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/* Support for generating ACPI tables and passing them to Guests
*
* Copyright (C) 2015 Red Hat Inc
*
* Author: Michael S. Tsirkin <mst@redhat.com>
* Author: Igor Mammedov <imammedo@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <stdbool.h>
#include "hw/acpi/aml-build.h"
GArray *build_alloc_array(void)
{
return g_array_new(false, true /* clear */, 1);
}
void build_free_array(GArray *array)
{
g_array_free(array, true);
}
void build_prepend_byte(GArray *array, uint8_t val)
{
g_array_prepend_val(array, val);
}
void build_append_byte(GArray *array, uint8_t val)
{
g_array_append_val(array, val);
}
void build_append_array(GArray *array, GArray *val)
{
g_array_append_vals(array, val->data, val->len);
}
#define ACPI_NAMESEG_LEN 4
void GCC_FMT_ATTR(2, 3)
build_append_nameseg(GArray *array, const char *format, ...)
{
/* It would be nicer to use g_string_vprintf but it's only there in 2.22 */
char s[] = "XXXX";
int len;
va_list args;
va_start(args, format);
len = vsnprintf(s, sizeof s, format, args);
va_end(args);
assert(len <= ACPI_NAMESEG_LEN);
g_array_append_vals(array, s, len);
/* Pad up to ACPI_NAMESEG_LEN characters if necessary. */
g_array_append_vals(array, "____", ACPI_NAMESEG_LEN - len);
}
/* 5.4 Definition Block Encoding */
enum {
PACKAGE_LENGTH_1BYTE_SHIFT = 6, /* Up to 63 - use extra 2 bits. */
PACKAGE_LENGTH_2BYTE_SHIFT = 4,
PACKAGE_LENGTH_3BYTE_SHIFT = 12,
PACKAGE_LENGTH_4BYTE_SHIFT = 20,
};
void build_prepend_package_length(GArray *package, unsigned min_bytes)
{
uint8_t byte;
unsigned length = package->len;
unsigned length_bytes;
if (length + 1 < (1 << PACKAGE_LENGTH_1BYTE_SHIFT)) {
length_bytes = 1;
} else if (length + 2 < (1 << PACKAGE_LENGTH_3BYTE_SHIFT)) {
length_bytes = 2;
} else if (length + 3 < (1 << PACKAGE_LENGTH_4BYTE_SHIFT)) {
length_bytes = 3;
} else {
length_bytes = 4;
}
/* Force length to at least min_bytes.
* This wastes memory but that's how bios did it.
*/
length_bytes = MAX(length_bytes, min_bytes);
/* PkgLength is the length of the inclusive length of the data. */
length += length_bytes;
switch (length_bytes) {
case 1:
byte = length;
build_prepend_byte(package, byte);
return;
case 4:
byte = length >> PACKAGE_LENGTH_4BYTE_SHIFT;
build_prepend_byte(package, byte);
length &= (1 << PACKAGE_LENGTH_4BYTE_SHIFT) - 1;
/* fall through */
case 3:
byte = length >> PACKAGE_LENGTH_3BYTE_SHIFT;
build_prepend_byte(package, byte);
length &= (1 << PACKAGE_LENGTH_3BYTE_SHIFT) - 1;
/* fall through */
case 2:
byte = length >> PACKAGE_LENGTH_2BYTE_SHIFT;
build_prepend_byte(package, byte);
length &= (1 << PACKAGE_LENGTH_2BYTE_SHIFT) - 1;
/* fall through */
}
/*
* Most significant two bits of byte zero indicate how many following bytes
* are in PkgLength encoding.
*/
byte = ((length_bytes - 1) << PACKAGE_LENGTH_1BYTE_SHIFT) | length;
build_prepend_byte(package, byte);
}
void build_package(GArray *package, uint8_t op, unsigned min_bytes)
{
build_prepend_package_length(package, min_bytes);
build_prepend_byte(package, op);
}
void build_extop_package(GArray *package, uint8_t op)
{
build_package(package, op, 1);
build_prepend_byte(package, 0x5B); /* ExtOpPrefix */
}
void build_append_value(GArray *table, uint32_t value, int size)
{
uint8_t prefix;
int i;
switch (size) {
case 1:
prefix = 0x0A; /* BytePrefix */
break;
case 2:
prefix = 0x0B; /* WordPrefix */
break;
case 4:
prefix = 0x0C; /* DWordPrefix */
break;
default:
assert(0);
return;
}
build_append_byte(table, prefix);
for (i = 0; i < size; ++i) {
build_append_byte(table, value & 0xFF);
value = value >> 8;
}
}
void build_append_int(GArray *table, uint32_t value)
{
if (value == 0x00) {
build_append_byte(table, 0x00); /* ZeroOp */
} else if (value == 0x01) {
build_append_byte(table, 0x01); /* OneOp */
} else if (value <= 0xFF) {
build_append_value(table, value, 1);
} else if (value <= 0xFFFF) {
build_append_value(table, value, 2);
} else {
build_append_value(table, value, 4);
}
}
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