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/*
* ACPI Utility Functions
*
* Copyright (c) 2013 Red Hat Inc.
* Copyright (c) 2017 Skyport Systems
*
* Authors:
* Michael S. Tsirkin <mst@redhat.com>,
* Ben Warren <ben@skyportsystems.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include <glib/gstdio.h>
#include "qemu-common.h"
#include "qemu/bitmap.h"
#include "acpi-utils.h"
#include "boot-sector.h"
uint8_t acpi_calc_checksum(const uint8_t *data, int len)
{
int i;
uint8_t sum = 0;
for (i = 0; i < len; i++) {
sum += data[i];
}
return sum;
}
uint32_t acpi_find_rsdp_address(QTestState *qts)
{
uint32_t off;
/* RSDP location can vary across a narrow range */
for (off = 0xf0000; off < 0x100000; off += 0x10) {
uint8_t sig[] = "RSD PTR ";
int i;
for (i = 0; i < sizeof sig - 1; ++i) {
sig[i] = qtest_readb(qts, off + i);
}
if (!memcmp(sig, "RSD PTR ", sizeof sig)) {
break;
}
}
return off;
}
uint64_t acpi_get_xsdt_address(uint8_t *rsdp_table)
{
uint64_t xsdt_physical_address;
uint8_t revision = rsdp_table[15 /* Revision offset */];
/* We must have revision 2 if we're looking for an XSDT pointer */
g_assert(revision == 2);
memcpy(&xsdt_physical_address, &rsdp_table[24 /* XsdtAddress offset */], 8);
return le64_to_cpu(xsdt_physical_address);
}
void acpi_parse_rsdp_table(QTestState *qts, uint32_t addr, uint8_t *rsdp_table)
{
uint8_t revision;
/* Read mandatory revision 0 table data (20 bytes) first */
qtest_memread(qts, addr, rsdp_table, 20);
revision = rsdp_table[15 /* Revision offset */];
switch (revision) {
case 0: /* ACPI 1.0 RSDP */
break;
case 2: /* ACPI 2.0+ RSDP */
/* Read the rest of the RSDP table */
qtest_memread(qts, addr + 20, rsdp_table + 20, 16);
break;
default:
g_assert_not_reached();
}
ACPI_ASSERT_CMP64(*((uint64_t *)(rsdp_table)), "RSD PTR ");
}
/** acpi_fetch_table
* load ACPI table at @addr_ptr offset pointer into buffer and return it in
* @aml, its length in @aml_len and check that signature/checksum matches
* actual one.
*/
void acpi_fetch_table(QTestState *qts, uint8_t **aml, uint32_t *aml_len,
const uint8_t *addr_ptr, const char *sig,
bool verify_checksum)
{
uint32_t addr, len;
memcpy(&addr, addr_ptr , sizeof(addr));
addr = le32_to_cpu(addr);
qtest_memread(qts, addr + 4, &len, 4); /* Length of ACPI table */
*aml_len = le32_to_cpu(len);
*aml = g_malloc0(*aml_len);
/* get whole table */
qtest_memread(qts, addr, *aml, *aml_len);
if (sig) {
ACPI_ASSERT_CMP(**aml, sig);
}
if (verify_checksum) {
g_assert(!acpi_calc_checksum(*aml, *aml_len));
}
}
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