boot.c 45.4 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
/*
 *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@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/init.h>
#include <linux/acpi.h>
28
#include <linux/acpi_pmtmr.h>
Linus Torvalds's avatar
Linus Torvalds committed
29
#include <linux/efi.h>
30
#include <linux/cpumask.h>
Linus Torvalds's avatar
Linus Torvalds committed
31
#include <linux/module.h>
32
#include <linux/dmi.h>
33
#include <linux/irq.h>
34 35
#include <linux/bootmem.h>
#include <linux/ioport.h>
Linus Torvalds's avatar
Linus Torvalds committed
36 37 38 39

#include <asm/pgtable.h>
#include <asm/io_apic.h>
#include <asm/apic.h>
40
#include <asm/genapic.h>
Linus Torvalds's avatar
Linus Torvalds committed
41 42
#include <asm/io.h>
#include <asm/mpspec.h>
43
#include <asm/smp.h>
Linus Torvalds's avatar
Linus Torvalds committed
44

45 46 47 48
#ifdef CONFIG_X86_LOCAL_APIC
# include <mach_apic.h>
#endif

49
static int __initdata acpi_force = 0;
50

51 52 53 54 55 56 57
#ifdef	CONFIG_ACPI
int acpi_disabled = 0;
#else
int acpi_disabled = 1;
#endif
EXPORT_SYMBOL(acpi_disabled);

Linus Torvalds's avatar
Linus Torvalds committed
58 59 60
#ifdef	CONFIG_X86_64

#include <asm/proto.h>
61

Len Brown's avatar
Len Brown committed
62
#else				/* X86 */
Linus Torvalds's avatar
Linus Torvalds committed
63 64 65 66

#ifdef	CONFIG_X86_LOCAL_APIC
#include <mach_apic.h>
#include <mach_mpparse.h>
Len Brown's avatar
Len Brown committed
67
#endif				/* CONFIG_X86_LOCAL_APIC */
Linus Torvalds's avatar
Linus Torvalds committed
68

Len Brown's avatar
Len Brown committed
69
#endif				/* X86 */
Linus Torvalds's avatar
Linus Torvalds committed
70 71 72

#define BAD_MADT_ENTRY(entry, end) (					    \
		(!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
73
		((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
Linus Torvalds's avatar
Linus Torvalds committed
74 75 76

#define PREFIX			"ACPI: "

Andrew Morton's avatar
Andrew Morton committed
77
int acpi_noirq;				/* skip ACPI IRQ initialization */
78 79
int acpi_pci_disabled;		/* skip ACPI PCI scan and IRQ initialization */
EXPORT_SYMBOL(acpi_pci_disabled);
Linus Torvalds's avatar
Linus Torvalds committed
80 81 82 83 84 85
int acpi_ht __initdata = 1;	/* enable HT */

int acpi_lapic;
int acpi_ioapic;
int acpi_strict;

86
u8 acpi_sci_flags __initdata;
Linus Torvalds's avatar
Linus Torvalds committed
87 88
int acpi_sci_override_gsi __initdata;
int acpi_skip_timer_override __initdata;
89
int acpi_use_timer_override __initdata;
Linus Torvalds's avatar
Linus Torvalds committed
90 91 92 93 94 95 96 97 98 99 100 101 102 103 104

#ifdef CONFIG_X86_LOCAL_APIC
static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
#endif

#ifndef __HAVE_ARCH_CMPXCHG
#warning ACPI uses CMPXCHG, i486 and later hardware
#endif

/* --------------------------------------------------------------------------
                              Boot-time Configuration
   -------------------------------------------------------------------------- */

/*
 * The default interrupt routing model is PIC (8259).  This gets
Simon Arlott's avatar
Simon Arlott committed
105
 * overridden if IOAPICs are enumerated (below).
Linus Torvalds's avatar
Linus Torvalds committed
106
 */
Len Brown's avatar
Len Brown committed
107
enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
Linus Torvalds's avatar
Linus Torvalds committed
108 109 110 111 112 113 114 115 116 117 118 119 120 121


/*
 * 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.
 */
122
char *__init __acpi_map_table(unsigned long phys, unsigned long size)
Linus Torvalds's avatar
Linus Torvalds committed
123 124 125 126
{
	unsigned long base, offset, mapped_size;
	int idx;

Yinghai Lu's avatar
Yinghai Lu committed
127 128 129
	if (!phys || !size)
		return NULL;

130
	if (phys+size <= (max_low_pfn_mapped << PAGE_SHIFT))
Len Brown's avatar
Len Brown committed
131
		return __va(phys);
Linus Torvalds's avatar
Linus Torvalds committed
132 133 134

	offset = phys & (PAGE_SIZE - 1);
	mapped_size = PAGE_SIZE - offset;
Yinghai Lu's avatar
Yinghai Lu committed
135
	clear_fixmap(FIX_ACPI_END);
Linus Torvalds's avatar
Linus Torvalds committed
136 137 138 139 140 141 142 143 144 145 146
	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 NULL;	/* cannot handle this */
		phys += PAGE_SIZE;
Yinghai Lu's avatar
Yinghai Lu committed
147
		clear_fixmap(idx);
Linus Torvalds's avatar
Linus Torvalds committed
148 149 150 151
		set_fixmap(idx, phys);
		mapped_size += PAGE_SIZE;
	}

