| /* Taken from depthcharge: src/boot/fit.c */ |
| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <assert.h> |
| #include <console/console.h> |
| #include <ctype.h> |
| #include <endian.h> |
| #include <identity.h> |
| #include <bootmem.h> |
| #include <string.h> |
| #include <program_loading.h> |
| #include <memrange.h> |
| #include <fit.h> |
| #include <boardid.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <types.h> |
| |
| static struct list_node image_nodes; |
| static struct list_node config_nodes; |
| static struct list_node compat_strings; |
| |
| struct compat_string_entry { |
| const char *compat_string; |
| struct list_node list_node; |
| }; |
| |
| /* Convert string to lowercase and replace '_' and spaces with '-'. */ |
| static char *clean_compat_string(char *str) |
| { |
| for (size_t i = 0; i < strlen(str); i++) { |
| str[i] = tolower(str[i]); |
| if (str[i] == '_' || str[i] == ' ') |
| str[i] = '-'; |
| } |
| |
| return str; |
| } |
| |
| static void fit_add_default_compat_strings(void) |
| { |
| char compat_string[80] = {}; |
| |
| if ((board_id() != UNDEFINED_STRAPPING_ID) && |
| (sku_id() != UNDEFINED_STRAPPING_ID)) { |
| snprintf(compat_string, sizeof(compat_string), |
| "%s,%s-rev%u-sku%u", mainboard_vendor, mainboard_part_number, |
| board_id(), sku_id()); |
| |
| fit_add_compat_string(compat_string); |
| } |
| |
| if (board_id() != UNDEFINED_STRAPPING_ID) { |
| snprintf(compat_string, sizeof(compat_string), "%s,%s-rev%u", |
| mainboard_vendor, mainboard_part_number, board_id()); |
| |
| fit_add_compat_string(compat_string); |
| } |
| |
| if (sku_id() != UNDEFINED_STRAPPING_ID) { |
| snprintf(compat_string, sizeof(compat_string), "%s,%s-sku%u", |
| mainboard_vendor, mainboard_part_number, sku_id()); |
| |
| fit_add_compat_string(compat_string); |
| } |
| |
| snprintf(compat_string, sizeof(compat_string), "%s,%s", |
| mainboard_vendor, mainboard_part_number); |
| |
| fit_add_compat_string(compat_string); |
| } |
| |
| static struct fit_image_node *find_image(const char *name) |
| { |
| struct fit_image_node *image; |
| list_for_each(image, image_nodes, list_node) { |
| if (!strcmp(image->name, name)) |
| return image; |
| } |
| printk(BIOS_ERR, "Cannot find image node %s!\n", name); |
| return NULL; |
| } |
| |
| static struct fit_image_node *find_image_with_overlays(const char *name, |
| int bytes, struct list_node *prev) |
| { |
| struct fit_image_node *base = find_image(name); |
| if (!base) |
| return NULL; |
| |
| int len = strnlen(name, bytes) + 1; |
| bytes -= len; |
| name += len; |
| while (bytes > 0) { |
| struct fit_overlay_chain *next = xzalloc(sizeof(*next)); |
| next->overlay = find_image(name); |
| if (!next->overlay) |
| return NULL; |
| list_insert_after(&next->list_node, prev); |
| prev = &next->list_node; |
| len = strnlen(name, bytes) + 1; |
| bytes -= len; |
| name += len; |
| } |
| |
| return base; |
| } |
| |
| static void image_node(struct device_tree_node *node) |
| { |
| struct fit_image_node *image = xzalloc(sizeof(*image)); |
| |
| image->compression = CBFS_COMPRESS_NONE; |
| image->name = node->name; |
| |
| struct device_tree_property *prop; |
| list_for_each(prop, node->properties, list_node) { |
| if (!strcmp("data", prop->prop.name)) { |
| image->data = prop->prop.data; |
| image->size = prop->prop.size; |
| } else if (!strcmp("compression", prop->prop.name)) { |
| if (!strcmp("none", prop->prop.data)) |
| image->compression = CBFS_COMPRESS_NONE; |
| else if (!strcmp("lzma", prop->prop.data)) |
| image->compression = CBFS_COMPRESS_LZMA; |
| else if (!strcmp("lz4", prop->prop.data)) |
| image->compression = CBFS_COMPRESS_LZ4; |
| else |
| image->compression = -1; |
| } |
| } |
| |
| list_insert_after(&image->list_node, &image_nodes); |
| } |
| |
| static void config_node(struct device_tree_node *node) |
| { |
| struct fit_config_node *config = xzalloc(sizeof(*config)); |
| config->name = node->name; |
| |
| struct device_tree_property *prop; |
| list_for_each(prop, node->properties, list_node) { |
