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arm64: smccc: Add support for SMCCCv1.2 extended input/output registers

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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>
This commit is contained in:
Sudeep Holla 2021-05-18 17:36:18 +01:00 • committed by Will Deacon
parent 6efb943b86
commit 3fdc0cb59d
3 changed files with 121 additions and 0 deletions
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55
include/linux/arm-smccc.h
View file

@ -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