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   1 /*
   2  *  acpi.c - Architecture-Specific Low-Level ACPI Support
   3  *
   4  *  Copyright (C) 1999 VA Linux Systems
   5  *  Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
   6  *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
   7  *      David Mosberger-Tang <davidm@hpl.hp.com>
   8  *  Copyright (C) 2000 Intel Corp.
   9  *  Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
  10  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  11  *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
  12  *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
  13  *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
  14  *  Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
  15  *
  16  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  17  *
  18  *  This program is free software; you can redistribute it and/or modify
  19  *  it under the terms of the GNU General Public License as published by
  20  *  the Free Software Foundation; either version 2 of the License, or
  21  *  (at your option) any later version.
  22  *
  23  *  This program is distributed in the hope that it will be useful,
  24  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *  GNU General Public License for more details.
  27  *
  28  *  You should have received a copy of the GNU General Public License
  29  *  along with this program; if not, write to the Free Software
  30  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  31  *
  32  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/kernel.h>
  38 #include <linux/sched.h>
  39 #include <linux/smp.h>
  40 #include <linux/string.h>
  41 #include <linux/types.h>
  42 #include <linux/irq.h>
  43 #include <linux/acpi.h>
  44 #include <linux/efi.h>
  45 #include <linux/mmzone.h>
  46 #include <linux/nodemask.h>
  47 #include <asm/io.h>
  48 #include <asm/iosapic.h>
  49 #include <asm/machvec.h>
  50 #include <asm/page.h>
  51 #include <asm/system.h>
  52 #include <asm/numa.h>
  53 #include <asm/sal.h>
  54 #include <asm/cyclone.h>
  55
  56 #define BAD_MADT_ENTRY(entry, end) (                                        \
  57                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  58                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
  59
  60 #define PREFIX                  "ACPI: "
  61
  62 void (*pm_idle) (void);
  63 EXPORT_SYMBOL(pm_idle);
  64 void (*pm_power_off) (void);
  65 EXPORT_SYMBOL(pm_power_off);
  66
  67 unsigned int acpi_cpei_override;
  68 unsigned int acpi_cpei_phys_cpuid;
  69
  70 unsigned long acpi_wakeup_address = 0;
  71
  72 #ifdef CONFIG_IA64_GENERIC
  73 static unsigned long __init acpi_find_rsdp(void)
  74 {
  75         unsigned long rsdp_phys = 0;
  76
  77         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
  78                 rsdp_phys = efi.acpi20;
  79         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
  80                 printk(KERN_WARNING PREFIX
  81                        "v1.0/r0.71 tables no longer supported\n");
  82         return rsdp_phys;
  83 }
  84 #endif
  85
  86 const char __init *
  87 acpi_get_sysname(void)
  88 {
  89 #ifdef CONFIG_IA64_GENERIC
  90         unsigned long rsdp_phys;
  91         struct acpi_table_rsdp *rsdp;
  92         struct acpi_table_xsdt *xsdt;
  93         struct acpi_table_header *hdr;
  94
  95         rsdp_phys = acpi_find_rsdp();
  96         if (!rsdp_phys) {
  97                 printk(KERN_ERR
  98                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  99                 return "dig";
 100         }
 101
 102         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
 103         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
 104                 printk(KERN_ERR
 105                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
 106                 return "dig";
 107         }
 108
 109         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
 110         hdr = &xsdt->header;
 111         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
 112                 printk(KERN_ERR
 113                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 114                 return "dig";
 115         }
 116
 117         if (!strcmp(hdr->oem_id, "HP")) {
 118                 return "hpzx1";
 119         } else if (!strcmp(hdr->oem_id, "SGI")) {
 120                 return "sn2";
 121         }
 122
 123         return "dig";
 124 #else
 125 # if defined (CONFIG_IA64_HP_SIM)
 126         return "hpsim";
 127 # elif defined (CONFIG_IA64_HP_ZX1)
 128         return "hpzx1";
 129 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
 130         return "hpzx1_swiotlb";
 131 # elif defined (CONFIG_IA64_SGI_SN2)
 132         return "sn2";
 133 # elif defined (CONFIG_IA64_DIG)
 134         return "dig";
 135 # else
 136 #       error Unknown platform.  Fix acpi.c.
