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 <asm/pgalloc.h>
32 #include <asm/io_apic.h>
36 #include <asm/mpspec.h>
40 static inline void acpi_madt_oem_check(char *oem_id, char *oem_table_id) { }
41 static inline void clustered_apic_check(void) { }
42 static inline int ioapic_setup_disabled(void) { return 0; }
43 #include <asm/proto.h>
47 #ifdef CONFIG_X86_LOCAL_APIC
48 #include <mach_apic.h>
49 #include <mach_mpparse.h>
50 #endif /* CONFIG_X86_LOCAL_APIC */
54 #define PREFIX "ACPI: "
56 #ifdef CONFIG_ACPI_PCI
57 int acpi_noirq __initdata; /* skip ACPI IRQ initialization */
58 int acpi_pci_disabled __initdata; /* skip ACPI PCI scan and IRQ initialization */
60 int acpi_noirq __initdata = 1;
61 int acpi_pci_disabled __initdata = 1;
63 int acpi_ht __initdata = 1; /* enable HT */
69 acpi_interrupt_flags acpi_sci_flags __initdata;
70 int acpi_sci_override_gsi __initdata;
71 int acpi_skip_timer_override __initdata;
73 #ifdef CONFIG_X86_LOCAL_APIC
74 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
77 #ifndef __HAVE_ARCH_CMPXCHG
78 #warning ACPI uses CMPXCHG, i486 and later hardware
81 /* --------------------------------------------------------------------------
82 Boot-time Configuration
83 -------------------------------------------------------------------------- */
86 * The default interrupt routing model is PIC (8259). This gets
87 * overriden if IOAPICs are enumerated (below).
89 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
93 /* rely on all ACPI tables being in the direct mapping */
94 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
96 if (!phys_addr || !size)
99 if (phys_addr < (end_pfn_map << PAGE_SHIFT))
100 return __va(phys_addr);
108 * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
109 * to map the target physical address. The problem is that set_fixmap()
110 * provides a single page, and it is possible that the page is not
112 * By using this area, we can map up to MAX_IO_APICS pages temporarily,
113 * i.e. until the next __va_range() call.
115 * Important Safety Note: The fixed I/O APIC page numbers are *subtracted*
116 * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and
117 * count idx down while incrementing the phys address.
119 char *__acpi_map_table(unsigned long phys, unsigned long size)
121 unsigned long base, offset, mapped_size;
124 if (phys + size < 8*1024*1024)
127 offset = phys & (PAGE_SIZE - 1);
128 mapped_size = PAGE_SIZE - offset;
129 set_fixmap(FIX_ACPI_END, phys);
130 base = fix_to_virt(FIX_ACPI_END);
133 * Most cases can be covered by the below.
136 while (mapped_size < size) {
137 if (--idx < FIX_ACPI_BEGIN)
138 return 0; /* cannot handle this */
140 set_fixmap(idx, phys);
141 mapped_size += PAGE_SIZE;
144 return ((unsigned char *) base + offset);
148 #ifdef CONFIG_PCI_MMCONFIG
149 static int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
151 struct acpi_table_mcfg *mcfg;
153 if (!phys_addr || !size)
156 mcfg = (struct acpi_table_mcfg *) __acpi_map_table(phys_addr, size);
158 printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
162 if (mcfg->base_reserved) {
163 printk(KERN_ERR PREFIX "MMCONFIG not in low 4GB of memory\n");
167 pci_mmcfg_base_addr = mcfg->base_address;
172 #define acpi_parse_mcfg NULL
173 #endif /* !CONFIG_PCI_MMCONFIG */
175 #ifdef CONFIG_X86_LOCAL_APIC
178 unsigned long phys_addr,
181 struct acpi_table_madt *madt = NULL;
183 if (!phys_addr || !size)
186 madt = (struct acpi_table_madt *) __acpi_map_table(phys_addr, size);
188 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
192 if (madt->lapic_address) {
193 acpi_lapic_addr = (u64) madt->lapic_address;
195 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
196 madt->lapic_address);
199 acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
207 acpi_table_entry_header *header)
209 struct acpi_table_lapic *processor = NULL;
211 processor = (struct acpi_table_lapic*) header;
215 acpi_table_print_madt_entry(header);
217 /* no utility in registering a disabled processor */
218 if (processor->flags.enabled == 0)
222 processor->id, /* APIC ID */
223 processor->flags.enabled); /* Enabled? */
230 acpi_parse_lapic_addr_ovr (
231 acpi_table_entry_header *header)
233 struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;
235 lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr*) header;
239 acpi_lapic_addr = lapic_addr_ovr->address;
245 acpi_parse_lapic_nmi (
246 acpi_table_entry_header *header)
248 struct acpi_table_lapic_nmi *lapic_nmi = NULL;
250 lapic_nmi = (struct acpi_table_lapic_nmi*) header;
254 acpi_table_print_madt_entry(header);
256 if (lapic_nmi->lint != 1)
257 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
263 #endif /*CONFIG_X86_LOCAL_APIC*/
265 #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)
269 acpi_table_entry_header *header)
271 struct acpi_table_ioapic *ioapic = NULL;
273 ioapic = (struct acpi_table_ioapic*) header;
277 acpi_table_print_madt_entry(header);
282 ioapic->global_irq_base);
288 * Parse Interrupt Source Override for the ACPI SCI
291 acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
293 if (trigger == 0) /* compatible SCI trigger is level */
296 if (polarity == 0) /* compatible SCI polarity is low */
299 /* Command-line over-ride via acpi_sci= */
300 if (acpi_sci_flags.trigger)
301 trigger = acpi_sci_flags.trigger;
303 if (acpi_sci_flags.polarity)
304 polarity = acpi_sci_flags.polarity;
307 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
308 * If GSI is < 16, this will update its flags,
309 * else it will create a new mp_irqs[] entry.
