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https://source.denx.de/u-boot/u-boot.git
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6a56d10fdc
At present the EFI bootmgr scans all devices in the system before deciding which one to boot. Ideally it would use the bootstd iterator for this, but in the meantime, give it a lower priority, so it runs just before the network devices. Note that if there are no hunted network devices hunted, then it will run at the end, after all bootdevs are exhausted. In other words, it will always run. Signed-off-by: Simon Glass <sjg@chromium.org>
134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Bootmethod for EFI boot manager
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*
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* Copyright 2021 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#define LOG_CATEGORY UCLASS_BOOTSTD
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#include <bootdev.h>
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#include <bootflow.h>
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#include <bootmeth.h>
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#include <command.h>
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#include <dm.h>
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#include <efi_loader.h>
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#include <efi_variable.h>
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#include <malloc.h>
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/**
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* struct efi_mgr_priv - private info for the efi-mgr driver
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*
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* @fake_bootflow: Fake a valid bootflow for testing
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*/
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struct efi_mgr_priv {
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bool fake_dev;
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};
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void sandbox_set_fake_efi_mgr_dev(struct udevice *dev, bool fake_dev)
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{
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struct efi_mgr_priv *priv = dev_get_priv(dev);
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priv->fake_dev = fake_dev;
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}
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static int efi_mgr_check(struct udevice *dev, struct bootflow_iter *iter)
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{
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int ret;
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/* Must be an bootstd device */
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ret = bootflow_iter_check_system(iter);
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if (ret)
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return log_msg_ret("net", ret);
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return 0;
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}
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static int efi_mgr_read_bootflow(struct udevice *dev, struct bootflow *bflow)
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{
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struct efi_mgr_priv *priv = dev_get_priv(dev);
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efi_status_t ret;
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efi_uintn_t size;
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u16 *bootorder;
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if (priv->fake_dev) {
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bflow->state = BOOTFLOWST_READY;
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return 0;
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}
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ret = efi_init_obj_list();
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if (ret)
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return log_msg_ret("init", ret);
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/* Enable this method if the "BootOrder" UEFI exists. */
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bootorder = efi_get_var(u"BootOrder", &efi_global_variable_guid,
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&size);
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if (bootorder) {
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free(bootorder);
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bflow->state = BOOTFLOWST_READY;
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return 0;
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}
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return -EINVAL;
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}
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static int efi_mgr_read_file(struct udevice *dev, struct bootflow *bflow,
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const char *file_path, ulong addr,
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enum bootflow_img_t type, ulong *sizep)
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{
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/* Files are loaded by the 'bootefi bootmgr' command */
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return -ENOSYS;
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}
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static int efi_mgr_boot(struct udevice *dev, struct bootflow *bflow)
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{
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int ret;
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/* Booting is handled by the 'bootefi bootmgr' command */
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ret = efi_bootmgr_run(EFI_FDT_USE_INTERNAL);
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return 0;
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}
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static int bootmeth_efi_mgr_bind(struct udevice *dev)
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{
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struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
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plat->desc = "EFI bootmgr flow";
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plat->flags = BOOTMETHF_GLOBAL;
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/*
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* bootmgr scans all available devices which can take a while,
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* especially for network devices. So choose the priority so that it
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* comes just before the 'very slow' devices. This allows systems which
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* don't rely on bootmgr to boot quickly, while allowing bootmgr to run
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* on systems which need it.
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*/
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plat->glob_prio = BOOTDEVP_6_NET_BASE;
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return 0;
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}
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static struct bootmeth_ops efi_mgr_bootmeth_ops = {
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.check = efi_mgr_check,
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.read_bootflow = efi_mgr_read_bootflow,
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.read_file = efi_mgr_read_file,
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.boot = efi_mgr_boot,
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};
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static const struct udevice_id efi_mgr_bootmeth_ids[] = {
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{ .compatible = "u-boot,efi-bootmgr" },
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{ }
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};
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U_BOOT_DRIVER(bootmeth_3efi_mgr) = {
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.name = "bootmeth_efi_mgr",
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.id = UCLASS_BOOTMETH,
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.of_match = efi_mgr_bootmeth_ids,
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.ops = &efi_mgr_bootmeth_ops,
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.bind = bootmeth_efi_mgr_bind,
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.priv_auto = sizeof(struct efi_mgr_priv),
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};
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