xref: /openbmc/qemu/tests/qtest/acpi-utils.c (revision 0f9668e0)
1 /*
2  * ACPI Utility Functions
3  *
4  * Copyright (c) 2013 Red Hat Inc.
5  * Copyright (c) 2017 Skyport Systems
6  *
7  * Authors:
8  *  Michael S. Tsirkin <mst@redhat.com>,
9  *  Ben Warren <ben@skyportsystems.com>
10  *
11  * This work is licensed under the terms of the GNU GPL, version 2 or later.
12  * See the COPYING file in the top-level directory.
13  */
14 
15 #include "qemu/osdep.h"
16 #include <glib/gstdio.h>
17 #include "qemu/bitmap.h"
18 #include "acpi-utils.h"
19 #include "boot-sector.h"
20 
acpi_calc_checksum(const uint8_t * data,int len)21 uint8_t acpi_calc_checksum(const uint8_t *data, int len)
22 {
23     int i;
24     uint8_t sum = 0;
25 
26     for (i = 0; i < len; i++) {
27         sum += data[i];
28     }
29 
30     return sum;
31 }
32 
acpi_find_rsdp_address(QTestState * qts)33 uint32_t acpi_find_rsdp_address(QTestState *qts)
34 {
35     uint32_t off;
36 
37     /* RSDP location can vary across a narrow range */
38     for (off = 0xf0000; off < 0x100000; off += 0x10) {
39         uint8_t sig[] = "RSD PTR ";
40         int i;
41 
42         for (i = 0; i < sizeof sig - 1; ++i) {
43             sig[i] = qtest_readb(qts, off + i);
44         }
45 
46         if (!memcmp(sig, "RSD PTR ", sizeof sig)) {
47             break;
48         }
49     }
50     return off;
51 }
52 
acpi_fetch_rsdp_table(QTestState * qts,uint64_t addr,uint8_t * rsdp_table)53 void acpi_fetch_rsdp_table(QTestState *qts, uint64_t addr, uint8_t *rsdp_table)
54 {
55     uint8_t revision;
56 
57     /* Read mandatory revision 0 table data (20 bytes) first */
58     qtest_memread(qts, addr, rsdp_table, 20);
59     revision = rsdp_table[15 /* Revision offset */];
60 
61     switch (revision) {
62     case 0: /* ACPI 1.0 RSDP */
63         break;
64     case 2: /* ACPI 2.0+ RSDP */
65         /* Read the rest of the RSDP table */
66         qtest_memread(qts, addr + 20, rsdp_table + 20, 16);
67         break;
68     default:
69         g_assert_not_reached();
70     }
71 
72     ACPI_ASSERT_CMP64(*((uint64_t *)(rsdp_table)), "RSD PTR ");
73 }
74 
75 /** acpi_fetch_table
76  *  load ACPI table at @addr_ptr offset pointer into buffer and return it in
77  *  @aml, its length in @aml_len and check that signature/checksum matches
78  *  actual one.
79  */
acpi_fetch_table(QTestState * qts,uint8_t ** aml,uint32_t * aml_len,const uint8_t * addr_ptr,int addr_size,const char * sig,bool verify_checksum)80 void acpi_fetch_table(QTestState *qts, uint8_t **aml, uint32_t *aml_len,
81                       const uint8_t *addr_ptr, int addr_size, const char *sig,
82                       bool verify_checksum)
83 {
84     uint32_t len;
85     uint64_t addr = 0;
86 
87     g_assert(addr_size == 4 || addr_size == 8);
88     memcpy(&addr, addr_ptr , addr_size);
89     addr = le64_to_cpu(addr);
90     qtest_memread(qts, addr + 4, &len, 4); /* Length of ACPI table */
91     *aml_len = le32_to_cpu(len);
92     *aml = g_malloc0(*aml_len);
93     /* get whole table */
94     qtest_memread(qts, addr, *aml, *aml_len);
95 
96     if (sig) {
97         ACPI_ASSERT_CMP(**aml, sig);
98     }
99     if (verify_checksum) {
100         if (acpi_calc_checksum(*aml, *aml_len)) {
101             gint fd, ret;
102             char *fname = NULL;
103             GError *error = NULL;
104 
105             fprintf(stderr, "Invalid '%.4s'(%d)\n", *aml, *aml_len);
106             fd = g_file_open_tmp("malformed-XXXXXX.dat", &fname, &error);
107             g_assert_no_error(error);
108             fprintf(stderr, "Dumping invalid table into '%s'\n", fname);
109             ret = qemu_write_full(fd, *aml, *aml_len);
110             g_assert(ret == *aml_len);
111             close(fd);
112             g_free(fname);
113         }
114         g_assert(!acpi_calc_checksum(*aml, *aml_len));
115     }
116 }
117 
118 #define GUID_SIZE 16
119 static const uint8_t AcpiTestSupportGuid[GUID_SIZE] = {
120        0xb1, 0xa6, 0x87, 0xab,
121        0x34, 0x20,
122        0xa0, 0xbd,
123        0x71, 0xbd, 0x37, 0x50, 0x07, 0x75, 0x77, 0x85 };
124 
125 typedef struct {
126     uint8_t signature_guid[GUID_SIZE];
127     uint64_t rsdp10;
128     uint64_t rsdp20;
129 } __attribute__((packed)) UefiTestSupport;
130 
131 /* Wait at most 600 seconds (test is slow with TCG and --enable-debug) */
132 #define TEST_DELAY (1 * G_USEC_PER_SEC / 10)
133 #define TEST_CYCLES MAX((600 * G_USEC_PER_SEC / TEST_DELAY), 1)
134 #define MB 0x100000ULL
acpi_find_rsdp_address_uefi(QTestState * qts,uint64_t start,uint64_t size)135 uint64_t acpi_find_rsdp_address_uefi(QTestState *qts, uint64_t start,
136                                      uint64_t size)
137 {
138     int i, j;
139     uint8_t data[GUID_SIZE];
140 
141     for (i = 0; i < TEST_CYCLES; ++i) {
142         for (j = 0; j < size / MB; j++) {
143             /* look for GUID at every 1Mb block */
144             uint64_t addr = start + j * MB;
145 
146             qtest_memread(qts, addr, data, sizeof(data));
147             if (!memcmp(AcpiTestSupportGuid, data, sizeof(data))) {
148                 UefiTestSupport ret;
149 
150                 qtest_memread(qts, addr, &ret, sizeof(ret));
151                 ret.rsdp10 = le64_to_cpu(ret.rsdp10);
152                 ret.rsdp20 = le64_to_cpu(ret.rsdp20);
153                 return ret.rsdp20 ? ret.rsdp20 : ret.rsdp10;
154             }
155         }
156         g_usleep(TEST_DELAY);
157     }
158     g_assert_not_reached();
159     return 0;
160 }
161