tests/qtest/acpi-utils.c

   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
  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
  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
  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  */
  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
 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 }