diff options
| author | Kristina Martsenko <kristina.martsenko@arm.com> | 2024-09-30 17:10:51 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2024-10-17 16:42:51 +0100 |
| commit | ce6b5ff5f16dd9267d62d09b3af3f0c7dc3c24f0 (patch) | |
| tree | 6d39cb89756a35b3accf70489c2350d996e3efb0 | |
| parent | 836ed3c4e473fef9e0814a2ba6dd40f9656c03f1 (diff) | |
arm64: lib: Use MOPS for copy_page() and clear_page()
Similarly to what was done to the memcpy() routines, make copy_page()
and clear_page() also use the Armv8.8 FEAT_MOPS instructions.
Note: For copy_page() this uses the CPY* instructions instead of CPYF*
as CPYF* doesn't allow src and dst to be equal. It's not clear if
copy_page() needs to allow equal src and dst but it has worked so far
with the current implementation and there is no documentation forbidding
it.
Note, the unoptimized version of copy_page() in assembler.h is left as
it is.
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Link: https://lore.kernel.org/r/20240930161051.3777828-6-kristina.martsenko@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
| -rw-r--r-- | arch/arm64/lib/clear_page.S | 13 | ||||
| -rw-r--r-- | arch/arm64/lib/copy_page.S | 13 |
2 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm64/lib/clear_page.S b/arch/arm64/lib/clear_page.S index ebde40e7fa2b..bd6f7d5eb6eb 100644 --- a/arch/arm64/lib/clear_page.S +++ b/arch/arm64/lib/clear_page.S @@ -15,6 +15,19 @@ * x0 - dest */ SYM_FUNC_START(__pi_clear_page) +#ifdef CONFIG_AS_HAS_MOPS + .arch_extension mops +alternative_if_not ARM64_HAS_MOPS + b .Lno_mops +alternative_else_nop_endif + + mov x1, #PAGE_SIZE + setpn [x0]!, x1!, xzr + setmn [x0]!, x1!, xzr + seten [x0]!, x1!, xzr + ret +.Lno_mops: +#endif mrs x1, dczid_el0 tbnz x1, #4, 2f /* Branch if DC ZVA is prohibited */ and w1, w1, #0xf diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S index 6a56d7cf309d..e6374e7e5511 100644 --- a/arch/arm64/lib/copy_page.S +++ b/arch/arm64/lib/copy_page.S @@ -18,6 +18,19 @@ * x1 - src */ SYM_FUNC_START(__pi_copy_page) +#ifdef CONFIG_AS_HAS_MOPS + .arch_extension mops +alternative_if_not ARM64_HAS_MOPS + b .Lno_mops +alternative_else_nop_endif + + mov x2, #PAGE_SIZE + cpypwn [x0]!, [x1]!, x2! + cpymwn [x0]!, [x1]!, x2! + cpyewn [x0]!, [x1]!, x2! + ret +.Lno_mops: +#endif ldp x2, x3, [x1] ldp x4, x5, [x1, #16] ldp x6, x7, [x1, #32] |