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 int acpi_cpei_override;
  68 unsigned int acpi_cpei_phys_cpuid;
  69
  70 #define MAX_SAPICS 256
  71 u16 ia64_acpiid_to_sapicid[MAX_SAPICS] = {[0 ... MAX_SAPICS - 1] = -1 };
  72
  73 EXPORT_SYMBOL(ia64_acpiid_to_sapicid);
  74
  75 const char *acpi_get_sysname(void)
  76 {
  77 #ifdef CONFIG_IA64_GENERIC
  78         unsigned long rsdp_phys;
  79         struct acpi20_table_rsdp *rsdp;
  80         struct acpi_table_xsdt *xsdt;
  81         struct acpi_table_header *hdr;
  82
  83         rsdp_phys = acpi_find_rsdp();
  84         if (!rsdp_phys) {
  85                 printk(KERN_ERR
  86                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  87                 return "dig";
  88         }
  89
  90         rsdp = (struct acpi20_table_rsdp *)__va(rsdp_phys);
  91         if (strncmp(rsdp->signature, RSDP_SIG, sizeof(RSDP_SIG) - 1)) {
  92                 printk(KERN_ERR
  93                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
  94                 return "dig";
  95         }
  96
  97         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_address);
  98         hdr = &xsdt->header;
  99         if (strncmp(hdr->signature, XSDT_SIG, sizeof(XSDT_SIG) - 1)) {
 100                 printk(KERN_ERR
 101                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 102                 return "dig";
 103         }
 104
 105         if (!strcmp(hdr->oem_id, "HP")) {
 106                 return "hpzx1";
 107         } else if (!strcmp(hdr->oem_id, "SGI")) {
 108                 return "sn2";
 109         }
 110
 111         return "dig";
 112 #else
 113 # if defined (CONFIG_IA64_HP_SIM)
 114         return "hpsim";
 115 # elif defined (CONFIG_IA64_HP_ZX1)
 116         return "hpzx1";
 117 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
 118         return "hpzx1_swiotlb";
 119 # elif defined (CONFIG_IA64_SGI_SN2)
 120         return "sn2";
 121 # elif defined (CONFIG_IA64_DIG)
 122         return "dig";
 123 # else
 124 #       error Unknown platform.  Fix acpi.c.
 125 # endif
 126 #endif
 127 }
 128
 129 #ifdef CONFIG_ACPI
 130
 131 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 132
 133 /* Array to record platform interrupt vectors for generic interrupt routing. */
 134 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 135         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 136 };
 137
 138 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 139
 140 /*
 141  * Interrupt routing API for device drivers.  Provides interrupt vector for
 142  * a generic platform event.  Currently only CPEI is implemented.
 143  */
 144 int acpi_request_vector(u32 int_type)
 145 {
 146         int vector = -1;
 147
 148         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 149                 /* corrected platform error interrupt */
 150                 vector = platform_intr_list[int_type];
 151         } else
 152                 printk(KERN_ERR
 153                        "acpi_request_vector(): invalid interrupt type\n");
 154         return vector;
 155 }
 156
 157 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 158 {
 159         return __va(phys_addr);
 160 }
 161
 162 /* --------------------------------------------------------------------------
 163                             Boot-time Table Parsing
 164    -------------------------------------------------------------------------- */
 165
 166 static int total_cpus __initdata;
 167 static int available_cpus __initdata;
 168 struct acpi_table_madt *acpi_madt __initdata;
 169 static u8 has_8259;
 170
 171 static int __init
 172 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
 173                           const unsigned long end)
 174 {
 175         struct acpi_table_lapic_addr_ovr *lapic;
 176
 177         lapic = (struct acpi_table_lapic_addr_ovr *)header;
 178
 179         if (BAD_MADT_ENTRY(lapic, end))
 180                 return -EINVAL;
 181
 182         if (lapic->address) {
 183                 iounmap(ipi_base_addr);
 184                 ipi_base_addr = ioremap(lapic->address, 0);
 185         }
 186         return 0;
 187 }
 188
 189 static int __init
 190 acpi_parse_lsapic(acpi_table_entry_header * header, const unsigned long end)
 191 {
 192         struct acpi_table_lsapic *lsapic;
 193
 194         lsapic = (struct acpi_table_lsapic *)header;
 195
 196         if (BAD_MADT_ENTRY(lsapic, end))
 197                 return -EINVAL;
 198
 199         if (lsapic->flags.enabled) {
 200 #ifdef CONFIG_SMP
 201                 smp_boot_data.cpu_phys_id[available_cpus] =
 202                     (lsapic->id << 8) | lsapic->eid;
 203 #endif
 204                 ia64_acpiid_to_sapicid[lsapic->acpi_id] =
 205                     (lsapic->id << 8) | lsapic->eid;
 206                 ++available_cpus;
 207         }
 208
 209         total_cpus++;
 210         return 0;
 211 }
 212
 213 static int __init
 214 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
 215 {
 216         struct acpi_table_lapic_nmi *lacpi_nmi;
 217
 218         lacpi_nmi = (struct acpi_table_lapic_nmi *)header;