Len Brown's avatar
Len Brown committed
152
	return ((unsigned char *)base + offset);
Linus Torvalds's avatar
Linus Torvalds committed
153 154 155
}

#ifdef CONFIG_PCI_MMCONFIG
156 157 158

static int acpi_mcfg_64bit_base_addr __initdata = FALSE;

159
/* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
160
struct acpi_mcfg_allocation *pci_mmcfg_config;
161 162
int pci_mmcfg_config_num;

163 164 165 166 167 168 169 170
static int __init acpi_mcfg_oem_check(struct acpi_table_mcfg *mcfg)
{
	if (!strcmp(mcfg->header.oem_id, "SGI"))
		acpi_mcfg_64bit_base_addr = TRUE;

	return 0;
}

171
int __init acpi_parse_mcfg(struct acpi_table_header *header)
Linus Torvalds's avatar
Linus Torvalds committed
172 173
{
	struct acpi_table_mcfg *mcfg;
174 175
	unsigned long i;
	int config_size;
Linus Torvalds's avatar
Linus Torvalds committed
176

177
	if (!header)
Linus Torvalds's avatar
Linus Torvalds committed
178 179
		return -EINVAL;

180
	mcfg = (struct acpi_table_mcfg *)header;
Linus Torvalds's avatar
Linus Torvalds committed
181

182 183
	/* how many config structures do we have */
	pci_mmcfg_config_num = 0;
184
	i = header->length - sizeof(struct acpi_table_mcfg);
185
	while (i >= sizeof(struct acpi_mcfg_allocation)) {
186
		++pci_mmcfg_config_num;
187
		i -= sizeof(struct acpi_mcfg_allocation);
188 189 190
	};
	if (pci_mmcfg_config_num == 0) {
		printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
Linus Torvalds's avatar
Linus Torvalds committed
191 192 193
		return -ENODEV;
	}

194 195 196 197 198 199 200 201
	config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
	pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
	if (!pci_mmcfg_config) {
		printk(KERN_WARNING PREFIX
		       "No memory for MCFG config tables\n");
		return -ENOMEM;
	}

202
	memcpy(pci_mmcfg_config, &mcfg[1], config_size);
203 204 205

	acpi_mcfg_oem_check(mcfg);

206
	for (i = 0; i < pci_mmcfg_config_num; ++i) {
207 208
		if ((pci_mmcfg_config[i].address > 0xFFFFFFFF) &&
		    !acpi_mcfg_64bit_base_addr) {
209 210
			printk(KERN_ERR PREFIX
			       "MMCONFIG not in low 4GB of memory\n");
211 212
			kfree(pci_mmcfg_config);
			pci_mmcfg_config_num = 0;
213 214 215
			return -ENODEV;
		}
	}
Linus Torvalds's avatar
Linus Torvalds committed
216 217 218

	return 0;
}
Len Brown's avatar
Len Brown committed
219
#endif				/* CONFIG_PCI_MMCONFIG */
Linus Torvalds's avatar
Linus Torvalds committed
220 221

#ifdef CONFIG_X86_LOCAL_APIC
222
static int __init acpi_parse_madt(struct acpi_table_header *table)
Linus Torvalds's avatar
Linus Torvalds committed
223
{
Len Brown's avatar
Len Brown committed
224
	struct acpi_table_madt *madt = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
225

226
	if (!cpu_has_apic)
Linus Torvalds's avatar
Linus Torvalds committed
227 228
		return -EINVAL;

229
	madt = (struct acpi_table_madt *)table;
Linus Torvalds's avatar
Linus Torvalds committed
230 231 232 233 234
	if (!madt) {
		printk(KERN_WARNING PREFIX "Unable to map MADT\n");
		return -ENODEV;
	}

235 236
	if (madt->address) {
		acpi_lapic_addr = (u64) madt->address;
Linus Torvalds's avatar
Linus Torvalds committed
237 238

		printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
239
		       madt->address);
Linus Torvalds's avatar
Linus Torvalds committed
240 241 242
	}

	acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
Len Brown's avatar
Len Brown committed
243

Linus Torvalds's avatar
Linus Torvalds committed
244 245 246
	return 0;
}

247 248
static void __cpuinit acpi_register_lapic(int id, u8 enabled)
{
Yinghai Lu's avatar
Yinghai Lu committed
249 250
	unsigned int ver = 0;

