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bootmeth_efi_mgr.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Bootmethod for EFI boot manager
*
* Copyright 2021 Google LLC
* Written by Simon Glass <[email protected]>
*/
#define LOG_CATEGORY UCLASS_BOOTSTD
#include <bootdev.h>
#include <bootflow.h>
#include <bootmeth.h>
#include <command.h>
#include <dm.h>
#include <efi_loader.h>
#include <efi_variable.h>
#include <malloc.h>
/**
* struct efi_mgr_priv - private info for the efi-mgr driver
*
* @fake_bootflow: Fake a valid bootflow for testing
*/
struct efi_mgr_priv {
bool fake_dev;
};
void sandbox_set_fake_efi_mgr_dev(struct udevice *dev, bool fake_dev)
{
struct efi_mgr_priv *priv = dev_get_priv(dev);
priv->fake_dev = fake_dev;
}
static int efi_mgr_check(struct udevice *dev, struct bootflow_iter *iter)
{
int ret;
/* Must be an bootstd device */
ret = bootflow_iter_check_system(iter);
if (ret)
return log_msg_ret("net", ret);
return 0;
}
static int efi_mgr_read_bootflow(struct udevice *dev, struct bootflow *bflow)
{
struct efi_mgr_priv *priv = dev_get_priv(dev);
efi_status_t ret;
efi_uintn_t size;
u16 *bootorder;
if (priv->fake_dev) {
bflow->state = BOOTFLOWST_READY;
return 0;
}
ret = efi_init_obj_list();
if (ret)
return log_msg_ret("init", ret);
/* Enable this method if the "BootOrder" UEFI exists. */
bootorder = efi_get_var(u"BootOrder", &efi_global_variable_guid,
&size);
if (bootorder) {
free(bootorder);
bflow->state = BOOTFLOWST_READY;
return 0;
}
return -EINVAL;
}
static int efi_mgr_read_file(struct udevice *dev, struct bootflow *bflow,
const char *file_path, ulong addr,
enum bootflow_img_t type, ulong *sizep)
{
/* Files are loaded by the 'bootefi bootmgr' command */
return -ENOSYS;
}
static int efi_mgr_boot(struct udevice *dev, struct bootflow *bflow)
{
int ret;
/* Booting is handled by the 'bootefi bootmgr' command */
ret = efi_bootmgr_run(EFI_FDT_USE_INTERNAL);
return 0;
}
static int bootmeth_efi_mgr_bind(struct udevice *dev)
{
struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
plat->desc = "EFI bootmgr flow";
plat->flags = BOOTMETHF_GLOBAL;
return 0;
}
static struct bootmeth_ops efi_mgr_bootmeth_ops = {
.check = efi_mgr_check,
.read_bootflow = efi_mgr_read_bootflow,
.read_file = efi_mgr_read_file,
.boot = efi_mgr_boot,
};
static const struct udevice_id efi_mgr_bootmeth_ids[] = {
{ .compatible = "u-boot,efi-bootmgr" },
{ }
};
U_BOOT_DRIVER(bootmeth_3efi_mgr) = {
.name = "bootmeth_efi_mgr",
.id = UCLASS_BOOTMETH,
.of_match = efi_mgr_bootmeth_ids,
.ops = &efi_mgr_bootmeth_ops,
.bind = bootmeth_efi_mgr_bind,
.priv_auto = sizeof(struct efi_mgr_priv),
};