/* * boot.c - Architecture-Specific Low-Level ACPI Boot Support * * Copyright (C) 2001, 2002 Paul Diefenbaugh * Copyright (C) 2001 Jun Nakajima * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */ static int __initdata acpi_force = 0; int acpi_disabled; EXPORT_SYMBOL(acpi_disabled); #ifdef CONFIG_X86_64 # include #endif /* X86 */ #define PREFIX "ACPI: " int acpi_noirq; /* skip ACPI IRQ initialization */ int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */ EXPORT_SYMBOL(acpi_pci_disabled); int acpi_lapic; int acpi_ioapic; int acpi_strict; int acpi_disable_cmcff; u8 acpi_sci_flags __initdata; int acpi_sci_override_gsi __initdata; int acpi_skip_timer_override __initdata; int acpi_use_timer_override __initdata; int acpi_fix_pin2_polarity __initdata; #ifdef CONFIG_X86_LOCAL_APIC static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE; #endif #ifdef CONFIG_X86_IO_APIC /* * Locks related to IOAPIC hotplug * Hotplug side: * ->device_hotplug_lock * ->acpi_ioapic_lock * ->ioapic_lock * Interrupt mapping side: * ->acpi_ioapic_lock * ->ioapic_mutex * ->ioapic_lock */ static DEFINE_MUTEX(acpi_ioapic_lock); #endif /* -------------------------------------------------------------------------- Boot-time Configuration -------------------------------------------------------------------------- */ /* * The default interrupt routing model is PIC (8259). This gets * overridden if IOAPICs are enumerated (below). */ enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC; /* * ISA irqs by default are the first 16 gsis but can be * any gsi as specified by an interrupt source override. */ static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }; #define ACPI_INVALID_GSI INT_MIN /* * This is just a simple wrapper around early_memremap(), * with sanity checks for phys == 0 and size == 0. */ char *__init __acpi_map_table(unsigned long phys, unsigned long size) { if (!phys || !size) return NULL; return early_memremap(phys, size); } void __init __acpi_unmap_table(char *map, unsigned long size) { if (!map || !size) return; early_memunmap(map, size); } #ifdef CONFIG_X86_LOCAL_APIC static int __init acpi_parse_madt(struct acpi_table_header *table) { struct acpi_table_madt *madt = NULL; if (!boot_cpu_has(X86_FEATURE_APIC)) return -EINVAL; madt = (struct acpi_table_madt *)table; if (!madt) { printk(KERN_WARNING PREFIX "Unable to map MADT\n"); return -ENODEV; } if (madt->address) { acpi_lapic_addr = (u64) madt->address; printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n", madt->address); } default_acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id); return 0; } /** * acpi_register_lapic - register a local apic and generates a logic cpu number * @id: local apic id to register * @acpiid: ACPI id to register * @enabled: this cpu is enabled or not * * Returns the logic cpu number which maps to the local apic */ static int acpi_register_lapic(int id, u32 acpiid, u8 enabled) { unsigned int ver = 0; int cpu; if (id >= MAX_LOCAL_APIC) { printk(KERN_INFO PREFIX "skipped apicid that is too big\n"); return -EINVAL; } if (!enabled) { ++disabled_cpus; return -EINVAL; } if (boot_cpu_physical_apicid != -1U) ver = boot_cpu_apic_version; cpu = generic_processor_info(id, ver); if (cpu >= 0) early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid; return cpu; } static int __init acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end) { struct acpi_madt_local_x2apic *processor = NULL; int apic_id; u8 enabled; processor = (struct acpi_madt_local_x2apic *)header; if (BAD_MADT_ENTRY(processor, end)) return -EINVAL; acpi_table_print_madt_entry(header); apic_id = processor->local_apic_id; enabled = processor->lapic_flags & ACPI_MADT_ENABLED; #ifdef CONFIG_X86_X2APIC /* * We need to register disabled CPU as well to permit * counting disabled CPUs. This allows us to size * cpus_possible_map more accurately, to permit * to not preallocating memory for all NR_CPUS * when we use CPU hotplug. */ if (!apic->apic_id_valid(apic_id) && enabled) printk(KERN_WARNING PREFIX "x2apic entry ignored\n"); else acpi_register_lapic(apic_id, processor->uid, enabled); #else printk(KERN_WARNING PREFIX "x2apic entry ignored\n"); #endif return 0; } static int __init acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end) { struct acpi_madt_local_apic *processor = NULL; processor = (struct acpi_madt_local_apic *)header; if (BAD_MADT_ENTRY(processor, end)) return -EINVAL; acpi_table_print_madt_entry(header); /* Ignore invalid ID */ if (processor->id == 0xff) return 0; /* * We need to register disabled CPU as well to permit * counting disabled CPUs. This allows us to size * cpus_possible_map more accurately, to permit * to not preallocating memory for all NR_CPUS * when we use