62 lines
1.5 KiB
ArmAsm
62 lines
1.5 KiB
ArmAsm
|
/* 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
|