efi_loader: add RuntimeServicesSupported variable

This variable is defined in UEFI specification 2.8, section 8.1.
Its value should be updated whenever we add any usable runtime services
function.

Currently we only support SetVirtualAddress() for all systems and
ResetSystem() for some.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

4 files changed, 47 insertions, 0 deletions

diff --git a/include/efi_api.h b/include/efi_api.h
index 65584dd2d8..d7d95edd4d 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -213,6 +213,21 @@ struct efi_capsule_header {
 	u32 capsule_image_size;
 };
 
+#define EFI_RT_SUPPORTED_GET_TIME			0x0001
+#define EFI_RT_SUPPORTED_SET_TIME			0x0002
+#define EFI_RT_SUPPORTED_GET_WAKEUP_TIME		0x0004
+#define EFI_RT_SUPPORTED_SET_WAKEUP_TIME		0x0008
+#define EFI_RT_SUPPORTED_GET_VARIABLE			0x0010
+#define EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME		0x0020
+#define EFI_RT_SUPPORTED_SET_VARIABLE			0x0040
+#define EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP	0x0080
+#define EFI_RT_SUPPORTED_CONVERT_POINTER		0x0100
+#define EFI_RT_SUPPORTED_GET_NEXT_HIGH_MONOTONIC_COUNT	0x0200
+#define EFI_RT_SUPPORTED_RESET_SYSTEM			0x0400
+#define EFI_RT_SUPPORTED_UPDATE_CAPSULE			0x0800
+#define EFI_RT_SUPPORTED_QUERY_CAPSULE_CAPABILITIES	0x1000
+#define EFI_RT_SUPPORTED_QUERY_VARIABLE_INFO		0x2000
+
 struct efi_runtime_services {
 	struct efi_table_hdr hdr;
 	efi_status_t (EFIAPI *get_time)(struct efi_time *time,
diff --git a/include/efi_loader.h b/include/efi_loader.h
index f0e1313f93..b07155cecb 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -573,6 +573,9 @@ static inline int guidcmp(const efi_guid_t *g1, const efi_guid_t *g2)
 #define __efi_runtime_data __attribute__ ((section (".data.efi_runtime")))
 #define __efi_runtime __attribute__ ((section (".text.efi_runtime")))
 
+/* Indicate supported runtime services */
+efi_status_t efi_init_runtime_supported(void);
+
 /* Update CRC32 in table header */
 void __efi_runtime efi_update_table_header_crc32(struct efi_table_hdr *table);
 
diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 432551d0c8..0c57d0abd7 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -89,6 +89,30 @@ struct elf_rela {
  * handle a good number of runtime callbacks
  */
 
+efi_status_t efi_init_runtime_supported(void)
+{
+	u16 efi_runtime_services_supported = 0;
+
+	/*
+	 * This value must be synced with efi_runtime_detach_list
+	 * as well as efi_runtime_services.
+	 */
+#if CONFIG_IS_ENABLED(ARCH_BCM283X) || \
+    CONFIG_IS_ENABLED(FSL_LAYERSCAPE) || \
+    CONFIG_IS_ENABLED(SYSRESET_X86) || \
+    CONFIG_IS_ENABLED(PSCI_RESET)
+	efi_runtime_services_supported |= EFI_RT_SUPPORTED_RESET_SYSTEM;
+#endif
+	efi_runtime_services_supported |=
+				EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP;
+	return EFI_CALL(efi_set_variable(L"RuntimeServicesSupported",
+					 &efi_global_variable_guid,
+					 EFI_VARIABLE_BOOTSERVICE_ACCESS |
+					 EFI_VARIABLE_RUNTIME_ACCESS,
+					 sizeof(efi_runtime_services_supported),
+					 &efi_runtime_services_supported));
+}
+
 /**
  * efi_update_table_header_crc32() - Update crc32 in table header
  *
diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index 8691d686d2..bfb57836fa 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -117,6 +117,11 @@ efi_status_t efi_init_obj_list(void)
 	if (ret != EFI_SUCCESS)
 		goto out;
 
+	/* Indicate supported runtime services */
+	ret = efi_init_runtime_supported();
+	if (ret != EFI_SUCCESS)
+		goto out;
+
 	/* Initialize system table */
 	ret = efi_initialize_system_table();
 	if (ret != EFI_SUCCESS)