[PATCH 15/16] efi_loader: enable UEFI variables at runtime

Heinrich Schuchardt
2020-03-31T06:05:40Z

Enable UEFI variables at runtime.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
---
lib/efi_loader/efi_runtime.c | 6 +++++-
lib/efi_loader/efi_variable.c | 23 +++++++++++++++++------
2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 664a0422e2..acd644202d 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -120,8 +120,12 @@ efi_status_t efi_init_runtime_supported(void)
rt_table->version = EFI_RT_PROPERTIES_TABLE_VERSION;
rt_table->length = sizeof(struct efi_rt_properties_table);
rt_table->runtime_services_supported =
+ EFI_RT_SUPPORTED_GET_VARIABLE |
+ EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME |
+ EFI_RT_SUPPORTED_SET_VARIABLE |
EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP |
- EFI_RT_SUPPORTED_CONVERT_POINTER;
+ EFI_RT_SUPPORTED_CONVERT_POINTER |
+ EFI_RT_SUPPORTED_QUERY_VARIABLE_INFO;

/*
* This value must be synced with efi_runtime_detach_list
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
index 7c39542968..cf8b44c535 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -326,15 +326,13 @@ efi_status_t __efi_runtime EFIAPI efi_query_variable_info(
u64 *remaining_variable_storage_size,
u64 *maximum_variable_size)
{
- /*
*maximum_variable_storage_size = EFI_VAR_BUF_SIZE -
sizeof(struct efi_var_file);
*remaining_variable_storage_size = efi_var_mem_free();
*maximum_variable_size = EFI_VAR_BUF_SIZE -
sizeof(struct efi_var_file) -
sizeof(struct efi_var_entry);
- */
- return EFI_UNSUPPORTED;
+ return EFI_SUCCESS;
}

/**
@@ -351,7 +349,8 @@ static efi_status_t __efi_runtime EFIAPI
efi_get_variable_runtime(u16 *variable_name, const efi_guid_t *vendor,
u32 *attributes, efi_uintn_t *data_size, void *data)
{
- return EFI_UNSUPPORTED;
+ return efi_get_variable_int(variable_name, vendor, attributes,
+ data_size, data);
}

/**
@@ -367,7 +366,8 @@ static efi_status_t __efi_runtime EFIAPI
efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size,
u16 *variable_name, efi_guid_t *vendor)
{
- return EFI_UNSUPPORTED;
+ return efi_get_next_variable_name_int(variable_name_size, variable_name,
+ vendor);
}

/**
@@ -385,7 +385,18 @@ efi_set_variable_runtime(u16 *variable_name, const efi_guid_t *vendor,
u32 attributes, efi_uintn_t data_size,
const void *data)
{
- return EFI_UNSUPPORTED;
+ const u32 required_attributes = EFI_VARIABLE_NON_VOLATILE |
+ EFI_VARIABLE_BOOTSERVICE_ACCESS |
+ EFI_VARIABLE_RUNTIME_ACCESS;
+
+ if (attributes &&
+ (attributes & required_attributes) != required_attributes)
+ return EFI_INVALID_PARAMETER;
+ if ((attributes & ~(u32)EFI_VARIABLE_MASK))
+ return EFI_INVALID_PARAMETER;
+
+ return efi_set_variable_rt_int(variable_name, vendor, attributes,
+ data_size, data);
}

/**
--
2.25.1