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   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 <asm/io.h>
  48 #include <asm/iosapic.h>
  49 #include <asm/machvec.h>
  50 #include <asm/page.h>
  51 #include <asm/system.h>
  52 #include <asm/numa.h>
  53 #include <asm/sal.h>
  54 #include <asm/cyclone.h>
  55
  56 #define BAD_MADT_ENTRY(entry, end) (                                        \
  57                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  58                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
  59
  60 #define PREFIX                  "ACPI: "
  61
  62 void (*pm_idle) (void);
  63 EXPORT_SYMBOL(pm_idle);
  64 void (*pm_power_off) (void);
  65 EXPORT_SYMBOL(pm_power_off);
  66
  67 unsigned int acpi_cpei_override;
  68 unsigned int acpi_cpei_phys_cpuid;
  69
  70 unsigned long acpi_wakeup_address = 0;
  71
  72 #ifdef CONFIG_IA64_GENERIC
  73 static unsigned long __init acpi_find_rsdp(void)
  74 {
  75         unsigned long rsdp_phys = 0;
  76
  77         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
  78                 rsdp_phys = efi.acpi20;
  79         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
  80                 printk(KERN_WARNING PREFIX
  81                        "v1.0/r0.71 tables no longer supported\n");
  82         return rsdp_phys;
  83 }
  84 #endif
  85
  86 const char __init *
  87 acpi_get_sysname(void)
  88 {
  89 #ifdef CONFIG_IA64_GENERIC
  90         unsigned long rsdp_phys;
  91         struct acpi_table_rsdp *rsdp;
  92         struct acpi_table_xsdt *xsdt;
  93         struct acpi_table_header *hdr;
  94
  95         rsdp_phys = acpi_find_rsdp();
  96         if (!rsdp_phys) {
  97                 printk(KERN_ERR
  98                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  99                 return "dig";
 100         }
 101
 102         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
 103         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
 104                 printk(KERN_ERR
 105                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
 106                 return "dig";
 107         }
 108
 109         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
 110         hdr = &xsdt->header;
 111         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
 112                 printk(KERN_ERR
 113                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 114                 return "dig";
 115         }
 116
 117         if (!strcmp(hdr->oem_id, "HP")) {
 118                 return "hpzx1";
 119         } else if (!strcmp(hdr->oem_id, "SGI")) {
 120                 if (!strcmp(hdr->oem_table_id + 4, "UV"))
 121                         return "uv";
 122                 else
 123                         return "sn2";
 124         }
 125
 126         return "dig";
 127 #else
 128 # if defined (CONFIG_IA64_HP_SIM)
 129         return "hpsim";
 130 # elif defined (CONFIG_IA64_HP_ZX1)
 131         return "hpzx1";
 132 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
 133         return "hpzx1_swiotlb";
 134 # elif defined (CONFIG_IA64_SGI_SN2)
 135         return "sn2";
 136 # elif defined (CONFIG_IA64_SGI_UV)
 137         return "uv";
 138 # elif defined (CONFIG_IA64_DIG)
 139         return "dig";
 140 # else
 141 #       error Unknown platform.  Fix acpi.c.
 142 # endif
 143 #endif
 144 }
 145
 146 #ifdef CONFIG_ACPI
 147
 148 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 149
 150 /* Array to record platform interrupt vectors for generic interrupt routing. */
 151 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 152         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 153 };
 154
 155 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 156
 157 /*
 158  * Interrupt routing API for device drivers.  Provides interrupt vector for
 159  * a generic platform event.  Currently only CPEI is implemented.
