xref: /openbmc/linux/arch/ia64/kernel/acpi.c (revision e23feb16)
1 /*
2  *  acpi.c - Architecture-Specific Low-Level ACPI Support
3  *
4  *  Copyright (C) 1999 VA Linux Systems
5  *  Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
6  *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
7  *	David Mosberger-Tang <davidm@hpl.hp.com>
8  *  Copyright (C) 2000 Intel Corp.
9  *  Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
10  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
11  *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
12  *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
13  *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
14  *  Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
15  *
16  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
17  *
18  *  This program is free software; you can redistribute it and/or modify
19  *  it under the terms of the GNU General Public License as published by
20  *  the Free Software Foundation; either version 2 of the License, or
21  *  (at your option) any later version.
22  *
23  *  This program is distributed in the hope that it will be useful,
24  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
25  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
26  *  GNU General Public License for more details.
27  *
28  *  You should have received a copy of the GNU General Public License
29  *  along with this program; if not, write to the Free Software
30  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31  *
32  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
33  */
34 
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/sched.h>
39 #include <linux/smp.h>
40 #include <linux/string.h>
41 #include <linux/types.h>
42 #include <linux/irq.h>
43 #include <linux/acpi.h>
44 #include <linux/efi.h>
45 #include <linux/mmzone.h>
46 #include <linux/nodemask.h>
47 #include <linux/slab.h>
48 #include <acpi/processor.h>
49 #include <asm/io.h>
50 #include <asm/iosapic.h>
51 #include <asm/machvec.h>
52 #include <asm/page.h>
53 #include <asm/numa.h>
54 #include <asm/sal.h>
55 #include <asm/cyclone.h>
56 #include <asm/xen/hypervisor.h>
57 
58 #define BAD_MADT_ENTRY(entry, end) (                                        \
59 		(!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
60 		((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
61 
62 #define PREFIX			"ACPI: "
63 
64 u32 acpi_rsdt_forced;
65 unsigned int acpi_cpei_override;
66 unsigned int acpi_cpei_phys_cpuid;
67 
68 unsigned long acpi_wakeup_address = 0;
69 
70 #ifdef CONFIG_IA64_GENERIC
71 static unsigned long __init acpi_find_rsdp(void)
72 {
73 	unsigned long rsdp_phys = 0;
74 
75 	if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
76 		rsdp_phys = efi.acpi20;
77 	else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
78 		printk(KERN_WARNING PREFIX
79 		       "v1.0/r0.71 tables no longer supported\n");
80 	return rsdp_phys;
81 }
82 
83 const char __init *
84 acpi_get_sysname(void)
85 {
86 	unsigned long rsdp_phys;
87 	struct acpi_table_rsdp *rsdp;
88 	struct acpi_table_xsdt *xsdt;
89 	struct acpi_table_header *hdr;
90 #ifdef CONFIG_INTEL_IOMMU
91 	u64 i, nentries;
92 #endif
93 
94 	rsdp_phys = acpi_find_rsdp();
95 	if (!rsdp_phys) {
96 		printk(KERN_ERR
97 		       "ACPI 2.0 RSDP not found, default to \"dig\"\n");
98 		return "dig";
99 	}
100 
101 	rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
102 	if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
103 		printk(KERN_ERR
104 		       "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
105 		return "dig";
106 	}
107 
108 	xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
109 	hdr = &xsdt->header;
110 	if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
111 		printk(KERN_ERR
112 		       "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
113 		return "dig";
114 	}
115 
116 	if (!strcmp(hdr->oem_id, "HP")) {
117 		return "hpzx1";
118 	} else if (!strcmp(hdr->oem_id, "SGI")) {
119 		if (!strcmp(hdr->oem_table_id + 4, "UV"))
120 			return "uv";
121 		else
122 			return "sn2";
123 	} else if (xen_pv_domain() && !strcmp(hdr->oem_id, "XEN")) {
124 		return "xen";
125 	}
126 
127 #ifdef CONFIG_INTEL_IOMMU
128 	/* Look for Intel IOMMU */
129 	nentries = (hdr->length - sizeof(*hdr)) /
130 			 sizeof(xsdt->table_offset_entry[0]);
131 	for (i = 0; i < nentries; i++) {
132 		hdr = __va(xsdt->table_offset_entry[i]);
133 		if (strncmp(hdr->signature, ACPI_SIG_DMAR,
134 			sizeof(ACPI_SIG_DMAR) - 1) == 0)
135 			return "dig_vtd";
136 	}
137 #endif
138 
139 	return "dig";
140 }
141 #endif /* CONFIG_IA64_GENERIC */
142 
143 #define ACPI_MAX_PLATFORM_INTERRUPTS	256
144 
145 /* Array to record platform interrupt vectors for generic interrupt routing. */
146 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
147 	[0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
148 };
149 
150 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
151 
152 /*
153  * Interrupt routing API for device drivers.  Provides interrupt vector for
154  * a generic platform event.  Currently only CPEI is implemented.
