diff options
Diffstat (limited to 'drivers/acpi/tables.c')
| -rw-r--r-- | drivers/acpi/tables.c | 609 |
1 files changed, 609 insertions, 0 deletions
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c new file mode 100644 index 000000000000..fb64bd5d2e18 --- /dev/null +++ b/drivers/acpi/tables.c @@ -0,0 +1,609 @@ +/* + * 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; +} |