OpenCloudOS-Kernel/arch/ia64/kernel/acpi.c

/*
 *  acpi.c - Architecture-Specific Low-Level ACPI Support
 *
 *  Copyright (C) 1999 VA Linux Systems
 *  Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
 *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 *  Copyright (C) 2000 Intel Corp.
 *  Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
 *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
 *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
 *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
 *  Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/mmzone.h>
#include <linux/nodemask.h>
#include <asm/io.h>
#include <asm/iosapic.h>
#include <asm/machvec.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/numa.h>
#include <asm/sal.h>
#include <asm/cyclone.h>

#define BAD_MADT_ENTRY(entry, end) (                                        \
		(!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
		((acpi_table_entry_header *)entry)->length != sizeof(*entry))

#define PREFIX			"ACPI: "

void (*pm_idle) (void);
EXPORT_SYMBOL(pm_idle);
void (*pm_power_off) (void);
EXPORT_SYMBOL(pm_power_off);

unsigned char acpi_kbd_controller_present = 1;
unsigned char acpi_legacy_devices;

static unsigned int __initdata acpi_madt_rev;

unsigned int acpi_cpei_override;
unsigned int acpi_cpei_phys_cpuid;

#define MAX_SAPICS 256
u16 ia64_acpiid_to_sapicid[MAX_SAPICS] =
	{ [0 ... MAX_SAPICS - 1] = -1 };
EXPORT_SYMBOL(ia64_acpiid_to_sapicid);

const char *
acpi_get_sysname (void)
{
#ifdef CONFIG_IA64_GENERIC
	unsigned long rsdp_phys;
	struct acpi20_table_rsdp *rsdp;
	struct acpi_table_xsdt *xsdt;
	struct acpi_table_header *hdr;

	rsdp_phys = acpi_find_rsdp();
	if (!rsdp_phys) {
		printk(KERN_ERR "ACPI 2.0 RSDP not found, default to \"dig\"\n");
		return "dig";
	}

	rsdp = (struct acpi20_table_rsdp *) __va(rsdp_phys);
	if (strncmp(rsdp->signature, RSDP_SIG, sizeof(RSDP_SIG) - 1)) {
		printk(KERN_ERR "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
		return "dig";
	}

	xsdt = (struct acpi_table_xsdt *) __va(rsdp->xsdt_address);
	hdr = &xsdt->header;
	if (strncmp(hdr->signature, XSDT_SIG, sizeof(XSDT_SIG) - 1)) {
		printk(KERN_ERR "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
		return "dig";
	}

	if (!strcmp(hdr->oem_id, "HP")) {
		return "hpzx1";
	}
	else if (!strcmp(hdr->oem_id, "SGI")) {
		return "sn2";
	}

	return "dig";
#else
# if defined (CONFIG_IA64_HP_SIM)
	return "hpsim";
# elif defined (CONFIG_IA64_HP_ZX1)
	return "hpzx1";
# elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
	return "hpzx1_swiotlb";
# elif defined (CONFIG_IA64_SGI_SN2)
	return "sn2";
# elif defined (CONFIG_IA64_DIG)
	return "dig";
# else
#	error Unknown platform.  Fix acpi.c.
# endif
#endif
}

#ifdef CONFIG_ACPI_BOOT

#define ACPI_MAX_PLATFORM_INTERRUPTS	256

/* Array to record platform interrupt vectors for generic interrupt routing. */
int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
	[0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
};

enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;

/*
 * Interrupt routing API for device drivers.  Provides interrupt vector for
 * a generic platform event.  Currently only CPEI is implemented.
 */
int
acpi_request_vector (u32 int_type)
{
	int vector = -1;

	if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
		/* corrected platform error interrupt */
		vector = platform_intr_list[int_type];
	} else
		printk(KERN_ERR "acpi_request_vector(): invalid interrupt type\n");
	return vector;
}

char *
__acpi_map_table (unsigned long phys_addr, unsigned long size)
{
	return __va(phys_addr);
}

/* --------------------------------------------------------------------------
                            Boot-time Table Parsing
   -------------------------------------------------------------------------- */

static int			total_cpus __initdata;
static int			available_cpus __initdata;
struct acpi_table_madt *	acpi_madt __initdata;
static u8			has_8259;


static int __init
acpi_parse_lapic_addr_ovr (
	acpi_table_entry_header *header, const unsigned long end)
{
	struct acpi_table_lapic_addr_ovr *lapic;

	lapic = (struct acpi_table_lapic_addr_ovr *) header;

