boot.c

linux内核源码

/*
 *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[e-mail]>
 *  Copyright (C) 2001 Jun Nakajima <[e-mail]>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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>

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>

static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }


#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 __initdata;	/* skip ACPI PCI scan and IRQ initialization */
int acpi_ht __initdata = 1;	/* enable HT */

int acpi_lapic;
int acpi_ioapic;
int acpi_strict;
EXPORT_SYMBOL(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 *__acpi_map_table(unsigned long phys_addr, unsigned long size)
{
	if (!phys_addr || !size)
		return NULL;

	if (phys_addr+size <= (end_pfn_map << 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 *__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 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.
	 */
	mp_register_lapic(processor->id,	/* APIC ID */
			  processor->lapic_flags & ACPI_MADT_ENABLED);	/* Enabled? */

	return 0;
}

static int __init
acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
			  const unsigned long end)
{
	struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;

	lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;

	if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
		return -EINVAL;

	acpi_lapic_addr = lapic_addr_ovr->address;

	return 0;
}

static int __init
acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
{
	struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;

	lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;

	if (BAD_MADT_ENTRY(lapic_nmi, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	if (lapic_nmi->lint != 1)
		printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");

	return 0;
}

#endif				/*CONFIG_X86_LOCAL_APIC */

#ifdef CONFIG_X86_IO_APIC

static int __init
acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
{
	struct acpi_madt_io_apic *ioapic = NULL;

	ioapic = (struct acpi_madt_io_apic *)header;

	if (BAD_MADT_ENTRY(ioapic, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	mp_register_ioapic(ioapic->id,
			   ioapic->address, ioapic->global_irq_base);

	return 0;
}

/*
 * Parse Interrupt Source Override for the ACPI SCI
 */
static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
{
	if (trigger == 0)	/* compatible SCI trigger is level */
		trigger = 3;

	if (polarity == 0)	/* compatible SCI polarity is low */
		polarity = 3;

	/* Command-line over-ride via acpi_sci= */
	if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
		trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;

	if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
		polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;

	/*
	 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
	 * If GSI is < 16, this will update its flags,
	 * else it will create a new mp_irqs[] entry.
	 */
	mp_override_legacy_irq(gsi, polarity, trigger, gsi);

	/*
	 * stash over-ride to indicate we've been here
	 * and for later update of acpi_gbl_FADT
	 */
	acpi_sci_override_gsi = gsi;
	return;
}

static int __init
acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
		       const unsigned long end)
{
	struct acpi_madt_interrupt_override *intsrc = NULL;

	intsrc = (struct acpi_madt_interrupt_override *)header;

	if (BAD_MADT_ENTRY(intsrc, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
		acpi_sci_ioapic_setup(intsrc->global_irq,
				      intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
				      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
		return 0;
	}

	if (acpi_skip_timer_override &&
	    intsrc->source_irq == 0 && intsrc->global_irq == 2) {
		printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
		return 0;
	}

	mp_override_legacy_irq(intsrc->source_irq,
				intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
				(intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
				intsrc->global_irq);

	return 0;
}

static int __init
acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
{
	struct acpi_madt_nmi_source *nmi_src = NULL;

	nmi_src = (struct acpi_madt_nmi_source *)header;

	if (BAD_MADT_ENTRY(nmi_src, end))
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	/* TBD: Support nimsrc entries? */

	return 0;
}

#endif				/* CONFIG_X86_IO_APIC */

/*
 * acpi_pic_sci_set_trigger()
 *
 * use ELCR to set PIC-mode trigger type for SCI
 *
 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 * it may require Edge Trigger -- use "acpi_sci=edge"
 *
 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
 */

void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
{
	unsigned int mask = 1 << irq;
	unsigned int old, new;

	/* Real old ELCR mask */
	old = inb(0x4d0) | (inb(0x4d1) << 8);

	/*
	 * If we use ACPI to set PCI IRQs, then we should clear ELCR
	 * since we will set it correctly as we enable the PCI irq
	 * routing.
	 */
	new = acpi_noirq ? old : 0;

	/*
	 * Update SCI information in the ELCR, it isn't in the PCI
	 * routing tables..
	 */
	switch (trigger) {
	case 1:		/* Edge - clear */
		new &= ~mask;
		break;
	case 3:		/* Level - set */
		new |= mask;
		break;
	}

	if (old == new)
		return;

	printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
	outb(new, 0x4d0);