| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <boot/coreboot_tables.h> |
| #include <device/mmio.h> |
| #include <cbfs.h> |
| #include <cf9_reset.h> |
| #include <commonlib/bsd/compression.h> |
| #include <commonlib/fsp.h> |
| #include <console/console.h> |
| #include <fsp/util.h> |
| #include <string.h> |
| #include <types.h> |
| #include <assert.h> |
| |
| static uint32_t fsp_hdr_get_expected_min_length(void) |
| { |
| if (CONFIG(PLATFORM_USES_FSP2_3)) |
| return 80; |
| else if (CONFIG(PLATFORM_USES_FSP2_2)) |
| return 76; |
| else if (CONFIG(PLATFORM_USES_FSP2_1)) |
| return 72; |
| else if (CONFIG(PLATFORM_USES_FSP2_0)) |
| return 72; |
| else |
| return dead_code_t(uint32_t); |
| } |
| |
| static bool looks_like_fsp_header(struct fsp_header *hdr) |
| { |
| if (memcmp(&hdr->signature, FSP_HDR_SIGNATURE, 4)) { |
| printk(BIOS_ALERT, "Did not find a valid FSP signature\n"); |
| return false; |
| } |
| |
| /* It is possible to build FSP with any version of edk2 which could have introduced new |
| fields in FSP_INFO_HEADER. The new fields will be ignored based on the reported FSP |
| version. This check ensures that the reported header length is at least what the |
| reported FSP version requires so that we do not access any out-of-bound bytes. */ |
| if (hdr->header_length < fsp_hdr_get_expected_min_length()) { |
| printk(BIOS_ALERT, "FSP header has invalid length: %d\n", hdr->header_length); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| enum cb_err fsp_identify(struct fsp_header *hdr, const void *fsp_blob) |
| { |
| memcpy(hdr, fsp_blob, sizeof(struct fsp_header)); |
| if (!looks_like_fsp_header(hdr)) |
| return CB_ERR; |
| |
| return CB_SUCCESS; |
| } |
| |
| enum cb_err fsp_validate_component(struct fsp_header *hdr, void *fsp_file, size_t file_size) |
| { |
| void *raw_hdr = fsp_file + FSP_HDR_OFFSET; |
| |
| if (file_size < FSP_HDR_OFFSET + fsp_hdr_get_expected_min_length()) { |
| printk(BIOS_CRIT, "FSP blob too small.\n"); |
| return CB_ERR; |
| } |
| |
| if (fsp_identify(hdr, raw_hdr) != CB_SUCCESS) { |
| printk(BIOS_CRIT, "No valid FSP header\n"); |
| return CB_ERR; |
| } |
| |
| if (CONFIG(DISPLAY_FSP_HEADER)) |
| fsp_print_header_info(hdr); |
| |
| /* Check if size specified in the header matches the cbfs file size */ |
| if (file_size < hdr->image_size) { |
| printk(BIOS_CRIT, "Component size bigger than cbfs file.\n"); |
| return CB_ERR; |
| } |
| |
| if (ENV_RAMINIT) |
| soc_validate_fspm_header(hdr); |
| |
| return CB_SUCCESS; |
| } |
| |
| static bool fsp_reset_requested(efi_return_status_t status) |
| { |
| return (status >= FSP_STATUS_RESET_REQUIRED_COLD && |
| status <= FSP_STATUS_RESET_REQUIRED_8); |
| } |
| |
| void fsp_handle_reset(efi_return_status_t status) |
| { |
| if (!fsp_reset_requested(status)) |
| return; |
| |
| fsp_printk(status, BIOS_SPEW, "FSP: handling reset type"); |
| |
| switch (status) { |
| case FSP_STATUS_RESET_REQUIRED_COLD: |
| full_reset(); |
| break; |
| case FSP_STATUS_RESET_REQUIRED_WARM: |
| system_reset(); |
| break; |
| case FSP_STATUS_RESET_REQUIRED_3: |
| case FSP_STATUS_RESET_REQUIRED_4: |
| case FSP_STATUS_RESET_REQUIRED_5: |
| case FSP_STATUS_RESET_REQUIRED_6: |
| case FSP_STATUS_RESET_REQUIRED_7: |
