blob: 2ac82821e7f93a9bf3c755484381392c806038cd [file] [log] [blame]
// Support for parsing dsdt acpi tables
//
// Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "config.h" // CONFIG_*
#include "list.h" // hlist_*
#include "malloc.h" // malloc_*
#include "output.h" // dprintf
#include "string.h" // memcpy
#include "util.h"
#include "std/acpi.h" // struct rsdp_descriptor
/****************************************************************
* DSDT parser
****************************************************************/
struct acpi_device {
struct hlist_node node;
char name[16];
u8 *hid_aml;
u8 *sta_aml;
u8 *crs_data;
int crs_size;
};
static struct hlist_head acpi_devices VARVERIFY32INIT;
static const int parse_dumpdevs = 0;
struct parse_state {
char name[32];
struct acpi_device *dev;
int error;
int depth;
};
static void parse_termlist(struct parse_state *s,
u8 *ptr, int offset, int pkglength);
static void hex(const u8 *ptr, int count, int lvl, const char *item)
{
int l = 0, i;
do {
dprintf(lvl, "%s: %04x: ", item, l);
for (i = l; i < l+16; i += 4)
dprintf(lvl, "%02x %02x %02x %02x ",
ptr[i+0], ptr[i+1], ptr[i+2], ptr[i+3]);
for (i = l; i < l+16; i++)
dprintf(lvl, "%c", (ptr[i] > 0x20 && ptr[i] < 0x80)
? ptr[i] : '.');
dprintf(lvl, "\n");
l += 16;
} while (l < count);
}
static u64 parse_resource_int(u8 *ptr, int count)
{
u64 value = 0;
int index = 0;
for (index = 0; index < count; index++)
value |= (u64)ptr[index] << (index * 8);
return value;
}
static int parse_resource_bit(u8 *ptr, int count)
{
int bit;
for (bit = 0; bit < count*8; bit++)
if (ptr[bit/8] & (1 << (bit%8)))
return bit;
return 0;
}
static int parse_resource(u8 *ptr, int length, int *type, u64 *min, u64 *max)
{
int rname, rsize;
u64 len;
*type = -1;
*min = 0;
*max = 0;
len = 0;
if (!(ptr[0] & 0x80)) {
/* small resource */
rname = (ptr[0] >> 3) & 0x0f;
rsize = ptr[0] & 0x07;
rsize++;
switch (rname) {
case 0x04: /* irq */
*min = parse_resource_bit(ptr + 1, rsize);
*max = *min;
*type = 3;
break;
case 0x0f: /* end marker */
return 0;
case 0x08: /* io */
*min = parse_resource_int(ptr + 2, 2);
*max = parse_resource_int(ptr + 4, 2);
if (*min == *max) {
*max = *min + ptr[7] - 1;
*type = 1;
}
break;
case 0x09: /* fixed io */
*min = parse_resource_int(ptr + 2, 2);
*max = *min + ptr[4] - 1;
*type = 1;
break;
default:
dprintf(3, "%s: small: 0x%x (len %d)\n",
__func__, rname, rsize);
break;
}
} else {
/* large resource */
rname = ptr[0] & 0x7f;
rsize = ptr[2] << 8 | ptr[1];
rsize += 3;
switch (rname) {
case 0x06: /* 32-bit Fixed Location Memory Range Descriptor */
*min = parse_resource_int(ptr + 4, 4);
len = parse_resource_int(ptr + 8, 4);
*max = *min + len - 1;
*type = 0;
break;
case 0x07: /* DWORD Address Space Descriptor */
*min = parse_resource_int(ptr + 10, 4);
*max = parse_resource_int(ptr + 14, 4);
*type = ptr[3];
break;
case 0x08: /* WORD Address Space Descriptor */
*min = parse_resource_int(ptr + 8, 2);
*max = parse_resource_int(ptr + 10, 2);
*type = ptr[3];
break;
case 0x09: /* irq */
*min = parse_resource_int(ptr + 5, 4);
*max = *min;
*type = 3;
break;
case 0x0a: /* QWORD Address Space Descriptor */
*min = parse_resource_int(ptr + 14, 8);
*max = parse_resource_int(ptr + 22, 8);
*type = ptr[3];
break;
default:
dprintf(3, "%s: large: 0x%x (len %d)\n", __func__, rname, rsize);
break;
}
}
return rsize;
}
static int find_resource(u8 *ptr, int len, int kind, u64 *min, u64 *max)
{
int type, size, offset = 0;
do {
size = parse_resource(ptr + offset, len - offset,
