2 * boot.c - Architecture-Specific Low-Level ACPI Boot Support
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 * Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <linux/init.h>
27 #include <linux/acpi.h>
28 #include <linux/acpi_pmtmr.h>
29 #include <linux/efi.h>
30 #include <linux/cpumask.h>
31 #include <linux/module.h>
32 #include <linux/dmi.h>
33 #include <linux/irq.h>
34 #include <linux/slab.h>
35 #include <linux/bootmem.h>
36 #include <linux/ioport.h>
37 #include <linux/pci.h>
39 #include <asm/irqdomain.h>
40 #include <asm/pci_x86.h>
41 #include <asm/pgtable.h>
42 #include <asm/io_apic.h>
45 #include <asm/mpspec.h>
47 #include <asm/i8259.h>
49 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
50 static int __initdata acpi_force = 0;
52 EXPORT_SYMBOL(acpi_disabled);
55 # include <asm/proto.h>
58 #define PREFIX "ACPI: "
60 int acpi_noirq; /* skip ACPI IRQ initialization */
61 int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
62 EXPORT_SYMBOL(acpi_pci_disabled);
67 int acpi_disable_cmcff;
69 u8 acpi_sci_flags __initdata;
70 int acpi_sci_override_gsi __initdata;
71 int acpi_skip_timer_override __initdata;
72 int acpi_use_timer_override __initdata;
73 int acpi_fix_pin2_polarity __initdata;
75 #ifdef CONFIG_X86_LOCAL_APIC
76 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
80 * Locks related to IOAPIC hotplug
82 * ->device_hotplug_lock
85 * Interrupt mapping side:
90 static DEFINE_MUTEX(acpi_ioapic_lock);
92 /* --------------------------------------------------------------------------
93 Boot-time Configuration
94 -------------------------------------------------------------------------- */
97 * The default interrupt routing model is PIC (8259). This gets
98 * overridden if IOAPICs are enumerated (below).
100 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
104 * ISA irqs by default are the first 16 gsis but can be
105 * any gsi as specified by an interrupt source override.
107 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
108 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
111 #define ACPI_INVALID_GSI INT_MIN
114 * This is just a simple wrapper around early_ioremap(),
115 * with sanity checks for phys == 0 and size == 0.
117 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
123 return early_ioremap(phys, size);
126 void __init __acpi_unmap_table(char *map, unsigned long size)
131 early_iounmap(map, size);
134 #ifdef CONFIG_X86_LOCAL_APIC
135 static int __init acpi_parse_madt(struct acpi_table_header *table)
137 struct acpi_table_madt *madt = NULL;
142 madt = (struct acpi_table_madt *)table;
144 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
149 acpi_lapic_addr = (u64) madt->address;
151 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
155 default_acpi_madt_oem_check(madt->header.oem_id,
156 madt->header.oem_table_id);
162 * acpi_register_lapic - register a local apic and generates a logic cpu number
163 * @id: local apic id to register
164 * @enabled: this cpu is enabled or not
166 * Returns the logic cpu number which maps to the local apic
168 static int acpi_register_lapic(int id, u8 enabled)
170 unsigned int ver = 0;
172 if (id >= MAX_LOCAL_APIC) {
173 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
182 if (boot_cpu_physical_apicid != -1U)
183 ver = apic_version[boot_cpu_physical_apicid];
185 return generic_processor_info(id, ver);
189 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
191 struct acpi_madt_local_x2apic *processor = NULL;
195 processor = (struct acpi_madt_local_x2apic *)header;
197 if (BAD_MADT_ENTRY(processor, end))
200 acpi_table_print_madt_entry(header);
202 apic_id = processor->local_apic_id;
203 enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
204 #ifdef CONFIG_X86_X2APIC
206 * We need to register disabled CPU as well to permit
207 * counting disabled CPUs. This allows us to size
208 * cpus_possible_map more accurately, to permit
209 * to not preallocating memory for all NR_CPUS
210 * when we use CPU hotplug.