 219
 220         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 221                 return -EINVAL;
 222
 223         /* TBD: Support lapic_nmi entries */
 224         return 0;
 225 }
 226
 227 static int __init
 228 acpi_parse_iosapic(acpi_table_entry_header * header, const unsigned long end)
 229 {
 230         struct acpi_table_iosapic *iosapic;
 231
 232         iosapic = (struct acpi_table_iosapic *)header;
 233
 234         if (BAD_MADT_ENTRY(iosapic, end))
 235                 return -EINVAL;
 236
 237         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 238 }
 239
 240 static unsigned int __initdata acpi_madt_rev;
 241
 242 static int __init
 243 acpi_parse_plat_int_src(acpi_table_entry_header * header,
 244                         const unsigned long end)
 245 {
 246         struct acpi_table_plat_int_src *plintsrc;
 247         int vector;
 248
 249         plintsrc = (struct acpi_table_plat_int_src *)header;
 250
 251         if (BAD_MADT_ENTRY(plintsrc, end))
 252                 return -EINVAL;
 253
 254         /*
 255          * Get vector assignment for this interrupt, set attributes,
 256          * and program the IOSAPIC routing table.
 257          */
 258         vector = iosapic_register_platform_intr(plintsrc->type,
 259                                                 plintsrc->global_irq,
 260                                                 plintsrc->iosapic_vector,
 261                                                 plintsrc->eid,
 262                                                 plintsrc->id,
 263                                                 (plintsrc->flags.polarity ==
 264                                                  1) ? IOSAPIC_POL_HIGH :
 265                                                 IOSAPIC_POL_LOW,
 266                                                 (plintsrc->flags.trigger ==
 267                                                  1) ? IOSAPIC_EDGE :
 268                                                 IOSAPIC_LEVEL);
 269
 270         platform_intr_list[plintsrc->type] = vector;
 271         if (acpi_madt_rev > 1) {
 272                 acpi_cpei_override = plintsrc->plint_flags.cpei_override_flag;
 273         }
 274
 275         /*
 276          * Save the physical id, so we can check when its being removed
 277          */
 278         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 279
 280         return 0;
 281 }
 282
 283 #ifdef CONFIG_HOTPLUG_CPU
 284 unsigned int can_cpei_retarget(void)
 285 {
 286         extern int cpe_vector;
 287         extern unsigned int force_cpei_retarget;
 288
 289         /*
 290          * Only if CPEI is supported and the override flag
 291          * is present, otherwise return that its re-targettable
 292          * if we are in polling mode.
 293          */
 294         if (cpe_vector > 0) {
 295                 if (acpi_cpei_override || force_cpei_retarget)
 296                         return 1;
 297                 else
 298                         return 0;
 299         }
 300         return 1;
 301 }
 302
 303 unsigned int is_cpu_cpei_target(unsigned int cpu)
 304 {
 305         unsigned int logical_id;
 306
 307         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 308
 309         if (logical_id == cpu)
 310                 return 1;
 311         else
 312                 return 0;
 313 }
 314
 315 void set_cpei_target_cpu(unsigned int cpu)
 316 {
 317         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 318 }
 319 #endif
 320
 321 unsigned int get_cpei_target_cpu(void)
 322 {
 323         return acpi_cpei_phys_cpuid;
 324 }
 325
 326 static int __init
 327 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
 328                        const unsigned long end)
 329 {
 330         struct acpi_table_int_src_ovr *p;
 331
 332         p = (struct acpi_table_int_src_ovr *)header;
 333
 334         if (BAD_MADT_ENTRY(p, end))
 335                 return -EINVAL;
 336
 337         iosapic_override_isa_irq(p->bus_irq, p->global_irq,
 338                                  (p->flags.polarity ==
 339                                   1) ? IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 340                                  (p->flags.trigger ==
 341                                   1) ? IOSAPIC_EDGE : IOSAPIC_LEVEL);
 342         return 0;
 343 }
 344
 345 static int __init
 346 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
 347 {
 348         struct acpi_table_nmi_src *nmi_src;
 349
 350         nmi_src = (struct acpi_table_nmi_src *)header;
 351
 352         if (BAD_MADT_ENTRY(nmi_src, end))
 353                 return -EINVAL;
 354
 355         /* TBD: Support nimsrc entries */
 356         return 0;
 357 }
 358
 359 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 360 {
 361         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 362
 363                 /*
 364                  * Unfortunately ITC_DRIFT is not yet part of the
 365                  * official SAL spec, so the ITC_DRIFT bit is not
 366                  * set by the BIOS on this hardware.