251 252 253 254 255
	if (!enabled) {
		++disabled_cpus;
		return;
	}

Yinghai Lu's avatar
Yinghai Lu committed
256 257 258 259
	if (boot_cpu_physical_apicid != -1U)
		ver = apic_version[boot_cpu_physical_apicid];

	generic_processor_info(id, ver);
260 261
}

Linus Torvalds's avatar
Linus Torvalds committed
262
static int __init
263
acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
264
{
265
	struct acpi_madt_local_apic *processor = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
266

267
	processor = (struct acpi_madt_local_apic *)header;
Linus Torvalds's avatar
Linus Torvalds committed
268 269 270 271 272 273

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

	acpi_table_print_madt_entry(header);

274 275 276 277 278 279 280
	/*
	 * We need to register disabled CPU as well to permit
	 * counting disabled CPUs. This allows us to size
	 * cpus_possible_map more accurately, to permit
	 * to not preallocating memory for all NR_CPUS
	 * when we use CPU hotplug.
	 */
281 282
	acpi_register_lapic(processor->id,	/* APIC ID */
			    processor->lapic_flags & ACPI_MADT_ENABLED);
Linus Torvalds's avatar
Linus Torvalds committed
283 284 285 286

	return 0;
}

287 288 289 290 291 292 293 294 295 296 297 298
static int __init
acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
{
	struct acpi_madt_local_sapic *processor = NULL;

	processor = (struct acpi_madt_local_sapic *)header;

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

	acpi_table_print_madt_entry(header);

299 300
	acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
			    processor->lapic_flags & ACPI_MADT_ENABLED);
301 302 303 304

	return 0;
}

Linus Torvalds's avatar
Linus Torvalds committed
305
static int __init
306
acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
Len Brown's avatar
Len Brown committed
307
			  const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
308
{
309
	struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
310

311
	lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
Linus Torvalds's avatar
Linus Torvalds committed
312 313 314 315 316 317 318 319 320 321

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

	acpi_lapic_addr = lapic_addr_ovr->address;

	return 0;
}

static int __init
322
acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
323
{
324
	struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
325

326
	lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
Linus Torvalds's avatar
Linus Torvalds committed
327 328 329 330 331 332 333 334 335 336 337 338

	if (BAD_MADT_ENTRY(lapic_nmi, end))
		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;
}

Len Brown's avatar
Len Brown committed
339
#endif				/*CONFIG_X86_LOCAL_APIC */
Linus Torvalds's avatar
Linus Torvalds committed
340

341
#ifdef CONFIG_X86_IO_APIC
Linus Torvalds's avatar
Linus Torvalds committed
342 343

static int __init
344
acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
345
{
346
	struct acpi_madt_io_apic *ioapic = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
347

348
	ioapic = (struct acpi_madt_io_apic *)header;
Linus Torvalds's avatar
Linus Torvalds committed
349 350 351

	if (BAD_MADT_ENTRY(ioapic, end))
		return -EINVAL;
Len Brown's avatar
Len Brown committed
352

Linus Torvalds's avatar
Linus Torvalds committed
353 354
	acpi_table_print_madt_entry(header);

Len Brown's avatar
Len Brown committed
355 356 357
	mp_register_ioapic(ioapic->id,
			   ioapic->address, ioapic->global_irq_base);

Linus Torvalds's avatar
Linus Torvalds committed
358 359 360 361 362 363
	return 0;
}

/*
 * Parse Interrupt Source Override for the ACPI SCI
 */
364
static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
Linus Torvalds's avatar
Linus Torvalds committed
365 366 367 368 369 370 371 372
{
	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= */
373 374
	if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
		trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
Linus Torvalds's avatar
Linus Torvalds committed
375

376 377
	if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
		polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
Linus Torvalds's avatar
Linus Torvalds committed
378 379

	/*
Len Brown's avatar
Len Brown committed
380
	 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
Linus Torvalds's avatar
Linus Torvalds committed
381 382 383
	 * If GSI is < 16, this will update its flags,
	 * else it will create a new mp_irqs[] entry.
	 */
384
	mp_override_legacy_irq(gsi, polarity, trigger, gsi);
Linus Torvalds's avatar
Linus Torvalds committed
385 386 387

	/*
	 * stash over-ride to indicate we've been here
388
	 * and for later update of acpi_gbl_FADT
Linus Torvalds's avatar
Linus Torvalds committed
389
	 */
390
	acpi_sci_override_gsi = gsi;
Linus Torvalds's avatar
Linus Torvalds committed
391 392 393 394
	return;
}

static int __init
395
acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
Len Brown's avatar
Len Brown committed
396
		       const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
397
{
398
	struct acpi_madt_interrupt_override *intsrc = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
399

400
	intsrc = (struct acpi_madt_interrupt_override *)header;
Linus Torvalds's avatar
Linus Torvalds committed
401 402 403 404 405 406

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

	acpi_table_print_madt_entry(header);