| if (!strcmp("kernel", prop->prop.name)) |
| config->kernel = find_image(prop->prop.data); |
| else if (!strcmp("fdt", prop->prop.name)) |
| config->fdt = find_image_with_overlays(prop->prop.data, |
| prop->prop.size, &config->overlays); |
| else if (!strcmp("ramdisk", prop->prop.name)) |
| config->ramdisk = find_image(prop->prop.data); |
| else if (!strcmp("compatible", prop->prop.name)) |
| config->compat = prop->prop; |
| } |
| |
| list_insert_after(&config->list_node, &config_nodes); |
| } |
| |
| static void fit_unpack(struct device_tree *tree, const char **default_config) |
| { |
| struct device_tree_node *child; |
| struct device_tree_node *images = dt_find_node_by_path(tree, "/images", |
| NULL, NULL, 0); |
| if (images) |
| list_for_each(child, images->children, list_node) |
| image_node(child); |
| |
| struct device_tree_node *configs = dt_find_node_by_path(tree, |
| "/configurations", NULL, NULL, 0); |
| if (configs) { |
| *default_config = dt_find_string_prop(configs, "default"); |
| list_for_each(child, configs->children, list_node) |
| config_node(child); |
| } |
| } |
| |
| static int fdt_find_compat(const void *blob, uint32_t start_offset, |
| struct fdt_property *prop) |
| { |
| int offset = start_offset; |
| int size; |
| |
| size = fdt_node_name(blob, offset, NULL); |
| if (!size) |
| return -1; |
| offset += size; |
| |
| while ((size = fdt_next_property(blob, offset, prop))) { |
| if (!strcmp("compatible", prop->name)) |
| return 0; |
| |
| offset += size; |
| } |
| |
| prop->name = NULL; |
| return -1; |
| } |
| |
| static int fit_check_compat(struct fdt_property *compat_prop, |
| const char *compat_name) |
| { |
| int bytes = compat_prop->size; |
| const char *compat_str = compat_prop->data; |
| |
| for (int pos = 0; bytes && compat_str[0]; pos++) { |
| if (!strncmp(compat_str, compat_name, bytes)) |
| return pos; |
| int len = strlen(compat_str) + 1; |
| compat_str += len; |
| bytes -= len; |
| } |
| return -1; |
| } |
| |
| void fit_update_chosen(struct device_tree *tree, const char *cmd_line) |
| { |
| const char *path[] = { "chosen", NULL }; |
| struct device_tree_node *node; |
| node = dt_find_node(tree->root, path, NULL, NULL, 1); |
| |
| dt_add_string_prop(node, "bootargs", cmd_line); |
| } |
| |
| void fit_add_ramdisk(struct device_tree *tree, void *ramdisk_addr, |
| size_t ramdisk_size) |
| { |
| const char *path[] = { "chosen", NULL }; |
| struct device_tree_node *node; |
| node = dt_find_node(tree->root, path, NULL, NULL, 1); |
| |
| u64 start = (uintptr_t)ramdisk_addr; |
| u64 end = start + ramdisk_size; |
| |
| dt_add_u64_prop(node, "linux,initrd-start", start); |
| dt_add_u64_prop(node, "linux,initrd-end", end); |
| } |
| |
| static void update_reserve_map(uint64_t start, uint64_t end, |
| struct device_tree *tree) |
| { |
| struct device_tree_reserve_map_entry *entry = xzalloc(sizeof(*entry)); |
| |
| entry->start = start; |
| entry->size = end - start; |
| |
| list_insert_after(&entry->list_node, &tree->reserve_map); |
| } |
| |
| struct entry_params { |
| unsigned int addr_cells; |
| unsigned int size_cells; |
| void *data; |
| }; |
| |
| static uint64_t max_range(unsigned int size_cells) |
| { |
| /* |
| * Split up ranges who's sizes are too large to fit in #size-cells. |
| * The largest value we can store isn't a power of two, so we'll round |
| * down to make the math easier. |
| */ |
| return 0x1ULL << (size_cells * 32 - 1); |
| } |
| |
| static void update_mem_property(u64 start, u64 end, struct entry_params *params) |
| { |
| u8 *data = (u8 *)params->data; |
| u64 full_size = end - start; |
| while (full_size) { |
| const u64 max_size = max_range(params->size_cells); |
| const u64 size = MIN(max_size, full_size); |
| |
| dt_write_int(data, start, params->addr_cells * sizeof(u32)); |
| data += params->addr_cells * sizeof(uint32_t); |
| start += size; |
| |
| dt_write_int(data, size, params->size_cells * sizeof(u32)); |
| data += params->size_cells * sizeof(uint32_t); |
| full_size -= size; |
| } |
| params->data = data; |