&type, min, max);
if (kind == type)
return 0;
offset += size;
} while (size > 0 && offset < len);
return -1;
}
static int print_resources(const char *prefix, u8 *ptr, int len)
{
static const char *typename[] = { "mem", "i/o", "bus" };
int type, size, offset = 0;
u64 min, max;
do {
size = parse_resource(ptr + offset, len - offset,
&type, &min, &max);
switch (type) {
case 0:
case 1:
case 2:
dprintf(1, "%s%s 0x%llx -> 0x%llx\n",
prefix, typename[type], min, max);
break;
case 3:
dprintf(1, "%sirq %lld\n", prefix, min);
break;
}
offset += size;
} while (size > 0 && offset < len);
return -1;
}
static int parse_nameseg(u8 *ptr, char **dst)
{
if (dst && *dst) {
*(dst[0]++) = ptr[0];
if (ptr[1] != '_')
*(dst[0]++) = ptr[1];
if (ptr[2] != '_')
*(dst[0]++) = ptr[2];
if (ptr[3] != '_')
*(dst[0]++) = ptr[3];
*(dst[0]) = 0;
}
return 4;
}
static int parse_namestring(struct parse_state *s,
u8 *ptr, const char *item)
{
char *dst = s->name;
int offset = 0;
int i, count;
for (;;) {
switch (ptr[offset]) {
case 0: /* null name */
offset++;
*(dst++) = 0;
break;
case 0x2e:
offset++;
offset += parse_nameseg(ptr + offset, &dst);
*(dst++) = '.';
offset += parse_nameseg(ptr + offset, &dst);
break;
case 0x2f:
offset++;
count = ptr[offset];
offset++;
for (i = 0; i < count; i++) {
if (i)
*(dst++) = '.';
offset += parse_nameseg(ptr + offset, &dst);
}
break;
case '\\':
*(dst++) = '\\';
offset++;
continue;
case '^':
*(dst++) = '^';
offset++;
continue;
case 'A' ... 'Z':
case '_':
offset += parse_nameseg(ptr, &dst);
break;
default:
hex(ptr, 16, 3, __func__);
s->error = 1;
break;
}
break;
}
dprintf(5, "%s: %d %s '%s'\n", __func__, s->depth,
item, s->name);
return offset;
}
static int parse_termarg_int(u8 *ptr, int *error, u64 *dst)
{
u64 value;
int offset = 1;
switch (ptr[0]) {
case 0x00: /* zero */
value = 0;
break;
case 0x01: /* one */
value = 1;
break;
case 0x0a: /* byte prefix */
value = ptr[1];
offset++;
break;
case 0x0b: /* word prefix */
value = ptr[1] |
((unsigned long)ptr[2] << 8);
offset += 2;
break;
case 0x0c: /* dword prefix */
value = ptr[1] |
((unsigned long)ptr[2] << 8) |
((unsigned long)ptr[3] << 16) |
((unsigned long)ptr[4] << 24);
offset += 4;
break;
default:
value = 0;
hex(ptr, 16, 3, __func__);
if (error)
*error = 1;
break;
}
if (dst)
*dst = value;
dprintf(5, "%s: 0x%llx\n", __func__, value);
return offset;
}
static int parse_pkglength(u8 *ptr, int *pkglength)
{
int offset = 2;
*pkglength = 0;
switch (ptr[0] >> 6) {
case 3:
*pkglength |= ptr[3] << 20;
offset++;
case 2:
*pkglength |= ptr[2] << 12;
offset++;
case 1:
*pkglength |= ptr[1] << 4;
*pkglength |= ptr[0] & 0x0f;
return offset;
case 0:
default:
*pkglength |= ptr[0] & 0x3f;
return 1;
}
}
static int parse_pkg_common(struct parse_state *s,
u8 *ptr, const char *item, int *pkglength)
{
int offset;
offset = parse_pkglength(ptr, pkglength);
offset += parse_namestring(s, ptr + offset, item);
return offset;
}
static int parse_pkg_scope(struct parse_state *s,
u8 *ptr)
{
int offset, pkglength;
offset = parse_pkg_common(s, ptr, "scope", &pkglength);
parse_termlist(s, ptr, offset, pkglength);
return pkglength;
}
static int parse_pkg_device(struct parse_state *s,
u8 *ptr)
{
int offset, pkglength;
offset = parse_pkg_common(s, ptr, "device", &pkglength);
s->dev = malloc_tmp(sizeof(struct acpi_device));
if (!s->dev) {
warn_noalloc();
s->error = 1;
return pkglength;
}
memset(s->dev, 0, sizeof(struct acpi_device));
hlist_add_head(&s->dev->node, &acpi_devices);
