arch/ia64/kernel/acpi.c

   1 /*
   2  *  acpi.c - Architecture-Specific Low-Level ACPI Support
   3  *
   4  *  Copyright (C) 1999 VA Linux Systems
   5  *  Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
   6  *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
   7  *      David Mosberger-Tang <davidm@hpl.hp.com>
   8  *  Copyright (C) 2000 Intel Corp.
   9  *  Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
  10  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  11  *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
  12  *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
  13  *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
  14  *  Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
  15  *
  16  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  17  *
  18  *  This program is free software; you can redistribute it and/or modify
  19  *  it under the terms of the GNU General Public License as published by
  20  *  the Free Software Foundation; either version 2 of the License, or
  21  *  (at your option) any later version.
  22  *
  23  *  This program is distributed in the hope that it will be useful,
  24  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *  GNU General Public License for more details.
  27  *
  28  *  You should have received a copy of the GNU General Public License
  29  *  along with this program; if not, write to the Free Software
  30  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  31  *
  32  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  33  */
  34
  35 #include <linux/config.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/kernel.h>
  39 #include <linux/sched.h>
  40 #include <linux/smp.h>
  41 #include <linux/string.h>
  42 #include <linux/types.h>
  43 #include <linux/irq.h>
  44 #include <linux/acpi.h>
  45 #include <linux/efi.h>
  46 #include <linux/mmzone.h>
  47 #include <linux/nodemask.h>
  48 #include <asm/io.h>
  49 #include <asm/iosapic.h>
  50 #include <asm/machvec.h>
  51 #include <asm/page.h>
  52 #include <asm/system.h>
  53 #include <asm/numa.h>
  54 #include <asm/sal.h>
  55 #include <asm/cyclone.h>
  56
  57 #define BAD_MADT_ENTRY(entry, end) (                                        \
  58                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  59                 ((acpi_table_entry_header *)entry)->length != sizeof(*entry))
  60
  61 #define PREFIX                  "ACPI: "
  62
  63 void (*pm_idle) (void);
  64 EXPORT_SYMBOL(pm_idle);
  65 void (*pm_power_off) (void);
  66 EXPORT_SYMBOL(pm_power_off);
  67
  68 unsigned char acpi_kbd_controller_present = 1;
  69 unsigned char acpi_legacy_devices;
  70
  71 static unsigned int __initdata acpi_madt_rev;
  72
  73 unsigned int acpi_cpei_override;
  74 unsigned int acpi_cpei_phys_cpuid;
  75
  76 #define MAX_SAPICS 256
  77 u16 ia64_acpiid_to_sapicid[MAX_SAPICS] = {[0 ... MAX_SAPICS - 1] = -1 };
  78
  79 EXPORT_SYMBOL(ia64_acpiid_to_sapicid);
  80
  81 const char *acpi_get_sysname(void)
  82 {
  83 #ifdef CONFIG_IA64_GENERIC
  84         unsigned long rsdp_phys;
  85         struct acpi20_table_rsdp *rsdp;
  86         struct acpi_table_xsdt *xsdt;
  87         struct acpi_table_header *hdr;
  88
  89         rsdp_phys = acpi_find_rsdp();
  90         if (!rsdp_phys) {
  91                 printk(KERN_ERR
  92                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  93                 return "dig";
  94         }
  95
  96         rsdp = (struct acpi20_table_rsdp *)__va(rsdp_phys);
  97         if (strncmp(rsdp->signature, RSDP_SIG, sizeof(RSDP_SIG) - 1)) {
  98                 printk(KERN_ERR
  99                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
 100                 return "dig";
 101         }
 102
 103         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_address);
 104         hdr = &xsdt->header;
 105         if (strncmp(hdr->signature, XSDT_SIG, sizeof(XSDT_SIG) - 1)) {
 106                 printk(KERN_ERR
 107                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 108                 return "dig";
 109         }
 110
 111         if (!strcmp(hdr->oem_id, "HP")) {
 112                 return "hpzx1";
 113         } else if (!strcmp(hdr->oem_id, "SGI")) {
 114                 return "sn2";
 115         }
 116
 117         return "dig";
 118 #else
 119 # if defined (CONFIG_IA64_HP_SIM)
 120         return "hpsim";
 121 # elif defined (CONFIG_IA64_HP_ZX1)
 122         return "hpzx1";
 123 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
 124         return "hpzx1_swiotlb";
 125 # elif defined (CONFIG_IA64_SGI_SN2)
 126         return "sn2";
 127 # elif defined (CONFIG_IA64_DIG)
 128         return "dig";
 129 # else
 130 #       error Unknown platform.  Fix acpi.c.
