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  *
  12  * All EFI Runtime Services are not implemented yet as EFI only
  13  * supports physical mode addressing on SoftSDV. This is to be fixed
  14  * in a future version.  --drummond 1999-07-20
  15  *
  16  * Implemented EFI runtime services and virtual mode calls.  --davidm
  17  *
  18  * Goutham Rao: <goutham.rao@intel.com>
  19  *      Skip non-WB memory and ignore empty memory ranges.
  20  */
  21 #include <linux/config.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/types.h>
  26 #include <linux/time.h>
  27 #include <linux/efi.h>
  28
  29 #include <asm/io.h>
  30 #include <asm/kregs.h>
  31 #include <asm/meminit.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/processor.h>
  34 #include <asm/mca.h>
  35
  36 #define EFI_DEBUG       0
  37
  38 extern efi_status_t efi_call_phys (void *, ...);
  39
  40 struct efi efi;
  41 EXPORT_SYMBOL(efi);
  42 static efi_runtime_services_t *runtime;
  43 static unsigned long mem_limit = ~0UL, max_addr = ~0UL;
  44
  45 #define efi_call_virt(f, args...)       (*(f))(args)
  46
  47 #define STUB_GET_TIME(prefix, adjust_arg)                                                         \
  48 static efi_status_t                                                                               \
  49 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                                            \
  50 {                                                                                                 \
  51         struct ia64_fpreg fr[6];                                                                  \
  52         efi_time_cap_t *atc = NULL;                                                               \
  53         efi_status_t ret;                                                                         \
  54                                                                                                   \
  55         if (tc)                                                                                   \
  56                 atc = adjust_arg(tc);                                                             \
  57         ia64_save_scratch_fpregs(fr);                                                             \
  58         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm), atc); \
  59         ia64_load_scratch_fpregs(fr);                                                             \
  60         return ret;                                                                               \
  61 }
  62
  63 #define STUB_SET_TIME(prefix, adjust_arg)                                                       \
  64 static efi_status_t                                                                             \
  65 prefix##_set_time (efi_time_t *tm)                                                              \
  66 {                                                                                               \
  67         struct ia64_fpreg fr[6];                                                                \
  68         efi_status_t ret;                                                                       \
  69                                                                                                 \
  70         ia64_save_scratch_fpregs(fr);                                                           \
  71         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), adjust_arg(tm));    \
  72         ia64_load_scratch_fpregs(fr);                                                           \
  73         return ret;                                                                             \
  74 }
  75
  76 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  77 static efi_status_t                                                                             \
  78 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm)             \
  79 {                                                                                               \
  80         struct ia64_fpreg fr[6];                                                                \
  81         efi_status_t ret;                                                                       \
  82                                                                                                 \
  83         ia64_save_scratch_fpregs(fr);                                                           \
  84         ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),       \
  85                                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));      \
  86         ia64_load_scratch_fpregs(fr);                                                           \
  87         return ret;                                                                             \
  88 }
  89
  90 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  91 static efi_status_t                                                                             \
  92 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                                   \
  93 {                                                                                               \
  94         struct ia64_fpreg fr[6];                                                                \
  95         efi_time_t *atm = NULL;                                                                 \
  96         efi_status_t ret;                                                                       \
  97                                                                                                 \
  98         if (tm)                                                                                 \
  99                 atm = adjust_arg(tm);                                                           \
 100         ia64_save_scratch_fpregs(fr);                                                           \
 101         ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),       \
 102                                 enabled, atm);                                                  \
 103         ia64_load_scratch_fpregs(fr);                                                           \
 104         return ret;                                                                             \
 105 }
 106