212 if (!apic->apic_id_valid(apic_id) && enabled)
213 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
215 acpi_register_lapic(apic_id, enabled);
217 printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
224 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
226 struct acpi_madt_local_apic *processor = NULL;
228 processor = (struct acpi_madt_local_apic *)header;
230 if (BAD_MADT_ENTRY(processor, end))
233 acpi_table_print_madt_entry(header);
236 * We need to register disabled CPU as well to permit
237 * counting disabled CPUs. This allows us to size
238 * cpus_possible_map more accurately, to permit
239 * to not preallocating memory for all NR_CPUS
240 * when we use CPU hotplug.
242 acpi_register_lapic(processor->id, /* APIC ID */
243 processor->lapic_flags & ACPI_MADT_ENABLED);
249 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
251 struct acpi_madt_local_sapic *processor = NULL;
253 processor = (struct acpi_madt_local_sapic *)header;
255 if (BAD_MADT_ENTRY(processor, end))
258 acpi_table_print_madt_entry(header);
260 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
261 processor->lapic_flags & ACPI_MADT_ENABLED);
267 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
268 const unsigned long end)
270 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
272 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
274 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
277 acpi_lapic_addr = lapic_addr_ovr->address;
283 acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
284 const unsigned long end)
286 struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
288 x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
290 if (BAD_MADT_ENTRY(x2apic_nmi, end))
293 acpi_table_print_madt_entry(header);
295 if (x2apic_nmi->lint != 1)
296 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
302 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
304 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
306 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
308 if (BAD_MADT_ENTRY(lapic_nmi, end))
311 acpi_table_print_madt_entry(header);
313 if (lapic_nmi->lint != 1)
314 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
319 #endif /*CONFIG_X86_LOCAL_APIC */
321 #ifdef CONFIG_X86_IO_APIC
324 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
329 struct mpc_intsrc mp_irq;
332 * Convert 'gsi' to 'ioapic.pin'.
334 ioapic = mp_find_ioapic(gsi);
337 pin = mp_find_ioapic_pin(ioapic, gsi);
340 * TBD: This check is for faulty timer entries, where the override
341 * erroneously sets the trigger to level, resulting in a HUGE
342 * increase of timer interrupts!
344 if ((bus_irq == 0) && (trigger == 3))
347 mp_irq.type = MP_INTSRC;
348 mp_irq.irqtype = mp_INT;
349 mp_irq.irqflag = (trigger << 2) | polarity;
350 mp_irq.srcbus = MP_ISA_BUS;
351 mp_irq.srcbusirq = bus_irq; /* IRQ */
352 mp_irq.dstapic = mpc_ioapic_id(ioapic); /* APIC ID */
353 mp_irq.dstirq = pin; /* INTIN# */
355 mp_save_irq(&mp_irq);
358 * Reset default identity mapping if gsi is also an legacy IRQ,
359 * otherwise there will be more than one entry with the same GSI
360 * and acpi_isa_irq_to_gsi() may give wrong result.
362 if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
363 isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI;
364 isa_irq_to_gsi[bus_irq] = gsi;
367 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
370 #ifdef CONFIG_X86_MPPARSE
371 struct mpc_intsrc mp_irq;
372 struct pci_dev *pdev;
373 unsigned char number;
380 if (!dev || !dev_is_pci(dev))
383 pdev = to_pci_dev(dev);
384 number = pdev->bus->number;
387 /* print the entry should happen on mptable identically */
388 mp_irq.type = MP_INTSRC;
389 mp_irq.irqtype = mp_INT;
390 mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
391 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
392 mp_irq.srcbus = number;
393 mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
394 ioapic = mp_find_ioapic(gsi);
395 mp_irq.dstapic = mpc_ioapic_id(ioapic);
396 mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
398 mp_save_irq(&mp_irq);
404 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
406 struct acpi_madt_io_apic *ioapic = NULL;
407 struct ioapic_domain_cfg cfg = {
408 .type = IOAPIC_DOMAIN_DYNAMIC,
409 .ops = &mp_ioapic_irqdomain_ops,
412 ioapic = (struct acpi_madt_io_apic *)header;
414 if (BAD_MADT_ENTRY(ioapic, end))
417 acpi_table_print_madt_entry(header);
419 /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
420 if (ioapic->global_irq_base < nr_legacy_irqs())
421 cfg.type = IOAPIC_DOMAIN_LEGACY;
423 mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
430 * Parse Interrupt Source Override for the ACPI SCI
432 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
434 if (trigger == 0) /* compatible SCI trigger is level */
437 if (polarity == 0) /* compatible SCI polarity is low */
