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/config.h>
28 #include <linux/acpi.h>
29 #include <linux/efi.h>
30 #include <linux/irq.h>
31 #include <linux/module.h>
33 #include <asm/pgtable.h>
34 #include <asm/io_apic.h>
38 #include <asm/mpspec.h>
42 static inline void acpi_madt_oem_check(char *oem_id, char *oem_table_id) { }
43 extern void __init clustered_apic_check(void);
44 static inline int ioapic_setup_disabled(void) { return 0; }
45 #include <asm/proto.h>
49 #ifdef CONFIG_X86_LOCAL_APIC
50 #include <mach_apic.h>
51 #include <mach_mpparse.h>
52 #endif /* CONFIG_X86_LOCAL_APIC */
56 #define BAD_MADT_ENTRY(entry, end) ( \
57 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
58 ((acpi_table_entry_header *)entry)->length != sizeof(*entry))
60 #define PREFIX "ACPI: "
62 #ifdef CONFIG_ACPI_PCI
63 int acpi_noirq __initdata; /* skip ACPI IRQ initialization */
64 int acpi_pci_disabled __initdata; /* skip ACPI PCI scan and IRQ initialization */
66 int acpi_noirq __initdata = 1;
67 int acpi_pci_disabled __initdata = 1;
69 int acpi_ht __initdata = 1; /* enable HT */
74 EXPORT_SYMBOL(acpi_strict);
76 acpi_interrupt_flags acpi_sci_flags __initdata;
77 int acpi_sci_override_gsi __initdata;
78 int acpi_skip_timer_override __initdata;
80 #ifdef CONFIG_X86_LOCAL_APIC
81 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
84 #ifndef __HAVE_ARCH_CMPXCHG
85 #warning ACPI uses CMPXCHG, i486 and later hardware
88 #define MAX_MADT_ENTRIES 256
89 u8 x86_acpiid_to_apicid[MAX_MADT_ENTRIES] =
90 { [0 ... MAX_MADT_ENTRIES-1] = 0xff };
91 EXPORT_SYMBOL(x86_acpiid_to_apicid);
93 /* --------------------------------------------------------------------------
94 Boot-time Configuration
95 -------------------------------------------------------------------------- */
98 * The default interrupt routing model is PIC (8259). This gets
99 * overriden if IOAPICs are enumerated (below).
101 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
105 /* rely on all ACPI tables being in the direct mapping */
106 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
108 if (!phys_addr || !size)
111 if (phys_addr < (end_pfn_map << PAGE_SHIFT))
112 return __va(phys_addr);
120 * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
121 * to map the target physical address. The problem is that set_fixmap()
122 * provides a single page, and it is possible that the page is not
124 * By using this area, we can map up to MAX_IO_APICS pages temporarily,
125 * i.e. until the next __va_range() call.
127 * Important Safety Note: The fixed I/O APIC page numbers are *subtracted*
128 * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and
129 * count idx down while incrementing the phys address.
131 char *__acpi_map_table(unsigned long phys, unsigned long size)
133 unsigned long base, offset, mapped_size;
136 if (phys + size < 8*1024*1024)
139 offset = phys & (PAGE_SIZE - 1);
140 mapped_size = PAGE_SIZE - offset;
141 set_fixmap(FIX_ACPI_END, phys);
142 base = fix_to_virt(FIX_ACPI_END);
145 * Most cases can be covered by the below.
