arch/ia64/kernel/acpi.c

   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                 ((acpi_table_entry_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 char acpi_kbd_controller_present = 1;
  68 unsigned char acpi_legacy_devices;
  69
  70 unsigned int acpi_cpei_override;
  71 unsigned int acpi_cpei_phys_cpuid;
  72
  73 #define MAX_SAPICS 256
  74 u16 ia64_acpiid_to_sapicid[MAX_SAPICS] = {[0 ... MAX_SAPICS - 1] = -1 };
  75
  76 EXPORT_SYMBOL(ia64_acpiid_to_sapicid);
  77
  78 const char *acpi_get_sysname(void)
  79 {
  80 #ifdef CONFIG_IA64_GENERIC
  81         unsigned long rsdp_phys;
  82         struct acpi20_table_rsdp *rsdp;
  83         struct acpi_table_xsdt *xsdt;
  84         struct acpi_table_header *hdr;
  85
  86         rsdp_phys = acpi_find_rsdp();
  87         if (!rsdp_phys) {
  88                 printk(KERN_ERR
  89                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  90                 return "dig";
  91         }
  92
  93         rsdp = (struct acpi20_table_rsdp *)__va(rsdp_phys);
  94         if (strncmp(rsdp->signature, RSDP_SIG, sizeof(RSDP_SIG) - 1)) {
  95                 printk(KERN_ERR
  96                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
  97                 return "dig";
  98         }
  99
 100         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_address);
 101         hdr = &xsdt->header;
 102         if (strncmp(hdr->signature, XSDT_SIG, sizeof(XSDT_SIG) - 1)) {
 103                 printk(KERN_ERR
 104                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 105                 return "dig";
 106         }
 107
 108         if (!strcmp(hdr->oem_id, "HP")) {
 109                 return "hpzx1";
 110         } else if (!strcmp(hdr->oem_id, "SGI")) {
 111                 return "sn2";
 112         }
 113
 114         return "dig";
 115 #else
 116 # if defined (CONFIG_IA64_HP_SIM)
 117         return "hpsim";
 118 # elif defined (CONFIG_IA64_HP_ZX1)
 119         return "hpzx1";
 120 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
 121         return "hpzx1_swiotlb";
 122 # elif defined (CONFIG_IA64_SGI_SN2)
 123         return "sn2";
 124 # elif defined (CONFIG_IA64_DIG)
 125         return "dig";
 126 # else
 127 #       error Unknown platform.  Fix acpi.c.
 128 # endif
 129 #endif
 130 }
 131
 132 #ifdef CONFIG_ACPI
 133
 134 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 135
 136 /* Array to record platform interrupt vectors for generic interrupt routing. */
 137 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 138         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 139 };
 140
 141 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 142
 143 /*
 144  * Interrupt routing API for device drivers.  Provides interrupt vector for
 145  * a generic platform event.  Currently only CPEI is implemented.
 146  */
 147 int acpi_request_vector(u32 int_type)
 148 {
 149         int vector = -1;
 150
 151         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 152                 /* corrected platform error interrupt */
 153                 vector = platform_intr_list[int_type];
 154         } else
 155                 printk(KERN_ERR
 156                        "acpi_request_vector(): invalid interrupt type\n");
 157         return vector;
 158 }
 159
 160 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 161 {
 162         return __va(phys_addr);
 163 }
 164
 165 /* --------------------------------------------------------------------------
 166                             Boot-time Table Parsing
 167    -------------------------------------------------------------------------- */
 168
 169 static int total_cpus __initdata;
 170 static int available_cpus __initdata;
 171 struct acpi_table_madt *acpi_madt __initdata;
 172 static u8 has_8259;
 173
 174 static int __init
 175 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
 176                           const unsigned long end)
 177 {
 178         struct acpi_table_lapic_addr_ovr *lapic;
 179
 180         lapic = (struct acpi_table_lapic_addr_ovr *)header;