CPU hotplug. */ acpi_register_lapic(processor->id, /* APIC ID */ processor->processor_id, /* ACPI ID */ processor->lapic_flags & ACPI_MADT_ENABLED); return 0; } static int __init acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end) { struct acpi_madt_local_sapic *processor = NULL; processor = (struct acpi_madt_local_sapic *)header; if (BAD_MADT_ENTRY(processor, end)) return -EINVAL; acpi_table_print_madt_entry(header); acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */ processor->processor_id, /* ACPI ID */ processor->lapic_flags & ACPI_MADT_ENABLED); return 0; } static int __init acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header, const unsigned long end) { struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL; lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header; if (BAD_MADT_ENTRY(lapic_addr_ovr, end)) return -EINVAL; acpi_table_print_madt_entry(header); acpi_lapic_addr = lapic_addr_ovr->address; return 0; } static int __init acpi_parse_x2apic_nmi(struct acpi_subtable_header *header, const unsigned long end) { struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL; x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header; if (BAD_MADT_ENTRY(x2apic_nmi, end)) return -EINVAL; acpi_table_print_madt_entry(header); if (x2apic_nmi->lint != 1) printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n"); return 0; } static int __init acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end) { struct acpi_madt_local_apic_nmi *lapic_nmi = NULL; lapic_nmi = (struct acpi_madt_local_apic_nmi *)header; if (BAD_MADT_ENTRY(lapic_nmi, end)) return -EINVAL; acpi_table_print_madt_entry(header); if (lapic_nmi->lint != 1) printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n"); return 0; } #endif /*CONFIG_X86_LOCAL_APIC */ #ifdef CONFIG_X86_IO_APIC #define MP_ISA_BUS 0 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi) { int ioapic; int pin; struct mpc_intsrc mp_irq; /* * Convert 'gsi' to 'ioapic.pin'. */ ioapic = mp_find_ioapic(gsi); if (ioapic < 0) return; pin = mp_find_ioapic_pin(ioapic, gsi); /* * TBD: This check is for faulty timer entries, where the override * erroneously sets the trigger to level, resulting in a HUGE * increase of timer interrupts! */ if ((bus_irq == 0) && (trigger == 3)) trigger = 1; mp_irq.type = MP_INTSRC; mp_irq.irqtype = mp_INT; mp_irq.irqflag = (trigger << 2) | polarity; mp_irq.srcbus = MP_ISA_BUS; mp_irq.srcbusirq = bus_irq; /* IRQ */ mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */ mp_irq.dstirq = pin; /* INTIN# */ mp_save_irq(&mp_irq); /* * Reset default identity mapping if gsi is also an legacy IRQ, * otherwise there will be more than one entry with the same GSI * and acpi_isa_irq_to_gsi() may give wrong result. */ if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi) isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI; isa_irq_to_gsi[bus_irq] = gsi; } static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger, int polarity) { #ifdef CONFIG_X86_MPPARSE struct mpc_intsrc mp_irq; struct pci_dev *pdev; unsigned char number; unsigned int devfn; int ioapic; u8 pin; if (!acpi_ioapic) return 0; if (!dev || !dev_is_pci(dev)) return 0; pdev = to_pci_dev(dev); number = pdev->bus->number; devfn = pdev->devfn; pin = pdev->pin; /* print the entry should happen on mptable identically */ mp_irq.type = MP_INTSRC; mp_irq.irqtype = mp_INT; mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) | (polarity == ACPI_ACTIVE_HIGH ? 1 : 3); mp_irq.srcbus = number; mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3); ioapic = mp_find_ioapic(gsi); mp_irq.dstapic = mpc_ioapic_id(ioapic); mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi); mp_save_irq(&mp_irq); #endif return 0; } static int __init acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end) { struct acpi_madt_io_apic *ioapic = NULL; struct ioapic_domain_cfg cfg = { .type = IOAPIC_DOMAIN_DYNAMIC, .ops = &mp_ioapic_irqdomain_ops, }; ioapic = (struct acpi_madt_io_apic *)header; if (BAD_MADT_ENTRY(ioapic, end)) return -EINVAL; acpi_table_print_madt_entry(header); /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */ if (ioapic->global_irq_base < nr_legacy_irqs()) cfg.type = IOAPIC_DOMAIN_LEGACY; mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base, &cfg); return 0; } /* * Parse Interrupt Source Override for the ACPI SCI */ static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi) { if (trigger == 0) /* compatible SCI trigger is level */ trigger = 3; if (polarity == 0) /* compatible SCI polarity is low */ polarity = 3; /* Command-line over-ride via acpi_sci= */ if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2; if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK) polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK; mp_override_legacy_irq(bus_irq, polarity, trigger, gsi); acpi_penalize_sci_irq(bus_irq, trigger, polarity); /* * stash over-ride to indicate we've been here * and for later update of acpi_gbl_FADT */ acpi_sci_override_gsi = gsi; return; } static int __init acpi_parse_int_src_ovr(struct acpi_subtable_header * header, const unsigned long end) { struct acpi_madt_interrupt_override *intsrc = NULL; intsrc = (struct acpi_madt_interrupt_override *)header; if (BAD_MADT_ENTRY(intsrc, end)) return -EINVAL; acpi_table_print_madt_entry(header); if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) { acpi_sci_ioapic_setup(intsrc->source_irq, intsrc->inti_flags & ACPI_MADT_POLARITY_MASK, (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2, intsrc->global_irq); return 0; } if (intsrc->source_irq == 0) { if (acpi_skip_timer_override) { printk(PREFIX "BIOS IRQ0 override ignored.\n"); return 0; } if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) { intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK; printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n"); } } mp_override_legacy_irq(intsrc->source_irq, intsrc->inti_flags & ACPI_MADT_POLARITY_MASK, (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2, intsrc->global_irq); return 0; } static int __init acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end) { struct acpi_madt_nmi_source *nmi_src = NULL; nmi_src = (struct acpi_madt_nmi_source *)header; if (BAD_MADT_ENTRY(nmi_src, end)) return -EINVAL; acpi_table_print_madt_entry(header); /* TBD: Support nimsrc entries? */ return 0; } #endif /* CONFIG_X86_IO_APIC */ /* * acpi_pic_sci_set_trigger() * * use ELCR to set PIC-mode trigger type for SCI * * If a PIC-mode SCI is not recognized or gives spurious IRQ7's * it may require Edge Trigger -- use "acpi_sci=edge" * * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge. * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0) * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0) */ void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger) { unsigned int mask = 1 << irq; unsigned int old, new; /* Real old ELCR mask */ old = inb(0x4d0) | (inb(0x4d1) << 8); /* * If we use ACPI to set PCI IRQs, then we should clear ELCR * since we will set it correctly as we enable the PCI irq * routing. */ new = acpi_noirq ? old : 0; /* * Update SCI information in the ELCR, it isn't in the PCI * routing tables.. */ switch (trigger) { case 1: /* Edge - clear */ new &= ~mask; break; case 3: /* Level - set */ new |= mask; break; } if (old == new) return; printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old); outb(new, 0x4d0); outb(new >> 8, 0x4d1); } int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp) { int rc, irq, trigger, polarity; if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) { *irqp = gsi; return 0; } rc = acpi_get_override_irq(gsi, &trigger, &polarity); if (rc == 0) { trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE; polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; irq = acpi_register_gsi(NULL, gsi, trigger, polarity); if (irq >= 0) { *irqp = irq; return 0; } } return -1; } EXPORT_SYMBOL_GPL(acpi_gsi_to_irq); int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi) { if (isa_irq < nr_legacy_irqs() && isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) { *gsi = isa_irq_to_gsi[isa_irq]; return 0; } return -1; } static int acpi_register_gsi_pic(struct device *dev, u32 gsi, int trigger, int polarity) { #ifdef CONFIG_PCI /* * Make sure all (legacy) PCI IRQs are set as level-triggered. */ if (trigger == ACPI_LEVEL_SENSITIVE) elcr_set_level_irq(gsi); #endif return gsi; } #ifdef CONFIG_X86_LOCAL_APIC static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi, int trigger, int polarity) { int irq = gsi; #ifdef CONFIG_X86_IO_APIC int node; struct irq_alloc_info info; node = dev ? dev_to_node(dev) : NUMA_NO_NODE; trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1; polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1; ioapic_set_alloc_attr(&info, node, trigger, polarity); mutex_lock(&acpi_ioapic_lock); irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info); /* Don't set up the ACPI SCI because it's already set up */ if (irq >= 0 && enable_update_mptable && acpi_gbl_FADT.sci_interrupt != gsi) mp_config_acpi_gsi(dev, gsi, trigger, polarity); mutex_unlock(&acpi_ioapic_lock); #endif return irq; } static void acpi_unregister_gsi_ioapic(u32 gsi) { #ifdef CONFIG_X86_IO_APIC int irq; mutex_lock(&acpi_ioapic_lock); irq = mp_map_gsi_to_irq(gsi, 0, NULL); if (irq > 0) mp_unmap_irq(irq); mutex_unlock(&acpi_ioapic_lock); #endif } #endif int (*__acpi_register_gsi)(struct device *dev, u32 gsi, int