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diff --git a/sys/dev/psci/smccc.h b/sys/dev/psci/smccc.h
--- a/sys/dev/psci/smccc.h
+++ b/sys/dev/psci/smccc.h
@@ -91,6 +91,38 @@
int arm_smccc_hvc(register_t, register_t, register_t, register_t, register_t,
register_t, register_t, register_t, struct arm_smccc_res *res);
+#define arm_smccc_invoke_1(func, a0, res) \
+ func(a0, 0, 0, 0, 0, 0, 0, 0, res)
+#define arm_smccc_invoke_2(func, a0, a1, res) \
+ func(a0, a1, 0, 0, 0, 0, 0, 0, res)
+#define arm_smccc_invoke_3(func, a0, a1, a2, res) \
+ func(a0, a1, a2, 0, 0, 0, 0, 0, res)
+#define arm_smccc_invoke_4(func, a0, a1, a2, a3, res) \
+ func(a0, a1, a2, a3, 0, 0, 0, 0, res)
+#define arm_smccc_invoke_5(func, a0, a1, a2, a3, a4, res) \
+ func(a0, a1, a2, a3, a4, 0, 0, 0, res)
+#define arm_smccc_invoke_6(func, a0, a1, a2, a3, a4, a5, res) \
+ func(a0, a1, a2, a3, a4, a5, 0, 0, res)
+#define arm_smccc_invoke_7(func, a0, a1, a2, a3, a4, a5, a6, res) \
+ func(a0, a1, a2, a3, a4, a5, a6, 0, res)
+#define arm_smccc_invoke_8(func, a0, a1, a2, a3, a4, a5, a6, a7, res) \
+ func(a0, a1, a2, a3, a4, a5, a6, a7, res)
+
+#define _arm_smccc_invoke_macro(_1, _2, _3, _4, _5, _6, _7, _8, NAME, ...) \
+ NAME
+#define _arm_smccc_invoke(func, a0, ...) \
+ _arm_smccc_invoke_macro(__VA_ARGS__, arm_smccc_invoke_8, \
+ arm_smccc_invoke_7, arm_smccc_invoke_6, arm_smccc_invoke_5, \
+ arm_smccc_invoke_4, arm_smccc_invoke_3, arm_smccc_invoke_2, \
+ arm_smccc_invoke_1)(func, a0, __VA_ARGS__)
+
+#define arm_smccc_invoke_hvc(a0, ...) \
+ _arm_smccc_invoke(arm_smccc_hvc, a0, __VA_ARGS__)
+#define arm_smccc_invoke_smc(a0, ...) \
+ _arm_smccc_invoke(arm_smccc_smc, a0, __VA_ARGS__)
+#define arm_smccc_invoke(a0, ...) \
+ _arm_smccc_invoke(psci_callfn, a0, __VA_ARGS__)
+
struct arm_smccc_1_2_regs {
register_t a0;
register_t a1;

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