440 /* Command-line over-ride via acpi_sci= */
441 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
442 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
444 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
445 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
447 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
448 acpi_penalize_sci_irq(bus_irq, trigger, polarity);
451 * stash over-ride to indicate we've been here
452 * and for later update of acpi_gbl_FADT
454 acpi_sci_override_gsi = gsi;
459 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
460 const unsigned long end)
462 struct acpi_madt_interrupt_override *intsrc = NULL;
464 intsrc = (struct acpi_madt_interrupt_override *)header;
466 if (BAD_MADT_ENTRY(intsrc, end))
469 acpi_table_print_madt_entry(header);
471 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
472 acpi_sci_ioapic_setup(intsrc->source_irq,
473 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
474 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
479 if (intsrc->source_irq == 0) {
480 if (acpi_skip_timer_override) {
481 printk(PREFIX "BIOS IRQ0 override ignored.\n");
485 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
486 && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
487 intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
488 printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
492 mp_override_legacy_irq(intsrc->source_irq,
493 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
494 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
501 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
503 struct acpi_madt_nmi_source *nmi_src = NULL;
505 nmi_src = (struct acpi_madt_nmi_source *)header;
507 if (BAD_MADT_ENTRY(nmi_src, end))
510 acpi_table_print_madt_entry(header);
512 /* TBD: Support nimsrc entries? */
517 #endif /* CONFIG_X86_IO_APIC */
520 * acpi_pic_sci_set_trigger()
522 * use ELCR to set PIC-mode trigger type for SCI
524 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
525 * it may require Edge Trigger -- use "acpi_sci=edge"
527 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
528 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
529 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
530 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
533 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
535 unsigned int mask = 1 << irq;
536 unsigned int old, new;
538 /* Real old ELCR mask */
539 old = inb(0x4d0) | (inb(0x4d1) << 8);
542 * If we use ACPI to set PCI IRQs, then we should clear ELCR
543 * since we will set it correctly as we enable the PCI irq
546 new = acpi_noirq ? old : 0;
549 * Update SCI information in the ELCR, it isn't in the PCI
553 case 1: /* Edge - clear */
556 case 3: /* Level - set */
564 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
566 outb(new >> 8, 0x4d1);
569 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
571 int rc, irq, trigger, polarity;
573 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
578 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
580 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
581 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
582 irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
591 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
593 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
595 if (isa_irq < nr_legacy_irqs() &&
596 isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) {
597 *gsi = isa_irq_to_gsi[isa_irq];
604 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
605 int trigger, int polarity)
609 * Make sure all (legacy) PCI IRQs are set as level-triggered.
611 if (trigger == ACPI_LEVEL_SENSITIVE)
612 elcr_set_level_irq(gsi);
618 #ifdef CONFIG_X86_LOCAL_APIC
619 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
620 int trigger, int polarity)
623 #ifdef CONFIG_X86_IO_APIC
625 struct irq_alloc_info info;
627 node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
628 trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
629 polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
630 ioapic_set_alloc_attr(&info, node, trigger, polarity);
632 mutex_lock(&acpi_ioapic_lock);
633 irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
634 /* Don't set up the ACPI SCI because it's already set up */
635 if (irq >= 0 && enable_update_mptable &&
636 acpi_gbl_FADT.sci_interrupt != gsi)
637 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
638 mutex_unlock(&acpi_ioapic_lock);
644 static void acpi_unregister_gsi_ioapic(u32 gsi)
646 #ifdef CONFIG_X86_IO_APIC
649 mutex_lock(&acpi_ioapic_lock);
650 irq = mp_map_gsi_to_irq(gsi, 0, NULL);
653 mutex_unlock(&acpi_ioapic_lock);
658 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
659 int trigger, int polarity) = acpi_register_gsi_pic;
660 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
