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Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 9f1eeb2e7d75..6e644fd68ad2 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1603,6 +1603,24 @@ config THUMB2_AVOID_R_ARM_THM_JUMP11 config ARM_ASM_UNIFIED bool +config ARM_PATCH_IDIV + bool "Runtime patch udiv/sdiv instructions into __aeabi_{u}idiv()" + depends on CPU_32v7 && !XIP_KERNEL + default y + help + The ARM compiler inserts calls to __aeabi_idiv() and + __aeabi_uidiv() when it needs to perform division on signed + and unsigned integers. Some v7 CPUs have support for the sdiv + and udiv instructions that can be used to implement those + functions. + + Enabling this option allows the kernel to modify itself to + replace the first two instructions of these library functions + with the sdiv or udiv plus "bx lr" instructions when the CPU + it is running on supports them. Typically this will be faster + and less power intensive than running the original library + code to do integer division. + config AEABI bool "Use the ARM EABI to compile the kernel" help |