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

	if (lapic->address) {
		iounmap(ipi_base_addr);
		ipi_base_addr = ioremap(lapic->address, 0);
	}
	return 0;
}


static int __init
acpi_parse_lsapic (acpi_table_entry_header *header, const unsigned long end)
{
	struct acpi_table_lsapic *lsapic;

	lsapic = (struct acpi_table_lsapic *) header;

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

	if (lsapic->flags.enabled) {
#ifdef CONFIG_SMP
		smp_boot_data.cpu_phys_id[available_cpus] = (lsapic->id << 8) | lsapic->eid;
#endif
		ia64_acpiid_to_sapicid[lsapic->acpi_id] = (lsapic->id << 8) | lsapic->eid;
		++available_cpus;
	}

	total_cpus++;
	return 0;
}


static int __init
acpi_parse_lapic_nmi (acpi_table_entry_header *header, const unsigned long end)
{
	struct acpi_table_lapic_nmi *lacpi_nmi;

	lacpi_nmi = (struct acpi_table_lapic_nmi*) header;

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

	/* TBD: Support lapic_nmi entries */
	return 0;
}


static int __init
acpi_parse_iosapic (acpi_table_entry_header *header, const unsigned long end)
{
	struct acpi_table_iosapic *iosapic;

	iosapic = (struct acpi_table_iosapic *) header;

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

	iosapic_init(iosapic->address, iosapic->global_irq_base);

	return 0;
}


static int __init
acpi_parse_plat_int_src (
	acpi_table_entry_header *header, const unsigned long end)
{
	struct acpi_table_plat_int_src *plintsrc;
	int vector;

	plintsrc = (struct acpi_table_plat_int_src *) header;

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

	/*
	 * 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) ? IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
						(plintsrc->flags.trigger == 1) ? IOSAPIC_EDGE : IOSAPIC_LEVEL);

	platform_intr_list[plintsrc->type] = vector;
	if (acpi_madt_rev > 1) {
		acpi_cpei_override = plintsrc->plint_flags.cpei_override_flag;
	}

	/*
	 * Save the physical id, so we can check when its being removed
	 */
	acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;

	return 0;
}


unsigned int can_cpei_retarget(void)
{
	extern int cpe_vector;

	/*
	 * Only if CPEI is supported and the override flag
	 * is present, otherwise return that its re-targettable
	 * if we are in polling mode.
	 */
	if (cpe_vector > 0 && !acpi_cpei_override)
		return 0;
	else
		return 1;
}

unsigned int is_cpu_cpei_target(unsigned int cpu)
{
	unsigned int logical_id;

	logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);

	if (logical_id == cpu)
		return 1;
	else
		return 0;
}

void set_cpei_target_cpu(unsigned int cpu)
{
	acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
}

unsigned int get_cpei_target_cpu(void)
{
	return acpi_cpei_phys_cpuid;
}

static int __init
acpi_parse_int_src_ovr (
	acpi_table_entry_header *header, const unsigned long end)
{
	struct acpi_table_int_src_ovr *p;

	p = (struct acpi_table_int_src_ovr *) header;

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

	iosapic_override_isa_irq(p->bus_irq, p->global_irq,
				 (p->flags.polarity == 1) ? IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
				 (p->flags.trigger == 1) ? IOSAPIC_EDGE : IOSAPIC_LEVEL);
	return 0;
}


static int __init
acpi_parse_nmi_src (acpi_table_entry_header *header, const unsigned long end)
{
	struct acpi_table_nmi_src *nmi_src;

	nmi_src = (struct acpi_table_nmi_src*) header;

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

	/* TBD: Support nimsrc entries */
	return 0;
}

static void __init
acpi_madt_oem_check (char *oem_id, char *oem_table_id)
{
	if (!strncmp(oem_id, "IBM", 3) &&
	    (!strncmp(oem_table_id, "SERMOW", 6))) {

		/*
		 * Unfortunately ITC_DRIFT is not yet part of the
		 * official SAL spec, so the ITC_DRIFT bit is not
		 * set by the BIOS on this hardware.
		 */
		sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;

		cyclone_setup();
	}
}

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);

	acpi_madt_rev = acpi_madt->header.revision;

