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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 const char __init *
  73 acpi_get_sysname(void)
  74 {
  75 #ifdef CONFIG_IA64_GENERIC
  76         unsigned long rsdp_phys;
  77         struct acpi_table_rsdp *rsdp;
  78         struct acpi_table_xsdt *xsdt;
  79         struct acpi_table_header *hdr;
  80
  81         rsdp_phys = acpi_find_rsdp();
  82         if (!rsdp_phys) {
  83                 printk(KERN_ERR
  84                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  85                 return "dig";
  86         }
  87
  88         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
  89         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
  90                 printk(KERN_ERR
  91                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
  92                 return "dig";
  93         }
  94
  95         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
  96         hdr = &xsdt->header;
  97         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
  98                 printk(KERN_ERR
  99                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 100                 return "dig";
 101         }
 102
 103         if (!strcmp(hdr->oem_id, "HP")) {
 104                 return "hpzx1";
 105         } else if (!strcmp(hdr->oem_id, "SGI")) {
 106                 return "sn2";
 107         }
 108
 109         return "dig";
 110 #else
 111 # if defined (CONFIG_IA64_HP_SIM)
 112         return "hpsim";
 113 # elif defined (CONFIG_IA64_HP_ZX1)
 114         return "hpzx1";
 115 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
 116         return "hpzx1_swiotlb";
 117 # elif defined (CONFIG_IA64_SGI_SN2)
 118         return "sn2";
 119 # elif defined (CONFIG_IA64_DIG)
 120         return "dig";
 121 # else
 122 #       error Unknown platform.  Fix acpi.c.
 123 # endif
 124 #endif
 125 }
 126
 127 #ifdef CONFIG_ACPI
 128
 129 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 130
 131 /* Array to record platform interrupt vectors for generic interrupt routing. */
 132 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 133         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 134 };
 135
 136 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 137
 138 /*
 139  * Interrupt routing API for device drivers.  Provides interrupt vector for
 140  * a generic platform event.  Currently only CPEI is implemented.
 141  */
 142 int acpi_request_vector(u32 int_type)
 143 {
 144         int vector = -1;
 145
 146         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 147                 /* corrected platform error interrupt */
 148                 vector = platform_intr_list[int_type];
 149         } else
 150                 printk(KERN_ERR
 151                        "acpi_request_vector(): invalid interrupt type\n");
 152         return vector;
 153 }
 154
 155 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 156 {
 157         return __va(phys_addr);
 158 }
 159
 160 /* --------------------------------------------------------------------------
 161                             Boot-time Table Parsing
 162    -------------------------------------------------------------------------- */
 163
 164 static int total_cpus __initdata;
 165 static int available_cpus __initdata;
 166 struct acpi_table_madt *acpi_madt __initdata;
 167 static u8 has_8259;
 168
 169 static int __init
 170 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 171                           const unsigned long end)
 172 {
 173         struct acpi_madt_local_apic_override *lapic;
 174
 175         lapic = (struct acpi_madt_local_apic_override *)header;
 176
 177         if (BAD_MADT_ENTRY(lapic, end))
 178                 return -EINVAL;
 179
 180         if (lapic->address) {
 181                 iounmap(ipi_base_addr);
 182                 ipi_base_addr = ioremap(lapic->address, 0);
 183         }
 184         return 0;
 185 }
 186
 187 static int __init
 188 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
 189 {
 190         struct acpi_madt_local_sapic *lsapic;
 191
 192         lsapic = (struct acpi_madt_local_sapic *)header;
 193
 194         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 195
 196         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 197 #ifdef CONFIG_SMP
 198                 smp_boot_data.cpu_phys_id[available_cpus] =
 199                     (lsapic->id << 8) | lsapic->eid;
 200 #endif
 201                 ++available_cpus;
 202         }
 203
 204         total_cpus++;
 205         return 0;
 206 }
 207
 208 static int __init
 209 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 210 {
 211         struct acpi_madt_local_apic_nmi *lacpi_nmi;
 212
 213         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 214
 215         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 216                 return -EINVAL;
 217
 218         /* TBD: Support lapic_nmi entries */
 219         return 0;
 220 }
 221
 222 static int __init
 223 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
 224 {
 225         struct acpi_madt_io_sapic *iosapic;
 226
 227         iosapic = (struct acpi_madt_io_sapic *)header;
 228
 229         if (BAD_MADT_ENTRY(iosapic, end))
 230                 return -EINVAL;
 231
 232         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 233 }
 234
 235 static unsigned int __initdata acpi_madt_rev;
 236
 237 static int __init
 238 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
 239                         const unsigned long end)
 240 {
 241         struct acpi_madt_interrupt_source *plintsrc;
 242         int vector;
 243
 244         plintsrc = (struct acpi_madt_interrupt_source *)header;
 245
 246         if (BAD_MADT_ENTRY(plintsrc, end))
 247                 return -EINVAL;
 248
 249         /*
 250          * Get vector assignment for this interrupt, set attributes,
 251          * and program the IOSAPIC routing table.