 160  */
 161 int acpi_request_vector(u32 int_type)
 162 {
 163         int vector = -1;
 164
 165         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 166                 /* corrected platform error interrupt */
 167                 vector = platform_intr_list[int_type];
 168         } else
 169                 printk(KERN_ERR
 170                        "acpi_request_vector(): invalid interrupt type\n");
 171         return vector;
 172 }
 173
 174 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
 175 {
 176         return __va(phys_addr);
 177 }
 178
 179 /* --------------------------------------------------------------------------
 180                             Boot-time Table Parsing
 181    -------------------------------------------------------------------------- */
 182
 183 static int total_cpus __initdata;
 184 static int available_cpus __initdata;
 185 struct acpi_table_madt *acpi_madt __initdata;
 186 static u8 has_8259;
 187
 188 static int __init
 189 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 190                           const unsigned long end)
 191 {
 192         struct acpi_madt_local_apic_override *lapic;
 193
 194         lapic = (struct acpi_madt_local_apic_override *)header;
 195
 196         if (BAD_MADT_ENTRY(lapic, end))
 197                 return -EINVAL;
 198
 199         if (lapic->address) {
 200                 iounmap(ipi_base_addr);
 201                 ipi_base_addr = ioremap(lapic->address, 0);
 202         }
 203         return 0;
 204 }
 205
 206 static int __init
 207 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
 208 {
 209         struct acpi_madt_local_sapic *lsapic;
 210
 211         lsapic = (struct acpi_madt_local_sapic *)header;
 212
 213         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 214
 215         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 216 #ifdef CONFIG_SMP
 217                 smp_boot_data.cpu_phys_id[available_cpus] =
 218                     (lsapic->id << 8) | lsapic->eid;
 219 #endif
 220                 ++available_cpus;
 221         }
 222
 223         total_cpus++;
 224         return 0;
 225 }
 226
 227 static int __init
 228 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 229 {
 230         struct acpi_madt_local_apic_nmi *lacpi_nmi;
 231
 232         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 233
 234         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 235                 return -EINVAL;
 236
 237         /* TBD: Support lapic_nmi entries */
 238         return 0;
 239 }
 240
 241 static int __init
 242 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
 243 {
 244         struct acpi_madt_io_sapic *iosapic;
 245
 246         iosapic = (struct acpi_madt_io_sapic *)header;
 247
 248         if (BAD_MADT_ENTRY(iosapic, end))
 249                 return -EINVAL;
 250
 251         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 252 }
 253
 254 static unsigned int __initdata acpi_madt_rev;
 255
 256 static int __init
 257 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
 258                         const unsigned long end)
 259 {
 260         struct acpi_madt_interrupt_source *plintsrc;
 261         int vector;
 262
 263         plintsrc = (struct acpi_madt_interrupt_source *)header;
 264
 265         if (BAD_MADT_ENTRY(plintsrc, end))
 266                 return -EINVAL;
 267
 268         /*
 269          * Get vector assignment for this interrupt, set attributes,
 270          * and program the IOSAPIC routing table.
 271          */
 272         vector = iosapic_register_platform_intr(plintsrc->type,
 273                                                 plintsrc->global_irq,
 274                                                 plintsrc->io_sapic_vector,
 275                                                 plintsrc->eid,
 276                                                 plintsrc->id,
 277                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 278                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 279                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 280                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 281                                                  ACPI_MADT_TRIGGER_EDGE) ?
 282                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
 283
 284         platform_intr_list[plintsrc->type] = vector;
 285         if (acpi_madt_rev > 1) {
 286                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 287         }
 288
 289         /*
 290          * Save the physical id, so we can check when its being removed
 291          */
 292         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 293
 294         return 0;
 295 }
 296
 297 #ifdef CONFIG_HOTPLUG_CPU
 298 unsigned int can_cpei_retarget(void)
 299 {
 300         extern int cpe_vector;
 301         extern unsigned int force_cpei_retarget;
 302
 303         /*
 304          * Only if CPEI is supported and the override flag
 305          * is present, otherwise return that its re-targettable
 306          * if we are in polling mode.