| } |
| |
| struct mem_map { |
| struct memranges mem; |
| struct memranges reserved; |
| }; |
| |
| static bool walk_memory_table(const struct range_entry *r, void *arg) |
| { |
| struct mem_map *arg_map = arg; |
| struct memranges *ranges; |
| enum bootmem_type tag; |
| |
| ranges = range_entry_tag(r) == BM_MEM_RAM ? &arg_map->mem : &arg_map->reserved; |
| tag = range_entry_tag(r) == BM_MEM_RAM ? BM_MEM_RAM : BM_MEM_RESERVED; |
| memranges_insert(ranges, range_entry_base(r), range_entry_size(r), tag); |
| return true; |
| } |
| |
| void fit_add_compat_string(const char *str) |
| { |
| struct compat_string_entry *compat_node; |
| |
| compat_node = xzalloc(sizeof(*compat_node)); |
| compat_node->compat_string = strdup(str); |
| |
| clean_compat_string((char *)compat_node->compat_string); |
| |
| list_insert_after(&compat_node->list_node, &compat_strings); |
| } |
| |
| void fit_update_memory(struct device_tree *tree) |
| { |
| const struct range_entry *r; |
| struct device_tree_node *node; |
| u32 addr_cells = 1, size_cells = 1; |
| struct mem_map map; |
| |
| printk(BIOS_INFO, "FIT: Updating devicetree memory entries\n"); |
| |
| dt_read_cell_props(tree->root, &addr_cells, &size_cells); |
| |
| /* |
| * First remove all existing device_type="memory" nodes, then add ours. |
| */ |
| list_for_each(node, tree->root->children, list_node) { |
| const char *devtype = dt_find_string_prop(node, "device_type"); |
| if (devtype && !strcmp(devtype, "memory")) |
| list_remove(&node->list_node); |
| } |
| |
| node = xzalloc(sizeof(*node)); |
| |
| node->name = "memory"; |
| list_insert_after(&node->list_node, &tree->root->children); |
| dt_add_string_prop(node, "device_type", (char *)"memory"); |
| |
| memranges_init_empty(&map.mem, NULL, 0); |
| memranges_init_empty(&map.reserved, NULL, 0); |
| |
| bootmem_walk_os_mem(walk_memory_table, &map); |
| |
| /* CBMEM regions are both carved out and explicitly reserved. */ |
| memranges_each_entry(r, &map.reserved) { |
| update_reserve_map(range_entry_base(r), range_entry_end(r), |
| tree); |
| } |
| |
| /* |
| * Count the amount of 'reg' entries we need (account for size limits). |
| */ |
| size_t count = 0; |
| memranges_each_entry(r, &map.mem) { |
| uint64_t size = range_entry_size(r); |
| uint64_t max_size = max_range(size_cells); |
| count += DIV_ROUND_UP(size, max_size); |
| } |
| |
| /* Allocate the right amount of space and fill up the entries. */ |
| size_t length = count * (addr_cells + size_cells) * sizeof(u32); |
| |
| void *data = xzalloc(length); |
| |
| struct entry_params add_params = { addr_cells, size_cells, data }; |
| memranges_each_entry(r, &map.mem) { |
| update_mem_property(range_entry_base(r), range_entry_end(r), |
| &add_params); |
| } |
| assert(add_params.data - data == length); |
| |
| /* Assemble the final property and add it to the device tree. */ |
| dt_add_bin_prop(node, "reg", data, length); |
| |
| memranges_teardown(&map.mem); |
| memranges_teardown(&map.reserved); |
| } |
| |
| /* |
| * Finds a compat string and updates the compat position and rank. |
| * @param config The current config node to operate on |
| * @return 0 if compat updated, -1 if this FDT cannot be used. |
| */ |
| static int fit_update_compat(struct fit_config_node *config) |
| { |
| /* If there was no "compatible" property in config node, this is a |
| legacy FIT image. Must extract compat prop from FDT itself. */ |
| if (!config->compat.name) { |
| void *fdt_blob = config->fdt->data; |
| const struct fdt_header *fdt_header = fdt_blob; |
| uint32_t fdt_offset = be32_to_cpu(fdt_header->structure_offset); |
| |
| if (config->fdt->compression != CBFS_COMPRESS_NONE) { |
| printk(BIOS_ERR, "config %s has a compressed FDT without " |
| "external compatible property, skipping.\n", |
| config->name); |
| return -1; |
| } |
| |
| /* FDT overlays are not supported in legacy FIT images. */ |
| if (config->overlays.next) { |
| printk(BIOS_ERR, "config %s has overlay but no compat!\n", |
| config->name); |
| return -1; |
| } |
| |
