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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
@@ -91,4 +91,29 @@
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);
+struct arm_smccc_1_2_regs {
+ register_t a0;
+ register_t a1;
+ register_t a2;
+ register_t a3;
+ register_t a4;
+ register_t a5;
+ register_t a6;
+ register_t a7;
+ register_t a8;
+ register_t a9;
+ register_t a10;
+ register_t a11;
+ register_t a12;
+ register_t a13;
+ register_t a14;
+ register_t a15;
+ register_t a16;
+ register_t a17;
+};
+
+int arm_smccc_1_2_hvc(const struct arm_smccc_1_2_regs *args,
+ struct arm_smccc_1_2_regs *res);
+int arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args,
+ struct arm_smccc_1_2_regs *res);
#endif /* _PSCI_SMCCC_H_ */
diff --git a/sys/dev/psci/smccc_arm64.S b/sys/dev/psci/smccc_arm64.S
--- a/sys/dev/psci/smccc_arm64.S
+++ b/sys/dev/psci/smccc_arm64.S
@@ -51,3 +51,38 @@
*/
arm_smccc_1_0 hvc
arm_smccc_1_0 smc
+
+.macro arm_smccc_1_2 insn
+ENTRY(arm_smccc_1_2_\insn)
+ stp x1, x19, [sp, #-16]!
+ mov x19, x0
+ ldp x0, x1, [x19, #16 * 0]
+ ldp x2, x3, [x19, #16 * 1]
+ ldp x4, x5, [x19, #16 * 2]
+ ldp x6, x7, [x19, #16 * 3]
+ ldp x8, x9, [x19, #16 * 4]
+ ldp x10, x11, [x19, #16 * 5]
+ ldp x12, x13, [x19, #16 * 6]
+ ldp x14, x15, [x19, #16 * 7]
+ ldp x16, x17, [x19, #16 * 8]
+ \insn #0
+ ldr x19, [sp]
+ cbz x19, 1f
+ stp x0, x1, [x19, #16 * 0]
+ stp x2, x3, [x19, #16 * 1]
+ stp x4, x5, [x19, #16 * 2]
+ stp x6, x7, [x19, #16 * 3]
+ stp x8, x9, [x19, #16 * 4]
+ stp x10, x11, [x19, #16 * 5]
+ stp x12, x13, [x19, #16 * 6]
+ stp x14, x15, [x19, #16 * 7]
+ stp x16, x17, [x19, #16 * 8]
+ ldp xzr, x19, [sp], #16
+1: ret
+END(arm_smccc_1_2\insn)
+.endm
+/* int arm_smccc_1_2_*(const struct arm_smccc_1_2_regs *args,
+ * struct arm_smccc_1_2_regs *res)
+ */
+arm_smccc_1_2 hvc
+arm_smccc_1_2 smc

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