662 #ifdef CONFIG_ACPI_SLEEP
663 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
665 int (*acpi_suspend_lowlevel)(void);
669 * success: return IRQ number (>=0)
670 * failure: return < 0
672 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
674 return __acpi_register_gsi(dev, gsi, trigger, polarity);
676 EXPORT_SYMBOL_GPL(acpi_register_gsi);
678 void acpi_unregister_gsi(u32 gsi)
680 if (__acpi_unregister_gsi)
681 __acpi_unregister_gsi(gsi);
683 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
685 #ifdef CONFIG_X86_LOCAL_APIC
686 static void __init acpi_set_irq_model_ioapic(void)
688 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
689 __acpi_register_gsi = acpi_register_gsi_ioapic;
690 __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
696 * ACPI based hotplug support for CPU
698 #ifdef CONFIG_ACPI_HOTPLUG_CPU
699 #include <acpi/processor.h>
701 static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
703 #ifdef CONFIG_ACPI_NUMA
706 nid = acpi_get_node(handle);
708 set_apicid_to_node(physid, nid);
709 numa_set_node(cpu, nid);
714 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
718 cpu = acpi_register_lapic(physid, ACPI_MADT_ENABLED);
720 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
724 acpi_processor_set_pdc(handle);
725 acpi_map_cpu2node(handle, cpu, physid);
731 /* wrapper to silence section mismatch warning */
732 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
734 return _acpi_map_lsapic(handle, physid, pcpu);
736 EXPORT_SYMBOL(acpi_map_cpu);
738 int acpi_unmap_cpu(int cpu)
740 #ifdef CONFIG_ACPI_NUMA
741 set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
744 per_cpu(x86_cpu_to_apicid, cpu) = -1;
745 set_cpu_present(cpu, false);
750 EXPORT_SYMBOL(acpi_unmap_cpu);
751 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
753 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
756 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
759 struct ioapic_domain_cfg cfg = {
760 .type = IOAPIC_DOMAIN_DYNAMIC,
761 .ops = &mp_ioapic_irqdomain_ops,
764 ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
766 unsigned long long uid;
769 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
771 if (ACPI_FAILURE(status)) {
772 acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
775 ioapic_id = (int)uid;
778 mutex_lock(&acpi_ioapic_lock);
779 ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
780 mutex_unlock(&acpi_ioapic_lock);
785 EXPORT_SYMBOL(acpi_register_ioapic);
787 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
791 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
792 mutex_lock(&acpi_ioapic_lock);
793 ret = mp_unregister_ioapic(gsi_base);
794 mutex_unlock(&acpi_ioapic_lock);
799 EXPORT_SYMBOL(acpi_unregister_ioapic);
802 * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
803 * has been registered
804 * @handle: ACPI handle of the IOAPIC deivce
805 * @gsi_base: GSI base associated with the IOAPIC
807 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
808 * with acpi_register_ioapic()/acpi_unregister_ioapic().
810 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
814 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
815 mutex_lock(&acpi_ioapic_lock);
816 ret = mp_ioapic_registered(gsi_base);
817 mutex_unlock(&acpi_ioapic_lock);
823 static int __init acpi_parse_sbf(struct acpi_table_header *table)
825 struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
827 sbf_port = sb->cmos_index; /* Save CMOS port */
832 #ifdef CONFIG_HPET_TIMER
833 #include <asm/hpet.h>
835 static struct resource *hpet_res __initdata;
837 static int __init acpi_parse_hpet(struct acpi_table_header *table)
839 struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
841 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
842 printk(KERN_WARNING PREFIX "HPET timers must be located in "
847 hpet_address = hpet_tbl->address.address;
848 hpet_blockid = hpet_tbl->sequence;
851 * Some broken BIOSes advertise HPET at 0x0. We really do not
852 * want to allocate a resource there.
855 printk(KERN_WARNING PREFIX
856 "HPET id: %#x base: %#lx is invalid\n",
857 hpet_tbl->id, hpet_address);
862 * Some even more broken BIOSes advertise HPET at
863 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
866 if (hpet_address == 0xfed0000000000000UL) {
867 if (!hpet_force_user) {
868 printk(KERN_WARNING PREFIX "HPET id: %#x "
869 "base: 0xfed0000000000000 is bogus\n "
870 "try hpet=force on the kernel command line to "
871 "fix it up to 0xfed00000.\n", hpet_tbl->id);
875 printk(KERN_WARNING PREFIX
876 "HPET id: %#x base: 0xfed0000000000000 fixed up "
877 "to 0xfed00000.\n", hpet_tbl->id);
881 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
882 hpet_tbl->id, hpet_address);
885 * Allocate and initialize the HPET firmware resource for adding into
886 * the resource tree during the lateinit timeframe.
