/* * 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 #ifdef CONFIG_X86_LOCAL_APIC # include #endif static int __initdata acpi_force = 0; #ifdef CONFIG_ACPI int acpi_disabled = 0; #else int acpi_disabled = 1; #endif EXPORT_SYMBOL(acpi_disabled); #ifdef CONFIG_X86_64 #include #include #else /* X86 */ #ifdef CONFIG_X86_LOCAL_APIC #include #include #endif /* CONFIG_X86_LOCAL_APIC */ #endif /* X86 */ #define BAD_MADT_ENTRY(entry, end) ( \ (!entry) || (unsigned long)entry + sizeof(*entry) > end || \ ((struct acpi_subtable_header *)entry)->length < sizeof(*entry)) #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_ht __initdata = 1; /* enable HT */ int acpi_lapic; int acpi_ioapic; int acpi_strict; u8 acpi_sci_flags __initdata; int acpi_sci_override_gsi __initdata; int acpi_skip_timer_override __initdata; int acpi_use_timer_override __initdata; #ifdef CONFIG_X86_LOCAL_APIC static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE; #endif #ifndef __HAVE_ARCH_CMPXCHG #warning ACPI uses CMPXCHG, i486 and later hardware #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; #ifdef CONFIG_X86_64 /* rely on all ACPI tables being in the direct mapping */ char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size) { if (!phys_addr || !size) return NULL; if (phys_addr+size <= (max_pfn_mapped << PAGE_SHIFT) + PAGE_SIZE) return __va(phys_addr); return NULL; } #else /* * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END, * to map the target physical address. The problem is that set_fixmap() * provides a single page, and it is possible that the page is not * sufficient. * By using this area, we can map up to MAX_IO_APICS pages temporarily, * i.e. until the next __va_range() call. * * Important Safety Note: The fixed I/O APIC page numbers are *subtracted* * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and * count idx down while incrementing the phys address. */ char *__init __acpi_map_table(unsigned long phys, unsigned long size) { unsigned long base, offset, mapped_size; int idx; if (phys + size < 8 * 1024 * 1024) return __va(phys); offset = phys & (PAGE_SIZE - 1); mapped_size = PAGE_SIZE - offset; set_fixmap(FIX_ACPI_END, phys); base = fix_to_virt(FIX_ACPI_END); /* * Most cases can be covered by the below. */ idx = FIX_ACPI_END; while (mapped_size < size) { if (--idx < FIX_ACPI_BEGIN) return NULL; /* cannot handle this */ phys += PAGE_SIZE; set_fixmap(idx, phys); mapped_size += PAGE_SIZE; } return ((unsigned char *)base + offset); } #endif #ifdef CONFIG_PCI_MMCONFIG /* The physical address of the MMCONFIG aperture. Set from ACPI tables. */ struct acpi_mcfg_allocation *pci_mmcfg_config; int pci_mmcfg_config_num; int __init acpi_parse_mcfg(struct acpi_table_header *header) { struct acpi_table_mcfg *mcfg; unsigned long i; int config_size; if (!header) return -EINVAL; mcfg = (struct acpi_table_mcfg *)header; /* how many config structures do we have */ pci_mmcfg_config_num = 0; i = header->length - sizeof(struct acpi_table_mcfg); while (i >= sizeof(struct acpi_mcfg_allocation)) { ++pci_mmcfg_config_num; i -= sizeof(struct acpi_mcfg_allocation); }; if (pci_mmcfg_config_num == 0) { printk(KERN_ERR PREFIX "MMCONFIG has no entries\n"); return -ENODEV; } config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config); pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL); if (!pci_mmcfg_config) { printk(KERN_WARNING PREFIX "No memory for MCFG config tables\n"); return -ENOMEM; } memcpy(pci_mmcfg_config, &mcfg[1], config_size); for (i = 0; i < pci_mmcfg_config_num; ++i) { if (pci_mmcfg_config[i].address > 0xFFFFFFFF) { printk(KERN_ERR PREFIX "MMCONFIG not in low 4GB of memory\n"); kfree(pci_mmcfg_config); pci_mmcfg_config_num = 0; return -ENODEV; } } return 0; } #endif /* CONFIG_PCI_MMCONFIG */ #ifdef CONFIG_X86_LOCAL_APIC static int __init acpi_parse_madt(struct acpi_table_header *table) { struct acpi_table_madt *madt = NULL; if (!cpu_has_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); } acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id); return 0; } static void __cpuinit acpi_register_lapic(int id, u8 enabled) { if (!enabled) { ++disabled_cpus; return; } generic_processor_info(id, 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); /* * 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->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->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_lapic_addr = lapic_addr_ovr->address; 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 static int __init acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end) { struct acpi_madt_io_apic *ioapic = NULL; ioapic = (struct acpi_madt_io_apic *)header; if (BAD_MADT_ENTRY(ioapic, end)) return -EINVAL; acpi_table_print_madt_entry(header); mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base); return 0; } /* * Parse Interrupt Source Override for the ACPI SCI */ static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger) { 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_config_acpi_legacy_irqs() already setup IRQs < 16 * If GSI is < 16, this will update its flags, * else it will create a new mp_irqs[] entry. */ mp_override_legacy_irq(gsi, polarity, trigger, gsi); /* * 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->global_irq, intsrc->inti_flags & ACPI_MADT_POLARITY_MASK, (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2); return 0; } if (acpi_skip_timer_override && intsrc->source_irq == 0 && intsrc->global_irq == 2) { printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n"); return 0; } 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 *irq) { *irq = gsi; return 0; } /* * success: return IRQ number (>=0) * failure: return < 0 */ int acpi_register_gsi(u32 gsi, int triggering, int polarity) { unsigned int irq; unsigned int plat_gsi = gsi; #ifdef CONFIG_PCI /* * Make sure all (legacy) PCI IRQs are set as level-triggered. */ if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) { extern void eisa_set_level_irq(unsigned int irq); if (triggering == ACPI_LEVEL_SENSITIVE) eisa_set_level_irq(gsi); } #endif #ifdef CONFIG_X86_IO_APIC if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) { plat_gsi = mp_register_gsi(gsi, triggering, polarity); } #endif acpi_gsi_to_irq(plat_gsi, &irq); return irq; } /* * ACPI based hotplug support for CPU */ #ifdef CONFIG_ACPI_HOTPLUG_CPU static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu) { struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; struct acpi_madt_local_apic *lapic; cpumask_t tmp_map, new_map; u8 physid; int cpu; if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) return -EINVAL; if (!buffer.length || !buffer.pointer) return -EINVAL; obj = buffer.pointer; if (obj->type != ACPI_TYPE_BUFFER || obj->buffer.length < sizeof(*lapic)) { kfree(buffer.pointer); return -EINVAL; } lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer; if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC || !(lapic->lapic_flags & ACPI_MADT_ENABLED)) { kfree(buffer.pointer); return -EINVAL; } physid = lapic->id; kfree(buffer.pointer); buffer.length = ACPI_ALLOCATE_BUFFER; buffer.pointer = NULL; tmp_map = cpu_present_map; acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED); /* * If mp_register_lapic successfully generates a new logical cpu * number, then the following will get us exactly what was mapped */ cpus_andnot(new_map, cpu_present_map, tmp_map); if (cpus_empty(new_map)) { printk ("Unable to map lapic to logical cpu number\n"); return -EINVAL; } cpu = first_cpu(new_map); *pcpu = cpu; return 0; } /* wrapper to silence section mismatch warning */ int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu) { return _acpi_map_lsapic(handle, pcpu); } EXPORT_SYMBOL(acpi_map_lsapic); int acpi_unmap_lsapic(int