150 lines
3.7 KiB
C
150 lines
3.7 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
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* Copyright (C) 2011 secunet Security Networks AG
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* (Written by Patrick Georgi <patrick.georgi@secunet.com>)
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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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#ifdef __MINGW32__
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#include <winsock.h>
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#else
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#include <arpa/inet.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifndef __MINGW32__
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#include <sys/mman.h>
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#endif
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdio.h>
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#include "cbfs.h"
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#include "common.h"
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#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
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#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
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static void *cbfs_mapped;
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static void *cbfs_offset;
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static void* virt_to_phys(u32 virt)
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{
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return cbfs_offset + virt;
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}
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#ifdef DEBUG
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#define debug(x...) printf(x)
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#else
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#define debug(x...) while(0) {}
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#endif
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static int cbfs_check_magic(struct cbfs_file *file)
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{
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return !strcmp(file->magic, CBFS_FILE_MAGIC) ? 1 : 0;
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}
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static struct cbfs_header *cbfs_master_header(void)
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{
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struct cbfs_header *header;
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void *ptr = virt_to_phys(*((u32*)virt_to_phys(CBFS_HEADPTR_ADDR)));
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debug("Check CBFS header at %p\n", ptr);
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header = (struct cbfs_header *) ptr;
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debug("magic is %08x\n", ntohl(header->magic));
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if (ntohl(header->magic) != CBFS_HEADER_MAGIC) {
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printf("ERROR: No valid CBFS header found!\n");
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return NULL;
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}
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debug("Found CBFS header at %p\n", ptr);
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return header;
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}
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struct cbfs_file *cbfs_find(const char *name)
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{
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struct cbfs_header *header = cbfs_master_header();
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void *offset;
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if (header == NULL)
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return NULL;
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offset = virt_to_phys(0 - ntohl(header->romsize) + ntohl(header->offset));
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int align= ntohl(header->align);
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while(1) {
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struct cbfs_file *file = (struct cbfs_file *) offset;
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if (!cbfs_check_magic(file)) return NULL;
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debug("Check %s\n", CBFS_NAME(file));
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if (!strcmp(CBFS_NAME(file), name))
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return file;
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int flen = ntohl(file->len);
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int foffset = ntohl(file->offset);
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debug("CBFS: follow chain: %p + %x + %x + align -> ", offset, foffset, flen);
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void *oldoffset = offset;
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offset = (void*)ALIGN((uintptr_t)(offset + foffset + flen), align);
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debug("%p\n", (void *)offset);
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if (offset <= oldoffset) return NULL;
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if (offset < virt_to_phys(0xFFFFFFFF - ntohl(header->romsize)))
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return NULL;
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}
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}
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void *cbfs_find_file(const char *name, unsigned int type, unsigned int *len)
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{
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struct cbfs_file *file = cbfs_find(name);
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if (file == NULL) {
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printf("CBFS: Could not find file %s\n",
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name);
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return NULL;
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}
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if (ntohl(file->type) != type) {
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printf("CBFS: File %s is of type %x instead of"
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"type %x\n", name, file->type, type);
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return NULL;
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}
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if (len != NULL) *len = file->len;
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return (void *) CBFS_SUBHEADER(file);
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}
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void open_cbfs(const char *filename)
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{
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struct stat cbfs_stat;
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int cbfs_fd;
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cbfs_fd = open(filename, O_RDWR);
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if (cbfs_fd == -1) {
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printf("Couldn't open '%s'\n", filename);
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exit(-1);
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}
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if (fstat(cbfs_fd, &cbfs_stat) == -1) {
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printf("Couldn't stat '%s'\n", filename);
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exit(-1);
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}
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cbfs_mapped = mmap(NULL, cbfs_stat.st_size, PROT_READ | PROT_WRITE,
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MAP_SHARED, cbfs_fd, 0);
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close(cbfs_fd);
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if (cbfs_mapped == MAP_FAILED) {
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printf("Couldn't map '%s'\n", filename);
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exit(-1);
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}
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cbfs_offset = cbfs_mapped-(0xffffffff-cbfs_stat.st_size+1);
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}
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