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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/config.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/kernel.h>
  39 #include <linux/sched.h>
  40 #include <linux/smp.h>
  41 #include <linux/string.h>
  42 #include <linux/types.h>
  43 #include <linux/irq.h>
  44 #include <linux/acpi.h>
  45 #include <linux/efi.h>
  46 #include <linux/mmzone.h>
  47 #include <linux/nodemask.h>
  48 #include <asm/io.h>
  49 #include <asm/iosapic.h>
  50 #include <asm/machvec.h>
  51 #include <asm/page.h>
  52 #include <asm/system.h>
  53 #include <asm/numa.h>
  54 #include <asm/sal.h>
  55 #include <asm/cyclone.h>
  56
  57 #define BAD_MADT_ENTRY(entry, end) (                                        \
  58                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  59                 ((acpi_table_entry_header *)entry)->length != sizeof(*entry))
  60
  61 #define PREFIX                  "ACPI: "
  62
  63 void (*pm_idle) (void);
  64 EXPORT_SYMBOL(pm_idle);
  65 void (*pm_power_off) (void);
  66 EXPORT_SYMBOL(pm_power_off);
  67
  68 unsigned char acpi_kbd_controller_present = 1;
  69 unsigned char acpi_legacy_devices;
  70
  71 unsigned int acpi_cpei_override;
  72 unsigned int acpi_cpei_phys_cpuid;
  73
  74 #define MAX_SAPICS 256
  75 u16 ia64_acpiid_to_sapicid[MAX_SAPICS] = {[0 ... MAX_SAPICS - 1] = -1 };
  76
  77 EXPORT_SYMBOL(ia64_acpiid_to_sapicid);
  78
  79 const char *acpi_get_sysname(void)
  80 {
  81 #ifdef CONFIG_IA64_GENERIC
  82         unsigned long rsdp_phys;
  83         struct acpi20_table_rsdp *rsdp;
  84         struct acpi_table_xsdt *xsdt;
  85         struct acpi_table_header *hdr;
  86
  87         rsdp_phys = acpi_find_rsdp();
  88         if (!rsdp_phys) {
  89                 printk(KERN_ERR
  90                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  91                 return "dig";
  92         }
  93
  94         rsdp = (struct acpi20_table_rsdp *)__va(rsdp_phys);
  95         if (strncmp(rsdp->signature, RSDP_SIG, sizeof(RSDP_SIG) - 1)) {
  96                 printk(KERN_ERR
  97                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
  98                 return "dig";
  99         }
 100
 101         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_address);
 102         hdr = &xsdt->header;
 103         if (strncmp(hdr->signature, XSDT_SIG, sizeof(XSDT_SIG) - 1)) {
 104                 printk(KERN_ERR
 105                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 106                 return "dig";
 107         }
 108
 109         if (!strcmp(hdr->oem_id, "HP")) {
 110                 return "hpzx1";
 111         } else if (!strcmp(hdr->oem_id, "SGI")) {
 112                 return "sn2";
 113         }
 114
 115         return "dig";
 116 #else
 117 # if defined (CONFIG_IA64_HP_SIM)
 118         return "hpsim";
 119 # elif defined (CONFIG_IA64_HP_ZX1)
 120         return "hpzx1";
 121 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
 122         return "hpzx1_swiotlb";
 123 # elif defined (CONFIG_IA64_SGI_SN2)
 124         return "sn2";
 125 # elif defined (CONFIG_IA64_DIG)
 126         return "dig";
 127 # else
 128 #       error Unknown platform.  Fix acpi.c.
 129 # endif
 130 #endif
 131 }
 132
 133 #ifdef CONFIG_ACPI
 134
 135 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 136
 137 /* Array to record platform interrupt vectors for generic interrupt routing. */
 138 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 139         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 140 };
 141
 142 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 143
 144 /*
 145  * Interrupt routing API for device drivers.  Provides interrupt vector for
 146  * a generic platform event.  Currently only CPEI is implemented.
