mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 19:10:13 +00:00
2984d21a28
The implementation in distro_efi_try_bootflow_files() does not pass a valid size to bootmeth_common_read_file(), so this can fail if the uninted value happens to be too small. Fix this. This was reported by someone but I cannot now find the email. Signed-off-by: Simon Glass <sjg@chromium.org>
483 lines
12 KiB
C
483 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Bootmethod for distro boot via EFI
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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 <common.h>
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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 <fs.h>
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#include <malloc.h>
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#include <mapmem.h>
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#include <mmc.h>
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#include <net.h>
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#include <pxe_utils.h>
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#include <linux/sizes.h>
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#define EFI_DIRNAME "efi/boot/"
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/**
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* get_efi_leafname() - Get the leaf name for the EFI file we expect
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*
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* @str: Place to put leaf name for this architecture, e.g. "bootaa64.efi".
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* Must have at least 16 bytes of space
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* @max_len: Length of @str, must be >=16
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*/
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static int get_efi_leafname(char *str, int max_len)
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{
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const char *base;
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if (max_len < 16)
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return log_msg_ret("spc", -ENOSPC);
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if (IS_ENABLED(CONFIG_ARM64))
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base = "bootaa64";
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else if (IS_ENABLED(CONFIG_ARM))
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base = "bootarm";
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else if (IS_ENABLED(CONFIG_X86_RUN_32BIT))
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base = "bootia32";
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else if (IS_ENABLED(CONFIG_X86_RUN_64BIT))
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base = "bootx64";
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else if (IS_ENABLED(CONFIG_ARCH_RV32I))
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base = "bootriscv32";
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else if (IS_ENABLED(CONFIG_ARCH_RV64I))
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base = "bootriscv64";
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else if (IS_ENABLED(CONFIG_SANDBOX))
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base = "bootsbox";
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else
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return -EINVAL;
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strcpy(str, base);
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strcat(str, ".efi");
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return 0;
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}
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static int get_efi_pxe_arch(void)
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{
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/* http://www.iana.org/assignments/dhcpv6-parameters/dhcpv6-parameters.xml */
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if (IS_ENABLED(CONFIG_ARM64))
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return 0xb;
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else if (IS_ENABLED(CONFIG_ARM))
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return 0xa;
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else if (IS_ENABLED(CONFIG_X86_64))
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return 0x6;
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else if (IS_ENABLED(CONFIG_X86))
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return 0x7;
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else if (IS_ENABLED(CONFIG_ARCH_RV32I))
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return 0x19;
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else if (IS_ENABLED(CONFIG_ARCH_RV64I))
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return 0x1b;
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else if (IS_ENABLED(CONFIG_SANDBOX))
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return 0; /* not used */
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return -EINVAL;
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}
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static int get_efi_pxe_vci(char *str, int max_len)
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{
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int ret;
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ret = get_efi_pxe_arch();
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if (ret < 0)
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return ret;
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snprintf(str, max_len, "PXEClient:Arch:%05x:UNDI:003000", ret);
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return 0;
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}
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/**
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* bootmeth_uses_network() - check if the media device is Ethernet
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*
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* @bflow: Bootflow to check
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* Returns: true if the media device is Ethernet, else false
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*/
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static bool bootmeth_uses_network(struct bootflow *bflow)
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{
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const struct udevice *media = dev_get_parent(bflow->dev);
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return IS_ENABLED(CONFIG_CMD_DHCP) &&
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device_get_uclass_id(media) == UCLASS_ETH;
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}
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static void set_efi_bootdev(struct blk_desc *desc, struct bootflow *bflow)
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{
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const struct udevice *media_dev;
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int size = bflow->size;
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const char *dev_name;
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char devnum_str[9];
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char dirname[200];
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char *last_slash;
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/*
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* This is a horrible hack to tell EFI about this boot device. Once we
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* unify EFI with the rest of U-Boot we can clean this up. The same hack
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* exists in multiple places, e.g. in the fs, tftp and load commands.
