1. 硬件架構(gòu)

arm64

2. 內(nèi)核版本

4.19

3. 分析相關(guān)函數(shù)

get_set_conduit_method()

->?of_property_read_string(np, "method", &method))

->?set_conduit(PSCI_CONDUIT_HVC) 或set_conduit(PSCI_CONDUIT_SMC),根據(jù)設(shè)備樹中的method屬性來設(shè)定，

設(shè)定invoke_psci_fn回調(diào)函數(shù)(__invoke_psci_fn_smc或者_(dá)_invoke_psci_fn_hvc)

__invoke_psci_fn_smc()

->?arm_smccc_smc(),這是個(gè)宏定義，如下;

#define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)

->__arm_smccc_smc(),定義在arch/arm64/kernel/smccc-call.S中:

.macro SMCCC instr

.cfi_startproc

\instr #0

ldr x4, [sp]

stp x0, x1, [x4, #ARM_SMCCC_RES_X0_OFFS]

stp x2, x3, [x4, #ARM_SMCCC_RES_X2_OFFS]

ldr x4, [sp, #8]

cbz x4, 1f /* no quirk structure */

ldr x9, [x4, #ARM_SMCCC_QUIRK_ID_OFFS]

cmp x9, #ARM_SMCCC_QUIRK_QCOM_A6

b.ne 1f

str x6, [x4, ARM_SMCCC_QUIRK_STATE_OFFS]

1: ret

.cfi_endproc

.endm

/*

* void arm_smccc_smc(unsigned long a0, unsigned long a1, unsigned long a2,

* unsigned long a3, unsigned long a4, unsigned long a5,

* unsigned long a6, unsigned long a7, struct arm_smccc_res *res,

* struct arm_smccc_quirk *quirk)

*/

ENTRY(__arm_smccc_smc)

SMCCC smc

ENDPROC(__arm_smccc_smc)

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