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bootstd: Add an implementation of EFI bootmgr

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Add a bootmeth driver which handles EFI boot manager, using EFI_LOADER.

In effect, this provides the same functionality as the 'bootefi bootmgr'
command and shares the same code. But the interface into it is via a
bootmeth, so it does not require any special scripts, etc.

For now this requires the 'bootefi' command be enabled. Future work may
tidy this up so that it can be used without CONFIG_CMDLINE being enabled.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2022-04-24 23:31:19 -06:00 committed by Tom Rini
parent a080b98981
commit 0b41525e8f
2 changed files with 89 additions and 0 deletions
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3
boot/Makefile
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@ -27,6 +27,9 @@ obj-$(CONFIG_$(SPL_TPL_)BOOTSTD) += bootstd-uclass.o
obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_DISTRO) += bootmeth_distro.o
obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_DISTRO_PXE) += bootmeth_pxe.o
obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_EFILOADER) += bootmeth_efi.o
ifdef CONFIG_$(SPL_TPL_)BOOTSTD_FULL
obj-$(CONFIG_$(SPL_TPL_)CMD_BOOTEFI_BOOTMGR) += bootmeth_efi_mgr.o
endif
obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += image-fdt.o
obj-$(CONFIG_$(SPL_TPL_)FIT_SIGNATURE) += fdt_region.o

86
boot/bootmeth_efi_mgr.c Normal file
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@ -0,0 +1,86 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Bootmethod for EFI boot manager
*
* Copyright 2021 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEGORY UCLASS_BOOTSTD
#include <common.h>
#include <bootdev.h>
#include <bootflow.h>
#include <bootmeth.h>
#include <command.h>
#include <dm.h>
static int efi_mgr_check(struct udevice *dev, struct bootflow_iter *iter)
{
int ret;
/* Must be an bootstd device */
ret = bootflow_iter_uses_system(iter);
if (ret)
return log_msg_ret("net", ret);
return 0;
}
static int efi_mgr_read_bootflow(struct udevice *dev, struct bootflow *bflow)
{
/*
* Just assume there is something to boot since we don't have any way
* of knowing in advance
*/
bflow->state = BOOTFLOWST_READY;
return 0;
}
static int efi_mgr_read_file(struct udevice *dev, struct bootflow *bflow,
const char *file_path, ulong addr, 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 = run_command("bootefi bootmgr", 0);
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";
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_zefi_mgr) = {
.name = "bootmeth_efi_mgr",
.id = UCLASS_BOOTMETH,
.of_match = efi_mgr_bootmeth_ids,
.ops = &efi_mgr_bootmeth_ops,
.bind = bootmeth_efi_mgr_bind,
};