diff options
Diffstat (limited to 'util/amdfwtool/amdfwread.c')
| -rw-r--r-- | util/amdfwtool/amdfwread.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/util/amdfwtool/amdfwread.c b/util/amdfwtool/amdfwread.c new file mode 100644 index 000000000000..1a95c5c2677a --- /dev/null +++ b/util/amdfwtool/amdfwread.c @@ -0,0 +1,237 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#include <getopt.h> +#include <stddef.h> +#include <stdio.h> +#include <stdint.h> +#include <stdlib.h> +#include <unistd.h> +#include "amdfwtool.h" + +/* An address can be relative to the image/file start but it can also be the address when + * the image is mapped at 0xff000000. Used to ensure that we only attempt to read within + * the limits of the file. */ +#define FILE_REL_MASK 0xffffff + +#define ERR(...) fprintf(stderr, __VA_ARGS__) + +/* Possible locations for the header */ +const uint32_t fw_header_offsets[] = { + 0xfa0000, + 0xe20000, + 0xc20000, + 0x820000, + 0x020000, +}; + +/* Converts addresses to be relative to the start of the file */ +static uint64_t relative_offset(const psp_directory_header *header, uint32_t header_offset, + const psp_directory_entry *entry, size_t entry_index) +{ + amd_addr_mode mode = header->additional_info_fields.address_mode; + if (mode == AMD_ADDR_REL_BIOS) { + /* Entry address mode override directory mode with this value */ + mode = entry->address_mode; + } + + switch (mode) { + case AMD_ADDR_REL_BIOS: + return entry->addr + header_offset; + + case AMD_ADDR_REL_SLOT: + return entry->addr + header_offset + sizeof(psp_directory_header) + + entry_index * sizeof(psp_directory_entry); + + default: + break; + } + + return entry->addr & FILE_REL_MASK; +} + +static int read_fw_header(FILE *fw, uint32_t offset, embedded_firmware *fw_header) +{ + if (fseek(fw, offset, SEEK_SET) != 0) { + ERR("Failed to seek to fw header offset 0x%x\n", offset); + return 1; + } + + if (fread(fw_header, sizeof(embedded_firmware), 1, fw) != 1) { + ERR("Failed to read fw header at 0x%x\n", offset); + return 1; + } + + return fw_header->signature != EMBEDDED_FW_SIGNATURE; +} + +static int read_psp_directory(FILE *fw, uint32_t offset, uint32_t expected_cookie, + psp_directory_header *header, psp_directory_entry **entries, + size_t *num_entries) +{ + offset &= FILE_REL_MASK; + + if (fseek(fw, offset, SEEK_SET) != 0) { + ERR("Failed to seek to PSP header at 0x%x\n", offset); + return 1; + } + + if (fread(header, sizeof(psp_directory_header), 1, fw) != 1) { + ERR("Failed to read PSP header cookie\n"); + return 1; + } + + /* Ensure that we have a PSP directory */ + if (header->cookie != expected_cookie) { + ERR("Invalid PSP header cookie value found: 0x%x, expected: 0x%x\n", + expected_cookie, header->cookie); + return 1; + } + + /* Read the entries */ + *num_entries = header->num_entries; + *entries = malloc(sizeof(psp_directory_entry) * header->num_entries); + if (fread(*entries, sizeof(psp_directory_entry), header->num_entries, fw) + != header->num_entries) { + ERR("Failed to read %d PSP entries\n", header->num_entries); + return 1; + } + + return 0; +} + +static int read_soft_fuse(FILE *fw, const embedded_firmware *fw_header) +{ + psp_directory_entry *current_entries = NULL; + size_t num_current_entries = 0; + + uint32_t psp_offset = 0; + /* 0xffffffff indicates that the offset is in new_psp_directory */ + if (fw_header->psp_directory != 0xffffffff) + psp_offset = fw_header->psp_directory; + else + psp_offset = fw_header->new_psp_directory; + + psp_directory_header header; + if (read_psp_directory(fw, psp_offset, PSP_COOKIE, &header, + ¤t_entries, &num_current_entries) != 0) + return 1; + + while (1) { + uint32_t l2_dir_offset = 0; + + for (size_t i = 0; i < num_current_entries; i++) { + uint32_t type = current_entries[i].type; + if (type == AMD_PSP_FUSE_CHAIN) { + uint64_t mode = current_entries[i].address_mode; + uint64_t addr = current_entries[i].addr; + uint64_t fuse = mode << 62 | addr; + + printf("Soft-fuse:0x%lx\n", fuse); + return 0; + } else if (type == AMD_FW_L2_PTR) { + /* There's a second level PSP directory to read */ + if (l2_dir_offset != 0) + return 1; + + l2_dir_offset = relative_offset(&header, psp_offset, + ¤t_entries[i], i); + } + } + + free(current_entries); + + /* Didn't find an L2 PSP directory so we can stop */ + if (l2_dir_offset == 0) + break; + + /* Read the L2 PSP directory */ + if (read_psp_directory(fw, l2_dir_offset, PSPL2_COOKIE, &header, + ¤t_entries, &num_current_entries) != 0) + break; + } + + return 1; +} + +enum { + AMDFW_OPT_HELP = 'h', + + /* When bit 31 is set, options are a bitfield of info to print from the + firmware image. */ + AMDFW_OPT_SOFT_FUSE = 0xF0000001, +}; + +static char const optstring[] = {AMDFW_OPT_HELP}; + +static struct option long_options[] = { + {"help", no_argument, 0, AMDFW_OPT_HELP}, + {"soft-fuse", no_argument, 0, AMDFW_OPT_SOFT_FUSE}, +}; + +static void print_usage(void) +{ + printf("amdfwread: Examine AMD firmware images\n"); + printf("Usage: amdfwread [options] <file>\n"); + printf("--soft-fuse Print soft fuse value\n"); +} + +int main(int argc, char **argv) +{ + char *fw_file = NULL; + + int selected_functions = 0; + int index = 0; + while (1) { + int opt = getopt_long(argc, argv, optstring, long_options, &index); + + if (opt == -1) { + index++; + if (index >= argc) { + /* Print usage if we didn't get any arguments */ + print_usage(); + return 0; + } + + fw_file = argv[index]; + break; + } + + if (opt == AMDFW_OPT_HELP) { + print_usage(); + return 0; + } + + selected_functions |= opt; + } + + FILE *fw = fopen(fw_file, "rb"); + if (!fw) { + ERR("Failed to open FW file %s\n", fw_file); + return 1; + } + + /* Find the FW header by checking each possible location */ + embedded_firmware fw_header; + int found_header = 0; + for (size_t i = 0; i < ARRAY_SIZE(fw_header_offsets); i++) { + if (read_fw_header(fw, fw_header_offsets[i], &fw_header) == 0) { + found_header = 1; + break; + } + } + + if (!found_header) { + ERR("Failed to find FW header\n"); + fclose(fw); + return 1; + } + + if (selected_functions & AMDFW_OPT_SOFT_FUSE) { + if (read_soft_fuse(fw, &fw_header) != 0) { + fclose(fw); + return 1; + } + } + + fclose(fw); + return 0; +} |