 307          */
 308         if (cpe_vector > 0) {
 309                 if (acpi_cpei_override || force_cpei_retarget)
 310                         return 1;
 311                 else
 312                         return 0;
 313         }
 314         return 1;
 315 }
 316
 317 unsigned int is_cpu_cpei_target(unsigned int cpu)
 318 {
 319         unsigned int logical_id;
 320
 321         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 322
 323         if (logical_id == cpu)
 324                 return 1;
 325         else
 326                 return 0;
 327 }
 328
 329 void set_cpei_target_cpu(unsigned int cpu)
 330 {
 331         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 332 }
 333 #endif
 334
 335 unsigned int get_cpei_target_cpu(void)
 336 {
 337         return acpi_cpei_phys_cpuid;
 338 }
 339
 340 static int __init
 341 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 342                        const unsigned long end)
 343 {
 344         struct acpi_madt_interrupt_override *p;
 345
 346         p = (struct acpi_madt_interrupt_override *)header;
 347
 348         if (BAD_MADT_ENTRY(p, end))
 349                 return -EINVAL;
 350
 351         iosapic_override_isa_irq(p->source_irq, p->global_irq,
 352                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 353                                   ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 354                                  IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 355                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 356                                  ACPI_MADT_TRIGGER_EDGE) ?
 357                                  IOSAPIC_EDGE : IOSAPIC_LEVEL);
 358         return 0;
 359 }
 360
 361 static int __init
 362 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 363 {
 364         struct acpi_madt_nmi_source *nmi_src;
 365
 366         nmi_src = (struct acpi_madt_nmi_source *)header;
 367
 368         if (BAD_MADT_ENTRY(nmi_src, end))
 369                 return -EINVAL;
 370
 371         /* TBD: Support nimsrc entries */
 372         return 0;
 373 }
 374
 375 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 376 {
 377         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 378
 379                 /*
 380                  * Unfortunately ITC_DRIFT is not yet part of the
 381                  * official SAL spec, so the ITC_DRIFT bit is not
 382                  * set by the BIOS on this hardware.
 383                  */
 384                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 385
 386                 cyclone_setup();
 387         }
 388 }
 389
 390 static int __init acpi_parse_madt(struct acpi_table_header *table)
 391 {
 392         if (!table)
 393                 return -EINVAL;
 394
 395         acpi_madt = (struct acpi_table_madt *)table;
 396
 397         acpi_madt_rev = acpi_madt->header.revision;
 398
 399         /* remember the value for reference after free_initmem() */
 400 #ifdef CONFIG_ITANIUM
 401         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 402 #else
 403         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 404 #endif
 405         iosapic_system_init(has_8259);
 406
 407         /* Get base address of IPI Message Block */
 408
 409         if (acpi_madt->address)
 410                 ipi_base_addr = ioremap(acpi_madt->address, 0);
 411
 412         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 413
 414         acpi_madt_oem_check(acpi_madt->header.oem_id,
 415                             acpi_madt->header.oem_table_id);
 416
 417         return 0;
 418 }
 419
 420 #ifdef CONFIG_ACPI_NUMA
 421
 422 #undef SLIT_DEBUG
 423
 424 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 425
 426 static int __initdata srat_num_cpus;    /* number of cpus */
 427 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
 428 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 429 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 430 static struct acpi_table_slit __initdata *slit_table;
 431 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
 432
 433 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 434 {
 435         int pxm;
 436
 437         pxm = pa->proximity_domain_lo;
 438         if (ia64_platform_is("sn2"))
 439                 pxm += pa->proximity_domain_hi[0] << 8;
 440         return pxm;
 441 }
 442
 443 static int 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"))
 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                 memset(numa_slit, 10, sizeof(numa_slit));
 469                 return;
 470         }
 471         slit_table = slit;
 472 }
 473
 474 void __init
 475 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 476 {
 477         int pxm;
 478
 479         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 480                 return;
 481
 482         pxm = get_processor_proximity_domain(pa);
 483
 484         /* record this node in proximity bitmap */
 485         pxm_bit_set(pxm);
 486
 487         node_cpuid[srat_num_cpus].phys_id =
 488             (pa->apic_id << 8) | (pa->local_sapic_eid);
 489         /* nid should be overridden as logical node id later */
 490         node_cpuid[srat_num_cpus].nid = pxm;
 491         cpu_set(srat_num_cpus, early_cpu_possible_map);
 492         srat_num_cpus++;
 493 }
 494
 495 void __init
 496 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 497 {
 498         unsigned long paddr, size;
 499         int pxm;
 500         struct node_memblk_s *p, *q, *pend;
 501
 502         pxm = get_memory_proximity_domain(ma);
 503