 107 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                           \
 108 static efi_status_t                                                                     \
 109 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,               \
 110                        unsigned long *data_size, void *data)                            \
 111 {                                                                                       \
 112         struct ia64_fpreg fr[6];                                                        \
 113         u32 *aattr = NULL;                                                                      \
 114         efi_status_t ret;                                                               \
 115                                                                                         \
 116         if (attr)                                                                       \
 117                 aattr = adjust_arg(attr);                                               \
 118         ia64_save_scratch_fpregs(fr);                                                   \
 119         ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable),     \
 120                                 adjust_arg(name), adjust_arg(vendor), aattr,            \
 121                                 adjust_arg(data_size), adjust_arg(data));               \
 122         ia64_load_scratch_fpregs(fr);                                                   \
 123         return ret;                                                                     \
 124 }
 125
 126 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                                              \
 127 static efi_status_t                                                                             \
 128 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor)   \
 129 {                                                                                               \
 130         struct ia64_fpreg fr[6];                                                                \
 131         efi_status_t ret;                                                                       \
 132                                                                                                 \
 133         ia64_save_scratch_fpregs(fr);                                                           \
 134         ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable),   \
 135                                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));   \
 136         ia64_load_scratch_fpregs(fr);                                                           \
 137         return ret;                                                                             \
 138 }
 139
 140 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                           \
 141 static efi_status_t                                                                     \
 142 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, unsigned long attr,      \
 143                        unsigned long data_size, void *data)                             \
 144 {                                                                                       \
 145         struct ia64_fpreg fr[6];                                                        \
 146         efi_status_t ret;                                                               \
 147                                                                                         \
 148         ia64_save_scratch_fpregs(fr);                                                   \
 149         ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable),     \
 150                                 adjust_arg(name), adjust_arg(vendor), attr, data_size,  \
 151                                 adjust_arg(data));                                      \
 152         ia64_load_scratch_fpregs(fr);                                                   \
 153         return ret;                                                                     \
 154 }
 155
 156 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                                       \
 157 static efi_status_t                                                                             \
 158 prefix##_get_next_high_mono_count (u32 *count)                                                  \
 159 {                                                                                               \
 160         struct ia64_fpreg fr[6];                                                                \
 161         efi_status_t ret;                                                                       \
 162                                                                                                 \
 163         ia64_save_scratch_fpregs(fr);                                                           \
 164         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)                              \
 165                                 __va(runtime->get_next_high_mono_count), adjust_arg(count));    \
 166         ia64_load_scratch_fpregs(fr);                                                           \
 167         return ret;                                                                             \
 168 }
 169
 170 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                   \
 171 static void                                                                     \
 172 prefix##_reset_system (int reset_type, efi_status_t status,                     \
 173                        unsigned long data_size, efi_char16_t *data)             \
 174 {                                                                               \
 175         struct ia64_fpreg fr[6];                                                \
 176         efi_char16_t *adata = NULL;                                             \
 177                                                                                 \
 178         if (data)                                                               \
 179                 adata = adjust_arg(data);                                       \
 180                                                                                 \
