2 * This file is part of the coreboot project.
4 * Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
5 * Copyright (C) 2011 secunet Security Networks AG
6 * (Written by Patrick Georgi <patrick.georgi@secunet.com>)
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
22 #include <arpa/inet.h>
23 #include <sys/types.h>
32 #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
33 #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
35 static void *cbfs_mapped;
36 static u32 cbfs_offset;
37 static void* virt_to_phys(u32 virt)
39 return (void*)(virt+cbfs_offset);
43 #define debug(x...) printf(x)
45 #define debug(x...) while(0) {}
48 static int cbfs_check_magic(struct cbfs_file *file)
50 return !strcmp(file->magic, CBFS_FILE_MAGIC) ? 1 : 0;
53 static struct cbfs_header *cbfs_master_header(void)
55 struct cbfs_header *header;
57 void *ptr = virt_to_phys(*((u32*)virt_to_phys(CBFS_HEADPTR_ADDR)));
58 debug("Check CBFS header at %p\n", ptr);
59 header = (struct cbfs_header *) ptr;
61 debug("magic is %08x\n", ntohl(header->magic));
62 if (ntohl(header->magic) != CBFS_HEADER_MAGIC) {
63 printf("ERROR: No valid CBFS header found!\n");
67 debug("Found CBFS header at %p\n", ptr);
71 struct cbfs_file *cbfs_find(const char *name)
73 struct cbfs_header *header = cbfs_master_header();
78 offset = (u32)virt_to_phys(0 - ntohl(header->romsize) + ntohl(header->offset));
80 int align= ntohl(header->align);
83 struct cbfs_file *file = (struct cbfs_file *) offset;
84 if (!cbfs_check_magic(file)) return NULL;
85 debug("Check %s\n", CBFS_NAME(file));
86 if (!strcmp(CBFS_NAME(file), name))
89 int flen = ntohl(file->len);
90 int foffset = ntohl(file->offset);
91 debug("CBFS: follow chain: %p + %x + %x + align -> ", (void *)offset, foffset, flen);
93 unsigned long oldoffset = offset;
94 offset = ALIGN(offset + foffset + flen, align);
95 debug("%p\n", (void *)offset);
96 if (offset <= oldoffset) return NULL;
98 if (offset < (u32)virt_to_phys(0xFFFFFFFF - ntohl(header->romsize)))
103 void *cbfs_find_file(const char *name, unsigned int type, unsigned int *len)
105 struct cbfs_file *file = cbfs_find(name);
108 printf("CBFS: Could not find file %s\n",
113 if (ntohl(file->type) != type) {
114 printf("CBFS: File %s is of type %x instead of"
115 "type %x\n", name, file->type, type);
119 if (len != NULL) *len = file->len;
121 return (void *) CBFS_SUBHEADER(file);
124 void open_cbfs(const char *filename)
126 struct stat cbfs_stat;
129 cbfs_fd = open(filename, O_RDWR);
131 printf("Couldn't open '%s'\n", filename);
134 if (fstat(cbfs_fd, &cbfs_stat) == -1) {
135 printf("Couldn't stat '%s'\n", filename);
138 cbfs_mapped = mmap(NULL, cbfs_stat.st_size, PROT_READ | PROT_WRITE,
139 MAP_SHARED, cbfs_fd, 0);
140 if (cbfs_mapped == MAP_FAILED) {
141 printf("Couldn't map '%s'\n", filename);
144 cbfs_offset = (uint32_t)cbfs_mapped-(0xffffffff-cbfs_stat.st_size+1);