 137 # endif
 138 #endif
 139 }
 140
 141 #ifdef CONFIG_ACPI
 142
 143 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 144
 145 /* Array to record platform interrupt vectors for generic interrupt routing. */
 146 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 147         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 148 };
 149
 150 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 151
 152 /*
 153  * Interrupt routing API for device drivers.  Provides interrupt vector for
 154  * a generic platform event.  Currently only CPEI is implemented.
 155  */
 156 int acpi_request_vector(u32 int_type)
 157 {
 158         int vector = -1;
 159
 160         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 161                 /* corrected platform error interrupt */
 162                 vector = platform_intr_list[int_type];
 163         } else
 164                 printk(KERN_ERR
 165                        "acpi_request_vector(): invalid interrupt type\n");
 166         return vector;
 167 }
 168
 169 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
 170 {
 171         return __va(phys_addr);
 172 }
 173
 174 /* --------------------------------------------------------------------------
 175                             Boot-time Table Parsing
 176    -------------------------------------------------------------------------- */
 177
 178 static int total_cpus __initdata;
 179 static int available_cpus __initdata;
 180 struct acpi_table_madt *acpi_madt __initdata;
 181 static u8 has_8259;
 182
 183 static int __init
 184 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 185                           const unsigned long end)
 186 {
 187         struct acpi_madt_local_apic_override *lapic;
 188
 189         lapic = (struct acpi_madt_local_apic_override *)header;
 190
 191         if (BAD_MADT_ENTRY(lapic, end))
 192                 return -EINVAL;
 193
 194         if (lapic->address) {
 195                 iounmap(ipi_base_addr);
 196                 ipi_base_addr = ioremap(lapic->address, 0);
 197         }
 198         return 0;
 199 }
 200
 201 static int __init
 202 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
 203 {
 204         struct acpi_madt_local_sapic *lsapic;
 205
 206         lsapic = (struct acpi_madt_local_sapic *)header;
 207
 208         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 209
 210         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 211 #ifdef CONFIG_SMP
 212                 smp_boot_data.cpu_phys_id[available_cpus] =
 213                     (lsapic->id << 8) | lsapic->eid;
 214 #endif
 215                 ++available_cpus;
 216         }
 217
 218         total_cpus++;
 219         return 0;
 220 }
 221
 222 static int __init
 223 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 224 {
 225         struct acpi_madt_local_apic_nmi *lacpi_nmi;
 226
 227         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 228
 229         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 230                 return -EINVAL;
 231
 232         /* TBD: Support lapic_nmi entries */
 233         return 0;
 234 }
 235
 236 static int __init
 237 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
 238 {
 239         struct acpi_madt_io_sapic *iosapic;
 240
 241         iosapic = (struct acpi_madt_io_sapic *)header;
 242
 243         if (BAD_MADT_ENTRY(iosapic, end))
 244                 return -EINVAL;
 245
 246         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 247 }
 248
 249 static unsigned int __initdata acpi_madt_rev;
 250
 251 static int __init
 252 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
 253                         const unsigned long end)
 254 {
 255         struct acpi_madt_interrupt_source *plintsrc;
 256         int vector;
 257
 258         plintsrc = (struct acpi_madt_interrupt_source *)header;
 259
 260         if (BAD_MADT_ENTRY(plintsrc, end))
 261                 return -EINVAL;
 262
 263         /*
 264          * Get vector assignment for this interrupt, set attributes,
 265          * and program the IOSAPIC routing table.
 266          */
 267         vector = iosapic_register_platform_intr(plintsrc->type,
 268                                                 plintsrc->global_irq,
 269                                                 plintsrc->io_sapic_vector,
 270                                                 plintsrc->eid,
 271                                                 plintsrc->id,
 272                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 273                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 274                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 275                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 276                                                  ACPI_MADT_TRIGGER_EDGE) ?