	/* remember the value for reference after free_initmem() */
#ifdef CONFIG_ITANIUM
	has_8259 = 1; /* Firmware on old Itanium systems is broken */
#else
	has_8259 = acpi_madt->flags.pcat_compat;
#endif
	iosapic_system_init(has_8259);

	/* Get base address of IPI Message Block */

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

	printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);

	acpi_madt_oem_check(acpi_madt->header.oem_id,
		acpi_madt->header.oem_table_id);

	return 0;
}


#ifdef CONFIG_ACPI_NUMA

#undef SLIT_DEBUG

#define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)

static int __initdata srat_num_cpus;			/* number of cpus */
static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
#define pxm_bit_set(bit)	(set_bit(bit,(void *)pxm_flag))
#define pxm_bit_test(bit)	(test_bit(bit,(void *)pxm_flag))
/* maps to convert between proximity domain and logical node ID */
int __devinitdata pxm_to_nid_map[MAX_PXM_DOMAINS];
int __initdata nid_to_pxm_map[MAX_NUMNODES];
static struct acpi_table_slit __initdata *slit_table;

/*
 * ACPI 2.0 SLIT (System Locality Information Table)
 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 */
void __init
acpi_numa_slit_init (struct acpi_table_slit *slit)
{
	u32 len;

	len = sizeof(struct acpi_table_header) + 8
		+ slit->localities * slit->localities;
	if (slit->header.length != len) {
		printk(KERN_ERR "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
		       len, slit->header.length);
		memset(numa_slit, 10, sizeof(numa_slit));
		return;
	}
	slit_table = slit;
}

void __init
acpi_numa_processor_affinity_init (struct acpi_table_processor_affinity *pa)
{
	/* record this node in proximity bitmap */
	pxm_bit_set(pa->proximity_domain);

	node_cpuid[srat_num_cpus].phys_id = (pa->apic_id << 8) | (pa->lsapic_eid);
	/* nid should be overridden as logical node id later */
	node_cpuid[srat_num_cpus].nid = pa->proximity_domain;
	srat_num_cpus++;
}

void __init
acpi_numa_memory_affinity_init (struct acpi_table_memory_affinity *ma)
{
	unsigned long paddr, size;
	u8 pxm;
	struct node_memblk_s *p, *q, *pend;

	pxm = ma->proximity_domain;

	/* fill node memory chunk structure */
	paddr = ma->base_addr_hi;
	paddr = (paddr << 32) | ma->base_addr_lo;
	size = ma->length_hi;
	size = (size << 32) | ma->length_lo;

	/* Ignore disabled entries */
	if (!ma->flags.enabled)
		return;

	/* record this node in proximity bitmap */
	pxm_bit_set(pxm);

	/* Insertion sort based on base address */
	pend = &node_memblk[num_node_memblks];
	for (p = &node_memblk[0]; p < pend; p++) {
		if (paddr < p->start_paddr)
			break;
	}
	if (p < pend) {
		for (q = pend - 1; q >= p; q--)
			*(q + 1) = *q;
	}
	p->start_paddr = paddr;
	p->size = size;
	p->nid = pxm;
	num_node_memblks++;
}

void __init
acpi_numa_arch_fixup (void)
{
	int i, j, node_from, node_to;

	/* If there's no SRAT, fix the phys_id and mark node 0 online */
	if (srat_num_cpus == 0) {
		node_set_online(0);
		node_cpuid[0].phys_id = hard_smp_processor_id();
		return;
	}

	/*
	 * MCD - This can probably be dropped now.  No need for pxm ID to node ID
	 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
	 */
	/* calculate total number of nodes in system from PXM bitmap */
	memset(pxm_to_nid_map, -1, sizeof(pxm_to_nid_map));
	memset(nid_to_pxm_map, -1, sizeof(nid_to_pxm_map));
	nodes_clear(node_online_map);
	for (i = 0; i < MAX_PXM_DOMAINS; i++) {
		if (pxm_bit_test(i)) {
			int nid = num_online_nodes();
			pxm_to_nid_map[i] = nid;
			nid_to_pxm_map[nid] = i;
			node_set_online(nid);
		}
	}

	/* set logical node id in memory chunk structure */
	for (i = 0; i < num_node_memblks; i++)
		node_memblk[i].nid = pxm_to_nid_map[node_memblk[i].nid];

