289 lines
7.5 KiB
C
289 lines
7.5 KiB
C
/*
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* Firmware Interface Table support.
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*
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* Copyright (C) 2012 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "common.h"
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#include "cbfs.h"
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#include "cbfs_image.h"
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#include "fit.h"
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/* FIXME: This code assumes it is being executed on a little endian machine. */
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#define FIT_POINTER_LOCATION 0xffffffc0
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#define FIT_TABLE_LOWEST_ADDRESS ((uint32_t)(-(16 << 20)))
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#define FIT_ENTRY_CHECKSUM_VALID 0x80
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#define FIT_TYPE_HEADER 0x0
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#define FIT_HEADER_VERSION 0x0100
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#define FIT_HEADER_ADDRESS "_FIT_ "
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#define FIT_TYPE_MICROCODE 0x1
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#define FIT_MICROCODE_VERSION 0x0100
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struct fit_entry {
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uint64_t address;
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uint32_t size_reserved;
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uint16_t version;
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uint8_t type_checksum_valid;
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uint8_t checksum;
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} __attribute__ ((packed));
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struct fit_table {
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struct fit_entry header;
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struct fit_entry entries[0];
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} __attribute__ ((packed));
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struct microcode_header {
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uint32_t version;
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uint32_t revision;
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uint32_t date;
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uint32_t processor_signature;
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uint32_t checksum;
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uint32_t loader_revision;
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uint32_t processor_flags;
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uint32_t data_size;
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uint32_t total_size;
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uint8_t reserved[12];
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} __attribute__ ((packed));
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struct microcode_entry {
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int offset;
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int size;
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};
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static inline void *rom_buffer_pointer(struct cbfs_image *image, int offset)
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{
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return &image->buffer.data[offset];
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}
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static inline int fit_entry_size_bytes(struct fit_entry *entry)
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{
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return (entry->size_reserved & 0xffffff) << 4;
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}
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static inline void fit_entry_update_size(struct fit_entry *entry,
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int size_bytes)
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{
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/* Size is multiples of 16 bytes. */
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entry->size_reserved = (size_bytes >> 4) & 0xffffff;
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}
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static inline void fit_entry_add_size(struct fit_entry *entry,
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int size_bytes)
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{
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int size = fit_entry_size_bytes(entry);
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size += size_bytes;
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fit_entry_update_size(entry, size);
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}
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static inline int fit_entry_type(struct fit_entry *entry)
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{
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return entry->type_checksum_valid & ~FIT_ENTRY_CHECKSUM_VALID;
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}
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/*
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* Get an offset from a host pointer. This function assumes the ROM is located
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* in the host address space at [4G - romsize -> 4G). It also assume all
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* pointers have values within this address range.
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*/
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static inline int ptr_to_offset(uint32_t theromsize, uint32_t host_ptr)
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{
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return (int)(theromsize + host_ptr);
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}
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/*
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* Get a pointer from an offset. This function assumes the ROM is located
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* in the host address space at [4G - romsize -> 4G). It also assume all
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* pointers have values within this address range.