155  */
156 int acpi_request_vector(u32 int_type)
157 {
158 	int vector = -1;
159 
160 	if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
161 		/* corrected platform error interrupt */
162 		vector = platform_intr_list[int_type];
163 	} else
164 		printk(KERN_ERR
165 		       "acpi_request_vector(): invalid interrupt type\n");
166 	return vector;
167 }
168 
169 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
170 {
171 	return __va(phys_addr);
172 }
173 
174 void __init __acpi_unmap_table(char *map, unsigned long size)
175 {
176 }
177 
178 /* --------------------------------------------------------------------------
179                             Boot-time Table Parsing
180    -------------------------------------------------------------------------- */
181 
182 static int available_cpus __initdata;
183 struct acpi_table_madt *acpi_madt __initdata;
184 static u8 has_8259;
185 
186 static int __init
187 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
188 			  const unsigned long end)
189 {
190 	struct acpi_madt_local_apic_override *lapic;
191 
192 	lapic = (struct acpi_madt_local_apic_override *)header;
193 
194 	if (BAD_MADT_ENTRY(lapic, end))
195 		return -EINVAL;
196 
197 	if (lapic->address) {
198 		iounmap(ipi_base_addr);
199 		ipi_base_addr = ioremap(lapic->address, 0);
200 	}
201 	return 0;
202 }
203 
204 static int __init
205 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
206 {
207 	struct acpi_madt_local_sapic *lsapic;
208 
209 	lsapic = (struct acpi_madt_local_sapic *)header;
210 
211 	/*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
212 
213 	if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
214 #ifdef CONFIG_SMP
215 		smp_boot_data.cpu_phys_id[available_cpus] =
216 		    (lsapic->id << 8) | lsapic->eid;
217 #endif
218 		++available_cpus;
219 	}
220 
221 	total_cpus++;
222 	return 0;
223 }
224 
225 static int __init
226 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
227 {
228 	struct acpi_madt_local_apic_nmi *lacpi_nmi;
229 
230 	lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
231 
232 	if (BAD_MADT_ENTRY(lacpi_nmi, end))
233 		return -EINVAL;
234 
235 	/* TBD: Support lapic_nmi entries */
236 	return 0;
237 }
238 
239 static int __init
240 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
241 {
242 	struct acpi_madt_io_sapic *iosapic;
243 
244 	iosapic = (struct acpi_madt_io_sapic *)header;
245 
246 	if (BAD_MADT_ENTRY(iosapic, end))
247 		return -EINVAL;
248 
249 	return iosapic_init(iosapic->address, iosapic->global_irq_base);
250 }
251 
252 static unsigned int __initdata acpi_madt_rev;
253 
254 static int __init
255 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
256 			const unsigned long end)
257 {
258 	struct acpi_madt_interrupt_source *plintsrc;
259 	int vector;
260 
261 	plintsrc = (struct acpi_madt_interrupt_source *)header;
262 
263 	if (BAD_MADT_ENTRY(plintsrc, end))
264 		return -EINVAL;
265 
266 	/*
267 	 * Get vector assignment for this interrupt, set attributes,
268 	 * and program the IOSAPIC routing table.
