// SPDX-License-Identifier: GPL-2.0-or-later /* * acpi_tables.c - ACPI Boot-Time Table Parsing * * Copyright (C) 2001 Paul Diefenbaugh */ /* Uncomment next line to get verbose printout */ /* #define DEBUG */ #define pr_fmt(fmt) "ACPI: " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include "internal.h" #ifdef CONFIG_ACPI_CUSTOM_DSDT #include CONFIG_ACPI_CUSTOM_DSDT_FILE #endif #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; enum acpi_subtable_type { ACPI_SUBTABLE_COMMON, ACPI_SUBTABLE_HMAT, }; struct acpi_subtable_entry { union acpi_subtable_headers *hdr; enum acpi_subtable_type type; }; /* * 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_debug("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_debug("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_debug("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_debug("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_debug("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; case ACPI_MADT_TYPE_GENERIC_INTERRUPT: { struct acpi_madt_generic_interrupt *p = (struct acpi_madt_generic_interrupt *)header; pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", p->uid, p->base_address, p->arm_mpidr, (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); } break; case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: { struct acpi_madt_generic_distributor *p = (struct acpi_madt_generic_distributor *)header; pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", p->gic_id, p->base_address, p->global_irq_base); } break; default: pr_warn("Found unsupported MADT entry (type = 0x%x)\n", header->type); break; } } static unsigned long __init acpi_get_entry_type(struct acpi_subtable_entry *entry) { switch (entry->type) { case ACPI_SUBTABLE_COMMON: return entry->hdr->common.type; case ACPI_SUBTABLE_HMAT: return entry->hdr->hmat.type; } return 0; } static unsigned long __init acpi_get_entry_length(struct acpi_subtable_entry *entry) { switch (entry->type) { case ACPI_SUBTABLE_COMMON: return entry->hdr->common.length; case ACPI_SUBTABLE_HMAT: return entry->hdr->hmat.length; } return 0; } static unsigned long __init acpi_get_subtable_header_length(struct acpi_subtable_entry *entry) { switch (entry->type) { case ACPI_SUBTABLE_COMMON: return sizeof(entry->hdr->common); case ACPI_SUBTABLE_HMAT: return sizeof(entry->hdr->hmat); } return 0; } static enum acpi_subtable_type __init acpi_get_subtable_type(char *id) { if (strncmp(id, ACPI_SIG_HMAT, 4) == 0) return ACPI_SUBTABLE_HMAT; return ACPI_SUBTABLE_COMMON; } /** * acpi_parse_entries_array - for each proc_num find a suitable subtable * * @id: table id (for debugging purposes) * @table_size: size of the root table * @table_header: where does the table start? * @proc: array of acpi_subtable_proc struct containing entry id * and associated handler with it * @proc_num: how big proc is? * @max_entries: how many entries can we process? * * For each proc_num find a subtable with proc->id and run proc->handler * on it. Assumption is that there's only single handler for particular * entry id. * * The table_size is not the size of the complete ACPI table (the length * field in the header struct), but only the size of the root table; i.e., * the offset from the very first byte of the complete ACPI table, to the * first byte of the very first subtable. * * On success returns sum of all matching entries for all proc handlers. * Otherwise, -ENODEV or -EINVAL is returned. */ static int __init acpi_parse_entries_array(char *id, unsigned long table_size, struct acpi_table_header *table_header, struct acpi_subtable_proc *proc, int proc_num, unsigned int max_entries) { struct acpi_subtable_entry entry; unsigned long table_end, subtable_len, entry_len; int count = 0; int errs = 0; int i; if (acpi_disabled) return -ENODEV; if (!id) return -EINVAL; if (!table_size) return -EINVAL; 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.type = acpi_get_subtable_type(id); entry.hdr = (union acpi_subtable_headers *) ((unsigned long)table_header + table_size); subtable_len = acpi_get_subtable_header_length(&entry); while (((unsigned long)entry.hdr) + subtable_len < table_end) { if (max_entries && count >= max_entries) break; for (i = 0; i < proc_num; i++) { if (acpi_get_entry_type(&entry) != proc[i].id) continue; if (!proc[i].handler || (!errs && proc[i].handler(entry.hdr, table_end))) { errs++; continue; } proc[i].count++; break; } if (i != proc_num) count++; /* * If entry->length is 0, break from this loop to avoid * infinite loop. */ entry_len = acpi_get_entry_length(&entry); if (entry_len == 0) { pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id); return -EINVAL; } entry.hdr = (union acpi_subtable_headers *) ((unsigned long)entry.hdr + entry_len); } if (max_entries && count > max_entries) { pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n", id, proc->id, count); } return errs ? -EINVAL : count; } int __init acpi_table_parse_entries_array(char *id, unsigned long table_size, struct acpi_subtable_proc *proc, int proc_num, unsigned int max_entries) { struct acpi_table_header *table_header = NULL; int count; u32 instance = 0; if (acpi_disabled) return -ENODEV; if (!id) return -EINVAL; if (!strncmp(id, ACPI_SIG_MADT, 4)) instance = acpi_apic_instance; acpi_get_table(id, instance, &table_header); if (!table_header) { pr_warn("%4.4s not present\n", id); return -ENODEV; } count = acpi_parse_entries_array(id, table_size, table_header, proc, proc_num, max_entries); acpi_put_table(table_header); return count; } 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_subtable_proc proc = { .id = entry_id, .handler = handler, }; return acpi_table_parse_entries_array(id, table_size, &proc, 1, max_entries); } 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; if (acpi_disabled) return -ENODEV; if (!id || !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); acpi_put_table(table); 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_get_table(ACPI_SIG_MADT, 2, &table); 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); acpi_put_table(table); } else acpi_apic_instance = 0; return; } static void acpi_table_taint(struct acpi_table_header *table) { pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", table->signature, table->oem_table_id); add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); } #ifdef CONFIG_ACPI_TABLE_UPGRADE static u64 acpi_tables_addr; static int all_tables_size; /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ static u8 __init acpi_table_checksum(u8 *buffer, u32 length) { u8 sum = 0; u8 *end = buffer + length; while (buffer < end) sum = (u8) (sum + *(buffer++)); return sum; } /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ static const char * const table_sigs[] = { ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, ACPI_SIG_NHLT, NULL }; #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) #define NR_ACPI_INITRD_TABLES 64 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) void __init acpi_table_upgrade(void) { void *data; size_t size; int sig, no, table_nr = 0, total_offset = 0; long offset = 0; struct acpi_table_header *table; char cpio_path[32] = "kernel/firmware/acpi/"; struct cpio_data file; if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) { data = __initramfs_start; size = __initramfs_size; } else { data = (void *)initrd_start; size = initrd_end - initrd_start; } if (data == NULL || size == 0) return; for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { file = find_cpio_data(cpio_path, data, size, &offset); if (!file.data) break; data += offset; size -= offset; if (file.size < sizeof(struct acpi_table_header)) { pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", cpio_path, file.name); continue; } table = file.data; for (sig = 0; table_sigs[sig]; sig++) if (!memcmp(table->signature, table_sigs[sig], 4)) break; if (!table_sigs[sig]) { pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", cpio_path, file.name); continue; } if (file.size != table->length) { pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", cpio_path, file.name); continue; } if (acpi_table_checksum(file.data, table->length)) { pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", cpio_path, file.name); continue; } pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", table->signature, cpio_path, file.name, table->length); all_tables_size += table->length; acpi_initrd_files[table_nr].data = file.data; acpi_initrd_files[table_nr].size = file.size; table_nr++; } if (table_nr == 0) return; if (security_locked_down(LOCKDOWN_ACPI_TABLES)) { pr_notice("kernel is locked down, ignoring table override\n"); return; } acpi_tables_addr = memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS, all_tables_size, PAGE_SIZE); if (!acpi_tables_addr) { WARN_ON(1); return; } /* * Only calling e820_add_reserve does not work and the * tables are invalid (memory got used) later. * memblock_reserve works as expected and the tables won't get modified. * But it's not enough on X86 because ioremap will * complain later (used by acpi_os_map_memory) that the pages * that should get mapped are not marked "reserved". * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) * works fine. */ memblock_reserve(acpi_tables_addr, all_tables_size); arch_reserve_mem_area(acpi_tables_addr, all_tables_size); /* * early_ioremap only can remap 256k one time. If we map all * tables one time, we will hit the limit. Need to map chunks * one by one during copying the same as that in relocate_initrd(). */ for (no = 0; no < table_nr; no++) { unsigned char *src_p = acpi_initrd_files[no].data; phys_addr_t size = acpi_initrd_files[no].size; phys_addr_t dest_addr = acpi_tables_addr + total_offset; phys_addr_t slop, clen; char *dest_p; total_offset += size; while (size) { slop = dest_addr & ~PAGE_MASK; clen = size; if (clen > MAP_CHUNK_SIZE - slop) clen = MAP_CHUNK_SIZE - slop; dest_p = early_memremap(dest_addr & PAGE_MASK, clen + slop); memcpy(dest_p + slop, src_p, clen); early_memunmap(dest_p, clen + slop); src_p += clen; dest_addr += clen; size -= clen; } } } static acpi_status acpi_table_initrd_override(struct acpi_table_header *existing_table, acpi_physical_address *address, u32 *length) { int table_offset = 0; int table_index = 0; struct acpi_table_header *table; u32 table_length; *length = 0; *address = 0; if (!acpi_tables_addr) return AE_OK; while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { table = acpi_os_map_memory(acpi_tables_addr + table_offset, ACPI_HEADER_SIZE); if (table_offset + table->length > all_tables_size) { acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); WARN_ON(1); return AE_OK; } table_length = table->length; /* Only override tables matched */ if (memcmp(existing_table->signature, table->signature, 4) || memcmp(table->oem_id, existing_table->oem_id, ACPI_OEM_ID_SIZE) || memcmp(table->oem_table_id, existing_table->oem_table_id, ACPI_OEM_TABLE_ID_SIZE)) { acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); goto next_table; } /* * Mark the table to avoid being used in * acpi_table_initrd_scan() and check the revision. */ if (test_and_set_bit(table_index, acpi_initrd_installed) || existing_table->oem_revision >= table->oem_revision) { acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); goto next_table; } *length = table_length; *address = acpi_tables_addr + table_offset; pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", table->signature, table->oem_id, table->oem_table_id); acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); break; next_table: table_offset += table_length; table_index++; } return AE_OK; } static void __init acpi_table_initrd_scan(void) { int table_offset = 0; int table_index = 0; u32 table_length; struct acpi_table_header *table; if (!acpi_tables_addr) return; while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { table = acpi_os_map_memory(acpi_tables_addr + table_offset, ACPI_HEADER_SIZE); if (table_offset + table->length > all_tables_size) { acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); WARN_ON(1); return; } table_length = table->length; /* Skip RSDT/XSDT which should only be used for override */ if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) || ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) { acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); goto next_table; } /* * Mark the table to avoid being used in * acpi_table_initrd_override(). Though this is not possible * because override is disabled in acpi_install_table(). */ if (test_and_set_bit(table_index, acpi_initrd_installed)) { acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); goto next_table; } pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", table->signature, table->oem_id, table->oem_table_id); acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); acpi_install_table(acpi_tables_addr + table_offset, TRUE); next_table: table_offset += table_length; table_index++; } } #else static acpi_status acpi_table_initrd_override(struct acpi_table_header *existing_table, acpi_physical_address *address, u32 *table_length) { *table_length = 0; *address = 0; return AE_OK; } static void __init acpi_table_initrd_scan(void) { } #endif /* CONFIG_ACPI_TABLE_UPGRADE */ acpi_status acpi_os_physical_table_override(struct acpi_table_header *existing_table, acpi_physical_address *address, u32 *table_length) { return acpi_table_initrd_override(existing_table, address, table_length); } #ifdef CONFIG_ACPI_CUSTOM_DSDT static void *amlcode __attribute__ ((weakref("AmlCode"))); static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code"))); #endif acpi_status acpi_os_table_override(struct acpi_table_header *existing_table, struct acpi_table_header **new_table) { if (!existing_table || !new_table) return AE_BAD_PARAMETER; *new_table = NULL; #ifdef CONFIG_ACPI_CUSTOM_DSDT if (!strncmp(existing_table->signature, "DSDT", 4)) { *new_table = (struct acpi_table_header *)&amlcode; if (!(*new_table)) *new_table = (struct acpi_table_header *)&dsdt_amlcode; } #endif if (*new_table != NULL) acpi_table_taint(existing_table); return AE_OK; } /* * 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_enable_table_validation = TRUE; } else { pr_info("Early table checksum verification disabled\n"); acpi_gbl_enable_table_validation = FALSE; } status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); if (ACPI_FAILURE(status)) return -EINVAL; acpi_table_initrd_scan(); 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); static int __init acpi_force_32bit_fadt_addr(char *s) { pr_info("Forcing 32 Bit FADT addresses\n"); acpi_gbl_use32_bit_fadt_addresses = TRUE; return 0; } early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);