boot.c 45.7 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
u32 acpi_rsdt_forced;
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
	}

242 243
	default_acpi_madt_oem_check(madt->header.oem_id,
				    madt->header.oem_table_id);
Len Brown's avatar
Len Brown committed
244

Linus Torvalds's avatar
Linus Torvalds committed
245 246 247
	return 0;
}

248 249
static void __cpuinit acpi_register_lapic(int id, u8 enabled)
{
Yinghai Lu's avatar
Yinghai Lu committed
250 251
	unsigned int ver = 0;

252 253 254 255 256
	if (!enabled) {
		++disabled_cpus;
		return;
	}

Yinghai Lu's avatar
Yinghai Lu committed
257 258 259 260
	if (boot_cpu_physical_apicid != -1U)
		ver = apic_version[boot_cpu_physical_apicid];

	generic_processor_info(id, ver);
261 262
}

Linus Torvalds's avatar
Linus Torvalds committed
263
static int __init
264
acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
265
{
266
	struct acpi_madt_local_apic *processor = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
267

268
	processor = (struct acpi_madt_local_apic *)header;
Linus Torvalds's avatar
Linus Torvalds committed
269 270 271 272 273 274

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

	acpi_table_print_madt_entry(header);

275 276 277 278 279 280 281
	/*
	 * 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.
	 */
282 283
	acpi_register_lapic(processor->id,	/* APIC ID */
			    processor->lapic_flags & ACPI_MADT_ENABLED);
Linus Torvalds's avatar
Linus Torvalds committed
284 285 286 287

	return 0;
}

288 289 290 291 292 293 294 295 296 297 298 299
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);

300 301
	acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
			    processor->lapic_flags & ACPI_MADT_ENABLED);
302 303 304 305

	return 0;
}

Linus Torvalds's avatar
Linus Torvalds committed
306
static int __init
307
acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
Len Brown's avatar
Len Brown committed
308
			  const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
309
{
310
	struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
311

312
	lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
Linus Torvalds's avatar
Linus Torvalds committed
313 314 315 316 317 318 319 320 321 322

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

	acpi_lapic_addr = lapic_addr_ovr->address;

	return 0;
}

static int __init
323
acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
324
{
325
	struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
326

327
	lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
Linus Torvalds's avatar
Linus Torvalds committed
328 329 330 331 332 333 334 335 336 337 338 339

	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
340
#endif				/*CONFIG_X86_LOCAL_APIC */
Linus Torvalds's avatar
Linus Torvalds committed
341

342
#ifdef CONFIG_X86_IO_APIC
Linus Torvalds's avatar
Linus Torvalds committed
343 344

static int __init
345
acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
346
{
347
	struct acpi_madt_io_apic *ioapic = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
348

349
	ioapic = (struct acpi_madt_io_apic *)header;
Linus Torvalds's avatar
Linus Torvalds committed
350 351 352

	if (BAD_MADT_ENTRY(ioapic, end))
		return -EINVAL;
Len Brown's avatar
Len Brown committed
353

Linus Torvalds's avatar
Linus Torvalds committed
354 355
	acpi_table_print_madt_entry(header);

Len Brown's avatar
Len Brown committed
356 357 358
	mp_register_ioapic(ioapic->id,
			   ioapic->address, ioapic->global_irq_base);

Linus Torvalds's avatar
Linus Torvalds committed
359 360 361 362 363 364
	return 0;
}

/*
 * Parse Interrupt Source Override for the ACPI SCI
 */
365
static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
Linus Torvalds's avatar
Linus Torvalds committed
366 367 368 369 370 371 372 373
{
	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= */
374 375
	if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
		trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
Linus Torvalds's avatar
Linus Torvalds committed
376

377 378
	if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
		polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
Linus Torvalds's avatar
Linus Torvalds committed
379 380

	/*
Len Brown's avatar
Len Brown committed
381
	 * mp_config_acpi_legacy_irqs() already setup IRQs < 16
Linus Torvalds's avatar
Linus Torvalds committed
382 383 384
	 * If GSI is < 16, this will update its flags,
	 * else it will create a new mp_irqs[] entry.
	 */
385
	mp_override_legacy_irq(gsi, polarity, trigger, gsi);
Linus Torvalds's avatar
Linus Torvalds committed
386 387 388