 277                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
 278
 279         platform_intr_list[plintsrc->type] = vector;
 280         if (acpi_madt_rev > 1) {
 281                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 282         }
 283
 284         /*
 285          * Save the physical id, so we can check when its being removed
 286          */
 287         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 288
 289         return 0;
 290 }
 291
 292 #ifdef CONFIG_HOTPLUG_CPU
 293 unsigned int can_cpei_retarget(void)
 294 {
 295         extern int cpe_vector;
 296         extern unsigned int force_cpei_retarget;
 297
 298         /*
 299          * Only if CPEI is supported and the override flag
 300          * is present, otherwise return that its re-targettable
 301          * if we are in polling mode.
 302          */
 303         if (cpe_vector > 0) {
 304                 if (acpi_cpei_override || force_cpei_retarget)
 305                         return 1;
 306                 else
 307                         return 0;
 308         }
 309         return 1;
 310 }
 311
 312 unsigned int is_cpu_cpei_target(unsigned int cpu)
 313 {
 314         unsigned int logical_id;
 315
 316         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 317
 318         if (logical_id == cpu)
 319                 return 1;
 320         else
 321                 return 0;
 322 }
 323
 324 void set_cpei_target_cpu(unsigned int cpu)
 325 {
 326         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 327 }
 328 #endif
 329
 330 unsigned int get_cpei_target_cpu(void)
 331 {
 332         return acpi_cpei_phys_cpuid;
 333 }
 334
 335 static int __init
 336 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 337                        const unsigned long end)
 338 {
 339         struct acpi_madt_interrupt_override *p;
 340
 341         p = (struct acpi_madt_interrupt_override *)header;
 342
 343         if (BAD_MADT_ENTRY(p, end))
 344                 return -EINVAL;
 345
 346         iosapic_override_isa_irq(p->source_irq, p->global_irq,
 347                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 348                                   ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 349                                  IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 350                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 351                                  ACPI_MADT_TRIGGER_EDGE) ?
 352                                  IOSAPIC_EDGE : IOSAPIC_LEVEL);
 353         return 0;
 354 }
 355
 356 static int __init
 357 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 358 {
 359         struct acpi_madt_nmi_source *nmi_src;
 360
 361         nmi_src = (struct acpi_madt_nmi_source *)header;
 362
 363         if (BAD_MADT_ENTRY(nmi_src, end))
 364                 return -EINVAL;
 365
 366         /* TBD: Support nimsrc entries */
 367         return 0;
 368 }
 369
 370 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 371 {
 372         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 373
 374                 /*
 375                  * Unfortunately ITC_DRIFT is not yet part of the
 376                  * official SAL spec, so the ITC_DRIFT bit is not
 377                  * set by the BIOS on this hardware.
 378                  */
 379                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 380
 381                 cyclone_setup();
 382         }
 383 }
 384
 385 static int __init acpi_parse_madt(struct acpi_table_header *table)
 386 {
 387         if (!table)
 388                 return -EINVAL;
 389
 390         acpi_madt = (struct acpi_table_madt *)table;
 391
 392         acpi_madt_rev = acpi_madt->header.revision;
 393
 394         /* remember the value for reference after free_initmem() */
 395 #ifdef CONFIG_ITANIUM
 396         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 397 #else
 398         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 399 #endif
 400         iosapic_system_init(has_8259);
 401
 402         /* Get base address of IPI Message Block */
 403
 404         if (acpi_madt->address)
 405                 ipi_base_addr = ioremap(acpi_madt->address, 0);
 406
 407         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 408
 409         acpi_madt_oem_check(acpi_madt->header.oem_id,
 410                             acpi_madt->header.oem_table_id);
 411
 412         return 0;
 413 }
 414
 415 #ifdef CONFIG_ACPI_NUMA
 416
 417 #undef SLIT_DEBUG
 418
 419 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 420
 421 static int __initdata srat_num_cpus;    /* number of cpus */
 422 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
 423 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 424 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 425 static struct acpi_table_slit __initdata *slit_table;
 426
 427 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 428 {
 429         int pxm;
 430
 431         pxm = pa->proximity_domain_lo;
 432         if (ia64_platform_is("sn2"))
 433                 pxm += pa->proximity_domain_hi[0] << 8;
 434         return pxm;
 435 }
 436
 437 static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 438 {
 439         int pxm;
 440
 441         pxm = ma->proximity_domain;
 442         if (!ia64_platform_is("sn2"))