 252          */
 253         vector = iosapic_register_platform_intr(plintsrc->type,
 254                                                 plintsrc->global_irq,
 255                                                 plintsrc->io_sapic_vector,
 256                                                 plintsrc->eid,
 257                                                 plintsrc->id,
 258                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 259                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 260                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 261                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 262                                                  ACPI_MADT_TRIGGER_EDGE) ?
 263                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
 264
 265         platform_intr_list[plintsrc->type] = vector;
 266         if (acpi_madt_rev > 1) {
 267                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 268         }
 269
 270         /*
 271          * Save the physical id, so we can check when its being removed
 272          */
 273         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 274
 275         return 0;
 276 }
 277
 278 #ifdef CONFIG_HOTPLUG_CPU
 279 unsigned int can_cpei_retarget(void)
 280 {
 281         extern int cpe_vector;
 282         extern unsigned int force_cpei_retarget;
 283
 284         /*
 285          * Only if CPEI is supported and the override flag
 286          * is present, otherwise return that its re-targettable
 287          * if we are in polling mode.
 288          */
 289         if (cpe_vector > 0) {
 290                 if (acpi_cpei_override || force_cpei_retarget)
 291                         return 1;
 292                 else
 293                         return 0;
 294         }
 295         return 1;
 296 }
 297
 298 unsigned int is_cpu_cpei_target(unsigned int cpu)
 299 {
 300         unsigned int logical_id;
 301
 302         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 303
 304         if (logical_id == cpu)
 305                 return 1;
 306         else
 307                 return 0;
 308 }
 309
 310 void set_cpei_target_cpu(unsigned int cpu)
 311 {
 312         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 313 }
 314 #endif
 315
 316 unsigned int get_cpei_target_cpu(void)
 317 {
 318         return acpi_cpei_phys_cpuid;
 319 }
 320
 321 static int __init
 322 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 323                        const unsigned long end)
 324 {
 325         struct acpi_madt_interrupt_override *p;
 326
 327         p = (struct acpi_madt_interrupt_override *)header;
 328
 329         if (BAD_MADT_ENTRY(p, end))
 330                 return -EINVAL;
 331
 332         iosapic_override_isa_irq(p->source_irq, p->global_irq,
 333                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 334                                   ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 335                                  IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 336                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 337                                  ACPI_MADT_TRIGGER_EDGE) ?
 338                                  IOSAPIC_EDGE : IOSAPIC_LEVEL);
 339         return 0;
 340 }
 341
 342 static int __init
 343 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 344 {
 345         struct acpi_madt_nmi_source *nmi_src;
 346
 347         nmi_src = (struct acpi_madt_nmi_source *)header;
 348
 349         if (BAD_MADT_ENTRY(nmi_src, end))
 350                 return -EINVAL;
 351
 352         /* TBD: Support nimsrc entries */
 353         return 0;
 354 }
 355
 356 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 357 {
 358         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 359
 360                 /*
 361                  * Unfortunately ITC_DRIFT is not yet part of the
 362                  * official SAL spec, so the ITC_DRIFT bit is not
 363                  * set by the BIOS on this hardware.