cpu) { per_cpu(x86_cpu_to_apicid, cpu) = -1; cpu_clear(cpu, cpu_present_map); num_processors--; return (0); } EXPORT_SYMBOL(acpi_unmap_lsapic); #endif /* CONFIG_ACPI_HOTPLUG_CPU */ int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base) { /* TBD */ return -EINVAL; } EXPORT_SYMBOL(acpi_register_ioapic); int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base) { /* TBD */ return -EINVAL; } EXPORT_SYMBOL(acpi_unregister_ioapic); static int __init acpi_parse_sbf(struct acpi_table_header *table) { struct acpi_table_boot *sb; sb = (struct acpi_table_boot *)table; if (!sb) { printk(KERN_WARNING PREFIX "Unable to map SBF\n"); return -ENODEV; } sbf_port = sb->cmos_index; /* Save CMOS port */ return 0; } #ifdef CONFIG_HPET_TIMER #include static struct __initdata resource *hpet_res; static int __init acpi_parse_hpet(struct acpi_table_header *table) { struct acpi_table_hpet *hpet_tbl; hpet_tbl = (struct acpi_table_hpet *)table; if (!hpet_tbl) { printk(KERN_WARNING PREFIX "Unable to map HPET\n"); return -ENODEV; } 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; /* * 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) { #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 void __init acpi_register_lapic_address(unsigned long address) { mp_lapic_addr = address; set_fixmap_nocache(FIX_APIC_BASE, address); if (boot_cpu_physical_apicid == -1U) boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id()); } static int __init early_acpi_parse_madt_lapic_addr_ovr(void) { int count; if (!cpu_has_apic) return -ENODEV; /* * Note that the LAPIC address is obtained from the MADT (32-bit value) * and (optionally) overriden 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; } acpi_register_lapic_address(acpi_lapic_addr); return count; } static int __init acpi_parse_madt_lapic_entries(void) { int count; if (!cpu_has_apic) return -ENODEV; /* * Note that the LAPIC address is obtained from the MADT (32-bit value) * and (optionally) overriden 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; } acpi_register_lapic_address(acpi_lapic_addr); count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_sapic, MAX_APICS); if (!count) count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, acpi_parse_lapic, MAX_APICS); if (!count) { printk(KERN_ERR PREFIX "No LAPIC entries present\n"); /* TBD: Cleanup to allow fallback to MPS */ return -ENODEV; } else if (count < 0) { printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n"); /* TBD: Cleanup to allow fallback to MPS */ return count; } count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0); if (count < 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 #define MP_ISA_BUS 0 #ifdef CONFIG_X86_ES7000 extern int es7000_plat; #endif static struct { int apic_id; int gsi_base; int gsi_end; DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1); } mp_ioapic_routing[MAX_IO_APICS]; static int mp_find_ioapic(int gsi) { int i = 0; /* Find the IOAPIC that manages this GSI. */ for (i = 0; i < nr_ioapics; i++) { if ((gsi >= mp_ioapic_routing[i].gsi_base) && (gsi <= mp_ioapic_routing[i].gsi_end)) return i; } printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi); return -1; } static u8 __init uniq_ioapic_id(u8 id) { #ifdef CONFIG_X86_32 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && !APIC_XAPIC(apic_version[boot_cpu_physical_apicid])) return io_apic_get_unique_id(nr_ioapics, id); else return id; #else int i; DECLARE_BITMAP(used, 256); bitmap_zero(used, 256); for (i = 0; i < nr_ioapics; i++) { struct mp_config_ioapic *ia = &mp_ioapics[i]; __set_bit(ia->mp_apicid, used); } if (!test_bit(id, used)) return id; return find_first_zero_bit(used, 256); #endif } static int bad_ioapic(unsigned long address) { if (nr_ioapics >= MAX_IO_APICS) { printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded " "(found %d)\n", MAX_IO_APICS, nr_ioapics); panic("Recompile kernel with bigger MAX_IO_APICS!