dbd2fdf549
Just patch the branch at boot time instead. Signed-off-by: David S. Miller <davem@davemloft.net>
253 lines
6 KiB
ArmAsm
253 lines
6 KiB
ArmAsm
/* clear_page.S: UltraSparc optimized copy page.
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*
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* Copyright (C) 1996, 1998, 1999, 2000, 2004 David S. Miller (davem@redhat.com)
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* Copyright (C) 1997 Jakub Jelinek (jakub@redhat.com)
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*/
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#include <asm/visasm.h>
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#include <asm/thread_info.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/spitfire.h>
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#include <asm/head.h>
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/* What we used to do was lock a TLB entry into a specific
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* TLB slot, clear the page with interrupts disabled, then
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* restore the original TLB entry. This was great for
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* disturbing the TLB as little as possible, but it meant
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* we had to keep interrupts disabled for a long time.
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*
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* Now, we simply use the normal TLB loading mechanism,
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* and this makes the cpu choose a slot all by itself.
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* Then we do a normal TLB flush on exit. We need only
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* disable preemption during the clear.
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*/
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#define TTE_BITS_TOP (_PAGE_VALID | _PAGE_SZBITS)
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#define TTE_BITS_BOTTOM (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_L | _PAGE_W)
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#define DCACHE_SIZE (PAGE_SIZE * 2)
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#if (PAGE_SHIFT == 13) || (PAGE_SHIFT == 19)
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#define PAGE_SIZE_REM 0x80
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#elif (PAGE_SHIFT == 16) || (PAGE_SHIFT == 22)
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#define PAGE_SIZE_REM 0x100
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#else
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#error Wrong PAGE_SHIFT specified
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#endif
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#define TOUCH(reg0, reg1, reg2, reg3, reg4, reg5, reg6, reg7) \
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fmovd %reg0, %f48; fmovd %reg1, %f50; \
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fmovd %reg2, %f52; fmovd %reg3, %f54; \
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fmovd %reg4, %f56; fmovd %reg5, %f58; \
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fmovd %reg6, %f60; fmovd %reg7, %f62;
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.text
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.align 32
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.globl copy_user_page
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.type copy_user_page,#function
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copy_user_page: /* %o0=dest, %o1=src, %o2=vaddr */
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lduw [%g6 + TI_PRE_COUNT], %o4
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sethi %uhi(PAGE_OFFSET), %g2
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sethi %hi(PAGE_SIZE), %o3
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sllx %g2, 32, %g2
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sethi %uhi(TTE_BITS_TOP), %g3
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sllx %g3, 32, %g3
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sub %o0, %g2, %g1 ! dest paddr
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sub %o1, %g2, %g2 ! src paddr
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or %g3, TTE_BITS_BOTTOM, %g3
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and %o2, %o3, %o0 ! vaddr D-cache alias bit
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or %g1, %g3, %g1 ! dest TTE data
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or %g2, %g3, %g2 ! src TTE data
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sethi %hi(TLBTEMP_BASE), %o3
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sethi %hi(DCACHE_SIZE), %o1
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add %o0, %o3, %o0 ! dest TTE vaddr
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add %o4, 1, %o2
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add %o0, %o1, %o1 ! src TTE vaddr
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/* Disable preemption. */
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mov TLB_TAG_ACCESS, %g3
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stw %o2, [%g6 + TI_PRE_COUNT]
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/* Load TLB entries. */
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rdpr %pstate, %o2
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wrpr %o2, PSTATE_IE, %pstate
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stxa %o0, [%g3] ASI_DMMU
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stxa %g1, [%g0] ASI_DTLB_DATA_IN
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membar #Sync
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stxa %o1, [%g3] ASI_DMMU
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stxa %g2, [%g0] ASI_DTLB_DATA_IN
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membar #Sync
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wrpr %o2, 0x0, %pstate
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cheetah_copy_page_insn:
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ba,pt %xcc, 9f
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nop
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1:
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VISEntryHalf
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membar #StoreLoad | #StoreStore | #LoadStore
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sethi %hi((PAGE_SIZE/64)-2), %o2
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mov %o0, %g1
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prefetch [%o1 + 0x000], #one_read
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or %o2, %lo((PAGE_SIZE/64)-2), %o2
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prefetch [%o1 + 0x040], #one_read
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prefetch [%o1 + 0x080], #one_read
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prefetch [%o1 + 0x0c0], #one_read
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ldd [%o1 + 0x000], %f0
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prefetch [%o1 + 0x100], #one_read
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ldd [%o1 + 0x008], %f2
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prefetch [%o1 + 0x140], #one_read
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ldd [%o1 + 0x010], %f4
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prefetch [%o1 + 0x180], #one_read
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fmovd %f0, %f16
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ldd [%o1 + 0x018], %f6
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fmovd %f2, %f18
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ldd [%o1 + 0x020], %f8
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fmovd %f4, %f20
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ldd [%o1 + 0x028], %f10
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fmovd %f6, %f22
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ldd [%o1 + 0x030], %f12
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fmovd %f8, %f24
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ldd [%o1 + 0x038], %f14
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fmovd %f10, %f26
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ldd [%o1 + 0x040], %f0
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1: ldd [%o1 + 0x048], %f2
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fmovd %f12, %f28
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ldd [%o1 + 0x050], %f4
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fmovd %f14, %f30
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stda %f16, [%o0] ASI_BLK_P
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ldd [%o1 + 0x058], %f6
