LXR qemu/tests/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-common.h"
  18#include "hw/smbios/smbios.h"
  19#include "qemu/bitmap.h"
  20#include "acpi-utils.h"
  21#include "boot-sector.h"
  22
  23uint8_t acpi_calc_checksum(const uint8_t *data, int len)
  24{
  25    int i;
  26    uint8_t sum = 0;
  27
  28    for (i = 0; i < len; i++) {
  29        sum += data[i];
  30    }
  31
  32    return sum;
  33}
  34
  35uint32_t acpi_find_rsdp_address(void)
  36{
  37    uint32_t off;
  38
  39    /* RSDP location can vary across a narrow range */
  40    for (off = 0xf0000; off < 0x100000; off += 0x10) {
  41        uint8_t sig[] = "RSD PTR ";
  42        int i;
  43
  44        for (i = 0; i < sizeof sig - 1; ++i) {
  45            sig[i] = readb(off + i);
  46        }
  47
  48        if (!memcmp(sig, "RSD PTR ", sizeof sig)) {
  49            break;
  50        }
  51    }
  52    return off;
  53}
  54
  55void acpi_parse_rsdp_table(uint32_t addr, AcpiRsdpDescriptor *rsdp_table)
  56{
  57    ACPI_READ_FIELD(rsdp_table->signature, addr);
  58    ACPI_ASSERT_CMP64(rsdp_table->signature, "RSD PTR ");
  59
  60    ACPI_READ_FIELD(rsdp_table->checksum, addr);
  61    ACPI_READ_ARRAY(rsdp_table->oem_id, addr);
  62    ACPI_READ_FIELD(rsdp_table->revision, addr);
  63    ACPI_READ_FIELD(rsdp_table->rsdt_physical_address, addr);
  64    ACPI_READ_FIELD(rsdp_table->length, addr);
  65}
  66