The requirement to provide an -hda argument when doing a direct boot of a linux kernel has irritated me for some time. This patch removes that requirement by creating a temporary 1 sector hda as needed.
Ross
Index: hw/pc.c
===================================================================
RCS file: /cvsroot/qemu/qemu/hw/pc.c,v
retrieving revision 1.35
diff -u -p -r1.35 pc.c
--- hw/pc.c 15 Jan 2005 12:02:56 -0000 1.35
+++ hw/pc.c 27 Apr 2005 02:29:20 -0000
@@ -446,8 +446,26 @@ void pc_init(int ram_size, int vga_ram_s
uint8_t old_bootsect[512];
if (bs_table[0] == NULL) {
- fprintf(stderr, "A disk image must be given for 'hda' when booting a Linux kernel\n");
- exit(1);
+ char template[] = "/tmp/qemu.XXXXXX";
+ int tmpfile = mkstemp(template);
+
+ fprintf(stderr, "qemu: Disk image not given for 'hda' when booting"
+ " a Linux kernel; inventing one\n");
+ if(tmpfile == -1) {
+ fprintf(stderr, "qemu: couldn't create temporary diskimage\n");
+ exit(1);
+ }
+ lseek(tmpfile, 511, SEEK_SET);
+ write(tmpfile, "", 1);
+ bs_table[0] = bdrv_new("hda");
+ if (bdrv_open(bs_table[0], template, snapshot) < 0) {
+ fprintf(stderr, "qemu: could not load temporary diskimage '%s'\n",
+ template);
+ exit(1);
+ }
+ close(tmpfile);
+ unlink(template);
+ boot_device = 'c';
}
snprintf(buf, sizeof(buf), "%s/%s", bios_dir, LINUX_BOOT_FILENAME);
ret = load_image(buf, bootsect);
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