arch/ia64/kernel/efi.c

   1 /*
   2  * Extensible Firmware Interface
   3  *
   4  * Based on Extensible Firmware Interface Specification version 0.9 April 30, 1999
   5  *
   6  * Copyright (C) 1999 VA Linux Systems
   7  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   8  * Copyright (C) 1999-2003 Hewlett-Packard Co.
   9  *      David Mosberger-Tang <davidm@hpl.hp.com>
  10  *      Stephane Eranian <eranian@hpl.hp.com>
  11  * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
  12  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
  13  *
  14  * All EFI Runtime Services are not implemented yet as EFI only
  15  * supports physical mode addressing on SoftSDV. This is to be fixed
  16  * in a future version.  --drummond 1999-07-20
  17  *
  18  * Implemented EFI runtime services and virtual mode calls.  --davidm
  19  *
  20  * Goutham Rao: <goutham.rao@intel.com>
  21  *      Skip non-WB memory and ignore empty memory ranges.
  22  */
  23 #include <linux/config.h>
  24 #include <linux/module.h>
  25 #include <linux/kernel.h>
  26 #include <linux/init.h>
  27 #include <linux/types.h>
  28 #include <linux/time.h>
  29 #include <linux/efi.h>
  30
  31 #include <asm/io.h>
  32 #include <asm/kregs.h>
  33 #include <asm/meminit.h>
  34 #include <asm/pgtable.h>
  35 #include <asm/processor.h>
  36 #include <asm/mca.h>
  37
  38 #define EFI_DEBUG       0
  39
  40 extern efi_status_t efi_call_phys (void *, ...);
  41
  42 struct efi efi;
  43 EXPORT_SYMBOL(efi);
  44 static efi_runtime_services_t *runtime;
  45 static unsigned long mem_limit = ~0UL, max_addr = ~0UL;
  46
  47 #define efi_call_virt(f, args...)       (*(f))(args)
  48
  49 #define STUB_GET_TIME(prefix, adjust_arg)                                                         \
  50 static efi_status_t                                                                               \
  51 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                                            \
  52 {                                                                                                 \
  53         struct ia64_fpreg fr[6];                                                                  \
  54         efi_time_cap_t *atc = NULL;                                                               \
  55         efi_status_t ret;                                                                         \
  56                                                                                                   \
  57         if (tc)                                                                                   \
  58                 atc = adjust_arg(tc);                                                             \
  59         ia64_save_scratch_fpregs(fr);                                                             \
  60         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm), atc); \
  61         ia64_load_scratch_fpregs(fr);                                                             \
  62         return ret;                                                                               \
  63 }
  64
  65 #define STUB_SET_TIME(prefix, adjust_arg)                                                       \
  66 static efi_status_t                                                                             \
  67 prefix##_set_time (efi_time_t *tm)                                                              \
  68 {                                                                                               \
  69         struct ia64_fpreg fr[6];                                                                \
  70         efi_status_t ret;                                                                       \
  71                                                                                                 \
  72         ia64_save_scratch_fpregs(fr);                                                           \
  73         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), adjust_arg(tm));    \
  74         ia64_load_scratch_fpregs(fr);                                                           \
  75         return ret;                                                                             \
  76 }
  77
  78 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  79 static efi_status_t                                                                             \
  80 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm)             \
  81 {                                                                                               \
  82         struct ia64_fpreg fr[6];                                                                \
  83         efi_status_t ret;                                                                       \
  84                                                                                                 \
  85         ia64_save_scratch_fpregs(fr);                                                           \
  86         ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),       \
  87                                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));      \
  88         ia64_load_scratch_fpregs(fr);                                                           \
  89         return ret;                                                                             \
  90 }
  91
  92 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  93 static efi_status_t                                                                             \
  94 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                                   \
  95 {                                                                                               \
  96         struct ia64_fpreg fr[6];                                                                \
  97         efi_time_t *atm = NULL;                                                                 \
  98         efi_status_t ret;                                                                       \
  99                                                                                                 \
 100         if (tm)                                                                                 \
 101                 atm = adjust_arg(tm);                                                           \
 102         ia64_save_scratch_fpregs(fr);                                                           \