407
	if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
408
		acpi_sci_ioapic_setup(intsrc->global_irq,
409 410
				      intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
				      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
Linus Torvalds's avatar
Linus Torvalds committed
411 412 413 414
		return 0;
	}

	if (acpi_skip_timer_override &&
415
	    intsrc->source_irq == 0 && intsrc->global_irq == 2) {
Len Brown's avatar
Len Brown committed
416 417
		printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
418 419
	}

420 421 422 423
	mp_override_legacy_irq(intsrc->source_irq,
				intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
				(intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
				intsrc->global_irq);
Linus Torvalds's avatar
Linus Torvalds committed
424 425 426 427 428

	return 0;
}

static int __init
429
acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
430
{
431
	struct acpi_madt_nmi_source *nmi_src = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
432

433
	nmi_src = (struct acpi_madt_nmi_source *)header;
Linus Torvalds's avatar
Linus Torvalds committed
434 435 436 437 438 439 440 441 442 443 444

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

	acpi_table_print_madt_entry(header);

	/* TBD: Support nimsrc entries? */

	return 0;
}

Len Brown's avatar
Len Brown committed
445
#endif				/* CONFIG_X86_IO_APIC */
Linus Torvalds's avatar
Linus Torvalds committed
446 447 448

/*
 * acpi_pic_sci_set_trigger()
449
 *
Linus Torvalds's avatar
Linus Torvalds committed
450 451 452 453 454 455 456
 * use ELCR to set PIC-mode trigger type for SCI
 *
 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 * it may require Edge Trigger -- use "acpi_sci=edge"
 *
 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
Simon Arlott's avatar
Simon Arlott committed
457 458
 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
Linus Torvalds's avatar
Linus Torvalds committed
459 460
 */

Len Brown's avatar
Len Brown committed
461
void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
Linus Torvalds's avatar
Linus Torvalds committed
462 463 464 465 466 467 468 469
{
	unsigned int mask = 1 << irq;
	unsigned int old, new;

	/* Real old ELCR mask */
	old = inb(0x4d0) | (inb(0x4d1) << 8);

	/*
Simon Arlott's avatar
Simon Arlott committed
470
	 * If we use ACPI to set PCI IRQs, then we should clear ELCR
Linus Torvalds's avatar
Linus Torvalds committed
471 472 473 474 475 476 477 478 479 480
	 * since we will set it correctly as we enable the PCI irq
	 * routing.
	 */
	new = acpi_noirq ? old : 0;

	/*
	 * Update SCI information in the ELCR, it isn't in the PCI
	 * routing tables..
	 */
	switch (trigger) {
Len Brown's avatar
Len Brown committed
481
	case 1:		/* Edge - clear */
Linus Torvalds's avatar
Linus Torvalds committed
482 483
		new &= ~mask;
		break;
Len Brown's avatar
Len Brown committed
484
	case 3:		/* Level - set */
Linus Torvalds's avatar
Linus Torvalds committed
485 486 487 488 489 490 491 492 493 494 495 496 497 498
		new |= mask;
		break;
	}

	if (old == new)
		return;

	printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
	outb(new, 0x4d0);
	outb(new >> 8, 0x4d1);
}

int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
{
499
	*irq = gsi;
Linus Torvalds's avatar
Linus Torvalds committed
500 501 502
	return 0;
}

503 504 505 506
/*
 * success: return IRQ number (>=0)
 * failure: return < 0
 */
507
int acpi_register_gsi(u32 gsi, int triggering, int polarity)
Linus Torvalds's avatar
Linus Torvalds committed
508 509 510 511 512 513 514 515 516
{
	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) {
517
		if (triggering == ACPI_LEVEL_SENSITIVE)
Len Brown's avatar
Len Brown committed
518
			eisa_set_level_irq(gsi);
Linus Torvalds's avatar
Linus Torvalds committed
519 520 521 522 523
	}
#endif

#ifdef CONFIG_X86_IO_APIC
	if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
524
		plat_gsi = mp_register_gsi(gsi, triggering, polarity);
Linus Torvalds's avatar
Linus Torvalds committed
525 526 527 528 529
	}
#endif
	acpi_gsi_to_irq(plat_gsi, &irq);
	return irq;
}
Len Brown's avatar
Len Brown committed
530

Linus Torvalds's avatar
Linus Torvalds committed
531 532 533 534
/*
 *  ACPI based hotplug support for CPU
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
535 536

static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
Linus Torvalds's avatar
Linus Torvalds committed
537
{
538 539
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
540
	struct acpi_madt_local_apic *lapic;
541
	cpumask_var_t tmp_map, new_map;
542 543
	u8 physid;
	int cpu;
544
	int retval = -ENOMEM;
545 546 547 548 549 550 551 552 553 554 555 556 557 558

	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(*lapic)) {
		kfree(buffer.pointer);
		return -EINVAL;
	}

