[U-Boot] [RFC 2/6] efi: add RuntimeServicesSupported variable

[AKASHI Takahiro]

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.

Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
---
 include/efi_api.h            | 15 +++++++++++++++
 include/efi_loader.h         |  3 +++
 lib/efi_loader/efi_runtime.c | 28 ++++++++++++++++++++++++++++
 lib/efi_loader/efi_setup.c   |  5 +++++
 4 files changed, 51 insertions(+)

diff --git a/include/efi_api.h b/include/efi_api.h
index 65584dd2d82a..d7d95edd4dfc 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 23ce73226762..7bd8002e303e 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 60442cb21d37..cf202bb9ec07 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -89,6 +89,34 @@ struct elf_rela {
  * handle a good number of runtime callbacks
  */
 
+efi_status_t efi_init_runtime_supported(void)
+{
+	u16 efi_runtime_services_supported;
+
+	/*
+	 * This value must be synced with efi_runtime_detach_list
+	 * as well as efi_runtime_services.
+	 */
+	efi_runtime_services_supported = EFI_RT_SUPPORTED_RESET_SYSTEM;
+#ifdef CONFIG_EFI_GET_TIME
+	efi_runtime_services_supported |= EFI_RT_SUPPORTED_GET_TIME;
+#endif
+#ifdef CONFIG_EFI_SET_TIME
+	efi_runtime_services_supported |= EFI_RT_SUPPORTED_SET_TIME;
+#endif
+#ifdef CONFIG_EFI_RUNTIME_SET_VIRTUAL_ADDRESS_MAP
+	efi_runtime_services_supported |=
+				EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP;
+#endif
+
+	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 45d6aca051f3..75fa344060d5 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -123,6 +123,11 @@ 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)
-- 
2.21.0