/* * 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 * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * */ #define pr_fmt(fmt) "ACPI: " fmt #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 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; /* * Disable table checksum verification for the early stage due to the size * limitation of the current x86 early mapping implementation. */ static bool acpi_verify_table_checksum __initdata = false; 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; pr_info("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_LOCAL_X2APIC: { struct acpi_madt_local_x2apic *p = (struct acpi_madt_local_x2apic *)header; pr_info("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", p->local_apic_id, p->uid, (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; pr_info("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; pr_info("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)) pr_info("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; pr_info("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; pr_info("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_X2APIC_NMI: { u16 polarity, trigger; struct acpi_madt_local_x2apic_nmi *p = (struct acpi_madt_local_x2apic_nmi *)header; polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", p->uid, mps_inti_flags_polarity[polarity], mps_inti_flags_trigger[trigger], p->lint); } break; case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: { struct acpi_madt_local_apic_override *p = (struct acpi_madt_local_apic_override *)header; pr_info("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; pr_info("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; pr_info("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; 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", 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: pr_warn("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_tbl_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; acpi_size tbl_size; if (acpi_disabled) return -ENODEV; if (!handler) return -EINVAL; if (strncmp(id, ACPI_SIG_MADT, 4) == 0) acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size); else acpi_get_table_with_size(id, 0, &table_header, &tbl_size); if (!table_header) { pr_warn("%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)) goto err; /* * If entry->length is 0, break from this loop to avoid * infinite loop. */ if (entry->length == 0) { pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id); goto err; } entry = (struct acpi_subtable_header *) ((unsigned long)entry + entry->length); } if (max_entries && count > max_entries) { pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n", id, entry_id, count - max_entries, count); } early_acpi_os_unmap_memory((char *)table_header, tbl_size); return count; err: early_acpi_os_unmap_memory((char *)table_header, tbl_size); return -EINVAL; } int __init acpi_table_parse_madt(enum acpi_madt_type id, acpi_tbl_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, -errno if not. */ int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) { struct acpi_table_header *table = NULL; acpi_size tbl_size; if (acpi_disabled) return -ENODEV; if (!id || !handler) return -EINVAL; if (strncmp(id, ACPI_SIG_MADT, 4) == 0) acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size); else acpi_get_table_with_size(id, 0, &table, &tbl_size); if (table) { handler(table); early_acpi_os_unmap_memory(table, tbl_size); return 0; } else return -ENODEV; } /* * 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_size tbl_size; acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size); if (table) { pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", acpi_apic_instance); pr_warn("If \"acpi_apic_instance=%d\" works better, " "notify linux-acpi@vger.kernel.org\n", acpi_apic_instance ? 0 : 2); early_acpi_os_unmap_memory(table, tbl_size); } 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; if (acpi_verify_table_checksum) { pr_info("Early table checksum verification enabled\n"); acpi_gbl_verify_table_checksum = TRUE; } else { pr_info("Early table checksum verification disabled\n"); acpi_gbl_verify_table_checksum = FALSE; } status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); if (ACPI_FAILURE(status)) return -EINVAL; check_multiple_madt(); return 0; } static int __init acpi_parse_apic_instance(char *str) { if (!str) return -EINVAL; if (kstrtoint(str, 0, &acpi_apic_instance)) return -EINVAL; pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); return 0; } early_param("acpi_apic_instance", acpi_parse_apic_instance); static int __init acpi_force_table_verification_setup(char *s) { acpi_verify_table_checksum = true; return 0; } early_param("acpi_force_table_verification", acpi_force_table_verification_setup);