[mirror_ubuntu-artful-kernel.git] / drivers / acpi / tables.c

/*
 *  acpi_tables.c - ACPI Boot-Time Table Parsing
 *
 *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@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
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 */

#define pr_fmt(fmt) "ACPI: " fmt

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/errno.h>
#include <linux/acpi.h>
#include <linux/bootmem.h>

#define ACPI_MAX_TABLES		128

static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };

static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;

static int acpi_apic_instance __initdata;

/*
 * Disable table checksum verification for the early stage due to the size
 * limitation of the current x86 early mapping implementation.
 */
static bool acpi_verify_table_checksum __initdata = false;

void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
{
	if (!header)
		return;

	switch (header->type) {

	case ACPI_MADT_TYPE_LOCAL_APIC:
		{
			struct acpi_madt_local_apic *p =
			    (struct acpi_madt_local_apic *)header;
			pr_info("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
				p->processor_id, p->id,
				(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
		}
		break;

	case ACPI_MADT_TYPE_LOCAL_X2APIC:
		{
			struct acpi_madt_local_x2apic *p =
			    (struct acpi_madt_local_x2apic *)header;
			pr_info("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
				p->local_apic_id, p->uid,
				(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
		}
		break;

	case ACPI_MADT_TYPE_IO_APIC:
		{
			struct acpi_madt_io_apic *p =
			    (struct acpi_madt_io_apic *)header;
			pr_info("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
				p->id, p->address, p->global_irq_base);
		}
		break;

	case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
		{
			struct acpi_madt_interrupt_override *p =
			    (struct acpi_madt_interrupt_override *)header;
			pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
				p->bus, p->source_irq, p->global_irq,
				mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
				mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
			if (p->inti_flags  &
			    ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
				pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
					p->inti_flags  &
					~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
		}
		break;

	case ACPI_MADT_TYPE_NMI_SOURCE:
		{
			struct acpi_madt_nmi_source *p =
			    (struct acpi_madt_nmi_source *)header;
			pr_info("NMI_SRC (%s %s global_irq %d)\n",
				mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
				mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
				p->global_irq);
		}
		break;

	case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
		{
			struct acpi_madt_local_apic_nmi *p =
			    (struct acpi_madt_local_apic_nmi *)header;
			pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
				p->processor_id,
				mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK	],
				mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
				p->lint);
		}
		break;

	case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
		{
			u16 polarity, trigger;
			struct acpi_madt_local_x2apic_nmi *p =
			    (struct acpi_madt_local_x2apic_nmi *)header;

			polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
			trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;

			pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
				p->uid,
				mps_inti_flags_polarity[polarity],
				mps_inti_flags_trigger[trigger],
				p->lint);
		}
		break;

	case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
		{
			struct acpi_madt_local_apic_override *p =
			    (struct acpi_madt_local_apic_override *)header;
			pr_info("LAPIC_ADDR_OVR (address[%p])\n",
				(void *)(unsigned long)p->address);
		}
		break;

	case ACPI_MADT_TYPE_IO_SAPIC:
		{
			struct acpi_madt_io_sapic *p =
			    (struct acpi_madt_io_sapic *)header;
			pr_info("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
				p->id, (void *)(unsigned long)p->address,
				p->global_irq_base);
		}
		break;

	case ACPI_MADT_TYPE_LOCAL_SAPIC:
		{
			struct acpi_madt_local_sapic *p =
			    (struct acpi_madt_local_sapic *)header;
			pr_info("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
				p->processor_id, p->id, p->eid,
				(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
		}
		break;

	case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
		{
			struct acpi_madt_interrupt_source *p =
			    (struct acpi_madt_interrupt_source *)header;
			pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
				mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
				mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
				p->type, p->id, p->eid, p->io_sapic_vector,
				p->global_irq);
		}
		break;

	default:
		pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
			header->type);
		break;
	}
}


