| /* |
| * boot.c - Architecture-Specific Low-Level ACPI Boot Support |
| * |
| * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| * Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com> |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/acpi.h> |
| #include <linux/acpi_pmtmr.h> |
| #include <linux/efi.h> |
| #include <linux/cpumask.h> |
| #include <linux/module.h> |
| #include <linux/dmi.h> |
| #include <linux/irq.h> |
| #include <linux/bootmem.h> |
| #include <linux/ioport.h> |
| |
| #include <asm/pgtable.h> |
| #include <asm/io_apic.h> |
| #include <asm/apic.h> |
| #include <asm/io.h> |
| #include <asm/mpspec.h> |
| #include <asm/smp.h> |
| |
| #ifdef CONFIG_X86_LOCAL_APIC |
| # include <mach_apic.h> |
| #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 <asm/proto.h> |
| #include <asm/genapic.h> |
| |
| #else /* X86 */ |
| |
| #ifdef CONFIG_X86_LOCAL_APIC |
| #include <mach_apic.h> |
| #include <mach_mpparse.h> |
| #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 |
| |
| struct mp_ioapic_routing mp_ioapic_routing[MAX_IO_APICS]; |
| |
| 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 <asm/hpet.h> |
| |
| 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 |
| /* |
| * 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 <http://www.abit.com>"), |
| 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, "<A7V>"), |
| /* 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; |
| } |