 181
 182         if (BAD_MADT_ENTRY(lapic, end))
 183                 return -EINVAL;
 184
 185         if (lapic->address) {
 186                 iounmap(ipi_base_addr);
 187                 ipi_base_addr = ioremap(lapic->address, 0);
 188         }
 189         return 0;
 190 }
 191
 192 static int __init
 193 acpi_parse_lsapic(acpi_table_entry_header * header, const unsigned long end)
 194 {
 195         struct acpi_table_lsapic *lsapic;
 196
 197         lsapic = (struct acpi_table_lsapic *)header;
 198
 199         if (BAD_MADT_ENTRY(lsapic, end))
 200                 return -EINVAL;
 201
 202         if (lsapic->flags.enabled) {
 203 #ifdef CONFIG_SMP
 204                 smp_boot_data.cpu_phys_id[available_cpus] =
 205                     (lsapic->id << 8) | lsapic->eid;
 206 #endif
 207                 ia64_acpiid_to_sapicid[lsapic->acpi_id] =
 208                     (lsapic->id << 8) | lsapic->eid;
 209                 ++available_cpus;
 210         }
 211
 212         total_cpus++;
 213         return 0;
 214 }
 215
 216 static int __init
 217 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
 218 {
 219         struct acpi_table_lapic_nmi *lacpi_nmi;
 220
 221         lacpi_nmi = (struct acpi_table_lapic_nmi *)header;
 222
 223         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 224                 return -EINVAL;
 225
 226         /* TBD: Support lapic_nmi entries */
 227         return 0;
 228 }
 229
 230 static int __init
 231 acpi_parse_iosapic(acpi_table_entry_header * header, const unsigned long end)
 232 {
 233         struct acpi_table_iosapic *iosapic;
 234
 235         iosapic = (struct acpi_table_iosapic *)header;
 236
 237         if (BAD_MADT_ENTRY(iosapic, end))
 238                 return -EINVAL;
 239
 240         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 241 }
 242
 243 static unsigned int __initdata acpi_madt_rev;
 244
 245 static int __init
 246 acpi_parse_plat_int_src(acpi_table_entry_header * header,
 247                         const unsigned long end)
 248 {
 249         struct acpi_table_plat_int_src *plintsrc;
 250         int vector;
 251
 252         plintsrc = (struct acpi_table_plat_int_src *)header;
 253
 254         if (BAD_MADT_ENTRY(plintsrc, end))
 255                 return -EINVAL;
 256
 257         /*
 258          * Get vector assignment for this interrupt, set attributes,
 259          * and program the IOSAPIC routing table.
 260          */
 261         vector = iosapic_register_platform_intr(plintsrc->type,
 262                                                 plintsrc->global_irq,
 263                                                 plintsrc->iosapic_vector,
 264                                                 plintsrc->eid,
 265                                                 plintsrc->id,
 266                                                 (plintsrc->flags.polarity ==
 267                                                  1) ? IOSAPIC_POL_HIGH :
 268                                                 IOSAPIC_POL_LOW,
 269                                                 (plintsrc->flags.trigger ==
 270                                                  1) ? IOSAPIC_EDGE :
 271                                                 IOSAPIC_LEVEL);
 272
 273         platform_intr_list[plintsrc->type] = vector;
 274         if (acpi_madt_rev > 1) {
 275                 acpi_cpei_override = plintsrc->plint_flags.cpei_override_flag;
 276         }
 277
 278         /*
 279          * Save the physical id, so we can check when its being removed
 280          */
 281         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 282
 283         return 0;
 284 }
 285
 286 #ifdef CONFIG_HOTPLUG_CPU
 287 unsigned int can_cpei_retarget(void)
 288 {
 289         extern int cpe_vector;
 290         extern unsigned int force_cpei_retarget;
 291
 292         /*
 293          * Only if CPEI is supported and the override flag
 294          * is present, otherwise return that its re-targettable
 295          * if we are in polling mode.