148 while (mapped_size < size) {
149 if (--idx < FIX_ACPI_BEGIN)
150 return NULL; /* cannot handle this */
152 set_fixmap(idx, phys);
153 mapped_size += PAGE_SIZE;
156 return ((unsigned char *) base + offset);
160 #ifdef CONFIG_PCI_MMCONFIG
161 static int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
163 struct acpi_table_mcfg *mcfg;
165 if (!phys_addr || !size)
168 mcfg = (struct acpi_table_mcfg *) __acpi_map_table(phys_addr, size);
170 printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
174 if (mcfg->base_reserved) {
175 printk(KERN_ERR PREFIX "MMCONFIG not in low 4GB of memory\n");
179 pci_mmcfg_base_addr = mcfg->base_address;
184 #define acpi_parse_mcfg NULL
185 #endif /* !CONFIG_PCI_MMCONFIG */
187 #ifdef CONFIG_X86_LOCAL_APIC
190 unsigned long phys_addr,
193 struct acpi_table_madt *madt = NULL;
195 if (!phys_addr || !size)
198 madt = (struct acpi_table_madt *) __acpi_map_table(phys_addr, size);
200 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
204 if (madt->lapic_address) {
205 acpi_lapic_addr = (u64) madt->lapic_address;
207 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
208 madt->lapic_address);
211 acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
219 acpi_table_entry_header *header, const unsigned long end)
221 struct acpi_table_lapic *processor = NULL;
223 processor = (struct acpi_table_lapic*) header;
225 if (BAD_MADT_ENTRY(processor, end))
228 acpi_table_print_madt_entry(header);
230 /* no utility in registering a disabled processor */
231 if (processor->flags.enabled == 0)
234 x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
237 processor->id, /* APIC ID */
238 processor->flags.enabled); /* Enabled? */
244 acpi_parse_lapic_addr_ovr (
245 acpi_table_entry_header *header, const unsigned long end)
247 struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;
249 lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr*) header;
251 if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
254 acpi_lapic_addr = lapic_addr_ovr->address;
260 acpi_parse_lapic_nmi (
261 acpi_table_entry_header *header, const unsigned long end)
263 struct acpi_table_lapic_nmi *lapic_nmi = NULL;
265 lapic_nmi = (struct acpi_table_lapic_nmi*) header;
267 if (BAD_MADT_ENTRY(lapic_nmi, end))
270 acpi_table_print_madt_entry(header);
272 if (lapic_nmi->lint != 1)
273 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
279 #endif /*CONFIG_X86_LOCAL_APIC*/
281 #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)
285 acpi_table_entry_header *header, const unsigned long end)
287 struct acpi_table_ioapic *ioapic = NULL;
289 ioapic = (struct acpi_table_ioapic*) header;
291 if (BAD_MADT_ENTRY(ioapic, end))
294 acpi_table_print_madt_entry(header);
299 ioapic->global_irq_base);
305 * Parse Interrupt Source Override for the ACPI SCI
308 acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
310 if (trigger == 0) /* compatible SCI trigger is level */
313 if (polarity == 0) /* compatible SCI polarity is low */
316 /* Command-line over-ride via acpi_sci= */
317 if (acpi_sci_flags.trigger)
318 trigger = acpi_sci_flags.trigger;
320 if (acpi_sci_flags.polarity)
321 polarity = acpi_sci_flags.polarity;
324 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
325 * If GSI is < 16, this will update its flags,
326 * else it will create a new mp_irqs[] entry.
328 mp_override_legacy_irq(gsi, polarity, trigger, gsi);
331 * stash over-ride to indicate we've been here
332 * and for later update of acpi_fadt
334 acpi_sci_override_gsi = gsi;
339 acpi_parse_int_src_ovr (
340 acpi_table_entry_header *header, const unsigned long end)
342 struct acpi_table_int_src_ovr *intsrc = NULL;
344 intsrc = (struct acpi_table_int_src_ovr*) header;
346 if (BAD_MADT_ENTRY(intsrc, end))
349 acpi_table_print_madt_entry(header);
351 if (intsrc->bus_irq == acpi_fadt.sci_int) {
352 acpi_sci_ioapic_setup(intsrc->global_irq,
353 intsrc->flags.polarity, intsrc->flags.trigger);
357 if (acpi_skip_timer_override &&
358 intsrc->bus_irq == 0 && intsrc->global_irq == 2) {
359 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
363 mp_override_legacy_irq (
365 intsrc->flags.polarity,
366 intsrc->flags.trigger,
375 acpi_table_entry_header *header, const unsigned long end)
377 struct acpi_table_nmi_src *nmi_src = NULL;
379 nmi_src = (struct acpi_table_nmi_src*) header;
381 if (BAD_MADT_ENTRY(nmi_src, end))
384 acpi_table_print_madt_entry(header);
386 /* TBD: Support nimsrc entries? */
391 #endif /* CONFIG_X86_IO_APIC */
393 #ifdef CONFIG_ACPI_BUS
396 * acpi_pic_sci_set_trigger()
398 * use ELCR to set PIC-mode trigger type for SCI
400 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
401 * it may require Edge Trigger -- use "acpi_sci=edge"
403 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
404 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
405 * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
406 * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
410 acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
412 unsigned int mask = 1 << irq;
413 unsigned int old, new;
415 /* Real old ELCR mask */
416 old = inb(0x4d0) | (inb(0x4d1) << 8);
419 * If we use ACPI to set PCI irq's, then we should clear ELCR
420 * since we will set it correctly as we enable the PCI irq
423 new = acpi_noirq ? old : 0;
426 * Update SCI information in the ELCR, it isn't in the PCI
430 case 1: /* Edge - clear */
433 case 3: /* Level - set */
441 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
443 outb(new >> 8, 0x4d1);
447 #endif /* CONFIG_ACPI_BUS */
449 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
451 #ifdef CONFIG_X86_IO_APIC
452 if (use_pci_vector() && !platform_legacy_irq(gsi))
453 *irq = IO_APIC_VECTOR(gsi);
460 unsigned int acpi_register_gsi(u32 gsi, int edge_level, int active_high_low)
463 unsigned int plat_gsi = gsi;
467 * Make sure all (legacy) PCI IRQs are set as level-triggered.