559
	lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
560

561 562
	if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
	    !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
563 564 565 566 567 568 569 570 571 572
		kfree(buffer.pointer);
		return -EINVAL;
	}

	physid = lapic->id;

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

573 574 575 576 577 578 579
	if (!alloc_cpumask_var(&tmp_map, GFP_KERNEL))
		goto out;

	if (!alloc_cpumask_var(&new_map, GFP_KERNEL))
		goto free_tmp_map;

	cpumask_copy(tmp_map, cpu_present_mask);
580
	acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
581 582 583 584 585

	/*
	 * If mp_register_lapic successfully generates a new logical cpu
	 * number, then the following will get us exactly what was mapped
	 */
586 587
	cpumask_andnot(new_map, cpu_present_mask, tmp_map);
	if (cpumask_empty(new_map)) {
588
		printk ("Unable to map lapic to logical cpu number\n");
589 590
		retval = -EINVAL;
		goto free_new_map;
591 592
	}

593
	cpu = cpumask_first(new_map);
594 595

	*pcpu = cpu;
596 597 598 599 600 601 602 603
	retval = 0;

free_new_map:
	free_cpumask_var(new_map);
free_tmp_map:
	free_cpumask_var(tmp_map);
out:
	return retval;
Linus Torvalds's avatar
Linus Torvalds committed
604 605
}

606 607 608 609 610
/* wrapper to silence section mismatch warning */
int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
{
	return _acpi_map_lsapic(handle, pcpu);
}
Len Brown's avatar
Len Brown committed
611
EXPORT_SYMBOL(acpi_map_lsapic);
Linus Torvalds's avatar
Linus Torvalds committed
612

Len Brown's avatar
Len Brown committed
613
int acpi_unmap_lsapic(int cpu)
Linus Torvalds's avatar
Linus Torvalds committed
614
{
615
	per_cpu(x86_cpu_to_apicid, cpu) = -1;
616
	set_cpu_present(cpu, false);
617 618 619
	num_processors--;

	return (0);
Linus Torvalds's avatar
Linus Torvalds committed
620
}
Len Brown's avatar
Len Brown committed
621

Linus Torvalds's avatar
Linus Torvalds committed
622
EXPORT_SYMBOL(acpi_unmap_lsapic);
Len Brown's avatar
Len Brown committed
623
#endif				/* CONFIG_ACPI_HOTPLUG_CPU */
Linus Torvalds's avatar
Linus Torvalds committed
624

Len Brown's avatar
Len Brown committed
625
int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
626 627 628 629
{
	/* TBD */
	return -EINVAL;
}
Len Brown's avatar
Len Brown committed
630

631 632
EXPORT_SYMBOL(acpi_register_ioapic);

Len Brown's avatar
Len Brown committed
633
int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
634 635 636 637
{
	/* TBD */
	return -EINVAL;
}
Len Brown's avatar
Len Brown committed
638

639 640
EXPORT_SYMBOL(acpi_unregister_ioapic);

641
static int __init acpi_parse_sbf(struct acpi_table_header *table)
Linus Torvalds's avatar
Linus Torvalds committed
642
{
643
	struct acpi_table_boot *sb;
Linus Torvalds's avatar
Linus Torvalds committed
644

645
	sb = (struct acpi_table_boot *)table;
Linus Torvalds's avatar
Linus Torvalds committed
646 647 648 649 650
	if (!sb) {
		printk(KERN_WARNING PREFIX "Unable to map SBF\n");
		return -ENODEV;
	}

651
	sbf_port = sb->cmos_index;	/* Save CMOS port */
Linus Torvalds's avatar
Linus Torvalds committed
652 653 654 655 656

	return 0;
}

#ifdef CONFIG_HPET_TIMER
657
#include <asm/hpet.h>
Linus Torvalds's avatar
Linus Torvalds committed
658

659 660
static struct __initdata resource *hpet_res;

661
static int __init acpi_parse_hpet(struct acpi_table_header *table)
Linus Torvalds's avatar
Linus Torvalds committed
662 663 664
{
	struct acpi_table_hpet *hpet_tbl;

665
	hpet_tbl = (struct acpi_table_hpet *)table;
Linus Torvalds's avatar
Linus Torvalds committed
666 667 668 669 670
	if (!hpet_tbl) {
		printk(KERN_WARNING PREFIX "Unable to map HPET\n");
		return -ENODEV;
	}

671
	if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
Linus Torvalds's avatar
Linus Torvalds committed
672 673 674 675
		printk(KERN_WARNING PREFIX "HPET timers must be located in "
		       "memory.\n");
		return -1;
	}
676

677
	hpet_address = hpet_tbl->address.address;
Thomas Gleixner's avatar
Thomas Gleixner committed
678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709