 296          */
 297         if (cpe_vector > 0) {
 298                 if (acpi_cpei_override || force_cpei_retarget)
 299                         return 1;
 300                 else
 301                         return 0;
 302         }
 303         return 1;
 304 }
 305
 306 unsigned int is_cpu_cpei_target(unsigned int cpu)
 307 {
 308         unsigned int logical_id;
 309
 310         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 311
 312         if (logical_id == cpu)
 313                 return 1;
 314         else
 315                 return 0;
 316 }
 317
 318 void set_cpei_target_cpu(unsigned int cpu)
 319 {
 320         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 321 }
 322 #endif
 323
 324 unsigned int get_cpei_target_cpu(void)
 325 {
 326         return acpi_cpei_phys_cpuid;
 327 }
 328
 329 static int __init
 330 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
 331                        const unsigned long end)
 332 {
 333         struct acpi_table_int_src_ovr *p;
 334
 335         p = (struct acpi_table_int_src_ovr *)header;
 336
 337         if (BAD_MADT_ENTRY(p, end))
 338                 return -EINVAL;
 339
 340         iosapic_override_isa_irq(p->bus_irq, p->global_irq,
 341                                  (p->flags.polarity ==
 342                                   1) ? IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 343                                  (p->flags.trigger ==
 344                                   1) ? IOSAPIC_EDGE : IOSAPIC_LEVEL);
 345         return 0;
 346 }
 347
 348 static int __init
 349 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
 350 {
 351         struct acpi_table_nmi_src *nmi_src;
 352
 353         nmi_src = (struct acpi_table_nmi_src *)header;
 354
 355         if (BAD_MADT_ENTRY(nmi_src, end))
 356                 return -EINVAL;
 357
 358         /* TBD: Support nimsrc entries */
 359         return 0;
 360 }
 361
 362 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 363 {
 364         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 365
 366                 /*
 367                  * Unfortunately ITC_DRIFT is not yet part of the
 368                  * official SAL spec, so the ITC_DRIFT bit is not
 369                  * set by the BIOS on this hardware.
 370                  */
 371                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 372
 373                 cyclone_setup();
 374         }
 375 }
 376
 377 static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
 378 {
 379         if (!phys_addr || !size)
 380                 return -EINVAL;
 381
 382         acpi_madt = (struct acpi_table_madt *)__va(phys_addr);
 383
 384         acpi_madt_rev = acpi_madt->header.revision;
 385
 386         /* remember the value for reference after free_initmem() */
 387 #ifdef CONFIG_ITANIUM
 388         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 389 #else
 390         has_8259 = acpi_madt->flags.pcat_compat;
 391 #endif
 392         iosapic_system_init(has_8259);
 393
 394         /* Get base address of IPI Message Block */
 395
 396         if (acpi_madt->lapic_address)
 397                 ipi_base_addr = ioremap(acpi_madt->lapic_address, 0);
 398
 399         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 400
 401         acpi_madt_oem_check(acpi_madt->header.oem_id,
 402                             acpi_madt->header.oem_table_id);
 403
 404         return 0;
 405 }
 406
 407 #ifdef CONFIG_ACPI_NUMA
 408
 409 #undef SLIT_DEBUG
 410
 411 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 412
 413 static int __initdata srat_num_cpus;    /* number of cpus */
 414 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
 415 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 416 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 417 static struct acpi_table_slit __initdata *slit_table;
 418
 419 static int get_processor_proximity_domain(struct acpi_table_processor_affinity *pa)
 420 {
 421         int pxm;
 422
 423         pxm = pa->proximity_domain;
 424         if (ia64_platform_is("sn2"))
 425                 pxm += pa->reserved[0] << 8;
 426         return pxm;
 427 }
 428
 429 static int get_memory_proximity_domain(struct acpi_table_memory_affinity *ma)
 430 {
 431         int pxm;
 432
 433         pxm = ma->proximity_domain;
 434         if (ia64_platform_is("sn2"))
 435                 pxm += ma->reserved1[0] << 8;
 436         return pxm;
 437 }
 438
 439 /*
 440  * ACPI 2.0 SLIT (System Locality Information Table)
 441  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 442  */
 443 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 444 {
 445         u32 len;
 446
 447         len = sizeof(struct acpi_table_header) + 8
 448             + slit->localities * slit->localities;
 449         if (slit->header.length != len) {
 450                 printk(KERN_ERR