 147  */
 148 int acpi_request_vector(u32 int_type)
 149 {
 150         int vector = -1;
 151
 152         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 153                 /* corrected platform error interrupt */
 154                 vector = platform_intr_list[int_type];
 155         } else
 156                 printk(KERN_ERR
 157                        "acpi_request_vector(): invalid interrupt type\n");
 158         return vector;
 159 }
 160
 161 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 162 {
 163         return __va(phys_addr);
 164 }
 165
 166 /* --------------------------------------------------------------------------
 167                             Boot-time Table Parsing
 168    -------------------------------------------------------------------------- */
 169
 170 static int total_cpus __initdata;
 171 static int available_cpus __initdata;
 172 struct acpi_table_madt *acpi_madt __initdata;
 173 static u8 has_8259;
 174
 175 static int __init
 176 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
 177                           const unsigned long end)
 178 {
 179         struct acpi_table_lapic_addr_ovr *lapic;
 180
 181         lapic = (struct acpi_table_lapic_addr_ovr *)header;
 182
 183         if (BAD_MADT_ENTRY(lapic, end))
 184                 return -EINVAL;
 185
 186         if (lapic->address) {
 187                 iounmap(ipi_base_addr);
 188                 ipi_base_addr = ioremap(lapic->address, 0);
 189         }
 190         return 0;
 191 }
 192
 193 static int __init
 194 acpi_parse_lsapic(acpi_table_entry_header * header, const unsigned long end)
 195 {
 196         struct acpi_table_lsapic *lsapic;
 197
 198         lsapic = (struct acpi_table_lsapic *)header;
 199
 200         if (BAD_MADT_ENTRY(lsapic, end))
 201                 return -EINVAL;
 202
 203         if (lsapic->flags.enabled) {
 204 #ifdef CONFIG_SMP
 205                 smp_boot_data.cpu_phys_id[available_cpus] =
 206                     (lsapic->id << 8) | lsapic->eid;
 207 #endif
 208                 ia64_acpiid_to_sapicid[lsapic->acpi_id] =
 209                     (lsapic->id << 8) | lsapic->eid;
 210                 ++available_cpus;
 211         }
 212
 213         total_cpus++;
 214         return 0;
 215 }
 216
 217 static int __init
 218 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
 219 {
 220         struct acpi_table_lapic_nmi *lacpi_nmi;
 221
 222         lacpi_nmi = (struct acpi_table_lapic_nmi *)header;
 223
 224         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 225                 return -EINVAL;
 226
 227         /* TBD: Support lapic_nmi entries */
 228         return 0;
 229 }
 230
 231 static int __init
 232 acpi_parse_iosapic(acpi_table_entry_header * header, const unsigned long end)
 233 {
 234         struct acpi_table_iosapic *iosapic;
 235
 236         iosapic = (struct acpi_table_iosapic *)header;
 237
 238         if (BAD_MADT_ENTRY(iosapic, end))
 239                 return -EINVAL;
 240
 241         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 242 }
 243
 244 static unsigned int __initdata acpi_madt_rev;
 245
 246 static int __init
 247 acpi_parse_plat_int_src(acpi_table_entry_header * header,
 248                         const unsigned long end)
 249 {
 250         struct acpi_table_plat_int_src *plintsrc;
 251         int vector;
 252
 253         plintsrc = (struct acpi_table_plat_int_src *)header;
 254
 255         if (BAD_MADT_ENTRY(plintsrc, end))
 256                 return -EINVAL;
 257
 258         /*
 259          * Get vector assignment for this interrupt, set attributes,
 260          * and program the IOSAPIC routing table.
 261          */
 262         vector = iosapic_register_platform_intr(plintsrc->type,
 263                                                 plintsrc->global_irq,
 264                                                 plintsrc->iosapic_vector,
 265                                                 plintsrc->eid,
 266                                                 plintsrc->id,
 267                                                 (plintsrc->flags.polarity ==
 268                                                  1) ? IOSAPIC_POL_HIGH :
 269                                                 IOSAPIC_POL_LOW,
 270                                                 (plintsrc->flags.trigger ==
 271                                                  1) ? IOSAPIC_EDGE :
 272                                                 IOSAPIC_LEVEL);
 273
 274         platform_intr_list[plintsrc->type] = vector;
 275         if (acpi_madt_rev > 1) {
 276                 acpi_cpei_override = plintsrc->plint_flags.cpei_override_flag;
 277         }
 278
 279         /*
 280          * Save the physical id, so we can check when its being removed
 281          */
 282         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 283
 284         return 0;
 285 }
 286
 287 #ifdef CONFIG_HOTPLUG_CPU
 288 unsigned int can_cpei_retarget(void)
 289 {
 290         extern int cpe_vector;
 291         extern unsigned int force_cpei_retarget;
 292
 293         /*
 294          * Only if CPEI is supported and the override flag
 295          * is present, otherwise return that its re-targettable
 296          * if we are in polling mode.