trigger, int polarity) = acpi_register_gsi_pic; void (*__acpi_unregister_gsi)(u32 gsi) = NULL; #ifdef CONFIG_ACPI_SLEEP int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel; #else int (*acpi_suspend_lowlevel)(void); #endif /* * success: return IRQ number (>=0) * failure: return < 0 */ int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity) { return __acpi_register_gsi(dev, gsi, trigger, polarity); } EXPORT_SYMBOL_GPL(acpi_register_gsi); void acpi_unregister_gsi(u32 gsi) { if (__acpi_unregister_gsi) __acpi_unregister_gsi(gsi); } EXPORT_SYMBOL_GPL(acpi_unregister_gsi); #ifdef CONFIG_X86_LOCAL_APIC static void __init acpi_set_irq_model_ioapic(void) { acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC; __acpi_register_gsi = acpi_register_gsi_ioapic; __acpi_unregister_gsi = acpi_unregister_gsi_ioapic; acpi_ioapic = 1; } #endif /* * ACPI based hotplug support for CPU */ #ifdef CONFIG_ACPI_HOTPLUG_CPU #include static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) { #ifdef CONFIG_ACPI_NUMA int nid; nid = acpi_get_node(handle); if (nid != NUMA_NO_NODE) { set_apicid_to_node(physid, nid); numa_set_node(cpu, nid); } #endif return 0; } int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, int *pcpu) { int cpu; cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED); if (cpu < 0) { pr_info(PREFIX "Unable to map lapic to logical cpu number\n"); return cpu; } acpi_processor_set_pdc(handle); acpi_map_cpu2node(handle, cpu, physid); *pcpu = cpu; return 0; } EXPORT_SYMBOL(acpi_map_cpu); int acpi_unmap_cpu(int cpu) { #ifdef CONFIG_ACPI_NUMA set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE); #endif per_cpu(x86_cpu_to_apicid, cpu) = -1; set_cpu_present(cpu, false); num_processors--; return (0); } EXPORT_SYMBOL(acpi_unmap_cpu); #endif /* CONFIG_ACPI_HOTPLUG_CPU */ int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base) { int ret = -ENOSYS; #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC int ioapic_id; u64 addr; struct ioapic_domain_cfg cfg = { .type = IOAPIC_DOMAIN_DYNAMIC, .ops = &mp_ioapic_irqdomain_ops, }; ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr); if (ioapic_id < 0) { unsigned long long uid; acpi_status status; status = acpi_evaluate_integer(handle, METHOD_NAME__UID, NULL, &uid); if (ACPI_FAILURE(status)) { acpi_handle_warn(handle, "failed to get IOAPIC ID.\n"); return -EINVAL; } ioapic_id = (int)uid; } mutex_lock(&acpi_ioapic_lock); ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg); mutex_unlock(&acpi_ioapic_lock); #endif return ret; } EXPORT_SYMBOL(acpi_register_ioapic); int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base) { int ret = -ENOSYS; #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC mutex_lock(&acpi_ioapic_lock); ret = mp_unregister_ioapic(gsi_base); mutex_unlock(&acpi_ioapic_lock); #endif return ret; } EXPORT_SYMBOL(acpi_unregister_ioapic); /** * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base * has been registered * @handle: ACPI handle of the IOAPIC deivce * @gsi_base: GSI base associated with the IOAPIC * * Assume caller holds some type of lock to serialize acpi_ioapic_registered() * with acpi_register_ioapic()/acpi_unregister_ioapic(). */ int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base) { int ret = 0; #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC mutex_lock(&acpi_ioapic_lock); ret = mp_ioapic_registered(gsi_base); mutex_unlock(&acpi_ioapic_lock); #endif return ret; } static int __init acpi_parse_sbf(struct acpi_table_header *table) { struct acpi_table_boot *sb = (struct acpi_table_boot *)table; sbf_port = sb->cmos_index; /* Save CMOS port */ return 0; } #ifdef CONFIG_HPET_TIMER #include static struct resource *hpet_res __initdata; static int __init acpi_parse_hpet(struct acpi_table_header *table) { struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table; if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) { printk(KERN_WARNING PREFIX "HPET timers must be located in " "memory.\n"); return -1; } hpet_address = hpet_tbl->address.address; hpet_blockid = hpet_tbl->sequence; /* * Some broken BIOSes advertise HPET at 0x0. We really do not * want to allocate a resource there. */ if (!hpet_address) { printk(KERN_WARNING PREFIX "HPET id: %#x base: %#lx is invalid\n", hpet_tbl->id, hpet_address); return 0; } #ifdef CONFIG_X86_64 /* * Some even more broken BIOSes advertise HPET at * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add * some noise: */ if (hpet_address == 0xfed0000000000000UL) { if (!hpet_force_user) { printk(KERN_WARNING PREFIX "HPET id: %#x " "base: 0xfed0000000000000 is bogus\n " "try hpet=force on the kernel command line to " "fix it up to 0xfed00000.