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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 | // SPDX-License-Identifier: GPL-2.0+ /* * Verified Boot for Embedded (VBE) 'simple' method * * Copyright 2022 Google LLC * Written by Simon Glass <sjg@chromium.org> */ #define LOG_CATEGORY LOGC_BOOT #include <bootdev.h> #include <bootflow.h> #include <bootmeth.h> #include <dm.h> #include <log.h> #include <memalign.h> #include <mmc.h> #include <vbe.h> #include <dm/device-internal.h> #include <dm/ofnode.h> #include "vbe_simple.h" static int simple_read_nvdata(const struct simple_priv *priv, struct udevice *blk, struct simple_state *state) { ALLOC_CACHE_ALIGN_BUFFER(u8, buf, MMC_MAX_BLOCK_LEN); const struct vbe_nvdata *nvd; int ret; ret = vbe_read_nvdata(blk, priv->area_start + priv->state_offset, priv->state_size, buf); if (ret) return log_msg_ret("nv", ret); nvd = (struct vbe_nvdata *)buf; state->fw_vernum = nvd->fw_vernum; log_debug("version=%s\n", state->fw_version); return 0; } int vbe_simple_read_state(struct udevice *dev, struct simple_state *state) { struct simple_priv *priv = dev_get_priv(dev); struct udevice *blk; int ret; ret = vbe_get_blk(priv->storage, &blk); if (ret) return log_msg_ret("blk", ret); ret = vbe_read_version(blk, priv->area_start + priv->version_offset, state->fw_version, MAX_VERSION_LEN); if (ret) return log_msg_ret("ver", ret); ret = simple_read_nvdata(priv, blk, state); if (ret) return log_msg_ret("nvd", ret); return 0; } static int vbe_simple_get_state_desc(struct udevice *dev, char *buf, int maxsize) { struct simple_state state; int ret; ret = vbe_simple_read_state(dev, &state); if (ret) return log_msg_ret("read", ret); if (maxsize < 30) return -ENOSPC; snprintf(buf, maxsize, "Version: %s\nVernum: %x/%x", state.fw_version, state.fw_vernum >> FWVER_KEY_SHIFT, state.fw_vernum & FWVER_FW_MASK); return 0; } static int vbe_simple_read_bootflow(struct udevice *dev, struct bootflow *bflow) { int ret; if (CONFIG_IS_ENABLED(BOOTMETH_VBE_SIMPLE_FW)) { if (vbe_phase() == VBE_PHASE_FIRMWARE) { ret = vbe_simple_read_bootflow_fw(dev, bflow); if (ret) return log_msg_ret("fw", ret); return 0; } } return -EINVAL; } static int vbe_simple_read_file(struct udevice *dev, struct bootflow *bflow, const char *file_path, ulong *addrp, ulong align, enum bootflow_img_t type, ulong *sizep) { int ret; if (vbe_phase() == VBE_PHASE_OS) { ret = bootmeth_common_read_file(dev, bflow, file_path, addrp, align, type, sizep); if (ret) return log_msg_ret("os", ret); } /* To be implemented */ return -EINVAL; } static struct bootmeth_ops bootmeth_vbe_simple_ops = { .get_state_desc = vbe_simple_get_state_desc, .read_bootflow = vbe_simple_read_bootflow, .read_file = vbe_simple_read_file, }; static int bootmeth_vbe_simple_probe(struct udevice *dev) { struct simple_priv *priv = dev_get_priv(dev); memset(priv, '\0', sizeof(*priv)); if (dev_read_u32(dev, "area-start", &priv->area_start) || dev_read_u32(dev, "area-size", &priv->area_size) || dev_read_u32(dev, "version-offset", &priv->version_offset) || dev_read_u32(dev, "version-size", &priv->version_size) || dev_read_u32(dev, "state-offset", &priv->state_offset) || dev_read_u32(dev, "state-size", &priv->state_size)) return log_msg_ret("read", -EINVAL); dev_read_u32(dev, "skip-offset", &priv->skip_offset); priv->storage = strdup(dev_read_string(dev, "storage")); if (!priv->storage) return log_msg_ret("str", -EINVAL); return 0; } static int bootmeth_vbe_simple_bind(struct udevice *dev) { struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev); plat->desc = IS_ENABLED(CONFIG_BOOTSTD_FULL) ? "VBE simple" : "vbe-simple"; plat->flags = BOOTMETHF_GLOBAL; return 0; } #if CONFIG_IS_ENABLED(OF_REAL) static const struct udevice_id generic_simple_vbe_simple_ids[] = { { .compatible = "fwupd,vbe-simple" }, { } }; #endif U_BOOT_DRIVER(vbe_simple) = { .name = "vbe_simple", .id = UCLASS_BOOTMETH, .of_match = of_match_ptr(generic_simple_vbe_simple_ids), .ops = &bootmeth_vbe_simple_ops, .bind = bootmeth_vbe_simple_bind, .probe = bootmeth_vbe_simple_probe, .flags = DM_FLAG_PRE_RELOC, .priv_auto = sizeof(struct simple_priv), }; |