src/lib/cbfs.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2008, Jordan Crouse <jordan@cosmicpenguin.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
  18  */
  19
  20 #include <types.h>
  21 #include <string.h>
  22 #include <console/console.h>
  23 #include <cbfs.h>
  24 #include <lib.h>
  25 #include <arch/byteorder.h>
  26
  27
  28 /**
  29  * Decompression wrapper for CBFS
  30  * @param algo
  31  * @param src
  32  * @param dst
  33  * @param len
  34  * @return 0 on success, -1 on failure
  35  */
  36 static int cbfs_decompress(int algo, void *src, void *dst, int len)
  37 {
  38         switch(algo) {
  39         case CBFS_COMPRESS_NONE:
  40                 memcpy(dst, src, len);
  41                 return 0;
  42
  43         case CBFS_COMPRESS_LZMA:
  44                 if (!ulzma(src, dst)) {
  45                         printk(BIOS_ERR, "CBFS: LZMA decompression failed!\n");
  46                         return -1;
  47                 }
  48                 return 0;
  49
  50         default:
  51                 printk(BIOS_INFO,  "CBFS:  Unknown compression type %d\n", algo);
  52                 return -1;
  53         }
  54 }
  55
  56 static int cbfs_check_magic(struct cbfs_file *file)
  57 {
  58         return !strcmp(file->magic, CBFS_FILE_MAGIC) ? 1 : 0;
  59 }
  60
  61 static struct cbfs_header *cbfs_master_header(void)
  62 {
  63         struct cbfs_header *header;
  64
  65         void *ptr = (void *)*((unsigned long *) CBFS_HEADPTR_ADDR);
  66         printk(BIOS_SPEW, "Check CBFS header at %p\n", ptr);
  67         header = (struct cbfs_header *) ptr;
  68
  69         printk(BIOS_SPEW, "magic is %08x\n", ntohl(header->magic));
  70         if (ntohl(header->magic) != CBFS_HEADER_MAGIC) {
  71                 printk(BIOS_ERR, "ERROR: No valid CBFS header found!\n");
  72                 if (header->magic == 0xffffffff) {
  73                         printk(BIOS_ERR, "Maybe the ROM isn't entirely mapped yet?\n"
  74                                 "See (and report to) http://www.coreboot.org/Infrastructure_Projects#CBFS\n");
  75                 }
  76                 return NULL;
  77         }
  78
  79         printk(BIOS_SPEW, "Found CBFS header at %p\n", ptr);
  80         return header;
  81 }
  82
  83 struct cbfs_file *cbfs_find(const char *name)
  84 {
  85         struct cbfs_header *header = cbfs_master_header();
  86         unsigned long offset;
  87
  88         if (header == NULL)
  89                 return NULL;
  90         offset = 0 - ntohl(header->romsize) + ntohl(header->offset);
  91
  92         int align= ntohl(header->align);
  93
  94         while(1) {
  95                 struct cbfs_file *file = (struct cbfs_file *) offset;
  96                 if (!cbfs_check_magic(file)) return NULL;
  97                 printk(BIOS_SPEW, "Check %s\n", CBFS_NAME(file));
  98                 if (!strcmp(CBFS_NAME(file), name))
  99                         return file;
 100
 101                 int flen = ntohl(file->len);
 102                 int foffset = ntohl(file->offset);
 103                 printk(BIOS_SPEW, "CBFS: follow chain: %p + %x + %x + align -> ", (void *)offset, foffset, flen);
 104
 105                 unsigned long oldoffset = offset;
 106                 offset = ALIGN(offset + foffset + flen, align);
 107                 printk(BIOS_SPEW, "%p\n", (void *)offset);
 108                 if (offset <= oldoffset) return NULL;
 109
 110                 if (offset < 0xFFFFFFFF - ntohl(header->romsize))
 111                         return NULL;
 112         }
 113 }
 114
 115 void *cbfs_find_file(const char *name, int type)
 116 {
 117         struct cbfs_file *file = cbfs_find(name);
 118
 119         if (file == NULL) {
 120                 printk(BIOS_INFO,  "CBFS:  Could not find file %s\n",
 121                        name);
 122                 return NULL;
 123         }
 124
 125         if (ntohl(file->type) != type) {
 126                 printk(BIOS_INFO,  "CBFS:  File %s is of type %x instead of"
 127                        "type %x\n", name, file->type, type);
 128
 129                 return NULL;
 130         }
 131
 132         return (void *) CBFS_SUBHEADER(file);
 133 }
 134
 135 static inline int tohex4(unsigned int c)
 136 {
 137         return (c<=9)?(c+'0'):(c-10+'a');
 138 }
 139
 140 static void tohex16(unsigned int val, char* dest)
 141 {
 142         dest[0]=tohex4(val>>12);
 143         dest[1]=tohex4((val>>8) & 0xf);
 144         dest[2]=tohex4((val>>4) & 0xf);
 145         dest[3]=tohex4(val & 0xf);
 146 }
 147
 148 void *cbfs_load_optionrom(u16 vendor, u16 device, void * dest)
 149 {
 150         char name[17]="pciXXXX,XXXX.rom";
 151         struct cbfs_optionrom *orom;
 152         u8 *src;
 153
 154         tohex16(vendor, name+3);
 155         tohex16(device, name+8);
 156
 157         orom = (struct cbfs_optionrom *)
 158                 cbfs_find_file(name, CBFS_TYPE_OPTIONROM);
 159
 160         if (orom == NULL)
 161                 return NULL;
 162
 163         /* They might have specified a dest address. If so, we can decompress.
