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Victor Kaplansky4e082562016-02-14 18:59:27 +02001/*
2 * QEMU boot sector testing helpers.
3 *
4 * Copyright (c) 2016 Red Hat Inc.
5 *
6 * Authors:
7 * Michael S. Tsirkin <mst@redhat.com>
Eric Blake8b19f2b2017-09-11 12:20:07 -05008 * Victor Kaplansky <victork@redhat.com>
Victor Kaplansky4e082562016-02-14 18:59:27 +02009 *
10 * This work is licensed under the terms of the GNU GPL, version 2 or later.
11 * See the COPYING file in the top-level directory.
12 */
Peter Maydell974dc732016-02-23 12:00:47 +000013#include "qemu/osdep.h"
Victor Kaplansky4e082562016-02-14 18:59:27 +020014#include "boot-sector.h"
Victor Kaplansky4e082562016-02-14 18:59:27 +020015#include "qemu-common.h"
16#include "libqtest.h"
17
18#define LOW(x) ((x) & 0xff)
19#define HIGH(x) ((x) >> 8)
20
21#define SIGNATURE 0xdead
22#define SIGNATURE_OFFSET 0x10
23#define BOOT_SECTOR_ADDRESS 0x7c00
Thomas Huth83898cc2017-08-11 07:57:55 +020024#define SIGNATURE_ADDR (BOOT_SECTOR_ADDRESS + SIGNATURE_OFFSET)
Victor Kaplansky4e082562016-02-14 18:59:27 +020025
Thomas Huth83898cc2017-08-11 07:57:55 +020026/* x86 boot sector code: write SIGNATURE into memory,
Victor Kaplansky4e082562016-02-14 18:59:27 +020027 * then halt.
Victor Kaplansky4e082562016-02-14 18:59:27 +020028 */
Thomas Huth83898cc2017-08-11 07:57:55 +020029static uint8_t x86_boot_sector[512] = {
Victor Kaplansky4e082562016-02-14 18:59:27 +020030 /* The first sector will be placed at RAM address 00007C00, and
31 * the BIOS transfers control to 00007C00
32 */
33
34 /* Data Segment register should be initialized, since pxe
35 * boot loader can leave it dirty.
36 */
37
38 /* 7c00: move $0000,%ax */
39 [0x00] = 0xb8,
40 [0x01] = 0x00,
41 [0x02] = 0x00,
42 /* 7c03: move %ax,%ds */
43 [0x03] = 0x8e,
44 [0x04] = 0xd8,
45
46 /* 7c05: mov $0xdead,%ax */
47 [0x05] = 0xb8,
48 [0x06] = LOW(SIGNATURE),
49 [0x07] = HIGH(SIGNATURE),
50 /* 7c08: mov %ax,0x7c10 */
51 [0x08] = 0xa3,
Thomas Huth83898cc2017-08-11 07:57:55 +020052 [0x09] = LOW(SIGNATURE_ADDR),
53 [0x0a] = HIGH(SIGNATURE_ADDR),
Victor Kaplansky4e082562016-02-14 18:59:27 +020054
55 /* 7c0b cli */
56 [0x0b] = 0xfa,
57 /* 7c0c: hlt */
58 [0x0c] = 0xf4,
59 /* 7c0e: jmp 0x7c07=0x7c0f-3 */
60 [0x0d] = 0xeb,
61 [0x0e] = LOW(-3),
62 /* We mov 0xdead here: set value to make debugging easier */
63 [SIGNATURE_OFFSET] = LOW(0xface),
64 [SIGNATURE_OFFSET + 1] = HIGH(0xface),
65 /* End of boot sector marker */
66 [0x1FE] = 0x55,
67 [0x1FF] = 0xAA,
68};
69
Thomas Huthb1b2fea2017-08-11 07:57:56 +020070/* For s390x, use a mini "kernel" with the appropriate signature */
Thomas Huthb1dd6d22018-06-08 13:17:39 -040071static const uint8_t s390x_psw_and_magic[] = {
72 0x00, 0x08, 0x00, 0x00, 0x80, 0x01, 0x00, 0x00, /* Program status word */
73 0x02, 0x00, 0x00, 0x18, 0x60, 0x00, 0x00, 0x50, /* Magic: */
74 0x02, 0x00, 0x00, 0x68, 0x60, 0x00, 0x00, 0x50, /* see linux_s390_magic */
75 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 /* in the s390-ccw bios */
Thomas Huthb1b2fea2017-08-11 07:57:56 +020076};
77static const uint8_t s390x_code[] = {
78 0xa7, 0xf4, 0x00, 0x0a, /* j 0x10010 */
79 0x00, 0x00, 0x00, 0x00,
80 'S', '3', '9', '0',
81 'E', 'P', 0x00, 0x01,
82 0xa7, 0x38, HIGH(SIGNATURE_ADDR), LOW(SIGNATURE_ADDR), /* lhi r3,0x7c10 */
83 0xa7, 0x48, LOW(SIGNATURE), HIGH(SIGNATURE), /* lhi r4,0xadde */
84 0x40, 0x40, 0x30, 0x00, /* sth r4,0(r3) */
85 0xa7, 0xf4, 0xff, 0xfa /* j 0x10010 */
86};
87
Victor Kaplansky4e082562016-02-14 18:59:27 +020088/* Create boot disk file. */
