381 lines
10 KiB
C
Executable File
381 lines
10 KiB
C
Executable File
/*
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* acpi_tables.c - ACPI Boot-Time Table Parsing
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*
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* Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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*/
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#define pr_fmt(fmt) "ACPI: " fmt
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/smp.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/irq.h>
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#include <linux/errno.h>
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#include <linux/acpi.h>
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#include <linux/bootmem.h>
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#define ACPI_MAX_TABLES 128
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static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
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static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
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static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
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static int acpi_apic_instance __initdata;
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/*
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* Disable table checksum verification for the early stage due to the size
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* limitation of the current x86 early mapping implementation.
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*/
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static bool acpi_verify_table_checksum __initdata = false;
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void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
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{
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if (!header)
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return;
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switch (header->type) {
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case ACPI_MADT_TYPE_LOCAL_APIC:
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{
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struct acpi_madt_local_apic *p =
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(struct acpi_madt_local_apic *)header;
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pr_info("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
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p->processor_id, p->id,
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(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
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}
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break;
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case ACPI_MADT_TYPE_LOCAL_X2APIC:
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{
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struct acpi_madt_local_x2apic *p =
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(struct acpi_madt_local_x2apic *)header;
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pr_info("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
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p->local_apic_id, p->uid,
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(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
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}
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break;
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case ACPI_MADT_TYPE_IO_APIC:
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{
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struct acpi_madt_io_apic *p =
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(struct acpi_madt_io_apic *)header;
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pr_info("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
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p->id, p->address, p->global_irq_base);
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}
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break;
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case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
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{
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struct acpi_madt_interrupt_override *p =
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(struct acpi_madt_interrupt_override *)header;
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pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
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p->bus, p->source_irq, p->global_irq,
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mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
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mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
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if (p->inti_flags &
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~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
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pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
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p->inti_flags &
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~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
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}
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break;
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case ACPI_MADT_TYPE_NMI_SOURCE:
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{
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struct acpi_madt_nmi_source *p =
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(struct acpi_madt_nmi_source *)header;
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pr_info("NMI_SRC (%s %s global_irq %d)\n",
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mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
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mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
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p->global_irq);
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}
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break;
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case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
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{
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struct acpi_madt_local_apic_nmi *p =
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(struct acpi_madt_local_apic_nmi *)header;
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pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
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p->processor_id,
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mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
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mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
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p->lint);
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}
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break;
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case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
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{
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u16 polarity, trigger;
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struct acpi_madt_local_x2apic_nmi *p =
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(struct acpi_madt_local_x2apic_nmi *)header;
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polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
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trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
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pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
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p->uid,
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mps_inti_flags_polarity[polarity],
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mps_inti_flags_trigger[trigger],
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p->lint);
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}
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break;
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case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
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{
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struct acpi_madt_local_apic_override *p =
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(struct acpi_madt_local_apic_override *)header;
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pr_info("LAPIC_ADDR_OVR (address[%p])\n",
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(void *)(unsigned long)p->address);
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}
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break;
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case ACPI_MADT_TYPE_IO_SAPIC:
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{
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struct acpi_madt_io_sapic *p =
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(struct acpi_madt_io_sapic *)header;
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pr_info("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
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p->id, (void *)(unsigned long)p->address,
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p->global_irq_base);
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}
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break;
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case ACPI_MADT_TYPE_LOCAL_SAPIC:
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{
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struct acpi_madt_local_sapic *p =
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(struct acpi_madt_local_sapic *)header;
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pr_info("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
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p->processor_id, p->id, p->eid,
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(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
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}
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break;
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case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
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{
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struct acpi_madt_interrupt_source *p =
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(struct acpi_madt_interrupt_source *)header;
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pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
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mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
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mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
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p->type, p->id, p->eid, p->io_sapic_vector,
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p->global_irq);
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}
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break;
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default:
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pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
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header->type);
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break;
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}
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}
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int __init
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acpi_table_parse_entries(char *id,
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unsigned long table_size,
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int entry_id,
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acpi_tbl_entry_handler handler,
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unsigned int max_entries)
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{
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struct acpi_table_header *table_header = NULL;
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struct acpi_subtable_header *entry;
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unsigned int count = 0;
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unsigned long table_end;
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acpi_size tbl_size;
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if (acpi_disabled)
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return -ENODEV;
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if (!handler)
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return -EINVAL;
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if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
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acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size);
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else
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acpi_get_table_with_size(id, 0, &table_header, &tbl_size);
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if (!table_header) {
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pr_warn("%4.4s not present\n", id);
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return -ENODEV;
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}
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table_end = (unsigned long)table_header + table_header->length;
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/* Parse all entries looking for a match. */
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entry = (struct acpi_subtable_header *)
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((unsigned long)table_header + table_size);
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while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
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table_end) {
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if (entry->type == entry_id
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&& (!max_entries || count++ < max_entries))
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if (handler(entry, table_end))
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goto err;
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/*
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* If entry->length is 0, break from this loop to avoid
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* infinite loop.
