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linux/drivers/acpi/tables.c
Bob Moore 793c2388ca ACPI: ACPICA 20060331 
Implemented header file support for the following
additional ACPI tables: ASF!, BOOT, CPEP, DBGP, MCFG, SPCR,
SPMI, TCPA, and WDRT. With this support, all current and
known ACPI tables are now defined in the ACPICA headers and
are available for use by device drivers and other software.

Implemented support to allow tables that contain ACPI
names with invalid characters to be loaded. Previously,
this would cause the table load to fail, but since
there are several known cases of such tables on
existing machines, this change was made to enable
ACPI support for them. Also, this matches the
behavior of the Microsoft ACPI implementation.
https://bugzilla.novell.com/show_bug.cgi?id=147621

Fixed a couple regressions introduced during the memory
optimization in the 20060317 release. The namespace
node definition required additional reorganization and
an internal datatype that had been changed to 8-bit was
restored to 32-bit. (Valery Podrezov)

Fixed a problem where a null pointer passed to
acpi_ut_delete_generic_state() could be passed through
to acpi_os_release_object which is unexpected. Such
null pointers are now trapped and ignored, matching
the behavior of the previous implementation before the
deployment of acpi_os_release_object().  (Valery Podrezov,
Fiodor Suietov)

Fixed a memory mapping leak during the deletion of
a SystemMemory operation region where a cached memory
mapping was not deleted. This became a noticeable problem
for operation regions that are defined within frequently
used control methods. (Dana Meyers)

Reorganized the ACPI table header files into two main
files: one for the ACPI tables consumed by the ACPICA core,
and another for the miscellaneous ACPI tables that are
consumed by the drivers and other software. The various
FADT definitions were merged into one common section and
three different tables (ACPI 1.0, 1.0+, and 2.0)

