/64)-2), %o2
 101         prefetch        [%o1 + 0x040], #one_read
 102         prefetch        [%o1 + 0x080], #one_read
 103         prefetch        [%o1 + 0x0c0], #one_read
 104         ldd             [%o1 + 0x000], %f0
 105         prefetch        [%o1 + 0x100], #one_read
 106         ldd             [%o1 + 0x008], %f2
 107         prefetch        [%o1 + 0x140], #one_read
 108         ldd             [%o1 + 0x010], %f4
 109         prefetch        [%o1 + 0x180], #one_read
 110         fsrc2           %f0, %f16
 111         ldd             [%o1 + 0x018], %f6
 112         fsrc2           %f2, %f18
 113         ldd             [%o1 + 0x020], %f8
 114         fsrc2           %f4, %f20
 115         ldd             [%o1 + 0x028], %f10
 116         fsrc2           %f6, %f22
 117         ldd             [%o1 + 0x030], %f12
 118         fsrc2           %f8, %f24
 119         ldd             [%o1 + 0x038], %f14
 120         fsrc2           %f10, %f26
 121         ldd             [%o1 + 0x040], %f0
 122 1:      ldd             [%o1 + 0x048], %f2
 123         fsrc2           %f12, %f28
 124         ldd             [%o1 + 0x050], %f4
 125         fsrc2           %f14, %f30
 126         stda            %f16, [%o0] ASI_BLK_P
 127         ldd             [%o1 + 0x058], %f6
 128         fsrc2           %f0, %f16
 129         ldd             [%o1 + 0x060], %f8
 130         fsrc2           %f2, %f18
 131         ldd             [%o1 + 0x068], %f10
 132         fsrc2           %f4, %f20
 133         ldd             [%o1 + 0x070], %f12
 134         fsrc2           %f6, %f22
 135         ldd             [%o1 + 0x078], %f14
 136         fsrc2           %f8, %f24
 137         ldd             [%o1 + 0x080], %f0
 138         prefetch        [%o1 + 0x180], #one_read
 139         fsrc2           %f10, %f26
 140         subcc           %o2, 1, %o2
 141         add             %o0, 0x40, %o0
 142         bne,pt          %xcc, 1b
 143          add            %o1, 0x40, %o1
 144 
 145         ldd             [%o1 + 0x048], %f2
 146         fsrc2           %f12, %f28
 147         ldd             [%o1 + 0x050], %f4
 148         fsrc2           %f14, %f30
 149         stda            %f16, [%o0] ASI_BLK_P
 150         ldd             [%o1 + 0x058], %f6
 151         fsrc2           %f0, %f16
 152         ldd             [%o1 + 0x060], %f8
 153         fsrc2           %f2, %f18
 154         ldd             [%o1 + 0x068], %f10
 155         fsrc2           %f4, %f20
 156         ldd             [%o1 + 0x070], %f12
 157         fsrc2           %f6, %f22
 158         add             %o0, 0x40, %o0
 159         ldd             [%o1 + 0x078], %f14
 160         fsrc2           %f8, %f24
 161         fsrc2           %f10, %f26
 162         fsrc2           %f12, %f28
 163         fsrc2           %f14, %f30
 164         stda            %f16, [%o0] ASI_BLK_P
 165         membar          #Sync
 166         VISExitHalf
 167         ba,pt           %xcc, 5f
 168          nop
 169 
 170 9:
 171         VISEntry
 172         ldub            [%g6 + TI_FAULT_CODE], %g3
 173         mov             %o0, %g1
 174         cmp             %g3, 0
 175         rd              %asi, %g3
 176         be,a,pt         %icc, 1f
 177          wr             %g0, ASI_BLK_P, %asi
 178         wr              %g0, ASI_BLK_COMMIT_P, %asi
 179 1:      ldda            [%o1] ASI_BLK_P, %f0
 180         add             %o1, 0x40, %o1
 181         ldda            [%o1] ASI_BLK_P, %f16
 182         add             %o1, 0x40, %o1
 183         sethi           %hi(PAGE_SIZE), %o2
 184 1:      TOUCH(f0, f2, f4, f6, f8, f10, f12, f14)
 185         ldda            [%o1] ASI_BLK_P, %f32
 186         stda            %f48, [%o0] %asi
 187         add             %o1, 0x40, %o1
 188         sub             %o2, 0x40, %o2
 189         add             %o0, 0x40, %o0
 190         TOUCH(f16, f18, f20, f22, f24, f26, f28, f30)
 191         ldda            [%o1] ASI_BLK_P, %f0
 192         stda            %f48, [%o0] %asi
 193         add             %o1, 0x40, %o1
 194         sub             %o2, 0x40, %o2
 195         add             %o0, 0x40, %o0
 196         TOUCH(f32, f34, f36, f38, f40, f42, f44, f46)
 197         ldda            [%o1] ASI_BLK_P, %f16
 198         stda            %f48, [%o0] %asi
 199         sub             %o2, 0x40, %o2
 200         add             %o1, 0x40, %o1
 201         cmp             %o2, PAGE_SIZE_REM
 202         bne,pt          %xcc, 1b
 203          add            %o0, 0x40, %o0
 204 #if (PAGE_SHIFT == 16)
 205         TOUCH(f0, f2, f4, f6, f8, f10, f12, f14)
 206         ldda            [%o1] ASI_BLK_P, %f32
 207         stda            %f48, [%o0] %asi
 208         add             %o1, 0x40, %o1
 209         sub             %o2, 0x40, %o2
 210         add             %o0, 0x40, %o0
 211         TOUCH(f16, f18, f20, f22, f24, f26, f28, f30)
 212         ldda            [%o1] ASI_BLK_P, %f0
 213         stda            %f48, [%o0] %asi
 214         add             %o1, 0x40, %o1
 215         sub             %o2, 0x40, %o2
 216         add             %o0, 0x40, %o0
 217         membar          #Sync
 218         stda            %f32, [%o0] %asi
 219         add             %o0, 0x40, %o0
 220         stda            %f0, [%o0] %asi
 221 #else
 222         membar          #Sync
 223         stda            %f0, [%o0] %asi
 224         add             %o0, 0x40, %o0
 225         stda            %f16, [%o0] %asi
 226 #endif
 227         membar          #Sync
 228         wr              %g3, 0x0, %asi
 229         VISExit
 230 
 231 5:
 232         stxa            %g0, [%g1] ASI_DMMU_DEMAP
 233         membar          #Sync
 234 
 235         sethi           %hi(DCACHE_SIZE), %g2
 236         stxa            %g0, [%g1 + %g2] ASI_DMMU_DEMAP
 237         membar          #Sync
 238 
 239         retl
 240          stw            %o4, [%g6 + TI_PRE_COUNT]
 241 
 242         .size           copy_user_page, .-copy_user_page
 243 
 244         .globl          cheetah_patch_copy_page
 245 cheetah_patch_copy_page:
 246         sethi           %hi(0x01000000), %o1    ! NOP
 247         sethi           %hi(cheetah_copy_page_insn), %o0
 248         or              %o0, %lo(cheetah_copy_page_insn), %o0
 249         stw             %o1, [%o0]
 250         membar          #StoreStore
 251         flush           %o0
 252         retl
 253          nop

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