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| author |   David S. Miller <davem@davemloft.net> | 2007-08-16 01:47:25 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2007-08-16 01:47:25 -0700 |
| commit | cf5adce11743e98739fcb97e76d688f0b0bc2199 (patch) | |
| tree | 3cea4d74363a6570bbe5aaf4e723e3c256ffb591 /arch/sparc64/lib/NG2page.S | |
| parent | [SPARC64]: Allow userspace to get at the machine description. (diff) | |
| download | linux-dev-cf5adce11743e98739fcb97e76d688f0b0bc2199.tar.xz linux-dev-cf5adce11743e98739fcb97e76d688f0b0bc2199.zip | |
[SPARC64]: Niagara-2 optimized copies.
The bzero/memset implementation stays the same as Niagara-1.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/lib/NG2page.S')
| -rw-r--r-- | arch/sparc64/lib/NG2page.S | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/sparc64/lib/NG2page.S b/arch/sparc64/lib/NG2page.S new file mode 100644 index 000000000000..73b6b7c72cbf --- /dev/null +++ b/arch/sparc64/lib/NG2page.S @@ -0,0 +1,61 @@ +/* NG2page.S: Niagara-2 optimized clear and copy page. + * + * Copyright (C) 2007 (davem@davemloft.net) + */ + +#include <asm/asi.h> +#include <asm/page.h> +#include <asm/visasm.h> + + .text + .align 32 + + /* This is heavily simplified from the sun4u variants + * because Niagara-2 does not have any D-cache aliasing issues. + */ +NG2copy_user_page: /* %o0=dest, %o1=src, %o2=vaddr */ + prefetch [%o1 + 0x00], #one_read + prefetch [%o1 + 0x40], #one_read + VISEntryHalf + set PAGE_SIZE, %g7 + sub %o0, %o1, %g3 +1: stxa %g0, [%o1 + %g3] ASI_BLK_INIT_QUAD_LDD_P + subcc %g7, 64, %g7 + ldda [%o1] ASI_BLK_P, %f0 + stda %f0, [%o1 + %g3] ASI_BLK_P + add %o1, 64, %o1 + bne,pt %xcc, 1b + prefetch [%o1 + 0x40], #one_read + membar #Sync + VISExitHalf + 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 niagara2_patch_pageops + .type niagara2_patch_pageops,#function +niagara2_patch_pageops: + NG_DO_PATCH(copy_user_page, NG2copy_user_page) + NG_DO_PATCH(_clear_page, NGclear_page) + NG_DO_PATCH(clear_user_page, NGclear_user_page) + retl + nop + .size niagara2_patch_pageops,.-niagara2_patch_pageops |