269 	 */
270 	vector = iosapic_register_platform_intr(plintsrc->type,
271 						plintsrc->global_irq,
272 						plintsrc->io_sapic_vector,
273 						plintsrc->eid,
274 						plintsrc->id,
275 						((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
276 						 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
277 						IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
278 						((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
279 						 ACPI_MADT_TRIGGER_EDGE) ?
280 						IOSAPIC_EDGE : IOSAPIC_LEVEL);
281 
282 	platform_intr_list[plintsrc->type] = vector;
283 	if (acpi_madt_rev > 1) {
284 		acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
285 	}
286 
287 	/*
288 	 * Save the physical id, so we can check when its being removed
289 	 */
290 	acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
291 
292 	return 0;
293 }
294 
295 #ifdef CONFIG_HOTPLUG_CPU
296 unsigned int can_cpei_retarget(void)
297 {
298 	extern int cpe_vector;
299 	extern unsigned int force_cpei_retarget;
300 
301 	/*
302 	 * Only if CPEI is supported and the override flag
303 	 * is present, otherwise return that its re-targettable
304 	 * if we are in polling mode.
305 	 */
306 	if (cpe_vector > 0) {
307 		if (acpi_cpei_override || force_cpei_retarget)
308 			return 1;
309 		else
310 			return 0;
311 	}
312 	return 1;
313 }
314 
315 unsigned int is_cpu_cpei_target(unsigned int cpu)
316 {
317 	unsigned int logical_id;
318 
319 	logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
320 
321 	if (logical_id == cpu)
322 		return 1;
323 	else
324 		return 0;
325 }
326 
327 void set_cpei_target_cpu(unsigned int cpu)
328 {
329 	acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
330 }
331 #endif
332 
333 unsigned int get_cpei_target_cpu(void)
334 {
335 	return acpi_cpei_phys_cpuid;
336 }
337 
338 static int __init
339 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
340 		       const unsigned long end)
341 {
342 	struct acpi_madt_interrupt_override *p;
343 
344 	p = (struct acpi_madt_interrupt_override *)header;
345 
346 	if (BAD_MADT_ENTRY(p, end))
347 		return -EINVAL;
348 
349 	iosapic_override_isa_irq(p->source_irq, p->global_irq,
350 				 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
351 				  ACPI_MADT_POLARITY_ACTIVE_LOW) ?
352 				 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
353 				 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
354 				 ACPI_MADT_TRIGGER_LEVEL) ?
355 				 IOSAPIC_LEVEL : IOSAPIC_EDGE);
356 	return 0;
357 }
358 
359 static int __init
360 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
361 {
362 	struct acpi_madt_nmi_source *nmi_src;
363 
364 	nmi_src = (struct acpi_madt_nmi_source *)header;
365 
366 	if (BAD_MADT_ENTRY(nmi_src, end))
367 		return -EINVAL;
368 
369 	/* TBD: Support nimsrc entries */
370 	return 0;
371 }
372 
373 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
374 {
375 	if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
376 
377 		/*
378 		 * Unfortunately ITC_DRIFT is not yet part of the
379 		 * official SAL spec, so the ITC_DRIFT bit is not
380 		 * set by the BIOS on this hardware.