 131 # endif
 132 #endif
 133 }
 134
 135 #ifdef CONFIG_ACPI
 136
 137 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 138
 139 /* Array to record platform interrupt vectors for generic interrupt routing. */
 140 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 141         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 142 };
 143
 144 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 145
 146 /*
 147  * Interrupt routing API for device drivers.  Provides interrupt vector for
 148  * a generic platform event.  Currently only CPEI is implemented.
 149  */
 150 int acpi_request_vector(u32 int_type)
 151 {
 152         int vector = -1;
 153
 154         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 155                 /* corrected platform error interrupt */
 156                 vector = platform_intr_list[int_type];
 157         } else
 158                 printk(KERN_ERR
 159                        "acpi_request_vector(): invalid interrupt type\n");
 160         return vector;
 161 }
 162
 163 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 164 {
 165         return __va(phys_addr);
 166 }
 167
 168 /* --------------------------------------------------------------------------
 169                             Boot-time Table Parsing
 170    -------------------------------------------------------------------------- */
 171
 172 static int total_cpus __initdata;
 173 static int available_cpus __initdata;
 174 struct acpi_table_madt *acpi_madt __initdata;
 175 static u8 has_8259;
 176
 177 static int __init
 178 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
 179                           const unsigned long end)
 180 {
 181         struct acpi_table_lapic_addr_ovr *lapic;
 182
 183         lapic = (struct acpi_table_lapic_addr_ovr *)header;
 184
 185         if (BAD_MADT_ENTRY(lapic, end))
 186                 return -EINVAL;
 187
 188         if (lapic->address) {
 189                 iounmap(ipi_base_addr);
 190                 ipi_base_addr = ioremap(lapic->address, 0);
 191         }
 192         return 0;
 193 }
 194
 195 static int __init
 196 acpi_parse_lsapic(acpi_table_entry_header * header, const unsigned long end)
 197 {
 198         struct acpi_table_lsapic *lsapic;
 199
 200         lsapic = (struct acpi_table_lsapic *)header;
 201
 202         if (BAD_MADT_ENTRY(lsapic, end))
 203                 return -EINVAL;
 204
 205         if (lsapic->flags.enabled) {
 206 #ifdef CONFIG_SMP
 207                 smp_boot_data.cpu_phys_id[available_cpus] =
 208                     (lsapic->id << 8) | lsapic->eid;
 209 #endif
 210                 ia64_acpiid_to_sapicid[lsapic->acpi_id] =
 211                     (lsapic->id << 8) | lsapic->eid;
 212                 ++available_cpus;
 213         }
 214
 215         total_cpus++;
 216         return 0;
 217 }
 218
 219 static int __init
 220 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
 221 {
 222         struct acpi_table_lapic_nmi *lacpi_nmi;
 223
 224         lacpi_nmi = (struct acpi_table_lapic_nmi *)header;
 225
 226         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 227                 return -EINVAL;
 228
 229         /* TBD: Support lapic_nmi entries */
 230         return 0;
 231 }
 232
 233 static int __init
 234 acpi_parse_iosapic(acpi_table_entry_header * header, const unsigned long end)
 235 {
 236         struct acpi_table_iosapic *iosapic;
 237
 238         iosapic = (struct acpi_table_iosapic *)header;
 239
 240         if (BAD_MADT_ENTRY(iosapic, end))
 241                 return -EINVAL;
 242
 243         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 244 }
 245
 246 static int __init
 247 acpi_parse_plat_int_src(acpi_table_entry_header * header,
 248                         const unsigned long end)
 249 {
 250         struct acpi_table_plat_int_src *plintsrc;
 251         int vector;
 252
 253         plintsrc = (struct acpi_table_plat_int_src *)header;
 254
 255         if (BAD_MADT_ENTRY(plintsrc, end))
 256                 return -EINVAL;
 257
 258         /*
 259          * Get vector assignment for this interrupt, set attributes,
 260          * and program the IOSAPIC routing table.
