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b1dd6d2d27
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>
169 lines
5.1 KiB
C
169 lines
5.1 KiB
C
/*
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* QEMU boot sector testing helpers.
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*
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* Copyright (c) 2016 Red Hat Inc.
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*
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* Authors:
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* Michael S. Tsirkin <mst@redhat.com>
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* Victor Kaplansky <victork@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "boot-sector.h"
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#include "qemu-common.h"
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#include "libqtest.h"
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#define LOW(x) ((x) & 0xff)
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#define HIGH(x) ((x) >> 8)
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#define SIGNATURE 0xdead
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#define SIGNATURE_OFFSET 0x10
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#define BOOT_SECTOR_ADDRESS 0x7c00
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#define SIGNATURE_ADDR (BOOT_SECTOR_ADDRESS + SIGNATURE_OFFSET)
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/* x86 boot sector code: write SIGNATURE into memory,
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* then halt.
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*/
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static uint8_t x86_boot_sector[512] = {
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/* The first sector will be placed at RAM address 00007C00, and
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* the BIOS transfers control to 00007C00
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*/
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/* Data Segment register should be initialized, since pxe
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* boot loader can leave it dirty.
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*/
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/* 7c00: move $0000,%ax */
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[0x00] = 0xb8,
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[0x01] = 0x00,
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[0x02] = 0x00,
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/* 7c03: move %ax,%ds */
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[0x03] = 0x8e,
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[0x04] = 0xd8,
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/* 7c05: mov $0xdead,%ax */
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[0x05] = 0xb8,
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[0x06] = LOW(SIGNATURE),
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[0x07] = HIGH(SIGNATURE),
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/* 7c08: mov %ax,0x7c10 */
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[0x08] = 0xa3,
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[0x09] = LOW(SIGNATURE_ADDR),
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[0x0a] = HIGH(SIGNATURE_ADDR),
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/* 7c0b cli */
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[0x0b] = 0xfa,
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/* 7c0c: hlt */
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[0x0c] = 0xf4,
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/* 7c0e: jmp 0x7c07=0x7c0f-3 */
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[0x0d] = 0xeb,
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[0x0e] = LOW(-3),
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/* We mov 0xdead here: set value to make debugging easier */
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[SIGNATURE_OFFSET] = LOW(0xface),
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[SIGNATURE_OFFSET + 1] = HIGH(0xface),
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/* End of boot sector marker */
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[0x1FE] = 0x55,
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[0x1FF] = 0xAA,
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};
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/* For s390x, use a mini "kernel" with the appropriate signature */
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static const uint8_t s390x_psw_and_magic[] = {
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0x00, 0x08, 0x00, 0x00, 0x80, 0x01, 0x00, 0x00, /* Program status word */
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0x02, 0x00, 0x00, 0x18, 0x60, 0x00, 0x00, 0x50, /* Magic: */
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0x02, 0x00, 0x00, 0x68, 0x60, 0x00, 0x00, 0x50, /* see linux_s390_magic */
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0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 /* in the s390-ccw bios */
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};
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static const uint8_t s390x_code[] = {
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0xa7, 0xf4, 0x00, 0x0a, /* j 0x10010 */
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0x00, 0x00, 0x00, 0x00,
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'S', '3', '9', '0',
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'E', 'P', 0x00, 0x01,
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0xa7, 0x38, HIGH(SIGNATURE_ADDR), LOW(SIGNATURE_ADDR), /* lhi r3,0x7c10 */
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0xa7, 0x48, LOW(SIGNATURE), HIGH(SIGNATURE), /* lhi r4,0xadde */
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0x40, 0x40, 0x30, 0x00, /* sth r4,0(r3) */
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0xa7, 0xf4, 0xff, 0xfa /* j 0x10010 */
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};
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/* Create boot disk file. */
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int boot_sector_init(char *fname)
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{
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int fd, ret;
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size_t len;
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char *boot_code;
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const char *arch = qtest_get_arch();
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fd = mkstemp(fname);
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if (fd < 0) {
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fprintf(stderr, "Couldn't open \"%s\": %s", fname, strerror(errno));
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return 1;
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}
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if (g_str_equal(arch, "i386") || g_str_equal(arch, "x86_64")) {
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/* Q35 requires a minimum 0x7e000 bytes disk (bug or feature?) */
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len = MAX(0x7e000, sizeof(x86_boot_sector));
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boot_code = g_malloc0(len);
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memcpy(boot_code, x86_boot_sector, sizeof(x86_boot_sector));
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} else if (g_str_equal(arch, "ppc64")) {
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/* For Open Firmware based system, use a Forth script */
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boot_code = g_strdup_printf("\\ Bootscript\n%x %x c! %x %x c!\n",
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LOW(SIGNATURE), SIGNATURE_ADDR,
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HIGH(SIGNATURE), SIGNATURE_ADDR + 1);
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len = strlen(boot_code);
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} else if (g_str_equal(arch, "s390x")) {
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len = 0x10000 + sizeof(s390x_code);
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boot_code = g_malloc0(len);
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memcpy(boot_code, s390x_psw_and_magic, sizeof(s390x_psw_and_magic));
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memcpy(&boot_code[0x10000], s390x_code, sizeof(s390x_code));
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} else {
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g_assert_not_reached();
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}
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ret = write(fd, boot_code, len);
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close(fd);
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g_free(boot_code);
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if (ret != len) {
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fprintf(stderr, "Could not write \"%s\"", fname);
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return 1;
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}
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return 0;
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}
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/* Loop until signature in memory is OK. */
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void boot_sector_test(QTestState *qts)
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{
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uint8_t signature_low;
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uint8_t signature_high;
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uint16_t signature;
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int i;
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/* Wait at most 600 seconds (test is slow with TCI and --enable-debug) */
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#define TEST_DELAY (1 * G_USEC_PER_SEC / 10)
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#define TEST_CYCLES MAX((600 * G_USEC_PER_SEC / TEST_DELAY), 1)
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/* Poll until code has run and modified memory. Once it has we know BIOS
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* initialization is done. TODO: check that IP reached the halt
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* instruction.
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*/
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for (i = 0; i < TEST_CYCLES; ++i) {
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signature_low = qtest_readb(qts, SIGNATURE_ADDR);
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signature_high = qtest_readb(qts, SIGNATURE_ADDR + 1);
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signature = (signature_high << 8) | signature_low;
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if (signature == SIGNATURE) {
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break;
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}
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g_usleep(TEST_DELAY);
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}
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g_assert_cmphex(signature, ==, SIGNATURE);
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}
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/* unlink boot disk file. */
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void boot_sector_cleanup(const char *fname)
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{
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unlink(fname);
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}
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