 364                  */
 365                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 366
 367                 cyclone_setup();
 368         }
 369 }
 370
 371 static int __init acpi_parse_madt(struct acpi_table_header *table)
 372 {
 373         if (!table)
 374                 return -EINVAL;
 375
 376         acpi_madt = (struct acpi_table_madt *)table;
 377
 378         acpi_madt_rev = acpi_madt->header.revision;
 379
 380         /* remember the value for reference after free_initmem() */
 381 #ifdef CONFIG_ITANIUM
 382         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 383 #else
 384         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 385 #endif
 386         iosapic_system_init(has_8259);
 387
 388         /* Get base address of IPI Message Block */
 389
 390         if (acpi_madt->address)
 391                 ipi_base_addr = ioremap(acpi_madt->address, 0);
 392
 393         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 394
 395         acpi_madt_oem_check(acpi_madt->header.oem_id,
 396                             acpi_madt->header.oem_table_id);
 397
 398         return 0;
 399 }
 400
 401 #ifdef CONFIG_ACPI_NUMA
 402
 403 #undef SLIT_DEBUG
 404
 405 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 406
 407 static int __initdata srat_num_cpus;    /* number of cpus */
 408 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
 409 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 410 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 411 static struct acpi_table_slit __initdata *slit_table;
 412
 413 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 414 {
 415         int pxm;
 416
 417         pxm = pa->proximity_domain_lo;
 418         if (ia64_platform_is("sn2"))
 419                 pxm += pa->proximity_domain_hi[0] << 8;
 420         return pxm;
 421 }
 422
 423 static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 424 {
 425         int pxm;
 426
 427         pxm = ma->proximity_domain;
 428         if (!ia64_platform_is("sn2"))
 429                 pxm &= 0xff;
 430
 431         return pxm;
 432 }
 433
 434 /*
 435  * ACPI 2.0 SLIT (System Locality Information Table)
 436  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 437  */
 438 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 439 {
 440         u32 len;
 441
 442         len = sizeof(struct acpi_table_header) + 8
 443             + slit->locality_count * slit->locality_count;
 444         if (slit->header.length != len) {
 445                 printk(KERN_ERR
 446                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 447                        len, slit->header.length);
 448                 memset(numa_slit, 10, sizeof(numa_slit));
 449                 return;
 450         }
 451         slit_table = slit;
 452 }
 453
 454 void __init
 455 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 456 {
 457         int pxm;
 458
 459         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 460                 return;
 461
 462         pxm = get_processor_proximity_domain(pa);
 463
 464         /* record this node in proximity bitmap */
 465         pxm_bit_set(pxm);
 466
 467         node_cpuid[srat_num_cpus].phys_id =
 468             (pa->apic_id << 8) | (pa->local_sapic_eid);
 469         /* nid should be overridden as logical node id later */
 470         node_cpuid[srat_num_cpus].nid = pxm;
 471         srat_num_cpus++;
 472 }
 473
 474 void __init
 475 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 476 {
 477         unsigned long paddr, size;
 478         int pxm;
 479         struct node_memblk_s *p, *q, *pend;
 480
 481         pxm = get_memory_proximity_domain(ma);
 482
 483         /* fill node memory chunk structure */
 484         paddr = ma->base_address;
 485         size = ma->length;
 486
 487         /* Ignore disabled entries */
 488         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 489                 return;
 490
 491         /* record this node in proximity bitmap */
 492         pxm_bit_set(pxm);
 493
 494         /* Insertion sort based on base address */
 495         pend = &node_memblk[num_node_memblks];
 496         for (p = &node_memblk[0]; p < pend; p++) {
 497                 if (paddr < p->start_paddr)
 498                         break;
 499         }
 500         if (p < pend) {
 501                 for (q = pend - 1; q >= p; q--)
 502                         *(q + 1) = *q;
 503         }
 504         p->start_paddr = paddr;
 505         p->size = size;
 506         p->nid = pxm;
 507         num_node_memblks++;
 508 }
 509
 510 void __init acpi_numa_arch_fixup(void)
 511 {
 512         int i, j, node_from, node_to;
 513
 514         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 515         if (srat_num_cpus == 0) {
 516                 node_set_online(0);
 517                 node_cpuid[0].phys_id = hard_smp_processor_id();
