acpi.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

		return -ENODEV;

	p = (char *) (acpi_madt + 1);
	end = p + (acpi_madt->header.length - sizeof(struct acpi_table_madt));

	while (p < end) {
		if (*p == ACPI_MADT_IOSAPIC) {
			iosapic = (struct acpi_table_iosapic *) p;

			*gsi_base = iosapic->global_irq_base;
			*iosapic_address = ioremap(iosapic->address, 0);

			ver = iosapic_version(*iosapic_address);
			max_pin = (ver >> 16) & 0xff;

			if ((gsi - *gsi_base) <= max_pin)
				return 0;	/* Found it! */
		}
		p += p[1];
	}
	return -ENODEV;
}


static int __init
acpi_parse_iosapic (acpi_table_entry_header *header)
{
	struct acpi_table_iosapic *iosapic;

	iosapic = (struct acpi_table_iosapic *) header;
	if (!iosapic)
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	if (iosapic_init) {
#ifndef CONFIG_ITANIUM
		/* PCAT_COMPAT flag indicates dual-8259 setup */
		iosapic_init(iosapic->address, iosapic->global_irq_base,
			     acpi_madt->flags.pcat_compat);
#else
		/* Firmware on old Itanium systems is broken */
		iosapic_init(iosapic->address, iosapic->global_irq_base, 1);
#endif
	}
	return 0;
}


static int __init
acpi_parse_plat_int_src (acpi_table_entry_header *header)
{
	struct acpi_table_plat_int_src *plintsrc;
	int vector;
	u32 gsi_base;
	char *iosapic_address;

	plintsrc = (struct acpi_table_plat_int_src *) header;
	if (!plintsrc)
		return -EINVAL;

	acpi_table_print_madt_entry(header);

	if (!iosapic_register_platform_intr) {
		printk(KERN_WARNING PREFIX "No ACPI platform interrupt support\n");
		return -ENODEV;
	}

	if (acpi_find_iosapic(plintsrc->global_irq, &gsi_base, &iosapic_address)) {
		printk(KERN_WARNING PREFIX "IOSAPIC not found\n");
		return -ENODEV;
	}

	/*
	 * Get vector assignment for this interrupt, set attributes,
	 * and program the IOSAPIC routing table.
	 */
	vector = iosapic_register_platform_intr(plintsrc->type,
						plintsrc->global_irq,
						plintsrc->iosapic_vector,
						plintsrc->eid,
						plintsrc->id,
						(plintsrc->flags.polarity == 1) ? 1 : 0,
						(plintsrc->flags.trigger == 1) ? 1 : 0,
						gsi_base,
						iosapic_address);

	platform_intr_list[plintsrc->type] = vector;
	return 0;
}


static int __init
acpi_parse_int_src_ovr (acpi_table_entry_header *header)
{
	struct acpi_table_int_src_ovr *p;

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

	acpi_table_print_madt_entry(header);

	/* Ignore if the platform doesn't support overrides */
	if (!iosapic_override_isa_irq)
		return 0;

	iosapic_override_isa_irq(p->bus_irq, p->global_irq,
				 (p->flags.polarity == 1) ? 1 : 0,
				 (p->flags.trigger == 1) ? 1 : 0);

	return 0;
}


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

	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;
}


static int __init
acpi_parse_madt (unsigned long phys_addr, unsigned long size)
{
	if (!phys_addr || !size)
		return -EINVAL;

	acpi_madt = (struct acpi_table_madt *) __va(phys_addr);

	/* remember the value for reference after free_initmem() */
	has_8259 = acpi_madt->flags.pcat_compat;

	/* Get base address of IPI Message Block */

	if (acpi_madt->lapic_address)
		ipi_base_addr = (unsigned long) ioremap(acpi_madt->lapic_address, 0);

	printk(KERN_INFO PREFIX "Local APIC address 0x%lx\n", ipi_base_addr);
	return 0;
}


static int __init
acpi_parse_fadt (unsigned long phys_addr, unsigned long size)
{
	struct acpi_table_header *fadt_header;
	fadt_descriptor_rev2 *fadt;
	u32 sci_irq, gsi_base;
	char *iosapic_address;

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

	fadt_header = (struct acpi_table_header *) __va(phys_addr);

	if (fadt_header->revision != 3)
		return -ENODEV;		/* Only deal with ACPI 2.0 FADT */

	fadt = (fadt_descriptor_rev2 *) fadt_header;

	if (!(fadt->iapc_boot_arch & BAF_8042_KEYBOARD_CONTROLLER))
		acpi_kbd_controller_present = 0;

	sci_irq = fadt->sci_int;

	if (has_8259 && sci_irq < 16)
		return 0;	/* legacy, no setup required */

	if (!iosapic_register_intr)
		return -ENODEV;

	if (!acpi_find_iosapic(sci_irq, &gsi_base, &iosapic_address))
		iosapic_register_intr(sci_irq, 0, 0, gsi_base, iosapic_address);

	return 0;
}


#ifdef CONFIG_SERIAL_ACPI

#include <linux/acpi_serial.h>

static int __init
acpi_parse_spcr (unsigned long phys_addr, unsigned long size)
{
	acpi_ser_t *spcr;
	u32 gsi, gsi_base;
	char *iosapic_address;

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

	if (!iosapic_register_intr)
		return -ENODEV;

	/*
	 * ACPI is able to describe serial ports that live at non-standard
	 * memory addresses and use non-standard interrupts, either via
	 * direct SAPIC mappings or via PCI interrupts.  We handle interrupt
	 * routing for SAPIC-based (non-PCI) devices here.  Interrupt routing
	 * for PCI devices will be handled when processing the PCI Interrupt
	 * Routing Table (PRT).
	 */

	spcr = (acpi_ser_t *) __va(phys_addr);
	setup_serial_acpi(spcr);

	if (spcr->length < sizeof(acpi_ser_t))
		/* Table not long enough for full info, thus no interrupt */
		return -ENODEV;

	if ((spcr->base_addr.space_id != ACPI_SERIAL_PCICONF_SPACE) &&
	    (spcr->int_type == ACPI_SERIAL_INT_SAPIC)) {

