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efi_loader: let the variable driver patch out the runtime

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Our variable services are only provided at boottime. Therefore when
leaving boottime the variable function are replaced by dummy functions
returning EFI_UNSUPPORTED. Move this patching of the runtime table to the
variable services implementation. Executed it in ExitBootServices().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-06-20 15:25:48 +02:00
parent 24a238f763
commit 29018abb09
4 changed files with 48 additions and 10 deletions
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2
include/efi_loader.h
View file

@ -327,6 +327,8 @@ extern struct list_head efi_register_notify_events;
efi_status_t efi_init_obj_list(void);
/* Initialize variable services */
efi_status_t efi_init_variables(void);
/* Notify ExitBootServices() is called */
void efi_variables_boot_exit_notify(void);
/* Called by bootefi to initialize root node */
efi_status_t efi_root_node_register(void);
/* Called by bootefi to initialize runtime */

3
lib/efi_loader/efi_boottime.c
View file

@ -1968,7 +1968,8 @@ static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle,
/* Make sure that notification functions are not called anymore */
efi_tpl = TPL_HIGH_LEVEL;
/* TODO: Should persist EFI variables here */
/* Notify variable services */
efi_variables_boot_exit_notify();
board_quiesce_devices();

9
lib/efi_loader/efi_runtime.c
View file

@ -408,15 +408,6 @@ static const struct efi_runtime_detach_list_struct efi_runtime_detach_list[] = {
}, {
.ptr = &efi_runtime_services.set_time,
.patchto = &efi_set_time,
}, {
.ptr = &efi_runtime_services.get_variable,
.patchto = &efi_device_error,
}, {
.ptr = &efi_runtime_services.get_next_variable_name,
.patchto = &efi_device_error,
}, {
.ptr = &efi_runtime_services.set_variable,
.patchto = &efi_device_error,
}
};

44
lib/efi_loader/efi_variable.c
View file

@ -548,6 +548,50 @@ efi_status_t __efi_runtime EFIAPI efi_query_variable_info(
return EFI_UNSUPPORTED;
}
/**
* efi_get_variable_runtime() - runtime implementation of GetVariable()
*/
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;
}
/**
* efi_get_next_variable_name_runtime() - runtime implementation of
* GetNextVariable()
*/
static efi_status_t __efi_runtime EFIAPI
efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size,
u16 *variable_name, const efi_guid_t *vendor)
{
return EFI_UNSUPPORTED;
}
/**
* efi_set_variable_runtime() - runtime implementation of SetVariable()
*/
static efi_status_t __efi_runtime EFIAPI
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;
}
/**
* efi_variables_boot_exit_notify() - notify ExitBootServices() is called
*/
void efi_variables_boot_exit_notify(void)
{
efi_runtime_services.get_variable = efi_get_variable_runtime;
efi_runtime_services.get_next_variable_name =
efi_get_next_variable_name_runtime;
efi_runtime_services.set_variable = efi_set_variable_runtime;
efi_update_table_header_crc32(&efi_runtime_services.hdr);
}
/**
* efi_init_variables() - initialize variable services
*