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tests/boot-sector: Add magic bytes to s390x boot code header

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We're going to use the s390x boot code for testing CD-ROM booting.
But the ISO loader of the s390-ccw bios is a little bit more picky
than the network loader and expects some magic bytes in the header
of the file (see linux_s390_magic in pc-bios/s390-ccw/bootmap.c), so
we've got to add them in our boot code here, too.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Hervé Poussineau <hpoussin@reactos.org>
Acked-By: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Thomas Huth 2018-06-08 13:17:39 -04:00 committed by John Snow
parent 017961262d
commit b1dd6d2d27
1 changed files with 6 additions and 3 deletions
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9
tests/boot-sector.c
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@ -68,8 +68,11 @@ static uint8_t x86_boot_sector[512] = {
};
/* For s390x, use a mini "kernel" with the appropriate signature */
static const uint8_t s390x_psw[] = {
0x00, 0x08, 0x00, 0x00, 0x80, 0x01, 0x00, 0x00
static const uint8_t s390x_psw_and_magic[] = {
0x00, 0x08, 0x00, 0x00, 0x80, 0x01, 0x00, 0x00, /* Program status word */
0x02, 0x00, 0x00, 0x18, 0x60, 0x00, 0x00, 0x50, /* Magic: */
0x02, 0x00, 0x00, 0x68, 0x60, 0x00, 0x00, 0x50, /* see linux_s390_magic */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 /* in the s390-ccw bios */
};
static const uint8_t s390x_code[] = {
0xa7, 0xf4, 0x00, 0x0a, /* j 0x10010 */
@ -110,7 +113,7 @@ int boot_sector_init(char *fname)
} else if (g_str_equal(arch, "s390x")) {
len = 0x10000 + sizeof(s390x_code);
boot_code = g_malloc0(len);
memcpy(boot_code, s390x_psw, sizeof(s390x_psw));
memcpy(boot_code, s390x_psw_and_magic, sizeof(s390x_psw_and_magic));
memcpy(&boot_code[0x10000], s390x_code, sizeof(s390x_code));
} else {
g_assert_not_reached();