boot/bootmeth_efi_mgr.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Bootmethod for EFI boot manager
   4  *
   5  * Copyright 2021 Google LLC
   6  * Written by Simon Glass <sjg@chromium.org>
   7  */
   8
   9 #define LOG_CATEGORY UCLASS_BOOTSTD
  10
  11 #include <common.h>
  12 #include <bootdev.h>
  13 #include <bootflow.h>
  14 #include <bootmeth.h>
  15 #include <command.h>
  16 #include <dm.h>
  17 #include <efi_loader.h>
  18 #include <efi_variable.h>
  19 #include <malloc.h>
  20
  21 /**
  22  * struct efi_mgr_priv - private info for the efi-mgr driver
  23  *
  24  * @fake_bootflow: Fake a valid bootflow for testing
  25  */
  26 struct efi_mgr_priv {
  27         bool fake_dev;
  28 };
  29
  30 void sandbox_set_fake_efi_mgr_dev(struct udevice *dev, bool fake_dev)
  31 {
  32         struct efi_mgr_priv *priv = dev_get_priv(dev);
  33
  34         priv->fake_dev = fake_dev;
  35 }
  36
  37 static int efi_mgr_check(struct udevice *dev, struct bootflow_iter *iter)
  38 {
  39         int ret;
  40
  41         /* Must be an bootstd device */
  42         ret = bootflow_iter_check_system(iter);
  43         if (ret)
  44                 return log_msg_ret("net", ret);
  45
  46         return 0;
  47 }
  48
  49 static int efi_mgr_read_bootflow(struct udevice *dev, struct bootflow *bflow)
  50 {
  51         struct efi_mgr_priv *priv = dev_get_priv(dev);
  52         efi_status_t ret;
  53         efi_uintn_t size;
  54         u16 *bootorder;
  55
  56         if (priv->fake_dev) {
  57                 bflow->state = BOOTFLOWST_READY;
  58                 return 0;
  59         }
  60
  61         ret = efi_init_obj_list();
  62         if (ret)
  63                 return log_msg_ret("init", ret);
  64
  65         /* Enable this method if the "BootOrder" UEFI exists. */
  66         bootorder = efi_get_var(u"BootOrder", &efi_global_variable_guid,
  67                                 &size);
  68         if (bootorder) {
  69                 free(bootorder);
  70                 bflow->state = BOOTFLOWST_READY;
  71                 return 0;
  72         }
  73
  74         return -EINVAL;
  75 }
  76
  77 static int efi_mgr_read_file(struct udevice *dev, struct bootflow *bflow,
  78                                 const char *file_path, ulong addr, ulong *sizep)
  79 {
  80         /* Files are loaded by the 'bootefi bootmgr' command */
  81
  82         return -ENOSYS;
  83 }
  84
  85 static int efi_mgr_boot(struct udevice *dev, struct bootflow *bflow)
  86 {
  87         int ret;
  88
  89         /* Booting is handled by the 'bootefi bootmgr' command */
  90         ret = efi_bootmgr_run(EFI_FDT_USE_INTERNAL);
  91
  92         return 0;
  93 }
  94
  95 static int bootmeth_efi_mgr_bind(struct udevice *dev)
  96 {
  97         struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
  98
  99         plat->desc = "EFI bootmgr flow";
 100         plat->flags = BOOTMETHF_GLOBAL;
 101
 102         return 0;
 103 }
 104
 105 static struct bootmeth_ops efi_mgr_bootmeth_ops = {
 106         .check          = efi_mgr_check,
 107         .read_bootflow  = efi_mgr_read_bootflow,
 108         .read_file      = efi_mgr_read_file,
 109         .boot           = efi_mgr_boot,
 110 };
 111
 112 static const struct udevice_id efi_mgr_bootmeth_ids[] = {
 113         { .compatible = "u-boot,efi-bootmgr" },
 114         { }
 115 };
 116
 117 U_BOOT_DRIVER(bootmeth_efi_mgr) = {
 118         .name           = "bootmeth_efi_mgr",
 119         .id             = UCLASS_BOOTMETH,
 120         .of_match       = efi_mgr_bootmeth_ids,
 121         .ops            = &efi_mgr_bootmeth_ops,
 122         .bind           = bootmeth_efi_mgr_bind,
 123         .priv_auto      = sizeof(struct efi_mgr_priv),
 124 };