66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/*
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* ACPI Utility Functions
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*
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* Copyright (c) 2013 Red Hat Inc.
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* Copyright (c) 2017 Skyport Systems
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*
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* Authors:
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* Michael S. Tsirkin <mst@redhat.com>,
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* Ben Warren <ben@skyportsystems.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include <glib/gstdio.h>
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#include "qemu-common.h"
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#include "hw/smbios/smbios.h"
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#include "qemu/bitmap.h"
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#include "acpi-utils.h"
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#include "boot-sector.h"
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uint8_t acpi_calc_checksum(const uint8_t *data, int len)
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{
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int i;
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uint8_t sum = 0;
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for (i = 0; i < len; i++) {
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sum += data[i];
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}
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return sum;
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}
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uint32_t acpi_find_rsdp_address(void)
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{
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uint32_t off;
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/* RSDP location can vary across a narrow range */
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for (off = 0xf0000; off < 0x100000; off += 0x10) {
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uint8_t sig[] = "RSD PTR ";
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int i;
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for (i = 0; i < sizeof sig - 1; ++i) {
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sig[i] = readb(off + i);
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}
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if (!memcmp(sig, "RSD PTR ", sizeof sig)) {
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break;
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}
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}
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return off;
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}
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void acpi_parse_rsdp_table(uint32_t addr, AcpiRsdpDescriptor *rsdp_table)
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{
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ACPI_READ_FIELD(rsdp_table->signature, addr);
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ACPI_ASSERT_CMP64(rsdp_table->signature, "RSD PTR ");
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ACPI_READ_FIELD(rsdp_table->checksum, addr);
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ACPI_READ_ARRAY(rsdp_table->oem_id, addr);
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ACPI_READ_FIELD(rsdp_table->revision, addr);
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ACPI_READ_FIELD(rsdp_table->rsdt_physical_address, addr);
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ACPI_READ_FIELD(rsdp_table->length, addr);
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}
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