diff options
| author | Marek Vasut <[email protected]> | 2021-08-30 15:05:23 +0200 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2021-09-23 14:15:32 -0400 |
| commit | 270f8710f92fff3911a830b6c0bcb6fd229ccddd (patch) | |
| tree | 1bc7d5b2e91d9b1a123cc9bee448fb1d33f58c02 /arch | |
| parent | 37479e65a353d6d5328092c092c8dc7dbcd4d001 (diff) | |
crc32: Add crc32 implementation using __builtin_aarch64_crc32b
ARMv8.0 has optional crc32 instruction for crc32 calculation. The
instruction is mandatory since ARMv8.1. The crc32 calculation is
faster using the dedicated instruction, e.g. 1.4 GHz iMX8MN gives:
=> time crc32 0x50000000 0x2000000
time: 0.126 seconds # crc32 instruction
time: 0.213 seconds # software crc32
Add implementation using the compiler builtin wrapper for the crc32
instruction and enable it by default, since we don't support any
platforms which do not implement this instruction.
Signed-off-by: Marek Vasut <[email protected]>
Cc: Simon Glass <[email protected]>
[trini: Make crc32_table guarded by CONFIG_ARM64_CRC32]
Signed-off-by: Tom Rini <[email protected]>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig | 10 | ||||
| -rw-r--r-- | arch/arm/Makefile | 4 |
2 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index f0fd57f8d6d..95102d386b4 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -9,6 +9,16 @@ config ARM64 select PHYS_64BIT select SYS_CACHE_SHIFT_6 +config ARM64_CRC32 + bool "Enable support for CRC32 instruction" + depends on ARM64 + default y + help + ARMv8 implements dedicated crc32 instruction for crc32 calculation. + This is faster than software crc32 calculation. This instruction may + not be present on all ARMv8.0, but is always present on ARMv8.1 and + newer. + config POSITION_INDEPENDENT bool "Generate position-independent pre-relocation code" depends on ARM64 || CPU_V7A diff --git a/arch/arm/Makefile b/arch/arm/Makefile index c68e598a675..ce977bf6323 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -18,7 +18,11 @@ arch-$(CONFIG_CPU_V7A) =$(call cc-option, -march=armv7-a, \ $(call cc-option, -march=armv7)) arch-$(CONFIG_CPU_V7M) =-march=armv7-m arch-$(CONFIG_CPU_V7R) =-march=armv7-r +ifeq ($(CONFIG_ARM64_CRC32),y) +arch-$(CONFIG_ARM64) =-march=armv8-a+crc +else arch-$(CONFIG_ARM64) =-march=armv8-a +endif # On Tegra systems we must build SPL for the armv4 core on the device # but otherwise we can use the value in CONFIG_SYS_ARM_ARCH |