381 		 */
382 		sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
383 
384 		cyclone_setup();
385 	}
386 }
387 
388 static int __init acpi_parse_madt(struct acpi_table_header *table)
389 {
390 	if (!table)
391 		return -EINVAL;
392 
393 	acpi_madt = (struct acpi_table_madt *)table;
394 
395 	acpi_madt_rev = acpi_madt->header.revision;
396 
397 	/* remember the value for reference after free_initmem() */
398 #ifdef CONFIG_ITANIUM
399 	has_8259 = 1;		/* Firmware on old Itanium systems is broken */
400 #else
401 	has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
402 #endif
403 	iosapic_system_init(has_8259);
404 
405 	/* Get base address of IPI Message Block */
406 
407 	if (acpi_madt->address)
408 		ipi_base_addr = ioremap(acpi_madt->address, 0);
409 
410 	printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
411 
412 	acpi_madt_oem_check(acpi_madt->header.oem_id,
413 			    acpi_madt->header.oem_table_id);
414 
415 	return 0;
416 }
417 
418 #ifdef CONFIG_ACPI_NUMA
419 
420 #undef SLIT_DEBUG
421 
422 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
423 
424 static int __initdata srat_num_cpus;	/* number of cpus */
425 static u32 pxm_flag[PXM_FLAG_LEN];
426 #define pxm_bit_set(bit)	(set_bit(bit,(void *)pxm_flag))
427 #define pxm_bit_test(bit)	(test_bit(bit,(void *)pxm_flag))
428 static struct acpi_table_slit __initdata *slit_table;
429 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
430 
431 static int __init
432 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
433 {
434 	int pxm;
435 
436 	pxm = pa->proximity_domain_lo;
437 	if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
438 		pxm += pa->proximity_domain_hi[0] << 8;
439 	return pxm;
440 }
441 
442 static int __init
443 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
444 {
445 	int pxm;
446 
447 	pxm = ma->proximity_domain;
448 	if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
449 		pxm &= 0xff;
450 
451 	return pxm;
452 }
453 
454 /*
455  * ACPI 2.0 SLIT (System Locality Information Table)
456  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
457  */
458 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
459 {
460 	u32 len;
461 
462 	len = sizeof(struct acpi_table_header) + 8
463 	    + slit->locality_count * slit->locality_count;
464 	if (slit->header.length != len) {
465 		printk(KERN_ERR
466 		       "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
467 		       len, slit->header.length);
468 		return;
469 	}
470 	slit_table = slit;
471 }
472 
473 void __init
474 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
475 {
476 	int pxm;
477 
478 	if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
479 		return;
480 
481 	if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
482 		printk_once(KERN_WARNING
483 			    "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
484 			    ARRAY_SIZE(node_cpuid));
485 		return;
486 	}
487 	pxm = get_processor_proximity_domain(pa);
488 
489 	/* record this node in proximity bitmap */
490 	pxm_bit_set(pxm);
491 
492 	node_cpuid[srat_num_cpus].phys_id =
493 	    (pa->apic_id << 8) | (pa->local_sapic_eid);
494 	/* nid should be overridden as logical node id later */
495 	node_cpuid[srat_num_cpus].nid = pxm;
496 	cpu_set(srat_num_cpus, early_cpu_possible_map);
497 	srat_num_cpus++;
498 }
499 
500 int __init
501 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
502 {
503 	unsigned long paddr, size;
504 	int pxm;
505 	struct node_memblk_s *p, *q, *pend;
506 
507 	pxm = get_memory_proximity_domain(ma);
508 
509 	/* fill node memory chunk structure */
510 	paddr = ma->base_address;
511 	size = ma->length;
512 
513 	/* Ignore disabled entries */
514 	if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
515 		return -1;
516 
517 	/* record this node in proximity bitmap */
518 	pxm_bit_set(pxm);
519 
520 	/* Insertion sort based on base address */
521 	pend = &node_memblk[num_node_memblks];
522 	for (p = &node_memblk[0]; p < pend; p++) {
523 		if (paddr < p->start_paddr)
524 			break;
525 	}
526 	if (p < pend) {
527 		for (q = pend - 1; q >= p; q--)
528 			*(q + 1) = *q;
529 	}
530 	p->start_paddr = paddr;
531 	p->size = size;