888 #define HPET_RESOURCE_NAME_SIZE 9
889 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
891 hpet_res->name = (void *)&hpet_res[1];
892 hpet_res->flags = IORESOURCE_MEM;
893 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
896 hpet_res->start = hpet_address;
897 hpet_res->end = hpet_address + (1 * 1024) - 1;
903 * hpet_insert_resource inserts the HPET resources used into the resource
906 static __init int hpet_insert_resource(void)
911 return insert_resource(&iomem_resource, hpet_res);
914 late_initcall(hpet_insert_resource);
917 #define acpi_parse_hpet NULL
920 static int __init acpi_parse_fadt(struct acpi_table_header *table)
923 #ifdef CONFIG_X86_PM_TIMER
924 /* detect the location of the ACPI PM Timer */
925 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
927 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
928 ACPI_ADR_SPACE_SYSTEM_IO)
931 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
933 * "X" fields are optional extensions to the original V1.0
934 * fields, so we must selectively expand V1.0 fields if the
935 * corresponding X field is zero.
938 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
941 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
944 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
950 #ifdef CONFIG_X86_LOCAL_APIC
952 * Parse LAPIC entries in MADT
953 * returns 0 on success, < 0 on error
956 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
964 * Note that the LAPIC address is obtained from the MADT (32-bit value)
965 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
968 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
969 acpi_parse_lapic_addr_ovr, 0);
971 printk(KERN_ERR PREFIX
972 "Error parsing LAPIC address override entry\n");
976 register_lapic_address(acpi_lapic_addr);
981 static int __init acpi_parse_madt_lapic_entries(void)
990 * Note that the LAPIC address is obtained from the MADT (32-bit value)
991 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
994 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
995 acpi_parse_lapic_addr_ovr, 0);
997 printk(KERN_ERR PREFIX
998 "Error parsing LAPIC address override entry\n");
1002 register_lapic_address(acpi_lapic_addr);
1004 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1005 acpi_parse_sapic, MAX_LOCAL_APIC);
1008 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
1009 acpi_parse_x2apic, MAX_LOCAL_APIC);
1010 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
1011 acpi_parse_lapic, MAX_LOCAL_APIC);
1013 if (!count && !x2count) {
1014 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1015 /* TBD: Cleanup to allow fallback to MPS */
1017 } else if (count < 0 || x2count < 0) {
1018 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1019 /* TBD: Cleanup to allow fallback to MPS */
1023 x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1024 acpi_parse_x2apic_nmi, 0);
1025 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1026 acpi_parse_lapic_nmi, 0);
1027 if (count < 0 || x2count < 0) {
1028 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1029 /* TBD: Cleanup to allow fallback to MPS */
1034 #endif /* CONFIG_X86_LOCAL_APIC */
1036 #ifdef CONFIG_X86_IO_APIC
1037 static void __init mp_config_acpi_legacy_irqs(void)
1040 struct mpc_intsrc mp_irq;
1044 * Fabricate the legacy ISA bus (bus #31).
1046 mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1048 set_bit(MP_ISA_BUS, mp_bus_not_pci);
1049 pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1052 * Use the default configuration for the IRQs 0-15. Unless
1053 * overridden by (MADT) interrupt source override entries.
1055 for (i = 0; i < nr_legacy_irqs(); i++) {
1057 unsigned int dstapic;
1061 /* Locate the gsi that irq i maps to. */
1062 if (acpi_isa_irq_to_gsi(i, &gsi))
1066 * Locate the IOAPIC that manages the ISA IRQ.