int __init
acpi_table_parse_entries(char *id,
			     unsigned long table_size,
			     int entry_id,
			     acpi_tbl_entry_handler handler,
			     unsigned int max_entries)
{
	struct acpi_table_header *table_header = NULL;
	struct acpi_subtable_header *entry;
	unsigned int count = 0;
	unsigned long table_end;
	acpi_size tbl_size;

	if (acpi_disabled)
		return -ENODEV;

	if (!handler)
		return -EINVAL;

	if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
		acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size);
	else
		acpi_get_table_with_size(id, 0, &table_header, &tbl_size);

	if (!table_header) {
		pr_warn("%4.4s not present\n", id);
		return -ENODEV;
	}

	table_end = (unsigned long)table_header + table_header->length;

	/* Parse all entries looking for a match. */

	entry = (struct acpi_subtable_header *)
	    ((unsigned long)table_header + table_size);

	while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
	       table_end) {
		if (entry->type == entry_id
		    && (!max_entries || count++ < max_entries))
			if (handler(entry, table_end))
				goto err;

		/*
		 * If entry->length is 0, break from this loop to avoid
		 * infinite loop.
		 */
		if (entry->length == 0) {
			pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
			goto err;
		}

		entry = (struct acpi_subtable_header *)
		    ((unsigned long)entry + entry->length);
	}
	if (max_entries && count > max_entries) {
		pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n",
			id, entry_id, count - max_entries, count);
	}

	early_acpi_os_unmap_memory((char *)table_header, tbl_size);
	return count;
err:
	early_acpi_os_unmap_memory((char *)table_header, tbl_size);
	return -EINVAL;
}

int __init
acpi_table_parse_madt(enum acpi_madt_type id,
		      acpi_tbl_entry_handler handler, unsigned int max_entries)
{
	return acpi_table_parse_entries(ACPI_SIG_MADT,
					    sizeof(struct acpi_table_madt), id,
					    handler, max_entries);
}

/**
 * acpi_table_parse - find table with @id, run @handler on it
 * @id: table id to find
 * @handler: handler to run
 *
 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
 * run @handler on it.
 *
 * Return 0 if table found, -errno if not.
 */
int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
{
	struct acpi_table_header *table = NULL;
	acpi_size tbl_size;

	if (acpi_disabled)
		return -ENODEV;

	if (!id || !handler)
		return -EINVAL;

	if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
		acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
	else
		acpi_get_table_with_size(id, 0, &table, &tbl_size);

	if (table) {
		handler(table);
		early_acpi_os_unmap_memory(table, tbl_size);
		return 0;
	} else
		return -ENODEV;
}

/* 
 * The BIOS is supposed to supply a single APIC/MADT,
 * but some report two.  Provide a knob to use either.
 * (don't you wish instance 0 and 1 were not the same?)
 */
static void __init check_multiple_madt(void)
{
	struct acpi_table_header *table = NULL;
	acpi_size tbl_size;

	acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
	if (table) {
		pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
			acpi_apic_instance);
		pr_warn("If \"acpi_apic_instance=%d\" works better, "
			"notify linux-acpi@vger.kernel.org\n",
			acpi_apic_instance ? 0 : 2);
		early_acpi_os_unmap_memory(table, tbl_size);

	} else
		acpi_apic_instance = 0;

	return;
}

/*
 * acpi_table_init()
 *
 * find RSDP, find and checksum SDT/XSDT.
 * checksum all tables, print SDT/XSDT
 *
 * result: sdt_entry[] is initialized
 */

int __init acpi_table_init(void)
{
	acpi_status status;

	if (acpi_verify_table_checksum) {
		pr_info("Early table checksum verification enabled\n");
		acpi_gbl_verify_table_checksum = TRUE;
	} else {
		pr_info("Early table checksum verification disabled\n");
		acpi_gbl_verify_table_checksum = FALSE;
	}

	status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
	if (ACPI_FAILURE(status))
		return -EINVAL;