 518                 return;
 519         }
 520
 521         /*
 522          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 523          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 524          */
 525         nodes_clear(node_online_map);
 526         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 527                 if (pxm_bit_test(i)) {
 528                         int nid = acpi_map_pxm_to_node(i);
 529                         node_set_online(nid);
 530                 }
 531         }
 532
 533         /* set logical node id in memory chunk structure */
 534         for (i = 0; i < num_node_memblks; i++)
 535                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 536
 537         /* assign memory bank numbers for each chunk on each node */
 538         for_each_online_node(i) {
 539                 int bank;
 540
 541                 bank = 0;
 542                 for (j = 0; j < num_node_memblks; j++)
 543                         if (node_memblk[j].nid == i)
 544                                 node_memblk[j].bank = bank++;
 545         }
 546
 547         /* set logical node id in cpu structure */
 548         for (i = 0; i < srat_num_cpus; i++)
 549                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 550
 551         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 552                num_online_nodes());
 553         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 554                num_node_memblks);
 555
 556         if (!slit_table)
 557                 return;
 558         memset(numa_slit, -1, sizeof(numa_slit));
 559         for (i = 0; i < slit_table->locality_count; i++) {
 560                 if (!pxm_bit_test(i))
 561                         continue;
 562                 node_from = pxm_to_node(i);
 563                 for (j = 0; j < slit_table->locality_count; j++) {
 564                         if (!pxm_bit_test(j))
 565                                 continue;
 566                         node_to = pxm_to_node(j);
 567                         node_distance(node_from, node_to) =
 568                             slit_table->entry[i * slit_table->locality_count + j];
 569                 }
 570         }
 571
 572 #ifdef SLIT_DEBUG
 573         printk("ACPI 2.0 SLIT locality table:\n");
 574         for_each_online_node(i) {
 575                 for_each_online_node(j)
 576                     printk("%03d ", node_distance(i, j));
 577                 printk("\n");
 578         }
 579 #endif
 580 }
 581 #endif                          /* CONFIG_ACPI_NUMA */
 582
 583 /*
 584  * success: return IRQ number (>=0)
 585  * failure: return < 0
 586  */
 587 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 588 {
 589         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 590                 return gsi;
 591
 592         if (has_8259 && gsi < 16)
 593                 return isa_irq_to_vector(gsi);
 594
 595         return iosapic_register_intr(gsi,
 596                                      (polarity ==
 597                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 598                                      IOSAPIC_POL_LOW,
 599                                      (triggering ==
 600                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 601                                      IOSAPIC_LEVEL);
 602 }
 603
 604 EXPORT_SYMBOL(acpi_register_gsi);
 605
 606 void acpi_unregister_gsi(u32 gsi)
 607 {
 608         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 609                 return;
 610
 611         iosapic_unregister_intr(gsi);
 612 }
 613
 614 EXPORT_SYMBOL(acpi_unregister_gsi);
 615
 616 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 617 {
 618         struct acpi_table_header *fadt_header;
 619         struct acpi_table_fadt *fadt;
 620
 621         if (!table)
 622                 return -EINVAL;
 623
 624         fadt_header = (struct acpi_table_header *)table;
 625         if (fadt_header->revision != 3)
 626                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 627
 628         fadt = (struct acpi_table_fadt *)fadt_header;
 629
 630         acpi_register_gsi(fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
 631         return 0;
 632 }
 633
 634 unsigned long __init acpi_find_rsdp(void)
 635 {
 636         unsigned long rsdp_phys = 0;
 637
 638         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 639                 rsdp_phys = efi.acpi20;
 640         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 641                 printk(KERN_WARNING PREFIX
 642                        "v1.0/r0.71 tables no longer supported\n");
 643         return rsdp_phys;
 644 }
 645
 646 int __init acpi_boot_init(void)
 647 {
 648
 649         /*
 650          * MADT
 651          * ----
 652          * Parse the Multiple APIC Description Table (MADT), if exists.
