blob: 225b19001a1532e522f59951f544f5d5a217dac8 [file] [log] [blame]
/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <libpayload.h>
#include <arch/endian.h>
#define ROM_RESET_VECTOR 0xFFFFFFF0
static void * next_header(void * cur)
{
struct lar_header *header = (struct lar_header *) cur;
int offset = ((ntohl(header->offset) + ntohl(header->len)) + 15) &
0xFFFFFFF0;
return (void *) (cur + offset);
}
static struct lar_header *lar_get_header(struct LAR *lar, int index)
{
int i;
if (index < lar->count)
return (struct lar_header *) lar->headers[index];
if (lar->eof && index >= lar->eof)
return NULL;
for(i = lar->count; i <= index; i++) {
void *next = (i == 0) ?
lar->start : next_header(lar->headers[i - 1]);
if (strncmp((const char *) next, LAR_MAGIC, 8)) {
lar->eof = lar->count;
return NULL;
}
if (lar->count == lar->alloc) {
void *tmp = realloc(lar->headers,
(lar->alloc + 16) * sizeof(void *));
if (tmp == NULL)
return NULL;
lar->headers = tmp;
lar->alloc += 16;
}
lar->headers[lar->count++] = next;
}
return (struct lar_header *) lar->headers[index];
}
/**
* Open a LAR stream
*
* @param addr The address in memory where the LAR is located.
* Use NULL to specify the boot LAR
* @return a pointer to the LAR stream
*/
struct LAR *openlar(void *addr)
{
struct LAR *lar;
/* If the address is null, then figure out the start of the
boot LAR */
if (addr == NULL) {
u32 size = *((u32 *) (ROM_RESET_VECTOR + 4));
addr = (void *) ((ROM_RESET_VECTOR + 16) - size);
}
/* Check the magic to make sure this is a LAR */
if (strncmp((const char *) addr, LAR_MAGIC, strlen(LAR_MAGIC)))
return NULL;
lar = calloc(sizeof(struct LAR), 1);
if (!lar)
return NULL;
lar->start = addr;
/* Preallocate 16 slots in the cache - this saves wear and
* tear on the heap */
lar->headers = malloc(16 * sizeof(void *));
lar->alloc = 16;
lar->count = lar->eof = 0;
lar->cindex = 0;
return lar;
}
/**
* Close a LAR stream
*
* @param lar A pointer to the LAR stream
* @return Return 0 on success, -1 on error
*/
int closelar(struct LAR *lar)
{
if (!lar)
return 0;
if (lar->headers)
free(lar->headers);
free(lar);
return 0;
}
/**
* Read an entry from the LAR
*
* @param lar A pointer to the LAR stream
* @return A pointer to a larent structure
representing the next file in the LAR
*/
struct larent *readlar(struct LAR *lar)
{
static struct larent _larent;
struct lar_header *header;
int nlen;
if (!lar)
return NULL;
header = lar_get_header(lar, lar->cindex);
if (header == NULL)
return NULL;
nlen = ntohl(header->offset) - sizeof(*header);
if (nlen > LAR_MAX_PATHLEN - 1)
nlen = LAR_MAX_PATHLEN - 1;
memcpy((void *) _larent.name, ((char *) header + sizeof(*header)),
nlen);
_larent.name[nlen] = 0;
lar->cindex++;
return (struct larent *) &_larent;
}
void rewindlar(struct LAR *lar)
{
if (lar != NULL)
lar->cindex = 0;
}
static struct lar_header *get_header_by_name(struct LAR *lar, const char *name)
{
struct lar_header *header;
int i;
for(i = 0; ; i++) {
header = lar_get_header(lar, i);
if (header == NULL)
return NULL;
if (!strcmp(name, ((char *) header + sizeof(*header))))
return header;
}
}
int larstat(struct LAR *lar, const char *path, struct larstat *buf)
{
struct lar_header *header = get_header_by_name(lar, path);
if (header == NULL || buf == NULL)
return -1;
buf->len = ntohl(header->len);
buf->reallen = ntohl(header->reallen);
buf->checksum = ntohl(header->checksum);
buf->compchecksum = ntohl(header->compchecksum);
buf->compression = ntohl(header->compression);
buf->entry = ntohll(header->entry);
buf->loadaddress = ntohll(header->loadaddress);
buf->offset = ((u32) header - (u32) lar->start) + ntohl(header->offset);
return 0;
}
void * larfptr(struct LAR *lar, const char *filename)
{
struct lar_header *header = get_header_by_name(lar, filename);
if (header == NULL)
return NULL;
return (void *) ((u8 *) header + ntohl(header->offset));
}
/**
* Verify the checksum on a particular LAR entry
*
* @param lar A pointer to the LAR stream
* @param filename The lar entry to verify
* @return Return 1 if the entry is valid, 0 if it is not, or -1
* on error
*/
int lfverify(struct LAR *lar, const char *filename)
{
struct lar_header *header = get_header_by_name(lar, filename);
u8 *ptr = (u8 *) header;
int len = ntohl(header->len) + ntohl(header->offset);
int offset;
u32 csum = 0;
if (header == NULL)
return -1;
/* The checksum needs to be calulated on entire data section,
* including any padding for the 16 byte alignment (which should
* be zeros
*/
len = (len + 15) & 0xFFFFFFF0;
for(offset = 0; offset < len; offset += 4) {
csum += *((u32 *) (ptr + offset));
}
return (csum == 0xFFFFFFFF) ? 1 : 0;
}
struct LFILE * lfopen(struct LAR *lar, const char *filename)
{
struct LFILE *file;
struct lar_header *header = get_header_by_name(lar, filename);
if (header == NULL)
return NULL;
/* FIXME: What other validations do we want to do on the file here? */
file = malloc(sizeof(struct LFILE));
if (file == NULL)
return NULL;
file->lar = lar;
file->header = header;
file->size = ntohl(header->len);
file->start = ((u8 *) header + ntohl(header->offset));
file->offset = 0;
return file;
}
void *lfmap(struct LFILE *file, int offset)
{
if (file == NULL)
return (void *) -1;
if (offset > file->size)
return (void *) -1;
return (void *) (file->start + offset);
};
int lfread(void *ptr, size_t size, size_t nmemb, struct LFILE *stream)
{
size_t tsize, actual;
size_t remain = stream->size - stream->offset;
if (!stream || !remain)
return 0;
tsize = (size * nmemb);
actual = (tsize > remain) ? remain : tsize;
memcpy(ptr, (void *) (stream->start + stream->offset), actual);
stream->offset += actual;
return actual;
}
int lfseek(struct LFILE *file, long offset, int whence)
{
int o = file->offset;
switch(whence) {
case SEEK_SET:
o = offset;
break;
case SEEK_CUR:
o += offset;
break;
case SEEK_END:
return -1;
}
if (o < 0 || o > file->size)
return -1;
file->offset = o;
return file->offset;
}
int lfclose(struct LFILE *file)
{
if (file)
free(file);
return 0;
}