	/*
	 * Some broken BIOSes advertise HPET at 0x0. We really do not
	 * want to allocate a resource there.
	 */
	if (!hpet_address) {
		printk(KERN_WARNING PREFIX
		       "HPET id: %#x base: %#lx is invalid\n",
		       hpet_tbl->id, hpet_address);
		return 0;
	}
#ifdef CONFIG_X86_64
	/*
	 * Some even more broken BIOSes advertise HPET at
	 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
	 * some noise:
	 */
	if (hpet_address == 0xfed0000000000000UL) {
		if (!hpet_force_user) {
			printk(KERN_WARNING PREFIX "HPET id: %#x "
			       "base: 0xfed0000000000000 is bogus\n "
			       "try hpet=force on the kernel command line to "
			       "fix it up to 0xfed00000.\n", hpet_tbl->id);
			hpet_address = 0;
			return 0;
		}
		printk(KERN_WARNING PREFIX
		       "HPET id: %#x base: 0xfed0000000000000 fixed up "
		       "to 0xfed00000.\n", hpet_tbl->id);
		hpet_address >>= 32;
	}
#endif
Len Brown's avatar
Len Brown committed
710
	printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
711
	       hpet_tbl->id, hpet_address);
Linus Torvalds's avatar
Linus Torvalds committed
712

713 714 715 716 717 718 719 720 721 722 723 724 725 726 727
	/*
	 * Allocate and initialize the HPET firmware resource for adding into
	 * the resource tree during the lateinit timeframe.
	 */
#define HPET_RESOURCE_NAME_SIZE 9
	hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);

	hpet_res->name = (void *)&hpet_res[1];
	hpet_res->flags = IORESOURCE_MEM;
	snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
		 hpet_tbl->sequence);

	hpet_res->start = hpet_address;
	hpet_res->end = hpet_address + (1 * 1024) - 1;

Linus Torvalds's avatar
Linus Torvalds committed
728 729
	return 0;
}
730 731 732 733 734 735 736 737 738 739 740 741 742 743 744

/*
 * hpet_insert_resource inserts the HPET resources used into the resource
 * tree.
 */
static __init int hpet_insert_resource(void)
{
	if (!hpet_res)
		return 1;

	return insert_resource(&iomem_resource, hpet_res);
}

late_initcall(hpet_insert_resource);

Linus Torvalds's avatar
Linus Torvalds committed
745 746 747 748
#else
#define	acpi_parse_hpet	NULL
#endif

749
static int __init acpi_parse_fadt(struct acpi_table_header *table)
Linus Torvalds's avatar
Linus Torvalds committed
750
{
Jason Davis's avatar
Jason Davis committed
751

Linus Torvalds's avatar
Linus Torvalds committed
752 753
#ifdef CONFIG_X86_PM_TIMER
	/* detect the location of the ACPI PM Timer */
754
	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
Linus Torvalds's avatar
Linus Torvalds committed
755
		/* FADT rev. 2 */
756
		if (acpi_gbl_FADT.xpm_timer_block.space_id !=
Len Brown's avatar
Len Brown committed
757
		    ACPI_ADR_SPACE_SYSTEM_IO)
Linus Torvalds's avatar
Linus Torvalds committed
758 759
			return 0;

760
		pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
761 762 763 764 765 766
		/*
		 * "X" fields are optional extensions to the original V1.0
		 * fields, so we must selectively expand V1.0 fields if the
		 * corresponding X field is zero.
	 	 */
		if (!pmtmr_ioport)
767
			pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
Linus Torvalds's avatar
Linus Torvalds committed
768 769
	} else {
		/* FADT rev. 1 */
770
		pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
Linus Torvalds's avatar
Linus Torvalds committed
771 772
	}
	if (pmtmr_ioport)
Len Brown's avatar
Len Brown committed
773 774
		printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
		       pmtmr_ioport);
Linus Torvalds's avatar
Linus Torvalds committed
775 776 777 778 779 780 781 782 783
#endif
	return 0;
}

#ifdef	CONFIG_X86_LOCAL_APIC
/*
 * Parse LAPIC entries in MADT
 * returns 0 on success, < 0 on error
 */
784 785 786 787 788 789

static void __init acpi_register_lapic_address(unsigned long address)
{
	mp_lapic_addr = address;

	set_fixmap_nocache(FIX_APIC_BASE, address);
Yinghai Lu's avatar
Yinghai Lu committed
790
	if (boot_cpu_physical_apicid == -1U) {
791
		boot_cpu_physical_apicid  = read_apic_id();
Yinghai Lu's avatar
Yinghai Lu committed
792 793 794
		apic_version[boot_cpu_physical_apicid] =
			 GET_APIC_VERSION(apic_read(APIC_LVR));
	}
795 796
}

797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822
static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
{
	int count;

	if (!cpu_has_apic)
		return -ENODEV;

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

	acpi_register_lapic_address(acpi_lapic_addr);

	return count;
}

Len Brown's avatar
Len Brown committed
823
static int __init acpi_parse_madt_lapic_entries(void)
Linus Torvalds's avatar
Linus Torvalds committed
824 825 826
{
	int count;