 653          * Note that this table provides platform SMP configuration
 654          * information -- the successor to MPS tables.
 655          */
 656
 657         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 658                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 659                 goto skip_madt;
 660         }
 661
 662         /* Local APIC */
 663
 664         if (acpi_table_parse_madt
 665             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
 666                 printk(KERN_ERR PREFIX
 667                        "Error parsing LAPIC address override entry\n");
 668
 669         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_lsapic, NR_CPUS)
 670             < 1)
 671                 printk(KERN_ERR PREFIX
 672                        "Error parsing MADT - no LAPIC entries\n");
 673
 674         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
 675             < 0)
 676                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 677
 678         /* I/O APIC */
 679
 680         if (acpi_table_parse_madt
 681             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
 682                 if (!ia64_platform_is("sn2"))
 683                         printk(KERN_ERR PREFIX
 684                                "Error parsing MADT - no IOSAPIC entries\n");
 685         }
 686
 687         /* System-Level Interrupt Routing */
 688
 689         if (acpi_table_parse_madt
 690             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
 691              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 692                 printk(KERN_ERR PREFIX
 693                        "Error parsing platform interrupt source entry\n");
 694
 695         if (acpi_table_parse_madt
 696             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
 697                 printk(KERN_ERR PREFIX
 698                        "Error parsing interrupt source overrides entry\n");
 699
 700         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
 701                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 702       skip_madt:
 703
 704         /*
 705          * FADT says whether a legacy keyboard controller is present.
 706          * The FADT also contains an SCI_INT line, by which the system
 707          * gets interrupts such as power and sleep buttons.  If it's not
 708          * on a Legacy interrupt, it needs to be setup.
 709          */
 710         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
 711                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 712
 713 #ifdef CONFIG_SMP
 714         if (available_cpus == 0) {
 715                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 716                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 717                 smp_boot_data.cpu_phys_id[available_cpus] =
 718                     hard_smp_processor_id();
 719                 available_cpus = 1;     /* We've got at least one of these, no? */
 720         }
 721         smp_boot_data.cpu_count = available_cpus;
 722
 723         smp_build_cpu_map();
 724 # ifdef CONFIG_ACPI_NUMA
 725         if (srat_num_cpus == 0) {
 726                 int cpu, i = 1;
 727                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 728                         if (smp_boot_data.cpu_phys_id[cpu] !=
 729                             hard_smp_processor_id())
 730                                 node_cpuid[i++].phys_id =
 731                                     smp_boot_data.cpu_phys_id[cpu];
 732         }
 733 # endif
 734 #endif
 735 #ifdef CONFIG_ACPI_NUMA
 736         build_cpu_to_node_map();
 737 #endif
 738         /* Make boot-up look pretty */
 739         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 740                total_cpus);
 741         return 0;
 742 }
 743
 744 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 745 {
 746         int tmp;
 747
 748         if (has_8259 && gsi < 16)
 749                 *irq = isa_irq_to_vector(gsi);
 750         else {
 751                 tmp = gsi_to_irq(gsi);
 752                 if (tmp == -1)
 753                         return -1;
 754                 *irq = tmp;
 755         }
 756         return 0;
 757 }
 758
 759 /*
 760  *  ACPI based hotplug CPU support
 761  */
 762 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 763 static
 764 int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
 765 {
 766 #ifdef CONFIG_ACPI_NUMA
 767         int pxm_id;
 768         int nid;
 769
 770         pxm_id = acpi_get_pxm(handle);
 771         /*
 772          * We don't have cpu-only-node hotadd. But if the system equips
 773          * SRAT table, pxm is already found and node is ready.