\n"); } if (!address) { printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address" " found in table, skipping!\n"); return 1; } return 0; } void __init mp_register_ioapic(int id, u32 address, u32 gsi_base) { int idx = 0; if (bad_ioapic(address)) return; idx = nr_ioapics; mp_ioapics[idx].mp_type = MP_IOAPIC; mp_ioapics[idx].mp_flags = MPC_APIC_USABLE; mp_ioapics[idx].mp_apicaddr = address; set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address); mp_ioapics[idx].mp_apicid = uniq_ioapic_id(id); #ifdef CONFIG_X86_32 mp_ioapics[idx].mp_apicver = io_apic_get_version(idx); #else mp_ioapics[idx].mp_apicver = 0; #endif /* * Build basic GSI lookup table to facilitate gsi->io_apic lookups * and to prevent reprogramming of IOAPIC pins (PCI GSIs). */ mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mp_apicid; mp_ioapic_routing[idx].gsi_base = gsi_base; mp_ioapic_routing[idx].gsi_end = gsi_base + io_apic_get_redir_entries(idx); printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%lx, " "GSI %d-%d\n", idx, mp_ioapics[idx].mp_apicid, mp_ioapics[idx].mp_apicver, mp_ioapics[idx].mp_apicaddr, mp_ioapic_routing[idx].gsi_base, mp_ioapic_routing[idx].gsi_end); nr_ioapics++; } void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi) { int ioapic = -1; int pin = -1; /* * Convert 'gsi' to 'ioapic.pin'. */ ioapic = mp_find_ioapic(gsi); if (ioapic < 0) return; pin = gsi - mp_ioapic_routing[ioapic].gsi_base; /* * 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_irqs[mp_irq_entries].mp_type = MP_INTSRC; mp_irqs[mp_irq_entries].mp_irqtype = mp_INT; mp_irqs[mp_irq_entries].mp_irqflag = (trigger << 2) | polarity; mp_irqs[mp_irq_entries].mp_srcbus = MP_ISA_BUS; mp_irqs[mp_irq_entries].mp_srcbusirq = bus_irq; /* IRQ */ mp_irqs[mp_irq_entries].mp_dstapic = mp_ioapics[ioapic].mp_apicid; /* APIC ID */ mp_irqs[mp_irq_entries].mp_dstirq = pin; /* INTIN# */ if (++mp_irq_entries == MAX_IRQ_SOURCES) panic("Max # of irq sources exceeded!!\n"); } void __init mp_config_acpi_legacy_irqs(void) { int i = 0; int ioapic = -1; #if defined (CONFIG_MCA) || defined (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); Dprintk("Bus #%d is ISA\n", MP_ISA_BUS); #ifdef CONFIG_X86_ES7000 /* * Older generations of ES7000 have no legacy identity mappings */ if (es7000_plat == 1) return; #endif /* * Locate the IOAPIC that manages the ISA IRQs (0-15). */ ioapic = mp_find_ioapic(0); if (ioapic < 0) return; /* * Use the default configuration for the IRQs 0-15. Unless * overridden by (MADT) interrupt source override entries. */ for (i = 0; i < 16; i++) { int idx; mp_irqs[mp_irq_entries].mp_type = MP_INTSRC; mp_irqs[mp_irq_entries].mp_irqflag = 0; /* Conforming */ mp_irqs[mp_irq_entries].mp_srcbus = MP_ISA_BUS; mp_irqs[mp_irq_entries].mp_dstapic = mp_ioapics[ioapic].mp_apicid; for (idx = 0; idx < mp_irq_entries; idx++) { struct mp_config_intsrc *irq = mp_irqs + idx; /* Do we already have a mapping for this ISA IRQ? */ if (irq->mp_srcbus == MP_ISA_BUS && irq->mp_srcbusirq == i) break; /* Do we already have a mapping for this IOAPIC pin */ if ((irq->mp_dstapic == mp_irqs[mp_irq_entries].mp_dstapic) && (irq->mp_dstirq == i)) break; } if (idx != mp_irq_entries) { printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i); continue; /* IRQ already used */ } mp_irqs[mp_irq_entries].mp_irqtype = mp_INT; mp_irqs[mp_irq_entries].mp_srcbusirq = i; /* Identity mapped */ mp_irqs[mp_irq_entries].mp_dstirq = i; if (++mp_irq_entries == MAX_IRQ_SOURCES) panic("Max # of irq sources exceeded!!