strtcpy(s->dev->name, s->name, sizeof(s->name));
parse_termlist(s, ptr, offset, pkglength);
s->dev = NULL;
return pkglength;
}
static int parse_pkg_buffer(struct parse_state *s,
u8 *ptr)
{
u64 blen;
int pkglength, offset;
offset = parse_pkglength(ptr, &pkglength);
offset += parse_termarg_int(ptr + offset, &s->error, &blen);
if (s->dev && strcmp(s->name, "_CRS") == 0) {
s->dev->crs_data = ptr + offset;
s->dev->crs_size = blen;
}
return pkglength;
}
static int parse_pkg_skip(struct parse_state *s,
u8 *ptr, int op, int name)
{
int pkglength, offset;
char item[8];
snprintf(item, sizeof(item), "op %x", op);
offset = parse_pkglength(ptr, &pkglength);
if (name) {
parse_namestring(s, ptr + offset, item);
} else {
dprintf(5, "%s: %s (%d)\n", __func__, item, pkglength);
}
return pkglength;
}
static int parse_termobj(struct parse_state *s,
u8 *ptr)
{
int offset = 1;
if (s->depth == 16) {
dprintf(1, "%s: deep recursion\n", __func__);
s->error = 1;
return offset;
}
s->depth++;
switch (ptr[0]) {
case 0x00: /* zero */
break;
case 0x01: /* one */
break;
case 0x06: /* AliasOp */
offset += parse_namestring(s, ptr + offset, "SourceObject");
offset += parse_namestring(s, ptr + offset, "AliasObject");
break;
case 0x08: /* name op */
offset += parse_namestring(s, ptr + offset, "name");
offset += parse_termobj(s, ptr + offset);
if (s->dev && strcmp(s->name, "_HID") == 0)
s->dev->hid_aml = ptr;
if (s->dev && strcmp(s->name, "_STA") == 0)
s->dev->sta_aml = ptr;
break;
case 0x0a: /* byte prefix */
offset++;
break;
case 0x0b: /* word prefix */
offset += 2;
break;
case 0x0c: /* dword prefix */
offset += 4;
break;
case 0x0d: /* string prefix */
while (ptr[offset])
offset++;
offset++;
break;
case 0x10: /* scope op */
offset += parse_pkg_scope(s, ptr + offset);
break;
case 0x11: /* buffer op */
offset += parse_pkg_buffer(s, ptr + offset);
break;
case 0x12: /* package op */
case 0x13: /* var package op */
offset += parse_pkg_skip(s, ptr + offset, ptr[0], 0);
break;
case 0x14: /* method op */
offset += parse_pkg_skip(s, ptr + offset, ptr[0], 1);
if (s->dev && strcmp(s->name, "_STA") == 0)
s->dev->sta_aml = ptr;
break;
case 0x5b: /* ext op prefix */
offset++;
switch (ptr[1]) {
case 0x01: /* mutex op */
offset += parse_namestring(s, ptr + offset, "mutex");
offset++; /* sync flags */
break;
case 0x80: /* op region op */
offset += parse_namestring(s, ptr + offset, "op region");
offset++; /* region space */
offset += parse_termarg_int(ptr + offset, &s->error, NULL);
offset += parse_termarg_int(ptr + offset, &s->error, NULL);
break;
case 0x81: /* field op */
case 0x83: /* processor op */
case 0x84: /* power resource op */
case 0x85: /* thermal zone op */
offset += parse_pkg_skip(s, ptr + offset, 0x5b00 | ptr[1], 1);
break;
case 0x82: /* device op */
offset += parse_pkg_device(s, ptr + offset);
break;
default:
hex(ptr, 16, 3, __func__);
s->error = 1;
break;
}
break;
default:
hex(ptr, 16, 3, __func__);
s->error = 1;
break;
}
s->depth--;
return offset;
}
static void parse_termlist(struct parse_state *s,
u8 *ptr, int offset, int pkglength)
{
for (;;) {
offset += parse_termobj(s, ptr + offset);
if (offset == pkglength)
return;
if (offset > pkglength) {
dprintf(1, "%s: overrun: %d/%d\n", __func__,
offset, pkglength);
s->error = 1;
return;
}
if (s->error) {
dprintf(1, "%s: parse error, skip from %d/%d\n", __func__,
offset, pkglength);
s->error = 0;
return;
}
}
}
static struct acpi_device *acpi_dsdt_find(struct acpi_device *prev,
const u8 *aml1, int size1,