 451                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 452                        len, slit->header.length);
 453                 memset(numa_slit, 10, sizeof(numa_slit));
 454                 return;
 455         }
 456         slit_table = slit;
 457 }
 458
 459 void __init
 460 acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity *pa)
 461 {
 462         int pxm;
 463
 464         if (!pa->flags.enabled)
 465                 return;
 466
 467         pxm = get_processor_proximity_domain(pa);
 468
 469         /* record this node in proximity bitmap */
 470         pxm_bit_set(pxm);
 471
 472         node_cpuid[srat_num_cpus].phys_id =
 473             (pa->apic_id << 8) | (pa->lsapic_eid);
 474         /* nid should be overridden as logical node id later */
 475         node_cpuid[srat_num_cpus].nid = pxm;
 476         srat_num_cpus++;
 477 }
 478
 479 void __init
 480 acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
 481 {
 482         unsigned long paddr, size;
 483         int pxm;
 484         struct node_memblk_s *p, *q, *pend;
 485
 486         pxm = get_memory_proximity_domain(ma);
 487
 488         /* fill node memory chunk structure */
 489         paddr = ma->base_addr_hi;
 490         paddr = (paddr << 32) | ma->base_addr_lo;
 491         size = ma->length_hi;
 492         size = (size << 32) | ma->length_lo;
 493
 494         /* Ignore disabled entries */
 495         if (!ma->flags.enabled)
 496                 return;
 497
 498         /* record this node in proximity bitmap */
 499         pxm_bit_set(pxm);
 500
 501         /* Insertion sort based on base address */
 502         pend = &node_memblk[num_node_memblks];
 503         for (p = &node_memblk[0]; p < pend; p++) {
 504                 if (paddr < p->start_paddr)
 505                         break;
 506         }
 507         if (p < pend) {
 508                 for (q = pend - 1; q >= p; q--)
 509                         *(q + 1) = *q;
 510         }
 511         p->start_paddr = paddr;
 512         p->size = size;
 513         p->nid = pxm;
 514         num_node_memblks++;
 515 }
 516
 517 void __init acpi_numa_arch_fixup(void)
 518 {
 519         int i, j, node_from, node_to;
 520
 521         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 522         if (srat_num_cpus == 0) {
 523                 node_set_online(0);
 524                 node_cpuid[0].phys_id = hard_smp_processor_id();
 525                 return;
 526         }
 527
 528         /*
 529          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 530          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 531          */
 532         nodes_clear(node_online_map);
 533         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 534                 if (pxm_bit_test(i)) {
 535                         int nid = acpi_map_pxm_to_node(i);
 536                         node_set_online(nid);
 537                 }
 538         }
 539
 540         /* set logical node id in memory chunk structure */
 541         for (i = 0; i < num_node_memblks; i++)
 542                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 543
 544         /* assign memory bank numbers for each chunk on each node */
 545         for_each_online_node(i) {
 546                 int bank;
 547
 548                 bank = 0;
 549                 for (j = 0; j < num_node_memblks; j++)
 550                         if (node_memblk[j].nid == i)
 551                                 node_memblk[j].bank = bank++;
 552         }
 553
 554         /* set logical node id in cpu structure */
 555         for (i = 0; i < srat_num_cpus; i++)
 556                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 557
 558         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 559                num_online_nodes());
 560         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 561                num_node_memblks);
 562
 563         if (!slit_table)
 564                 return;
 565         memset(numa_slit, -1, sizeof(numa_slit));
 566         for (i = 0; i < slit_table->localities; i++) {
 567                 if (!pxm_bit_test(i))
 568                         continue;
 569                 node_from = pxm_to_node(i);
 570                 for (j = 0; j < slit_table->localities; j++) {
 571                         if (!pxm_bit_test(j))
 572                                 continue;
 573                         node_to = pxm_to_node(j);
 574                         node_distance(node_from, node_to) =
 575                             slit_table->entry[i * slit_table->localities + j];
 576                 }
 577         }
 578
 579 #ifdef SLIT_DEBUG
 580         printk("ACPI 2.0 SLIT locality table:\n");
 581         for_each_online_node(i) {
 582                 for_each_online_node(j)
 583                     printk("%03d ", node_distance(i, j));
 584                 printk("\n");