\n", hpet_tbl->id); hpet_address = 0; return 0; } printk(KERN_WARNING PREFIX "HPET id: %#x base: 0xfed0000000000000 fixed up " "to 0xfed00000.\n", hpet_tbl->id); hpet_address >>= 32; } #endif printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n", hpet_tbl->id, hpet_address); /* * Allocate and initialize the HPET firmware resource for adding into * the resource tree during the lateinit timeframe. */ #define HPET_RESOURCE_NAME_SIZE 9 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE); hpet_res->name = (void *)&hpet_res[1]; hpet_res->flags = IORESOURCE_MEM; snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u", hpet_tbl->sequence); hpet_res->start = hpet_address; hpet_res->end = hpet_address + (1 * 1024) - 1; return 0; } /* * hpet_insert_resource inserts the HPET resources used into the resource * tree. */ static __init int hpet_insert_resource(void) { if (!hpet_res) return 1; return insert_resource(&iomem_resource, hpet_res); } late_initcall(hpet_insert_resource); #else #define acpi_parse_hpet NULL #endif static int __init acpi_parse_fadt(struct acpi_table_header *table) { if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) { pr_debug("ACPI: no legacy devices present\n"); x86_platform.legacy.devices.pnpbios = 0; } if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) && x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) { pr_debug("ACPI: i8042 controller is absent\n"); x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT; } if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) { pr_debug("ACPI: not registering RTC platform device\n"); x86_platform.legacy.rtc = 0; } #ifdef CONFIG_X86_PM_TIMER /* detect the location of the ACPI PM Timer */ if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) { /* FADT rev. 2 */ if (acpi_gbl_FADT.xpm_timer_block.space_id != ACPI_ADR_SPACE_SYSTEM_IO) return 0; pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address; /* * "X" fields are optional extensions to the original V1.0 * fields, so we must selectively expand V1.0 fields if the * corresponding X field is zero. */ if (!pmtmr_ioport) pmtmr_ioport = acpi_gbl_FADT.pm_timer_block; } else { /* FADT rev. 1 */ pmtmr_ioport = acpi_gbl_FADT.pm_timer_block; } if (pmtmr_ioport) printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n", pmtmr_ioport); #endif return 0; } #ifdef CONFIG_X86_LOCAL_APIC /* * Parse LAPIC entries in MADT * returns 0 on success, < 0 on error */ static int __init early_acpi_parse_madt_lapic_addr_ovr(void) { int count; if (!boot_cpu_has(X86_FEATURE_APIC)) return -ENODEV; /* * Note that the LAPIC address is obtained from the MADT (32-bit value) * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value). */ count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0); if (count < 0) { printk(KERN_ERR PREFIX "Error parsing LAPIC address override entry\n"); return count; } register_lapic_address(acpi_lapic_addr); return count; } static int __init acpi_parse_madt_lapic_entries(void) { int count; int x2count = 0; int ret; struct acpi_subtable_proc madt_proc[2]; if (!boot_cpu_has(X86_FEATURE_APIC)) return -ENODEV; count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_sapic, MAX_LOCAL_APIC); if (!count) { memset(madt_proc, 0, sizeof(madt_proc)); madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC; madt_proc[0].handler = acpi_parse_lapic; madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC; madt_proc[1].handler = acpi_parse_x2apic; ret = acpi_table_parse_entries_array(ACPI_SIG_MADT, sizeof(struct acpi_table_madt), madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC); if (ret < 0) { printk(KERN_ERR PREFIX "Error parsing LAPIC/X2APIC entries\n"); return ret; } count = madt_proc[0].count; x2count = madt_proc[1].count; } if (!count && !x2count) { printk(KERN_ERR PREFIX "No LAPIC entries present\n"); /* TBD: Cleanup to allow fallback to MPS */ return -ENODEV; } else if (count < 0 || x2count < 0) { printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n"); /* TBD: Cleanup to allow fallback to MPS */ return count; } x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI, acpi_parse_x2apic_nmi, 0); count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0); if (count < 0 || x2count < 0) { printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n"); /* TBD: Cleanup to allow fallback to MPS */ return count; } return 0; } #endif /* CONFIG_X86_LOCAL_APIC */ #ifdef CONFIG_X86_IO_APIC static void __init mp_config_acpi_legacy_irqs(void) { int i; struct mpc_intsrc mp_irq; #ifdef CONFIG_EISA /* * Fabricate the legacy ISA bus (bus #31). */ mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA; #endif set_bit(MP_ISA_BUS, mp_bus_not_pci); pr_debug("Bus #%d is ISA\n", MP_ISA_BUS); /* * Use the default configuration for the IRQs 0-15. Unless * overridden by (MADT) interrupt source override entries. */ for (i = 0; i < nr_legacy_irqs(); i++) { int ioapic, pin; unsigned int dstapic; int idx; u32 gsi; /* Locate the gsi that irq i maps to. */ if (acpi_isa_irq_to_gsi(i, &gsi)) continue; /* * Locate the IOAPIC that manages the ISA IRQ. */ ioapic = mp_find_ioapic(gsi); if (ioapic < 0) continue; pin = mp_find_ioapic_pin(ioapic, gsi); dstapic = mpc_ioapic_id(ioapic); for (idx = 0; idx < mp_irq_entries; idx++) { struct mpc_intsrc *irq = mp_irqs + idx; /* Do we already have a mapping for this ISA IRQ? */ if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i) break; /* Do we already have a mapping for this IOAPIC pin */ if (irq->dstapic == dstapic && irq->dstirq == pin) break; } if (idx != mp_irq_entries) { printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i); continue; /* IRQ already used */ } mp_irq.type = MP_INTSRC; mp_irq.irqflag = 0; /* Conforming */ mp_irq.srcbus = MP_ISA_BUS; mp_irq.dstapic = dstapic; mp_irq.irqtype = mp_INT; mp_irq.srcbusirq = i; /* Identity mapped */ mp_irq.dstirq = pin; mp_save_irq(&mp_irq); } } /* * Parse IOAPIC related entries in MADT * returns 0 on success, < 0 on error */ static int __init acpi_parse_madt_ioapic_entries(void) { int count; /* * ACPI interpreter is required to complete interrupt setup, * so if it is off, don't enumerate the io-apics with ACPI. * If MPS is present, it will handle them, * otherwise the system will stay in PIC mode */ if (acpi_disabled || acpi_noirq) return -ENODEV; if (!boot_cpu_has(X86_FEATURE_APIC)) return -ENODEV; /* * if "noapic" boot option, don't look for IO-APICs */ if (skip_ioapic_setup) { printk(KERN_INFO PREFIX "Skipping IOAPIC probe " "due to 'noapic' option.\n"); return -ENODEV; } count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic, MAX_IO_APICS); if (!count) { printk(KERN_ERR PREFIX "No IOAPIC entries present\n"); return -ENODEV; } else if (count < 0) { printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n"); return count; } count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, nr_irqs); if (count < 0) { printk(KERN_ERR PREFIX "Error parsing interrupt source overrides entry\n"); /* TBD: Cleanup to allow fallback to MPS */ return count; } /* * If BIOS did not supply an INT_SRC_OVR for the SCI * pretend we got one so we can set the SCI flags. */ if (!acpi_sci_override_gsi) acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0, acpi_gbl_FADT.sci_interrupt); /* Fill in identity legacy mappings where no override */ mp_config_acpi_legacy_irqs(); count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, nr_irqs); if (count < 0) { printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n"); /* TBD: Cleanup to allow fallback to MPS */ return count; } return 0; } #else static inline int acpi_parse_madt_ioapic_entries(void) { return -1; } #endif /* !CONFIG_X86_IO_APIC */ static void __init early_acpi_process_madt(void) { #ifdef CONFIG_X86_LOCAL_APIC int error; if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) { /* * Parse MADT LAPIC entries */ error = early_acpi_parse_madt_lapic_addr_ovr(); if (!error) { acpi_lapic = 1; smp_found_config = 1; } if (error == -EINVAL) { /* * Dell Precision Workstation 410, 610 come here. */ printk(KERN_ERR PREFIX "Invalid BIOS MADT, disabling ACPI\n"); disable_acpi(); } } #endif } static void __init acpi_process_madt(void) { #ifdef CONFIG_X86_LOCAL_APIC int error; if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) { /* * Parse MADT LAPIC entries */ error = acpi_parse_madt_lapic_entries(); if (!error) { acpi_lapic = 1; /* * Parse MADT IO-APIC entries */ mutex_lock(&acpi_ioapic_lock); error = acpi_parse_madt_ioapic_entries(); mutex_unlock(&acpi_ioapic_lock); if (!error) { acpi_set_irq_model_ioapic(); smp_found_config = 1; } } if (error == -EINVAL) { /* * Dell Precision Workstation 410, 610 come here. */ printk(KERN_ERR PREFIX "Invalid BIOS MADT, disabling ACPI\n"); disable_acpi(); } } else { /* * ACPI found no MADT, and so ACPI wants UP PIC mode. * In the event an MPS table was found, forget it. * Boot with "acpi=off" to use MPS on such a system. */ if (smp_found_config) { printk(KERN_WARNING PREFIX "No APIC-table, disabling MPS\n"); smp_found_config = 0; } } /* * ACPI supports both logical (e.g. Hyper-Threading) and physical * processors, where MPS only supports physical. */ if (acpi_lapic && acpi_ioapic) printk(KERN_INFO "Using ACPI (MADT) for SMP configuration " "information\n"); else if (acpi_lapic) printk(KERN_INFO "Using ACPI for processor (LAPIC) " "configuration information\n"); #endif return; } static int __init disable_acpi_irq(const struct dmi_system_id *d) { if (!acpi_force) { printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n", d->ident); acpi_noirq_set(); } return 