 164          * If not, there's not much hope of decompressing or relocating the rom.
 165          * in the common case, the expansion rom is uncompressed, we
 166          * pass 0 in for the dest, and all we have to do is find the rom and
 167          * return a pointer to it.
 168          */
 169
 170         /* BUG: the cbfstool is (not yet) including a cbfs_optionrom header */
 171         src = ((unsigned char *) orom); // + sizeof(struct cbfs_optionrom);
 172
 173         if (! dest)
 174                 return src;
 175
 176         if (cbfs_decompress(ntohl(orom->compression),
 177                              src,
 178                              dest,
 179                              ntohl(orom->len)))
 180                 return NULL;
 181
 182         return dest;
 183 }
 184
 185 void * cbfs_load_stage(const char *name)
 186 {
 187         struct cbfs_stage *stage = (struct cbfs_stage *)
 188                 cbfs_find_file(name, CBFS_TYPE_STAGE);
 189         /* this is a mess. There is no ntohll. */
 190         /* for now, assume compatible byte order until we solve this. */
 191         u32 entry;
 192
 193         if (stage == NULL)
 194                 return (void *) -1;
 195
 196         printk(BIOS_INFO, "Stage: loading %s @ 0x%x (%d bytes), entry @ 0x%llx\n",
 197                         name,
 198                         (u32) stage->load, stage->memlen,
 199                         stage->entry);
 200         memset((void *) (u32) stage->load, 0, stage->memlen);
 201
 202         if (cbfs_decompress(stage->compression,
 203                              ((unsigned char *) stage) +
 204                              sizeof(struct cbfs_stage),
 205                              (void *) (u32) stage->load,
 206                              stage->len))
 207                 return (void *) -1;
 208
 209         printk(BIOS_DEBUG, "Stage: done loading.\n");
 210
 211         entry = stage->entry;
 212         // entry = ntohl((u32) stage->entry);
 213
 214         return (void *) entry;
 215 }
 216
 217 int cbfs_execute_stage(const char *name)
 218 {
 219         struct cbfs_stage *stage = (struct cbfs_stage *)
 220                 cbfs_find_file(name, CBFS_TYPE_STAGE);
 221
 222         if (stage == NULL)
 223                 return 1;
 224
 225         if (ntohl(stage->compression) != CBFS_COMPRESS_NONE) {
 226                 printk(BIOS_INFO,  "CBFS:  Unable to run %s:  Compressed file"
 227                        "Not supported for in-place execution\n", name);
 228                 return 1;
 229         }
 230
 231         /* FIXME: This isn't right */
 232         printk(BIOS_INFO,  "CBFS: run @ %p\n", (void *) ntohl((u32) stage->entry));
 233         return run_address((void *) ntohl((u32) stage->entry));
 234 }
 235
 236 /**
 237  * run_address is passed the address of a function taking no parameters and
 238  * jumps to it, returning the result.
 239  * @param f the address to call as a function.
 240  * @return value returned by the function.
 241  */
 242
 243 int run_address(void *f)
 244 {
 245         int (*v) (void);
 246         v = f;
 247         return v();
 248 }
 249