 585         }
 586 #endif
 587 }
 588 #endif                          /* CONFIG_ACPI_NUMA */
 589
 590 /*
 591  * success: return IRQ number (>=0)
 592  * failure: return < 0
 593  */
 594 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 595 {
 596         if (has_8259 && gsi < 16)
 597                 return isa_irq_to_vector(gsi);
 598
 599         return iosapic_register_intr(gsi,
 600                                      (polarity ==
 601                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 602                                      IOSAPIC_POL_LOW,
 603                                      (triggering ==
 604                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 605                                      IOSAPIC_LEVEL);
 606 }
 607
 608 EXPORT_SYMBOL(acpi_register_gsi);
 609
 610 void acpi_unregister_gsi(u32 gsi)
 611 {
 612         iosapic_unregister_intr(gsi);
 613 }
 614
 615 EXPORT_SYMBOL(acpi_unregister_gsi);
 616
 617 static int __init acpi_parse_fadt(unsigned long phys_addr, unsigned long size)
 618 {
 619         struct acpi_table_header *fadt_header;
 620         struct fadt_descriptor *fadt;
 621
 622         if (!phys_addr || !size)
 623                 return -EINVAL;
 624
 625         fadt_header = (struct acpi_table_header *)__va(phys_addr);
 626         if (fadt_header->revision != 3)
 627                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 628
 629         fadt = (struct fadt_descriptor *)fadt_header;
 630
 631         if (!(fadt->iapc_boot_arch & BAF_8042_KEYBOARD_CONTROLLER))
 632                 acpi_kbd_controller_present = 0;
 633
 634         if (fadt->iapc_boot_arch & BAF_LEGACY_DEVICES)
 635                 acpi_legacy_devices = 1;
 636
 637         acpi_register_gsi(fadt->sci_int, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
 638         return 0;
 639 }
 640
 641 unsigned long __init acpi_find_rsdp(void)
 642 {
 643         unsigned long rsdp_phys = 0;
 644
 645         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 646                 rsdp_phys = efi.acpi20;
 647         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 648                 printk(KERN_WARNING PREFIX
 649                        "v1.0/r0.71 tables no longer supported\n");
 650         return rsdp_phys;
 651 }
 652
 653 int __init acpi_boot_init(void)
 654 {
 655
 656         /*
 657          * MADT
 658          * ----
 659          * Parse the Multiple APIC Description Table (MADT), if exists.
 660          * Note that this table provides platform SMP configuration
 661          * information -- the successor to MPS tables.
 662          */
 663
 664         if (acpi_table_parse(ACPI_APIC, acpi_parse_madt) < 1) {
 665                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 666                 goto skip_madt;
 667         }
 668
 669         /* Local APIC */
 670
 671         if (acpi_table_parse_madt
 672             (ACPI_MADT_LAPIC_ADDR_OVR, acpi_parse_lapic_addr_ovr, 0) < 0)
 673                 printk(KERN_ERR PREFIX
 674                        "Error parsing LAPIC address override entry\n");
 675
 676         if (acpi_table_parse_madt(ACPI_MADT_LSAPIC, acpi_parse_lsapic, NR_CPUS)
 677             < 1)
 678                 printk(KERN_ERR PREFIX
 679                        "Error parsing MADT - no LAPIC entries\n");
 680
 681         if (acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0)
 682             < 0)
 683                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 684
 685         /* I/O APIC */
 686
 687         if (acpi_table_parse_madt
 688             (ACPI_MADT_IOSAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1)
 689                 printk(KERN_ERR PREFIX
 690                        "Error parsing MADT - no IOSAPIC entries\n");
 691
 692         /* System-Level Interrupt Routing */
 693
 694         if (acpi_table_parse_madt
 695             (ACPI_MADT_PLAT_INT_SRC, acpi_parse_plat_int_src,
 696              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 697                 printk(KERN_ERR PREFIX
 698                        "Error parsing platform interrupt source entry\n");
 699
 700         if (acpi_table_parse_madt
 701             (ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr, 0) < 0)
 702                 printk(KERN_ERR PREFIX
 703                        "Error parsing interrupt source overrides entry\n");
 704
 705         if (acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src, 0) < 0)
 706                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 707       skip_madt:
 708
 709         /*
 710          * FADT says whether a legacy keyboard controller is present.
 711          * The FADT also contains an SCI_INT line, by which the system
 712          * gets interrupts such as power and sleep buttons.  If it's not
 713          * on a Legacy interrupt, it needs to be setup.