 504         /* fill node memory chunk structure */
 505         paddr = ma->base_address;
 506         size = ma->length;
 507
 508         /* Ignore disabled entries */
 509         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 510                 return;
 511
 512         /* record this node in proximity bitmap */
 513         pxm_bit_set(pxm);
 514
 515         /* Insertion sort based on base address */
 516         pend = &node_memblk[num_node_memblks];
 517         for (p = &node_memblk[0]; p < pend; p++) {
 518                 if (paddr < p->start_paddr)
 519                         break;
 520         }
 521         if (p < pend) {
 522                 for (q = pend - 1; q >= p; q--)
 523                         *(q + 1) = *q;
 524         }
 525         p->start_paddr = paddr;
 526         p->size = size;
 527         p->nid = pxm;
 528         num_node_memblks++;
 529 }
 530
 531 void __init acpi_numa_arch_fixup(void)
 532 {
 533         int i, j, node_from, node_to;
 534
 535         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 536         if (srat_num_cpus == 0) {
 537                 node_set_online(0);
 538                 node_cpuid[0].phys_id = hard_smp_processor_id();
 539                 return;
 540         }
 541
 542         /*
 543          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 544          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 545          */
 546         nodes_clear(node_online_map);
 547         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 548                 if (pxm_bit_test(i)) {
 549                         int nid = acpi_map_pxm_to_node(i);
 550                         node_set_online(nid);
 551                 }
 552         }
 553
 554         /* set logical node id in memory chunk structure */
 555         for (i = 0; i < num_node_memblks; i++)
 556                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 557
 558         /* assign memory bank numbers for each chunk on each node */
 559         for_each_online_node(i) {
 560                 int bank;
 561
 562                 bank = 0;
 563                 for (j = 0; j < num_node_memblks; j++)
 564                         if (node_memblk[j].nid == i)
 565                                 node_memblk[j].bank = bank++;
 566         }
 567
 568         /* set logical node id in cpu structure */
 569         for_each_possible_early_cpu(i)
 570                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 571
 572         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 573                num_online_nodes());
 574         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 575                num_node_memblks);
 576
 577         if (!slit_table)
 578                 return;
 579         memset(numa_slit, -1, sizeof(numa_slit));
 580         for (i = 0; i < slit_table->locality_count; i++) {
 581                 if (!pxm_bit_test(i))
 582                         continue;
 583                 node_from = pxm_to_node(i);
 584                 for (j = 0; j < slit_table->locality_count; j++) {
 585                         if (!pxm_bit_test(j))
 586                                 continue;
 587                         node_to = pxm_to_node(j);
 588                         node_distance(node_from, node_to) =
 589                             slit_table->entry[i * slit_table->locality_count + j];
 590                 }
 591         }
 592
 593 #ifdef SLIT_DEBUG
 594         printk("ACPI 2.0 SLIT locality table:\n");
 595         for_each_online_node(i) {
 596                 for_each_online_node(j)
 597                     printk("%03d ", node_distance(i, j));
 598                 printk("\n");
 599         }
 600 #endif
 601 }
 602 #endif                          /* CONFIG_ACPI_NUMA */
 603
 604 /*
 605  * success: return IRQ number (>=0)
 606  * failure: return < 0
 607  */
 608 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 609 {
 610         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 611                 return gsi;
 612
 613         if (has_8259 && gsi < 16)
 614                 return isa_irq_to_vector(gsi);
 615
 616         return iosapic_register_intr(gsi,
 617                                      (polarity ==
 618                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 619                                      IOSAPIC_POL_LOW,
 620                                      (triggering ==
 621                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 622                                      IOSAPIC_LEVEL);
 623 }
 624
 625 void acpi_unregister_gsi(u32 gsi)
 626 {
 627         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 628                 return;
 629
 630         if (has_8259 && gsi < 16)
 631                 return;
 632
 633         iosapic_unregister_intr(gsi);
 634 }
 635
 636 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 637 {
 638         struct acpi_table_header *fadt_header;
 639         struct acpi_table_fadt *fadt;
 640
 641         if (!table)
 642                 return -EINVAL;
 643
 644         fadt_header = (struct acpi_table_header *)table;
 645         if (fadt_header->revision != 3)
 646                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 647
 648         fadt = (struct acpi_table_fadt *)fadt_header;
 649
 650         acpi_register_gsi(fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
 651         return 0;
 652 }
 653
 654 int __init acpi_boot_init(void)
 655 {
 656
 657         /*
 658          * MADT
 659          * ----
 660          * Parse the Multiple APIC Description Table (MADT), if exists.