 297          */
 298         if (cpe_vector > 0) {
 299                 if (acpi_cpei_override || force_cpei_retarget)
 300                         return 1;
 301                 else
 302                         return 0;
 303         }
 304         return 1;
 305 }
 306
 307 unsigned int is_cpu_cpei_target(unsigned int cpu)
 308 {
 309         unsigned int logical_id;
 310
 311         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 312
 313         if (logical_id == cpu)
 314                 return 1;
 315         else
 316                 return 0;
 317 }
 318
 319 void set_cpei_target_cpu(unsigned int cpu)
 320 {
 321         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 322 }
 323 #endif
 324
 325 unsigned int get_cpei_target_cpu(void)
 326 {
 327         return acpi_cpei_phys_cpuid;
 328 }
 329
 330 static int __init
 331 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
 332                        const unsigned long end)
 333 {
 334         struct acpi_table_int_src_ovr *p;
 335
 336         p = (struct acpi_table_int_src_ovr *)header;
 337
 338         if (BAD_MADT_ENTRY(p, end))
 339                 return -EINVAL;
 340
 341         iosapic_override_isa_irq(p->bus_irq, p->global_irq,
 342                                  (p->flags.polarity ==
 343                                   1) ? IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 344                                  (p->flags.trigger ==
 345                                   1) ? IOSAPIC_EDGE : IOSAPIC_LEVEL);
 346         return 0;
 347 }
 348
 349 static int __init
 350 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
 351 {
 352         struct acpi_table_nmi_src *nmi_src;
 353
 354         nmi_src = (struct acpi_table_nmi_src *)header;
 355
 356         if (BAD_MADT_ENTRY(nmi_src, end))
 357                 return -EINVAL;
 358
 359         /* TBD: Support nimsrc entries */
 360         return 0;
 361 }
 362
 363 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 364 {
 365         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 366
 367                 /*
 368                  * Unfortunately ITC_DRIFT is not yet part of the
 369                  * official SAL spec, so the ITC_DRIFT bit is not
 370                  * set by the BIOS on this hardware.
 371                  */
 372                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 373
 374                 cyclone_setup();
 375         }
 376 }
 377
 378 static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
 379 {
 380         if (!phys_addr || !size)
 381                 return -EINVAL;
 382
 383         acpi_madt = (struct acpi_table_madt *)__va(phys_addr);
 384
 385         acpi_madt_rev = acpi_madt->header.revision;
 386
 387         /* remember the value for reference after free_initmem() */
 388 #ifdef CONFIG_ITANIUM
 389         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 390 #else
 391         has_8259 = acpi_madt->flags.pcat_compat;
 392 #endif
 393         iosapic_system_init(has_8259);
 394
 395         /* Get base address of IPI Message Block */
 396
 397         if (acpi_madt->lapic_address)
 398                 ipi_base_addr = ioremap(acpi_madt->lapic_address, 0);
 399
 400         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 401
 402         acpi_madt_oem_check(acpi_madt->header.oem_id,
 403                             acpi_madt->header.oem_table_id);
 404
 405         return 0;
 406 }
 407
 408 #ifdef CONFIG_ACPI_NUMA
 409
 410 #undef SLIT_DEBUG
 411
 412 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 413
 414 static int __initdata srat_num_cpus;    /* number of cpus */
 415 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
 416 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 417 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 418 static struct acpi_table_slit __initdata *slit_table;
 419
 420 static int get_processor_proximity_domain(struct acpi_table_processor_affinity *pa)
 421 {
 422         int pxm;
 423
 424         pxm = pa->proximity_domain;
 425         if (ia64_platform_is("sn2"))
 426                 pxm += pa->reserved[0] << 8;
 427         return pxm;
 428 }
 429
 430 static int get_memory_proximity_domain(struct acpi_table_memory_affinity *ma)
 431 {
 432         int pxm;
 433
 434         pxm = ma->proximity_domain;
 435         if (ia64_platform_is("sn2"))
 436                 pxm += ma->reserved1[0] << 8;
 437         return pxm;
 438 }
 439
 440 /*
 441  * ACPI 2.0 SLIT (System Locality Information Table)
 442  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 443  */