532 	p->nid = pxm;
533 	num_node_memblks++;
534 	return 0;
535 }
536 
537 void __init acpi_numa_arch_fixup(void)
538 {
539 	int i, j, node_from, node_to;
540 
541 	/* If there's no SRAT, fix the phys_id and mark node 0 online */
542 	if (srat_num_cpus == 0) {
543 		node_set_online(0);
544 		node_cpuid[0].phys_id = hard_smp_processor_id();
545 		return;
546 	}
547 
548 	/*
549 	 * MCD - This can probably be dropped now.  No need for pxm ID to node ID
550 	 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
551 	 */
552 	nodes_clear(node_online_map);
553 	for (i = 0; i < MAX_PXM_DOMAINS; i++) {
554 		if (pxm_bit_test(i)) {
555 			int nid = acpi_map_pxm_to_node(i);
556 			node_set_online(nid);
557 		}
558 	}
559 
560 	/* set logical node id in memory chunk structure */
561 	for (i = 0; i < num_node_memblks; i++)
562 		node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
563 
564 	/* assign memory bank numbers for each chunk on each node */
565 	for_each_online_node(i) {
566 		int bank;
567 
568 		bank = 0;
569 		for (j = 0; j < num_node_memblks; j++)
570 			if (node_memblk[j].nid == i)
571 				node_memblk[j].bank = bank++;
572 	}
573 
574 	/* set logical node id in cpu structure */
575 	for_each_possible_early_cpu(i)
576 		node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
577 
578 	printk(KERN_INFO "Number of logical nodes in system = %d\n",
579 	       num_online_nodes());
580 	printk(KERN_INFO "Number of memory chunks in system = %d\n",
581 	       num_node_memblks);
582 
583 	if (!slit_table) {
584 		for (i = 0; i < MAX_NUMNODES; i++)
585 			for (j = 0; j < MAX_NUMNODES; j++)
586 				node_distance(i, j) = i == j ? LOCAL_DISTANCE :
587 							REMOTE_DISTANCE;
588 		return;
589 	}
590 
591 	memset(numa_slit, -1, sizeof(numa_slit));
592 	for (i = 0; i < slit_table->locality_count; i++) {
593 		if (!pxm_bit_test(i))
594 			continue;
595 		node_from = pxm_to_node(i);
596 		for (j = 0; j < slit_table->locality_count; j++) {
597 			if (!pxm_bit_test(j))
598 				continue;
599 			node_to = pxm_to_node(j);
600 			node_distance(node_from, node_to) =
601 			    slit_table->entry[i * slit_table->locality_count + j];
602 		}
603 	}
604 
605 #ifdef SLIT_DEBUG
606 	printk("ACPI 2.0 SLIT locality table:\n");
607 	for_each_online_node(i) {
608 		for_each_online_node(j)
609 		    printk("%03d ", node_distance(i, j));
610 		printk("\n");
611 	}
612 #endif
613 }
614 #endif				/* CONFIG_ACPI_NUMA */
615 
616 /*
617  * success: return IRQ number (>=0)
618  * failure: return < 0
619  */
620 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
621 {
622 	if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
623 		return gsi;
624 
625 	if (has_8259 && gsi < 16)
626 		return isa_irq_to_vector(gsi);
627 
628 	return iosapic_register_intr(gsi,
629 				     (polarity ==
630 				      ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
631 				     IOSAPIC_POL_LOW,
632 				     (triggering ==
633 				      ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
634 				     IOSAPIC_LEVEL);
635 }
636 EXPORT_SYMBOL_GPL(acpi_register_gsi);
637 
638 void acpi_unregister_gsi(u32 gsi)
639 {
640 	if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
641 		return;
642 
643 	if (has_8259 && gsi < 16)
644 		return;
645 
646 	iosapic_unregister_intr(gsi);
647 }
648 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
649 
650 static int __init acpi_parse_fadt(struct acpi_table_header *table)
651 {
652 	struct acpi_table_header *fadt_header;
653 	struct acpi_table_fadt *fadt;
654 
655 	if (!table)
656 		return -EINVAL;
657 
658 	fadt_header = (struct acpi_table_header *)table;
659 	if (fadt_header->revision != 3)
660 		return -ENODEV;	/* Only deal with ACPI 2.0 FADT */
661 
662 	fadt = (struct acpi_table_fadt *)fadt_header;
663 
664 	acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
665 				 ACPI_ACTIVE_LOW);
666 	return 0;
667 }
668 
669 int __init early_acpi_boot_init(void)
670 {
671 	int ret;
672 
673 	/*
674 	 * do a partial walk of MADT to determine how many CPUs
675 	 * we have including offline CPUs
676 	 */
677 	if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