 661          * Note that this table provides platform SMP configuration
 662          * information -- the successor to MPS tables.
 663          */
 664
 665         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 666                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 667                 goto skip_madt;
 668         }
 669
 670         /* Local APIC */
 671
 672         if (acpi_table_parse_madt
 673             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
 674                 printk(KERN_ERR PREFIX
 675                        "Error parsing LAPIC address override entry\n");
 676
 677         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_lsapic, NR_CPUS)
 678             < 1)
 679                 printk(KERN_ERR PREFIX
 680                        "Error parsing MADT - no LAPIC entries\n");
 681
 682         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
 683             < 0)
 684                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 685
 686         /* I/O APIC */
 687
 688         if (acpi_table_parse_madt
 689             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
 690                 if (!ia64_platform_is("sn2"))
 691                         printk(KERN_ERR PREFIX
 692                                "Error parsing MADT - no IOSAPIC entries\n");
 693         }
 694
 695         /* System-Level Interrupt Routing */
 696
 697         if (acpi_table_parse_madt
 698             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
 699              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 700                 printk(KERN_ERR PREFIX
 701                        "Error parsing platform interrupt source entry\n");
 702
 703         if (acpi_table_parse_madt
 704             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
 705                 printk(KERN_ERR PREFIX
 706                        "Error parsing interrupt source overrides entry\n");
 707
 708         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
 709                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 710       skip_madt:
 711
 712         /*
 713          * FADT says whether a legacy keyboard controller is present.
 714          * The FADT also contains an SCI_INT line, by which the system
 715          * gets interrupts such as power and sleep buttons.  If it's not
 716          * on a Legacy interrupt, it needs to be setup.
 717          */
 718         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
 719                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 720
 721 #ifdef CONFIG_SMP
 722         if (available_cpus == 0) {
 723                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 724                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 725                 smp_boot_data.cpu_phys_id[available_cpus] =
 726                     hard_smp_processor_id();
 727                 available_cpus = 1;     /* We've got at least one of these, no? */
 728         }
 729         smp_boot_data.cpu_count = available_cpus;
 730
 731         smp_build_cpu_map();
 732 # ifdef CONFIG_ACPI_NUMA
 733         if (srat_num_cpus == 0) {
 734                 int cpu, i = 1;
 735                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 736                         if (smp_boot_data.cpu_phys_id[cpu] !=
 737                             hard_smp_processor_id())
 738                                 node_cpuid[i++].phys_id =
 739                                     smp_boot_data.cpu_phys_id[cpu];
 740         }
 741 # endif
 742 #endif
 743 #ifdef CONFIG_ACPI_NUMA
 744         build_cpu_to_node_map();
 745 #endif
 746         /* Make boot-up look pretty */
 747         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 748                total_cpus);
 749         return 0;
 750 }
 751
 752 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 753 {
 754         int tmp;
 755
 756         if (has_8259 && gsi < 16)
 757                 *irq = isa_irq_to_vector(gsi);
 758         else {
 759                 tmp = gsi_to_irq(gsi);
 760                 if (tmp == -1)
 761                         return -1;
 762                 *irq = tmp;
 763         }
 764         return 0;
 765 }
 766
 767 /*
 768  *  ACPI based hotplug CPU support
 769  */
 770 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 771 static
 772 int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
 773 {
 774 #ifdef CONFIG_ACPI_NUMA
 775         int pxm_id;
 776         int nid;
 777
 778         pxm_id = acpi_get_pxm(handle);
 779         /*
 780          * We don't have cpu-only-node hotadd. But if the system equips
 781          * SRAT table, pxm is already found and node is ready.