 774          * So, just pxm_to_nid(pxm) is OK.
 775          * This code here is for the system which doesn't have full SRAT
 776          * table for possible cpus.
 777          */
 778         nid = acpi_map_pxm_to_node(pxm_id);
 779         node_cpuid[cpu].phys_id = physid;
 780         node_cpuid[cpu].nid = nid;
 781 #endif
 782         return (0);
 783 }
 784
 785 int additional_cpus __initdata = -1;
 786
 787 static __init int setup_additional_cpus(char *s)
 788 {
 789         if (s)
 790                 additional_cpus = simple_strtol(s, NULL, 0);
 791
 792         return 0;
 793 }
 794
 795 early_param("additional_cpus", setup_additional_cpus);
 796
 797 /*
 798  * cpu_possible_map should be static, it cannot change as CPUs
 799  * are onlined, or offlined. The reason is per-cpu data-structures
 800  * are allocated by some modules at init time, and dont expect to
 801  * do this dynamically on cpu arrival/departure.
 802  * cpu_present_map on the other hand can change dynamically.
 803  * In case when cpu_hotplug is not compiled, then we resort to current
 804  * behaviour, which is cpu_possible == cpu_present.
 805  * - Ashok Raj
 806  *
 807  * Three ways to find out the number of additional hotplug CPUs:
 808  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 809  * - The user can overwrite it with additional_cpus=NUM
 810  * - Otherwise don't reserve additional CPUs.
 811  */
 812 __init void prefill_possible_map(void)
 813 {
 814         int i;
 815         int possible, disabled_cpus;
 816
 817         disabled_cpus = total_cpus - available_cpus;
 818
 819         if (additional_cpus == -1) {
 820                 if (disabled_cpus > 0)
 821                         additional_cpus = disabled_cpus;
 822                 else
 823                         additional_cpus = 0;
 824         }
 825
 826         possible = available_cpus + additional_cpus;
 827
 828         if (possible > NR_CPUS)
 829                 possible = NR_CPUS;
 830
 831         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 832                 possible, max((possible - available_cpus), 0));
 833
 834         for (i = 0; i < possible; i++)
 835                 cpu_set(i, cpu_possible_map);
 836 }
 837
 838 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 839 {
 840         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 841         union acpi_object *obj;
 842         struct acpi_madt_local_sapic *lsapic;
 843         cpumask_t tmp_map;
 844         long physid;
 845         int cpu;
 846
 847         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 848                 return -EINVAL;
 849
 850         if (!buffer.length || !buffer.pointer)
 851                 return -EINVAL;
 852
 853         obj = buffer.pointer;
 854         if (obj->type != ACPI_TYPE_BUFFER)
 855         {
 856                 kfree(buffer.pointer);
 857                 return -EINVAL;
 858         }
 859
 860         lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
 861
 862         if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
 863             (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
 864                 kfree(buffer.pointer);
 865                 return -EINVAL;
 866         }
 867
 868         physid = ((lsapic->id << 8) | (lsapic->eid));
 869
 870         kfree(buffer.pointer);
 871         buffer.length = ACPI_ALLOCATE_BUFFER;
 872         buffer.pointer = NULL;
 873
 874         cpus_complement(tmp_map, cpu_present_map);
 875         cpu = first_cpu(tmp_map);
 876         if (cpu >= NR_CPUS)
 877                 return -EINVAL;
 878
 879         acpi_map_cpu2node(handle, cpu, physid);