 103         ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),       \
 104                                 enabled, atm);                                                  \
 105         ia64_load_scratch_fpregs(fr);                                                           \
 106         return ret;                                                                             \
 107 }
 108
 109 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                           \
 110 static efi_status_t                                                                     \
 111 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,               \
 112                        unsigned long *data_size, void *data)                            \
 113 {                                                                                       \
 114         struct ia64_fpreg fr[6];                                                        \
 115         u32 *aattr = NULL;                                                                      \
 116         efi_status_t ret;                                                               \
 117                                                                                         \
 118         if (attr)                                                                       \
 119                 aattr = adjust_arg(attr);                                               \
 120         ia64_save_scratch_fpregs(fr);                                                   \
 121         ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable),     \
 122                                 adjust_arg(name), adjust_arg(vendor), aattr,            \
 123                                 adjust_arg(data_size), adjust_arg(data));               \
 124         ia64_load_scratch_fpregs(fr);                                                   \
 125         return ret;                                                                     \
 126 }
 127
 128 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                                              \
 129 static efi_status_t                                                                             \
 130 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor)   \
 131 {                                                                                               \
 132         struct ia64_fpreg fr[6];                                                                \
 133         efi_status_t ret;                                                                       \
 134                                                                                                 \
 135         ia64_save_scratch_fpregs(fr);                                                           \
 136         ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable),   \
 137                                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));   \
 138         ia64_load_scratch_fpregs(fr);                                                           \
 139         return ret;                                                                             \
 140 }
 141
 142 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                           \
 143 static efi_status_t                                                                     \
 144 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, unsigned long attr,      \
 145                        unsigned long data_size, void *data)                             \
 146 {                                                                                       \
 147         struct ia64_fpreg fr[6];                                                        \
 148         efi_status_t ret;                                                               \
 149                                                                                         \
 150         ia64_save_scratch_fpregs(fr);                                                   \
 151         ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable),     \
 152                                 adjust_arg(name), adjust_arg(vendor), attr, data_size,  \
 153                                 adjust_arg(data));                                      \
 154         ia64_load_scratch_fpregs(fr);                                                   \
 155         return ret;                                                                     \
 156 }
 157
 158 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                                       \
 159 static efi_status_t                                                                             \
 160 prefix##_get_next_high_mono_count (u32 *count)                                                  \
 161 {                                                                                               \
 162         struct ia64_fpreg fr[6];                                                                \
 163         efi_status_t ret;                                                                       \
 164                                                                                                 \
 165         ia64_save_scratch_fpregs(fr);                                                           \
 166         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)                              \
 167                                 __va(runtime->get_next_high_mono_count), adjust_arg(count));    \
 168         ia64_load_scratch_fpregs(fr);                                                           \
 169         return ret;                                                                             \
 170 }
 171
 172 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                   \
 173 static void                                                                     \
 174 prefix##_reset_system (int reset_type, efi_status_t status,                     \
 175                        unsigned long data_size, efi_char16_t *data)             \
 176 {                                                                               \
 177         struct ia64_fpreg fr[6];                                                \
 178         efi_char16_t *adata = NULL;                                             \
 179                                                                                 \
 180         if (data)                                                               \