 367                  */
 368                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 369
 370                 cyclone_setup();
 371         }
 372 }
 373
 374 static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
 375 {
 376         if (!phys_addr || !size)
 377                 return -EINVAL;
 378
 379         acpi_madt = (struct acpi_table_madt *)__va(phys_addr);
 380
 381         acpi_madt_rev = acpi_madt->header.revision;
 382
 383         /* remember the value for reference after free_initmem() */
 384 #ifdef CONFIG_ITANIUM
 385         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 386 #else
 387         has_8259 = acpi_madt->flags.pcat_compat;
 388 #endif
 389         iosapic_system_init(has_8259);
 390
 391         /* Get base address of IPI Message Block */
 392
 393         if (acpi_madt->lapic_address)
 394                 ipi_base_addr = ioremap(acpi_madt->lapic_address, 0);
 395
 396         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 397
 398         acpi_madt_oem_check(acpi_madt->header.oem_id,
 399                             acpi_madt->header.oem_table_id);
 400
 401         return 0;
 402 }
 403
 404 #ifdef CONFIG_ACPI_NUMA
 405
 406 #undef SLIT_DEBUG
 407
 408 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 409
 410 static int __initdata srat_num_cpus;    /* number of cpus */
 411 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
 412 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 413 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 414 static struct acpi_table_slit __initdata *slit_table;
 415
 416 static int get_processor_proximity_domain(struct acpi_table_processor_affinity *pa)
 417 {
 418         int pxm;
 419
 420         pxm = pa->proximity_domain;
 421         if (ia64_platform_is("sn2"))
 422                 pxm += pa->reserved[0] << 8;
 423         return pxm;
 424 }
 425
 426 static int get_memory_proximity_domain(struct acpi_table_memory_affinity *ma)
 427 {
 428         int pxm;
 429
 430         pxm = ma->proximity_domain;
 431         if (ia64_platform_is("sn2"))
 432                 pxm += ma->reserved1[0] << 8;
 433         return pxm;
 434 }
 435
 436 /*
 437  * ACPI 2.0 SLIT (System Locality Information Table)
 438  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 439  */
 440 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 441 {
 442         u32 len;
 443
 444         len = sizeof(struct acpi_table_header) + 8
 445             + slit->localities * slit->localities;
 446         if (slit->header.length != len) {
 447                 printk(KERN_ERR
 448                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 449                        len, slit->header.length);
 450                 memset(numa_slit, 10, sizeof(numa_slit));
 451                 return;
 452         }
 453         slit_table = slit;
 454 }
 455
 456 void __init
 457 acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity *pa)
 458 {
 459         int pxm;
 460
 461         if (!pa->flags.enabled)
 462                 return;
 463
 464         pxm = get_processor_proximity_domain(pa);
 465
 466         /* record this node in proximity bitmap */
 467         pxm_bit_set(pxm);
 468
 469         node_cpuid[srat_num_cpus].phys_id =
 470             (pa->apic_id << 8) | (pa->lsapic_eid);
 471         /* nid should be overridden as logical node id later */
 472         node_cpuid[srat_num_cpus].nid = pxm;
 473         srat_num_cpus++;
 474 }
 475
 476 void __init
 477 acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
 478 {
 479         unsigned long paddr, size;
 480         int pxm;
 481         struct node_memblk_s *p, *q, *pend;
 482
 483         pxm = get_memory_proximity_domain(ma);
 484
 485         /* fill node memory chunk structure */
 486         paddr = ma->base_addr_hi;
 487         paddr = (paddr << 32) | ma->base_addr_lo;
 488         size = ma->length_hi;
 489         size = (size << 32) | ma->length_lo;
 490
 491         /* Ignore disabled entries */
 492         if (!ma->flags.enabled)
 493                 return;
 494
 495         /* record this node in proximity bitmap */
 496         pxm_bit_set(pxm);
 497
 498         /* Insertion sort based on base address */
 499         pend = &node_memblk[num_node_memblks];
 500         for (p = &node_memblk[0]; p < pend; p++) {
 501                 if (paddr < p->start_paddr)
 502                         break;
 503         }
 504         if (p < pend) {
 505                 for (q = pend - 1; q >= p; q--)
 506                         *(q + 1) = *q;
 507         }
 508         p->start_paddr = paddr;
 509         p->size = size;
 510         p->nid = pxm;
 511         num_node_memblks++;
 512 }
 513
 514 void __init acpi_numa_arch_fixup(void)
