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linux/drivers/acpi/tables.c

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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 256
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];
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_rev2 *fadt =
(struct fadt_descriptor_rev2 *)*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 *)__va(rsdp_phys);
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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