		/* We have a UART in memory space with an SAPIC interrupt */

		gsi = (spcr->global_int[3] << 24) |
		      (spcr->global_int[2] << 16) |
		      (spcr->global_int[1] << 8)  |
		      (spcr->global_int[0]);

		if (!acpi_find_iosapic(gsi, &gsi_base, &iosapic_address))
			iosapic_register_intr(gsi, 1, 1,
					      gsi_base, iosapic_address);
	}
	return 0;
}

#endif /*CONFIG_SERIAL_ACPI*/


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

	if (efi.acpi20)
		rsdp_phys = __pa(efi.acpi20);
	else if (efi.acpi)
		printk(KERN_WARNING PREFIX "v1.0/r0.71 tables no longer supported\n");

	return rsdp_phys;
}


int __init
acpi_boot_init (char *cmdline)
{
	int result;

	/* Initialize the ACPI boot-time table parser */
	result = acpi_table_init(cmdline);
	if (result)
		return result;

	/*
	 * MADT
	 * ----
	 * Parse the Multiple APIC Description Table (MADT), if exists.
	 * Note that this table provides platform SMP configuration
	 * information -- the successor to MPS tables.
	 */

	if (acpi_table_parse(ACPI_APIC, acpi_parse_madt) < 1) {
		printk(KERN_ERR PREFIX "Can't find MADT\n");
		goto skip_madt;
	}

	/* Local APIC */

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

	if (acpi_table_parse_madt(ACPI_MADT_LSAPIC,
				  acpi_parse_lsapic) < 1)
		printk(KERN_ERR PREFIX "Error parsing MADT - no LAPIC entries\n");

	if (acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI,
				  acpi_parse_lapic_nmi) < 0)
		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");

	/* I/O APIC */

	if (acpi_table_parse_madt(ACPI_MADT_IOSAPIC,
				  acpi_parse_iosapic) < 1)
		printk(KERN_ERR PREFIX "Error parsing MADT - no IOAPIC entries\n");

	/* System-Level Interrupt Routing */

	if (acpi_table_parse_madt(ACPI_MADT_PLAT_INT_SRC,
				  acpi_parse_plat_int_src) < 0)
		printk(KERN_ERR PREFIX "Error parsing platform interrupt source entry\n");

	if (acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR,
				  acpi_parse_int_src_ovr) < 0)
		printk(KERN_ERR PREFIX "Error parsing interrupt source overrides entry\n");

	if (acpi_table_parse_madt(ACPI_MADT_NMI_SRC,
				  acpi_parse_nmi_src) < 0)
		printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
skip_madt:

	/*
	 * The FADT table contains an SCI_INT line, by which the system
	 * gets interrupts such as power and sleep buttons.  If it's not
	 * on a Legacy interrupt, it needs to be setup.
	 */
	if (acpi_table_parse(ACPI_FACP, acpi_parse_fadt) < 1)
		printk(KERN_ERR PREFIX "Can't find FADT\n");

#ifdef CONFIG_SERIAL_ACPI
	acpi_table_parse(ACPI_SPCR, acpi_parse_spcr);
#endif

#ifdef CONFIG_SMP
	if (available_cpus == 0) {
		printk("ACPI: Found 0 CPUS; assuming 1\n");
		available_cpus = 1; /* We've got at least one of these, no? */
	}
	smp_boot_data.cpu_count = total_cpus;
#endif
	/* Make boot-up look pretty */
	printk("%d CPUs available, %d CPUs total\n", available_cpus, total_cpus);
	return 0;
}


/* --------------------------------------------------------------------------
                             PCI Interrupt Routing
   -------------------------------------------------------------------------- */

int __init
acpi_get_prt (struct pci_vector_struct **vectors, int *count)
{
	struct pci_vector_struct *vector;
	struct list_head *node;
	struct acpi_prt_entry *entry;
	int i = 0;

	if (!vectors || !count)
		return -EINVAL;

	*vectors = NULL;
	*count = 0;

	if (acpi_prt.count < 0) {
		printk(KERN_ERR PREFIX "No PCI interrupt routing entries\n");
		return -ENODEV;
	}

	/* Allocate vectors */

	*vectors = kmalloc(sizeof(struct pci_vector_struct) * acpi_prt.count, GFP_KERNEL);
	if (!(*vectors))
		return -ENOMEM;

	/* Convert PRT entries to IOSAPIC PCI vectors */

	vector = *vectors;

	list_for_each(node, &acpi_prt.entries) {
		entry = (struct acpi_prt_entry *)node;
		vector[i].segment = entry->id.segment;
		vector[i].bus    = entry->id.bus;
		vector[i].pci_id = ((u32) entry->id.device << 16) | 0xffff;
		vector[i].pin    = entry->pin;
		vector[i].irq    = entry->link.index;
		i++;
	}
	*count = acpi_prt.count;
	return 0;
}

/* Assume IA64 always use I/O SAPIC */

int __init
acpi_get_interrupt_model (int *type)
{
        if (!type)
                return -EINVAL;

	*type = ACPI_IRQ_MODEL_IOSAPIC;
        return 0;
}

int
acpi_irq_to_vector (u32 irq)
{
	if (has_8259 && irq < 16)
		return isa_irq_to_vector(irq);

	return gsi_to_vector(irq);
}

#endif /* CONFIG_ACPI_BOOT */