 261          */
 262         vector = iosapic_register_platform_intr(plintsrc->type,
 263                                                 plintsrc->global_irq,
 264                                                 plintsrc->iosapic_vector,
 265                                                 plintsrc->eid,
 266                                                 plintsrc->id,
 267                                                 (plintsrc->flags.polarity ==
 268                                                  1) ? IOSAPIC_POL_HIGH :
 269                                                 IOSAPIC_POL_LOW,
 270                                                 (plintsrc->flags.trigger ==
 271                                                  1) ? IOSAPIC_EDGE :
 272                                                 IOSAPIC_LEVEL);
 273
 274         platform_intr_list[plintsrc->type] = vector;
 275         if (acpi_madt_rev > 1) {
 276                 acpi_cpei_override = plintsrc->plint_flags.cpei_override_flag;
 277         }
 278
 279         /*
 280          * Save the physical id, so we can check when its being removed
 281          */
 282         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 283
 284         return 0;
 285 }
 286
 287 #ifdef CONFIG_HOTPLUG_CPU
 288 unsigned int can_cpei_retarget(void)
 289 {
 290         extern int cpe_vector;
 291         extern unsigned int force_cpei_retarget;
 292
 293         /*
 294          * Only if CPEI is supported and the override flag
 295          * is present, otherwise return that its re-targettable
 296          * if we are in polling mode.
 297          */
 298         if (cpe_vector > 0) {
 299                 if (acpi_cpei_override || force_cpei_retarget)
 300                         return 1;
 301                 else
 302                         return 0;
 303         }
 304         return 1;
 305 }
 306
 307 unsigned int is_cpu_cpei_target(unsigned int cpu)
 308 {
 309         unsigned int logical_id;
 310
 311         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 312
 313         if (logical_id == cpu)
 314                 return 1;
 315         else
 316                 return 0;
 317 }
 318
 319 void set_cpei_target_cpu(unsigned int cpu)
 320 {
 321         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 322 }
 323 #endif
 324
 325 unsigned int get_cpei_target_cpu(void)
 326 {
 327         return acpi_cpei_phys_cpuid;
 328 }
 329
 330 static int __init
 331 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
 332                        const unsigned long end)
 333 {
 334         struct acpi_table_int_src_ovr *p;
 335
 336         p = (struct acpi_table_int_src_ovr *)header;
 337
 338         if (BAD_MADT_ENTRY(p, end))
 339                 return -EINVAL;
 340
 341         iosapic_override_isa_irq(p->bus_irq, p->global_irq,
 342                                  (p->flags.polarity ==
 343                                   1) ? IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 344                                  (p->flags.trigger ==
 345                                   1) ? IOSAPIC_EDGE : IOSAPIC_LEVEL);
 346         return 0;
 347 }
 348
 349 static int __init
 350 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
 351 {
 352         struct acpi_table_nmi_src *nmi_src;
 353
 354         nmi_src = (struct acpi_table_nmi_src *)header;
 355
 356         if (BAD_MADT_ENTRY(nmi_src, end))
 357                 return -EINVAL;
 358
 359         /* TBD: Support nimsrc entries */
 360         return 0;
 361 }
 362
 363 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 364 {
 365         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 366
 367                 /*
 368                  * Unfortunately ITC_DRIFT is not yet part of the
 369                  * official SAL spec, so the ITC_DRIFT bit is not
 370                  * set by the BIOS on this hardware.
