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/* U3patch.S: Patch Ultra-I routines with Ultra-III variant.
*
* Copyright (C) 2004 David S. Miller <davem@redhat.com>
*/
#define BRANCH_ALWAYS 0x10680000
#define NOP 0x01000000
#define ULTRA3_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; \
srl %g1, 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 cheetah_patch_copyops
.type cheetah_patch_copyops,#function
cheetah_patch_copyops:
ULTRA3_DO_PATCH(memcpy, U3memcpy)
ULTRA3_DO_PATCH(___copy_from_user, U3copy_from_user)
ULTRA3_DO_PATCH(___copy_to_user, U3copy_to_user)
retl
nop
.size cheetah_patch_copyops,.-cheetah_patch_copyops
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