const u8 *aml2, int size2)
{
struct acpi_device *dev;
struct hlist_node *node;
if (!prev)
node = acpi_devices.first;
else
node = prev->node.next;
for (; node != NULL; node = dev->node.next) {
dev = container_of(node, struct acpi_device, node);
if (!aml1 && !aml2)
return dev;
if (!dev->hid_aml)
continue;
if (aml1 && memcmp(dev->hid_aml + 5, aml1, size1) == 0)
return dev;
if (aml2 && memcmp(dev->hid_aml + 5, aml2, size2) == 0)
return dev;
}
return NULL;
}
static int acpi_dsdt_present(struct acpi_device *dev)
{
if (!dev)
return 0; /* no */
if (!dev->sta_aml)
return 1; /* yes */
if (dev->sta_aml[0] == 0x14)
return -1; /* unknown (can't evaluate method) */
if (dev->sta_aml[0] == 0x08) {
u64 value = 0;
parse_termarg_int(dev->sta_aml + 5, NULL, &value);
if (value == 0)
return 0; /* no */
else
return 1; /* yes */
}
return -1; /* unknown (should not happen) */
}
/****************************************************************
* DSDT parser, public interface
****************************************************************/
struct acpi_device *acpi_dsdt_find_string(struct acpi_device *prev,
const char *hid)
{
if (!CONFIG_ACPI_PARSE)
return NULL;
u8 aml[10];
int len = snprintf((char*)aml, sizeof(aml), "\x0d%s", hid);
return acpi_dsdt_find(prev, aml, len, NULL, 0);
}
struct acpi_device *acpi_dsdt_find_eisaid(struct acpi_device *prev, u16 eisaid)
{
if (!CONFIG_ACPI_PARSE)
return NULL;
u8 aml1[] = {
0x0c, 0x41, 0xd0,
eisaid >> 8,
eisaid & 0xff
};
u8 aml2[10];
int len2 = snprintf((char*)aml2, sizeof(aml2), "\x0dPNP%04X", eisaid);
return acpi_dsdt_find(prev, aml1, 5, aml2, len2);
}
char *acpi_dsdt_name(struct acpi_device *dev)
{
if (!CONFIG_ACPI_PARSE || !dev)
return NULL;
return dev->name;
}
int acpi_dsdt_find_io(struct acpi_device *dev, u64 *min, u64 *max)
{
if (!CONFIG_ACPI_PARSE || !dev || !dev->crs_data)
return -1;
return find_resource(dev->crs_data, dev->crs_size,
1 /* I/O */, min, max);
}
int acpi_dsdt_find_mem(struct acpi_device *dev, u64 *min, u64 *max)
{
if (!CONFIG_ACPI_PARSE || !dev || !dev->crs_data)
return -1;
return find_resource(dev->crs_data, dev->crs_size,
0 /* mem */, min, max);
}
int acpi_dsdt_find_irq(struct acpi_device *dev, u64 *irq)
{
u64 max;
if (!CONFIG_ACPI_PARSE || !dev || !dev->crs_data)
return -1;
return find_resource(dev->crs_data, dev->crs_size,
3 /* irq */, irq, &max);
}
int acpi_dsdt_present_eisaid(u16 eisaid)
{
if (!CONFIG_ACPI_PARSE)
return -1; /* unknown */
if (hlist_empty(&acpi_devices))
return -1; /* unknown (no dsdt table) */
struct acpi_device *dev = acpi_dsdt_find_eisaid(NULL, eisaid);
return acpi_dsdt_present(dev);
}
void acpi_dsdt_parse(void)
{
if (!CONFIG_ACPI_PARSE)
return;
struct fadt_descriptor_rev1 *fadt = find_acpi_table(FACP_SIGNATURE);
if (!fadt)
return;
u8 *dsdt = (void*)(fadt->dsdt);
if (!dsdt)
return;
u32 length = *(u32*)(dsdt + 4);
u32 offset = 0x24;
dprintf(1, "ACPI: parse DSDT at %p (len %d)\n", dsdt, length);
struct parse_state s;
memset(&s, 0, sizeof(s));
parse_termlist(&s, dsdt, offset, length);
if (!parse_dumpdevs)
return;
struct acpi_device *dev;
dprintf(1, "ACPI: dumping dsdt devices\n");
for (dev = acpi_dsdt_find(NULL, NULL, 0, NULL, 0);
dev != NULL;
dev = acpi_dsdt_find(dev, NULL, 0, NULL, 0)) {
dprintf(1, " %s", acpi_dsdt_name(dev));
if (dev->hid_aml)
dprintf(1, ", hid");
if (dev->sta_aml)
dprintf(1, ", sta (0x%x)", dev->sta_aml[0]);
if (dev->crs_data)
dprintf(1, ", crs");
dprintf(1, "\n");
if (dev->crs_data)
print_resources(" ", dev->crs_data, dev->crs_size);
}
}