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fmovd %f0, %f16
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ldd [%o1 + 0x060], %f8
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fmovd %f2, %f18
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ldd [%o1 + 0x068], %f10
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fmovd %f4, %f20
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ldd [%o1 + 0x070], %f12
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fmovd %f6, %f22
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ldd [%o1 + 0x078], %f14
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fmovd %f8, %f24
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ldd [%o1 + 0x080], %f0
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prefetch [%o1 + 0x180], #one_read
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fmovd %f10, %f26
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subcc %o2, 1, %o2
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add %o0, 0x40, %o0
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bne,pt %xcc, 1b
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add %o1, 0x40, %o1
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ldd [%o1 + 0x048], %f2
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fmovd %f12, %f28
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ldd [%o1 + 0x050], %f4
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fmovd %f14, %f30
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stda %f16, [%o0] ASI_BLK_P
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ldd [%o1 + 0x058], %f6
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fmovd %f0, %f16
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ldd [%o1 + 0x060], %f8
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fmovd %f2, %f18
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ldd [%o1 + 0x068], %f10
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fmovd %f4, %f20
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ldd [%o1 + 0x070], %f12
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fmovd %f6, %f22
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add %o0, 0x40, %o0
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ldd [%o1 + 0x078], %f14
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fmovd %f8, %f24
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fmovd %f10, %f26
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fmovd %f12, %f28
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fmovd %f14, %f30
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stda %f16, [%o0] ASI_BLK_P
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membar #Sync
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VISExitHalf
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ba,pt %xcc, 5f
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nop
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9:
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VISEntry
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ldub [%g6 + TI_FAULT_CODE], %g3
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mov %o0, %g1
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cmp %g3, 0
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rd %asi, %g3
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be,a,pt %icc, 1f
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wr %g0, ASI_BLK_P, %asi
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wr %g0, ASI_BLK_COMMIT_P, %asi
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1: ldda [%o1] ASI_BLK_P, %f0
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add %o1, 0x40, %o1
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ldda [%o1] ASI_BLK_P, %f16
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add %o1, 0x40, %o1
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sethi %hi(PAGE_SIZE), %o2
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1: TOUCH(f0, f2, f4, f6, f8, f10, f12, f14)
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ldda [%o1] ASI_BLK_P, %f32
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stda %f48, [%o0] %asi
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add %o1, 0x40, %o1
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sub %o2, 0x40, %o2
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add %o0, 0x40, %o0
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TOUCH(f16, f18, f20, f22, f24, f26, f28, f30)
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ldda [%o1] ASI_BLK_P, %f0
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stda %f48, [%o0] %asi
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add %o1, 0x40, %o1
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sub %o2, 0x40, %o2
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add %o0, 0x40, %o0
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TOUCH(f32, f34, f36, f38, f40, f42, f44, f46)
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ldda [%o1] ASI_BLK_P, %f16
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stda %f48, [%o0] %asi
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sub %o2, 0x40, %o2
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add %o1, 0x40, %o1
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cmp %o2, PAGE_SIZE_REM
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bne,pt %xcc, 1b
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add %o0, 0x40, %o0
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#if (PAGE_SHIFT == 16) || (PAGE_SHIFT == 22)
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TOUCH(f0, f2, f4, f6, f8, f10, f12, f14)
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ldda [%o1] ASI_BLK_P, %f32
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stda %f48, [%o0] %asi
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add %o1, 0x40, %o1
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sub %o2, 0x40, %o2
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add %o0, 0x40, %o0
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TOUCH(f16, f18, f20, f22, f24, f26, f28, f30)
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ldda [%o1] ASI_BLK_P, %f0
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stda %f48, [%o0] %asi
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add %o1, 0x40, %o1
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sub %o2, 0x40, %o2
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add %o0, 0x40, %o0
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membar #Sync
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stda %f32, [%o0] %asi
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add %o0, 0x40, %o0
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stda %f0, [%o0] %asi
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#else
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membar #Sync
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stda %f0, [%o0] %asi
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add %o0, 0x40, %o0
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stda %f16, [%o0] %asi
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#endif
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membar #Sync
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wr %g3, 0x0, %asi
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VISExit
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5:
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stxa %g0, [%g1] ASI_DMMU_DEMAP
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membar #Sync
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sethi %hi(DCACHE_SIZE), %g2
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stxa %g0, [%g1 + %g2] ASI_DMMU_DEMAP
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membar #Sync
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retl
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stw %o4, [%g6 + TI_PRE_COUNT]
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.size copy_user_page, .-copy_user_page
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.globl cheetah_patch_copy_page
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cheetah_patch_copy_page:
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sethi %hi(0x01000000), %o1 ! NOP
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sethi %hi(cheetah_copy_page_insn), %o0
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or %o0, %lo(cheetah_copy_page_insn), %o0
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stw %o1, [%o0]
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membar #StoreStore
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flush %o0
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retl
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nop
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