	/*
	 * stash over-ride to indicate we've been here
389
	 * and for later update of acpi_gbl_FADT
Linus Torvalds's avatar
Linus Torvalds committed
390
	 */
391
	acpi_sci_override_gsi = gsi;
Linus Torvalds's avatar
Linus Torvalds committed
392 393 394 395
	return;
}

static int __init
396
acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
Len Brown's avatar
Len Brown committed
397
		       const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
398
{
399
	struct acpi_madt_interrupt_override *intsrc = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
400

401
	intsrc = (struct acpi_madt_interrupt_override *)header;
Linus Torvalds's avatar
Linus Torvalds committed
402 403 404 405 406 407

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

	acpi_table_print_madt_entry(header);

408
	if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
409
		acpi_sci_ioapic_setup(intsrc->global_irq,
410 411
				      intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
				      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
Linus Torvalds's avatar
Linus Torvalds committed
412 413 414 415
		return 0;
	}

	if (acpi_skip_timer_override &&
416
	    intsrc->source_irq == 0 && intsrc->global_irq == 2) {
Len Brown's avatar
Len Brown committed
417 418
		printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
419 420
	}

421 422 423 424
	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
425 426 427 428 429

	return 0;
}

static int __init
430
acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
Linus Torvalds's avatar
Linus Torvalds committed
431
{
432
	struct acpi_madt_nmi_source *nmi_src = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
433

434
	nmi_src = (struct acpi_madt_nmi_source *)header;
Linus Torvalds's avatar
Linus Torvalds committed
435 436 437 438 439 440 441 442 443 444 445

	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
446
#endif				/* CONFIG_X86_IO_APIC */
Linus Torvalds's avatar
Linus Torvalds committed
447 448 449

/*
 * acpi_pic_sci_set_trigger()
450
 *
Linus Torvalds's avatar
Linus Torvalds committed
451 452 453 454 455 456 457
 * 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
458 459
 * 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
460 461
 */

Len Brown's avatar
Len Brown committed
462
void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
Linus Torvalds's avatar
Linus Torvalds committed
463 464 465 466 467 468 469 470
{
	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
471
	 * If we use ACPI to set PCI IRQs, then we should clear ELCR
Linus Torvalds's avatar
Linus Torvalds committed
472 473 474 475 476 477 478 479 480 481
	 * 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
482
	case 1:		/* Edge - clear */
Linus Torvalds's avatar
Linus Torvalds committed
483 484
		new &= ~mask;
		break;
Len Brown's avatar
Len Brown committed
485
	case 3:		/* Level - set */
Linus Torvalds's avatar
Linus Torvalds committed
486 487 488 489 490 491 492 493 494 495 496 497 498 499
		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)
{
500
	*irq = gsi;
Linus Torvalds's avatar
Linus Torvalds committed
501 502 503
	return 0;
}

504 505 506 507
/*
 * success: return IRQ number (>=0)
 * failure: return < 0
 */
508
int acpi_register_gsi(u32 gsi, int triggering, int polarity)
Linus Torvalds's avatar
Linus Torvalds committed
509 510 511 512 513 514 515 516 517
{
	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) {
518
		if (triggering == ACPI_LEVEL_SENSITIVE)
Len Brown's avatar
Len Brown committed
519
			eisa_set_level_irq(gsi);
Linus Torvalds's avatar
Linus Torvalds committed
520 521 522 523 524
	}
#endif

#ifdef CONFIG_X86_IO_APIC
	if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
525
		plat_gsi = mp_register_gsi(gsi, triggering, polarity);
Linus Torvalds's avatar
Linus Torvalds committed
526 527 528 529 530
	}
#endif
	acpi_gsi_to_irq(plat_gsi, &irq);
	return irq;
}
Len Brown's avatar
Len Brown committed
531

