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