| if (fdt_find_compat(fdt_blob, fdt_offset, &config->compat)) { |
| printk(BIOS_ERR, "Can't find compat string in FDT %s " |
| "for config %s, skipping.\n", |
| config->fdt->name, config->name); |
| return -1; |
| } |
| } |
| |
| config->compat_pos = -1; |
| config->compat_rank = -1; |
| size_t i = 0; |
| struct compat_string_entry *compat_node; |
| list_for_each(compat_node, compat_strings, list_node) { |
| int pos = fit_check_compat(&config->compat, |
| compat_node->compat_string); |
| if (pos >= 0) { |
| config->compat_pos = pos; |
| config->compat_rank = i; |
| config->compat_string = |
| compat_node->compat_string; |
| } |
| i++; |
| } |
| |
| return 0; |
| } |
| |
| struct fit_config_node *fit_load(void *fit) |
| { |
| struct fit_image_node *image; |
| struct fit_config_node *config; |
| struct compat_string_entry *compat_node; |
| struct fit_overlay_chain *overlay_chain; |
| |
| printk(BIOS_DEBUG, "FIT: Loading FIT from %p\n", fit); |
| |
| struct device_tree *tree = fdt_unflatten(fit); |
| if (!tree) { |
| printk(BIOS_ERR, "Failed to unflatten FIT image!\n"); |
| return NULL; |
| } |
| |
| const char *default_config_name = NULL; |
| struct fit_config_node *default_config = NULL; |
| struct fit_config_node *compat_config = NULL; |
| |
| fit_unpack(tree, &default_config_name); |
| |
| /* List the images we found. */ |
| list_for_each(image, image_nodes, list_node) |
| printk(BIOS_DEBUG, "FIT: Image %s has %d bytes.\n", image->name, |
| image->size); |
| |
| fit_add_default_compat_strings(); |
| |
| printk(BIOS_DEBUG, "FIT: Compat preference " |
| "(lowest to highest priority) :"); |
| |
| list_for_each(compat_node, compat_strings, list_node) { |
| printk(BIOS_DEBUG, " %s", compat_node->compat_string); |
| } |
| printk(BIOS_DEBUG, "\n"); |
| /* Process and list the configs. */ |
| list_for_each(config, config_nodes, list_node) { |
| if (!config->kernel) { |
| printk(BIOS_ERR, "config %s has no kernel, skipping.\n", |
| config->name); |
| continue; |
| } |
| if (!config->fdt) { |
| printk(BIOS_ERR, "config %s has no FDT, skipping.\n", |
| config->name); |
| continue; |
| } |
| |
| if (config->ramdisk && |
| config->ramdisk->compression < 0) { |
| printk(BIOS_WARNING, "Ramdisk is compressed with " |
| "an unsupported algorithm, discarding config %s." |
| "\n", config->name); |
| continue; |
| } |
| |
| if (fit_update_compat(config)) |
| continue; |
| |
| printk(BIOS_DEBUG, "FIT: config %s", config->name); |
| if (default_config_name && |
| !strcmp(config->name, default_config_name)) { |
| printk(BIOS_DEBUG, " (default)"); |
| default_config = config; |
| } |
| printk(BIOS_DEBUG, ", kernel %s", config->kernel->name); |
| printk(BIOS_DEBUG, ", fdt %s", config->fdt->name); |
| list_for_each(overlay_chain, config->overlays, list_node) |
| printk(BIOS_DEBUG, " %s", overlay_chain->overlay->name); |
| if (config->ramdisk) |
| printk(BIOS_DEBUG, ", ramdisk %s", |
| config->ramdisk->name); |
| if (config->compat.name) { |
| printk(BIOS_DEBUG, ", compat"); |
| int bytes = config->compat.size; |
| const char *compat_str = config->compat.data; |
| for (int pos = 0; bytes && compat_str[0]; pos++) { |
| printk(BIOS_DEBUG, " %s", compat_str); |
| if (pos == config->compat_pos) |
| printk(BIOS_DEBUG, " (match)"); |
| int len = strlen(compat_str) + 1; |
| compat_str += len; |
| bytes -= len; |
| } |
| |
| if (config->compat_rank >= 0 && (!compat_config || |
| config->compat_rank > compat_config->compat_rank)) |
| compat_config = config; |
| } |
| printk(BIOS_DEBUG, "\n"); |
| } |
| |
| struct fit_config_node *to_boot = NULL; |
| if (compat_config) { |
| to_boot = compat_config; |
| printk(BIOS_INFO, "FIT: Choosing best match %s for compat " |
| "%s.\n", to_boot->name, to_boot->compat_string); |
| } else if (default_config) { |
| to_boot = default_config; |
| printk(BIOS_INFO, "FIT: No match, choosing default %s.\n", |
| to_boot->name); |
| } else { |
| printk(BIOS_ERR, "FIT: No compatible or default configs. " |
| "Giving up.\n"); |
| return NULL; |
| } |
| |
| return to_boot; |
| } |