 782          * So, just pxm_to_nid(pxm) is OK.
 783          * This code here is for the system which doesn't have full SRAT
 784          * table for possible cpus.
 785          */
 786         nid = acpi_map_pxm_to_node(pxm_id);
 787         node_cpuid[cpu].phys_id = physid;
 788         node_cpuid[cpu].nid = nid;
 789 #endif
 790         return (0);
 791 }
 792
 793 int additional_cpus __initdata = -1;
 794
 795 static __init int setup_additional_cpus(char *s)
 796 {
 797         if (s)
 798                 additional_cpus = simple_strtol(s, NULL, 0);
 799
 800         return 0;
 801 }
 802
 803 early_param("additional_cpus", setup_additional_cpus);
 804
 805 /*
 806  * cpu_possible_map should be static, it cannot change as CPUs
 807  * are onlined, or offlined. The reason is per-cpu data-structures
 808  * are allocated by some modules at init time, and dont expect to
 809  * do this dynamically on cpu arrival/departure.
 810  * cpu_present_map on the other hand can change dynamically.
 811  * In case when cpu_hotplug is not compiled, then we resort to current
 812  * behaviour, which is cpu_possible == cpu_present.
 813  * - Ashok Raj
 814  *
 815  * Three ways to find out the number of additional hotplug CPUs:
 816  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 817  * - The user can overwrite it with additional_cpus=NUM
 818  * - Otherwise don't reserve additional CPUs.
 819  */
 820 __init void prefill_possible_map(void)
 821 {
 822         int i;
 823         int possible, disabled_cpus;
 824
 825         disabled_cpus = total_cpus - available_cpus;
 826
 827         if (additional_cpus == -1) {
 828                 if (disabled_cpus > 0)
 829                         additional_cpus = disabled_cpus;
 830                 else
 831                         additional_cpus = 0;
 832         }
 833
 834         possible = available_cpus + additional_cpus;
 835
 836         if (possible > NR_CPUS)
 837                 possible = NR_CPUS;
 838
 839         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 840                 possible, max((possible - available_cpus), 0));
 841
 842         for (i = 0; i < possible; i++)
 843                 cpu_set(i, cpu_possible_map);
 844 }
 845
 846 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 847 {
 848         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 849         union acpi_object *obj;
 850         struct acpi_madt_local_sapic *lsapic;
 851         cpumask_t tmp_map;
 852         long physid;
 853         int cpu;
 854
 855         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 856                 return -EINVAL;
 857
 858         if (!buffer.length || !buffer.pointer)
 859                 return -EINVAL;
 860
 861         obj = buffer.pointer;
 862         if (obj->type != ACPI_TYPE_BUFFER)
 863         {
 864                 kfree(buffer.pointer);
 865                 return -EINVAL;
 866         }
 867
 868         lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
 869
 870         if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
 871             (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
 872                 kfree(buffer.pointer);
 873                 return -EINVAL;
 874         }
 875
 876         physid = ((lsapic->id << 8) | (lsapic->eid));
 877
 878         kfree(buffer.pointer);
 879         buffer.length = ACPI_ALLOCATE_BUFFER;
 880         buffer.pointer = NULL;
 881
 882         cpus_complement(tmp_map, cpu_present_map);
 883         cpu = first_cpu(tmp_map);
 884         if (cpu >= NR_CPUS)
 885                 return -EINVAL;
 886
 887         acpi_map_cpu2node(handle, cpu, physid);
