95 lines
2.3 KiB
C
95 lines
2.3 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 "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(QTestState *qts)
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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] = qtest_readb(qts, 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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uint32_t acpi_get_rsdt_address(uint8_t *rsdp_table)
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{
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uint32_t rsdt_physical_address;
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memcpy(&rsdt_physical_address, &rsdp_table[16 /* RsdtAddress offset */], 4);
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return le32_to_cpu(rsdt_physical_address);
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}
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uint64_t acpi_get_xsdt_address(uint8_t *rsdp_table)
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{
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uint64_t xsdt_physical_address;
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uint8_t revision = rsdp_table[15 /* Revision offset */];
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/* We must have revision 2 if we're looking for an XSDT pointer */
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g_assert(revision == 2);
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memcpy(&xsdt_physical_address, &rsdp_table[24 /* XsdtAddress offset */], 8);
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return le64_to_cpu(xsdt_physical_address);
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}
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void acpi_parse_rsdp_table(QTestState *qts, uint32_t addr, uint8_t *rsdp_table)
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{
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uint8_t revision;
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/* Read mandatory revision 0 table data (20 bytes) first */
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qtest_memread(qts, addr, rsdp_table, 20);
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revision = rsdp_table[15 /* Revision offset */];
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switch (revision) {
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case 0: /* ACPI 1.0 RSDP */
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break;
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case 2: /* ACPI 2.0+ RSDP */
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/* Read the rest of the RSDP table */
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qtest_memread(qts, addr + 20, rsdp_table + 20, 16);
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break;
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default:
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g_assert_not_reached();
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}
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ACPI_ASSERT_CMP64(*((uint64_t *)(rsdp_table)), "RSD PTR ");
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}
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