 181                 adata = adjust_arg(data);                                       \
 182                                                                                 \
 183         ia64_save_scratch_fpregs(fr);                                           \
 184         efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system),   \
 185                           reset_type, status, data_size, adata);                \
 186         /* should not return, but just in case... */                            \
 187         ia64_load_scratch_fpregs(fr);                                           \
 188 }
 189
 190 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 191
 192 STUB_GET_TIME(phys, phys_ptr)
 193 STUB_SET_TIME(phys, phys_ptr)
 194 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 195 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 196 STUB_GET_VARIABLE(phys, phys_ptr)
 197 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 198 STUB_SET_VARIABLE(phys, phys_ptr)
 199 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 200 STUB_RESET_SYSTEM(phys, phys_ptr)
 201
 202 #define id(arg) arg
 203
 204 STUB_GET_TIME(virt, id)
 205 STUB_SET_TIME(virt, id)
 206 STUB_GET_WAKEUP_TIME(virt, id)
 207 STUB_SET_WAKEUP_TIME(virt, id)
 208 STUB_GET_VARIABLE(virt, id)
 209 STUB_GET_NEXT_VARIABLE(virt, id)
 210 STUB_SET_VARIABLE(virt, id)
 211 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 212 STUB_RESET_SYSTEM(virt, id)
 213
 214 void
 215 efi_gettimeofday (struct timespec *ts)
 216 {
 217         efi_time_t tm;
 218
 219         memset(ts, 0, sizeof(ts));
 220         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS)
 221                 return;
 222
 223         ts->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
 224         ts->tv_nsec = tm.nanosecond;
 225 }
 226
 227 static int
 228 is_available_memory (efi_memory_desc_t *md)
 229 {
 230         if (!(md->attribute & EFI_MEMORY_WB))
 231                 return 0;
 232
 233         switch (md->type) {
 234               case EFI_LOADER_CODE:
 235               case EFI_LOADER_DATA:
 236               case EFI_BOOT_SERVICES_CODE:
 237               case EFI_BOOT_SERVICES_DATA:
 238               case EFI_CONVENTIONAL_MEMORY:
 239                 return 1;
 240         }
 241         return 0;
 242 }
 243
 244 typedef struct kern_memdesc {
 245         u64 attribute;
 246         u64 start;
 247         u64 num_pages;
 248 } kern_memdesc_t;
 249
 250 static kern_memdesc_t *kern_memmap;
 251
 252 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 253
 254 static inline u64
 255 kmd_end(kern_memdesc_t *kmd)
 256 {
 257         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 258 }
 259
 260 static inline u64
 261 efi_md_end(efi_memory_desc_t *md)
 262 {
 263         return (md->phys_addr + efi_md_size(md));
 264 }
 265
 266 static inline int
 267 efi_wb(efi_memory_desc_t *md)
 268 {
 269         return (md->attribute & EFI_MEMORY_WB);
 270 }
 271
 272 static inline int
 273 efi_uc(efi_memory_desc_t *md)
 274 {
 275         return (md->attribute & EFI_MEMORY_UC);
 276 }
 277
 278 static void
 279 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 280 {
 281         kern_memdesc_t *k;
 282         u64 start, end, voff;
 283
 284         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 285         for (k = kern_memmap; k->start != ~0UL; k++) {
 286                 if (k->attribute != attr)
 287                         continue;
 288                 start = PAGE_ALIGN(k->start);
 289                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 290                 if (start < end)
 291                         if ((*callback)(start + voff, end + voff, arg) < 0)
 292                                 return;
 293         }
 294 }
 295
 296 /*
 297  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 298  * has memory that is available for OS use.
 299  */
 300 void
 301 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 302 {
 303         walk(callback, arg, EFI_MEMORY_WB);
 304 }
 305
 306 /*
 307  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 308  * has memory that is available for uncached allocator.
 309  */
 310 void
 311 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 312 {
 313         walk(callback, arg, EFI_MEMORY_UC);
 314 }
 315
 316 /*
 317  * Look for the PAL_CODE region reported by EFI and maps it using an
 318  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 319  * Abstraction Layer chapter 11 in ADAG
 320  */
 321
 322 void *
 323 efi_get_pal_addr (void)
 324 {
 325         void *efi_map_start, *efi_map_end, *p;
 326         efi_memory_desc_t *md;
 327         u64 efi_desc_size;
 328         int pal_code_count = 0;
 329         u64 vaddr, mask;
 330
 331         efi_map_start = __va(ia64_boot_param->efi_memmap);
 332         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 333         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 334
 335         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 336                 md = p;
 337                 if (md->type != EFI_PAL_CODE)
 338                         continue;
 339
 340                 if (++pal_code_count > 1) {
 341                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
 342                                md->phys_addr);
 343                         continue;
 344                 }
 345                 /*
 346                  * The only ITLB entry in region 7 that is used is the one installed by
 347                  * __start().  That entry covers a 64MB range.
 348                  */
 349                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 350                 vaddr = PAGE_OFFSET + md->phys_addr;
 351
 352                 /*
 353                  * We must check that the PAL mapping won't overlap with the kernel
 354                  * mapping.
 355                  *
 356                  * PAL code is guaranteed to be aligned on a power of 2 between 4k and
 357                  * 256KB and that only one ITR is needed to map it. This implies that the
 358                  * PAL code is always aligned on its size, i.e., the closest matching page
 359                  * size supported by the TLB. Therefore PAL code is guaranteed never to
 360                  * cross a 64MB unless it is bigger than 64MB (very unlikely!).  So for
 361                  * now the following test is enough to determine whether or not we need a
 362                  * dedicated ITR for the PAL code.