 443                 pxm &= 0xff;
 444
 445         return pxm;
 446 }
 447
 448 /*
 449  * ACPI 2.0 SLIT (System Locality Information Table)
 450  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 451  */
 452 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 453 {
 454         u32 len;
 455
 456         len = sizeof(struct acpi_table_header) + 8
 457             + slit->locality_count * slit->locality_count;
 458         if (slit->header.length != len) {
 459                 printk(KERN_ERR
 460                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 461                        len, slit->header.length);
 462                 memset(numa_slit, 10, sizeof(numa_slit));
 463                 return;
 464         }
 465         slit_table = slit;
 466 }
 467
 468 void __init
 469 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 470 {
 471         int pxm;
 472
 473         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 474                 return;
 475
 476         pxm = get_processor_proximity_domain(pa);
 477
 478         /* record this node in proximity bitmap */
 479         pxm_bit_set(pxm);
 480
 481         node_cpuid[srat_num_cpus].phys_id =
 482             (pa->apic_id << 8) | (pa->local_sapic_eid);
 483         /* nid should be overridden as logical node id later */
 484         node_cpuid[srat_num_cpus].nid = pxm;
 485         srat_num_cpus++;
 486 }
 487
 488 void __init
 489 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 490 {
 491         unsigned long paddr, size;
 492         int pxm;
 493         struct node_memblk_s *p, *q, *pend;
 494
 495         pxm = get_memory_proximity_domain(ma);
 496
 497         /* fill node memory chunk structure */
 498         paddr = ma->base_address;
 499         size = ma->length;
 500
 501         /* Ignore disabled entries */
 502         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 503                 return;
 504
 505         /* record this node in proximity bitmap */
 506         pxm_bit_set(pxm);
 507
 508         /* Insertion sort based on base address */
 509         pend = &node_memblk[num_node_memblks];
 510         for (p = &node_memblk[0]; p < pend; p++) {
 511                 if (paddr < p->start_paddr)
 512                         break;
 513         }
 514         if (p < pend) {
 515                 for (q = pend - 1; q >= p; q--)
 516                         *(q + 1) = *q;
 517         }
 518         p->start_paddr = paddr;
 519         p->size = size;
 520         p->nid = pxm;
 521         num_node_memblks++;
 522 }
 523
 524 void __init acpi_numa_arch_fixup(void)
 525 {
 526         int i, j, node_from, node_to;
 527
 528         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 529         if (srat_num_cpus == 0) {
 530                 node_set_online(0);
 531                 node_cpuid[0].phys_id = hard_smp_processor_id();
 532                 return;
 533         }
 534
 535         /*
 536          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 537          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 538          */
 539         nodes_clear(node_online_map);
 540         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 541                 if (pxm_bit_test(i)) {
 542                         int nid = acpi_map_pxm_to_node(i);
 543                         node_set_online(nid);
 544                 }
 545         }
 546
 547         /* set logical node id in memory chunk structure */
 548         for (i = 0; i < num_node_memblks; i++)
 549                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 550
 551         /* assign memory bank numbers for each chunk on each node */
 552         for_each_online_node(i) {
 553                 int bank;
 554
 555                 bank = 0;
 556                 for (j = 0; j < num_node_memblks; j++)
 557                         if (node_memblk[j].nid == i)
 558                                 node_memblk[j].bank = bank++;
 559         }
 560
 561         /* set logical node id in cpu structure */
 562         for (i = 0; i < srat_num_cpus; i++)
 563                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 564
 565         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 566                num_online_nodes());
 567         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 568                num_node_memblks);
 569
 570         if (!slit_table)
 571                 return;
 572         memset(numa_slit, -1, sizeof(numa_slit));
 573         for (i = 0; i < slit_table->locality_count; i++) {
 574                 if (!pxm_bit_test(i))
 575                         continue;
 576                 node_from = pxm_to_node(i);
 577                 for (j = 0; j < slit_table->locality_count; j++) {
 578                         if (!pxm_bit_test(j))
 579                                 continue;
 580                         node_to = pxm_to_node(j);
 581                         node_distance(node_from, node_to) =
 582                             slit_table->entry[i * slit_table->locality_count + j];
 583                 }
 584         }
 585
 586 #ifdef SLIT_DEBUG
 587         printk("ACPI 2.0 SLIT locality table:\n");
 588         for_each_online_node(i) {
 589                 for_each_online_node(j)
 590                     printk("%03d ", node_distance(i, j));