311 mp_override_legacy_irq(gsi, polarity, trigger, gsi);
314 * stash over-ride to indicate we've been here
315 * and for later update of acpi_fadt
317 acpi_sci_override_gsi = gsi;
322 acpi_parse_int_src_ovr (
323 acpi_table_entry_header *header)
325 struct acpi_table_int_src_ovr *intsrc = NULL;
327 intsrc = (struct acpi_table_int_src_ovr*) header;
331 acpi_table_print_madt_entry(header);
333 if (intsrc->bus_irq == acpi_fadt.sci_int) {
334 acpi_sci_ioapic_setup(intsrc->global_irq,
335 intsrc->flags.polarity, intsrc->flags.trigger);
339 if (acpi_skip_timer_override &&
340 intsrc->bus_irq == 0 && intsrc->global_irq == 2) {
341 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
345 mp_override_legacy_irq (
347 intsrc->flags.polarity,
348 intsrc->flags.trigger,
357 acpi_table_entry_header *header)
359 struct acpi_table_nmi_src *nmi_src = NULL;
361 nmi_src = (struct acpi_table_nmi_src*) header;
365 acpi_table_print_madt_entry(header);
367 /* TBD: Support nimsrc entries? */
372 #endif /* CONFIG_X86_IO_APIC */
374 #ifdef CONFIG_ACPI_BUS
377 * acpi_pic_sci_set_trigger()
379 * use ELCR to set PIC-mode trigger type for SCI
381 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
382 * it may require Edge Trigger -- use "acpi_sci=edge"
384 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
385 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge.
386 * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
387 * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
391 acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
393 unsigned char mask = 1 << (irq & 7);
394 unsigned int port = 0x4d0 + (irq >> 3);
395 unsigned char val = inb(port);
398 printk(PREFIX "IRQ%d SCI:", irq);
403 printk(" set to Level");
404 outb(val | mask, port);
410 printk(" set to Edge");
411 outb(val & ~mask, port);
414 printk(" Trigger.\n");
418 #endif /* CONFIG_ACPI_BUS */
420 #ifdef CONFIG_X86_IO_APIC
421 /* deprecated in favor of acpi_gsi_to_irq */
422 int acpi_irq_to_vector(u32 irq)
424 if (use_pci_vector() && !platform_legacy_irq(irq))
425 irq = IO_APIC_VECTOR(irq);
430 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
432 #ifdef CONFIG_X86_IO_APIC
433 if (use_pci_vector() && !platform_legacy_irq(gsi))
434 *irq = IO_APIC_VECTOR(gsi);
441 static unsigned long __init
444 unsigned long length)
446 unsigned long offset = 0;
447 unsigned long sig_len = sizeof("RSD PTR ") - 1;
450 * Scan all 16-byte boundaries of the physical memory region for the
453 for (offset = 0; offset < length; offset += 16) {
454 if (strncmp((char *) (start + offset), "RSD PTR ", sig_len))
456 return (start + offset);
462 static int __init acpi_parse_sbf(unsigned long phys_addr, unsigned long size)
464 struct acpi_table_sbf *sb;
466 if (!phys_addr || !size)
469 sb = (struct acpi_table_sbf *) __acpi_map_table(phys_addr, size);
471 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
475 sbf_port = sb->sbf_cmos; /* Save CMOS port */
481 #ifdef CONFIG_HPET_TIMER
483 static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
485 struct acpi_table_hpet *hpet_tbl;
490 hpet_tbl = (struct acpi_table_hpet *) __acpi_map_table(phys, size);
492 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
496 if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
497 printk(KERN_WARNING PREFIX "HPET timers must be located in "
503 vxtime.hpet_address = hpet_tbl->addr.addrl |
504 ((long) hpet_tbl->addr.addrh << 32);
506 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
507 hpet_tbl->id, vxtime.hpet_address);
510 extern unsigned long hpet_address;
512 hpet_address = hpet_tbl->addr.addrl;
513 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
514 hpet_tbl->id, hpet_address);
521 #define acpi_parse_hpet NULL
524 #ifdef CONFIG_X86_PM_TIMER
525 extern u32 pmtmr_ioport;
528 static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
530 struct fadt_descriptor_rev2 *fadt =0;
532 fadt = (struct fadt_descriptor_rev2*) __acpi_map_table(phys,size);
534 printk(KERN_WARNING PREFIX "Unable to map FADT\n");
538 #ifdef CONFIG_ACPI_INTERPRETER
539 /* initialize sci_int early for INT_SRC_OVR MADT parsing */
540 acpi_fadt.sci_int = fadt->sci_int;
543 #ifdef CONFIG_X86_PM_TIMER
544 /* detect the location of the ACPI PM Timer */
545 if (fadt->revision >= FADT2_REVISION_ID) {
547 if (fadt->xpm_tmr_blk.address_space_id != ACPI_ADR_SPACE_SYSTEM_IO)
550 pmtmr_ioport = fadt->xpm_tmr_blk.address;
553 pmtmr_ioport = fadt->V1_pm_tmr_blk;
556 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n", pmtmr_ioport);
563 acpi_find_rsdp (void)
565 unsigned long rsdp_phys = 0;
569 return __pa(efi.acpi20);
571 return __pa(efi.acpi);
574 * Scan memory looking for the RSDP signature. First search EBDA (low
575 * memory) paragraphs and then search upper memory (E0000-FFFFF).