 363                  */
 364                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 365                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 366                                __FUNCTION__);
 367                         continue;
 368                 }
 369
 370                 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
 371                         panic("Woah!  PAL code size bigger than a granule!");
 372
 373 #if EFI_DEBUG
 374                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 375
 376                 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 377                         smp_processor_id(), md->phys_addr,
 378                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 379                         vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 380 #endif
 381                 return __va(md->phys_addr);
 382         }
 383         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found",
 384                __FUNCTION__);
 385         return NULL;
 386 }
 387
 388 void
 389 efi_map_pal_code (void)
 390 {
 391         void *pal_vaddr = efi_get_pal_addr ();
 392         u64 psr;
 393
 394         if (!pal_vaddr)
 395                 return;
 396
 397         /*
 398          * Cannot write to CRx with PSR.ic=1
 399          */
 400         psr = ia64_clear_ic();
 401         ia64_itr(0x1, IA64_TR_PALCODE, GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 402                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 403                  IA64_GRANULE_SHIFT);
 404         ia64_set_psr(psr);              /* restore psr */
 405         ia64_srlz_i();
 406 }
 407
 408 void __init
 409 efi_init (void)
 410 {
 411         void *efi_map_start, *efi_map_end;
 412         efi_config_table_t *config_tables;
 413         efi_char16_t *c16;
 414         u64 efi_desc_size;
 415         char *cp, vendor[100] = "unknown";
 416         extern char saved_command_line[];
 417         int i;
 418
 419         /* it's too early to be able to use the standard kernel command line support... */
 420         for (cp = saved_command_line; *cp; ) {
 421                 if (memcmp(cp, "mem=", 4) == 0) {
 422                         mem_limit = memparse(cp + 4, &cp);
 423                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 424                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 425                 } else {
 426                         while (*cp != ' ' && *cp)
 427                                 ++cp;
 428                         while (*cp == ' ')
 429                                 ++cp;
 430                 }
 431         }
 432         if (max_addr != ~0UL)
 433                 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
 434
 435         efi.systab = __va(ia64_boot_param->efi_systab);
 436
 437         /*
 438          * Verify the EFI Table
 439          */
 440         if (efi.systab == NULL)
 441                 panic("Woah! Can't find EFI system table.\n");
 442         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 443                 panic("Woah! EFI system table signature incorrect\n");
 444         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 445                 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
 446                        "got %d.%02d, expected %d.%02d\n",
 447                        efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
 448                        EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
 449
 450         config_tables = __va(efi.systab->tables);
 451
 452         /* Show what we know for posterity */
 453         c16 = __va(efi.systab->fw_vendor);
 454         if (c16) {
 455                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
 456                         vendor[i] = *c16++;
 457                 vendor[i] = '\0';
 458         }
 459
 460         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 461                efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
 462
 463         efi.mps        = EFI_INVALID_TABLE_ADDR;
 464         efi.acpi       = EFI_INVALID_TABLE_ADDR;
 465         efi.acpi20     = EFI_INVALID_TABLE_ADDR;
 466         efi.smbios     = EFI_INVALID_TABLE_ADDR;
 467         efi.sal_systab = EFI_INVALID_TABLE_ADDR;
 468         efi.boot_info  = EFI_INVALID_TABLE_ADDR;
 469         efi.hcdp       = EFI_INVALID_TABLE_ADDR;
 470         efi.uga        = EFI_INVALID_TABLE_ADDR;
 471
 472         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 473                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 474                         efi.mps = config_tables[i].table;
 475                         printk(" MPS=0x%lx", config_tables[i].table);
 476                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 477                         efi.acpi20 = config_tables[i].table;
 478                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 479                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 480                         efi.acpi = config_tables[i].table;
 481                         printk(" ACPI=0x%lx", config_tables[i].table);
 482                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 483                         efi.smbios = config_tables[i].table;
 484                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 485                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 486                         efi.sal_systab = config_tables[i].table;
 487                         printk(" SALsystab=0x%lx", config_tables[i].table);
 488                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 489                         efi.hcdp = config_tables[i].table;
 490                         printk(" HCDP=0x%lx", config_tables[i].table);
 491                 }
 492         }
 493         printk("\n");
 494
 495         runtime = __va(efi.systab->runtime);
 496         efi.get_time = phys_get_time;
 497         efi.set_time = phys_set_time;
 498         efi.get_wakeup_time = phys_get_wakeup_time;
 499         efi.set_wakeup_time = phys_set_wakeup_time;
 500         efi.get_variable = phys_get_variable;
 501         efi.get_next_variable = phys_get_next_variable;
 502         efi.set_variable = phys_set_variable;
 503         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 504         efi.reset_system = phys_reset_system;
 505
 506         efi_map_start = __va(ia64_boot_param->efi_memmap);
 507         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 508         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 509
 510 #if EFI_DEBUG
 511         /* print EFI memory map: */
 512         {
 513                 efi_memory_desc_t *md;
 514                 void *p;
 515
 516                 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
 517                         md = p;
 518                         printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
 519                                i, md->type, md->attribute, md->phys_addr,
 520                                md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 521                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 522                 }
 523         }
 524 #endif
 525
 526         efi_map_pal_code();
 527         efi_enter_virtual_mode();
 528 }
 529
 530 void
 531 efi_enter_virtual_mode (void)
 532 {
 533         void *efi_map_start, *efi_map_end, *p;
 534         efi_memory_desc_t *md;
 535         efi_status_t status;
 536         u64 efi_desc_size;
 537
 538         efi_map_start = __va(ia64_boot_param->efi_memmap);
 539         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 540         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 541
 542         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 543                 md = p;
 544                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 545                         /*
 546                          * Some descriptors have multiple bits set, so the order of
 547                          * the tests is relevant.