 591                 printk("\n");
 592         }
 593 #endif
 594 }
 595 #endif                          /* CONFIG_ACPI_NUMA */
 596
 597 /*
 598  * success: return IRQ number (>=0)
 599  * failure: return < 0
 600  */
 601 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 602 {
 603         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 604                 return gsi;
 605
 606         if (has_8259 && gsi < 16)
 607                 return isa_irq_to_vector(gsi);
 608
 609         return iosapic_register_intr(gsi,
 610                                      (polarity ==
 611                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 612                                      IOSAPIC_POL_LOW,
 613                                      (triggering ==
 614                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 615                                      IOSAPIC_LEVEL);
 616 }
 617
 618 void acpi_unregister_gsi(u32 gsi)
 619 {
 620         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 621                 return;
 622
 623         iosapic_unregister_intr(gsi);
 624 }
 625
 626 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 627 {
 628         struct acpi_table_header *fadt_header;
 629         struct acpi_table_fadt *fadt;
 630
 631         if (!table)
 632                 return -EINVAL;
 633
 634         fadt_header = (struct acpi_table_header *)table;
 635         if (fadt_header->revision != 3)
 636                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 637
 638         fadt = (struct acpi_table_fadt *)fadt_header;
 639
 640         acpi_register_gsi(fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
 641         return 0;
 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                 if (!ia64_platform_is("sn2"))
 681                         printk(KERN_ERR PREFIX
 682                                "Error parsing MADT - no IOSAPIC entries\n");
 683         }
 684
 685         /* System-Level Interrupt Routing */
 686
 687         if (acpi_table_parse_madt
 688             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
 689              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 690                 printk(KERN_ERR PREFIX
 691                        "Error parsing platform interrupt source entry\n");
 692
 693         if (acpi_table_parse_madt
 694             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
 695                 printk(KERN_ERR PREFIX
 696                        "Error parsing interrupt source overrides entry\n");
 697
 698         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
 699                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 700       skip_madt:
 701
 702         /*
 703          * FADT says whether a legacy keyboard controller is present.
 704          * The FADT also contains an SCI_INT line, by which the system
 705          * gets interrupts such as power and sleep buttons.  If it's not
 706          * on a Legacy interrupt, it needs to be setup.
 707          */
 708         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
 709                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 710
 711 #ifdef CONFIG_SMP
 712         if (available_cpus == 0) {
 713                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 714                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 715                 smp_boot_data.cpu_phys_id[available_cpus] =
 716                     hard_smp_processor_id();
 717                 available_cpus = 1;     /* We've got at least one of these, no? */
 718         }
 719         smp_boot_data.cpu_count = available_cpus;
 720
 721         smp_build_cpu_map();
 722 # ifdef CONFIG_ACPI_NUMA
 723         if (srat_num_cpus == 0) {
 724                 int cpu, i = 1;
 725                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 726                         if (smp_boot_data.cpu_phys_id[cpu] !=
 727                             hard_smp_processor_id())
 728                                 node_cpuid[i++].phys_id =
 729                                     smp_boot_data.cpu_phys_id[cpu];
 730         }
 731 # endif
 732 #endif
 733 #ifdef CONFIG_ACPI_NUMA
 734         build_cpu_to_node_map();
 735 #endif
 736         /* Make boot-up look pretty */
 737         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 738                total_cpus);
 739         return 0;
 740 }
 741
 742 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 743 {
 744         int tmp;
 745
 746         if (has_8259 && gsi < 16)
 747                 *irq = isa_irq_to_vector(gsi);
 748         else {
 749                 tmp = gsi_to_irq(gsi);
 750                 if (tmp == -1)
 751                         return -1;
 752                 *irq = tmp;
 753         }
 754         return 0;
 755 }
 756
 757 /*
 758  *  ACPI based hotplug CPU support
 759  */
 760 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 761 static
 762 int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
 763 {
 764 #ifdef CONFIG_ACPI_NUMA
 765         int pxm_id;
 766         int nid;
 767
 768         pxm_id = acpi_get_pxm(handle);
 769         /*
 770          * We don't have cpu-only-node hotadd. But if the system equips
 771          * SRAT table, pxm is already found and node is ready.