577 rsdp_phys = acpi_scan_rsdp (0, 0x400);
579 rsdp_phys = acpi_scan_rsdp (0xE0000, 0xFFFFF);
584 #ifdef CONFIG_X86_LOCAL_APIC
586 * Parse LAPIC entries in MADT
587 * returns 0 on success, < 0 on error
590 acpi_parse_madt_lapic_entries(void)
595 * Note that the LAPIC address is obtained from the MADT (32-bit value)
596 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
599 count = acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR, acpi_parse_lapic_addr_ovr, 0);
601 printk(KERN_ERR PREFIX "Error parsing LAPIC address override entry\n");
605 mp_register_lapic_address(acpi_lapic_addr);
607 count = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic,
610 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
611 /* TBD: Cleanup to allow fallback to MPS */
614 else if (count < 0) {
615 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
616 /* TBD: Cleanup to allow fallback to MPS */
620 count = acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0);
622 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
623 /* TBD: Cleanup to allow fallback to MPS */
628 #endif /* CONFIG_X86_LOCAL_APIC */
630 #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)
632 * Parse IOAPIC related entries in MADT
633 * returns 0 on success, < 0 on error
636 acpi_parse_madt_ioapic_entries(void)
641 * ACPI interpreter is required to complete interrupt setup,
642 * so if it is off, don't enumerate the io-apics with ACPI.
643 * If MPS is present, it will handle them,
644 * otherwise the system will stay in PIC mode
646 if (acpi_disabled || acpi_noirq) {
651 * if "noapic" boot option, don't look for IO-APICs
653 if (skip_ioapic_setup) {
654 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
655 "due to 'noapic' option.\n");
659 count = acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic, MAX_IO_APICS);
661 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
664 else if (count < 0) {
665 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
669 count = acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr, NR_IRQ_VECTORS);
671 printk(KERN_ERR PREFIX "Error parsing interrupt source overrides entry\n");
672 /* TBD: Cleanup to allow fallback to MPS */
677 * If BIOS did not supply an INT_SRC_OVR for the SCI
678 * pretend we got one so we can set the SCI flags.
680 if (!acpi_sci_override_gsi)
681 acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
683 /* Fill in identity legacy mapings where no override */
684 mp_config_acpi_legacy_irqs();
686 count = acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src, NR_IRQ_VECTORS);
688 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
689 /* TBD: Cleanup to allow fallback to MPS */
696 static inline int acpi_parse_madt_ioapic_entries(void)
700 #endif /* !(CONFIG_X86_IO_APIC && CONFIG_ACPI_INTERPRETER) */
704 acpi_process_madt(void)
706 #ifdef CONFIG_X86_LOCAL_APIC
709 count = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
713 * Parse MADT LAPIC entries
715 error = acpi_parse_madt_lapic_entries();
720 * Parse MADT IO-APIC entries
722 error = acpi_parse_madt_ioapic_entries();
724 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
725 acpi_irq_balance_set(NULL);
728 smp_found_config = 1;
729 clustered_apic_check();
739 * called from setup_arch(), always.
740 * 1. checksums all tables
741 * 2. enumerates lapics
742 * 3. enumerates io-apics
745 * acpi_lapic = 1 if LAPIC found
746 * acpi_ioapic = 1 if IOAPIC found
747 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
748 * if acpi_blacklisted() acpi_disabled = 1;
752 * return value: (currently ignored)
758 acpi_boot_init (void)
763 * If acpi_disabled, bail out
764 * One exception: acpi=ht continues far enough to enumerate LAPICs
766 if (acpi_disabled && !acpi_ht)
770 * Initialize the ACPI boot-time table parser.
772 error = acpi_table_init();
778 acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
781 * blacklist may disable ACPI entirely
783 error = acpi_blacklisted();
785 printk(KERN_WARNING PREFIX "BIOS listed in blacklist, disabling ACPI support\n");
791 * set sci_int and PM timer address
793 acpi_table_parse(ACPI_FADT, acpi_parse_fadt);
796 * Process the Multiple APIC Description Table (MADT), if present
800 acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
801 acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);