mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-11 17:36:49 +07:00
6c70b6fc7b
Check the cpu type in the OBP device tree before committing to using the optimized Niagara memcpy and memset implementation. If we don't recognize the cpu type, use a completely generic version. Signed-off-by: David S. Miller <davem@davemloft.net>
34 lines
874 B
ArmAsm
34 lines
874 B
ArmAsm
/* GENpatch.S: Patch Ultra-I routines with generic variant.
|
|
*
|
|
* Copyright (C) 2007 David S. Miller <davem@davemloft.net>
|
|
*/
|
|
|
|
#define BRANCH_ALWAYS 0x10680000
|
|
#define NOP 0x01000000
|
|
#define GEN_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 generic_patch_copyops
|
|
.type generic_patch_copyops,#function
|
|
generic_patch_copyops:
|
|
GEN_DO_PATCH(memcpy, GENmemcpy)
|
|
GEN_DO_PATCH(___copy_from_user, GENcopy_from_user)
|
|
GEN_DO_PATCH(___copy_to_user, GENcopy_to_user)
|
|
retl
|
|
nop
|
|
.size generic_patch_copyops,.-generic_patch_copyops
|