 772          * So, just pxm_to_nid(pxm) is OK.
 773          * This code here is for the system which doesn't have full SRAT
 774          * table for possible cpus.
 775          */
 776         nid = acpi_map_pxm_to_node(pxm_id);
 777         node_cpuid[cpu].phys_id = physid;
 778         node_cpuid[cpu].nid = nid;
 779 #endif
 780         return (0);
 781 }
 782
 783 int additional_cpus __initdata = -1;
 784
 785 static __init int setup_additional_cpus(char *s)
 786 {
 787         if (s)
 788                 additional_cpus = simple_strtol(s, NULL, 0);
 789
 790         return 0;
 791 }
 792
 793 early_param("additional_cpus", setup_additional_cpus);
 794
 795 /*
 796  * cpu_possible_map should be static, it cannot change as CPUs
 797  * are onlined, or offlined. The reason is per-cpu data-structures
 798  * are allocated by some modules at init time, and dont expect to
 799  * do this dynamically on cpu arrival/departure.
 800  * cpu_present_map on the other hand can change dynamically.
 801  * In case when cpu_hotplug is not compiled, then we resort to current
 802  * behaviour, which is cpu_possible == cpu_present.
 803  * - Ashok Raj
 804  *
 805  * Three ways to find out the number of additional hotplug CPUs:
 806  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 807  * - The user can overwrite it with additional_cpus=NUM
 808  * - Otherwise don't reserve additional CPUs.
 809  */
 810 __init void prefill_possible_map(void)
 811 {
 812         int i;
 813         int possible, disabled_cpus;
 814
 815         disabled_cpus = total_cpus - available_cpus;
 816
 817         if (additional_cpus == -1) {
 818                 if (disabled_cpus > 0)
 819                         additional_cpus = disabled_cpus;
 820                 else
 821                         additional_cpus = 0;
 822         }
 823
 824         possible = available_cpus + additional_cpus;
 825
 826         if (possible > NR_CPUS)
 827                 possible = NR_CPUS;
 828
 829         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 830                 possible, max((possible - available_cpus), 0));
 831
 832         for (i = 0; i < possible; i++)
 833                 cpu_set(i, cpu_possible_map);
 834 }
 835
 836 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 837 {
 838         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 839         union acpi_object *obj;
 840         struct acpi_madt_local_sapic *lsapic;
 841         cpumask_t tmp_map;
 842         long physid;
 843         int cpu;
 844
 845         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 846                 return -EINVAL;
 847
 848         if (!buffer.length || !buffer.pointer)
 849                 return -EINVAL;
 850
 851         obj = buffer.pointer;
 852         if (obj->type != ACPI_TYPE_BUFFER)
 853         {
 854                 kfree(buffer.pointer);
 855                 return -EINVAL;
 856         }
 857
 858         lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
 859
 860         if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
 861             (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
 862                 kfree(buffer.pointer);
 863                 return -EINVAL;
 864         }
 865
 866         physid = ((lsapic->id << 8) | (lsapic->eid));
 867
 868         kfree(buffer.pointer);
 869         buffer.length = ACPI_ALLOCATE_BUFFER;
 870         buffer.pointer = NULL;
 871
 872         cpus_complement(tmp_map, cpu_present_map);
 873         cpu = first_cpu(tmp_map);
 874         if (cpu >= NR_CPUS)
 875                 return -EINVAL;
 876
 877         acpi_map_cpu2node(handle, cpu, physid);