827 828 829
	if (!cpu_has_apic)
		return -ENODEV;

830
	/*
Linus Torvalds's avatar
Linus Torvalds committed
831 832 833 834
	 * 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).
	 */

Len Brown's avatar
Len Brown committed
835
	count =
836
	    acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
Len Brown's avatar
Len Brown committed
837
				  acpi_parse_lapic_addr_ovr, 0);
Linus Torvalds's avatar
Linus Torvalds committed
838
	if (count < 0) {
Len Brown's avatar
Len Brown committed
839 840
		printk(KERN_ERR PREFIX
		       "Error parsing LAPIC address override entry\n");
Linus Torvalds's avatar
Linus Torvalds committed
841 842 843
		return count;
	}

844
	acpi_register_lapic_address(acpi_lapic_addr);
Linus Torvalds's avatar
Linus Torvalds committed
845

846 847 848 849 850 851
	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
				      acpi_parse_sapic, MAX_APICS);

	if (!count)
		count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
					      acpi_parse_lapic, MAX_APICS);
Len Brown's avatar
Len Brown committed
852
	if (!count) {
Linus Torvalds's avatar
Linus Torvalds committed
853 854 855
		printk(KERN_ERR PREFIX "No LAPIC entries present\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return -ENODEV;
Len Brown's avatar
Len Brown committed
856
	} else if (count < 0) {
Linus Torvalds's avatar
Linus Torvalds committed
857 858 859 860 861
		printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return count;
	}

Len Brown's avatar
Len Brown committed
862
	count =
863
	    acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
Linus Torvalds's avatar
Linus Torvalds committed
864 865 866 867 868 869 870
	if (count < 0) {
		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
		/* TBD: Cleanup to allow fallback to MPS */
		return count;
	}
	return 0;
}
Len Brown's avatar
Len Brown committed
871
#endif				/* CONFIG_X86_LOCAL_APIC */
Linus Torvalds's avatar
Linus Torvalds committed
872

873
#ifdef	CONFIG_X86_IO_APIC
874 875
#define MP_ISA_BUS		0

876
#ifdef CONFIG_X86_ES7000
877 878 879
extern int es7000_plat;
#endif

880 881 882 883 884 885
static struct {
	int apic_id;
	int gsi_base;
	int gsi_end;
	DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1);
} mp_ioapic_routing[MAX_IO_APICS];
886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914

static int mp_find_ioapic(int gsi)
{
	int i = 0;

	/* Find the IOAPIC that manages this GSI. */
	for (i = 0; i < nr_ioapics; i++) {
		if ((gsi >= mp_ioapic_routing[i].gsi_base)
		    && (gsi <= mp_ioapic_routing[i].gsi_end))
			return i;
	}

	printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
	return -1;
}

static u8 __init uniq_ioapic_id(u8 id)
{
#ifdef CONFIG_X86_32
	if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
	    !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
		return io_apic_get_unique_id(nr_ioapics, id);
	else
		return id;
#else
	int i;
	DECLARE_BITMAP(used, 256);
	bitmap_zero(used, 256);
	for (i = 0; i < nr_ioapics; i++) {
915 916
		struct mp_config_ioapic *ia = &mp_ioapics[i];
		__set_bit(ia->mp_apicid, used);
917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947
	}
	if (!test_bit(id, used))
		return id;
	return find_first_zero_bit(used, 256);
#endif
}

static int bad_ioapic(unsigned long address)
{
	if (nr_ioapics >= MAX_IO_APICS) {
		printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
		       "(found %d)\n", MAX_IO_APICS, nr_ioapics);
		panic("Recompile kernel with bigger MAX_IO_APICS!\n");
	}
	if (!address) {
		printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
		       " found in table, skipping!\n");
		return 1;
	}
	return 0;
}

void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
{
	int idx = 0;

	if (bad_ioapic(address))
		return;

	idx = nr_ioapics;

948 949 950
	mp_ioapics[idx].mp_type = MP_IOAPIC;
	mp_ioapics[idx].mp_flags = MPC_APIC_USABLE;
	mp_ioapics[idx].mp_apicaddr = address;
951 952

	set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
953
	mp_ioapics[idx].mp_apicid = uniq_ioapic_id(id);
954
#ifdef CONFIG_X86_32
955
	mp_ioapics[idx].mp_apicver = io_apic_get_version(idx);
956
#else
957
	mp_ioapics[idx].mp_apicver = 0;
958 959 960 961 962
#endif
	/*
	 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
	 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
	 */
963
	mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mp_apicid;
964 965 966 967
	mp_ioapic_routing[idx].gsi_base = gsi_base;
	mp_ioapic_routing[idx].gsi_end = gsi_base +
	    io_apic_get_redir_entries(idx);