	check_multiple_madt();
	return 0;
}

static int __init acpi_parse_apic_instance(char *str)
{
	if (!str)
		return -EINVAL;

	if (kstrtoint(str, 0, &acpi_apic_instance))
		return -EINVAL;

	pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);

	return 0;
}

early_param("acpi_apic_instance", acpi_parse_apic_instance);

static int __init acpi_force_table_verification_setup(char *s)
{
	acpi_verify_table_checksum = true;

	return 0;
}

early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* acpi_tables.c - ACPI Boot-Time Table Parsing
	3	*
	4	* Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	5	*
	6	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	23	*
	24	*/
	25
730bf5eb HG	26	#define pr_fmt(fmt) "ACPI: " fmt
730bf5eb HG	27
1da177e4 LT	28	#include <linux/init.h>
1da177e4 LT	29	#include <linux/kernel.h>
1da177e4 LT	30	#include <linux/smp.h>
	31	#include <linux/string.h>
	32	#include <linux/types.h>
	33	#include <linux/irq.h>
	34	#include <linux/errno.h>
	35	#include <linux/acpi.h>
	36	#include <linux/bootmem.h>
	37
04348e69	38	#define ACPI_MAX_TABLES 128
1da177e4	39
1da177e4 LT	40	static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
	41	static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
	42
ad71860a	43	static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
1da177e4	44
4e381a4f	45	static int acpi_apic_instance __initdata;
a1fdcc0d	46
4fc0a7e8 LZ	47	/*
	48	* Disable table checksum verification for the early stage due to the size
	49	* limitation of the current x86 early mapping implementation.
	50	*/
	51	static bool acpi_verify_table_checksum __initdata = false;
	52
a1fdcc0d	53	void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
1da177e4 LT	54	{
	55	if (!header)
	56	return;
	57
	58	switch (header->type) {
	59
5f3b1a8b	60	case ACPI_MADT_TYPE_LOCAL_APIC:
4be44fcd	61	{
5f3b1a8b AS	62	struct acpi_madt_local_apic *p =
5f3b1a8b AS	63	(struct acpi_madt_local_apic *)header;
730bf5eb HG	64	pr_info("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
	65	p->processor_id, p->id,
	66	(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
4be44fcd	67	}
1da177e4 LT	68	break;
1da177e4 LT	69
7237d3de SS	70	case ACPI_MADT_TYPE_LOCAL_X2APIC:
	71	{
	72	struct acpi_madt_local_x2apic *p =
	73	(struct acpi_madt_local_x2apic *)header;
730bf5eb HG	74	pr_info("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
	75	p->local_apic_id, p->uid,
	76	(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
7237d3de SS	77	}
	78	break;
	79
5f3b1a8b	80	case ACPI_MADT_TYPE_IO_APIC:
4be44fcd	81	{
5f3b1a8b AS	82	struct acpi_madt_io_apic *p =
5f3b1a8b AS	83	(struct acpi_madt_io_apic *)header;
730bf5eb HG	84	pr_info("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
730bf5eb HG	85	p->id, p->address, p->global_irq_base);
4be44fcd	86	}
1da177e4 LT	87	break;
1da177e4 LT	88
5f3b1a8b	89	case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
4be44fcd	90	{
5f3b1a8b AS	91	struct acpi_madt_interrupt_override *p =
5f3b1a8b AS	92	(struct acpi_madt_interrupt_override *)header;
730bf5eb HG	93	pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
	94	p->bus, p->source_irq, p->global_irq,
	95	mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
	96	mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
5f3b1a8b AS	97	if (p->inti_flags &