 181         ia64_save_scratch_fpregs(fr);                                           \
 182         efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system),   \
 183                           reset_type, status, data_size, adata);                \
 184         /* should not return, but just in case... */                            \
 185         ia64_load_scratch_fpregs(fr);                                           \
 186 }
 187
 188 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 189
 190 STUB_GET_TIME(phys, phys_ptr)
 191 STUB_SET_TIME(phys, phys_ptr)
 192 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 193 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 194 STUB_GET_VARIABLE(phys, phys_ptr)
 195 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 196 STUB_SET_VARIABLE(phys, phys_ptr)
 197 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 198 STUB_RESET_SYSTEM(phys, phys_ptr)
 199
 200 #define id(arg) arg
 201
 202 STUB_GET_TIME(virt, id)
 203 STUB_SET_TIME(virt, id)
 204 STUB_GET_WAKEUP_TIME(virt, id)
 205 STUB_SET_WAKEUP_TIME(virt, id)
 206 STUB_GET_VARIABLE(virt, id)
 207 STUB_GET_NEXT_VARIABLE(virt, id)
 208 STUB_SET_VARIABLE(virt, id)
 209 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 210 STUB_RESET_SYSTEM(virt, id)
 211
 212 void
 213 efi_gettimeofday (struct timespec *ts)
 214 {
 215         efi_time_t tm;
 216
 217         memset(ts, 0, sizeof(ts));
 218         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS)
 219                 return;
 220
 221         ts->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
 222         ts->tv_nsec = tm.nanosecond;
 223 }
 224
 225 static int
 226 is_available_memory (efi_memory_desc_t *md)
 227 {
 228         if (!(md->attribute & EFI_MEMORY_WB))
 229                 return 0;
 230
 231         switch (md->type) {
 232               case EFI_LOADER_CODE:
 233               case EFI_LOADER_DATA:
 234               case EFI_BOOT_SERVICES_CODE:
 235               case EFI_BOOT_SERVICES_DATA:
 236               case EFI_CONVENTIONAL_MEMORY:
 237                 return 1;
 238         }
 239         return 0;
 240 }
 241
 242 typedef struct kern_memdesc {
 243         u64 attribute;
 244         u64 start;
 245         u64 num_pages;
 246 } kern_memdesc_t;
 247
 248 static kern_memdesc_t *kern_memmap;
 249
 250 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 251
 252 static inline u64
 253 kmd_end(kern_memdesc_t *kmd)
 254 {
 255         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 256 }
 257
 258 static inline u64
 259 efi_md_end(efi_memory_desc_t *md)
 260 {
 261         return (md->phys_addr + efi_md_size(md));
 262 }
 263
 264 static inline int
 265 efi_wb(efi_memory_desc_t *md)
 266 {
 267         return (md->attribute & EFI_MEMORY_WB);
 268 }
 269
 270 static inline int
 271 efi_uc(efi_memory_desc_t *md)
 272 {
 273         return (md->attribute & EFI_MEMORY_UC);
 274 }
 275
 276 static void
 277 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 278 {
 279         kern_memdesc_t *k;
 280         u64 start, end, voff;
 281
 282         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 283         for (k = kern_memmap; k->start != ~0UL; k++) {
 284                 if (k->attribute != attr)
 285                         continue;
 286                 start = PAGE_ALIGN(k->start);
 287                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 288                 if (start < end)
 289                         if ((*callback)(start + voff, end + voff, arg) < 0)
 290                                 return;
 291         }
 292 }
 293
 294 /*
 295  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 296  * has memory that is available for OS use.
 297  */
 298 void
 299 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 300 {
 301         walk(callback, arg, EFI_MEMORY_WB);
 302 }
 303
 304 /*
 305  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 306  * has memory that is available for uncached allocator.
 307  */
 308 void
 309 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 310 {
 311         walk(callback, arg, EFI_MEMORY_UC);
 312 }
 313
 314 /*
 315  * Look for the PAL_CODE region reported by EFI and maps it using an
 316  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 317  * Abstraction Layer chapter 11 in ADAG
 318  */
 319
 320 void *
 321 efi_get_pal_addr (void)
 322 {
 323         void *efi_map_start, *efi_map_end, *p;
 324         efi_memory_desc_t *md;
 325         u64 efi_desc_size;
 326         int pal_code_count = 0;
 327         u64 vaddr, mask;
 328
 329         efi_map_start = __va(ia64_boot_param->efi_memmap);
 330         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 331         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 332
 333         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 334                 md = p;
 335                 if (md->type != EFI_PAL_CODE)
 336                         continue;
 337
 338                 if (++pal_code_count > 1) {
 339                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
 340                                md->phys_addr);
 341                         continue;
 342                 }
 343                 /*
 344                  * The only ITLB entry in region 7 that is used is the one installed by
 345                  * __start().  That entry covers a 64MB range.
 346                  */
 347                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 348                 vaddr = PAGE_OFFSET + md->phys_addr;
 349
 350                 /*
 351                  * We must check that the PAL mapping won't overlap with the kernel
 352                  * mapping.
 353                  *
 354                  * PAL code is guaranteed to be aligned on a power of 2 between 4k and
 355                  * 256KB and that only one ITR is needed to map it. This implies that the
 356                  * PAL code is always aligned on its size, i.e., the closest matching page
 357                  * size supported by the TLB. Therefore PAL code is guaranteed never to
 358                  * cross a 64MB unless it is bigger than 64MB (very unlikely!).  So for
 359                  * now the following test is enough to determine whether or not we need a
 360                  * dedicated ITR for the PAL code.
