diff options
| author | Abdellatif El Khlifi | 2023-08-04 14:33:37 +0100 |
|---|---|---|
| committer | Tom Rini | 2023-08-08 10:22:03 -0400 |
| commit | d99873517907b806fe35f5a009c2b729c39d5808 (patch) | |
| tree | 551ec2e307e4544087b3743882f838574517d21f /include/linux | |
| parent | a169438411f9277cc689c14078151aa1d1caae3c (diff) | |
arm64: smccc: add support for SMCCCv1.2 x0-x17 registers
add support for x0-x17 registers used by the SMC calls
In SMCCC v1.2 [1] arguments are passed in registers x1-x17.
Results are returned in x0-x17.
This work is inspired from the following kernel commit:
arm64: smccc: Add support for SMCCCv1.2 extended input/output registers
[1]: https://documentation-service.arm.com/static/5f8edaeff86e16515cdbe4c6?token=
Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/arm-smccc.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h index e1d09884a1c..f44e9e8f930 100644 --- a/include/linux/arm-smccc.h +++ b/include/linux/arm-smccc.h @@ -1,6 +1,10 @@ /* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (c) 2015, Linaro Limited + * Copyright 2022-2023 Arm Limited and/or its affiliates <open-source-office@arm.com> + * + * Authors: + * Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com> */ #ifndef __LINUX_ARM_SMCCC_H #define __LINUX_ARM_SMCCC_H @@ -70,6 +74,47 @@ struct arm_smccc_res { unsigned long a3; }; +#ifdef CONFIG_ARM64 +/** + * struct arm_smccc_1_2_regs - Arguments for or Results from SMC 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_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 |