 880
 881         cpu_set(cpu, cpu_present_map);
 882         ia64_cpu_to_sapicid[cpu] = physid;
 883
 884         *pcpu = cpu;
 885         return (0);
 886 }
 887
 888 EXPORT_SYMBOL(acpi_map_lsapic);
 889
 890 int acpi_unmap_lsapic(int cpu)
 891 {
 892         ia64_cpu_to_sapicid[cpu] = -1;
 893         cpu_clear(cpu, cpu_present_map);
 894
 895 #ifdef CONFIG_ACPI_NUMA
 896         /* NUMA specific cleanup's */
 897 #endif
 898
 899         return (0);
 900 }
 901
 902 EXPORT_SYMBOL(acpi_unmap_lsapic);
 903 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 904
 905 #ifdef CONFIG_ACPI_NUMA
 906 static acpi_status __devinit
 907 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
 908 {
 909         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 910         union acpi_object *obj;
 911         struct acpi_madt_io_sapic *iosapic;
 912         unsigned int gsi_base;
 913         int pxm, node;
 914
 915         /* Only care about objects w/ a method that returns the MADT */
 916         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 917                 return AE_OK;
 918
 919         if (!buffer.length || !buffer.pointer)
 920                 return AE_OK;
 921
 922         obj = buffer.pointer;
 923         if (obj->type != ACPI_TYPE_BUFFER ||
 924             obj->buffer.length < sizeof(*iosapic)) {
 925                 kfree(buffer.pointer);
 926                 return AE_OK;
 927         }
 928
 929         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 930
 931         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 932                 kfree(buffer.pointer);
 933                 return AE_OK;
 934         }
 935
 936         gsi_base = iosapic->global_irq_base;
 937
 938         kfree(buffer.pointer);
 939
 940         /*
 941          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
 942          * us which node to associate this with.
 943          */
 944         pxm = acpi_get_pxm(handle);
 945         if (pxm < 0)
 946                 return AE_OK;
 947
 948         node = pxm_to_node(pxm);
 949
 950         if (node >= MAX_NUMNODES || !node_online(node) ||
 951             cpus_empty(node_to_cpumask(node)))
 952                 return AE_OK;
 953
 954         /* We know a gsi to node mapping! */
 955         map_iosapic_to_node(gsi_base, node);
 956         return AE_OK;
 957 }
 958
 959 static int __init
 960 acpi_map_iosapics (void)
 961 {
 962         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
 963         return 0;
 964 }
 965
 966 fs_initcall(acpi_map_iosapics);
 967 #endif                          /* CONFIG_ACPI_NUMA */
 968
 969 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 970 {
 971         int err;
 972
 973         if ((err = iosapic_init(phys_addr, gsi_base)))
 974                 return err;
 975
 976 #ifdef CONFIG_ACPI_NUMA
 977         acpi_map_iosapic(handle, 0, NULL, NULL);
 978 #endif                          /* CONFIG_ACPI_NUMA */
 979
 980         return 0;
 981 }
 982
 983 EXPORT_SYMBOL(acpi_register_ioapic);
 984
 985 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 986 {
 987         return iosapic_remove(gsi_base);
 988 }
 989
 990 EXPORT_SYMBOL(acpi_unregister_ioapic);
 991
 992 /*
 993  * acpi_save_state_mem() - save kernel state
 994  *
 995  * TBD when when IA64 starts to support suspend...
 996  */
 997 int acpi_save_state_mem(void) { return 0; }
 998
 999 /*
1000  * acpi_restore_state()
1001  */
1002 void acpi_restore_state_mem(void) {}
1003
1004 /*
1005  * do_suspend_lowlevel()
1006  */
1007 void do_suspend_lowlevel(void) {}
1008
1009 #endif                          /* CONFIG_ACPI */