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/*
* ACPI implementation
*
* Copyright (c) 2006 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2 as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>
*/
#include "hw.h"
#include "pc.h"
#include "acpi.h"
#include "kvm.h"
#include "qemu-kvm.h"
#include "string.h"
struct acpi_table_header
{
char signature [4]; /* ACPI signature (4 ASCII characters) */
uint32_t length; /* Length of table, in bytes, including header */
uint8_t revision; /* ACPI Specification minor version # */
uint8_t checksum; /* To make sum of entire table == 0 */
char oem_id [6]; /* OEM identification */
char oem_table_id [8]; /* OEM table identification */
uint32_t oem_revision; /* OEM revision number */
char asl_compiler_id [4]; /* ASL compiler vendor ID */
uint32_t asl_compiler_revision; /* ASL compiler revision number */
} __attribute__((packed));
char *acpi_tables;
size_t acpi_tables_len;
static int acpi_checksum(const uint8_t *data, int len)
{
int sum, i;
sum = 0;
for(i = 0; i < len; i++)
sum += data[i];
return (-sum) & 0xff;
}
int acpi_table_add(const char *t)
{
static const char *dfl_id = "QEMUQEMU";
char buf[1024], *p, *f;
struct acpi_table_header acpi_hdr;
unsigned long val;
uint32_t length;
struct acpi_table_header *acpi_hdr_p;
size_t off;
memset(&acpi_hdr, 0, sizeof(acpi_hdr));
if (get_param_value(buf, sizeof(buf), "sig", t)) {
strncpy(acpi_hdr.signature, buf, 4);
} else {
strncpy(acpi_hdr.signature, dfl_id, 4);
}
if (get_param_value(buf, sizeof(buf), "rev", t)) {
val = strtoul(buf, &p, 10);
if (val > 255 || *p != '\0')
goto out;
} else {
val = 1;
}
acpi_hdr.revision = (int8_t)val;
if (get_param_value(buf, sizeof(buf), "oem_id", t)) {
strncpy(acpi_hdr.oem_id, buf, 6);
} else {
strncpy(acpi_hdr.oem_id, dfl_id, 6);
}
if (get_param_value(buf, sizeof(buf), "oem_table_id", t)) {
strncpy(acpi_hdr.oem_table_id, buf, 8);
} else {
strncpy(acpi_hdr.oem_table_id, dfl_id, 8);
}
if (get_param_value(buf, sizeof(buf), "oem_rev", t)) {
val = strtol(buf, &p, 10);
if(*p != '\0')
goto out;
} else {
val = 1;
}
acpi_hdr.oem_revision = cpu_to_le32(val);
if (get_param_value(buf, sizeof(buf), "asl_compiler_id", t)) {
strncpy(acpi_hdr.asl_compiler_id, buf, 4);
} else {
strncpy(acpi_hdr.asl_compiler_id, dfl_id, 4);
}
if (get_param_value(buf, sizeof(buf), "asl_compiler_rev", t)) {
val = strtol(buf, &p, 10);
if(*p != '\0')
goto out;
} else {
val = 1;
}
acpi_hdr.asl_compiler_revision = cpu_to_le32(val);
if (!get_param_value(buf, sizeof(buf), "data", t)) {
buf[0] = '\0';
}
length = sizeof(acpi_hdr);
f = buf;
while (buf[0]) {
struct stat s;
char *n = strchr(f, ':');
if (n)
*n = '\0';
if(stat(f, &s) < 0) {
fprintf(stderr, "Can't stat file '%s': %s\n", f, strerror(errno));
goto out;
}
length += s.st_size;
if (!n)
break;
*n = ':';
f = n + 1;
}
if (!acpi_tables) {
acpi_tables_len = sizeof(uint16_t);
acpi_tables = qemu_mallocz(acpi_tables_len);
}
acpi_tables = qemu_realloc(acpi_tables,
acpi_tables_len + sizeof(uint16_t) + length);
p = acpi_tables + acpi_tables_len;
acpi_tables_len += sizeof(uint16_t) + length;
*(uint16_t*)p = cpu_to_le32(length);
p += sizeof(uint16_t);
memcpy(p, &acpi_hdr, sizeof(acpi_hdr));
off = sizeof(acpi_hdr);
f = buf;
while (buf[0]) {
struct stat s;
int fd;
char *n = strchr(f, ':');
if (n)
*n = '\0';
fd = open(f, O_RDONLY);
if(fd < 0)
goto out;
if(fstat(fd, &s) < 0) {
close(fd);
goto out;
}
/* off < length is necessary because file size can be changed
under our foot */
while(s.st_size && off < length) {
int r;
r = read(fd, p + off, s.st_size);
if (r > 0) {
off += r;
s.st_size -= r;
} else if ((r < 0 && errno != EINTR) || r == 0) {
close(fd);
goto out;
}
}
close(fd);
if (!n)
break;
f = n + 1;
}
if (off < length) {
/* don't pass random value in process to guest */
memset(p + off, 0, length - off);
}
acpi_hdr_p = (struct acpi_table_header*)p;
acpi_hdr_p->length = cpu_to_le32(length);
acpi_hdr_p->checksum = acpi_checksum((uint8_t*)p, length);
/* increase number of tables */
(*(uint16_t*)acpi_tables) =
cpu_to_le32(le32_to_cpu(*(uint16_t*)acpi_tables) + 1);
return 0;
out:
if (acpi_tables) {
qemu_free(acpi_tables);
acpi_tables = NULL;
}
return -1;
}
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