5f3b1a8b AS	98	~(ACPI_MADT_POLARITY_MASK \| ACPI_MADT_TRIGGER_MASK))
730bf5eb HG	99	pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
730bf5eb HG	100	p->inti_flags &
5f3b1a8b	101	~(ACPI_MADT_POLARITY_MASK \| ACPI_MADT_TRIGGER_MASK));
4be44fcd	102	}
1da177e4 LT	103	break;
1da177e4 LT	104
5f3b1a8b	105	case ACPI_MADT_TYPE_NMI_SOURCE:
4be44fcd	106	{
5f3b1a8b AS	107	struct acpi_madt_nmi_source *p =
5f3b1a8b AS	108	(struct acpi_madt_nmi_source *)header;
730bf5eb HG	109	pr_info("NMI_SRC (%s %s global_irq %d)\n",
	110	mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
	111	mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
	112	p->global_irq);
4be44fcd	113	}
1da177e4 LT	114	break;
1da177e4 LT	115
5f3b1a8b	116	case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
4be44fcd	117	{
5f3b1a8b AS	118	struct acpi_madt_local_apic_nmi *p =
5f3b1a8b AS	119	(struct acpi_madt_local_apic_nmi *)header;
730bf5eb HG	120	pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
	121	p->processor_id,
	122	mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
	123	mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
	124	p->lint);
7237d3de SS	125	}
	126	break;
	127
	128	case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
	129	{
	130	u16 polarity, trigger;
	131	struct acpi_madt_local_x2apic_nmi *p =
	132	(struct acpi_madt_local_x2apic_nmi *)header;
	133
	134	polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
	135	trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
	136
730bf5eb HG	137	pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
	138	p->uid,
	139	mps_inti_flags_polarity[polarity],
	140	mps_inti_flags_trigger[trigger],
	141	p->lint);
4be44fcd	142	}
1da177e4 LT	143	break;
1da177e4 LT	144
5f3b1a8b	145	case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
4be44fcd	146	{
5f3b1a8b AS	147	struct acpi_madt_local_apic_override *p =
5f3b1a8b AS	148	(struct acpi_madt_local_apic_override *)header;
730bf5eb HG	149	pr_info("LAPIC_ADDR_OVR (address[%p])\n",
730bf5eb HG	150	(void *)(unsigned long)p->address);
4be44fcd	151	}
1da177e4 LT	152	break;
1da177e4 LT	153
5f3b1a8b	154	case ACPI_MADT_TYPE_IO_SAPIC:
4be44fcd	155	{
5f3b1a8b AS	156	struct acpi_madt_io_sapic *p =
5f3b1a8b AS	157	(struct acpi_madt_io_sapic *)header;
730bf5eb HG	158	pr_info("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
	159	p->id, (void *)(unsigned long)p->address,
	160	p->global_irq_base);
4be44fcd	161	}
1da177e4 LT	162	break;
1da177e4 LT	163
5f3b1a8b	164	case ACPI_MADT_TYPE_LOCAL_SAPIC:
4be44fcd	165	{
5f3b1a8b AS	166	struct acpi_madt_local_sapic *p =
5f3b1a8b AS	167	(struct acpi_madt_local_sapic *)header;
730bf5eb HG	168	pr_info("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
	169	p->processor_id, p->id, p->eid,
	170	(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
4be44fcd	171	}
1da177e4 LT	172	break;
1da177e4 LT	173
5f3b1a8b	174	case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
4be44fcd	175	{
5f3b1a8b AS	176	struct acpi_madt_interrupt_source *p =
5f3b1a8b AS	177	(struct acpi_madt_interrupt_source *)header;
730bf5eb HG	178	pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
	179	mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
	180	mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