1068 ioapic = mp_find_ioapic(gsi);
1071 pin = mp_find_ioapic_pin(ioapic, gsi);
1072 dstapic = mpc_ioapic_id(ioapic);
1074 for (idx = 0; idx < mp_irq_entries; idx++) {
1075 struct mpc_intsrc *irq = mp_irqs + idx;
1077 /* Do we already have a mapping for this ISA IRQ? */
1078 if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1081 /* Do we already have a mapping for this IOAPIC pin */
1082 if (irq->dstapic == dstapic && irq->dstirq == pin)
1086 if (idx != mp_irq_entries) {
1087 printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1088 continue; /* IRQ already used */
1091 mp_irq.type = MP_INTSRC;
1092 mp_irq.irqflag = 0; /* Conforming */
1093 mp_irq.srcbus = MP_ISA_BUS;
1094 mp_irq.dstapic = dstapic;
1095 mp_irq.irqtype = mp_INT;
1096 mp_irq.srcbusirq = i; /* Identity mapped */
1097 mp_irq.dstirq = pin;
1099 mp_save_irq(&mp_irq);
1104 * Parse IOAPIC related entries in MADT
1105 * returns 0 on success, < 0 on error
1107 static int __init acpi_parse_madt_ioapic_entries(void)
1112 * ACPI interpreter is required to complete interrupt setup,
1113 * so if it is off, don't enumerate the io-apics with ACPI.
1114 * If MPS is present, it will handle them,
1115 * otherwise the system will stay in PIC mode
1117 if (acpi_disabled || acpi_noirq)
1124 * if "noapic" boot option, don't look for IO-APICs
1126 if (skip_ioapic_setup) {
1127 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1128 "due to 'noapic' option.\n");
1132 count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1135 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1137 } else if (count < 0) {
1138 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1142 count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1143 acpi_parse_int_src_ovr, nr_irqs);
1145 printk(KERN_ERR PREFIX
1146 "Error parsing interrupt source overrides entry\n");
1147 /* TBD: Cleanup to allow fallback to MPS */
1152 * If BIOS did not supply an INT_SRC_OVR for the SCI
1153 * pretend we got one so we can set the SCI flags.
1155 if (!acpi_sci_override_gsi)
1156 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1157 acpi_gbl_FADT.sci_interrupt);
1159 /* Fill in identity legacy mappings where no override */
1160 mp_config_acpi_legacy_irqs();
1162 count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1163 acpi_parse_nmi_src, nr_irqs);
1165 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1166 /* TBD: Cleanup to allow fallback to MPS */
1173 static inline int acpi_parse_madt_ioapic_entries(void)
1177 #endif /* !CONFIG_X86_IO_APIC */
1179 static void __init early_acpi_process_madt(void)
1181 #ifdef CONFIG_X86_LOCAL_APIC
1184 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1187 * Parse MADT LAPIC entries
1189 error = early_acpi_parse_madt_lapic_addr_ovr();
1192 smp_found_config = 1;
1194 if (error == -EINVAL) {
1196 * Dell Precision Workstation 410, 610 come here.
1198 printk(KERN_ERR PREFIX
1199 "Invalid BIOS MADT, disabling ACPI\n");
1206 static void __init acpi_process_madt(void)
1208 #ifdef CONFIG_X86_LOCAL_APIC
1211 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1214 * Parse MADT LAPIC entries
1216 error = acpi_parse_madt_lapic_entries();
1221 * Parse MADT IO-APIC entries
1223 mutex_lock(&acpi_ioapic_lock);
1224 error = acpi_parse_madt_ioapic_entries();
1225 mutex_unlock(&acpi_ioapic_lock);
1227 acpi_set_irq_model_ioapic();
1229 smp_found_config = 1;
1232 if (error == -EINVAL) {
1234 * Dell Precision Workstation 410, 610 come here.
1236 printk(KERN_ERR PREFIX
1237 "Invalid BIOS MADT, disabling ACPI\n");
1242 * ACPI found no MADT, and so ACPI wants UP PIC mode.
1243 * In the event an MPS table was found, forget it.
1244 * Boot with "acpi=off" to use MPS on such a system.
1246 if (smp_found_config) {
1247 printk(KERN_WARNING PREFIX
1248 "No APIC-table, disabling MPS\n");
1249 smp_found_config = 0;
1254 * ACPI supports both logical (e.g. Hyper-Threading) and physical
1255 * processors, where MPS only supports physical.
1257 if (acpi_lapic && acpi_ioapic)
1258 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1260 else if (acpi_lapic)
1261 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1262 "configuration information\n");
1267 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1270 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1277 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1280 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1287 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1290 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1294 "Warning: DMI blacklist says broken, but acpi forced\n");
1300 * Force ignoring BIOS IRQ0 override
1302 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1304 if (!acpi_skip_timer_override) {
1305 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1307 acpi_skip_timer_override = 1;
1313 * ACPI offers an alternative platform interface model that removes
1314 * ACPI hardware requirements for platforms that do not implement
1315 * the PC Architecture.