 714          */
 715         if (acpi_table_parse(ACPI_FADT, acpi_parse_fadt) < 1)
 716                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 717
 718 #ifdef CONFIG_SMP
 719         if (available_cpus == 0) {
 720                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 721                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 722                 smp_boot_data.cpu_phys_id[available_cpus] =
 723                     hard_smp_processor_id();
 724                 available_cpus = 1;     /* We've got at least one of these, no? */
 725         }
 726         smp_boot_data.cpu_count = available_cpus;
 727
 728         smp_build_cpu_map();
 729 # ifdef CONFIG_ACPI_NUMA
 730         if (srat_num_cpus == 0) {
 731                 int cpu, i = 1;
 732                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 733                         if (smp_boot_data.cpu_phys_id[cpu] !=
 734                             hard_smp_processor_id())
 735                                 node_cpuid[i++].phys_id =
 736                                     smp_boot_data.cpu_phys_id[cpu];
 737         }
 738 # endif
 739 #endif
 740 #ifdef CONFIG_ACPI_NUMA
 741         build_cpu_to_node_map();
 742 #endif
 743         /* Make boot-up look pretty */
 744         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 745                total_cpus);
 746         return 0;
 747 }
 748
 749 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 750 {
 751         int vector;
 752
 753         if (has_8259 && gsi < 16)
 754                 *irq = isa_irq_to_vector(gsi);
 755         else {
 756                 vector = gsi_to_vector(gsi);
 757                 if (vector == -1)
 758                         return -1;
 759
 760                 *irq = vector;
 761         }
 762         return 0;
 763 }
 764
 765 /*
 766  *  ACPI based hotplug CPU support
 767  */
 768 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 769 static
 770 int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
 771 {
 772 #ifdef CONFIG_ACPI_NUMA
 773         int pxm_id;
 774
 775         pxm_id = acpi_get_pxm(handle);
 776
 777         /*
 778          * Assuming that the container driver would have set the proximity
 779          * domain and would have initialized pxm_to_node(pxm_id) && pxm_flag
 780          */
 781         node_cpuid[cpu].nid = (pxm_id < 0) ? 0 : pxm_to_node(pxm_id);
 782
 783         node_cpuid[cpu].phys_id = physid;
 784 #endif
 785         return (0);
 786 }
 787
 788 int additional_cpus __initdata = -1;
 789
 790 static __init int setup_additional_cpus(char *s)
 791 {
 792         if (s)
 793                 additional_cpus = simple_strtol(s, NULL, 0);
 794
 795         return 0;
 796 }
 797
 798 early_param("additional_cpus", setup_additional_cpus);
 799
 800 /*
 801  * cpu_possible_map should be static, it cannot change as cpu's
 802  * are onlined, or offlined. The reason is per-cpu data-structures
 803  * are allocated by some modules at init time, and dont expect to
 804  * do this dynamically on cpu arrival/departure.
 805  * cpu_present_map on the other hand can change dynamically.
 806  * In case when cpu_hotplug is not compiled, then we resort to current
 807  * behaviour, which is cpu_possible == cpu_present.
 808  * - Ashok Raj
 809  *
 810  * Three ways to find out the number of additional hotplug CPUs:
 811  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 812  * - The user can overwrite it with additional_cpus=NUM
 813  * - Otherwise don't reserve additional CPUs.
 814  */
 815 __init void prefill_possible_map(void)
 816 {
 817         int i;
 818         int possible, disabled_cpus;
 819
 820         disabled_cpus = total_cpus - available_cpus;
 821
 822         if (additional_cpus == -1) {
 823                 if (disabled_cpus > 0)
 824                         additional_cpus = disabled_cpus;
 825                 else
 826                         additional_cpus = 0;
 827         }
 828
 829         possible = available_cpus + additional_cpus;
 830
 831         if (possible > NR_CPUS)
 832                 possible = NR_CPUS;
 833
 834         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 835                 possible, max((possible - available_cpus), 0));
 836
 837         for (i = 0; i < possible; i++)
 838                 cpu_set(i, cpu_possible_map);
 839 }
 840
 841 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 842 {
 843         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 844         union acpi_object *obj;
 845         struct acpi_table_lsapic *lsapic;
 846         cpumask_t tmp_map;
 847         long physid;
 848         int cpu;
 849
 850         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 851                 return -EINVAL;