 548                          */
 549                         if (md->attribute & EFI_MEMORY_WB) {
 550                                 md->virt_addr = (u64) __va(md->phys_addr);
 551                         } else if (md->attribute & EFI_MEMORY_UC) {
 552                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 553                         } else if (md->attribute & EFI_MEMORY_WC) {
 554 #if 0
 555                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 556                                                                            | _PAGE_D
 557                                                                            | _PAGE_MA_WC
 558                                                                            | _PAGE_PL_0
 559                                                                            | _PAGE_AR_RW));
 560 #else
 561                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 562                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 563 #endif
 564                         } else if (md->attribute & EFI_MEMORY_WT) {
 565 #if 0
 566                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 567                                                                            | _PAGE_D | _PAGE_MA_WT
 568                                                                            | _PAGE_PL_0
 569                                                                            | _PAGE_AR_RW));
 570 #else
 571                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 572                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 573 #endif
 574                         }
 575                 }
 576         }
 577
 578         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 579                                ia64_boot_param->efi_memmap_size,
 580                                efi_desc_size, ia64_boot_param->efi_memdesc_version,
 581                                ia64_boot_param->efi_memmap);
 582         if (status != EFI_SUCCESS) {
 583                 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
 584                        "(status=%lu)\n", status);
 585                 return;
 586         }
 587
 588         /*
 589          * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
 590          */
 591         efi.get_time = virt_get_time;
 592         efi.set_time = virt_set_time;
 593         efi.get_wakeup_time = virt_get_wakeup_time;
 594         efi.set_wakeup_time = virt_set_wakeup_time;
 595         efi.get_variable = virt_get_variable;
 596         efi.get_next_variable = virt_get_next_variable;
 597         efi.set_variable = virt_set_variable;
 598         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 599         efi.reset_system = virt_reset_system;
 600 }
 601
 602 /*
 603  * Walk the EFI memory map looking for the I/O port range.  There can only be one entry of
 604  * this type, other I/O port ranges should be described via ACPI.
 605  */
 606 u64
 607 efi_get_iobase (void)
 608 {
 609         void *efi_map_start, *efi_map_end, *p;
 610         efi_memory_desc_t *md;
 611         u64 efi_desc_size;
 612
 613         efi_map_start = __va(ia64_boot_param->efi_memmap);
 614         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 615         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 616
 617         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 618                 md = p;
 619                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 620                         if (md->attribute & EFI_MEMORY_UC)
 621                                 return md->phys_addr;
 622                 }
 623         }
 624         return 0;
 625 }
 626
 627 static struct kern_memdesc *
 628 kern_memory_descriptor (unsigned long phys_addr)
 629 {
 630         struct kern_memdesc *md;
 631
 632         for (md = kern_memmap; md->start != ~0UL; md++) {
 633                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 634                          return md;
 635         }
 636         return 0;
 637 }
 638
 639 static efi_memory_desc_t *
 640 efi_memory_descriptor (unsigned long phys_addr)
 641 {
 642         void *efi_map_start, *efi_map_end, *p;
 643         efi_memory_desc_t *md;
 644         u64 efi_desc_size;
 645
 646         efi_map_start = __va(ia64_boot_param->efi_memmap);
 647         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 648         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 649
 650         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 651                 md = p;
 652
 653                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 654                          return md;
 655         }
 656         return 0;
 657 }
 658
 659 u32
 660 efi_mem_type (unsigned long phys_addr)
 661 {
 662         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 663
 664         if (md)
 665                 return md->type;
 666         return 0;
 667 }
 668
 669 u64
 670 efi_mem_attributes (unsigned long phys_addr)
 671 {
 672         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 673
 674         if (md)
 675                 return md->attribute;
 676         return 0;
 677 }
 678 EXPORT_SYMBOL(efi_mem_attributes);
 679
 680 u64
 681 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 682 {
 683         unsigned long end = phys_addr + size;
 684         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 685         u64 attr;
 686
 687         if (!md)
 688                 return 0;
 689
 690         /*
 691          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 692          * the kernel that firmware needs this region mapped.
 693          */
 694         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 695         do {
 696                 unsigned long md_end = efi_md_end(md);
 697
 698                 if (end <= md_end)
 699                         return attr;
 700
 701                 md = efi_memory_descriptor(md_end);
 702                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 703                         return 0;
 704         } while (md);
 705         return 0;
 706 }
 707
 708 u64
 709 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 710 {
 711         unsigned long end = phys_addr + size;
 712         struct kern_memdesc *md;
 713         u64 attr;
 714
 715         /*
 716          * This is a hack for ioremap calls before we set up kern_memmap.