1317 * We initialize the Hardware-reduced ACPI model here:
1319 static void __init acpi_reduced_hw_init(void)
1321 if (acpi_gbl_reduced_hardware) {
1323 * Override x86_init functions and bypass legacy pic
1324 * in Hardware-reduced ACPI mode
1326 x86_init.timers.timer_init = x86_init_noop;
1327 x86_init.irqs.pre_vector_init = x86_init_noop;
1328 legacy_pic = &null_legacy_pic;
1333 * If your system is blacklisted here, but you find that acpi=force
1334 * works for you, please contact linux-acpi@vger.kernel.org
1336 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1338 * Boxes that need ACPI disabled
1341 .callback = dmi_disable_acpi,
1342 .ident = "IBM Thinkpad",
1344 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1345 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1350 * Boxes that need ACPI PCI IRQ routing disabled
1353 .callback = disable_acpi_irq,
1354 .ident = "ASUS A7V",
1356 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1357 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1358 /* newer BIOS, Revision 1011, does work */
1359 DMI_MATCH(DMI_BIOS_VERSION,
1360 "ASUS A7V ACPI BIOS Revision 1007"),
1365 * Latest BIOS for IBM 600E (1.16) has bad pcinum
1366 * for LPC bridge, which is needed for the PCI
1367 * interrupt links to work. DSDT fix is in bug 5966.
1368 * 2645, 2646 model numbers are shared with 600/600E/600X
1370 .callback = disable_acpi_irq,
1371 .ident = "IBM Thinkpad 600 Series 2645",
1373 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1374 DMI_MATCH(DMI_BOARD_NAME, "2645"),
1378 .callback = disable_acpi_irq,
1379 .ident = "IBM Thinkpad 600 Series 2646",
1381 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1382 DMI_MATCH(DMI_BOARD_NAME, "2646"),
1386 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1389 .callback = disable_acpi_pci,
1390 .ident = "ASUS PR-DLS",
1392 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1393 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1394 DMI_MATCH(DMI_BIOS_VERSION,
1395 "ASUS PR-DLS ACPI BIOS Revision 1010"),
1396 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1400 .callback = disable_acpi_pci,
1401 .ident = "Acer TravelMate 36x Laptop",
1403 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1404 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1410 /* second table for DMI checks that should run after early-quirks */
1411 static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
1413 * HP laptops which use a DSDT reporting as HP/SB400/10000,
1414 * which includes some code which overrides all temperature
1415 * trip points to 16C if the INTIN2 input of the I/O APIC
1416 * is enabled. This input is incorrectly designated the
1417 * ISA IRQ 0 via an interrupt source override even though
1418 * it is wired to the output of the master 8259A and INTIN0
1419 * is not connected at all. Force ignoring BIOS IRQ0
1420 * override in that cases.
1423 .callback = dmi_ignore_irq0_timer_override,
1424 .ident = "HP nx6115 laptop",
1426 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1427 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1431 .callback = dmi_ignore_irq0_timer_override,
1432 .ident = "HP NX6125 laptop",
1434 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1435 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1439 .callback = dmi_ignore_irq0_timer_override,
1440 .ident = "HP NX6325 laptop",
1442 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1443 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1447 .callback = dmi_ignore_irq0_timer_override,
1448 .ident = "HP 6715b laptop",
1450 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1451 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1455 .callback = dmi_ignore_irq0_timer_override,
1456 .ident = "FUJITSU SIEMENS",
1458 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1459 DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1466 * acpi_boot_table_init() and acpi_boot_init()
1467 * called from setup_arch(), always.
1468 * 1. checksums all tables
1469 * 2. enumerates lapics
1470 * 3. enumerates io-apics
1472 * acpi_table_init() is separate to allow reading SRAT without
1473 * other side effects.
1475 * side effects of acpi_boot_init:
1476 * acpi_lapic = 1 if LAPIC found
1477 * acpi_ioapic = 1 if IOAPIC found
1478 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1479 * if acpi_blacklisted() acpi_disabled = 1;
1480 * acpi_irq_model=...
