efi_loader: Add generic PSCI RTS

Now that we have generic PSCI reset and shutdown support in place, we can
advertise those as EFI Run Time Services, allowing efi applications and
OSs to reset and shut down systems.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/cpu/armv8/fwcall.c

@@ -6,6 +6,7 @@
 
 #include <asm-offsets.h>
 #include <config.h>
+#include <efi_loader.h>
 #include <version.h>
 #include <asm/macro.h>
 #include <asm/psci.h>
@@ -17,7 +18,7 @@
  * x0~x7: input arguments
  * x0~x3: output arguments
  */
-static void hvc_call(struct pt_regs *args)
+static void EFI_RUNTIME_TEXT hvc_call(struct pt_regs *args)
 {
 	asm volatile(
 		"ldr x0, %0\n"
@@ -51,7 +52,7 @@ static void hvc_call(struct pt_regs *args)
  * x0~x3: output arguments
  */
 
-void smc_call(struct pt_regs *args)
+void EFI_RUNTIME_TEXT smc_call(struct pt_regs *args)
 {
 	asm volatile(
 		"ldr x0, %0\n"
@@ -81,9 +82,9 @@ void smc_call(struct pt_regs *args)
  * use PSCI on U-Boot running below a hypervisor, please detect
  * this and set the flag accordingly.
  */
-static const bool use_smc_for_psci = true;
+static const EFI_RUNTIME_DATA bool use_smc_for_psci = true;
 
-void __noreturn psci_system_reset(void)
+void __noreturn EFI_RUNTIME_TEXT psci_system_reset(void)
 {
 	struct pt_regs regs;
 
@@ -98,7 +99,7 @@ void __noreturn psci_system_reset(void)
 		;
 }
 
-void __noreturn psci_system_off(void)
+void __noreturn EFI_RUNTIME_TEXT psci_system_off(void)
 {
 	struct pt_regs regs;
 
@@ -118,4 +119,24 @@ void reset_misc(void)
 {
 	psci_system_reset();
 }
+
+#ifdef CONFIG_EFI_LOADER
+void EFI_RUNTIME_TEXT EFIAPI efi_reset_system(
+			enum efi_reset_type reset_type,
+			efi_status_t reset_status,
+			unsigned long data_size, void *reset_data)
+{
+	switch (reset_type) {
+	case EFI_RESET_COLD:
+	case EFI_RESET_WARM:
+		psci_system_reset();
+		break;
+	case EFI_RESET_SHUTDOWN:
+		psci_system_off();
+		break;
+	}
+
+	while (1) { }
+}
+#endif /* CONFIG_EFI_LOADER */
 #endif /* CONFIG_PSCI_RESET */