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| author | Alexandre Ghiti <alexghiti@rivosinc.com> | 2024-11-03 15:51:43 +0100 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-11-11 07:33:10 -0800 |
| commit | 38acdee32d23f789e866488c99867fd497d43c86 (patch) | |
| tree | f64aabe557031bb7e65be738a935858583227530 /arch/riscv/Kconfig | |
| parent | af042c457db07db4bc1baa5c22d089cab69cfc5b (diff) | |
riscv: Implement cmpxchg32/64() using Zacas
This adds runtime support for Zacas in cmpxchg operations.
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Andrea Parri <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/20241103145153.105097-4-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 62545946ecf4..3542efe3088b 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -632,6 +632,22 @@ config RISCV_ISA_ZAWRS use of these instructions in the kernel when the Zawrs extension is detected at boot. +config TOOLCHAIN_HAS_ZACAS + bool + default y + depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zacas) + depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zacas) + depends on AS_HAS_OPTION_ARCH + +config RISCV_ISA_ZACAS + bool "Zacas extension support for atomic CAS" + depends on TOOLCHAIN_HAS_ZACAS + depends on RISCV_ALTERNATIVE + default y + help + Enable the use of the Zacas ISA-extension to implement kernel atomic + cmpxchg operations when it is detected at boot. + If you don't know what to do here, say Y. config TOOLCHAIN_HAS_ZBB |