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/* SPDX-License-Identifier: BSD-3-Clause */
#include <assert.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <libflashrom.h>
#include "uflashrom.h"
static int flashrom_print_cb(enum flashrom_log_level level, const char *fmt, va_list ap)
{
int ret = 0;
FILE *output_type = stderr;
if (level > FLASHROM_MSG_INFO)
return ret;
ret = vfprintf(output_type, fmt, ap);
/* msg_*spew often happens inside chip accessors
* in possibly time-critical operations.
* If increasing verbosity, don't slow them down by flushing.
*/
fflush(output_type);
return ret;
}
static size_t resize_buf_to_offset(uint8_t **buf, unsigned int start, unsigned int len)
{
uint8_t *old = *buf; // make a copy to free the old heap.
*buf = calloc(1, len);
memcpy(*buf, &old[start], len);
free(old);
return len;
}
static uint8_t *resize_buf_from_offset(const uint8_t *buf, size_t len, unsigned int rstart,
unsigned int rlen)
{
size_t nlen = rstart + rlen;
if (nlen > len)
return NULL;
uint8_t *nbuf = calloc(1, len); /* NOTE: full len buf required for writes. */
memcpy(nbuf + rstart, buf, rlen);
return nbuf;
}
/**
* @brief Reads from flash into a buffer with an optional region.
*
* @param image, containing the programmer to use, unallocated buffer and size.
* @param region, (optional) the string of the region to read from.
* @return 0 on success
*/
int flashrom_read(struct firmware_programmer *image, const char *region)
{
int r = 0;
size_t len = 0;
struct flashrom_programmer *prog = NULL;
struct flashrom_flashctx *flashctx = NULL;
struct flashrom_layout *layout = NULL;
flashrom_set_log_callback((flashrom_log_callback *)&flashrom_print_cb);
r |= flashrom_init(1);
r |= flashrom_programmer_init(&prog, image->programmer, NULL);
r |= flashrom_flash_probe(&flashctx, prog, NULL);
if (r) {
r = -1;
goto err_cleanup;
}
len = flashrom_flash_getsize(flashctx);
if (region) {
r = flashrom_layout_read_fmap_from_rom(&layout, flashctx, 0, len);
if (r > 0) {
fprintf(stderr, "could not read fmap from rom, r=%d\n", r);
r = -1;
goto err_cleanup;
}
/* empty region causes seg fault in API. */
r |= flashrom_layout_include_region(layout, region);
if (r > 0) {
fprintf(stderr, "could not include region = '%s'\n", region);
r = -1;
goto err_cleanup;
}
flashrom_layout_set(flashctx, layout);
}
/* Due to how the libflashrom API works we first need a buffer sized
* to the entire flash and after the read has finished, find the
* the precise region size then resize the buffer accordingly.
*/
image->data = calloc(1, len);
image->size = len;
r |= flashrom_image_read(flashctx, image->data, len);
/* Here we resize the buffer from being the entire flash down to the specific
* region size read and that we were interested in. Note that we only include
* a singular region.
*/
if (region) {
unsigned int r_start, r_len;
flashrom_layout_get_region_range(layout, region, &r_start, &r_len);
image->size = resize_buf_to_offset(&image->data, r_start, r_len);
}
err_cleanup:
flashrom_programmer_shutdown(prog);
if (layout)
flashrom_layout_release(layout);
if (flashctx)
flashrom_flash_release(flashctx);
return r;
}
/**
* @brief Writes flash from a buffer with an optional region.
*
* @param image, containing the programmer to use, allocated buffer and its size.
* @param region, (optional) the string of the region to write to.
* @return 0 on success
*/
int flashrom_write(struct firmware_programmer *image, const char *region)
{
int r = 0;
size_t len = 0;
uint8_t *buf = image->data;
struct flashrom_programmer *prog = NULL;
struct flashrom_flashctx *flashctx = NULL;
struct flashrom_layout *layout = NULL;
flashrom_set_log_callback((flashrom_log_callback *)&flashrom_print_cb);
r |= flashrom_init(1);
r |= flashrom_programmer_init(&prog, image->programmer, NULL);
r |= flashrom_flash_probe(&flashctx, prog, NULL);
if (r) {
r = -1;
goto err_cleanup;
}
len = flashrom_flash_getsize(flashctx);
if (len == 0) {
fprintf(stderr, "zero sized flash detected\n");
r = -1;
goto err_cleanup;
}
if (region) {
r = flashrom_layout_read_fmap_from_buffer(
&layout, flashctx, (const uint8_t *)image->data, image->size);
if (r > 0) {
r = flashrom_layout_read_fmap_from_rom(&layout, flashctx, 0, len);
if (r > 0) {
fprintf(stderr, "could not read fmap from image or rom, r=%d\n",
r);
r = -1;
goto err_cleanup;
}
}
/* empty region causes seg fault in API. */
r |= flashrom_layout_include_region(layout, region);
if (r > 0) {
fprintf(stderr, "could not include region = '%s'\n", region);
r = -1;
goto err_cleanup;
}
flashrom_layout_set(flashctx, layout);
unsigned int r_start, r_len;
flashrom_layout_get_region_range(layout, region, &r_start, &r_len);
assert(r_len == image->size);
buf = resize_buf_from_offset(image->data, len, r_start, r_len);
if (!buf) {
r = -1;
goto err_cleanup_free;
}
} else if (image->size != len) {
r = -1;
goto err_cleanup;
}
flashrom_flag_set(flashctx, FLASHROM_FLAG_VERIFY_WHOLE_CHIP, false);
flashrom_flag_set(flashctx, FLASHROM_FLAG_VERIFY_AFTER_WRITE, true);
r |= flashrom_image_write(flashctx, buf, len, NULL);
err_cleanup_free:
if (region)
free(buf);
err_cleanup:
flashrom_programmer_shutdown(prog);
if (layout)
flashrom_layout_release(layout);
if (flashctx)
flashrom_flash_release(flashctx);
return r;
}
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