 444 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 445 {
 446         u32 len;
 447
 448         len = sizeof(struct acpi_table_header) + 8
 449             + slit->localities * slit->localities;
 450         if (slit->header.length != len) {
 451                 printk(KERN_ERR
 452                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 453                        len, slit->header.length);
 454                 memset(numa_slit, 10, sizeof(numa_slit));
 455                 return;
 456         }
 457         slit_table = slit;
 458 }
 459
 460 void __init
 461 acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity *pa)
 462 {
 463         int pxm;
 464
 465         if (!pa->flags.enabled)
 466                 return;
 467
 468         pxm = get_processor_proximity_domain(pa);
 469
 470         /* record this node in proximity bitmap */
 471         pxm_bit_set(pxm);
 472
 473         node_cpuid[srat_num_cpus].phys_id =
 474             (pa->apic_id << 8) | (pa->lsapic_eid);
 475         /* nid should be overridden as logical node id later */
 476         node_cpuid[srat_num_cpus].nid = pxm;
 477         srat_num_cpus++;
 478 }
 479
 480 void __init
 481 acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
 482 {
 483         unsigned long paddr, size;
 484         int pxm;
 485         struct node_memblk_s *p, *q, *pend;
 486
 487         pxm = get_memory_proximity_domain(ma);
 488
 489         /* fill node memory chunk structure */
 490         paddr = ma->base_addr_hi;
 491         paddr = (paddr << 32) | ma->base_addr_lo;
 492         size = ma->length_hi;
 493         size = (size << 32) | ma->length_lo;
 494
 495         /* Ignore disabled entries */
 496         if (!ma->flags.enabled)
 497                 return;
 498
 499         /* record this node in proximity bitmap */
 500         pxm_bit_set(pxm);
 501
 502         /* Insertion sort based on base address */
 503         pend = &node_memblk[num_node_memblks];
 504         for (p = &node_memblk[0]; p < pend; p++) {
 505                 if (paddr < p->start_paddr)
 506                         break;
 507         }
 508         if (p < pend) {
 509                 for (q = pend - 1; q >= p; q--)
 510                         *(q + 1) = *q;
 511         }
 512         p->start_paddr = paddr;
 513         p->size = size;
 514         p->nid = pxm;
 515         num_node_memblks++;
 516 }
 517
 518 void __init acpi_numa_arch_fixup(void)
 519 {
 520         int i, j, node_from, node_to;
 521
 522         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 523         if (srat_num_cpus == 0) {
 524                 node_set_online(0);
 525                 node_cpuid[0].phys_id = hard_smp_processor_id();
 526                 return;
 527         }
 528
 529         /*
 530          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 531          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 532          */
 533         nodes_clear(node_online_map);
 534         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 535                 if (pxm_bit_test(i)) {
 536                         int nid = acpi_map_pxm_to_node(i);
 537                         node_set_online(nid);
 538                 }
 539         }
 540
 541         /* set logical node id in memory chunk structure */
 542         for (i = 0; i < num_node_memblks; i++)
 543                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 544
 545         /* assign memory bank numbers for each chunk on each node */
 546         for_each_online_node(i) {
 547                 int bank;
 548
 549                 bank = 0;
 550                 for (j = 0; j < num_node_memblks; j++)
 551                         if (node_memblk[j].nid == i)
 552                                 node_memblk[j].bank = bank++;
 553         }
 554
 555         /* set logical node id in cpu structure */
 556         for (i = 0; i < srat_num_cpus; i++)
 557                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 558
 559         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 560                num_online_nodes());
 561         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 562                num_node_memblks);
 563
 564         if (!slit_table)
 565                 return;
 566         memset(numa_slit, -1, sizeof(numa_slit));
 567         for (i = 0; i < slit_table->localities; i++) {
 568                 if (!pxm_bit_test(i))
 569                         continue;
 570                 node_from = pxm_to_node(i);
