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
  23 uint8_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
  35 uint32_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
  55 void 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 }