 717          * Maybe we should do efi_memmap_init() earlier instead.
 718          */
 719         if (!kern_memmap) {
 720                 attr = efi_mem_attribute(phys_addr, size);
 721                 if (attr & EFI_MEMORY_WB)
 722                         return EFI_MEMORY_WB;
 723                 return 0;
 724         }
 725
 726         md = kern_memory_descriptor(phys_addr);
 727         if (!md)
 728                 return 0;
 729
 730         attr = md->attribute;
 731         do {
 732                 unsigned long md_end = kmd_end(md);
 733
 734                 if (end <= md_end)
 735                         return attr;
 736
 737                 md = kern_memory_descriptor(md_end);
 738                 if (!md || md->attribute != attr)
 739                         return 0;
 740         } while (md);
 741         return 0;
 742 }
 743 EXPORT_SYMBOL(kern_mem_attribute);
 744
 745 int
 746 valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
 747 {
 748         u64 attr;
 749
 750         /*
 751          * /dev/mem reads and writes use copy_to_user(), which implicitly
 752          * uses a granule-sized kernel identity mapping.  It's really
 753          * only safe to do this for regions in kern_memmap.  For more
 754          * details, see Documentation/ia64/aliasing.txt.
 755          */
 756         attr = kern_mem_attribute(phys_addr, size);
 757         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 758                 return 1;
 759         return 0;
 760 }
 761
 762 int
 763 valid_mmap_phys_addr_range (unsigned long phys_addr, unsigned long size)
 764 {
 765         /*
 766          * MMIO regions are often missing from the EFI memory map.
 767          * We must allow mmap of them for programs like X, so we
 768          * currently can't do any useful validation.
 769          */
 770         return 1;
 771 }
 772
 773 pgprot_t
 774 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 775                      pgprot_t vma_prot)
 776 {
 777         unsigned long phys_addr = pfn << PAGE_SHIFT;
 778         u64 attr;
 779
 780         /*
 781          * For /dev/mem mmap, we use user mappings, but if the region is
 782          * in kern_memmap (and hence may be covered by a kernel mapping),
 783          * we must use the same attribute as the kernel mapping.
 784          */
 785         attr = kern_mem_attribute(phys_addr, size);
 786         if (attr & EFI_MEMORY_WB)
 787                 return pgprot_cacheable(vma_prot);
 788         else if (attr & EFI_MEMORY_UC)
 789                 return pgprot_noncached(vma_prot);
 790
 791         /*
 792          * Some chipsets don't support UC access to memory.  If
 793          * WB is supported, we prefer that.
 794          */
 795         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 796                 return pgprot_cacheable(vma_prot);
 797
 798         return pgprot_noncached(vma_prot);
 799 }
 800
 801 int __init
 802 efi_uart_console_only(void)
 803 {
 804         efi_status_t status;
 805         char *s, name[] = "ConOut";
 806         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 807         efi_char16_t *utf16, name_utf16[32];
 808         unsigned char data[1024];
 809         unsigned long size = sizeof(data);
 810         struct efi_generic_dev_path *hdr, *end_addr;
 811         int uart = 0;
 812
 813         /* Convert to UTF-16 */
 814         utf16 = name_utf16;
 815         s = name;
 816         while (*s)
 817                 *utf16++ = *s++ & 0x7f;
 818         *utf16 = 0;
 819
 820         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 821         if (status != EFI_SUCCESS) {
 822                 printk(KERN_ERR "No EFI %s variable?\n", name);
 823                 return 0;
 824         }
 825
 826         hdr = (struct efi_generic_dev_path *) data;
 827         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 828         while (hdr < end_addr) {
 829                 if (hdr->type == EFI_DEV_MSG &&
 830                     hdr->sub_type == EFI_DEV_MSG_UART)
 831                         uart = 1;
 832                 else if (hdr->type == EFI_DEV_END_PATH ||
 833                           hdr->type == EFI_DEV_END_PATH2) {
 834                         if (!uart)
 835                                 return 0;
 836                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 837                                 return 1;
 838                         uart = 0;
 839                 }
 840                 hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
 841         }
 842         printk(KERN_ERR "Malformed %s value\n", name);
 843         return 0;
 844 }
 845
 846 /*
 847  * Look for the first granule aligned memory descriptor memory
 848  * that is big enough to hold EFI memory map. Make sure this
 849  * descriptor is atleast granule sized so it does not get trimmed
 850  */
 851 struct kern_memdesc *
 852 find_memmap_space (void)
 853 {
 854         u64     contig_low=0, contig_high=0;
 855         u64     as = 0, ae;
 856         void *efi_map_start, *efi_map_end, *p, *q;
 857         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 858         u64     space_needed, efi_desc_size;
 859         unsigned long total_mem = 0;
 860
 861         efi_map_start = __va(ia64_boot_param->efi_memmap);
 862         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 863         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 864
 865         /*
 866          * Worst case: we need 3 kernel descriptors for each efi descriptor
 867          * (if every entry has a WB part in the middle, and UC head and tail),
 868          * plus one for the end marker.
