diff options
author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-08-18 09:34:28 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-08-18 09:34:28 -0700 |
commit | 5bc705e9fe774be9bb87584644c1f6752ee5ea7e (patch) | |
tree | 5bcab227cc2008df6cfb17533be0a69ffd21e981 /arch/sparc64/lib/NG2page.S | |
parent | 605a494e4df0b2dabdebcdfee99536b0f6a22adc (diff) | |
parent | 405849610fd96b4f34cd1875c4c033228fea6c0f (diff) |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
* 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6:
[MATH-EMU]: Fix underflow exception reporting.
[SPARC64]: Create a HWCAP_SPARC_N2 and report it to userspace on Niagara-2.
[SPARC64]: SMP trampoline needs to avoid %tick_cmpr on sun4v too.
[SPARC64]: Do not touch %tick_cmpr on sun4v cpus.
[SPARC64]: Niagara-2 optimized copies.
[SPARC64]: Allow userspace to get at the machine description.
[SPARC32]: Remove superfluous 'kernel_end' alignment on sun4c.
[SPARC32]: Fix bogus ramdisk image location check.
[SPARC32]: Remove iommu from struct sbus_bus and use archdata like sparc64.
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 00000000000..73b6b7c72cb --- /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 |