 371                  */
 372                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 373
 374                 cyclone_setup();
 375         }
 376 }
 377
 378 static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
 379 {
 380         if (!phys_addr || !size)
 381                 return -EINVAL;
 382
 383         acpi_madt = (struct acpi_table_madt *)__va(phys_addr);
 384
 385         acpi_madt_rev = acpi_madt->header.revision;
 386
 387         /* remember the value for reference after free_initmem() */
 388 #ifdef CONFIG_ITANIUM
 389         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 390 #else
 391         has_8259 = acpi_madt->flags.pcat_compat;
 392 #endif
 393         iosapic_system_init(has_8259);
 394
 395         /* Get base address of IPI Message Block */
 396
 397         if (acpi_madt->lapic_address)
 398                 ipi_base_addr = ioremap(acpi_madt->lapic_address, 0);
 399
 400         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 401
 402         acpi_madt_oem_check(acpi_madt->header.oem_id,
 403                             acpi_madt->header.oem_table_id);
 404
 405         return 0;
 406 }
 407
 408 #ifdef CONFIG_ACPI_NUMA
 409
 410 #undef SLIT_DEBUG
 411
 412 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 413
 414 static int __initdata srat_num_cpus;    /* number of cpus */
 415 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
 416 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 417 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 418 /* maps to convert between proximity domain and logical node ID */
 419 int __devinitdata pxm_to_nid_map[MAX_PXM_DOMAINS];
 420 int __initdata nid_to_pxm_map[MAX_NUMNODES];
 421 static struct acpi_table_slit __initdata *slit_table;
 422
 423 /*
 424  * ACPI 2.0 SLIT (System Locality Information Table)
 425  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 426  */
 427 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 428 {
 429         u32 len;
 430
 431         len = sizeof(struct acpi_table_header) + 8
 432             + slit->localities * slit->localities;
 433         if (slit->header.length != len) {
 434                 printk(KERN_ERR
 435                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 436                        len, slit->header.length);
 437                 memset(numa_slit, 10, sizeof(numa_slit));
 438                 return;
 439         }
 440         slit_table = slit;
 441 }
 442
 443 void __init
 444 acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity *pa)
 445 {
 446         if (!pa->flags.enabled)
 447                 return;
 448
 449         /* record this node in proximity bitmap */
 450         pxm_bit_set(pa->proximity_domain);
 451
 452         node_cpuid[srat_num_cpus].phys_id =
 453             (pa->apic_id << 8) | (pa->lsapic_eid);
 454         /* nid should be overridden as logical node id later */
 455         node_cpuid[srat_num_cpus].nid = pa->proximity_domain;
 456         srat_num_cpus++;
 457 }
 458
 459 void __init
 460 acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
 461 {
 462         unsigned long paddr, size;
 463         u8 pxm;
 464         struct node_memblk_s *p, *q, *pend;
 465
 466         pxm = ma->proximity_domain;
 467
 468         /* fill node memory chunk structure */
 469         paddr = ma->base_addr_hi;
 470         paddr = (paddr << 32) | ma->base_addr_lo;
 471         size = ma->length_hi;
 472         size = (size << 32) | ma->length_lo;
 473
 474         /* Ignore disabled entries */
 475         if (!ma->flags.enabled)
 476                 return;
 477
 478         /* record this node in proximity bitmap */
 479         pxm_bit_set(pxm);
 480
 481         /* Insertion sort based on base address */
 482         pend = &node_memblk[num_node_memblks];
 483         for (p = &node_memblk[0]; p < pend; p++) {
 484                 if (paddr < p->start_paddr)
 485                         break;
 486         }
 487         if (p < pend) {
 488                 for (q = pend - 1; q >= p; q--)
 489                         *(q + 1) = *q;
 490         }
 491         p->start_paddr = paddr;
 492         p->size = size;
 493         p->nid = pxm;
 494         num_node_memblks++;
 495 }
 496
 497 void __init acpi_numa_arch_fixup(void)
 498 {
 499         int i, j, node_from, node_to;
 500
 501         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 502         if (srat_num_cpus == 0) {
 503                 node_set_online(0);
 504                 node_cpuid[0].phys_id = hard_smp_processor_id();
 505                 return;
 506         }
 507
 508         /*
 509          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 510          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 511          */
 512         /* calculate total number of nodes in system from PXM bitmap */
 513         memset(pxm_to_nid_map, -1, sizeof(pxm_to_nid_map));
 514         memset(nid_to_pxm_map, -1, sizeof(nid_to_pxm_map));