 515 {
 516         int i, j, node_from, node_to;
 517
 518         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 519         if (srat_num_cpus == 0) {
 520                 node_set_online(0);
 521                 node_cpuid[0].phys_id = hard_smp_processor_id();
 522                 return;
 523         }
 524
 525         /*
 526          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 527          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 528          */
 529         nodes_clear(node_online_map);
 530         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 531                 if (pxm_bit_test(i)) {
 532                         int nid = acpi_map_pxm_to_node(i);
 533                         node_set_online(nid);
 534                 }
 535         }
 536
 537         /* set logical node id in memory chunk structure */
 538         for (i = 0; i < num_node_memblks; i++)
 539                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 540
 541         /* assign memory bank numbers for each chunk on each node */
 542         for_each_online_node(i) {
 543                 int bank;
 544
 545                 bank = 0;
 546                 for (j = 0; j < num_node_memblks; j++)
 547                         if (node_memblk[j].nid == i)
 548                                 node_memblk[j].bank = bank++;
 549         }
 550
 551         /* set logical node id in cpu structure */
 552         for (i = 0; i < srat_num_cpus; i++)
 553                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 554
 555         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 556                num_online_nodes());
 557         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 558                num_node_memblks);
 559
 560         if (!slit_table)
 561                 return;
 562         memset(numa_slit, -1, sizeof(numa_slit));
 563         for (i = 0; i < slit_table->localities; i++) {
 564                 if (!pxm_bit_test(i))
 565                         continue;
 566                 node_from = pxm_to_node(i);
 567                 for (j = 0; j < slit_table->localities; j++) {
 568                         if (!pxm_bit_test(j))
 569                                 continue;
 570                         node_to = pxm_to_node(j);
 571                         node_distance(node_from, node_to) =
 572                             slit_table->entry[i * slit_table->localities + j];
 573                 }
 574         }
 575
 576 #ifdef SLIT_DEBUG
 577         printk("ACPI 2.0 SLIT locality table:\n");
 578         for_each_online_node(i) {
 579                 for_each_online_node(j)
 580                     printk("%03d ", node_distance(i, j));
 581                 printk("\n");
 582         }
 583 #endif
 584 }
 585 #endif                          /* CONFIG_ACPI_NUMA */
 586
 587 /*
 588  * success: return IRQ number (>=0)
 589  * failure: return < 0
 590  */
 591 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 592 {
 593         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 594                 return gsi;
 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         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 613                 return;
 614
 615         iosapic_unregister_intr(gsi);
 616 }
 617
 618 EXPORT_SYMBOL(acpi_unregister_gsi);
 619
 620 static int __init acpi_parse_fadt(unsigned long phys_addr, unsigned long size)
 621 {
 622         struct acpi_table_header *fadt_header;
 623         struct fadt_descriptor *fadt;
 624
 625         if (!phys_addr || !size)
 626                 return -EINVAL;
 627
 628         fadt_header = (struct acpi_table_header *)__va(phys_addr);
 629         if (fadt_header->revision != 3)
 630                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 631
 632         fadt = (struct fadt_descriptor *)fadt_header;
 633
 634         acpi_register_gsi(fadt->sci_int, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
 635         return 0;
 636 }
 637
 638 unsigned long __init acpi_find_rsdp(void)
 639 {
 640         unsigned long rsdp_phys = 0;
 641
 642         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 643                 rsdp_phys = efi.acpi20;
 644         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 645                 printk(KERN_WARNING PREFIX
 646                        "v1.0/r0.71 tables no longer supported\n");
 647         return rsdp_phys;
 648 }
 649
 650 int __init acpi_boot_init(void)
 651 {
 652
 653         /*
 654          * MADT
 655          * ----
 656          * Parse the Multiple APIC Description Table (MADT), if exists.
 657          * Note that this table provides platform SMP configuration
 658          * information -- the successor to MPS tables.