0; } static int __init disable_acpi_pci(const struct dmi_system_id *d) { if (!acpi_force) { printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n", d->ident); acpi_disable_pci(); } return 0; } static int __init dmi_disable_acpi(const struct dmi_system_id *d) { if (!acpi_force) { printk(KERN_NOTICE "%s detected: acpi off\n", d->ident); disable_acpi(); } else { printk(KERN_NOTICE "Warning: DMI blacklist says broken, but acpi forced\n"); } return 0; } /* * Force ignoring BIOS IRQ0 override */ static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d) { if (!acpi_skip_timer_override) { pr_notice("%s detected: Ignoring BIOS IRQ0 override\n", d->ident); acpi_skip_timer_override = 1; } return 0; } /* * ACPI offers an alternative platform interface model that removes * ACPI hardware requirements for platforms that do not implement * the PC Architecture. * * We initialize the Hardware-reduced ACPI model here: */ static void __init acpi_reduced_hw_init(void) { if (acpi_gbl_reduced_hardware) { /* * Override x86_init functions and bypass legacy pic * in Hardware-reduced ACPI mode */ x86_init.timers.timer_init = x86_init_noop; x86_init.irqs.pre_vector_init = x86_init_noop; legacy_pic = &null_legacy_pic; } } /* * If your system is blacklisted here, but you find that acpi=force * works for you, please contact linux-acpi@vger.kernel.org */ static struct dmi_system_id __initdata acpi_dmi_table[] = { /* * Boxes that need ACPI disabled */ { .callback = dmi_disable_acpi, .ident = "IBM Thinkpad", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), DMI_MATCH(DMI_BOARD_NAME, "2629H1G"), }, }, /* * Boxes that need ACPI PCI IRQ routing disabled */ { .callback = disable_acpi_irq, .ident = "ASUS A7V", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"), DMI_MATCH(DMI_BOARD_NAME, ""), /* newer BIOS, Revision 1011, does work */ DMI_MATCH(DMI_BIOS_VERSION, "ASUS A7V ACPI BIOS Revision 1007"), }, }, { /* * Latest BIOS for IBM 600E (1.16) has bad pcinum * for LPC bridge, which is needed for the PCI * interrupt links to work. DSDT fix is in bug 5966. * 2645, 2646 model numbers are shared with 600/600E/600X */ .callback = disable_acpi_irq, .ident = "IBM Thinkpad 600 Series 2645", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), DMI_MATCH(DMI_BOARD_NAME, "2645"), }, }, { .callback = disable_acpi_irq, .ident = "IBM Thinkpad 600 Series 2646", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), DMI_MATCH(DMI_BOARD_NAME, "2646"), }, }, /* * Boxes that need ACPI PCI IRQ routing and PCI scan disabled */ { /* _BBN 0 bug */ .callback = disable_acpi_pci, .ident = "ASUS PR-DLS", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"), DMI_MATCH(DMI_BIOS_VERSION, "ASUS PR-DLS ACPI BIOS Revision 1010"), DMI_MATCH(DMI_BIOS_DATE, "03/21/2003") }, }, { .callback = disable_acpi_pci, .ident = "Acer TravelMate 36x Laptop", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Acer"), DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"), }, }, {} }; /* second table for DMI checks that should run after early-quirks */ static struct dmi_system_id __initdata acpi_dmi_table_late[] = { /* * HP laptops which use a DSDT reporting as HP/SB400/10000, * which includes some code which overrides all temperature * trip points to 16C if the INTIN2 input of the I/O APIC * is enabled. This input is incorrectly designated the * ISA IRQ 0 via an interrupt source override even though * it is wired to the output of the master 8259A and INTIN0 * is not connected at all. Force ignoring BIOS IRQ0 * override in that cases. */ { .callback = dmi_ignore_irq0_timer_override, .ident = "HP nx6115 laptop", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"), }, }, { .callback = dmi_ignore_irq0_timer_override, .ident = "HP NX6125 laptop", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"), }, }, { .callback = dmi_ignore_irq0_timer_override, .ident = "HP NX6325 laptop", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"), }, }, { .callback = dmi_ignore_irq0_timer_override, .ident = "HP 6715b laptop", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"), }, }, { .callback = dmi_ignore_irq0_timer_override, .ident = "FUJITSU SIEMENS", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"), }, }, {} }; /* * acpi_boot_table_init() and acpi_boot_init() * called from setup_arch(), always. * 1. checksums all tables * 2. enumerates lapics * 3. enumerates io-apics * * acpi_table_init() is separate to allow reading SRAT without * other side effects. * * side effects of acpi_boot_init: * acpi_lapic = 1 if LAPIC found * acpi_ioapic = 1 if IOAPIC found * if (acpi_lapic && acpi_ioapic) smp_found_config = 1; * if acpi_blacklisted() acpi_disabled = 