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https://github.com/edk2-porting/linux-next.git
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24d559cac4
The manual says that it is required and we actually have crash reports where loads see stale data due to not having membars here. In one case the networking does: memset(skb, 0, offsetof(struct sk_buff, truesize)); and then some code later checks skb->nohdr for zero, but it's still the value that was there before the memset(). Note that arch/sparc64/lib/xor.S already got this right. Signed-off-by: David S. Miller <davem@davemloft.net>
99 lines
2.6 KiB
ArmAsm
99 lines
2.6 KiB
ArmAsm
/* NGpage.S: Niagara optimize clear and copy page.
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*
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* Copyright (C) 2006 (davem@davemloft.net)
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*/
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#include <asm/asi.h>
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#include <asm/page.h>
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.text
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.align 32
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/* This is heavily simplified from the sun4u variants
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* because Niagara does not have any D-cache aliasing issues
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* and also we don't need to use the FPU in order to implement
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* an optimal page copy/clear.
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*/
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NGcopy_user_page: /* %o0=dest, %o1=src, %o2=vaddr */
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prefetch [%o1 + 0x00], #one_read
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mov 8, %g1
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mov 16, %g2
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mov 24, %g3
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set PAGE_SIZE, %g7
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1: ldda [%o1 + %g0] ASI_BLK_INIT_QUAD_LDD_P, %o2
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ldda [%o1 + %g2] ASI_BLK_INIT_QUAD_LDD_P, %o4
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prefetch [%o1 + 0x40], #one_read
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add %o1, 32, %o1
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stxa %o2, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
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stxa %o3, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
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ldda [%o1 + %g0] ASI_BLK_INIT_QUAD_LDD_P, %o2
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stxa %o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
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stxa %o5, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
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ldda [%o1 + %g2] ASI_BLK_INIT_QUAD_LDD_P, %o4
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add %o1, 32, %o1
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add %o0, 32, %o0
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stxa %o2, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
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stxa %o3, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
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stxa %o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
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stxa %o5, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
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subcc %g7, 64, %g7
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bne,pt %xcc, 1b
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add %o0, 32, %o0
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membar #Sync
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retl
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nop
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NGclear_page: /* %o0=dest */
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NGclear_user_page: /* %o0=dest, %o1=vaddr */
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mov 8, %g1
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mov 16, %g2
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mov 24, %g3
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set PAGE_SIZE, %g7
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1: stxa %g0, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
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stxa %g0, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
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stxa %g0, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
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stxa %g0, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
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add %o0, 32, %o0
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stxa %g0, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
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stxa %g0, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P
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stxa %g0, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
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stxa %g0, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
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subcc %g7, 64, %g7
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bne,pt %xcc, 1b
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add %o0, 32, %o0
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membar #Sync
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retl
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nop
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#define BRANCH_ALWAYS 0x10680000
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#define NOP 0x01000000
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#define NG_DO_PATCH(OLD, NEW) \
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sethi %hi(NEW), %g1; \
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or %g1, %lo(NEW), %g1; \
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sethi %hi(OLD), %g2; \
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or %g2, %lo(OLD), %g2; \
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sub %g1, %g2, %g1; \
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sethi %hi(BRANCH_ALWAYS), %g3; \
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sll %g1, 11, %g1; \
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srl %g1, 11 + 2, %g1; \
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or %g3, %lo(BRANCH_ALWAYS), %g3; \
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or %g3, %g1, %g3; \
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stw %g3, [%g2]; \
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sethi %hi(NOP), %g3; \
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or %g3, %lo(NOP), %g3; \
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stw %g3, [%g2 + 0x4]; \
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flush %g2;
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.globl niagara_patch_pageops
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.type niagara_patch_pageops,#function
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niagara_patch_pageops:
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NG_DO_PATCH(copy_user_page, NGcopy_user_page)
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NG_DO_PATCH(_clear_page, NGclear_page)
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NG_DO_PATCH(clear_user_page, NGclear_user_page)
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retl
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nop
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.size niagara_patch_pageops,.-niagara_patch_pageops
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