 852
 853         if (!buffer.length || !buffer.pointer)
 854                 return -EINVAL;
 855
 856         obj = buffer.pointer;
 857         if (obj->type != ACPI_TYPE_BUFFER ||
 858             obj->buffer.length < sizeof(*lsapic)) {
 859                 acpi_os_free(buffer.pointer);
 860                 return -EINVAL;
 861         }
 862
 863         lsapic = (struct acpi_table_lsapic *)obj->buffer.pointer;
 864
 865         if ((lsapic->header.type != ACPI_MADT_LSAPIC) ||
 866             (!lsapic->flags.enabled)) {
 867                 acpi_os_free(buffer.pointer);
 868                 return -EINVAL;
 869         }
 870
 871         physid = ((lsapic->id << 8) | (lsapic->eid));
 872
 873         acpi_os_free(buffer.pointer);
 874         buffer.length = ACPI_ALLOCATE_BUFFER;
 875         buffer.pointer = NULL;
 876
 877         cpus_complement(tmp_map, cpu_present_map);
 878         cpu = first_cpu(tmp_map);
 879         if (cpu >= NR_CPUS)
 880                 return -EINVAL;
 881
 882         acpi_map_cpu2node(handle, cpu, physid);
 883
 884         cpu_set(cpu, cpu_present_map);
 885         ia64_cpu_to_sapicid[cpu] = physid;
 886         ia64_acpiid_to_sapicid[lsapic->acpi_id] = ia64_cpu_to_sapicid[cpu];
 887
 888         *pcpu = cpu;
 889         return (0);
 890 }
 891
 892 EXPORT_SYMBOL(acpi_map_lsapic);
 893
 894 int acpi_unmap_lsapic(int cpu)
 895 {
 896         int i;
 897
 898         for (i = 0; i < MAX_SAPICS; i++) {
 899                 if (ia64_acpiid_to_sapicid[i] == ia64_cpu_to_sapicid[cpu]) {
 900                         ia64_acpiid_to_sapicid[i] = -1;
 901                         break;
 902                 }
 903         }
 904         ia64_cpu_to_sapicid[cpu] = -1;
 905         cpu_clear(cpu, cpu_present_map);
 906
 907 #ifdef CONFIG_ACPI_NUMA
 908         /* NUMA specific cleanup's */
 909 #endif
 910
 911         return (0);
 912 }
 913
 914 EXPORT_SYMBOL(acpi_unmap_lsapic);
 915 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 916
 917 #ifdef CONFIG_ACPI_NUMA
 918 static acpi_status __devinit
 919 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
 920 {
 921         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 922         union acpi_object *obj;
 923         struct acpi_table_iosapic *iosapic;
 924         unsigned int gsi_base;
 925         int pxm, node;
 926
 927         /* Only care about objects w/ a method that returns the MADT */
 928         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 929                 return AE_OK;
 930
 931         if (!buffer.length || !buffer.pointer)
 932                 return AE_OK;
 933
 934         obj = buffer.pointer;
 935         if (obj->type != ACPI_TYPE_BUFFER ||
 936             obj->buffer.length < sizeof(*iosapic)) {
 937                 acpi_os_free(buffer.pointer);
 938                 return AE_OK;
 939         }
 940
 941         iosapic = (struct acpi_table_iosapic *)obj->buffer.pointer;
 942
 943         if (iosapic->header.type != ACPI_MADT_IOSAPIC) {
 944                 acpi_os_free(buffer.pointer);
 945                 return AE_OK;
 946         }
 947
 948         gsi_base = iosapic->global_irq_base;
 949
 950         acpi_os_free(buffer.pointer);
 951
 952         /*
 953          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
 954          * us which node to associate this with.
 955          */
 956         pxm = acpi_get_pxm(handle);
 957         if (pxm < 0)
 958                 return AE_OK;
 959
 960         node = pxm_to_node(pxm);
 961
 962         if (node >= MAX_NUMNODES || !node_online(node) ||
 963             cpus_empty(node_to_cpumask(node)))
 964                 return AE_OK;
 965
 966         /* We know a gsi to node mapping! */
 967         map_iosapic_to_node(gsi_base, node);
 968         return AE_OK;
 969 }
 970
 971 static int __init
 972 acpi_map_iosapics (void)
 973 {
 974         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
 975         return 0;
 976 }
 977
 978 fs_initcall(acpi_map_iosapics);
 979 #endif                          /* CONFIG_ACPI_NUMA */
 980
 981 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 982 {
 983         int err;
 984
 985         if ((err = iosapic_init(phys_addr, gsi_base)))
 986                 return err;
 987
 988 #ifdef CONFIG_ACPI_NUMA
 989         acpi_map_iosapic(handle, 0, NULL, NULL);
 990 #endif                          /* CONFIG_ACPI_NUMA */
 991
 992         return 0;
 993 }
 994
 995 EXPORT_SYMBOL(acpi_register_ioapic);
 996
 997 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 998 {
 999         return iosapic_remove(gsi_base);
1000 }
1001
1002 EXPORT_SYMBOL(acpi_unregister_ioapic);
1003
1004 #endif                          /* CONFIG_ACPI */