boot.c

h内核

		*irq = gsi;
	return 0;
}

unsigned int acpi_register_gsi(u32 gsi, int edge_level, int active_high_low)
{
	unsigned int irq;
	unsigned int plat_gsi = gsi;

#ifdef CONFIG_PCI
	/*
	 * Make sure all (legacy) PCI IRQs are set as level-triggered.
	 */
	if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
		extern void eisa_set_level_irq(unsigned int irq);

		if (edge_level == ACPI_LEVEL_SENSITIVE)
				eisa_set_level_irq(gsi);
	}
#endif

#ifdef CONFIG_X86_IO_APIC
	if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
		plat_gsi = mp_register_gsi(gsi, edge_level, active_high_low);
	}
#endif
	acpi_gsi_to_irq(plat_gsi, &irq);
	return irq;
}
EXPORT_SYMBOL(acpi_register_gsi);

/*
 *  ACPI based hotplug support for CPU
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
int
acpi_map_lsapic(acpi_handle handle, int *pcpu)
{
	/* TBD */
	return -EINVAL;
}
EXPORT_SYMBOL(acpi_map_lsapic);


int
acpi_unmap_lsapic(int cpu)
{
	/* TBD */
	return -EINVAL;
}
EXPORT_SYMBOL(acpi_unmap_lsapic);
#endif /* CONFIG_ACPI_HOTPLUG_CPU */

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;
}

static int __init acpi_parse_sbf(unsigned long phys_addr, unsigned long size)
{
	struct acpi_table_sbf *sb;

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

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

	sbf_port = sb->sbf_cmos; /* Save CMOS port */

	return 0;
}


#ifdef CONFIG_HPET_TIMER

static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
{
	struct acpi_table_hpet *hpet_tbl;

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

	hpet_tbl = (struct acpi_table_hpet *) __acpi_map_table(phys, size);
	if (!hpet_tbl) {
		printk(KERN_WARNING PREFIX "Unable to map HPET\n");
		return -ENODEV;
	}

	if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
		printk(KERN_WARNING PREFIX "HPET timers must be located in "
		       "memory.\n");
		return -1;
	}

#ifdef	CONFIG_X86_64
        vxtime.hpet_address = hpet_tbl->addr.addrl |
                ((long) hpet_tbl->addr.addrh << 32);

        printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
               hpet_tbl->id, vxtime.hpet_address);
#else	/* X86 */
	{
		extern unsigned long hpet_address;

		hpet_address = hpet_tbl->addr.addrl;
		printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
			hpet_tbl->id, hpet_address);
	}
#endif	/* X86 */

	return 0;
}
#else
#define	acpi_parse_hpet	NULL
#endif

#ifdef CONFIG_X86_PM_TIMER
extern u32 pmtmr_ioport;
#endif

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

	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

#ifdef CONFIG_X86_PM_TIMER
	/* detect the location of the ACPI PM Timer */
	if (fadt->revision >= FADT2_REVISION_ID) {
		/* FADT rev. 2 */
		if (fadt->xpm_tmr_blk.address_space_id != ACPI_ADR_SPACE_SYSTEM_IO)
			return 0;

		pmtmr_ioport = fadt->xpm_tmr_blk.address;
	} else {
		/* FADT rev. 1 */
		pmtmr_ioport = fadt->V1_pm_tmr_blk;
	}
	if (pmtmr_ioport)
		printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n", pmtmr_ioport);
#endif
	return 0;
}


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

	if (efi_enabled) {
		if (efi.acpi20)
			return __pa(efi.acpi20);
		else if (efi.acpi)
			return __pa(efi.acpi);
	}
	/*
	 * 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;
}

#ifdef	CONFIG_X86_LOCAL_APIC
/*
 * Parse LAPIC entries in MADT
 * returns 0 on success, < 0 on error
 */
static int __init
acpi_parse_madt_lapic_entries(void)
{
	int count;

	/* 
	 * Note that the LAPIC address is obtained from the MADT (32-bit value)
	 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
	 */

	count = acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR, acpi_parse_lapic_addr_ovr, 0);
	if (count < 0) {
		printk(KERN_ERR PREFIX "Error parsing LAPIC address override entry\n");
		return count;
	}

	mp_register_lapic_address(acpi_lapic_addr);

	count = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic,
				       MAX_APICS);
	if (!count) { 
		printk(KERN_ERR PREFIX "No LAPIC entries present\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return -ENODEV;
	}
	else if (count < 0) {
		printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return count;
	}

	count = acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0);
	if (count < 0) {
		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return count;
	}
	return 0;
}
#endif /* CONFIG_X86_LOCAL_APIC */