 869          */
 870         space_needed = sizeof(kern_memdesc_t) *
 871                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 872
 873         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 874                 md = p;
 875                 if (!efi_wb(md)) {
 876                         continue;
 877                 }
 878                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 879                         contig_low = GRANULEROUNDUP(md->phys_addr);
 880                         contig_high = efi_md_end(md);
 881                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 882                                 check_md = q;
 883                                 if (!efi_wb(check_md))
 884                                         break;
 885                                 if (contig_high != check_md->phys_addr)
 886                                         break;
 887                                 contig_high = efi_md_end(check_md);
 888                         }
 889                         contig_high = GRANULEROUNDDOWN(contig_high);
 890                 }
 891                 if (!is_available_memory(md) || md->type == EFI_LOADER_DATA)
 892                         continue;
 893
 894                 /* Round ends inward to granule boundaries */
 895                 as = max(contig_low, md->phys_addr);
 896                 ae = min(contig_high, efi_md_end(md));
 897
 898                 /* keep within max_addr= command line arg */
 899                 ae = min(ae, max_addr);
 900                 if (ae <= as)
 901                         continue;
 902
 903                 /* avoid going over mem= command line arg */
 904                 if (total_mem + (ae - as) > mem_limit)
 905                         ae -= total_mem + (ae - as) - mem_limit;
 906
 907                 if (ae <= as)
 908                         continue;
 909
 910                 if (ae - as > space_needed)
 911                         break;
 912         }
 913         if (p >= efi_map_end)
 914                 panic("Can't allocate space for kernel memory descriptors");
 915
 916         return __va(as);
 917 }
 918
 919 /*
 920  * Walk the EFI memory map and gather all memory available for kernel
 921  * to use.  We can allocate partial granules only if the unavailable
 922  * parts exist, and are WB.
 923  */
 924 void
 925 efi_memmap_init(unsigned long *s, unsigned long *e)
 926 {
 927         struct kern_memdesc *k, *prev = 0;
 928         u64     contig_low=0, contig_high=0;
 929         u64     as, ae, lim;
 930         void *efi_map_start, *efi_map_end, *p, *q;
 931         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 932         u64     efi_desc_size;
 933         unsigned long total_mem = 0;
 934
 935         k = kern_memmap = find_memmap_space();
 936
 937         efi_map_start = __va(ia64_boot_param->efi_memmap);
 938         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 939         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 940
 941         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 942                 md = p;
 943                 if (!efi_wb(md)) {
 944                         if (efi_uc(md) && (md->type == EFI_CONVENTIONAL_MEMORY ||
 945                                            md->type == EFI_BOOT_SERVICES_DATA)) {
 946                                 k->attribute = EFI_MEMORY_UC;
 947                                 k->start = md->phys_addr;
 948                                 k->num_pages = md->num_pages;
 949                                 k++;
 950                         }
 951                         continue;
 952                 }
 953                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 954                         contig_low = GRANULEROUNDUP(md->phys_addr);
 955                         contig_high = efi_md_end(md);
 956                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 957                                 check_md = q;
 958                                 if (!efi_wb(check_md))
 959                                         break;
 960                                 if (contig_high != check_md->phys_addr)
 961                                         break;
 962                                 contig_high = efi_md_end(check_md);
 963                         }
 964                         contig_high = GRANULEROUNDDOWN(contig_high);
 965                 }
 966                 if (!is_available_memory(md))
 967                         continue;
 968
 969                 /*
 970                  * Round ends inward to granule boundaries
 971                  * Give trimmings to uncached allocator
 972                  */
 973                 if (md->phys_addr < contig_low) {
 974                         lim = min(efi_md_end(md), contig_low);
 975                         if (efi_uc(md)) {
 976                                 if (k > kern_memmap && (k-1)->attribute == EFI_MEMORY_UC &&
 977                                     kmd_end(k-1) == md->phys_addr) {
 978                                         (k-1)->num_pages += (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
 979                                 } else {
 980                                         k->attribute = EFI_MEMORY_UC;
 981                                         k->start = md->phys_addr;
 982                                         k->num_pages = (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
 983                                         k++;
 984                                 }
 985                         }
 986                         as = contig_low;
 987                 } else
 988                         as = md->phys_addr;
 989
 990                 if (efi_md_end(md) > contig_high) {
 991                         lim = max(md->phys_addr, contig_high);