 571                 for (j = 0; j < slit_table->localities; j++) {
 572                         if (!pxm_bit_test(j))
 573                                 continue;
 574                         node_to = pxm_to_node(j);
 575                         node_distance(node_from, node_to) =
 576                             slit_table->entry[i * slit_table->localities + j];
 577                 }
 578         }
 579
 580 #ifdef SLIT_DEBUG
 581         printk("ACPI 2.0 SLIT locality table:\n");
 582         for_each_online_node(i) {
 583                 for_each_online_node(j)
 584                     printk("%03d ", node_distance(i, j));
 585                 printk("\n");
 586         }
 587 #endif
 588 }
 589 #endif                          /* CONFIG_ACPI_NUMA */
 590
 591 /*
 592  * success: return IRQ number (>=0)
 593  * failure: return < 0
 594  */
 595 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 596 {
 597         if (has_8259 && gsi < 16)
 598                 return isa_irq_to_vector(gsi);
 599
 600         return iosapic_register_intr(gsi,
 601                                      (polarity ==
 602                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 603                                      IOSAPIC_POL_LOW,
 604                                      (triggering ==
 605                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 606                                      IOSAPIC_LEVEL);
 607 }
 608
 609 EXPORT_SYMBOL(acpi_register_gsi);
 610
 611 void acpi_unregister_gsi(u32 gsi)
 612 {
 613         iosapic_unregister_intr(gsi);
 614 }
 615
 616 EXPORT_SYMBOL(acpi_unregister_gsi);
 617
 618 static int __init acpi_parse_fadt(unsigned long phys_addr, unsigned long size)
 619 {
 620         struct acpi_table_header *fadt_header;
 621         struct fadt_descriptor *fadt;
 622
 623         if (!phys_addr || !size)
 624                 return -EINVAL;
 625
 626         fadt_header = (struct acpi_table_header *)__va(phys_addr);
 627         if (fadt_header->revision != 3)
 628                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 629
 630         fadt = (struct fadt_descriptor *)fadt_header;
 631
 632         if (!(fadt->iapc_boot_arch & BAF_8042_KEYBOARD_CONTROLLER))
 633                 acpi_kbd_controller_present = 0;
 634
 635         if (fadt->iapc_boot_arch & BAF_LEGACY_DEVICES)
 636                 acpi_legacy_devices = 1;
 637
 638         acpi_register_gsi(fadt->sci_int, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
 639         return 0;
 640 }
 641
 642 unsigned long __init acpi_find_rsdp(void)
 643 {
 644         unsigned long rsdp_phys = 0;
 645
 646         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 647                 rsdp_phys = efi.acpi20;
 648         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 649                 printk(KERN_WARNING PREFIX
 650                        "v1.0/r0.71 tables no longer supported\n");
 651         return rsdp_phys;
 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_APIC, acpi_parse_madt) < 1) {
 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_LAPIC_ADDR_OVR, 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_LSAPIC, 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_LAPIC_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_IOSAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1)
 690                 printk(KERN_ERR PREFIX
 691                        "Error parsing MADT - no IOSAPIC entries\n");
 692
 693         /* System-Level Interrupt Routing */
 694
 695         if (acpi_table_parse_madt
 696             (ACPI_MADT_PLAT_INT_SRC, acpi_parse_plat_int_src,
 697              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 698                 printk(KERN_ERR PREFIX
 699                        "Error parsing platform interrupt source entry\n");
 700
 701         if (acpi_table_parse_madt
 702             (ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr, 0) < 0)
 703                 printk(KERN_ERR PREFIX
 704                        "Error parsing interrupt source overrides entry\n");
 705
 706         if (acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src, 0) < 0)
 707                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 708       skip_madt:
 709
 710         /*
 711          * FADT says whether a legacy keyboard controller is present.
 712          * The FADT also contains an SCI_INT line, by which the system
 713          * gets interrupts such as power and sleep buttons.  If it's not
 714          * on a Legacy interrupt, it needs to be setup.