1484 void __init acpi_boot_table_init(void)
1486 dmi_check_system(acpi_dmi_table);
1489 * If acpi_disabled, bail out
1495 * Initialize the ACPI boot-time table parser.
1497 if (acpi_table_init()) {
1502 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1505 * blacklist may disable ACPI entirely
1507 if (acpi_blacklisted()) {
1509 printk(KERN_WARNING PREFIX "acpi=force override\n");
1511 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1518 int __init early_acpi_boot_init(void)
1521 * If acpi_disabled, bail out
1527 * Process the Multiple APIC Description Table (MADT), if present
1529 early_acpi_process_madt();
1532 * Hardware-reduced ACPI mode initialization:
1534 acpi_reduced_hw_init();
1539 int __init acpi_boot_init(void)
1541 /* those are executed after early-quirks are executed */
1542 dmi_check_system(acpi_dmi_table_late);
1545 * If acpi_disabled, bail out
1550 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1553 * set sci_int and PM timer address
1555 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1558 * Process the Multiple APIC Description Table (MADT), if present
1560 acpi_process_madt();
1562 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1565 x86_init.pci.init = pci_acpi_init;
1570 static int __init parse_acpi(char *arg)
1575 /* "acpi=off" disables both ACPI table parsing and interpreter */
1576 if (strcmp(arg, "off") == 0) {
1579 /* acpi=force to over-ride black-list */
1580 else if (strcmp(arg, "force") == 0) {
1584 /* acpi=strict disables out-of-spec workarounds */
1585 else if (strcmp(arg, "strict") == 0) {
1588 /* acpi=rsdt use RSDT instead of XSDT */
1589 else if (strcmp(arg, "rsdt") == 0) {
1590 acpi_gbl_do_not_use_xsdt = TRUE;
1592 /* "acpi=noirq" disables ACPI interrupt routing */
1593 else if (strcmp(arg, "noirq") == 0) {
1596 /* "acpi=copy_dsdt" copys DSDT */
1597 else if (strcmp(arg, "copy_dsdt") == 0) {
1598 acpi_gbl_copy_dsdt_locally = 1;
1600 /* "acpi=nocmcff" disables FF mode for corrected errors */
1601 else if (strcmp(arg, "nocmcff") == 0) {
1602 acpi_disable_cmcff = 1;
1604 /* Core will printk when we return error. */
1609 early_param("acpi", parse_acpi);
1611 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1612 static int __init parse_pci(char *arg)
1614 if (arg && strcmp(arg, "noacpi") == 0)
1618 early_param("pci", parse_pci);
1620 int __init acpi_mps_check(void)
1622 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1623 /* mptable code is not built-in*/
1624 if (acpi_disabled || acpi_noirq) {
1625 printk(KERN_WARNING "MPS support code is not built-in.\n"
1626 "Using acpi=off or acpi=noirq or pci=noacpi "
1627 "may have problem\n");
1634 #ifdef CONFIG_X86_IO_APIC
1635 static int __init parse_acpi_skip_timer_override(char *arg)
1637 acpi_skip_timer_override = 1;
1640 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1642 static int __init parse_acpi_use_timer_override(char *arg)
1644 acpi_use_timer_override = 1;
1647 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1648 #endif /* CONFIG_X86_IO_APIC */
1650 static int __init setup_acpi_sci(char *s)
1654 if (!strcmp(s, "edge"))
1655 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE |
1656 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1657 else if (!strcmp(s, "level"))
1658 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1659 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1660 else if (!strcmp(s, "high"))
1661 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1662 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1663 else if (!strcmp(s, "low"))
1664 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1665 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1670 early_param("acpi_sci", setup_acpi_sci);
1672 int __acpi_acquire_global_lock(unsigned int *lock)
1674 unsigned int old, new, val;
1677 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1678 val = cmpxchg(lock, old, new);
1679 } while (unlikely (val != old));
1680 return (new < 3) ? -1 : 0;
1683 int __acpi_release_global_lock(unsigned int *lock)
1685 unsigned int old, new, val;
1689 val = cmpxchg(lock, old, new);
1690 } while (unlikely (val != old));
1694 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1696 e820_add_region(addr, size, E820_ACPI);