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efi_loader: carve out efi_load_image_from_file()

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efi_load_image_from_file() should read via either of:

* EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
* EFI_LOAD_FILE_PROTOCOL
* EFI_LOAD_FILE2_PROTOCOL

To make the code readable carve out a function to load the image via the
file system protocol.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-12-06 10:47:57 +01:00
parent c06c55b1f5
commit 0e074d1239
1 changed files with 36 additions and 9 deletions
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45
lib/efi_loader/efi_boottime.c
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@ -1855,32 +1855,26 @@ out:
} }
/** /**
* efi_load_image_from_path() - load an image using a file path * efi_load_image_from_file() - load an image from file system
* *
* Read a file into a buffer allocated as EFI_BOOT_SERVICES_DATA. It is the * Read a file into a buffer allocated as EFI_BOOT_SERVICES_DATA. It is the
* callers obligation to update the memory type as needed. * callers obligation to update the memory type as needed.
* *
* @boot_policy: true for request originating from the boot manager
* @file_path: the path of the image to load * @file_path: the path of the image to load
* @buffer: buffer containing the loaded image * @buffer: buffer containing the loaded image
* @size: size of the loaded image * @size: size of the loaded image
* Return: status code * Return: status code
*/ */
static static
efi_status_t efi_load_image_from_path(bool boot_policy, efi_status_t efi_load_image_from_file(struct efi_device_path *file_path,
struct efi_device_path *file_path,
void **buffer, efi_uintn_t *size) void **buffer, efi_uintn_t *size)
{ {
struct efi_file_info *info = NULL; struct efi_file_info *info = NULL;
struct efi_file_handle *f; struct efi_file_handle *f;
static efi_status_t ret; efi_status_t ret;
u64 addr; u64 addr;
efi_uintn_t bs; efi_uintn_t bs;
/* In case of failure nothing is returned */
*buffer = NULL;
*size = 0;
/* Open file */ /* Open file */
f = efi_file_from_path(file_path); f = efi_file_from_path(file_path);
if (!f) if (!f)
@ -1928,6 +1922,39 @@ error:
return ret; return ret;
} }
/**
* efi_load_image_from_path() - load an image using a file path
*
* Read a file into a buffer allocated as EFI_BOOT_SERVICES_DATA. It is the
* callers obligation to update the memory type as needed.
*
* @boot_policy: true for request originating from the boot manager
* @file_path: the path of the image to load
* @buffer: buffer containing the loaded image
* @size: size of the loaded image
* Return: status code
*/
static
efi_status_t efi_load_image_from_path(bool boot_policy,
struct efi_device_path *file_path,
void **buffer, efi_uintn_t *size)
{
efi_handle_t device;
efi_status_t ret;
struct efi_device_path *dp;
/* In case of failure nothing is returned */
*buffer = NULL;
*size = 0;
dp = file_path;
ret = EFI_CALL(efi_locate_device_path(
&efi_simple_file_system_protocol_guid, &dp, &device));
if (ret == EFI_SUCCESS)
return efi_load_image_from_file(file_path, buffer, size);
return EFI_NOT_FOUND;
}
/** /**
* efi_load_image() - load an EFI image into memory * efi_load_image() - load an EFI image into memory
* @boot_policy: true for request originating from the boot manager * @boot_policy: true for request originating from the boot manager