 659          */
 660
 661         if (acpi_table_parse(ACPI_APIC, acpi_parse_madt) < 1) {
 662                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 663                 goto skip_madt;
 664         }
 665
 666         /* Local APIC */
 667
 668         if (acpi_table_parse_madt
 669             (ACPI_MADT_LAPIC_ADDR_OVR, acpi_parse_lapic_addr_ovr, 0) < 0)
 670                 printk(KERN_ERR PREFIX
 671                        "Error parsing LAPIC address override entry\n");
 672
 673         if (acpi_table_parse_madt(ACPI_MADT_LSAPIC, acpi_parse_lsapic, NR_CPUS)
 674             < 1)
 675                 printk(KERN_ERR PREFIX
 676                        "Error parsing MADT - no LAPIC entries\n");
 677
 678         if (acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0)
 679             < 0)
 680                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 681
 682         /* I/O APIC */
 683
 684         if (acpi_table_parse_madt
 685             (ACPI_MADT_IOSAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1)
 686                 printk(KERN_ERR PREFIX
 687                        "Error parsing MADT - no IOSAPIC entries\n");
 688
 689         /* System-Level Interrupt Routing */
 690
 691         if (acpi_table_parse_madt
 692             (ACPI_MADT_PLAT_INT_SRC, acpi_parse_plat_int_src,
 693              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 694                 printk(KERN_ERR PREFIX
 695                        "Error parsing platform interrupt source entry\n");
 696
 697         if (acpi_table_parse_madt
 698             (ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr, 0) < 0)
 699                 printk(KERN_ERR PREFIX
 700                        "Error parsing interrupt source overrides entry\n");
 701
 702         if (acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src, 0) < 0)
 703                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 704       skip_madt:
 705
 706         /*
 707          * FADT says whether a legacy keyboard controller is present.
 708          * The FADT also contains an SCI_INT line, by which the system
 709          * gets interrupts such as power and sleep buttons.  If it's not
 710          * on a Legacy interrupt, it needs to be setup.
 711          */
 712         if (acpi_table_parse(ACPI_FADT, acpi_parse_fadt) < 1)
 713                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 714
 715 #ifdef CONFIG_SMP
 716         if (available_cpus == 0) {
 717                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 718                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 719                 smp_boot_data.cpu_phys_id[available_cpus] =
 720                     hard_smp_processor_id();
 721                 available_cpus = 1;     /* We've got at least one of these, no? */
 722         }
 723         smp_boot_data.cpu_count = available_cpus;
 724
 725         smp_build_cpu_map();
 726 # ifdef CONFIG_ACPI_NUMA
 727         if (srat_num_cpus == 0) {
 728                 int cpu, i = 1;
 729                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 730                         if (smp_boot_data.cpu_phys_id[cpu] !=
 731                             hard_smp_processor_id())
 732                                 node_cpuid[i++].phys_id =
 733                                     smp_boot_data.cpu_phys_id[cpu];
 734         }
 735 # endif
 736 #endif
 737 #ifdef CONFIG_ACPI_NUMA
 738         build_cpu_to_node_map();
 739 #endif
 740         /* Make boot-up look pretty */
 741         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 742                total_cpus);
 743         return 0;
 744 }
 745
 746 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 747 {
 748         int vector;
 749
 750         if (has_8259 && gsi < 16)
 751                 *irq = isa_irq_to_vector(gsi);
 752         else {
 753                 vector = gsi_to_vector(gsi);
 754                 if (vector == -1)
 755                         return -1;
 756
 757                 *irq = vector;
 758         }
 759         return 0;
 760 }
 761
 762 /*
 763  *  ACPI based hotplug CPU support
 764  */
 765 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 766 static
 767 int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
 768 {
 769 #ifdef CONFIG_ACPI_NUMA
 770         int pxm_id;
 771         int nid;
 772
 773         pxm_id = acpi_get_pxm(handle);
 774         /*
 775          * We don't have cpu-only-node hotadd. But if the system equips
 776          * SRAT table, pxm is already found and node is ready.
 777          * So, just pxm_to_nid(pxm) is OK.
 778          * This code here is for the system which doesn't have full SRAT
 779          * table for possible cpus.
 780          */
 781         nid = acpi_map_pxm_to_node(pxm_id);
 782         node_cpuid[cpu].phys_id = physid;
 783         node_cpuid[cpu].nid = nid;
 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                 kfree(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                 kfree(buffer.pointer);
 868                 return -EINVAL;
 869         }
 870
 871         physid = ((lsapic->id << 8) | (lsapic->eid));
 872
 873         kfree(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                 kfree(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                 kfree(buffer.pointer);
 945                 return AE_OK;
 946         }
 947
 948         gsi_base = iosapic->global_irq_base;
 949
 950         kfree(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 */