	181	p->type, p->id, p->eid, p->io_sapic_vector,
	182	p->global_irq);
4be44fcd	183	}
1da177e4 LT	184	break;
	185
	186	default:
730bf5eb HG	187	pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
730bf5eb HG	188	header->type);
1da177e4 LT	189	break;
	190	}
	191	}
	192
1da177e4 LT	193
1da177e4 LT	194	int __init
6eb87fed LB	195	acpi_table_parse_entries(char *id,
6eb87fed LB	196	unsigned long table_size,
4be44fcd	197	int entry_id,
b43e1065	198	acpi_tbl_entry_handler handler,
4be44fcd	199	unsigned int max_entries)
1da177e4	200	{
6eb87fed	201	struct acpi_table_header *table_header = NULL;
5f3b1a8b	202	struct acpi_subtable_header *entry;
4be44fcd	203	unsigned int count = 0;
6eb87fed	204	unsigned long table_end;
7d97277b	205	acpi_size tbl_size;
1da177e4	206
68ca4069	207	if (acpi_disabled)
e5b8fc6a LB	208	return -ENODEV;
e5b8fc6a LB	209
1da177e4 LT	210	if (!handler)
	211	return -EINVAL;
	212
a1fdcc0d	213	if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
7d97277b	214	acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size);
a1fdcc0d	215	else
7d97277b	216	acpi_get_table_with_size(id, 0, &table_header, &tbl_size);
1da177e4	217
6eb87fed	218	if (!table_header) {
730bf5eb	219	pr_warn("%4.4s not present\n", id);
1da177e4 LT	220	return -ENODEV;
	221	}
	222
6eb87fed	223	table_end = (unsigned long)table_header + table_header->length;
1da177e4 LT	224
	225	/* Parse all entries looking for a match. */
	226
5f3b1a8b	227	entry = (struct acpi_subtable_header *)
6eb87fed	228	((unsigned long)table_header + table_size);
1da177e4	229
5f3b1a8b	230	while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
6eb87fed	231	table_end) {
4be44fcd LB	232	if (entry->type == entry_id
4be44fcd LB	233	&& (!max_entries \|\| count++ < max_entries))
369d913b FY	234	if (handler(entry, table_end))
	235	goto err;
	236
	237	/*
	238	* If entry->length is 0, break from this loop to avoid
	239	* infinite loop.
	240	*/
	241	if (entry->length == 0) {
730bf5eb	242	pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
369d913b FY	243	goto err;
369d913b FY	244	}
1da177e4	245
5f3b1a8b	246	entry = (struct acpi_subtable_header *)
4be44fcd	247	((unsigned long)entry + entry->length);
1da177e4 LT	248	}
1da177e4 LT	249	if (max_entries && count > max_entries) {
730bf5eb HG	250	pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n",
730bf5eb HG	251	id, entry_id, count - max_entries, count);
1da177e4 LT	252	}
1da177e4 LT	253
7d97277b	254	early_acpi_os_unmap_memory((char *)table_header, tbl_size);
1da177e4	255	return count;
369d913b FY	256	err:
	257	early_acpi_os_unmap_memory((char *)table_header, tbl_size);
	258	return -EINVAL;
1da177e4 LT	259	}
1da177e4 LT	260
1da177e4	261	int __init
5f3b1a8b	262	acpi_table_parse_madt(enum acpi_madt_type id,
b43e1065	263	acpi_tbl_entry_handler handler, unsigned int max_entries)
1da177e4	264	{
6eb87fed	265	return acpi_table_parse_entries(ACPI_SIG_MADT,
4be44fcd LB	266	sizeof(struct acpi_table_madt), id,
4be44fcd LB	267	handler, max_entries);
1da177e4 LT	268	}
1da177e4 LT	269
7f8f97c3 LB	270	/**
7f8f97c3 LB	271	* acpi_table_parse - find table with @id, run @handler on it
7f8f97c3 LB	272	* @id: table id to find
	273	* @handler: handler to run
	274	*
	275	* Scan the ACPI System Descriptor Table (STD) for a table matching @id,
f8a571b2	276	* run @handler on it.