 878
 879         cpu_set(cpu, cpu_present_map);
 880         ia64_cpu_to_sapicid[cpu] = physid;
 881
 882         *pcpu = cpu;
 883         return (0);
 884 }
 885
 886 EXPORT_SYMBOL(acpi_map_lsapic);
 887
 888 int acpi_unmap_lsapic(int cpu)
 889 {
 890         ia64_cpu_to_sapicid[cpu] = -1;
 891         cpu_clear(cpu, cpu_present_map);
 892
 893 #ifdef CONFIG_ACPI_NUMA
 894         /* NUMA specific cleanup's */
 895 #endif
 896
 897         return (0);
 898 }
 899
 900 EXPORT_SYMBOL(acpi_unmap_lsapic);
 901 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 902
 903 #ifdef CONFIG_ACPI_NUMA
 904 static acpi_status __devinit
 905 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
 906 {
 907         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 908         union acpi_object *obj;
 909         struct acpi_madt_io_sapic *iosapic;
 910         unsigned int gsi_base;
 911         int pxm, node;
 912
 913         /* Only care about objects w/ a method that returns the MADT */
 914         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 915                 return AE_OK;
 916
 917         if (!buffer.length || !buffer.pointer)
 918                 return AE_OK;
 919
 920         obj = buffer.pointer;
 921         if (obj->type != ACPI_TYPE_BUFFER ||
 922             obj->buffer.length < sizeof(*iosapic)) {
 923                 kfree(buffer.pointer);
 924                 return AE_OK;
 925         }
 926
 927         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 928
 929         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 930                 kfree(buffer.pointer);
 931                 return AE_OK;
 932         }
 933
 934         gsi_base = iosapic->global_irq_base;
 935
 936         kfree(buffer.pointer);
 937
 938         /*
 939          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
 940          * us which node to associate this with.
 941          */
 942         pxm = acpi_get_pxm(handle);
 943         if (pxm < 0)
 944                 return AE_OK;
 945
 946         node = pxm_to_node(pxm);
 947
 948         if (node >= MAX_NUMNODES || !node_online(node) ||
 949             cpus_empty(node_to_cpumask(node)))
 950                 return AE_OK;
 951
 952         /* We know a gsi to node mapping! */
 953         map_iosapic_to_node(gsi_base, node);
 954         return AE_OK;
 955 }
 956
 957 static int __init
 958 acpi_map_iosapics (void)
 959 {
 960         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
 961         return 0;
 962 }
 963
 964 fs_initcall(acpi_map_iosapics);
 965 #endif                          /* CONFIG_ACPI_NUMA */
 966
 967 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 968 {
 969         int err;
 970
 971         if ((err = iosapic_init(phys_addr, gsi_base)))
 972                 return err;
 973
 974 #ifdef CONFIG_ACPI_NUMA
 975         acpi_map_iosapic(handle, 0, NULL, NULL);
 976 #endif                          /* CONFIG_ACPI_NUMA */
 977
 978         return 0;
 979 }
 980
 981 EXPORT_SYMBOL(acpi_register_ioapic);
 982
 983 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 984 {
 985         return iosapic_remove(gsi_base);
 986 }
 987
 988 EXPORT_SYMBOL(acpi_unregister_ioapic);
 989
 990 /*
 991  * acpi_save_state_mem() - save kernel state
 992  *
 993  * TBD when when IA64 starts to support suspend...
 994  */
 995 int acpi_save_state_mem(void) { return 0; }
 996
 997 /*
 998  * acpi_restore_state()
 999  */
1000 void acpi_restore_state_mem(void) {}
1001
1002 /*
1003  * do_suspend_lowlevel()
1004  */
1005 void do_suspend_lowlevel(void) {}
1006
1007 #endif                          /* CONFIG_ACPI */