cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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acpi-utils.c (4023B)

      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-common.h"
     18#include "qemu/bitmap.h"
     19#include "acpi-utils.h"
     20#include "boot-sector.h"
     21
     22uint8_t acpi_calc_checksum(const uint8_t *data, int len)
     23{
     24    int i;
     25    uint8_t sum = 0;
     26
     27    for (i = 0; i < len; i++) {
     28        sum += data[i];
     29    }
     30
     31    return sum;
     32}
     33
     34uint32_t acpi_find_rsdp_address(QTestState *qts)
     35{
     36    uint32_t off;
     37
     38    /* RSDP location can vary across a narrow range */
     39    for (off = 0xf0000; off < 0x100000; off += 0x10) {
     40        uint8_t sig[] = "RSD PTR ";
     41        int i;
     42
     43        for (i = 0; i < sizeof sig - 1; ++i) {
     44            sig[i] = qtest_readb(qts, off + i);
     45        }
     46
     47        if (!memcmp(sig, "RSD PTR ", sizeof sig)) {
     48            break;
     49        }
     50    }
     51    return off;
     52}
     53
     54void acpi_fetch_rsdp_table(QTestState *qts, uint64_t addr, uint8_t *rsdp_table)
     55{
     56    uint8_t revision;
     57
     58    /* Read mandatory revision 0 table data (20 bytes) first */
     59    qtest_memread(qts, addr, rsdp_table, 20);
     60    revision = rsdp_table[15 /* Revision offset */];
     61
     62    switch (revision) {
     63    case 0: /* ACPI 1.0 RSDP */
     64        break;
     65    case 2: /* ACPI 2.0+ RSDP */
     66        /* Read the rest of the RSDP table */
     67        qtest_memread(qts, addr + 20, rsdp_table + 20, 16);
     68        break;
     69    default:
     70        g_assert_not_reached();
     71    }
     72
     73    ACPI_ASSERT_CMP64(*((uint64_t *)(rsdp_table)), "RSD PTR ");
     74}
     75
     76/** acpi_fetch_table
     77 *  load ACPI table at @addr_ptr offset pointer into buffer and return it in
     78 *  @aml, its length in @aml_len and check that signature/checksum matches
     79 *  actual one.
     80 */
     81void acpi_fetch_table(QTestState *qts, uint8_t **aml, uint32_t *aml_len,
     82                      const uint8_t *addr_ptr, int addr_size, const char *sig,
     83                      bool verify_checksum)
     84{
     85    uint32_t len;
     86    uint64_t addr = 0;
     87
     88    g_assert(addr_size == 4 || addr_size == 8);
     89    memcpy(&addr, addr_ptr , addr_size);
     90    addr = le64_to_cpu(addr);
     91    qtest_memread(qts, addr + 4, &len, 4); /* Length of ACPI table */
     92    *aml_len = le32_to_cpu(len);
     93    *aml = g_malloc0(*aml_len);
     94    /* get whole table */
     95    qtest_memread(qts, addr, *aml, *aml_len);
     96
     97    if (sig) {
     98        ACPI_ASSERT_CMP(**aml, sig);
     99    }
    100    if (verify_checksum) {
    101        g_assert(!acpi_calc_checksum(*aml, *aml_len));
    102    }
    103}
    104
    105#define GUID_SIZE 16
    106static const uint8_t AcpiTestSupportGuid[GUID_SIZE] = {
    107       0xb1, 0xa6, 0x87, 0xab,
    108       0x34, 0x20,
    109       0xa0, 0xbd,
    110       0x71, 0xbd, 0x37, 0x50, 0x07, 0x75, 0x77, 0x85 };
    111
    112typedef struct {
    113    uint8_t signature_guid[GUID_SIZE];
    114    uint64_t rsdp10;
    115    uint64_t rsdp20;
    116} __attribute__((packed)) UefiTestSupport;
    117
    118/* Wait at most 600 seconds (test is slow with TCG and --enable-debug) */
    119#define TEST_DELAY (1 * G_USEC_PER_SEC / 10)
    120#define TEST_CYCLES MAX((600 * G_USEC_PER_SEC / TEST_DELAY), 1)
    121#define MB 0x100000ULL
    122uint64_t acpi_find_rsdp_address_uefi(QTestState *qts, uint64_t start,
    123                                     uint64_t size)
    124{
    125    int i, j;
    126    uint8_t data[GUID_SIZE];
    127
    128    for (i = 0; i < TEST_CYCLES; ++i) {
    129        for (j = 0; j < size / MB; j++) {
    130            /* look for GUID at every 1Mb block */
    131            uint64_t addr = start + j * MB;
    132
    133            qtest_memread(qts, addr, data, sizeof(data));
    134            if (!memcmp(AcpiTestSupportGuid, data, sizeof(data))) {
    135                UefiTestSupport ret;
    136
    137                qtest_memread(qts, addr, &ret, sizeof(ret));
    138                ret.rsdp10 = le64_to_cpu(ret.rsdp10);
    139                ret.rsdp20 = le64_to_cpu(ret.rsdp20);
    140                return ret.rsdp20 ? ret.rsdp20 : ret.rsdp10;
    141            }
    142        }
    143        g_usleep(TEST_DELAY);
    144    }
    145    g_assert_not_reached();
    146    return 0;
    147}