NG4patch.S
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/* NG4patch.S: Patch Ultra-I routines with Niagara-4 variant.
*
* Copyright (C) 2012 David S. Miller <davem@davemloft.net>
*/
#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 niagara4_patch_copyops
.type niagara4_patch_copyops,#function
niagara4_patch_copyops:
NG_DO_PATCH(memcpy, NG4memcpy)
NG_DO_PATCH(___copy_from_user, NG4copy_from_user)
NG_DO_PATCH(___copy_to_user, NG4copy_to_user)
retl
nop
.size niagara4_patch_copyops,.-niagara4_patch_copyops
.globl niagara4_patch_bzero
.type niagara4_patch_bzero,#function
niagara4_patch_bzero:
NG_DO_PATCH(memset, NG4memset)
NG_DO_PATCH(__bzero, NG4bzero)
NG_DO_PATCH(__clear_user, NGclear_user)
NG_DO_PATCH(tsb_init, NGtsb_init)
retl
nop
.size niagara4_patch_bzero,.-niagara4_patch_bzero
.globl niagara4_patch_pageops
.type niagara4_patch_pageops,#function
niagara4_patch_pageops:
NG_DO_PATCH(copy_user_page, NG4copy_user_page)
NG_DO_PATCH(_clear_page, NG4clear_page)
NG_DO_PATCH(clear_user_page, NG4clear_user_page)
retl
nop
.size niagara4_patch_pageops,.-niagara4_patch_pageops