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*/
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if (entry->length == 0) {
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pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
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goto err;
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}
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entry = (struct acpi_subtable_header *)
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((unsigned long)entry + entry->length);
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}
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if (max_entries && count > max_entries) {
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pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n",
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id, entry_id, count - max_entries, count);
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}
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early_acpi_os_unmap_memory((char *)table_header, tbl_size);
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return count;
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err:
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early_acpi_os_unmap_memory((char *)table_header, tbl_size);
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return -EINVAL;
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}
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int __init
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acpi_table_parse_madt(enum acpi_madt_type id,
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acpi_tbl_entry_handler handler, unsigned int max_entries)
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{
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return acpi_table_parse_entries(ACPI_SIG_MADT,
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sizeof(struct acpi_table_madt), id,
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handler, max_entries);
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}
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/**
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* acpi_table_parse - find table with @id, run @handler on it
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* @id: table id to find
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* @handler: handler to run
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*
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* Scan the ACPI System Descriptor Table (STD) for a table matching @id,
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* run @handler on it.
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*
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* Return 0 if table found, -errno if not.
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*/
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int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
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{
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struct acpi_table_header *table = NULL;
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acpi_size tbl_size;
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if (acpi_disabled)
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return -ENODEV;
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if (!id || !handler)
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return -EINVAL;
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if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
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acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
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else
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acpi_get_table_with_size(id, 0, &table, &tbl_size);
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if (table) {
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handler(table);
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early_acpi_os_unmap_memory(table, tbl_size);
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return 0;
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} else
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return -ENODEV;
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}
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/*
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* The BIOS is supposed to supply a single APIC/MADT,
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* but some report two. Provide a knob to use either.
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* (don't you wish instance 0 and 1 were not the same?)
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*/
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static void __init check_multiple_madt(void)
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{
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struct acpi_table_header *table = NULL;
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acpi_size tbl_size;
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acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
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if (table) {
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pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
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acpi_apic_instance);
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pr_warn("If \"acpi_apic_instance=%d\" works better, "
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"notify linux-acpi@vger.kernel.org\n",
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acpi_apic_instance ? 0 : 2);
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early_acpi_os_unmap_memory(table, tbl_size);
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} else
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acpi_apic_instance = 0;
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return;
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}
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/*
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* acpi_table_init()
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*
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* find RSDP, find and checksum SDT/XSDT.
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* checksum all tables, print SDT/XSDT
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*
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* result: sdt_entry[] is initialized
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*/
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int __init acpi_table_init(void)
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{
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acpi_status status;
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if (acpi_verify_table_checksum) {
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pr_info("Early table checksum verification enabled\n");
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acpi_gbl_verify_table_checksum = TRUE;
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} else {
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pr_info("Early table checksum verification disabled\n");
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acpi_gbl_verify_table_checksum = FALSE;
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}
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status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
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if (ACPI_FAILURE(status))
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return -EINVAL;
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check_multiple_madt();
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return 0;
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}
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static int __init acpi_parse_apic_instance(char *str)
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{
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if (!str)
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return -EINVAL;
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if (kstrtoint(str, 0, &acpi_apic_instance))
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return -EINVAL;
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pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
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return 0;
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}
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early_param("acpi_apic_instance", acpi_parse_apic_instance);
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static int __init acpi_force_table_verification_setup(char *s)
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{
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acpi_verify_table_checksum = true;
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return 0;
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}
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early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
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