acpi.c

来自「linux-2.4.29操作系统的源码」· C语言 代码 · 共 780 行 · 第 1/2 页

/*
 *  acpi.c - Architecture-Specific Low-Level ACPI Support
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[e-mail]>
 *  Copyright (C) 2001 Jun Nakajima <[e-mail]>
 *  Copyright (C) 2001 Patrick Mochel <[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/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/bootmem.h>
#include <linux/irq.h>
#include <linux/acpi.h>
#include <asm/mpspec.h>
#include <asm/io.h>
#include <asm/apic.h>
#include <asm/apicdef.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/io_apic.h>
#include <asm/acpi.h>
#include <asm/save_state.h>
#include <asm/smpboot.h>


#define PREFIX			"ACPI: "

int acpi_lapic;
int acpi_ioapic;
int acpi_strict;

acpi_interrupt_flags acpi_sci_flags __initdata;
int acpi_sci_override_gsi __initdata;
/* --------------------------------------------------------------------------
                              Boot-time Configuration
   -------------------------------------------------------------------------- */

#ifdef CONFIG_ACPI_PCI
int acpi_noirq __initdata;	/* skip ACPI IRQ initialization */
int acpi_pci_disabled __initdata; /* skip ACPI PCI scan and IRQ initialization */
#endif
int acpi_ht __initdata = 1;     /* enable HT */

enum acpi_irq_model_id		acpi_irq_model;


/*
 * 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 0;	/* cannot handle this */
		phys += PAGE_SIZE;
		set_fixmap(idx, phys);
		mapped_size += PAGE_SIZE;
	}

	return ((unsigned char *) base + offset);
}

#ifdef CONFIG_ACPI_MMCONFIG

u32 pci_mmcfg_base_addr;

static int __init 
acpi_parse_mcfg(unsigned long phys_addr,
		unsigned long size)
{
	struct acpi_table_mcfg *mcfg = NULL;

	if (!phys_addr || !size)
		return -EINVAL;

	mcfg = (struct acpi_table_mcfg *) __acpi_map_table(phys_addr, size);
	if (!mcfg) {
		printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
		return -ENODEV;
	}

	if (mcfg->base_reserved) {
		printk(KERN_ERR PREFIX "MMCONFIG not in low 4GB of memory\n");
		return -ENODEV;
	}

	pci_mmcfg_base_addr = mcfg->base_address;

	return 0;
}
#endif /* CONFIG_ACPI_MMCONFIG */

#ifdef CONFIG_X86_LOCAL_APIC

static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;


static int __init
acpi_parse_madt (
	unsigned long		phys_addr,
	unsigned long		size)
{
	struct acpi_table_madt	*madt = NULL;

	if (!phys_addr || !size)
		return -EINVAL;

	madt = (struct acpi_table_madt *) __acpi_map_table(phys_addr, size);
	if (!madt) {
		printk(KERN_WARNING PREFIX "Unable to map MADT\n");
		return -ENODEV;
	}

	if (madt->lapic_address)
		acpi_lapic_addr = (u64) madt->lapic_address;

	printk(KERN_INFO PREFIX "Local APIC address 0x%08x\n",
		madt->lapic_address);

	detect_clustered_apic(madt->header.oem_id, madt->header.oem_table_id);

	return 0;
}


static int __init
acpi_parse_lapic (
	acpi_table_entry_header *header)
{
	struct acpi_table_lapic	*processor = NULL;

	processor = (struct acpi_table_lapic*) header;
	if (!processor)
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	mp_register_lapic (
		processor->id,					   /* APIC ID */
		processor->flags.enabled);			  /* Enabled? */

	return 0;
}


static int __init
acpi_parse_lapic_addr_ovr (
	acpi_table_entry_header *header)
{
	struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;

	lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr*) header;
	if (!lapic_addr_ovr)
		return -EINVAL;

	acpi_lapic_addr = lapic_addr_ovr->address;

	return 0;
}

static int __init
acpi_parse_lapic_nmi (
	acpi_table_entry_header *header)
{
	struct acpi_table_lapic_nmi *lapic_nmi = NULL;

	lapic_nmi = (struct acpi_table_lapic_nmi*) header;
	if (!lapic_nmi)
		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*/

#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)

static int __init
acpi_parse_ioapic (
	acpi_table_entry_header *header)
{
	struct acpi_table_ioapic *ioapic = NULL;

	ioapic = (struct acpi_table_ioapic*) header;
	if (!ioapic)
		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
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.trigger)
		trigger = acpi_sci_flags.trigger;

	if (acpi_sci_flags.polarity)
		polarity = acpi_sci_flags.polarity;

	/*
 	 * 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_fadt
	 */
	acpi_sci_override_gsi = gsi;
	return;
}

static int __init
acpi_parse_fadt(unsigned long phys, unsigned long size)
{
        struct fadt_descriptor_rev2 *fadt =0;

        fadt = (struct fadt_descriptor_rev2*) __acpi_map_table(phys,size);
        if (!fadt) {
                printk(KERN_WARNING PREFIX "Unable to map FADT\n");
                return 0;
        }

#ifdef  CONFIG_ACPI_INTERPRETER
        /* initialize sci_int early for INT_SRC_OVR MADT parsing */
        acpi_fadt.sci_int = fadt->sci_int;
#endif

        return 0;
}


static int __init
acpi_parse_int_src_ovr (
	acpi_table_entry_header *header)
{
	struct acpi_table_int_src_ovr *intsrc = NULL;

	intsrc = (struct acpi_table_int_src_ovr*) header;
	if (!intsrc)
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	if (intsrc->bus_irq == acpi_fadt.sci_int) {
		acpi_sci_ioapic_setup(intsrc->global_irq,
			intsrc->flags.polarity, intsrc->flags.trigger);
		return 0;
	}

	mp_override_legacy_irq (
		intsrc->bus_irq,
		intsrc->flags.polarity,
		intsrc->flags.trigger,
		intsrc->global_irq);

	return 0;
}


static int __init
acpi_parse_nmi_src (
	acpi_table_entry_header *header)
{
	struct acpi_table_nmi_src *nmi_src = NULL;

	nmi_src = (struct acpi_table_nmi_src*) header;
	if (!nmi_src)
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	/* TBD: Support nimsrc entries? */

	return 0;
}

#endif /*CONFIG_X86_IO_APIC && CONFIG_ACPI_INTERPRETER*/


static unsigned long __init
acpi_scan_rsdp (
	unsigned long		start,
	unsigned long		length)
{
	unsigned long		offset = 0;
	unsigned long		sig_len = sizeof("RSD PTR ") - 1;

	/*
	 * Scan all 16-byte boundaries of the physical memory region for the
	 * RSDP signature.
	 */
	for (offset = 0; offset < length; offset += 16) {
		if (strncmp((char *) (start + offset), "RSD PTR ", sig_len))
			continue;
		return (start + offset);
	}

	return 0;
}


unsigned long __init
acpi_find_rsdp (void)
{
	unsigned long		rsdp_phys = 0;

	/*
	 * Scan memory looking for the RSDP signature. First search EBDA (low
	 * memory) paragraphs and then search upper memory (E0000-FFFFF).
	 */
	rsdp_phys = acpi_scan_rsdp (0, 0x400);
	if (!rsdp_phys)
		rsdp_phys = acpi_scan_rsdp (0xE0000, 0xFFFFF);

	return rsdp_phys;
}