	/* assign memory bank numbers for each chunk on each node */
	for_each_online_node(i) {
		int bank;

		bank = 0;
		for (j = 0; j < num_node_memblks; j++)
			if (node_memblk[j].nid == i)
				node_memblk[j].bank = bank++;
	}

	/* set logical node id in cpu structure */
	for (i = 0; i < srat_num_cpus; i++)
		node_cpuid[i].nid = pxm_to_nid_map[node_cpuid[i].nid];

	printk(KERN_INFO "Number of logical nodes in system = %d\n", num_online_nodes());
	printk(KERN_INFO "Number of memory chunks in system = %d\n", num_node_memblks);

	if (!slit_table) return;
	memset(numa_slit, -1, sizeof(numa_slit));
	for (i=0; i<slit_table->localities; i++) {
		if (!pxm_bit_test(i))
			continue;
		node_from = pxm_to_nid_map[i];
		for (j=0; j<slit_table->localities; j++) {
			if (!pxm_bit_test(j))
				continue;
			node_to = pxm_to_nid_map[j];
			node_distance(node_from, node_to) =
				slit_table->entry[i*slit_table->localities + j];
		}
	}

#ifdef SLIT_DEBUG
	printk("ACPI 2.0 SLIT locality table:\n");
	for_each_online_node(i) {
		for_each_online_node(j)
			printk("%03d ", node_distance(i,j));
		printk("\n");
	}
#endif
}
#endif /* CONFIG_ACPI_NUMA */

unsigned int
acpi_register_gsi (u32 gsi, int edge_level, int active_high_low)
{
	if (has_8259 && gsi < 16)
		return isa_irq_to_vector(gsi);

	return iosapic_register_intr(gsi,
			(active_high_low == ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
			(edge_level == ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE : IOSAPIC_LEVEL);
}
EXPORT_SYMBOL(acpi_register_gsi);

#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
void
acpi_unregister_gsi (u32 gsi)
{
	iosapic_unregister_intr(gsi);
}
EXPORT_SYMBOL(acpi_unregister_gsi);
#endif /* CONFIG_ACPI_DEALLOCATE_IRQ */

static int __init
acpi_parse_fadt (unsigned long phys_addr, unsigned long size)
{
	struct acpi_table_header *fadt_header;
	struct fadt_descriptor_rev2 *fadt;

	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 = (struct fadt_descriptor_rev2 *) fadt_header;

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

	if (fadt->iapc_boot_arch & BAF_LEGACY_DEVICES)
		acpi_legacy_devices = 1;

	acpi_register_gsi(fadt->sci_int, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
	return 0;
}


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 (void)
{

	/*
	 * 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) < 0)
		printk(KERN_ERR PREFIX "Error parsing LAPIC address override entry\n");

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

	/* System-Level Interrupt Routing */

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

	/*
	 * FADT says whether a legacy keyboard controller is present.
	 * The FADT also 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_FADT, acpi_parse_fadt) < 1)
		printk(KERN_ERR PREFIX "Can't find FADT\n");

#ifdef CONFIG_SMP
	if (available_cpus == 0) {
		printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
		printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
		smp_boot_data.cpu_phys_id[available_cpus] = hard_smp_processor_id();
		available_cpus = 1; /* We've got at least one of these, no? */
	}
	smp_boot_data.cpu_count = available_cpus;

	smp_build_cpu_map();
# ifdef CONFIG_ACPI_NUMA
	if (srat_num_cpus == 0) {
		int cpu, i = 1;
		for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
			if (smp_boot_data.cpu_phys_id[cpu] != hard_smp_processor_id())
				node_cpuid[i++].phys_id = smp_boot_data.cpu_phys_id[cpu];
	}
	build_cpu_to_node_map();
# endif
#endif
	/* Make boot-up look pretty */
	printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus, total_cpus);
	return 0;
}

int
acpi_gsi_to_irq (u32 gsi, unsigned int *irq)
{
	int vector;

	if (has_8259 && gsi < 16)
		*irq = isa_irq_to_vector(gsi);
	else {
		vector = gsi_to_vector(gsi);
		if (vector == -1)
			return -1;

		*irq = vector;
	}
	return 0;
}

/*
 *  ACPI based hotplug CPU support
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
static
int
acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
{
#ifdef CONFIG_ACPI_NUMA
	int 			pxm_id;

	pxm_id = acpi_get_pxm(handle);