 361                  */
 362                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 363                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 364                                __FUNCTION__);
 365                         continue;
 366                 }
 367
 368                 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
 369                         panic("Woah!  PAL code size bigger than a granule!");
 370
 371 #if EFI_DEBUG
 372                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 373
 374                 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 375                         smp_processor_id(), md->phys_addr,
 376                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 377                         vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 378 #endif
 379                 return __va(md->phys_addr);
 380         }
 381         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found",
 382                __FUNCTION__);
 383         return NULL;
 384 }
 385
 386 void
 387 efi_map_pal_code (void)
 388 {
 389         void *pal_vaddr = efi_get_pal_addr ();
 390         u64 psr;
 391
 392         if (!pal_vaddr)
 393                 return;
 394
 395         /*
 396          * Cannot write to CRx with PSR.ic=1
 397          */
 398         psr = ia64_clear_ic();
 399         ia64_itr(0x1, IA64_TR_PALCODE, GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 400                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 401                  IA64_GRANULE_SHIFT);
 402         ia64_set_psr(psr);              /* restore psr */
 403         ia64_srlz_i();
 404 }
 405
 406 void __init
 407 efi_init (void)
 408 {
 409         void *efi_map_start, *efi_map_end;
 410         efi_config_table_t *config_tables;
 411         efi_char16_t *c16;
 412         u64 efi_desc_size;
 413         char *cp, *end, vendor[100] = "unknown";
 414         extern char saved_command_line[];
 415         int i;
 416
 417         /* it's too early to be able to use the standard kernel command line support... */
 418         for (cp = saved_command_line; *cp; ) {
 419                 if (memcmp(cp, "mem=", 4) == 0) {
 420                         cp += 4;
 421                         mem_limit = memparse(cp, &end);
 422                         if (end != cp)
 423                                 break;
 424                         cp = end;
 425                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 426                         cp += 9;
 427                         max_addr = GRANULEROUNDDOWN(memparse(cp, &end));
 428                         if (end != cp)
 429                                 break;
 430                         cp = end;
 431                 } else {
 432                         while (*cp != ' ' && *cp)
 433                                 ++cp;
 434                         while (*cp == ' ')
 435                                 ++cp;
 436                 }
 437         }
 438         if (max_addr != ~0UL)
 439                 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
 440
 441         efi.systab = __va(ia64_boot_param->efi_systab);
 442
 443         /*
 444          * Verify the EFI Table
 445          */
 446         if (efi.systab == NULL)
 447                 panic("Woah! Can't find EFI system table.\n");
 448         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 449                 panic("Woah! EFI system table signature incorrect\n");
 450         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 451                 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
 452                        "got %d.%02d, expected %d.%02d\n",
 453                        efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
 454                        EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
 455
 456         config_tables = __va(efi.systab->tables);
 457
 458         /* Show what we know for posterity */
 459         c16 = __va(efi.systab->fw_vendor);
 460         if (c16) {
 461                 for (i = 0;i < (int) sizeof(vendor) && *c16; ++i)
 462                         vendor[i] = *c16++;
 463                 vendor[i] = '\0';
 464         }
 465
 466         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 467                efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
 468
 469         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 470                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 471                         efi.mps = __va(config_tables[i].table);
 472                         printk(" MPS=0x%lx", config_tables[i].table);
 473                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 474                         efi.acpi20 = __va(config_tables[i].table);
 475                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 476                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 477                         efi.acpi = __va(config_tables[i].table);
 478                         printk(" ACPI=0x%lx", config_tables[i].table);
 479                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 480                         efi.smbios = __va(config_tables[i].table);
 481                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 482                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 483                         efi.sal_systab = __va(config_tables[i].table);
 484                         printk(" SALsystab=0x%lx", config_tables[i].table);
 485                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 486                         efi.hcdp = __va(config_tables[i].table);
 487                         printk(" HCDP=0x%lx", config_tables[i].table);
 488                 }
 489         }
 490         printk("\n");
 491
 492         runtime = __va(efi.systab->runtime);
 493         efi.get_time = phys_get_time;
 494         efi.set_time = phys_set_time;
 495         efi.get_wakeup_time = phys_get_wakeup_time;
 496         efi.set_wakeup_time = phys_set_wakeup_time;
 497         efi.get_variable = phys_get_variable;
 498         efi.get_next_variable = phys_get_next_variable;
 499         efi.set_variable = phys_set_variable;
 500         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 501         efi.reset_system = phys_reset_system;
 502
 503         efi_map_start = __va(ia64_boot_param->efi_memmap);
 504         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 505         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 506
 507 #if EFI_DEBUG
 508         /* print EFI memory map: */
 509         {
 510                 efi_memory_desc_t *md;
 511                 void *p;
 512
 513                 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
 514                         md = p;
 515                         printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
 516                                i, md->type, md->attribute, md->phys_addr,
 517                                md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 518                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 519                 }
 520         }
 521 #endif
 522
 523         efi_map_pal_code();
 524         efi_enter_virtual_mode();
 525 }
 526
 527 void
 528 efi_enter_virtual_mode (void)
 529 {
 530         void *efi_map_start, *efi_map_end, *p;
 531         efi_memory_desc_t *md;
 532         efi_status_t status;
 533         u64 efi_desc_size;
 534
 535         efi_map_start = __va(ia64_boot_param->efi_memmap);
 536         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 537         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 538
 539         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 540                 md = p;
 541                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 542                         /*
 543                          * Some descriptors have multiple bits set, so the order of
 544                          * the tests is relevant.