	277	*
	278	* Return 0 if table found, -errno if not.
7f8f97c3	279	*/
b43e1065	280	int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
1da177e4	281	{
ceb6c468	282	struct acpi_table_header *table = NULL;
7d97277b	283	acpi_size tbl_size;
a1fdcc0d	284
68ca4069	285	if (acpi_disabled)
e5b8fc6a LB	286	return -ENODEV;
e5b8fc6a LB	287
de2d1a7e	288	if (!id \|\| !handler)
1da177e4 LT	289	return -EINVAL;
1da177e4 LT	290
a1fdcc0d	291	if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
7d97277b	292	acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
a1fdcc0d	293	else
7d97277b	294	acpi_get_table_with_size(id, 0, &table, &tbl_size);
a1fdcc0d	295
ceb6c468 AS	296	if (table) {
ceb6c468 AS	297	handler(table);
7d97277b	298	early_acpi_os_unmap_memory(table, tbl_size);
ceb6c468	299	return 0;
7f8f97c3	300	} else
95df812d	301	return -ENODEV;
1da177e4 LT	302	}
1da177e4 LT	303
a1fdcc0d LB	304	/*
	305	* The BIOS is supposed to supply a single APIC/MADT,
	306	* but some report two. Provide a knob to use either.
	307	* (don't you wish instance 0 and 1 were not the same?)
	308	*/
	309	static void __init check_multiple_madt(void)
	310	{
	311	struct acpi_table_header *table = NULL;
7d97277b	312	acpi_size tbl_size;
a1fdcc0d	313
7d97277b	314	acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
a1fdcc0d	315	if (table) {
730bf5eb HG	316	pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
	317	acpi_apic_instance);
	318	pr_warn("If \"acpi_apic_instance=%d\" works better, "
	319	"notify linux-acpi@vger.kernel.org\n",
	320	acpi_apic_instance ? 0 : 2);
7d97277b	321	early_acpi_os_unmap_memory(table, tbl_size);
a1fdcc0d LB	322
	323	} else
	324	acpi_apic_instance = 0;
	325
	326	return;
	327	}
	328
1da177e4 LT	329	/*
	330	* acpi_table_init()
	331	*
	332	* find RSDP, find and checksum SDT/XSDT.
	333	* checksum all tables, print SDT/XSDT
5f3b1a8b	334	*
1da177e4 LT	335	* result: sdt_entry[] is initialized
	336	*/
	337
4be44fcd	338	int __init acpi_table_init(void)
1da177e4	339	{
9e3a9d1e LB	340	acpi_status status;
9e3a9d1e LB	341
4fc0a7e8 LZ	342	if (acpi_verify_table_checksum) {
	343	pr_info("Early table checksum verification enabled\n");
	344	acpi_gbl_verify_table_checksum = TRUE;
	345	} else {
	346	pr_info("Early table checksum verification disabled\n");
	347	acpi_gbl_verify_table_checksum = FALSE;
	348	}
	349
9e3a9d1e LB	350	status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
9e3a9d1e LB	351	if (ACPI_FAILURE(status))
95df812d	352	return -EINVAL;
9e3a9d1e	353
a1fdcc0d LB	354	check_multiple_madt();
	355	return 0;
	356	}
	357
	358	static int __init acpi_parse_apic_instance(char *str)
	359	{
f0df2d6b CG	360	if (!str)
f0df2d6b CG	361	return -EINVAL;
a1fdcc0d	362
3d915894 CJ	363	if (kstrtoint(str, 0, &acpi_apic_instance))
3d915894 CJ	364	return -EINVAL;
a1fdcc0d	365
730bf5eb	366	pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
a1fdcc0d	367
1da177e4 LT	368	return 0;
1da177e4 LT	369	}
a1fdcc0d LB	370
a1fdcc0d LB	371	early_param("acpi_apic_instance", acpi_parse_apic_instance);
4fc0a7e8 LZ	372
	373	static int __init acpi_force_table_verification_setup(char *s)
	374	{
	375	acpi_verify_table_checksum = true;
	376
	377	return 0;
	378	}
	379
	380	early_param("acpi_force_table_verification", acpi_force_table_verification_setup);