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2006-06-14 02:04:16 -04:00

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/*
* acpi_tables.c - ACPI Boot-Time Table Parsing
*
* Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/errno.h>
#include <linux/acpi.h>
#include <linux/bootmem.h>
#define PREFIX "ACPI: "
#define ACPI_MAX_TABLES 128
static char *acpi_table_signatures[ACPI_TABLE_COUNT] = {
[ACPI_TABLE_UNKNOWN] = "????",
[ACPI_APIC] = "APIC",
[ACPI_BOOT] = "BOOT",
[ACPI_DBGP] = "DBGP",
[ACPI_DSDT] = "DSDT",
[ACPI_ECDT] = "ECDT",
[ACPI_ETDT] = "ETDT",
[ACPI_FADT] = "FACP",
[ACPI_FACS] = "FACS",
[ACPI_OEMX] = "OEM",
[ACPI_PSDT] = "PSDT",
[ACPI_SBST] = "SBST",
[ACPI_SLIT] = "SLIT",
[ACPI_SPCR] = "SPCR",
[ACPI_SRAT] = "SRAT",
[ACPI_SSDT] = "SSDT",
[ACPI_SPMI] = "SPMI",
[ACPI_HPET] = "HPET",
[ACPI_MCFG] = "MCFG",
};
static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
/* System Description Table (RSDT/XSDT) */
struct acpi_table_sdt {
unsigned long pa;
enum acpi_table_id id;
unsigned long size;
} __attribute__ ((packed));
static unsigned long sdt_pa; /* Physical Address */
static unsigned long sdt_count; /* Table count */
static struct acpi_table_sdt sdt_entry[ACPI_MAX_TABLES] __initdata;
void acpi_table_print(struct acpi_table_header *header, unsigned long phys_addr)
{
char *name = NULL;
if (!header)
return;
/* Some table signatures aren't good table names */
if (!strncmp((char *)&header->signature,
acpi_table_signatures[ACPI_APIC],
sizeof(header->signature))) {
name = "MADT";
} else if (!strncmp((char *)&header->signature,
acpi_table_signatures[ACPI_FADT],
sizeof(header->signature))) {
name = "FADT";
} else
name = header->signature;
printk(KERN_DEBUG PREFIX
"%.4s (v%3.3d %6.6s %8.8s 0x%08x %.4s 0x%08x) @ 0x%p\n", name,
header->revision, header->oem_id, header->oem_table_id,
header->oem_revision, header->asl_compiler_id,
header->asl_compiler_revision, (void *)phys_addr);
}
void acpi_table_print_madt_entry(acpi_table_entry_header * header)
{
if (!header)
return;
switch (header->type) {
case ACPI_MADT_LAPIC:
{
struct acpi_table_lapic *p =
(struct acpi_table_lapic *)header;
printk(KERN_INFO PREFIX
"LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
p->acpi_id, p->id,
p->flags.enabled ? "enabled" : "disabled");
}
break;
case ACPI_MADT_IOAPIC:
{
struct acpi_table_ioapic *p =
(struct acpi_table_ioapic *)header;
printk(KERN_INFO PREFIX
"IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
p->id, p->address, p->global_irq_base);
}
break;
case ACPI_MADT_INT_SRC_OVR:
{
struct acpi_table_int_src_ovr *p =
(struct acpi_table_int_src_ovr *)header;
printk(KERN_INFO PREFIX
"INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
p->bus, p->bus_irq, p->global_irq,
mps_inti_flags_polarity[p->flags.polarity],
mps_inti_flags_trigger[p->flags.trigger]);
if (p->flags.reserved)
printk(KERN_INFO PREFIX
"INT_SRC_OVR unexpected reserved flags: 0x%x\n",
p->flags.reserved);
}
break;
case ACPI_MADT_NMI_SRC:
{
struct acpi_table_nmi_src *p =
(struct acpi_table_nmi_src *)header;
printk(KERN_INFO PREFIX
"NMI_SRC (%s %s global_irq %d)\n",
mps_inti_flags_polarity[p->flags.polarity],
mps_inti_flags_trigger[p->flags.trigger],
p->global_irq);
}
break;
case ACPI_MADT_LAPIC_NMI:
{
struct acpi_table_lapic_nmi *p =
(struct acpi_table_lapic_nmi *)header;
printk(KERN_INFO PREFIX
"LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
p->acpi_id,
mps_inti_flags_polarity[p->flags.polarity],
mps_inti_flags_trigger[p->flags.trigger],
p->lint);
}
break;
case ACPI_MADT_LAPIC_ADDR_OVR:
{
struct acpi_table_lapic_addr_ovr *p =
(struct acpi_table_lapic_addr_ovr *)header;
printk(KERN_INFO PREFIX
"LAPIC_ADDR_OVR (address[%p])\n",
(void *)(unsigned long)p->address);
}
break;
case ACPI_MADT_IOSAPIC:
{
struct acpi_table_iosapic *p =
(struct acpi_table_iosapic *)header;
printk(KERN_INFO PREFIX
"IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
p->id, (void *)(unsigned long)p->address,
p->global_irq_base);
}
break;
case ACPI_MADT_LSAPIC:
{
struct acpi_table_lsapic *p =
(struct acpi_table_lsapic *)header;
printk(KERN_INFO PREFIX
"LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
p->acpi_id, p->id, p->eid,
p->flags.enabled ? "enabled" : "disabled");
}
break;
case ACPI_MADT_PLAT_INT_SRC:
{
struct acpi_table_plat_int_src *p =
(struct acpi_table_plat_int_src *)header;
printk(KERN_INFO PREFIX
"PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