	/*
	 * Assuming that the container driver would have set the proximity
	 * domain and would have initialized pxm_to_nid_map[pxm_id] && pxm_flag
	 */
	node_cpuid[cpu].nid = (pxm_id < 0) ? 0:
			pxm_to_nid_map[pxm_id];

	node_cpuid[cpu].phys_id =  physid;
#endif
	return(0);
}


int
acpi_map_lsapic(acpi_handle handle, int *pcpu)
{
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *obj;
	struct acpi_table_lsapic *lsapic;
	cpumask_t tmp_map;
	long physid;
	int cpu;
 
	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
		return -EINVAL;

	if (!buffer.length ||  !buffer.pointer)
		return -EINVAL;
 
	obj = buffer.pointer;
	if (obj->type != ACPI_TYPE_BUFFER ||
	    obj->buffer.length < sizeof(*lsapic)) {
		acpi_os_free(buffer.pointer);
		return -EINVAL;
	}

	lsapic = (struct acpi_table_lsapic *)obj->buffer.pointer;

	if ((lsapic->header.type != ACPI_MADT_LSAPIC) ||
	    (!lsapic->flags.enabled)) {
		acpi_os_free(buffer.pointer);
		return -EINVAL;
	}

	physid = ((lsapic->id <<8) | (lsapic->eid));

	acpi_os_free(buffer.pointer);
	buffer.length = ACPI_ALLOCATE_BUFFER;
	buffer.pointer = NULL;

	cpus_complement(tmp_map, cpu_present_map);
	cpu = first_cpu(tmp_map);
	if(cpu >= NR_CPUS)
		return -EINVAL;

	acpi_map_cpu2node(handle, cpu, physid);

 	cpu_set(cpu, cpu_present_map);
	ia64_cpu_to_sapicid[cpu] = physid;
	ia64_acpiid_to_sapicid[lsapic->acpi_id] = ia64_cpu_to_sapicid[cpu];

	*pcpu = cpu;
	return(0);
}
EXPORT_SYMBOL(acpi_map_lsapic);


int
acpi_unmap_lsapic(int cpu)
{
	int i;

	for (i=0; i<MAX_SAPICS; i++) {
 		if (ia64_acpiid_to_sapicid[i] == ia64_cpu_to_sapicid[cpu]) {
 			ia64_acpiid_to_sapicid[i] = -1;
 			break;
 		}
 	}
	ia64_cpu_to_sapicid[cpu] = -1;
	cpu_clear(cpu,cpu_present_map);

#ifdef CONFIG_ACPI_NUMA
	/* NUMA specific cleanup's */
#endif

	return(0);
}
EXPORT_SYMBOL(acpi_unmap_lsapic);
#endif /* CONFIG_ACPI_HOTPLUG_CPU */
 

#ifdef CONFIG_ACPI_NUMA
acpi_status __init
acpi_map_iosapic (acpi_handle handle, u32 depth, void *context, void **ret)
{
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *obj;
	struct acpi_table_iosapic *iosapic;
	unsigned int gsi_base;
	int pxm, node;

	/* Only care about objects w/ a method that returns the MADT */
	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
		return AE_OK;

	if (!buffer.length || !buffer.pointer)
		return AE_OK;

	obj = buffer.pointer;
	if (obj->type != ACPI_TYPE_BUFFER ||
	    obj->buffer.length < sizeof(*iosapic)) {
		acpi_os_free(buffer.pointer);
		return AE_OK;
	}

	iosapic = (struct acpi_table_iosapic *)obj->buffer.pointer;

	if (iosapic->header.type != ACPI_MADT_IOSAPIC) {
		acpi_os_free(buffer.pointer);
		return AE_OK;
	}

	gsi_base = iosapic->global_irq_base;

	acpi_os_free(buffer.pointer);

	/*
	 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
	 * us which node to associate this with.
	 */
	pxm = acpi_get_pxm(handle);
	if (pxm < 0)
		return AE_OK;

	node = pxm_to_nid_map[pxm];

	if (node >= MAX_NUMNODES || !node_online(node) ||
	    cpus_empty(node_to_cpumask(node)))
		return AE_OK;

	/* We know a gsi to node mapping! */
	map_iosapic_to_node(gsi_base, node);
	return AE_OK;
}
#endif /* CONFIG_NUMA */
#endif /* CONFIG_ACPI_BOOT */