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Exit early if size zero for cache helpers 

This patch enables cache helper functions `flush_dcache_range`,
`clean_dcache_range` and `invalidate_dcache_range` to exit early
if the size argument specified is zero

Change-Id: I0b63e8f4bd3d47ec08bf2a0b0b9a7ff8a269a9b0
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
This commit is contained in:
Soby Mathew 2017-06-15 16:18:45 +01:00
parent ee05ae1680
commit 3ec5204c49
2 changed files with 7 additions and 0 deletions
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4
lib/aarch32/cache_helpers.S
View File

@ -20,6 +20,9 @@
* This macro can be used for implementing various data cache operations `op`
*/
.macro do_dcache_maintenance_by_mva op, coproc, opc1, CRn, CRm, opc2
/* Exit early if size is zero */
cmp r1, #0
beq exit_loop_\op
dcache_line_size r2, r3
add r1, r0, r1
sub r3, r2, #1
@ -30,6 +33,7 @@ loop_\op:
cmp r0, r1
blo loop_\op
dsb sy
exit_loop_\op:
bx lr
.endm

3
lib/aarch64/cache_helpers.S
View File

@ -20,6 +20,8 @@
* This macro can be used for implementing various data cache operations `op`
*/
.macro do_dcache_maintenance_by_mva op
/* Exit early if size is zero */
cbz x1, exit_loop_\op
dcache_line_size x2, x3
add x1, x0, x1
sub x3, x2, #1
@ -30,6 +32,7 @@ loop_\op:
cmp x0, x1
b.lo loop_\op
dsb sy
exit_loop_\op:
ret
.endm
/* ------------------------------------------