Linus Torvalds's avatar
Linus Torvalds committed
532 533 534 535
/*
 *  ACPI based hotplug support for CPU
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
536 537

static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
Linus Torvalds's avatar
Linus Torvalds committed
538
{
539 540
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
541
	struct acpi_madt_local_apic *lapic;
542
	cpumask_var_t tmp_map, new_map;
543 544
	u8 physid;
	int cpu;
545
	int retval = -ENOMEM;
546 547 548 549 550 551 552 553 554 555 556 557 558 559

	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;
	}

560
	lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
561

562 563
	if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
	    !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
564 565 566 567 568 569 570 571 572 573
		kfree(buffer.pointer);
		return -EINVAL;
	}

	physid = lapic->id;

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

574 575 576 577 578 579 580
	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);
581
	acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
582 583 584 585 586

	/*
	 * If mp_register_lapic successfully generates a new logical cpu
	 * number, then the following will get us exactly what was mapped
	 */
587 588
	cpumask_andnot(new_map, cpu_present_mask, tmp_map);
	if (cpumask_empty(new_map)) {
589
		printk ("Unable to map lapic to logical cpu number\n");
590 591
		retval = -EINVAL;
		goto free_new_map;
592 593
	}

594
	cpu = cpumask_first(new_map);
595 596

	*pcpu = cpu;
597 598 599 600 601 602 603 604
	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
605 606
}

607 608 609 610 611
/* 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
612
EXPORT_SYMBOL(acpi_map_lsapic);
Linus Torvalds's avatar
Linus Torvalds committed
613

Len Brown's avatar
Len Brown committed
614
int acpi_unmap_lsapic(int cpu)
Linus Torvalds's avatar
Linus Torvalds committed
615
{
616
	per_cpu(x86_cpu_to_apicid, cpu) = -1;
617
	set_cpu_present(cpu, false);
618 619 620
	num_processors--;

	return (0);
Linus Torvalds's avatar
Linus Torvalds committed
621
}
Len Brown's avatar
Len Brown committed
622

Linus Torvalds's avatar
Linus Torvalds committed
623
EXPORT_SYMBOL(acpi_unmap_lsapic);
Len Brown's avatar
Len Brown committed
624
#endif				/* CONFIG_ACPI_HOTPLUG_CPU */
Linus Torvalds's avatar
Linus Torvalds committed
625

Len Brown's avatar
Len Brown committed
626
int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
627 628 629 630
{
	/* TBD */
	return -EINVAL;
}
Len Brown's avatar
Len Brown committed
631

632 633
EXPORT_SYMBOL(acpi_register_ioapic);

Len Brown's avatar
Len Brown committed
634
int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
635 636 637 638
{
	/* TBD */
	return -EINVAL;
}
Len Brown's avatar
Len Brown committed
639

640 641
EXPORT_SYMBOL(acpi_unregister_ioapic);

642
static int __init acpi_parse_sbf(struct acpi_table_header *table)
Linus Torvalds's avatar
Linus Torvalds committed
643
{
644
	struct acpi_table_boot *sb;
Linus Torvalds's avatar
Linus Torvalds committed
645

646
	sb = (struct acpi_table_boot *)table;
Linus Torvalds's avatar
Linus Torvalds committed
647 648 649 650 651
	if (!sb) {
		printk(KERN_WARNING PREFIX "Unable to map SBF\n");
		return -ENODEV;
	}

652
	sbf_port = sb->cmos_index;	/* Save CMOS port */
Linus Torvalds's avatar
Linus Torvalds committed
653 654 655 656 657

	return 0;
}

#ifdef CONFIG_HPET_TIMER
658
#include <asm/hpet.h>
Linus Torvalds's avatar
Linus Torvalds committed
659

660 661
static struct __initdata resource *hpet_res;

662
static int __init acpi_parse_hpet(struct acpi_table_header *table)
Linus Torvalds's avatar
Linus Torvalds committed
663 664 665
{
	struct acpi_table_hpet *hpet_tbl;

666
	hpet_tbl = (struct acpi_table_hpet *)table;
Linus Torvalds's avatar
Linus Torvalds committed
667 668 669 670 671
	if (!hpet_tbl) {
		printk(KERN_WARNING PREFIX "Unable to map HPET\n");
		return -ENODEV;
	}