\n"); } } int mp_register_gsi(u32 gsi, int triggering, int polarity) { int ioapic; int ioapic_pin; #ifdef CONFIG_X86_32 #define MAX_GSI_NUM 4096 #define IRQ_COMPRESSION_START 64 static int pci_irq = IRQ_COMPRESSION_START; /* * Mapping between Global System Interrupts, which * represent all possible interrupts, and IRQs * assigned to actual devices. */ static int gsi_to_irq[MAX_GSI_NUM]; #else if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC) return gsi; #endif /* Don't set up the ACPI SCI because it's already set up */ if (acpi_gbl_FADT.sci_interrupt == gsi) return gsi; ioapic = mp_find_ioapic(gsi); if (ioapic < 0) { printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi); return gsi; } ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base; #ifdef CONFIG_X86_32 if (ioapic_renumber_irq) gsi = ioapic_renumber_irq(ioapic, gsi); #endif /* * Avoid pin reprogramming. PRTs typically include entries * with redundant pin->gsi mappings (but unique PCI devices); * we only program the IOAPIC on the first. */ if (ioapic_pin > MP_MAX_IOAPIC_PIN) { printk(KERN_ERR "Invalid reference to IOAPIC pin " "%d-%d\n", mp_ioapic_routing[ioapic].apic_id, ioapic_pin); return gsi; } if (test_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed)) { Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n", mp_ioapic_routing[ioapic].apic_id, ioapic_pin); #ifdef CONFIG_X86_32 return (gsi < IRQ_COMPRESSION_START ? gsi : gsi_to_irq[gsi]); #else return gsi; #endif } set_bit(ioapic_pin, mp_ioapic_routing[ioapic].pin_programmed); #ifdef CONFIG_X86_32 /* * For GSI >= 64, use IRQ compression */ if ((gsi >= IRQ_COMPRESSION_START) && (triggering == ACPI_LEVEL_SENSITIVE)) { /* * For PCI devices assign IRQs in order, avoiding gaps * due to unused I/O APIC pins. */ int irq = gsi; if (gsi < MAX_GSI_NUM) { /* * Retain the VIA chipset work-around (gsi > 15), but * avoid a problem where the 8254 timer (IRQ0) is setup * via an override (so it's not on pin 0 of the ioapic), * and at the same time, the pin 0 interrupt is a PCI * type. The gsi > 15 test could cause these two pins * to be shared as IRQ0, and they are not shareable. * So test for this condition, and if necessary, avoid * the pin collision. */ gsi = pci_irq++; /* * Don't assign IRQ used by ACPI SCI */ if (gsi == acpi_gbl_FADT.sci_interrupt) gsi = pci_irq++; gsi_to_irq[irq] = gsi; } else { printk(KERN_ERR "GSI %u is too high\n", gsi); return gsi; } } #endif io_apic_set_pci_routing(ioapic, ioapic_pin, gsi, triggering == ACPI_EDGE_SENSITIVE ? 0 : 1, polarity == ACPI_ACTIVE_HIGH ? 0 : 1); return gsi; } int mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin, u32 gsi, int triggering, int polarity) { struct mpc_config_intsrc intsrc; int ioapic; /* print the entry should happen on mptable identically */ intsrc.mpc_type = MP_INTSRC; intsrc.mpc_irqtype = mp_INT; intsrc.mpc_irqflag = (triggering == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) | (polarity == ACPI_ACTIVE_HIGH ? 1 : 3); intsrc.mpc_srcbus = number; intsrc.mpc_srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3); ioapic = mp_find_ioapic(gsi); intsrc.mpc_dstapic = mp_ioapic_routing[ioapic].apic_id; intsrc.mpc_dstirq = gsi - mp_ioapic_routing[ioapic].gsi_base; MP_intsrc_info(&intsrc); return 0; } /* * 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 (!cpu_has_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_IRQ_VECTORS); 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); /* Fill in identity legacy mapings where no override */ mp_config_acpi_legacy_irqs(); count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, NR_IRQ_VECTORS); 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; #ifdef CONFIG_X86_GENERICARCH generic_bigsmp_probe(); #endif /* * Parse MADT IO-APIC entries */ error = acpi_parse_madt_ioapic_entries(); if (!error) { acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC; acpi_irq_balance_set(NULL); acpi_ioapic = 1; smp_found_config = 1; setup_apic_routing(); } } if (error == -EINVAL) { /* * Dell Precision Workstation 410, 610 come here. */ printk(KERN_ERR PREFIX "Invalid BIOS MADT, disabling ACPI\n"); disable_acpi(); } } #endif return; } #ifdef __i386__ 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; } /* * Limit ACPI to CPU enumeration for HT */ static int __init force_acpi_ht(const struct dmi_system_id *d) { if (!acpi_force) { printk(KERN_NOTICE "%s detected: force use of acpi=ht\n", d->ident); disable_acpi(); acpi_ht = 1; } else { printk(KERN_NOTICE "Warning: acpi=force overrules DMI blacklist: acpi=ht\n"); } return 0; } /* * If your system is blacklisted here, but you find that acpi=force * works for you, please contact acpi-devel@sourceforge.net */ 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=ht */ { .callback = force_acpi_ht, .ident = "FSC Primergy T850", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"), }, }, { .callback = force_acpi_ht, .ident = "HP VISUALIZE NT Workstation", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"), DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"), }, }, { .callback = force_acpi_ht, .ident = "Compaq Workstation W8000", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"), }, }, { .callback = force_acpi_ht, .ident = "ASUS P4B266", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), DMI_MATCH(DMI_BOARD_NAME, "P4B266"), }, }, { .callback = force_acpi_ht, .ident = "ASUS P2B-DS", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"), }, }, { .callback = force_acpi_ht, .ident = "ASUS CUR-DLS", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"), }, }, { .callback = force_acpi_ht, .ident = "ABIT i440BX-W83977", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT "), DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"), }, }, { .callback = force_acpi_ht, .ident = "IBM Bladecenter", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"), }, }, { .callback = force_acpi_ht, .ident = "IBM eServer xSeries 360", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"), }, }, { .callback = force_acpi_ht, .ident = "IBM eserver xSeries 330", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"), }, }, { .callback = force_acpi_ht, .ident = "IBM eserver xSeries 440", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"), }, }, /* * 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"), }, }, {} }; #endif /* __i386__ */ /* * 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=... * ... * * return value: (currently ignored) * 0: success * !0: failure */ int __init acpi_boot_table_init(void) { int error; #ifdef __i386__ dmi_check_system(acpi_dmi_table); #endif /* * If acpi_disabled, bail out * One exception: acpi=ht continues far enough to enumerate LAPICs */ if (acpi_disabled && !acpi_ht) return 1; /* * Initialize the ACPI boot-time table parser. */ error = acpi_table_init(); if (error) { disable_acpi(); return error; } acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf); /* * blacklist may disable ACPI entirely */ error = acpi_blacklisted(); if (error) { if (acpi_force) { printk(KERN_WARNING PREFIX "acpi=force override\n"); } else { printk(KERN_WARNING PREFIX "Disabling ACPI support\n"); disable_acpi(); return error; } } return 0; } int __init early_acpi_boot_init(void) { /* * If acpi_disabled, bail out * One exception: acpi=ht continues far enough to enumerate LAPICs */ if (acpi_disabled && !acpi_ht) return 1; /* * Process the Multiple APIC Description Table (MADT), if present */ early_acpi_process_madt(); return 0; } int __init acpi_boot_init(void) { /* * If acpi_disabled, bail out * One exception: acpi=ht continues far enough to enumerate LAPICs */ if (acpi_disabled && !acpi_ht) 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); 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_ht = 1; acpi_disabled = 0; } /* acpi=strict disables out-of-spec workarounds */ else if (strcmp(arg, "strict") == 0) { acpi_strict = 1; } /* Limit ACPI just to boot-time to enable HT */ else if (strcmp(arg, "ht") == 0) { if (!acpi_force) disable_acpi(); acpi_ht = 1; } /* "acpi=noirq" disables ACPI interrupt routing */ else if (strcmp(arg, "noirq") == 0) { acpi_noirq_set(); } 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); #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; }