678 		printk(KERN_ERR PREFIX "Can't find MADT\n");
679 		return 0;
680 	}
681 
682 	ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
683 		acpi_parse_lsapic, NR_CPUS);
684 	if (ret < 1)
685 		printk(KERN_ERR PREFIX
686 		       "Error parsing MADT - no LAPIC entries\n");
687 
688 #ifdef CONFIG_SMP
689 	if (available_cpus == 0) {
690 		printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
691 		printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
692 		smp_boot_data.cpu_phys_id[available_cpus] =
693 		    hard_smp_processor_id();
694 		available_cpus = 1;	/* We've got at least one of these, no? */
695 	}
696 	smp_boot_data.cpu_count = available_cpus;
697 #endif
698 	/* Make boot-up look pretty */
699 	printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
700 	       total_cpus);
701 
702 	return 0;
703 }
704 
705 int __init acpi_boot_init(void)
706 {
707 
708 	/*
709 	 * MADT
710 	 * ----
711 	 * Parse the Multiple APIC Description Table (MADT), if exists.
712 	 * Note that this table provides platform SMP configuration
713 	 * information -- the successor to MPS tables.
714 	 */
715 
716 	if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
717 		printk(KERN_ERR PREFIX "Can't find MADT\n");
718 		goto skip_madt;
719 	}
720 
721 	/* Local APIC */
722 
723 	if (acpi_table_parse_madt
724 	    (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
725 		printk(KERN_ERR PREFIX
726 		       "Error parsing LAPIC address override entry\n");
727 
728 	if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
729 	    < 0)
730 		printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
731 
732 	/* I/O APIC */
733 
734 	if (acpi_table_parse_madt
735 	    (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
736 		if (!ia64_platform_is("sn2"))
737 			printk(KERN_ERR PREFIX
738 			       "Error parsing MADT - no IOSAPIC entries\n");
739 	}
740 
741 	/* System-Level Interrupt Routing */
742 
743 	if (acpi_table_parse_madt
744 	    (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
745 	     ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
746 		printk(KERN_ERR PREFIX
747 		       "Error parsing platform interrupt source entry\n");
748 
749 	if (acpi_table_parse_madt
750 	    (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
751 		printk(KERN_ERR PREFIX
752 		       "Error parsing interrupt source overrides entry\n");
753 
754 	if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
755 		printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
756       skip_madt:
757 
758 	/*
759 	 * FADT says whether a legacy keyboard controller is present.
760 	 * The FADT also contains an SCI_INT line, by which the system
761 	 * gets interrupts such as power and sleep buttons.  If it's not
762 	 * on a Legacy interrupt, it needs to be setup.
763 	 */
764 	if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
765 		printk(KERN_ERR PREFIX "Can't find FADT\n");
766 
767 #ifdef CONFIG_ACPI_NUMA
768 #ifdef CONFIG_SMP
769 	if (srat_num_cpus == 0) {
770 		int cpu, i = 1;
771 		for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
772 			if (smp_boot_data.cpu_phys_id[cpu] !=
773 			    hard_smp_processor_id())
774 				node_cpuid[i++].phys_id =
775 				    smp_boot_data.cpu_phys_id[cpu];
776 	}
777 #endif
778 	build_cpu_to_node_map();
779 #endif
780 	return 0;
781 }
782 
783 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
784 {
785 	int tmp;
786 
787 	if (has_8259 && gsi < 16)
788 		*irq = isa_irq_to_vector(gsi);
789 	else {
790 		tmp = gsi_to_irq(gsi);
791 		if (tmp == -1)
792 			return -1;
793 		*irq = tmp;
794 	}
795 	return 0;
796 }
797 
798 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
799 {
800 	if (isa_irq >= 16)
801 		return -1;
802 	*gsi = isa_irq;
803 	return 0;
804 }
805 
806 /*
807  *  ACPI based hotplug CPU support
808  */
809 #ifdef CONFIG_ACPI_HOTPLUG_CPU
810 static
811 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
812 {
813 #ifdef CONFIG_ACPI_NUMA
814 	int pxm_id;
815 	int nid;
816 
817 	pxm_id = acpi_get_pxm(handle);
818 	/*
819 	 * We don't have cpu-only-node hotadd. But if the system equips
820 	 * SRAT table, pxm is already found and node is ready.