672
	if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
Linus Torvalds's avatar
Linus Torvalds committed
673 674 675 676
		printk(KERN_WARNING PREFIX "HPET timers must be located in "
		       "memory.\n");
		return -1;
	}
677

678
	hpet_address = hpet_tbl->address.address;
Thomas Gleixner's avatar
Thomas Gleixner committed
679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710

	/*
	 * 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
711
	printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
712
	       hpet_tbl->id, hpet_address);
Linus Torvalds's avatar
Linus Torvalds committed
713

714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
	/*
	 * 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
729 730
	return 0;
}
731 732 733 734 735 736 737 738 739 740 741 742 743 744 745

/*
 * 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
746 747 748 749
#else
#define	acpi_parse_hpet	NULL
#endif

750
static int __init acpi_parse_fadt(struct acpi_table_header *table)
Linus Torvalds's avatar
Linus Torvalds committed
751
{
Jason Davis's avatar
Jason Davis committed
752

Linus Torvalds's avatar
Linus Torvalds committed
753 754
#ifdef CONFIG_X86_PM_TIMER
	/* detect the location of the ACPI PM Timer */
755
	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
Linus Torvalds's avatar
Linus Torvalds committed
756
		/* FADT rev. 2 */
757
		if (acpi_gbl_FADT.xpm_timer_block.space_id !=
Len Brown's avatar
Len Brown committed
758
		    ACPI_ADR_SPACE_SYSTEM_IO)
Linus Torvalds's avatar
Linus Torvalds committed
759 760
			return 0;

761
		pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
762 763 764 765 766 767
		/*
		 * "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)
768
			pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
Linus Torvalds's avatar
Linus Torvalds committed
769 770
	} else {
		/* FADT rev. 1 */
771
		pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
Linus Torvalds's avatar
Linus Torvalds committed
772 773
	}
	if (pmtmr_ioport)
Len Brown's avatar
Len Brown committed
774 775
		printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
		       pmtmr_ioport);
Linus Torvalds's avatar
Linus Torvalds committed
776 777 778 779 780 781 782 783 784
#endif
	return 0;
}

#ifdef	CONFIG_X86_LOCAL_APIC
/*
 * Parse LAPIC entries in MADT
 * returns 0 on success, < 0 on error
 */
785 786 787 788 789 790

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
791
	if (boot_cpu_physical_apicid == -1U) {
792
		boot_cpu_physical_apicid  = read_apic_id();
Yinghai Lu's avatar
Yinghai Lu committed
793 794 795
		apic_version[boot_cpu_physical_apicid] =
			 GET_APIC_VERSION(apic_read(APIC_LVR));
	}
796 797
}

798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
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
824
static int __init acpi_parse_madt_lapic_entries(void)
Linus Torvalds's avatar
Linus Torvalds committed
825 826 827
{
	int count;

828 829 830
	if (!cpu_has_apic)
		return -ENODEV;

831
	/*
Linus Torvalds's avatar
Linus Torvalds committed
832 833 834 835
	 * 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
836
	count =
837
	    acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
Len Brown's avatar
Len Brown committed
838
				  acpi_parse_lapic_addr_ovr, 0);
Linus Torvalds's avatar
Linus Torvalds committed
839
	if (count < 0) {
Len Brown's avatar
Len Brown committed
840 841
		printk(KERN_ERR PREFIX
		       "Error parsing LAPIC address override entry\n");
Linus Torvalds's avatar
Linus Torvalds committed
842 843 844
		return count;
	}

845
	acpi_register_lapic_address(acpi_lapic_addr);
Linus Torvalds's avatar
Linus Torvalds committed
846

847 848 849 850 851 852
	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
853
	if (!count) {
Linus Torvalds's avatar
Linus Torvalds committed
854 855 856
		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
857
	} else if (count < 0) {
Linus Torvalds's avatar
Linus Torvalds committed
858 859 860 861 862
		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
863
	count =
864
	    acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
Linus Torvalds's avatar
Linus Torvalds committed
865 866 867 868 869 870 871
	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
872
#endif				/* CONFIG_X86_LOCAL_APIC */
Linus Torvalds's avatar
Linus Torvalds committed
873

