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efi_loader: factor out efi_set_load_options()

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The bootefi bootmgr command has to set the load options for a loaded image
from the value of BootXXXX variable. If the boot manager is not used, the
value is set from the environment variable bootargs (or efi_selftest).

Factor out a common function efi_set_load_options().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-08-07 17:47:13 +02:00
parent dd92aad81c
commit 1064d04920
3 changed files with 54 additions and 36 deletions
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55
cmd/bootefi.c
View File

@ -31,55 +31,37 @@ static struct efi_device_path *bootefi_image_path;
static struct efi_device_path *bootefi_device_path;
/**
* Set the load options of an image from an environment variable.
* efi_env_set_load_options() - set load options from environment variable
*
* @handle: the image handle
* @env_var: name of the environment variable
* @load_options: pointer to load options (output)
* Return: status code
*/
static efi_status_t set_load_options(efi_handle_t handle, const char *env_var,
u16 **load_options)
static efi_status_t efi_env_set_load_options(efi_handle_t handle,
const char *env_var,
u16 **load_options)
{
struct efi_loaded_image *loaded_image_info;
size_t size;
const char *env = env_get(env_var);
size_t size;
u16 *pos;
efi_status_t ret;
*load_options = NULL;
ret = EFI_CALL(systab.boottime->open_protocol(
handle,
&efi_guid_loaded_image,
(void **)&loaded_image_info,
efi_root, NULL,
EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
if (ret != EFI_SUCCESS)
return EFI_INVALID_PARAMETER;
loaded_image_info->load_options = NULL;
loaded_image_info->load_options_size = 0;
if (!env)
goto out;
size = utf8_utf16_strlen(env) + 1;
loaded_image_info->load_options = calloc(size, sizeof(u16));
if (!loaded_image_info->load_options) {
log_err("ERROR: Out of memory\n");
EFI_CALL(systab.boottime->close_protocol(handle,
&efi_guid_loaded_image,
efi_root, NULL));
return EFI_SUCCESS;
size = sizeof(u16) * (utf8_utf16_strlen(env) + 1);
pos = calloc(size, 1);
if (!pos)
return EFI_OUT_OF_RESOURCES;
}
pos = loaded_image_info->load_options;
*load_options = pos;
utf8_utf16_strcpy(&pos, env);
loaded_image_info->load_options_size = size * 2;
out:
return EFI_CALL(systab.boottime->close_protocol(handle,
&efi_guid_loaded_image,
efi_root, NULL));
ret = efi_set_load_options(handle, size, *load_options);
if (ret != EFI_SUCCESS) {
free(*load_options);
*load_options = NULL;
}
return ret;
}
#if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
@ -336,7 +318,7 @@ static efi_status_t do_bootefi_exec(efi_handle_t handle)
u16 *load_options;
/* Transfer environment variable as load options */
ret = set_load_options(handle, "bootargs", &load_options);
ret = efi_env_set_load_options(handle, "bootargs", &load_options);
if (ret != EFI_SUCCESS)
return ret;
@ -509,8 +491,9 @@ static efi_status_t bootefi_run_prepare(const char *load_options_path,
return ret;
/* Transfer environment variable as load options */
return set_load_options((efi_handle_t)*image_objp, load_options_path,
&load_options);
return efi_env_set_load_options((efi_handle_t)*image_objp,
load_options_path,
&load_options);
}
/**

3
include/efi_loader.h
View File

@ -717,6 +717,9 @@ struct efi_load_option {
efi_status_t efi_deserialize_load_option(struct efi_load_option *lo, u8 *data,
efi_uintn_t *size);
unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data);
efi_status_t efi_set_load_options(efi_handle_t handle,
efi_uintn_t load_options_size,
void *load_options);
efi_status_t efi_bootmgr_load(efi_handle_t *handle);
/**

32
lib/efi_loader/efi_bootmgr.c
View File

@ -30,6 +30,38 @@ static const struct efi_runtime_services *rs;
* should do normal or recovery boot.
*/
/**
* efi_set_load_options() - set the load options of a loaded image
*
* @handle: the image handle
* @load_options_size: size of load options
* @load_options: pointer to load options
* Return: status code
*/
efi_status_t efi_set_load_options(efi_handle_t handle,
efi_uintn_t load_options_size,
void *load_options)
{
struct efi_loaded_image *loaded_image_info;
efi_status_t ret;
ret = EFI_CALL(systab.boottime->open_protocol(
handle,
&efi_guid_loaded_image,
(void **)&loaded_image_info,
efi_root, NULL,
EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
if (ret != EFI_SUCCESS)
return EFI_INVALID_PARAMETER;
loaded_image_info->load_options = load_options;
loaded_image_info->load_options_size = load_options_size;
return EFI_CALL(systab.boottime->close_protocol(handle,
&efi_guid_loaded_image,
efi_root, NULL));
}
/**
* efi_deserialize_load_option() - parse serialized data