821   	 * So, just pxm_to_nid(pxm) is OK.
822 	 * This code here is for the system which doesn't have full SRAT
823   	 * table for possible cpus.
824 	 */
825 	nid = acpi_map_pxm_to_node(pxm_id);
826 	node_cpuid[cpu].phys_id = physid;
827 	node_cpuid[cpu].nid = nid;
828 #endif
829 	return (0);
830 }
831 
832 int additional_cpus __initdata = -1;
833 
834 static __init int setup_additional_cpus(char *s)
835 {
836 	if (s)
837 		additional_cpus = simple_strtol(s, NULL, 0);
838 
839 	return 0;
840 }
841 
842 early_param("additional_cpus", setup_additional_cpus);
843 
844 /*
845  * cpu_possible_mask should be static, it cannot change as CPUs
846  * are onlined, or offlined. The reason is per-cpu data-structures
847  * are allocated by some modules at init time, and dont expect to
848  * do this dynamically on cpu arrival/departure.
849  * cpu_present_mask on the other hand can change dynamically.
850  * In case when cpu_hotplug is not compiled, then we resort to current
851  * behaviour, which is cpu_possible == cpu_present.
852  * - Ashok Raj
853  *
854  * Three ways to find out the number of additional hotplug CPUs:
855  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
856  * - The user can overwrite it with additional_cpus=NUM
857  * - Otherwise don't reserve additional CPUs.
858  */
859 __init void prefill_possible_map(void)
860 {
861 	int i;
862 	int possible, disabled_cpus;
863 
864 	disabled_cpus = total_cpus - available_cpus;
865 
866  	if (additional_cpus == -1) {
867  		if (disabled_cpus > 0)
868 			additional_cpus = disabled_cpus;
869  		else
870 			additional_cpus = 0;
871  	}
872 
873 	possible = available_cpus + additional_cpus;
874 
875 	if (possible > nr_cpu_ids)
876 		possible = nr_cpu_ids;
877 
878 	printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
879 		possible, max((possible - available_cpus), 0));
880 
881 	for (i = 0; i < possible; i++)
882 		set_cpu_possible(i, true);
883 }
884 
885 static int _acpi_map_lsapic(acpi_handle handle, int *pcpu)
886 {
887 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
888 	union acpi_object *obj;
889 	struct acpi_madt_local_sapic *lsapic;
890 	cpumask_t tmp_map;
891 	int cpu, physid;
892 
893 	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
894 		return -EINVAL;
895 
896 	if (!buffer.length || !buffer.pointer)
897 		return -EINVAL;
898 
899 	obj = buffer.pointer;
900 	if (obj->type != ACPI_TYPE_BUFFER)
901 	{
902 		kfree(buffer.pointer);
903 		return -EINVAL;
904 	}
905 
906 	lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
907 
908 	if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
909 	    (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
910 		kfree(buffer.pointer);
911 		return -EINVAL;
912 	}
913 
914 	physid = ((lsapic->id << 8) | (lsapic->eid));
915 
916 	kfree(buffer.pointer);
917 	buffer.length = ACPI_ALLOCATE_BUFFER;
918 	buffer.pointer = NULL;
919 
920 	cpumask_complement(&tmp_map, cpu_present_mask);
921 	cpu = cpumask_first(&tmp_map);
922 	if (cpu >= nr_cpu_ids)
923 		return -EINVAL;
924 
925 	acpi_map_cpu2node(handle, cpu, physid);
926 