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*/
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static inline uint32_t offset_to_ptr(uint32_t theromsize, int offset)
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{
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return -(theromsize - (uint32_t )offset);
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}
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static struct fit_table *locate_fit_table(struct cbfs_image *image)
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{
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struct fit_table *table;
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uint32_t *fit_pointer;
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fit_pointer = rom_buffer_pointer(image,
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ptr_to_offset(image->buffer.size, FIT_POINTER_LOCATION));
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/* Ensure pointer is below 4GiB and within 16MiB of 4GiB */
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if (fit_pointer[1] != 0 || fit_pointer[0] < FIT_TABLE_LOWEST_ADDRESS)
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return NULL;
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table = rom_buffer_pointer(image,
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ptr_to_offset(image->buffer.size, *fit_pointer));
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/* Check that the address field has the proper signature. */
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if (strncmp((const char *)&table->header.address, FIT_HEADER_ADDRESS,
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sizeof(table->header.address)))
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return NULL;
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if (table->header.version != FIT_HEADER_VERSION)
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return NULL;
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if (fit_entry_type(&table->header) != FIT_TYPE_HEADER)
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return NULL;
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/* Assume that the FIT table only contains the header */
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if (fit_entry_size_bytes(&table->header) != sizeof(struct fit_entry))
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return NULL;
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return table;
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}
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static void update_fit_checksum(struct fit_table *fit)
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{
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int size_bytes;
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uint8_t *buffer;
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uint8_t result;
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int i;
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fit->header.checksum = 0;
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size_bytes = fit_entry_size_bytes(&fit->header);
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result = 0;
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buffer = (void *)fit;
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for (i = 0; i < size_bytes; i++)
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result += buffer[i];
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fit->header.checksum = -result;
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}
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static void add_microcodde_entries(struct cbfs_image *image,
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struct fit_table *fit,
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struct microcode_entry *mcus, int num_mcus)
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{
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int i;
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for (i = 0; i < num_mcus; i++) {
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struct fit_entry *entry = &fit->entries[i];
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struct microcode_entry *mcu = &mcus[i];
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entry->address = offset_to_ptr(image->buffer.size, mcu->offset);
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fit_entry_update_size(entry, mcu->size);
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entry->version = FIT_MICROCODE_VERSION;
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entry->type_checksum_valid = FIT_TYPE_MICROCODE;
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entry->checksum = 0;
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fit_entry_add_size(&fit->header, sizeof(struct fit_entry));
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}
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}
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static int fit_header(void *ptr, uint32_t *current_offset, uint32_t *file_length)
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{
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struct buffer buf;
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struct cbfs_file header;
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buf.data = ptr;
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buf.size = sizeof(header);
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cbfs_file_get_header(&buf, &header);
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*current_offset = header.offset;
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*file_length = header.len;
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return 0;
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}
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static int parse_microcode_blob(struct cbfs_image *image,
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struct cbfs_file *mcode_file,
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struct microcode_entry *mcus, int *total_mcus)
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{
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int num_mcus;
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uint32_t current_offset;
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uint32_t file_length;
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current_offset = (int)((char *)mcode_file - image->buffer.data);
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fit_header(mcode_file, ¤t_offset, &file_length);
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num_mcus = 0;
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while (file_length > sizeof(struct microcode_header))
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{
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struct microcode_header *mcu_header;
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mcu_header = rom_buffer_pointer(image, current_offset);
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/* Quickly sanity check a prospective microcode update. */
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if (mcu_header->total_size < sizeof(*mcu_header))
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break;
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/* FIXME: Should the checksum be validated? */
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mcus[num_mcus].offset = current_offset;
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mcus[num_mcus].size = mcu_header->total_size;
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/* Proceed to next payload. */
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current_offset += mcus[num_mcus].size;
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file_length -= mcus[num_mcus].size;
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num_mcus++;
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/* Reached limit of FIT entries. */
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if (num_mcus == *total_mcus)
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break;
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if (file_length < sizeof(struct microcode_header))
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break;
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}
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/* Update how many microcode updates we found. */
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*total_mcus = num_mcus;
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return 0;
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}
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int fit_update_table(struct cbfs_image *image, int empty_entries,
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const char *microcode_blob_name)
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{
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struct fit_table *fit;
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struct cbfs_file *mcode_file;
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struct microcode_entry *mcus;
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int ret = 0;
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// struct rom_image image = { .rom = rom, .size = romsize, };
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fit = locate_fit_table(image);
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if (!fit) {
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ERROR("FIT not found.\n");
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return 1;
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}
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mcode_file = cbfs_get_entry(image, microcode_blob_name);
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if (!mcode_file) {
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ERROR("File '%s' not found in CBFS.\n",
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microcode_blob_name);
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return 1;
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}
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mcus = malloc(sizeof(*mcus) * empty_entries);
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if (!mcus) {
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ERROR("Couldn't allocate memory for microcode update entries.\n");
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return 1;
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}
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if (parse_microcode_blob(image, mcode_file, mcus, &empty_entries)) {
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ERROR("Couldn't parse microcode blob.\n");
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ret = 1;
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goto out;
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}
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add_microcodde_entries(image, fit, mcus, empty_entries);
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update_fit_checksum(fit);
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out:
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free(mcus);
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return ret;
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}
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