diff options
| author | Soby Mathew <soby.mathew@arm.com> | 2017-06-15 16:18:45 +0100 |
|---|---|---|
| committer | Soby Mathew <soby.mathew@arm.com> | 2017-06-21 17:46:28 +0100 |
| commit | 3ec5204c49ddbc5c1142eda28106a572ca9ed9eb (patch) | |
| tree | 77c90aae959402fa221e6aace7b744a6ab9d0ca2 /lib | |
| parent | ee05ae168061d713129affb93f4d275ff7a0d1d6 (diff) | |
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>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/aarch32/cache_helpers.S | 4 | ||||
| -rw-r--r-- | lib/aarch64/cache_helpers.S | 3 |
2 files changed, 7 insertions, 0 deletions
diff --git a/lib/aarch32/cache_helpers.S b/lib/aarch32/cache_helpers.S index 57b6b384..810af0f0 100644 --- a/lib/aarch32/cache_helpers.S +++ b/lib/aarch32/cache_helpers.S @@ -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 diff --git a/lib/aarch64/cache_helpers.S b/lib/aarch64/cache_helpers.S index eef07a8b..9c40b9db 100644 --- a/lib/aarch64/cache_helpers.S +++ b/lib/aarch64/cache_helpers.S @@ -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 /* ------------------------------------------ |