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