Archipelago » qemu

%.bin: %.img signrom

	./signrom $< $@

signrom: signrom.c

	$(CC) -o $@ -g -Wall $^

	$(RM) *.o *.img *.bin signrom *~

/*

 * Extended Boot Option ROM

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 *

 * Copyright IBM Corporation, 2007

 *   Authors: Anthony Liguori <aliguori@us.ibm.com>

 */

#include <stdio.h>

#include <stdint.h>

#include <string.h>

int main(int argc, char **argv)

{

	FILE *fin, *fout;

	char buffer[512], oldbuffer[512];

	int i, size, lag = 0;

	uint8_t sum = 0;

	if (argc != 3) {

		printf("Usage: %s ROM OUTPUT\n", argv[0]);

		return 1;

	}

	fin = fopen(argv[1], "rb");

	fout = fopen(argv[2], "wb");

	if (fin == NULL || fout == NULL) {

		fprintf(stderr, "Could not open input/output files\n");

		return 1;

	}

	do {

		size = fread(buffer, 512, 1, fin);

		if (size == 1) {

			for (i = 0; i < 512; i++)

				sum += buffer[i];

			if (lag) {

				if (fwrite(oldbuffer, 512, 1, fout) != 1) {

					fprintf(stderr, "Write failed\n");

					return 1;

				}

			}

			lag = 1;

			memcpy(oldbuffer, buffer, 512);

		}

	} while (size == 1);

	if (size != 0) {

		fprintf(stderr, "Failed to read from input file\n");

		return 1;

	}

	oldbuffer[511] = -sum;

	if (fwrite(oldbuffer, 512, 1, fout) != 1) {

		fprintf(stderr, "Failed to write to output file\n");

		return 1;

	}

	fclose(fin);

	fclose(fout);

	return 0;

}