968 969 970
	printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%lx, "
	       "GSI %d-%d\n", idx, mp_ioapics[idx].mp_apicid,
	       mp_ioapics[idx].mp_apicver, mp_ioapics[idx].mp_apicaddr,
971 972 973 974 975
	       mp_ioapic_routing[idx].gsi_base, mp_ioapic_routing[idx].gsi_end);

	nr_ioapics++;
}

976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001
static void assign_to_mp_irq(struct mp_config_intsrc *m,
				    struct mp_config_intsrc *mp_irq)
{
	memcpy(mp_irq, m, sizeof(struct mp_config_intsrc));
}

static int mp_irq_cmp(struct mp_config_intsrc *mp_irq,
				struct mp_config_intsrc *m)
{
	return memcmp(mp_irq, m, sizeof(struct mp_config_intsrc));
}

static void save_mp_irq(struct mp_config_intsrc *m)
{
	int i;

	for (i = 0; i < mp_irq_entries; i++) {
		if (!mp_irq_cmp(&mp_irqs[i], m))
			return;
	}

	assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
	if (++mp_irq_entries == MAX_IRQ_SOURCES)
		panic("Max # of irq sources exceeded!!\n");
}

1002 1003
void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
{
1004 1005
	int ioapic;
	int pin;
1006
	struct mp_config_intsrc mp_irq;
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023

	/*
	 * Convert 'gsi' to 'ioapic.pin'.
	 */
	ioapic = mp_find_ioapic(gsi);
	if (ioapic < 0)
		return;
	pin = gsi - mp_ioapic_routing[ioapic].gsi_base;

	/*
	 * TBD: This check is for faulty timer entries, where the override
	 *      erroneously sets the trigger to level, resulting in a HUGE
	 *      increase of timer interrupts!
	 */
	if ((bus_irq == 0) && (trigger == 3))
		trigger = 1;

1024 1025 1026 1027 1028 1029 1030
	mp_irq.mp_type = MP_INTSRC;
	mp_irq.mp_irqtype = mp_INT;
	mp_irq.mp_irqflag = (trigger << 2) | polarity;
	mp_irq.mp_srcbus = MP_ISA_BUS;
	mp_irq.mp_srcbusirq = bus_irq;	/* IRQ */
	mp_irq.mp_dstapic = mp_ioapics[ioapic].mp_apicid; /* APIC ID */
	mp_irq.mp_dstirq = pin;	/* INTIN# */
1031

1032
	save_mp_irq(&mp_irq);
1033 1034 1035 1036
}

void __init mp_config_acpi_legacy_irqs(void)
{
1037 1038 1039
	int i;
	int ioapic;
	unsigned int dstapic;
1040
	struct mp_config_intsrc mp_irq;
1041 1042 1043 1044 1045 1046 1047 1048

#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
	/*
	 * Fabricate the legacy ISA bus (bus #31).
	 */
	mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
#endif
	set_bit(MP_ISA_BUS, mp_bus_not_pci);
1049
	pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1050

1051
#ifdef CONFIG_X86_ES7000
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
	/*
	 * Older generations of ES7000 have no legacy identity mappings
	 */
	if (es7000_plat == 1)
		return;
#endif

	/*
	 * Locate the IOAPIC that manages the ISA IRQs (0-15).
	 */
	ioapic = mp_find_ioapic(0);
	if (ioapic < 0)
		return;
1065
	dstapic = mp_ioapics[ioapic].mp_apicid;
1066 1067 1068 1069 1070 1071 1072 1073 1074

	/*
	 * Use the default configuration for the IRQs 0-15.  Unless
	 * overridden by (MADT) interrupt source override entries.
	 */
	for (i = 0; i < 16; i++) {
		int idx;

		for (idx = 0; idx < mp_irq_entries; idx++) {
1075
			struct mp_config_intsrc *irq = mp_irqs + idx;
1076 1077

			/* Do we already have a mapping for this ISA IRQ? */
1078 1079
			if (irq->mp_srcbus == MP_ISA_BUS
			    && irq->mp_srcbusirq == i)
1080 1081 1082
				break;

			/* Do we already have a mapping for this IOAPIC pin */
1083 1084
			if (irq->mp_dstapic == dstapic &&
			    irq->mp_dstirq == i)
1085 1086 1087 1088 1089 1090 1091 1092
				break;
		}

		if (idx != mp_irq_entries) {
			printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
			continue;	/* IRQ already used */
		}

1093 1094 1095 1096 1097 1098 1099
		mp_irq.mp_type = MP_INTSRC;
		mp_irq.mp_irqflag = 0;	/* Conforming */
		mp_irq.mp_srcbus = MP_ISA_BUS;
		mp_irq.mp_dstapic = dstapic;
		mp_irq.mp_irqtype = mp_INT;
		mp_irq.mp_srcbusirq = i; /* Identity mapped */
		mp_irq.mp_dstirq = i;
1100

1101
		save_mp_irq(&mp_irq);
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134