469 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
470 extern void eisa_set_level_irq(unsigned int irq);
472 if (edge_level == ACPI_LEVEL_SENSITIVE)
473 eisa_set_level_irq(gsi);
477 #ifdef CONFIG_X86_IO_APIC
478 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
479 plat_gsi = mp_register_gsi(gsi, edge_level, active_high_low);
482 acpi_gsi_to_irq(plat_gsi, &irq);
485 EXPORT_SYMBOL(acpi_register_gsi);
488 * ACPI based hotplug support for CPU
490 #ifdef CONFIG_ACPI_HOTPLUG_CPU
492 acpi_map_lsapic(acpi_handle handle, int *pcpu)
497 EXPORT_SYMBOL(acpi_map_lsapic);
501 acpi_unmap_lsapic(int cpu)
506 EXPORT_SYMBOL(acpi_unmap_lsapic);
507 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
509 static unsigned long __init
512 unsigned long length)
514 unsigned long offset = 0;
515 unsigned long sig_len = sizeof("RSD PTR ") - 1;
518 * Scan all 16-byte boundaries of the physical memory region for the
521 for (offset = 0; offset < length; offset += 16) {
522 if (strncmp((char *) (start + offset), "RSD PTR ", sig_len))
524 return (start + offset);
530 static int __init acpi_parse_sbf(unsigned long phys_addr, unsigned long size)
532 struct acpi_table_sbf *sb;
534 if (!phys_addr || !size)
537 sb = (struct acpi_table_sbf *) __acpi_map_table(phys_addr, size);
539 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
543 sbf_port = sb->sbf_cmos; /* Save CMOS port */
549 #ifdef CONFIG_HPET_TIMER
551 static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
553 struct acpi_table_hpet *hpet_tbl;
558 hpet_tbl = (struct acpi_table_hpet *) __acpi_map_table(phys, size);
560 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
564 if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
565 printk(KERN_WARNING PREFIX "HPET timers must be located in "
571 vxtime.hpet_address = hpet_tbl->addr.addrl |
572 ((long) hpet_tbl->addr.addrh << 32);
574 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
575 hpet_tbl->id, vxtime.hpet_address);
578 extern unsigned long hpet_address;
580 hpet_address = hpet_tbl->addr.addrl;
581 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
582 hpet_tbl->id, hpet_address);
589 #define acpi_parse_hpet NULL
592 #ifdef CONFIG_X86_PM_TIMER
593 extern u32 pmtmr_ioport;
596 static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
598 struct fadt_descriptor_rev2 *fadt = NULL;
600 fadt = (struct fadt_descriptor_rev2*) __acpi_map_table(phys,size);
602 printk(KERN_WARNING PREFIX "Unable to map FADT\n");
606 #ifdef CONFIG_ACPI_INTERPRETER
607 /* initialize sci_int early for INT_SRC_OVR MADT parsing */
608 acpi_fadt.sci_int = fadt->sci_int;
611 #ifdef CONFIG_ACPI_BUS
612 /* initialize rev and apic_phys_dest_mode for x86_64 genapic */
613 acpi_fadt.revision = fadt->revision;
614 acpi_fadt.force_apic_physical_destination_mode = fadt->force_apic_physical_destination_mode;
617 #ifdef CONFIG_X86_PM_TIMER
618 /* detect the location of the ACPI PM Timer */
619 if (fadt->revision >= FADT2_REVISION_ID) {
621 if (fadt->xpm_tmr_blk.address_space_id != ACPI_ADR_SPACE_SYSTEM_IO)
624 pmtmr_ioport = fadt->xpm_tmr_blk.address;
627 pmtmr_ioport = fadt->V1_pm_tmr_blk;
630 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n", pmtmr_ioport);
637 acpi_find_rsdp (void)
639 unsigned long rsdp_phys = 0;
643 return __pa(efi.acpi20);
645 return __pa(efi.acpi);
648 * Scan memory looking for the RSDP signature. First search EBDA (low
649 * memory) paragraphs and then search upper memory (E0000-FFFFF).