 515         nodes_clear(node_online_map);
 516         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 517                 if (pxm_bit_test(i)) {
 518                         int nid = num_online_nodes();
 519                         pxm_to_nid_map[i] = nid;
 520                         nid_to_pxm_map[nid] = i;
 521                         node_set_online(nid);
 522                 }
 523         }
 524
 525         /* set logical node id in memory chunk structure */
 526         for (i = 0; i < num_node_memblks; i++)
 527                 node_memblk[i].nid = pxm_to_nid_map[node_memblk[i].nid];
 528
 529         /* assign memory bank numbers for each chunk on each node */
 530         for_each_online_node(i) {
 531                 int bank;
 532
 533                 bank = 0;
 534                 for (j = 0; j < num_node_memblks; j++)
 535                         if (node_memblk[j].nid == i)
 536                                 node_memblk[j].bank = bank++;
 537         }
 538
 539         /* set logical node id in cpu structure */
 540         for (i = 0; i < srat_num_cpus; i++)
 541                 node_cpuid[i].nid = pxm_to_nid_map[node_cpuid[i].nid];
 542
 543         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 544                num_online_nodes());
 545         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 546                num_node_memblks);
 547
 548         if (!slit_table)
 549                 return;
 550         memset(numa_slit, -1, sizeof(numa_slit));
 551         for (i = 0; i < slit_table->localities; i++) {
 552                 if (!pxm_bit_test(i))
 553                         continue;
 554                 node_from = pxm_to_nid_map[i];
 555                 for (j = 0; j < slit_table->localities; j++) {
 556                         if (!pxm_bit_test(j))
 557                                 continue;
 558                         node_to = pxm_to_nid_map[j];
 559                         node_distance(node_from, node_to) =
 560                             slit_table->entry[i * slit_table->localities + j];
 561                 }
 562         }
 563
 564 #ifdef SLIT_DEBUG
 565         printk("ACPI 2.0 SLIT locality table:\n");
 566         for_each_online_node(i) {
 567                 for_each_online_node(j)
 568                     printk("%03d ", node_distance(i, j));
 569                 printk("\n");
 570         }
 571 #endif
 572 }
 573 #endif                          /* CONFIG_ACPI_NUMA */
 574
 575 /*
 576  * success: return IRQ number (>=0)
 577  * failure: return < 0
 578  */
 579 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 580 {
 581         if (has_8259 && gsi < 16)
 582                 return isa_irq_to_vector(gsi);
 583
 584         return iosapic_register_intr(gsi,
 585                                      (polarity ==
 586                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 587                                      IOSAPIC_POL_LOW,
 588                                      (triggering ==
 589                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 590                                      IOSAPIC_LEVEL);
 591 }
 592
 593 EXPORT_SYMBOL(acpi_register_gsi);
 594
 595 void acpi_unregister_gsi(u32 gsi)
 596 {
 597         iosapic_unregister_intr(gsi);
 598 }
 599
 600 EXPORT_SYMBOL(acpi_unregister_gsi);
 601
 602 static int __init acpi_parse_fadt(unsigned long phys_addr, unsigned long size)
 603 {
 604         struct acpi_table_header *fadt_header;
 605         struct fadt_descriptor_rev2 *fadt;
 606
 607         if (!phys_addr || !size)
 608                 return -EINVAL;
 609
 610         fadt_header = (struct acpi_table_header *)__va(phys_addr);
 611         if (fadt_header->revision != 3)
 612                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 613
 614         fadt = (struct fadt_descriptor_rev2 *)fadt_header;
 615
 616         if (!(fadt->iapc_boot_arch & BAF_8042_KEYBOARD_CONTROLLER))
 617                 acpi_kbd_controller_present = 0;
 618
 619         if (fadt->iapc_boot_arch & BAF_LEGACY_DEVICES)
 620                 acpi_legacy_devices = 1;
 621
 622         acpi_register_gsi(fadt->sci_int, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
 623         return 0;
 624 }
 625
 626 unsigned long __init acpi_find_rsdp(void)
 627 {
 628         unsigned long rsdp_phys = 0;
 629
 630         if (efi.acpi20)
 631                 rsdp_phys = __pa(efi.acpi20);
 632         else if (efi.acpi)
 633                 printk(KERN_WARNING PREFIX
 634                        "v1.0/r0.71 tables no longer supported\n");
 635         return rsdp_phys;
 636 }
 637
 638 int __init acpi_boot_init(void)
 639 {
 640
 641         /*
 642          * MADT
 643          * ----
 644          * Parse the Multiple APIC Description Table (MADT), if exists.
 645          * Note that this table provides platform SMP configuration
 646          * information -- the successor to MPS tables.
