[U-Boot] [RFC 1/6] efi_loader: runtime: make SetVirtualAddressMap configurable

[AKASHI Takahiro <takahiro.akashi@linaro.org>]

OS does not always need to call SetVirtualAddressMap.
(Ard confirmed this on arm64 linux.)
So let this API configurable. If disabled, it will return EFI_UNSUPPORTED
as UEFI specification requires.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
---
 lib/efi_loader/Kconfig       | 7 +++++++
 lib/efi_loader/efi_runtime.c | 8 ++++++++
 2 files changed, 15 insertions(+)

diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index 8bf4b1754d06..bb9c7582b14d 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -44,6 +44,13 @@ config EFI_SET_TIME
 	  Provide the SetTime() runtime service at boottime. This service
 	  can be used by an EFI application to adjust the real time clock.
 
+config EFI_RUNTIME_SET_VIRTUAL_ADDRESS_MAP
+	bool "runtime service: SetVirtualAddressMap"
+	default n
+	help
+	  Enable SetVirtualAddressMap runtime service. This API will be
+	  called by OS just before it enters into virtual address mode.
+
 config EFI_DEVICE_PATH_TO_TEXT
 	bool "Device path to text protocol"
 	default y
diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 9c50955c9bd0..60442cb21d37 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -374,10 +374,12 @@ static const struct efi_runtime_detach_list_struct efi_runtime_detach_list[] = {
 		/* do_reset is gone */
 		.ptr = &efi_runtime_services.reset_system,
 		.patchto = efi_reset_system,
+#ifdef CONFIG_RUNTIME_SET_VIRTUAL_ADDRESS_MAP
 	}, {
 		/* invalidate_*cache_all are gone */
 		.ptr = &efi_runtime_services.set_virtual_address_map,
 		.patchto = &efi_unimplemented,
+#endif
 	}, {
 		/* RTC accessors are gone */
 		.ptr = &efi_runtime_services.get_time,
@@ -512,6 +514,7 @@ void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map)
         invalidate_icache_all();
 }
 
+#ifdef CONFIG_RUNTIME_SET_VIRTUAL_ADDRESS_MAP
 /**
  * efi_set_virtual_address_map() - change from physical to virtual mapping
  *
@@ -619,6 +622,7 @@ static efi_status_t EFIAPI efi_set_virtual_address_map(
 
 	return EFI_EXIT(EFI_INVALID_PARAMETER);
 }
+#endif /* CONFIG_RUNTIME_SET_VIRTUAL_ADDRESS_MAP */
 
 /**
  * efi_add_runtime_mmio() - add memory-mapped IO region
@@ -796,7 +800,11 @@ struct efi_runtime_services __efi_runtime_data efi_runtime_services = {
 	.set_time = &efi_set_time_boottime,
 	.get_wakeup_time = (void *)&efi_unimplemented,
 	.set_wakeup_time = (void *)&efi_unimplemented,
+#ifdef CONFIG_RUNTIME_SET_VIRTUAL_ADDRESS_MAP
 	.set_virtual_address_map = &efi_set_virtual_address_map,
+#else
+	.set_virtual_address_map = (void *)&efi_unimplemented,
+#endif
 	.convert_pointer = (void *)&efi_invalid_parameter,
 	.get_variable = efi_get_variable,
 	.get_next_variable_name = efi_get_next_variable_name,
-- 
2.21.0