Thomas Huth3e353772016-10-11 17:19:36 +020089int boot_sector_init(char *fname)
Victor Kaplansky4e082562016-02-14 18:59:27 +020090{
Thomas Huth3e353772016-10-11 17:19:36 +020091 int fd, ret;
Thomas Huth83898cc2017-08-11 07:57:55 +020092 size_t len;
93 char *boot_code;
94 const char *arch = qtest_get_arch();
Victor Kaplansky4e082562016-02-14 18:59:27 +020095
Thomas Huth3e353772016-10-11 17:19:36 +020096 fd = mkstemp(fname);
97 if (fd < 0) {
Victor Kaplansky4e082562016-02-14 18:59:27 +020098 fprintf(stderr, "Couldn't open \"%s\": %s", fname, strerror(errno));
99 return 1;
100 }
Thomas Huth1485ef12016-09-26 22:17:46 +0200101
Thomas Huth83898cc2017-08-11 07:57:55 +0200102 if (g_str_equal(arch, "i386") || g_str_equal(arch, "x86_64")) {
103 /* Q35 requires a minimum 0x7e000 bytes disk (bug or feature?) */
104 len = MAX(0x7e000, sizeof(x86_boot_sector));
105 boot_code = g_malloc0(len);
106 memcpy(boot_code, x86_boot_sector, sizeof(x86_boot_sector));
107 } else if (g_str_equal(arch, "ppc64")) {
108 /* For Open Firmware based system, use a Forth script */
109 boot_code = g_strdup_printf("\\ Bootscript\n%x %x c! %x %x c!\n",
110 LOW(SIGNATURE), SIGNATURE_ADDR,
111 HIGH(SIGNATURE), SIGNATURE_ADDR + 1);
112 len = strlen(boot_code);
Thomas Huthb1b2fea2017-08-11 07:57:56 +0200113 } else if (g_str_equal(arch, "s390x")) {
114 len = 0x10000 + sizeof(s390x_code);
115 boot_code = g_malloc0(len);
Thomas Huthb1dd6d22018-06-08 13:17:39 -0400116 memcpy(boot_code, s390x_psw_and_magic, sizeof(s390x_psw_and_magic));
Thomas Huthb1b2fea2017-08-11 07:57:56 +0200117 memcpy(&boot_code[0x10000], s390x_code, sizeof(s390x_code));
Thomas Huth83898cc2017-08-11 07:57:55 +0200118 } else {
119 g_assert_not_reached();
Thomas Huth1485ef12016-09-26 22:17:46 +0200120 }
121
Thomas Huth83898cc2017-08-11 07:57:55 +0200122 ret = write(fd, boot_code, len);
Thomas Huth3e353772016-10-11 17:19:36 +0200123 close(fd);
124
Thomas Huth83898cc2017-08-11 07:57:55 +0200125 g_free(boot_code);
126
Thomas Huth3e353772016-10-11 17:19:36 +0200127 if (ret != len) {
128 fprintf(stderr, "Could not write \"%s\"", fname);
129 return 1;
130 }
131
Victor Kaplansky4e082562016-02-14 18:59:27 +0200132 return 0;
133}
134
135/* Loop until signature in memory is OK. */
Eric Blake8b19f2b2017-09-11 12:20:07 -0500136void boot_sector_test(QTestState *qts)
Victor Kaplansky4e082562016-02-14 18:59:27 +0200137{
138 uint8_t signature_low;
139 uint8_t signature_high;
140 uint16_t signature;
141 int i;
142
Thomas Huth07897002017-09-22 05:06:57 +0200143 /* Wait at most 600 seconds (test is slow with TCI and --enable-debug) */
Victor Kaplansky4e082562016-02-14 18:59:27 +0200144#define TEST_DELAY (1 * G_USEC_PER_SEC / 10)
Thomas Huth07897002017-09-22 05:06:57 +0200145#define TEST_CYCLES MAX((600 * G_USEC_PER_SEC / TEST_DELAY), 1)
Victor Kaplansky4e082562016-02-14 18:59:27 +0200146
147 /* Poll until code has run and modified memory. Once it has we know BIOS
148 * initialization is done. TODO: check that IP reached the halt
149 * instruction.
150 */
151 for (i = 0; i < TEST_CYCLES; ++i) {
Eric Blake8b19f2b2017-09-11 12:20:07 -0500152 signature_low = qtest_readb(qts, SIGNATURE_ADDR);
153 signature_high = qtest_readb(qts, SIGNATURE_ADDR + 1);
Victor Kaplansky4e082562016-02-14 18:59:27 +0200154 signature = (signature_high << 8) | signature_low;
155 if (signature == SIGNATURE) {
156 break;
157 }
158 g_usleep(TEST_DELAY);
159 }
160
161 g_assert_cmphex(signature, ==, SIGNATURE);
162}
163
164/* unlink boot disk file. */
165void boot_sector_cleanup(const char *fname)
166{
167 unlink(fname);
168}