mps_inti_flags_polarity[p->flags.polarity],
mps_inti_flags_trigger[p->flags.trigger],
p->type, p->id, p->eid, p->iosapic_vector,
p->global_irq);
}
break;
default:
printk(KERN_WARNING PREFIX
"Found unsupported MADT entry (type = 0x%x)\n",
header->type);
break;
}
}
static int
acpi_table_compute_checksum(void *table_pointer, unsigned long length)
{
u8 *p = (u8 *) table_pointer;
unsigned long remains = length;
unsigned long sum = 0;
if (!p || !length)
return -EINVAL;
while (remains--)
sum += *p++;
return (sum & 0xFF);
}
/*
* acpi_get_table_header_early()
* for acpi_blacklisted(), acpi_table_get_sdt()
*/
int __init
acpi_get_table_header_early(enum acpi_table_id id,
struct acpi_table_header **header)
{
unsigned int i;
enum acpi_table_id temp_id;
/* DSDT is different from the rest */
if (id == ACPI_DSDT)
temp_id = ACPI_FADT;
else
temp_id = id;
/* Locate the table. */
for (i = 0; i < sdt_count; i++) {
if (sdt_entry[i].id != temp_id)
continue;
*header = (void *)
__acpi_map_table(sdt_entry[i].pa, sdt_entry[i].size);
if (!*header) {
printk(KERN_WARNING PREFIX "Unable to map %s\n",
acpi_table_signatures[temp_id]);
return -ENODEV;
}
break;
}
if (!*header) {
printk(KERN_WARNING PREFIX "%s not present\n",
acpi_table_signatures[id]);
return -ENODEV;
}
/* Map the DSDT header via the pointer in the FADT */
if (id == ACPI_DSDT) {
struct fadt_descriptor *fadt =
(struct fadt_descriptor *)*header;
if (fadt->revision == 3 && fadt->Xdsdt) {
*header = (void *)__acpi_map_table(fadt->Xdsdt,
sizeof(struct
acpi_table_header));
} else if (fadt->V1_dsdt) {
*header = (void *)__acpi_map_table(fadt->V1_dsdt,
sizeof(struct
acpi_table_header));
} else
*header = NULL;
if (!*header) {
printk(KERN_WARNING PREFIX "Unable to map DSDT\n");
return -ENODEV;
}
}
return 0;
}
int __init
acpi_table_parse_madt_family(enum acpi_table_id id,
unsigned long madt_size,
int entry_id,
acpi_madt_entry_handler handler,
unsigned int max_entries)
{
void *madt = NULL;
acpi_table_entry_header *entry;
unsigned int count = 0;
unsigned long madt_end;
unsigned int i;
if (!handler)
return -EINVAL;
/* Locate the MADT (if exists). There should only be one. */
for (i = 0; i < sdt_count; i++) {
if (sdt_entry[i].id != id)
continue;
madt = (void *)
__acpi_map_table(sdt_entry[i].pa, sdt_entry[i].size);
if (!madt) {
printk(KERN_WARNING PREFIX "Unable to map %s\n",
acpi_table_signatures[id]);
return -ENODEV;
}
break;
}
if (!madt) {
printk(KERN_WARNING PREFIX "%s not present\n",
acpi_table_signatures[id]);
return -ENODEV;
}
madt_end = (unsigned long)madt + sdt_entry[i].size;
/* Parse all entries looking for a match. */
entry = (acpi_table_entry_header *)
((unsigned long)madt + madt_size);
while (((unsigned long)entry) + sizeof(acpi_table_entry_header) <
madt_end) {
if (entry->type == entry_id
&& (!max_entries || count++ < max_entries))
if (handler(entry, madt_end))
return -EINVAL;
entry = (acpi_table_entry_header *)
((unsigned long)entry + entry->length);
}
if (max_entries && count > max_entries) {
printk(KERN_WARNING PREFIX "[%s:0x%02x] ignored %i entries of "
"%i found\n", acpi_table_signatures[id], entry_id,
count - max_entries, count);
}
return count;
}
int __init
acpi_table_parse_madt(enum acpi_madt_entry_id id,
acpi_madt_entry_handler handler, unsigned int max_entries)
{
return acpi_table_parse_madt_family(ACPI_APIC,
sizeof(struct acpi_table_madt), id,
handler, max_entries);
}
int __init acpi_table_parse(enum acpi_table_id id, acpi_table_handler handler)
{
int count = 0;
unsigned int i = 0;
if (!handler)
return -EINVAL;
for (i = 0; i < sdt_count; i++) {
if (sdt_entry[i].id != id)
continue;
count++;
if (count == 1)
handler(sdt_entry[i].pa, sdt_entry[i].size);
else
printk(KERN_WARNING PREFIX
"%d duplicate %s table ignored.\n", count,
acpi_table_signatures[id]);
}
return count;
}
static int __init acpi_table_get_sdt(struct acpi_table_rsdp *rsdp)
{
struct acpi_table_header *header = NULL;
unsigned int i, id = 0;
if (!rsdp)
return -EINVAL;
/* First check XSDT (but only on ACPI 2.0-compatible systems) */
if ((rsdp->revision >= 2) &&
(((struct acpi20_table_rsdp *)rsdp)->xsdt_address)) {
struct acpi_table_xsdt *mapped_xsdt = NULL;
sdt_pa = ((struct acpi20_table_rsdp *)rsdp)->xsdt_address;
/* map in just the header */
header = (struct acpi_table_header *)
__acpi_map_table(sdt_pa, sizeof(struct acpi_table_header));
if (!header) {
printk(KERN_WARNING PREFIX
"Unable to map XSDT header\n");