 715          */
 716         if (acpi_table_parse(ACPI_FADT, acpi_parse_fadt) < 1)
 717                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 718
 719 #ifdef CONFIG_SMP
 720         if (available_cpus == 0) {
 721                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 722                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 723                 smp_boot_data.cpu_phys_id[available_cpus] =
 724                     hard_smp_processor_id();
 725                 available_cpus = 1;     /* We've got at least one of these, no? */
 726         }
 727         smp_boot_data.cpu_count = available_cpus;
 728
 729         smp_build_cpu_map();
 730 # ifdef CONFIG_ACPI_NUMA
 731         if (srat_num_cpus == 0) {
 732                 int cpu, i = 1;
 733                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 734                         if (smp_boot_data.cpu_phys_id[cpu] !=
 735                             hard_smp_processor_id())
 736                                 node_cpuid[i++].phys_id =
 737                                     smp_boot_data.cpu_phys_id[cpu];
 738         }
 739 # endif
 740 #endif
 741 #ifdef CONFIG_ACPI_NUMA
 742         build_cpu_to_node_map();
 743 #endif
 744         /* Make boot-up look pretty */
 745         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 746                total_cpus);
 747         return 0;
 748 }
 749
 750 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 751 {
 752         int vector;
 753
 754         if (has_8259 && gsi < 16)
 755                 *irq = isa_irq_to_vector(gsi);
 756         else {
 757                 vector = gsi_to_vector(gsi);
 758                 if (vector == -1)
 759                         return -1;
 760
 761                 *irq = vector;
 762         }
 763         return 0;
 764 }
 765
 766 /*
 767  *  ACPI based hotplug CPU support
 768  */
 769 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 770 static
 771 int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
 772 {
 773 #ifdef CONFIG_ACPI_NUMA
 774         int pxm_id;
 775
 776         pxm_id = acpi_get_pxm(handle);
 777
 778         /*
 779          * Assuming that the container driver would have set the proximity
 780          * domain and would have initialized pxm_to_node(pxm_id) && pxm_flag
 781          */
 782         node_cpuid[cpu].nid = (pxm_id < 0) ? 0 : pxm_to_node(pxm_id);
 783
 784         node_cpuid[cpu].phys_id = physid;
 785 #endif
 786         return (0);
 787 }
 788
 789 int additional_cpus __initdata = -1;
 790
 791 static __init int setup_additional_cpus(char *s)
 792 {
 793         if (s)
 794                 additional_cpus = simple_strtol(s, NULL, 0);
 795
 796         return 0;
 797 }
 798
 799 early_param("additional_cpus", setup_additional_cpus);
 800
 801 /*
 802  * cpu_possible_map should be static, it cannot change as cpu's
 803  * are onlined, or offlined. The reason is per-cpu data-structures
 804  * are allocated by some modules at init time, and dont expect to
 805  * do this dynamically on cpu arrival/departure.
 806  * cpu_present_map on the other hand can change dynamically.
 807  * In case when cpu_hotplug is not compiled, then we resort to current
 808  * behaviour, which is cpu_possible == cpu_present.
 809  * - Ashok Raj
 810  *
 811  * Three ways to find out the number of additional hotplug CPUs:
 812  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 813  * - The user can overwrite it with additional_cpus=NUM
 814  * - Otherwise don't reserve additional CPUs.
 815  */
 816 __init void prefill_possible_map(void)
 817 {
 818         int i;
 819         int possible, disabled_cpus;
 820
 821         disabled_cpus = total_cpus - available_cpus;
 822
 823         if (additional_cpus == -1) {
 824                 if (disabled_cpus > 0)
 825                         additional_cpus = disabled_cpus;
 826                 else
 827                         additional_cpus = 0;
 828         }
 829
 830         possible = available_cpus + additional_cpus;
 831
 832         if (possible > NR_CPUS)
 833                 possible = NR_CPUS;
 834
 835         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 836                 possible, max((possible - available_cpus), 0));
 837
 838         for (i = 0; i < possible; i++)
 839                 cpu_set(i, cpu_possible_map);
 840 }
 841
 842 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 843 {
 844         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 845         union acpi_object *obj;
 846         struct acpi_table_lsapic *lsapic;
 847         cpumask_t tmp_map;
 848         long physid;
 849         int cpu;
 850
 851         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 852                 return -EINVAL;