874
#ifdef	CONFIG_X86_IO_APIC
875 876
#define MP_ISA_BUS		0

877
#ifdef CONFIG_X86_ES7000
878 879 880
extern int es7000_plat;
#endif

881 882 883 884 885 886
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];
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915

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++) {
916 917
		struct mpc_ioapic *ia = &mp_ioapics[i];
		__set_bit(ia->apicid, used);
918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948
	}
	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;

949 950 951
	mp_ioapics[idx].type = MP_IOAPIC;
	mp_ioapics[idx].flags = MPC_APIC_USABLE;
	mp_ioapics[idx].apicaddr = address;
952 953

	set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
954
	mp_ioapics[idx].apicid = uniq_ioapic_id(id);
955
#ifdef CONFIG_X86_32
956
	mp_ioapics[idx].apicver = io_apic_get_version(idx);
957
#else
958
	mp_ioapics[idx].apicver = 0;
959 960 961 962 963
#endif
	/*
	 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
	 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
	 */
964
	mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].apicid;
965 966 967 968
	mp_ioapic_routing[idx].gsi_base = gsi_base;
	mp_ioapic_routing[idx].gsi_end = gsi_base +
	    io_apic_get_redir_entries(idx);

969 970 971
	printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
	       "GSI %d-%d\n", idx, mp_ioapics[idx].apicid,
	       mp_ioapics[idx].apicver, mp_ioapics[idx].apicaddr,
972 973 974 975 976
	       mp_ioapic_routing[idx].gsi_base, mp_ioapic_routing[idx].gsi_end);

	nr_ioapics++;
}

977 978
static void assign_to_mp_irq(struct mpc_intsrc *m,
				    struct mpc_intsrc *mp_irq)
979
{
980
	memcpy(mp_irq, m, sizeof(struct mpc_intsrc));
981 982
}

983 984
static int mp_irq_cmp(struct mpc_intsrc *mp_irq,
				struct mpc_intsrc *m)
985
{
986
	return memcmp(mp_irq, m, sizeof(struct mpc_intsrc));
987 988
}

989
static void save_mp_irq(struct mpc_intsrc *m)
990 991 992 993 994 995 996 997 998 999 1000 1001 1002
{
	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");
}

1003 1004
void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
{
1005 1006
	int ioapic;
	int pin;
1007
	struct mpc_intsrc mp_irq;
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024

	/*
	 * 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;

1025 1026 1027 1028 1029 1030 1031
	mp_irq.type = MP_INTSRC;
	mp_irq.irqtype = mp_INT;
	mp_irq.irqflag = (trigger << 2) | polarity;
	mp_irq.srcbus = MP_ISA_BUS;
	mp_irq.srcbusirq = bus_irq;	/* IRQ */
	mp_irq.dstapic = mp_ioapics[ioapic].apicid; /* APIC ID */
	mp_irq.dstirq = pin;	/* INTIN# */
1032

1033
	save_mp_irq(&mp_irq);
1034 1035 1036 1037
}

void __init mp_config_acpi_legacy_irqs(void)
{
1038 1039 1040
	int i;
	int ioapic;
	unsigned int dstapic;
1041
	struct mpc_intsrc mp_irq;
1042 1043 1044 1045 1046 1047 1048 1049

#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);
1050
	pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);
1051

1052
#ifdef CONFIG_X86_ES7000
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
	/*
	 * 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;
1066
	dstapic = mp_ioapics[ioapic].apicid;
1067 1068 1069 1070 1071 1072 1073 1074 1075

	/*
	 * 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++) {
1076
			struct mpc_intsrc *irq = mp_irqs + idx;
1077 1078

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

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

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

1092 1093 1094 1095 1096 1097 1098
		mp_irq.type = MP_INTSRC;
		mp_irq.irqflag = 0;	/* Conforming */
		mp_irq.srcbus = MP_ISA_BUS;
		mp_irq.dstapic = dstapic;
		mp_irq.irqtype = mp_INT;
		mp_irq.srcbusir