return -ENODEV;
}
/* remap in the entire table before processing */
mapped_xsdt = (struct acpi_table_xsdt *)
__acpi_map_table(sdt_pa, header->length);
if (!mapped_xsdt) {
printk(KERN_WARNING PREFIX "Unable to map XSDT\n");
return -ENODEV;
}
header = &mapped_xsdt->header;
if (strncmp(header->signature, "XSDT", 4)) {
printk(KERN_WARNING PREFIX
"XSDT signature incorrect\n");
return -ENODEV;
}
if (acpi_table_compute_checksum(header, header->length)) {
printk(KERN_WARNING PREFIX "Invalid XSDT checksum\n");
return -ENODEV;
}
sdt_count =
(header->length - sizeof(struct acpi_table_header)) >> 3;
if (sdt_count > ACPI_MAX_TABLES) {
printk(KERN_WARNING PREFIX
"Truncated %lu XSDT entries\n",
(sdt_count - ACPI_MAX_TABLES));
sdt_count = ACPI_MAX_TABLES;
}
for (i = 0; i < sdt_count; i++)
sdt_entry[i].pa = (unsigned long)mapped_xsdt->entry[i];
}
/* Then check RSDT */
else if (rsdp->rsdt_address) {
struct acpi_table_rsdt *mapped_rsdt = NULL;
sdt_pa = rsdp->rsdt_address;
/* map in just the header */
header = (struct acpi_table_header *)
__acpi_map_table(sdt_pa, sizeof(struct acpi_table_header));
if (!header) {
printk(KERN_WARNING PREFIX
"Unable to map RSDT header\n");
return -ENODEV;
}
/* remap in the entire table before processing */
mapped_rsdt = (struct acpi_table_rsdt *)
__acpi_map_table(sdt_pa, header->length);
if (!mapped_rsdt) {
printk(KERN_WARNING PREFIX "Unable to map RSDT\n");
return -ENODEV;
}
header = &mapped_rsdt->header;
if (strncmp(header->signature, "RSDT", 4)) {
printk(KERN_WARNING PREFIX
"RSDT signature incorrect\n");
return -ENODEV;
}
if (acpi_table_compute_checksum(header, header->length)) {
printk(KERN_WARNING PREFIX "Invalid RSDT checksum\n");
return -ENODEV;
}
sdt_count =
(header->length - sizeof(struct acpi_table_header)) >> 2;
if (sdt_count > ACPI_MAX_TABLES) {
printk(KERN_WARNING PREFIX
"Truncated %lu RSDT entries\n",
(sdt_count - ACPI_MAX_TABLES));
sdt_count = ACPI_MAX_TABLES;
}
for (i = 0; i < sdt_count; i++)
sdt_entry[i].pa = (unsigned long)mapped_rsdt->entry[i];
}
else {
printk(KERN_WARNING PREFIX
"No System Description Table (RSDT/XSDT) specified in RSDP\n");
return -ENODEV;
}
acpi_table_print(header, sdt_pa);
for (i = 0; i < sdt_count; i++) {
/* map in just the header */
header = (struct acpi_table_header *)
__acpi_map_table(sdt_entry[i].pa,
sizeof(struct acpi_table_header));
if (!header)
continue;
/* remap in the entire table before processing */
header = (struct acpi_table_header *)
__acpi_map_table(sdt_entry[i].pa, header->length);
if (!header)
continue;
acpi_table_print(header, sdt_entry[i].pa);
if (acpi_table_compute_checksum(header, header->length)) {
printk(KERN_WARNING " >>> ERROR: Invalid checksum\n");
continue;
}
sdt_entry[i].size = header->length;
for (id = 0; id < ACPI_TABLE_COUNT; id++) {
if (!strncmp((char *)&header->signature,
acpi_table_signatures[id],
sizeof(header->signature))) {
sdt_entry[i].id = id;
}
}
}
/*
* The DSDT is *not* in the RSDT (why not? no idea.) but we want
* to print its info, because this is what people usually blacklist
* against. Unfortunately, we don't know the phys_addr, so just
* print 0. Maybe no one will notice.
*/
if (!acpi_get_table_header_early(ACPI_DSDT, &header))
acpi_table_print(header, 0);
return 0;
}
/*
* acpi_table_init()
*
* find RSDP, find and checksum SDT/XSDT.
* checksum all tables, print SDT/XSDT
*
* result: sdt_entry[] is initialized
*/
int __init acpi_table_init(void)
{
struct acpi_table_rsdp *rsdp = NULL;
unsigned long rsdp_phys = 0;
int result = 0;
/* Locate and map the Root System Description Table (RSDP) */
rsdp_phys = acpi_find_rsdp();
if (!rsdp_phys) {
printk(KERN_ERR PREFIX "Unable to locate RSDP\n");
return -ENODEV;
}
rsdp = (struct acpi_table_rsdp *)__acpi_map_table(rsdp_phys,
sizeof(struct acpi_table_rsdp));
if (!rsdp) {
printk(KERN_WARNING PREFIX "Unable to map RSDP\n");
return -ENODEV;
}
printk(KERN_DEBUG PREFIX
"RSDP (v%3.3d %6.6s ) @ 0x%p\n",
rsdp->revision, rsdp->oem_id, (void *)rsdp_phys);
if (rsdp->revision < 2)
result =
acpi_table_compute_checksum(rsdp,
sizeof(struct acpi_table_rsdp));
else
result =
acpi_table_compute_checksum(rsdp,
((struct acpi20_table_rsdp *)
rsdp)->length);
if (result) {
printk(KERN_WARNING " >>> ERROR: Invalid checksum\n");
return -ENODEV;
}
/* Locate and map the System Description table (RSDT/XSDT) */
if (acpi_table_get_sdt(rsdp))
return -ENODEV;
return 0;
}
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