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author | Sudeep Holla <sudeep.holla@arm.com> | 2021-05-18 19:36:18 +0300 |
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committer | Will Deacon <will@kernel.org> | 2021-05-26 19:14:09 +0300 |
commit | 3fdc0cb59d97f87e2cc708d424f1538e31744286 (patch) | |
tree | ae9d695494b9c66a9c6f6f67926ab26c32a1efd0 /include/linux/arm-smccc.h | |
parent | 6efb943b8616ec53a5e444193dccf1af9ad627b5 (diff) | |
download | linux-3fdc0cb59d97f87e2cc708d424f1538e31744286.tar.xz |
arm64: smccc: Add support for SMCCCv1.2 extended input/output registers
SMCCC v1.2 allows x8-x17 to be used as parameter registers and x4—x17
to be used as result registers in SMC64/HVC64. Arm Firmware Framework
for Armv8-A specification makes use of x0-x7 as parameter and result
registers. There are other users like Hyper-V who intend to use beyond
x0-x7 as well.
Current SMCCC interface in the kernel just use x0-x7 as parameter and
x0-x3 as result registers as required by SMCCCv1.0. Let us add new
interface to support this extended set of input/output registers namely
x0-x17 as both parameter and result registers.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210518163618.43950-1-sudeep.holla@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'include/linux/arm-smccc.h')
-rw-r--r-- | include/linux/arm-smccc.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h index 6861489a1890..5cef2b8b0479 100644 --- a/include/linux/arm-smccc.h +++ b/include/linux/arm-smccc.h @@ -227,6 +227,61 @@ struct arm_smccc_res { unsigned long a3; }; +#ifdef CONFIG_ARM64 +/** + * struct arm_smccc_1_2_regs - Arguments for or Results from SMC/HVC call + * @a0-a17 argument values from registers 0 to 17 + */ +struct arm_smccc_1_2_regs { + unsigned long a0; + unsigned long a1; + unsigned long a2; + unsigned long a3; + unsigned long a4; + unsigned long a5; + unsigned long a6; + unsigned long a7; + unsigned long a8; + unsigned long a9; + unsigned long a10; + unsigned long a11; + unsigned long a12; + unsigned long a13; + unsigned long a14; + unsigned long a15; + unsigned long a16; + unsigned long a17; +}; + +/** + * arm_smccc_1_2_hvc() - make HVC calls + * @args: arguments passed via struct arm_smccc_1_2_regs + * @res: result values via struct arm_smccc_1_2_regs + * + * This function is used to make HVC calls following SMC Calling Convention + * v1.2 or above. The content of the supplied param are copied from the + * structure to registers prior to the HVC instruction. The return values + * are updated with the content from registers on return from the HVC + * instruction. + */ +asmlinkage void arm_smccc_1_2_hvc(const struct arm_smccc_1_2_regs *args, + struct arm_smccc_1_2_regs *res); + +/** + * arm_smccc_1_2_smc() - make SMC calls + * @args: arguments passed via struct arm_smccc_1_2_regs + * @res: result values via struct arm_smccc_1_2_regs + * + * This function is used to make SMC calls following SMC Calling Convention + * v1.2 or above. The content of the supplied param are copied from the + * structure to registers prior to the SMC instruction. The return values + * are updated with the content from registers on return from the SMC + * instruction. + */ +asmlinkage void arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args, + struct arm_smccc_1_2_regs *res); +#endif + /** * struct arm_smccc_quirk - Contains quirk information * @id: quirk identification |