#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)
/*
 * Parse IOAPIC related entries in MADT
 * returns 0 on success, < 0 on error
 */
static int __init
acpi_parse_madt_ioapic_entries(void)
{
	int count;

	/*
	 * ACPI interpreter is required to complete interrupt setup,
	 * so if it is off, don't enumerate the io-apics with ACPI.
	 * If MPS is present, it will handle them,
	 * otherwise the system will stay in PIC mode
	 */
	if (acpi_disabled || acpi_noirq) {
		return -ENODEV;
        }

	/*
 	 * if "noapic" boot option, don't look for IO-APICs
	 */
	if (skip_ioapic_setup) {
		printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
			"due to 'noapic' option.\n");
		return -ENODEV;
	}

	count = acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic, MAX_IO_APICS);
	if (!count) {
		printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
		return -ENODEV;
	}
	else if (count < 0) {
		printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
		return count;
	}

	count = acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr, NR_IRQ_VECTORS);
	if (count < 0) {
		printk(KERN_ERR PREFIX "Error parsing interrupt source overrides entry\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return count;
	}

	/*
	 * If BIOS did not supply an INT_SRC_OVR for the SCI
	 * pretend we got one so we can set the SCI flags.
	 */
	if (!acpi_sci_override_gsi)
		acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);

	/* Fill in identity legacy mapings where no override */
	mp_config_acpi_legacy_irqs();

	count = acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src, NR_IRQ_VECTORS);
	if (count < 0) {
		printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return count;
	}

	return 0;
}
#else
static inline int acpi_parse_madt_ioapic_entries(void)
{
	return -1;
}
#endif /* !(CONFIG_X86_IO_APIC && CONFIG_ACPI_INTERPRETER) */


static void __init
acpi_process_madt(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
	int count, error;

	count = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
	if (count >= 1) {

		/*
		 * Parse MADT LAPIC entries
		 */
		error = acpi_parse_madt_lapic_entries();
		if (!error) {
			acpi_lapic = 1;

			/*
			 * Parse MADT IO-APIC entries
			 */
			error = acpi_parse_madt_ioapic_entries();
			if (!error) {
				acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
				acpi_irq_balance_set(NULL);
				acpi_ioapic = 1;

				smp_found_config = 1;
				clustered_apic_check();
			}
		}
		if (error == -EINVAL) {
			/*
			 * Dell Precision Workstation 410, 610 come here.
			 */
			printk(KERN_ERR PREFIX "Invalid BIOS MADT, disabling ACPI\n");
			disable_acpi();
		}
	}
#endif
	return;
}

/*
 * acpi_boot_table_init() and acpi_boot_init()
 *  called from setup_arch(), always.
 *	1. checksums all tables
 *	2. enumerates lapics
 *	3. enumerates io-apics
 *
 * acpi_table_init() is separate to allow reading SRAT without
 * other side effects.
 *
 * side effects of acpi_boot_init:
 *	acpi_lapic = 1 if LAPIC found
 *	acpi_ioapic = 1 if IOAPIC found
 *	if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
 *	if acpi_blacklisted() acpi_disabled = 1;
 *	acpi_irq_model=...
 *	...
 *
 * return value: (currently ignored)
 *	0: success
 *	!0: failure
 */

int __init
acpi_boot_table_init(void)
{
	int error;

	/*
	 * If acpi_disabled, bail out
	 * One exception: acpi=ht continues far enough to enumerate LAPICs
	 */
	if (acpi_disabled && !acpi_ht)
		 return 1;

	/* 
	 * Initialize the ACPI boot-time table parser.
	 */
	error = acpi_table_init();
	if (error) {
		disable_acpi();
		return error;
	}

#ifdef __i386__
	check_acpi_pci();
#endif

	acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);

	/*
	 * blacklist may disable ACPI entirely
	 */
	error = acpi_blacklisted();
	if (error) {
		extern int acpi_force;

		if (acpi_force) {
			printk(KERN_WARNING PREFIX "acpi=force override\n");
		} else {
			printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
			disable_acpi();
			return error;
		}
	}

	return 0;
}


int __init acpi_boot_init(void)
{
	/*
	 * If acpi_disabled, bail out
	 * One exception: acpi=ht continues far enough to enumerate LAPICs
	 */
	if (acpi_disabled && !acpi_ht)
		 return 1;

	acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);

	/*
	 * set sci_int and PM timer address
	 */
	acpi_table_parse(ACPI_FADT, acpi_parse_fadt);

	/*
	 * Process the Multiple APIC Description Table (MADT), if present
	 */
	acpi_process_madt();

	acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
	acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);

	return 0;
}