651 rsdp_phys = acpi_scan_rsdp (0, 0x400);
653 rsdp_phys = acpi_scan_rsdp (0xE0000, 0x20000);
658 #ifdef CONFIG_X86_LOCAL_APIC
660 * Parse LAPIC entries in MADT
661 * returns 0 on success, < 0 on error
664 acpi_parse_madt_lapic_entries(void)
669 * Note that the LAPIC address is obtained from the MADT (32-bit value)
670 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
673 count = acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR, acpi_parse_lapic_addr_ovr, 0);
675 printk(KERN_ERR PREFIX "Error parsing LAPIC address override entry\n");
679 mp_register_lapic_address(acpi_lapic_addr);
681 count = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic,
684 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
685 /* TBD: Cleanup to allow fallback to MPS */
688 else if (count < 0) {
689 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
690 /* TBD: Cleanup to allow fallback to MPS */
694 count = acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0);
696 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
697 /* TBD: Cleanup to allow fallback to MPS */
702 #endif /* CONFIG_X86_LOCAL_APIC */
704 #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)
706 * Parse IOAPIC related entries in MADT
707 * returns 0 on success, < 0 on error
710 acpi_parse_madt_ioapic_entries(void)
715 * ACPI interpreter is required to complete interrupt setup,
716 * so if it is off, don't enumerate the io-apics with ACPI.
717 * If MPS is present, it will handle them,
718 * otherwise the system will stay in PIC mode
720 if (acpi_disabled || acpi_noirq) {
725 * if "noapic" boot option, don't look for IO-APICs
727 if (skip_ioapic_setup) {
728 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
729 "due to 'noapic' option.\n");
733 count = acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic, MAX_IO_APICS);
735 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
738 else if (count < 0) {
739 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
743 count = acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr, NR_IRQ_VECTORS);
745 printk(KERN_ERR PREFIX "Error parsing interrupt source overrides entry\n");
746 /* TBD: Cleanup to allow fallback to MPS */
751 * If BIOS did not supply an INT_SRC_OVR for the SCI
752 * pretend we got one so we can set the SCI flags.
754 if (!acpi_sci_override_gsi)
755 acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
757 /* Fill in identity legacy mapings where no override */
758 mp_config_acpi_legacy_irqs();
760 count = acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src, NR_IRQ_VECTORS);
762 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
763 /* TBD: Cleanup to allow fallback to MPS */
770 static inline int acpi_parse_madt_ioapic_entries(void)
774 #endif /* !(CONFIG_X86_IO_APIC && CONFIG_ACPI_INTERPRETER) */
778 acpi_process_madt(void)
780 #ifdef CONFIG_X86_LOCAL_APIC
783 count = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
787 * Parse MADT LAPIC entries
789 error = acpi_parse_madt_lapic_entries();
794 * Parse MADT IO-APIC entries
796 error = acpi_parse_madt_ioapic_entries();
798 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
799 acpi_irq_balance_set(NULL);
802 smp_found_config = 1;
803 clustered_apic_check();
806 if (error == -EINVAL) {
808 * Dell Precision Workstation 410, 610 come here.
810 printk(KERN_ERR PREFIX "Invalid BIOS MADT, disabling ACPI\n");
819 * acpi_boot_table_init() and acpi_boot_init()
820 * called from setup_arch(), always.
821 * 1. checksums all tables
822 * 2. enumerates lapics
823 * 3. enumerates io-apics
825 * acpi_table_init() is separate to allow reading SRAT without
826 * other side effects.
828 * side effects of acpi_boot_init:
829 * acpi_lapic = 1 if LAPIC found
830 * acpi_ioapic = 1 if IOAPIC found
831 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
832 * if acpi_blacklisted() acpi_disabled = 1;
836 * return value: (currently ignored)
842 acpi_boot_table_init(void)
847 * If acpi_disabled, bail out
848 * One exception: acpi=ht continues far enough to enumerate LAPICs
850 if (acpi_disabled && !acpi_ht)
854 * Initialize the ACPI boot-time table parser.
856 error = acpi_table_init();
866 acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
869 * blacklist may disable ACPI entirely
871 error = acpi_blacklisted();
873 extern int acpi_force;
876 printk(KERN_WARNING PREFIX "acpi=force override\n");
878 printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
888 int __init acpi_boot_init(void)
891 * If acpi_disabled, bail out
892 * One exception: acpi=ht continues far enough to enumerate LAPICs
894 if (acpi_disabled && !acpi_ht)
897 acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
900 * set sci_int and PM timer address
902 acpi_table_parse(ACPI_FADT, acpi_parse_fadt);
905 * Process the Multiple APIC Description Table (MADT), if present
909 acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
910 acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);