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*
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* Once we can clean up the EFI code to make proper use of driver model,
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* this can go away.
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*/
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media_dev = dev_get_parent(bflow->dev);
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snprintf(devnum_str, sizeof(devnum_str), "%x:%x",
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desc ? desc->devnum : dev_seq(media_dev),
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bflow->part);
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strlcpy(dirname, bflow->fname, sizeof(dirname));
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last_slash = strrchr(dirname, '/');
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if (last_slash)
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*last_slash = '\0';
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log_debug("setting bootdev %s, %s, %s, %p, %x\n",
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dev_get_uclass_name(media_dev), devnum_str, bflow->fname,
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bflow->buf, size);
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dev_name = device_get_uclass_id(media_dev) == UCLASS_MASS_STORAGE ?
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"usb" : dev_get_uclass_name(media_dev);
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efi_set_bootdev(dev_name, devnum_str, bflow->fname, bflow->buf, size);
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}
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static int efiload_read_file(struct bootflow *bflow, ulong addr)
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{
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struct blk_desc *desc = NULL;
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loff_t bytes_read;
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int ret;
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if (bflow->blk)
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desc = dev_get_uclass_plat(bflow->blk);
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ret = bootmeth_setup_fs(bflow, desc);
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if (ret)
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return log_msg_ret("set", ret);
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ret = fs_read(bflow->fname, addr, 0, bflow->size, &bytes_read);
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if (ret)
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return log_msg_ret("read", ret);
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bflow->buf = map_sysmem(addr, bflow->size);
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set_efi_bootdev(desc, bflow);
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return 0;
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}
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static int distro_efi_check(struct udevice *dev, struct bootflow_iter *iter)
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{
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/* This only works on block and network devices */
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if (bootflow_iter_check_blk(iter) && bootflow_iter_check_net(iter))
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return log_msg_ret("blk", -ENOTSUPP);
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/* This works on block devices and network devices */
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if (iter->method_flags & BOOTFLOW_METHF_PXE_ONLY)
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return log_msg_ret("pxe", -ENOTSUPP);
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return 0;
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}
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/**
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* distro_efi_get_fdt_name() - Get the filename for reading the .dtb file
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*
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* @fname: Place to put filename
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* @size: Max size of filename
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* @seq: Sequence number, to cycle through options (0=first)
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* Returns: 0 on success, -ENOENT if the "fdtfile" env var does not exist,
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* -EINVAL if there are no more options, -EALREADY if the control FDT should be
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* used
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*/
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static int distro_efi_get_fdt_name(char *fname, int size, int seq)
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{
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const char *fdt_fname;
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const char *prefix;
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/* select the prefix */
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switch (seq) {
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case 0:
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/* this is the default */
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prefix = "/dtb";
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break;
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case 1:
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prefix = "";
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break;
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case 2:
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prefix = "/dtb/current";
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break;
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default:
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return log_msg_ret("pref", -EINVAL);
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}
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fdt_fname = env_get("fdtfile");
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if (fdt_fname) {
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snprintf(fname, size, "%s/%s", prefix, fdt_fname);
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log_debug("Using device tree: %s\n", fname);
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} else if (IS_ENABLED(CONFIG_OF_HAS_PRIOR_STAGE)) {
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strcpy(fname, "<prior>");
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return log_msg_ret("pref", -EALREADY);
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/* Use this fallback only for 32-bit ARM */
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} else if (IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_ARM64)) {
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const char *soc = env_get("soc");
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const char *board = env_get("board");
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const char *boardver = env_get("boardver");
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/* cf the code in label_boot() which seems very complex */
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snprintf(fname, size, "%s/%s%s%s%s.dtb", prefix,
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soc ? soc : "", soc ? "-" : "", board ? board : "",
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boardver ? boardver : "");
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log_debug("Using default device tree: %s\n", fname);
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} else {
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return log_msg_ret("env", -ENOENT);
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}
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return 0;
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}
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/*
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* distro_efi_try_bootflow_files() - Check that files are present