 647          */
 648
 649         if (acpi_table_parse(ACPI_APIC, acpi_parse_madt) < 1) {
 650                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 651                 goto skip_madt;
 652         }
 653
 654         /* Local APIC */
 655
 656         if (acpi_table_parse_madt
 657             (ACPI_MADT_LAPIC_ADDR_OVR, acpi_parse_lapic_addr_ovr, 0) < 0)
 658                 printk(KERN_ERR PREFIX
 659                        "Error parsing LAPIC address override entry\n");
 660
 661         if (acpi_table_parse_madt(ACPI_MADT_LSAPIC, acpi_parse_lsapic, NR_CPUS)
 662             < 1)
 663                 printk(KERN_ERR PREFIX
 664                        "Error parsing MADT - no LAPIC entries\n");
 665
 666         if (acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0)
 667             < 0)
 668                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 669
 670         /* I/O APIC */
 671
 672         if (acpi_table_parse_madt
 673             (ACPI_MADT_IOSAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1)
 674                 printk(KERN_ERR PREFIX
 675                        "Error parsing MADT - no IOSAPIC entries\n");
 676
 677         /* System-Level Interrupt Routing */
 678
 679         if (acpi_table_parse_madt
 680             (ACPI_MADT_PLAT_INT_SRC, acpi_parse_plat_int_src,
 681              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 682                 printk(KERN_ERR PREFIX
 683                        "Error parsing platform interrupt source entry\n");
 684
 685         if (acpi_table_parse_madt
 686             (ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr, 0) < 0)
 687                 printk(KERN_ERR PREFIX
 688                        "Error parsing interrupt source overrides entry\n");
 689
 690         if (acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src, 0) < 0)
 691                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 692       skip_madt:
 693
 694         /*
 695          * FADT says whether a legacy keyboard controller is present.
 696          * The FADT also contains an SCI_INT line, by which the system
 697          * gets interrupts such as power and sleep buttons.  If it's not
 698          * on a Legacy interrupt, it needs to be setup.
 699          */
 700         if (acpi_table_parse(ACPI_FADT, acpi_parse_fadt) < 1)
 701                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 702
 703 #ifdef CONFIG_SMP
 704         if (available_cpus == 0) {
 705                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 706                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 707                 smp_boot_data.cpu_phys_id[available_cpus] =
 708                     hard_smp_processor_id();
 709                 available_cpus = 1;     /* We've got at least one of these, no? */
 710         }
 711         smp_boot_data.cpu_count = available_cpus;
 712
 713         smp_build_cpu_map();
 714 # ifdef CONFIG_ACPI_NUMA
 715         if (srat_num_cpus == 0) {
 716                 int cpu, i = 1;
 717                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 718                         if (smp_boot_data.cpu_phys_id[cpu] !=
 719                             hard_smp_processor_id())
 720                                 node_cpuid[i++].phys_id =
 721                                     smp_boot_data.cpu_phys_id[cpu];
 722         }
 723 # endif
 724 #endif
 725 #ifdef CONFIG_ACPI_NUMA
 726         build_cpu_to_node_map();
 727 #endif
 728         /* Make boot-up look pretty */
 729         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 730                total_cpus);
 731         return 0;
 732 }
 733
 734 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 735 {
 736         int vector;
 737
 738         if (has_8259 && gsi < 16)
 739                 *irq = isa_irq_to_vector(gsi);
 740         else {
 741                 vector = gsi_to_vector(gsi);
 742                 if (vector == -1)
 743                         return -1;
 744
 745                 *irq = vector;
 746         }
 747         return 0;
 748 }
 749
 750 /*
 751  *  ACPI based hotplug CPU support
 752  */
 753 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 754 static
 755 int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
 756 {
 757 #ifdef CONFIG_ACPI_NUMA
 758         int pxm_id;
 759
 760         pxm_id = acpi_get_pxm(handle);
 761
 762         /*
 763          * Assuming that the container driver would have set the proximity
 764          * domain and would have initialized pxm_to_nid_map[pxm_id] && pxm_flag
 765          */
 766         node_cpuid[cpu].nid = (pxm_id < 0) ? 0 : pxm_to_nid_map[pxm_id];
 767
 768         node_cpuid[cpu].phys_id = physid;
 769 #endif
 770         return (0);
 771 }
 772
 773 int additional_cpus __initdata = -1;
 774
 775 static __init int setup_additional_cpus(char *s)
 776 {
 777         if (s)
 778                 additional_cpus = simple_strtol(s, NULL, 0);
 779
 780         return 0;
 781 }
 782
 783 early_param("additional_cpus", setup_additional_cpus);
 784
 785 /*
 786  * cpu_possible_map should be static, it cannot change as cpu's
 787  * are onlined, or offlined. The reason is per-cpu data-structures
 788  * are allocated by some modules at init time, and dont expect to
 789  * do this dynamically on cpu arrival/departure.