| case FSP_STATUS_RESET_REQUIRED_8: |
| chipset_handle_reset(status); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static inline bool fspm_env(void) |
| { |
| if (ENV_RAMINIT) |
| return true; |
| return false; |
| } |
| |
| static inline bool fspm_xip(void) |
| { |
| /* FSP-M is assumed to be loaded in romstage. */ |
| if (fspm_env() && CONFIG(FSP_M_XIP)) |
| return true; |
| return false; |
| } |
| |
| /* Load the FSP component described by fsp_load_descriptor from cbfs. The FSP |
| * header object will be validated and filled in on successful load. */ |
| enum cb_err fsp_load_component(struct fsp_load_descriptor *fspld, struct fsp_header *hdr) |
| { |
| size_t output_size; |
| void *dest; |
| struct prog *fsp_prog = &fspld->fsp_prog; |
| |
| dest = cbfs_alloc(prog_name(fsp_prog), fspld->alloc, fspld, &output_size); |
| if (!dest) |
| return CB_ERR; |
| |
| /* Don't allow FSP-M relocation when XIP. */ |
| if (!fspm_xip() && fsp_component_relocate((uintptr_t)dest, dest, output_size) < 0) { |
| printk(BIOS_ERR, "Unable to relocate FSP component!\n"); |
| return CB_ERR; |
| } |
| |
| prog_set_area(fsp_prog, dest, output_size); |
| |
| if (fsp_validate_component(hdr, dest, output_size) != CB_SUCCESS) { |
| printk(BIOS_ERR, "Invalid FSP header after load!\n"); |
| return CB_ERR; |
| } |
| |
| /* Signal that FSP component has been loaded. */ |
| prog_segment_loaded(hdr->image_base, hdr->image_size, SEG_FINAL); |
| |
| return CB_SUCCESS; |
| } |
| |
| /* Only call this function when FSP header has been read and validated */ |
| void fsp_get_version(char *buf) |
| { |
| struct fsp_header *hdr = &fsps_hdr; |
| union fsp_revision revision; |
| |
| revision.val = hdr->image_revision; |
| snprintf(buf, FSP_VER_LEN, "%u.%u-%u.%u.%u.%u", (hdr->spec_version >> 4), |
| hdr->spec_version & 0xf, revision.rev.major, |
| revision.rev.minor, revision.rev.revision, revision.rev.bld_num); |
| } |
| |
| /* Check if the signature in the UPD header matches the expected one. If it doesn't match, the |
| FSP binaries in CBFS are for a different platform than the platform code trying to use it |
| in which case the function calls die(). */ |
| void fsp_verify_upd_header_signature(uint64_t upd_signature, uint64_t expected_signature) |
| { |
| if (upd_signature != expected_signature) { |
| /* The UPD signatures are non-zero-terminated ASCII stored as a little endian |
| uint64_t, so this needs some casts. */ |
| die_with_post_code(POSTCODE_INVALID_VENDOR_BINARY, |
| "Invalid UPD signature! FSP provided \"%.8s\", expected was \"%.8s\".\n", |
| (char *)&upd_signature, |
| (char *)&expected_signature); |
| } |
| } |
| |
| /* Add FSP version to coreboot table LB_TAG_PLATFORM_BLOB_VERSION */ |
| void lb_string_platform_blob_version(struct lb_header *header) |
| { |
| struct lb_string *rec; |
| size_t len; |
| char fsp_version[FSP_VER_LEN] = {0}; |
| |
| fsp_get_version(fsp_version); |
| rec = (struct lb_string *)lb_new_record(header); |
| rec->tag = LB_TAG_PLATFORM_BLOB_VERSION; |
| len = strlen(fsp_version); |
| rec->size = ALIGN_UP(sizeof(*rec) + len + 1, 8); |
| memcpy(rec->string, fsp_version, len+1); |
| } |
| |
| __weak void soc_validate_fspm_header(const struct fsp_header *hdr) |
| { |
| } |