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*
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* This reads any FDT file and checks whether the bootflow file is present, for
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* later reading. We avoid reading the bootflow now, since it is likely large,
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* it may take a long time and we want to avoid needing to allocate memory for
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* it
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*
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* @dev: bootmeth device to use
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* @bflow: bootflow to update
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*/
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static int distro_efi_try_bootflow_files(struct udevice *dev,
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struct bootflow *bflow)
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{
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struct blk_desc *desc = NULL;
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ulong fdt_addr, size;
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char fname[256];
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int ret, seq;
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/* We require a partition table */
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if (!bflow->part)
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return -ENOENT;
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strcpy(fname, EFI_DIRNAME);
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ret = get_efi_leafname(fname + strlen(fname),
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sizeof(fname) - strlen(fname));
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if (ret)
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return log_msg_ret("leaf", ret);
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if (bflow->blk)
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desc = dev_get_uclass_plat(bflow->blk);
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ret = bootmeth_try_file(bflow, desc, NULL, fname);
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if (ret)
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return log_msg_ret("try", ret);
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/* Since we can access the file, let's call it ready */
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bflow->state = BOOTFLOWST_READY;
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fdt_addr = env_get_hex("fdt_addr_r", 0);
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/* try the various available names */
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ret = -ENOENT;
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*fname = '\0';
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for (seq = 0; ret == -ENOENT; seq++) {
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ret = distro_efi_get_fdt_name(fname, sizeof(fname), seq);
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if (ret == -EALREADY)
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bflow->flags = BOOTFLOWF_USE_PRIOR_FDT;
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if (!ret) {
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/* Limit FDT files to 4MB */
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size = SZ_4M;
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ret = bootmeth_common_read_file(dev, bflow, fname,
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fdt_addr, &size);
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}
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}
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if (*fname) {
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bflow->fdt_fname = strdup(fname);
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if (!bflow->fdt_fname)
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return log_msg_ret("fil", -ENOMEM);
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}
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if (!ret) {
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bflow->fdt_size = size;
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bflow->fdt_addr = fdt_addr;
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/*
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* TODO: Apply extension overlay
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*
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* Here we need to load and apply the extension overlay. This is
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* not implemented. See do_extension_apply(). The extension
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* stuff needs an implementation in boot/extension.c so it is
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* separate from the command code. Really the extension stuff
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* should use the device tree and a uclass / driver interface
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* rather than implementing its own list
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*/
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} else {
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log_debug("No device tree available\n");
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}
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return 0;
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}
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static int distro_efi_read_bootflow_net(struct bootflow *bflow)
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{
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char file_addr[17], fname[256];
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char *tftp_argv[] = {"tftp", file_addr, fname, NULL};
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struct cmd_tbl cmdtp = {}; /* dummy */
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const char *addr_str, *fdt_addr_str;
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int ret, arch, size;
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ulong addr, fdt_addr;
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char str[36];
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ret = get_efi_pxe_vci(str, sizeof(str));
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if (ret)
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return log_msg_ret("vci", ret);
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ret = get_efi_pxe_arch();
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if (ret < 0)
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return log_msg_ret("arc", ret);
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arch = ret;
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ret = env_set("bootp_vci", str);
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if (ret)
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return log_msg_ret("vcs", ret);
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ret = env_set_ulong("bootp_arch", arch);
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if (ret)
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return log_msg_ret("ars", ret);
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/* figure out the load address */
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addr_str = env_get("kernel_addr_r");
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addr = addr_str ? hextoul(addr_str, NULL) : image_load_addr;
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/* clear any previous bootfile */
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env_set("bootfile", NULL);
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/* read the kernel */
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ret = dhcp_run(addr, NULL, true);
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if (ret)
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return log_msg_ret("dhc", ret);
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size = env_get_hex("filesize", -1);
