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https://github.com/xen-project/xen.git
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Keir Fraser
86f69d44ae
This patch adds extboot to Xen. It should be pretty harmless as the moment because it's never enabled. extboot allows arbitrary block devices to be used to boot guests including SCSI and PV disks. I've tested it with both Windows and Linux guests in QEMU. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/*
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* Extended Boot Option ROM
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright IBM Corporation, 2007
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* Authors: Anthony Liguori <aliguori@us.ibm.com>
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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int main(int argc, char **argv)
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{
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FILE *fin, *fout;
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char buffer[512], oldbuffer[512];
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int i, size, lag = 0;
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uint8_t sum = 0;
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if (argc != 3) {
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printf("Usage: %s ROM OUTPUT\n", argv[0]);
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return 1;
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}
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fin = fopen(argv[1], "rb");
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fout = fopen(argv[2], "wb");
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if (fin == NULL || fout == NULL) {
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fprintf(stderr, "Could not open input/output files\n");
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return 1;
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}
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do {
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size = fread(buffer, 512, 1, fin);
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if (size == 1) {
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for (i = 0; i < 512; i++)
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sum += buffer[i];
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if (lag) {
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if (fwrite(oldbuffer, 512, 1, fout) != 1) {
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fprintf(stderr, "Write failed\n");
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return 1;
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}
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}
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lag = 1;
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memcpy(oldbuffer, buffer, 512);
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}
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} while (size == 1);
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if (size != 0) {
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fprintf(stderr, "Failed to read from input file\n");
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return 1;
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}
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oldbuffer[511] = -sum;
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if (fwrite(oldbuffer, 512, 1, fout) != 1) {
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fprintf(stderr, "Failed to write to output file\n");
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return 1;
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}
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fclose(fin);
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fclose(fout);
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return 0;
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}
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