 992                         if (efi_uc(md)) {
 993                                 if (lim == md->phys_addr && k > kern_memmap &&
 994                                     (k-1)->attribute == EFI_MEMORY_UC &&
 995                                     kmd_end(k-1) == md->phys_addr) {
 996                                         (k-1)->num_pages += md->num_pages;
 997                                 } else {
 998                                         k->attribute = EFI_MEMORY_UC;
 999                                         k->start = lim;
1000                                         k->num_pages = (efi_md_end(md) - lim) >> EFI_PAGE_SHIFT;
1001                                         k++;
1002                                 }
1003                         }
1004                         ae = contig_high;
1005                 } else
1006                         ae = efi_md_end(md);
1007
1008                 /* keep within max_addr= command line arg */
1009                 ae = min(ae, max_addr);
1010                 if (ae <= as)
1011                         continue;
1012
1013                 /* avoid going over mem= command line arg */
1014                 if (total_mem + (ae - as) > mem_limit)
1015                         ae -= total_mem + (ae - as) - mem_limit;
1016
1017                 if (ae <= as)
1018                         continue;
1019                 if (prev && kmd_end(prev) == md->phys_addr) {
1020                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1021                         total_mem += ae - as;
1022                         continue;
1023                 }
1024                 k->attribute = EFI_MEMORY_WB;
1025                 k->start = as;
1026                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1027                 total_mem += ae - as;
1028                 prev = k++;
1029         }
1030         k->start = ~0L; /* end-marker */
1031
1032         /* reserve the memory we are using for kern_memmap */
1033         *s = (u64)kern_memmap;
1034         *e = (u64)++k;
1035 }
1036
1037 void
1038 efi_initialize_iomem_resources(struct resource *code_resource,
1039                                struct resource *data_resource)
1040 {
1041         struct resource *res;
1042         void *efi_map_start, *efi_map_end, *p;
1043         efi_memory_desc_t *md;
1044         u64 efi_desc_size;
1045         char *name;
1046         unsigned long flags;
1047
1048         efi_map_start = __va(ia64_boot_param->efi_memmap);
1049         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1050         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1051
1052         res = NULL;
1053
1054         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1055                 md = p;
1056
1057                 if (md->num_pages == 0) /* should not happen */
1058                         continue;
1059
1060                 flags = IORESOURCE_MEM;
1061                 switch (md->type) {
1062
1063                         case EFI_MEMORY_MAPPED_IO:
1064                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1065                                 continue;
1066
1067                         case EFI_LOADER_CODE:
1068                         case EFI_LOADER_DATA:
1069                         case EFI_BOOT_SERVICES_DATA:
1070                         case EFI_BOOT_SERVICES_CODE:
1071                         case EFI_CONVENTIONAL_MEMORY:
1072                                 if (md->attribute & EFI_MEMORY_WP) {
1073                                         name = "System ROM";
1074                                         flags |= IORESOURCE_READONLY;
1075                                 } else {
1076                                         name = "System RAM";
1077                                 }
1078                                 break;
1079
1080                         case EFI_ACPI_MEMORY_NVS:
1081                                 name = "ACPI Non-volatile Storage";
1082                                 flags |= IORESOURCE_BUSY;
1083                                 break;
1084
1085                         case EFI_UNUSABLE_MEMORY:
1086                                 name = "reserved";
1087                                 flags |= IORESOURCE_BUSY | IORESOURCE_DISABLED;
1088                                 break;
1089
1090                         case EFI_RESERVED_TYPE:
1091                         case EFI_RUNTIME_SERVICES_CODE:
1092                         case EFI_RUNTIME_SERVICES_DATA:
1093                         case EFI_ACPI_RECLAIM_MEMORY:
1094                         default:
1095                                 name = "reserved";
1096                                 flags |= IORESOURCE_BUSY;
1097                                 break;
1098                 }
1099
1100                 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
1101                         printk(KERN_ERR "failed to alocate resource for iomem\n");
1102                         return;
1103                 }
1104
1105                 res->name = name;
1106                 res->start = md->phys_addr;
1107                 res->end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
1108                 res->flags = flags;
1109
1110                 if (insert_resource(&iomem_resource, res) < 0)
1111                         kfree(res);
1112                 else {
1113                         /*
1114                          * We don't know which region contains
1115                          * kernel data so we try it repeatedly and
1116                          * let the resource manager test it.
1117                          */
1118                         insert_resource(res, code_resource);
1119                         insert_resource(res, data_resource);
1120                 }
1121         }
1122 }