diff options
Diffstat (limited to 'drivers/acpi/tables.c')
| -rw-r--r-- | drivers/acpi/tables.c | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c new file mode 100644 index 0000000..a885295 --- /dev/null +++ b/drivers/acpi/tables.c @@ -0,0 +1,319 @@ +/* + * 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/init.h> +#include <linux/kernel.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 *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; +static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; + +static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; + +static int acpi_apic_instance __initdata; + +void acpi_table_print_madt_entry(struct acpi_subtable_header *header) +{ + if (!header) + return; + + switch (header->type) { + + case ACPI_MADT_TYPE_LOCAL_APIC: + { + struct acpi_madt_local_apic *p = + (struct acpi_madt_local_apic *)header; + printk(KERN_INFO PREFIX + "LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", + p->processor_id, p->id, + (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); + } + break; + + case ACPI_MADT_TYPE_IO_APIC: + { + struct acpi_madt_io_apic *p = + (struct acpi_madt_io_apic *)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_TYPE_INTERRUPT_OVERRIDE: + { + struct acpi_madt_interrupt_override *p = + (struct acpi_madt_interrupt_override *)header; + printk(KERN_INFO PREFIX + "INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", + p->bus, p->source_irq, p->global_irq, + mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], + mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); + if (p->inti_flags & + ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) + printk(KERN_INFO PREFIX + "INT_SRC_OVR unexpected reserved flags: 0x%x\n", + p->inti_flags & + ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); + + } + break; + + case ACPI_MADT_TYPE_NMI_SOURCE: + { + struct acpi_madt_nmi_source *p = + (struct acpi_madt_nmi_source *)header; + printk(KERN_INFO PREFIX + "NMI_SRC (%s %s global_irq %d)\n", + mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], + mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], + p->global_irq); + } + break; + + case ACPI_MADT_TYPE_LOCAL_APIC_NMI: + { + struct acpi_madt_local_apic_nmi *p = + (struct acpi_madt_local_apic_nmi *)header; + printk(KERN_INFO PREFIX + "LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", + p->processor_id, + mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], + mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], + p->lint); + } + break; + + case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: + { + struct acpi_madt_local_apic_override *p = + (struct acpi_madt_local_apic_override *)header; + printk(KERN_INFO PREFIX + "LAPIC_ADDR_OVR (address[%p])\n", + (void *)(unsigned long)p->address); + } + break; + + case ACPI_MADT_TYPE_IO_SAPIC: + { + struct acpi_madt_io_sapic *p = + (struct acpi_madt_io_sapic *)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_TYPE_LOCAL_SAPIC: + { + struct acpi_madt_local_sapic *p = + (struct acpi_madt_local_sapic *)header; + printk(KERN_INFO PREFIX + "LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", + p->processor_id, p->id, p->eid, + (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); + } + break; + + case ACPI_MADT_TYPE_INTERRUPT_SOURCE: + { + struct acpi_madt_interrupt_source *p = + (struct acpi_madt_interrupt_source *)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->inti_flags & ACPI_MADT_POLARITY_MASK], + mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], + p->type, p->id, p->eid, p->io_sapic_vector, + p->global_irq); + } + break; + + default: + printk(KERN_WARNING PREFIX + "Found unsupported MADT entry (type = 0x%x)\n", + header->type); + break; + } +} + + +int __init +acpi_table_parse_entries(char *id, + unsigned long table_size, + int entry_id, + acpi_table_entry_handler handler, + unsigned int max_entries) +{ + struct acpi_table_header *table_header = NULL; + struct acpi_subtable_header *entry; + unsigned int count = 0; + unsigned long table_end; + + if (!handler) + return -EINVAL; + + if (strncmp(id, ACPI_SIG_MADT, 4) == 0) + acpi_get_table(id, acpi_apic_instance, &table_header); + else + acpi_get_table(id, 0, &table_header); + + if (!table_header) { + printk(KERN_WARNING PREFIX "%4.4s not present\n", id); + return -ENODEV; + } + + table_end = (unsigned long)table_header + table_header->length; + + /* Parse all entries looking for a match. */ + + entry = (struct acpi_subtable_header *) + ((unsigned long)table_header + table_size); + + while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) < + table_end) { + if (entry->type == entry_id + && (!max_entries || count++ < max_entries)) + if (handler(entry, table_end)) + return -EINVAL; + + entry = (struct acpi_subtable_header *) + ((unsigned long)entry + entry->length); + } + if (max_entries && count > max_entries) { + printk(KERN_WARNING PREFIX "[%4.4s:0x%02x] ignored %i entries of " + "%i found\n", id, entry_id, count - max_entries, count); + } + + return count; +} + +int __init +acpi_table_parse_madt(enum acpi_madt_type id, + acpi_table_entry_handler handler, unsigned int max_entries) +{ + return acpi_table_parse_entries(ACPI_SIG_MADT, + sizeof(struct acpi_table_madt), id, + handler, max_entries); +} + +/** + * acpi_table_parse - find table with @id, run @handler on it + * + * @id: table id to find + * @handler: handler to run + * + * Scan the ACPI System Descriptor Table (STD) for a table matching @id, + * run @handler on it. Return 0 if table found, return on if not. + */ +int __init acpi_table_parse(char *id, acpi_table_handler handler) +{ + struct acpi_table_header *table = NULL; + + if (!handler) + return -EINVAL; + + if (strncmp(id, ACPI_SIG_MADT, 4) == 0) + acpi_get_table(id, acpi_apic_instance, &table); + else + acpi_get_table(id, 0, &table); + + if (table) { + handler(table); + return 0; + } else + return 1; +} + +/* + * The BIOS is supposed to supply a single APIC/MADT, + * but some report two. Provide a knob to use either. + * (don't you wish instance 0 and 1 were not the same?) + */ +static void __init check_multiple_madt(void) +{ + struct acpi_table_header *table = NULL; + + acpi_get_table(ACPI_SIG_MADT, 2, &table); + if (table) { + printk(KERN_WARNING PREFIX + "BIOS bug: multiple APIC/MADT found," + " using %d\n", acpi_apic_instance); + printk(KERN_WARNING PREFIX + "If \"acpi_apic_instance=%d\" works better, " + "notify linux-acpi@vger.kernel.org\n", + acpi_apic_instance ? 0 : 2); + + } else + acpi_apic_instance = 0; + + return; +} + +/* + * 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) +{ + acpi_status status; + + status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); + if (ACPI_FAILURE(status)) + return 1; + + check_multiple_madt(); + return 0; +} + +static int __init acpi_parse_apic_instance(char *str) +{ + if (!str) + return -EINVAL; + + acpi_apic_instance = simple_strtoul(str, NULL, 0); + + printk(KERN_NOTICE PREFIX "Shall use APIC/MADT table %d\n", + acpi_apic_instance); + + return 0; +} + +early_param("acpi_apic_instance", acpi_parse_apic_instance); |
