arm: kernel: Add SMC structure parameter
This patch adds a quirk parameter to the arm_smccc_(smc/hvc) calls. The quirk structure allows for specialized SMC operations due to SoC specific requirements. The current arm_smccc_(smc/hvc) is renamed and macros are used instead to specify the standard arm_smccc_(smc/hvc) or the arm_smccc_(smc/hvc)_quirk function. This patch and partial implementation was suggested by Will Deacon. Signed-off-by: Andy Gross <andy.gross@linaro.org> Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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@@ -72,33 +72,57 @@ struct arm_smccc_res {
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};
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/**
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* arm_smccc_smc() - make SMC calls
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* struct arm_smccc_quirk - Contains quirk information
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* @id: quirk identification
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* @state: quirk specific information
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* @a6: Qualcomm quirk entry for returning post-smc call contents of a6
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*/
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struct arm_smccc_quirk {
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int id;
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union {
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unsigned long a6;
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} state;
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};
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/**
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* __arm_smccc_smc() - make SMC calls
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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* @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
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*
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* This function is used to make SMC calls following SMC Calling Convention.
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* The content of the supplied param are copied to registers 0 to 7 prior
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* to the SMC instruction. The return values are updated with the content
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* from register 0 to 3 on return from the SMC instruction.
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* from register 0 to 3 on return from the SMC instruction. An optional
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* quirk structure provides vendor specific behavior.
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*/
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asmlinkage void arm_smccc_smc(unsigned long a0, unsigned long a1,
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asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
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unsigned long a2, unsigned long a3, unsigned long a4,
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unsigned long a5, unsigned long a6, unsigned long a7,
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struct arm_smccc_res *res);
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struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
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/**
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* arm_smccc_hvc() - make HVC calls
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* __arm_smccc_hvc() - make HVC calls
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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*
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* This function is used to make HVC calls following SMC Calling
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* Convention. The content of the supplied param are copied to registers 0
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* to 7 prior to the HVC instruction. The return values are updated with
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* the content from register 0 to 3 on return from the HVC instruction.
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* the content from register 0 to 3 on return from the HVC instruction. An
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* optional quirk structure provides vendor specific behavior.
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*/
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asmlinkage void arm_smccc_hvc(unsigned long a0, unsigned long a1,
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asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
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unsigned long a2, unsigned long a3, unsigned long a4,
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unsigned long a5, unsigned long a6, unsigned long a7,
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struct arm_smccc_res *res);
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struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
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#define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
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#define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
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#define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
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#define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
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#endif /*__LINUX_ARM_SMCCC_H*/
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