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- /* NGpage.S: Niagara optimize clear and copy page.
- *
- * Copyright (C) 2006 (davem@davemloft.net)
- */
- #include <asm/asi.h>
- #include <asm/page.h>
- .text
- .align 32
- /* This is heavily simplified from the sun4u variants
- * because Niagara does not have any D-cache aliasing issues
- * and also we don't need to use the FPU in order to implement
- * an optimal page copy/clear.
- */
- NGcopy_user_page: /* %o0=dest, %o1=src, %o2=vaddr */
- save %sp, -192, %sp
- rd %asi, %g3
- wr %g0, ASI_BLK_INIT_QUAD_LDD_P, %asi
- set PAGE_SIZE, %g7
- prefetch [%i1 + 0x00], #one_read
- prefetch [%i1 + 0x40], #one_read
- 1: prefetch [%i1 + 0x80], #one_read
- prefetch [%i1 + 0xc0], #one_read
- ldda [%i1 + 0x00] %asi, %o2
- ldda [%i1 + 0x10] %asi, %o4
- ldda [%i1 + 0x20] %asi, %l2
- ldda [%i1 + 0x30] %asi, %l4
- stxa %o2, [%i0 + 0x00] %asi
- stxa %o3, [%i0 + 0x08] %asi
- stxa %o4, [%i0 + 0x10] %asi
- stxa %o5, [%i0 + 0x18] %asi
- stxa %l2, [%i0 + 0x20] %asi
- stxa %l3, [%i0 + 0x28] %asi
- stxa %l4, [%i0 + 0x30] %asi
- stxa %l5, [%i0 + 0x38] %asi
- ldda [%i1 + 0x40] %asi, %o2
- ldda [%i1 + 0x50] %asi, %o4
- ldda [%i1 + 0x60] %asi, %l2
- ldda [%i1 + 0x70] %asi, %l4
- stxa %o2, [%i0 + 0x40] %asi
- stxa %o3, [%i0 + 0x48] %asi
- stxa %o4, [%i0 + 0x50] %asi
- stxa %o5, [%i0 + 0x58] %asi
- stxa %l2, [%i0 + 0x60] %asi
- stxa %l3, [%i0 + 0x68] %asi
- stxa %l4, [%i0 + 0x70] %asi
- stxa %l5, [%i0 + 0x78] %asi
- add %i1, 128, %i1
- subcc %g7, 128, %g7
- bne,pt %xcc, 1b
- add %i0, 128, %i0
- wr %g3, 0x0, %asi
- membar #Sync
- ret
- restore
- .align 32
- .globl NGclear_page
- .globl NGclear_user_page
- NGclear_page: /* %o0=dest */
- NGclear_user_page: /* %o0=dest, %o1=vaddr */
- rd %asi, %g3
- wr %g0, ASI_BLK_INIT_QUAD_LDD_P, %asi
- set PAGE_SIZE, %g7
- 1: stxa %g0, [%o0 + 0x00] %asi
- stxa %g0, [%o0 + 0x08] %asi
- stxa %g0, [%o0 + 0x10] %asi
- stxa %g0, [%o0 + 0x18] %asi
- stxa %g0, [%o0 + 0x20] %asi
- stxa %g0, [%o0 + 0x28] %asi
- stxa %g0, [%o0 + 0x30] %asi
- stxa %g0, [%o0 + 0x38] %asi
- stxa %g0, [%o0 + 0x40] %asi
- stxa %g0, [%o0 + 0x48] %asi
- stxa %g0, [%o0 + 0x50] %asi
- stxa %g0, [%o0 + 0x58] %asi
- stxa %g0, [%o0 + 0x60] %asi
- stxa %g0, [%o0 + 0x68] %asi
- stxa %g0, [%o0 + 0x70] %asi
- stxa %g0, [%o0 + 0x78] %asi
- stxa %g0, [%o0 + 0x80] %asi
- stxa %g0, [%o0 + 0x88] %asi
- stxa %g0, [%o0 + 0x90] %asi
- stxa %g0, [%o0 + 0x98] %asi
- stxa %g0, [%o0 + 0xa0] %asi
- stxa %g0, [%o0 + 0xa8] %asi
- stxa %g0, [%o0 + 0xb0] %asi
- stxa %g0, [%o0 + 0xb8] %asi
- stxa %g0, [%o0 + 0xc0] %asi
- stxa %g0, [%o0 + 0xc8] %asi
- stxa %g0, [%o0 + 0xd0] %asi
- stxa %g0, [%o0 + 0xd8] %asi
- stxa %g0, [%o0 + 0xe0] %asi
- stxa %g0, [%o0 + 0xe8] %asi
- stxa %g0, [%o0 + 0xf0] %asi
- stxa %g0, [%o0 + 0xf8] %asi
- subcc %g7, 256, %g7
- bne,pt %xcc, 1b
- add %o0, 256, %o0
- wr %g3, 0x0, %asi
- membar #Sync
- retl
- nop
- #define BRANCH_ALWAYS 0x10680000
- #define NOP 0x01000000
- #define NG_DO_PATCH(OLD, NEW) \
- sethi %hi(NEW), %g1; \
- or %g1, %lo(NEW), %g1; \
- sethi %hi(OLD), %g2; \
- or %g2, %lo(OLD), %g2; \
- sub %g1, %g2, %g1; \
- sethi %hi(BRANCH_ALWAYS), %g3; \
- sll %g1, 11, %g1; \
- srl %g1, 11 + 2, %g1; \
- or %g3, %lo(BRANCH_ALWAYS), %g3; \
- or %g3, %g1, %g3; \
- stw %g3, [%g2]; \
- sethi %hi(NOP), %g3; \
- or %g3, %lo(NOP), %g3; \
- stw %g3, [%g2 + 0x4]; \
- flush %g2;
- .globl niagara_patch_pageops
- .type niagara_patch_pageops,#function
- niagara_patch_pageops:
- NG_DO_PATCH(copy_user_page, NGcopy_user_page)
- NG_DO_PATCH(_clear_page, NGclear_page)
- NG_DO_PATCH(clear_user_page, NGclear_user_page)
- retl
- nop
- .size niagara_patch_pageops,.-niagara_patch_pageops
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