 853
 854         if (!buffer.length || !buffer.pointer)
 855                 return -EINVAL;
 856
 857         obj = buffer.pointer;
 858         if (obj->type != ACPI_TYPE_BUFFER ||
 859             obj->buffer.length < sizeof(*lsapic)) {
 860                 acpi_os_free(buffer.pointer);
 861                 return -EINVAL;
 862         }
 863
 864         lsapic = (struct acpi_table_lsapic *)obj->buffer.pointer;
 865
 866         if ((lsapic->header.type != ACPI_MADT_LSAPIC) ||
 867             (!lsapic->flags.enabled)) {
 868                 acpi_os_free(buffer.pointer);
 869                 return -EINVAL;
 870         }
 871
 872         physid = ((lsapic->id << 8) | (lsapic->eid));
 873
 874         acpi_os_free(buffer.pointer);
 875         buffer.length = ACPI_ALLOCATE_BUFFER;
 876         buffer.pointer = NULL;
 877
 878         cpus_complement(tmp_map, cpu_present_map);
 879         cpu = first_cpu(tmp_map);
 880         if (cpu >= NR_CPUS)
 881                 return -EINVAL;
 882
 883         acpi_map_cpu2node(handle, cpu, physid);
 884
 885         cpu_set(cpu, cpu_present_map);
 886         ia64_cpu_to_sapicid[cpu] = physid;
 887         ia64_acpiid_to_sapicid[lsapic->acpi_id] = ia64_cpu_to_sapicid[cpu];
 888
 889         *pcpu = cpu;
 890         return (0);
 891 }
 892
 893 EXPORT_SYMBOL(acpi_map_lsapic);
 894
 895 int acpi_unmap_lsapic(int cpu)
 896 {
 897         int i;
 898
 899         for (i = 0; i < MAX_SAPICS; i++) {
 900                 if (ia64_acpiid_to_sapicid[i] == ia64_cpu_to_sapicid[cpu]) {
 901                         ia64_acpiid_to_sapicid[i] = -1;
 902                         break;
 903                 }
 904         }
 905         ia64_cpu_to_sapicid[cpu] = -1;
 906         cpu_clear(cpu, cpu_present_map);
 907
 908 #ifdef CONFIG_ACPI_NUMA
 909         /* NUMA specific cleanup's */
 910 #endif
 911
 912         return (0);
 913 }
 914
 915 EXPORT_SYMBOL(acpi_unmap_lsapic);
 916 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 917
 918 #ifdef CONFIG_ACPI_NUMA
 919 static acpi_status __devinit
 920 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
 921 {
 922         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 923         union acpi_object *obj;
 924         struct acpi_table_iosapic *iosapic;
 925         unsigned int gsi_base;
 926         int pxm, node;
 927
 928         /* Only care about objects w/ a method that returns the MADT */
 929         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 930                 return AE_OK;
 931
 932         if (!buffer.length || !buffer.pointer)
 933                 return AE_OK;
 934
 935         obj = buffer.pointer;
 936         if (obj->type != ACPI_TYPE_BUFFER ||
 937             obj->buffer.length < sizeof(*iosapic)) {
 938                 acpi_os_free(buffer.pointer);
 939                 return AE_OK;
 940         }
 941
 942         iosapic = (struct acpi_table_iosapic *)obj->buffer.pointer;
 943
 944         if (iosapic->header.type != ACPI_MADT_IOSAPIC) {
 945                 acpi_os_free(buffer.pointer);
 946                 return AE_OK;
 947         }
 948
 949         gsi_base = iosapic->global_irq_base;
 950
 951         acpi_os_free(buffer.pointer);
 952
 953         /*
 954          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
 955          * us which node to associate this with.
 956          */
 957         pxm = acpi_get_pxm(handle);
 958         if (pxm < 0)
 959                 return AE_OK;
 960
 961         node = pxm_to_node(pxm);
 962
 963         if (node >= MAX_NUMNODES || !node_online(node) ||
 964             cpus_empty(node_to_cpumask(node)))
 965                 return AE_OK;
 966
 967         /* We know a gsi to node mapping! */
 968         map_iosapic_to_node(gsi_base, node);
 969         return AE_OK;
 970 }
 971
 972 static int __init
 973 acpi_map_iosapics (void)
 974 {
 975         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
 976         return 0;
 977 }
 978
 979 fs_initcall(acpi_map_iosapics);
 980 #endif                          /* CONFIG_ACPI_NUMA */
 981
 982 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 983 {
 984         int err;
 985
 986         if ((err = iosapic_init(phys_addr, gsi_base)))
 987                 return err;
 988
 989 #ifdef CONFIG_ACPI_NUMA
 990         acpi_map_iosapic(handle, 0, NULL, NULL);
 991 #endif                          /* CONFIG_ACPI_NUMA */
 992
 993         return 0;
 994 }
 995
 996 EXPORT_SYMBOL(acpi_register_ioapic);
 997
 998 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 999 {
1000         return iosapic_remove(gsi_base);
1001 }
1002
1003 EXPORT_SYMBOL(acpi_unregister_ioapic);
1004
1005 #endif                          /* CONFIG_ACPI */