 790  * cpu_present_map on the other hand can change dynamically.
 791  * In case when cpu_hotplug is not compiled, then we resort to current
 792  * behaviour, which is cpu_possible == cpu_present.
 793  * - Ashok Raj
 794  *
 795  * Three ways to find out the number of additional hotplug CPUs:
 796  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 797  * - The user can overwrite it with additional_cpus=NUM
 798  * - Otherwise don't reserve additional CPUs.
 799  */
 800 __init void prefill_possible_map(void)
 801 {
 802         int i;
 803         int possible, disabled_cpus;
 804
 805         disabled_cpus = total_cpus - available_cpus;
 806
 807         if (additional_cpus == -1) {
 808                 if (disabled_cpus > 0)
 809                         additional_cpus = disabled_cpus;
 810                 else
 811                         additional_cpus = 0;
 812         }
 813
 814         possible = available_cpus + additional_cpus;
 815
 816         if (possible > NR_CPUS)
 817                 possible = NR_CPUS;
 818
 819         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 820                 possible, max((possible - available_cpus), 0));
 821
 822         for (i = 0; i < possible; i++)
 823                 cpu_set(i, cpu_possible_map);
 824 }
 825
 826 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 827 {
 828         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 829         union acpi_object *obj;
 830         struct acpi_table_lsapic *lsapic;
 831         cpumask_t tmp_map;
 832         long physid;
 833         int cpu;
 834
 835         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 836                 return -EINVAL;
 837
 838         if (!buffer.length || !buffer.pointer)
 839                 return -EINVAL;
 840
 841         obj = buffer.pointer;
 842         if (obj->type != ACPI_TYPE_BUFFER ||
 843             obj->buffer.length < sizeof(*lsapic)) {
 844                 acpi_os_free(buffer.pointer);
 845                 return -EINVAL;
 846         }
 847
 848         lsapic = (struct acpi_table_lsapic *)obj->buffer.pointer;
 849
 850         if ((lsapic->header.type != ACPI_MADT_LSAPIC) ||
 851             (!lsapic->flags.enabled)) {
 852                 acpi_os_free(buffer.pointer);
 853                 return -EINVAL;
 854         }
 855
 856         physid = ((lsapic->id << 8) | (lsapic->eid));
 857
 858         acpi_os_free(buffer.pointer);
 859         buffer.length = ACPI_ALLOCATE_BUFFER;
 860         buffer.pointer = NULL;
 861
 862         cpus_complement(tmp_map, cpu_present_map);
 863         cpu = first_cpu(tmp_map);
 864         if (cpu >= NR_CPUS)
 865                 return -EINVAL;
 866
 867         acpi_map_cpu2node(handle, cpu, physid);
 868
 869         cpu_set(cpu, cpu_present_map);
 870         ia64_cpu_to_sapicid[cpu] = physid;
 871         ia64_acpiid_to_sapicid[lsapic->acpi_id] = ia64_cpu_to_sapicid[cpu];
 872
 873         *pcpu = cpu;
 874         return (0);
 875 }
 876
 877 EXPORT_SYMBOL(acpi_map_lsapic);
 878
 879 int acpi_unmap_lsapic(int cpu)
 880 {
 881         int i;
 882
 883         for (i = 0; i < MAX_SAPICS; i++) {
 884                 if (ia64_acpiid_to_sapicid[i] == ia64_cpu_to_sapicid[cpu]) {
 885                         ia64_acpiid_to_sapicid[i] = -1;
 886                         break;
 887                 }
 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_table_iosapic *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                 acpi_os_free(buffer.pointer);
 923                 return AE_OK;
 924         }
 925
 926         iosapic = (struct acpi_table_iosapic *)obj->buffer.pointer;
 927
 928         if (iosapic->header.type != ACPI_MADT_IOSAPIC) {
 929                 acpi_os_free(buffer.pointer);
 930                 return AE_OK;
 931         }
 932
 933         gsi_base = iosapic->global_irq_base;
 934
 935         acpi_os_free(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_nid_map[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 */