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if (size <= 0)
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return log_msg_ret("sz", -EINVAL);
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bflow->size = size;
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/* do the hideous EFI hack */
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efi_set_bootdev("Net", "", bflow->fname, map_sysmem(addr, 0),
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bflow->size);
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/* read the DT file also */
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fdt_addr_str = env_get("fdt_addr_r");
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if (!fdt_addr_str)
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return log_msg_ret("fdt", -EINVAL);
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fdt_addr = hextoul(fdt_addr_str, NULL);
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sprintf(file_addr, "%lx", fdt_addr);
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/* We only allow the first prefix with PXE */
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ret = distro_efi_get_fdt_name(fname, sizeof(fname), 0);
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if (ret)
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return log_msg_ret("nam", ret);
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bflow->fdt_fname = strdup(fname);
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if (!bflow->fdt_fname)
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return log_msg_ret("fil", -ENOMEM);
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if (!do_tftpb(&cmdtp, 0, 3, tftp_argv)) {
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bflow->fdt_size = env_get_hex("filesize", 0);
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bflow->fdt_addr = fdt_addr;
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} else {
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log_debug("No device tree available\n");
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}
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bflow->state = BOOTFLOWST_READY;
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return 0;
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}
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static int distro_efi_read_bootflow(struct udevice *dev, struct bootflow *bflow)
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{
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int ret;
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if (bootmeth_uses_network(bflow)) {
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/* we only support reading from one device, so ignore 'dev' */
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ret = distro_efi_read_bootflow_net(bflow);
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if (ret)
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return log_msg_ret("net", ret);
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} else {
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ret = distro_efi_try_bootflow_files(dev, bflow);
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if (ret)
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return log_msg_ret("blk", ret);
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}
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return 0;
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}
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int distro_efi_boot(struct udevice *dev, struct bootflow *bflow)
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{
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ulong kernel, fdt;
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char cmd[50];
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int ret;
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kernel = env_get_hex("kernel_addr_r", 0);
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if (!bootmeth_uses_network(bflow)) {
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ret = efiload_read_file(bflow, kernel);
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if (ret)
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return log_msg_ret("read", ret);
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/*
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* use the provided device tree if available, else fall back to
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* the control FDT
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*/
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if (bflow->fdt_fname)
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fdt = bflow->fdt_addr;
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else
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fdt = (ulong)map_to_sysmem(gd->fdt_blob);
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} else {
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/*
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* This doesn't actually work for network devices:
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*
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* do_bootefi_image() No UEFI binary known at 0x02080000
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*
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* But this is the same behaviour for distro boot, so it can be
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* fixed here.
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*/
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fdt = env_get_hex("fdt_addr_r", 0);
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}
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/*
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* At some point we can add a real interface to bootefi so we can call
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* this directly. For now, go through the CLI, like distro boot.
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*/
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snprintf(cmd, sizeof(cmd), "bootefi %lx %lx", kernel, fdt);
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if (run_command(cmd, 0))
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return log_msg_ret("run", -EINVAL);
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return 0;
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}
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static int distro_bootmeth_efi_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 = IS_ENABLED(CONFIG_BOOTSTD_FULL) ?
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"EFI boot from an .efi file" : "EFI";
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return 0;
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}
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static struct bootmeth_ops distro_efi_bootmeth_ops = {
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.check = distro_efi_check,
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.read_bootflow = distro_efi_read_bootflow,
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.read_file = bootmeth_common_read_file,
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.boot = distro_efi_boot,
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};
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static const struct udevice_id distro_efi_bootmeth_ids[] = {
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{ .compatible = "u-boot,distro-efi" },
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{ }
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};
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U_BOOT_DRIVER(bootmeth_efi) = {
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.name = "bootmeth_efi",
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.id = UCLASS_BOOTMETH,
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.of_match = distro_efi_bootmeth_ids,
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.ops = &distro_efi_bootmeth_ops,
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.bind = distro_bootmeth_efi_bind,
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};
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