927 	set_cpu_present(cpu, true);
928 	ia64_cpu_to_sapicid[cpu] = physid;
929 
930 	acpi_processor_set_pdc(handle);
931 
932 	*pcpu = cpu;
933 	return (0);
934 }
935 
936 /* wrapper to silence section mismatch warning */
937 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
938 {
939 	return _acpi_map_lsapic(handle, pcpu);
940 }
941 EXPORT_SYMBOL(acpi_map_lsapic);
942 
943 int acpi_unmap_lsapic(int cpu)
944 {
945 	ia64_cpu_to_sapicid[cpu] = -1;
946 	set_cpu_present(cpu, false);
947 
948 #ifdef CONFIG_ACPI_NUMA
949 	/* NUMA specific cleanup's */
950 #endif
951 
952 	return (0);
953 }
954 
955 EXPORT_SYMBOL(acpi_unmap_lsapic);
956 #endif				/* CONFIG_ACPI_HOTPLUG_CPU */
957 
958 #ifdef CONFIG_ACPI_NUMA
959 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
960 				    void *context, void **ret)
961 {
962 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
963 	union acpi_object *obj;
964 	struct acpi_madt_io_sapic *iosapic;
965 	unsigned int gsi_base;
966 	int pxm, node;
967 
968 	/* Only care about objects w/ a method that returns the MADT */
969 	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
970 		return AE_OK;
971 
972 	if (!buffer.length || !buffer.pointer)
973 		return AE_OK;
974 
975 	obj = buffer.pointer;
976 	if (obj->type != ACPI_TYPE_BUFFER ||
977 	    obj->buffer.length < sizeof(*iosapic)) {
978 		kfree(buffer.pointer);
979 		return AE_OK;
980 	}
981 
982 	iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
983 
984 	if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
985 		kfree(buffer.pointer);
986 		return AE_OK;
987 	}
988 
989 	gsi_base = iosapic->global_irq_base;
990 
991 	kfree(buffer.pointer);
992 
993 	/*
994 	 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
995 	 * us which node to associate this with.
996 	 */
997 	pxm = acpi_get_pxm(handle);
998 	if (pxm < 0)
999 		return AE_OK;
1000 
1001 	node = pxm_to_node(pxm);
1002 
1003 	if (node >= MAX_NUMNODES || !node_online(node) ||
1004 	    cpumask_empty(cpumask_of_node(node)))
1005 		return AE_OK;
1006 
1007 	/* We know a gsi to node mapping! */
1008 	map_iosapic_to_node(gsi_base, node);
1009 	return AE_OK;
1010 }
1011 
1012 static int __init
1013 acpi_map_iosapics (void)
1014 {
1015 	acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
1016 	return 0;
1017 }
1018 
1019 fs_initcall(acpi_map_iosapics);
1020 #endif				/* CONFIG_ACPI_NUMA */
1021 
1022 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
1023 {
1024 	int err;
1025 
1026 	if ((err = iosapic_init(phys_addr, gsi_base)))
1027 		return err;
1028 
1029 #ifdef CONFIG_ACPI_NUMA
1030 	acpi_map_iosapic(handle, 0, NULL, NULL);
1031 #endif				/* CONFIG_ACPI_NUMA */
1032 
1033 	return 0;
1034 }
1035 
1036 EXPORT_SYMBOL(acpi_register_ioapic);
1037 
1038 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
1039 {
1040 	return iosapic_remove(gsi_base);
1041 }
1042 
1043 EXPORT_SYMBOL(acpi_unregister_ioapic);
1044 
1045 /*
1046  * acpi_suspend_lowlevel() - save kernel state and suspend.
1047  *
1048  * TBD when when IA64 starts to support suspend...
1049  */
1050 int acpi_suspend_lowlevel(void) { return 0; }
1051