 888
 889         cpu_set(cpu, cpu_present_map);
 890         ia64_cpu_to_sapicid[cpu] = physid;
 891
 892         *pcpu = cpu;
 893         return (0);
 894 }
 895
 896 EXPORT_SYMBOL(acpi_map_lsapic);
 897
 898 int acpi_unmap_lsapic(int cpu)
 899 {
 900         ia64_cpu_to_sapicid[cpu] = -1;
 901         cpu_clear(cpu, cpu_present_map);
 902
 903 #ifdef CONFIG_ACPI_NUMA
 904         /* NUMA specific cleanup's */
 905 #endif
 906
 907         return (0);
 908 }
 909
 910 EXPORT_SYMBOL(acpi_unmap_lsapic);
 911 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 912
 913 #ifdef CONFIG_ACPI_NUMA
 914 static acpi_status __devinit
 915 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
 916 {
 917         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 918         union acpi_object *obj;
 919         struct acpi_madt_io_sapic *iosapic;
 920         unsigned int gsi_base;
 921         int pxm, node;
 922
 923         /* Only care about objects w/ a method that returns the MADT */
 924         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 925                 return AE_OK;
 926
 927         if (!buffer.length || !buffer.pointer)
 928                 return AE_OK;
 929
 930         obj = buffer.pointer;
 931         if (obj->type != ACPI_TYPE_BUFFER ||
 932             obj->buffer.length < sizeof(*iosapic)) {
 933                 kfree(buffer.pointer);
 934                 return AE_OK;
 935         }
 936
 937         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 938
 939         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 940                 kfree(buffer.pointer);
 941                 return AE_OK;
 942         }
 943
 944         gsi_base = iosapic->global_irq_base;
 945
 946         kfree(buffer.pointer);
 947
 948         /*
 949          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
 950          * us which node to associate this with.
 951          */
 952         pxm = acpi_get_pxm(handle);
 953         if (pxm < 0)
 954                 return AE_OK;
 955
 956         node = pxm_to_node(pxm);
 957
 958         if (node >= MAX_NUMNODES || !node_online(node) ||
 959             cpus_empty(node_to_cpumask(node)))
 960                 return AE_OK;
 961
 962         /* We know a gsi to node mapping! */
 963         map_iosapic_to_node(gsi_base, node);
 964         return AE_OK;
 965 }
 966
 967 static int __init
 968 acpi_map_iosapics (void)
 969 {
 970         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
 971         return 0;
 972 }
 973
 974 fs_initcall(acpi_map_iosapics);
 975 #endif                          /* CONFIG_ACPI_NUMA */
 976
 977 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 978 {
 979         int err;
 980
 981         if ((err = iosapic_init(phys_addr, gsi_base)))
 982                 return err;
 983
 984 #ifdef CONFIG_ACPI_NUMA
 985         acpi_map_iosapic(handle, 0, NULL, NULL);
 986 #endif                          /* CONFIG_ACPI_NUMA */
 987
 988         return 0;
 989 }
 990
 991 EXPORT_SYMBOL(acpi_register_ioapic);
 992
 993 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 994 {
 995         return iosapic_remove(gsi_base);
 996 }
 997
 998 EXPORT_SYMBOL(acpi_unregister_ioapic);
 999
1000 /*
1001  * acpi_save_state_mem() - save kernel state
1002  *
1003  * TBD when when IA64 starts to support suspend...
1004  */
1005 int acpi_save_state_mem(void) { return 0; }
1006
1007 /*
1008  * acpi_restore_state()
1009  */
1010 void acpi_restore_state_mem(void) {}
1011
1012 /*
1013  * do_suspend_lowlevel()
1014  */
1015 void do_suspend_lowlevel(void) {}
1016
1017 #endif                          /* CONFIG_ACPI */