1; * acpi_irq_model=... * ... */ void __init acpi_boot_table_init(void) { dmi_check_system(acpi_dmi_table); /* * If acpi_disabled, bail out */ if (acpi_disabled) return; /* * Initialize the ACPI boot-time table parser. */ if (acpi_table_init()) { disable_acpi(); return; } acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf); /* * blacklist may disable ACPI entirely */ if (acpi_blacklisted()) { if (acpi_force) { printk(KERN_WARNING PREFIX "acpi=force override\n"); } else { printk(KERN_WARNING PREFIX "Disabling ACPI support\n"); disable_acpi(); return; } } } int __init early_acpi_boot_init(void) { /* * If acpi_disabled, bail out */ if (acpi_disabled) return 1; /* * Process the Multiple APIC Description Table (MADT), if present */ early_acpi_process_madt(); /* * Hardware-reduced ACPI mode initialization: */ acpi_reduced_hw_init(); return 0; } int __init acpi_boot_init(void) { /* those are executed after early-quirks are executed */ dmi_check_system(acpi_dmi_table_late); /* * If acpi_disabled, bail out */ if (acpi_disabled) return 1; acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf); /* * set sci_int and PM timer address */ acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt); /* * Process the Multiple APIC Description Table (MADT), if present */ acpi_process_madt(); acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet); if (IS_ENABLED(CONFIG_ACPI_BGRT)) acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt); if (!acpi_noirq) x86_init.pci.init = pci_acpi_init; return 0; } static int __init parse_acpi(char *arg) { if (!arg) return -EINVAL; /* "acpi=off" disables both ACPI table parsing and interpreter */ if (strcmp(arg, "off") == 0) { disable_acpi(); } /* acpi=force to over-ride black-list */ else if (strcmp(arg, "force") == 0) { acpi_force = 1; acpi_disabled = 0; } /* acpi=strict disables out-of-spec workarounds */ else if (strcmp(arg, "strict") == 0) { acpi_strict = 1; } /* acpi=rsdt use RSDT instead of XSDT */ else if (strcmp(arg, "rsdt") == 0) { acpi_gbl_do_not_use_xsdt = TRUE; } /* "acpi=noirq" disables ACPI interrupt routing */ else if (strcmp(arg, "noirq") == 0) { acpi_noirq_set(); } /* "acpi=copy_dsdt" copys DSDT */ else if (strcmp(arg, "copy_dsdt") == 0) { acpi_gbl_copy_dsdt_locally = 1; } /* "acpi=nocmcff" disables FF mode for corrected errors */ else if (strcmp(arg, "nocmcff") == 0) { acpi_disable_cmcff = 1; } else { /* Core will printk when we return error. */ return -EINVAL; } return 0; } early_param("acpi", parse_acpi); /* FIXME: Using pci= for an ACPI parameter is a travesty. */ static int __init parse_pci(char *arg) { if (arg && strcmp(arg, "noacpi") == 0) acpi_disable_pci(); return 0; } early_param("pci", parse_pci); int __init acpi_mps_check(void) { #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE) /* mptable code is not built-in*/ if (acpi_disabled || acpi_noirq) { printk(KERN_WARNING "MPS support code is not built-in.\n" "Using acpi=off or acpi=noirq or pci=noacpi " "may have problem\n"); return 1; } #endif return 0; } #ifdef CONFIG_X86_IO_APIC static int __init parse_acpi_skip_timer_override(char *arg) { acpi_skip_timer_override = 1; return 0; } early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override); static int __init parse_acpi_use_timer_override(char *arg) { acpi_use_timer_override = 1; return 0; } early_param("acpi_use_timer_override", parse_acpi_use_timer_override); #endif /* CONFIG_X86_IO_APIC */ static int __init setup_acpi_sci(char *s) { if (!s) return -EINVAL; if (!strcmp(s, "edge")) acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE | (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK); else if (!strcmp(s, "level")) acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL | (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK); else if (!strcmp(s, "high")) acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH | (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK); else if (!strcmp(s, "low")) acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW | (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK); else return -EINVAL; return 0; } early_param("acpi_sci", setup_acpi_sci); int __acpi_acquire_global_lock(unsigned int *lock) { unsigned int old, new, val; do { old = *lock; new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1)); val = cmpxchg(lock, old, new); } while (unlikely (val != old)); return (new < 3) ? -1 : 0; } int __acpi_release_global_lock(unsigned int *lock) { unsigned int old, new, val; do { old = *lock; new = old & ~0x3; val = cmpxchg(lock, old, new); } while (unlikely (val != old)); return old & 0x1; } void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size) { e820__range_add(addr, size, E820_TYPE_ACPI); e820__update_table_print(); }