 545                          */
 546                         if (md->attribute & EFI_MEMORY_WB) {
 547                                 md->virt_addr = (u64) __va(md->phys_addr);
 548                         } else if (md->attribute & EFI_MEMORY_UC) {
 549                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 550                         } else if (md->attribute & EFI_MEMORY_WC) {
 551 #if 0
 552                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 553                                                                            | _PAGE_D
 554                                                                            | _PAGE_MA_WC
 555                                                                            | _PAGE_PL_0
 556                                                                            | _PAGE_AR_RW));
 557 #else
 558                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 559                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 560 #endif
 561                         } else if (md->attribute & EFI_MEMORY_WT) {
 562 #if 0
 563                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 564                                                                            | _PAGE_D | _PAGE_MA_WT
 565                                                                            | _PAGE_PL_0
 566                                                                            | _PAGE_AR_RW));
 567 #else
 568                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 569                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 570 #endif
 571                         }
 572                 }
 573         }
 574
 575         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 576                                ia64_boot_param->efi_memmap_size,
 577                                efi_desc_size, ia64_boot_param->efi_memdesc_version,
 578                                ia64_boot_param->efi_memmap);
 579         if (status != EFI_SUCCESS) {
 580                 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
 581                        "(status=%lu)\n", status);
 582                 return;
 583         }
 584
 585         /*
 586          * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
 587          */
 588         efi.get_time = virt_get_time;
 589         efi.set_time = virt_set_time;
 590         efi.get_wakeup_time = virt_get_wakeup_time;
 591         efi.set_wakeup_time = virt_set_wakeup_time;
 592         efi.get_variable = virt_get_variable;
 593         efi.get_next_variable = virt_get_next_variable;
 594         efi.set_variable = virt_set_variable;
 595         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 596         efi.reset_system = virt_reset_system;
 597 }
 598
 599 /*
 600  * Walk the EFI memory map looking for the I/O port range.  There can only be one entry of
 601  * this type, other I/O port ranges should be described via ACPI.
 602  */
 603 u64
 604 efi_get_iobase (void)
 605 {
 606         void *efi_map_start, *efi_map_end, *p;
 607         efi_memory_desc_t *md;
 608         u64 efi_desc_size;
 609
 610         efi_map_start = __va(ia64_boot_param->efi_memmap);
 611         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 612         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 613
 614         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 615                 md = p;
 616                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 617                         if (md->attribute & EFI_MEMORY_UC)
 618                                 return md->phys_addr;
 619                 }
 620         }
 621         return 0;
 622 }
 623
 624 static efi_memory_desc_t *
 625 efi_memory_descriptor (unsigned long phys_addr)
 626 {
 627         void *efi_map_start, *efi_map_end, *p;
 628         efi_memory_desc_t *md;
 629         u64 efi_desc_size;
 630
 631         efi_map_start = __va(ia64_boot_param->efi_memmap);
 632         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 633         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 634
 635         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 636                 md = p;
 637
 638                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 639                          return md;
 640         }
 641         return 0;
 642 }
 643
 644 static int
 645 efi_memmap_has_mmio (void)
 646 {
 647         void *efi_map_start, *efi_map_end, *p;
 648         efi_memory_desc_t *md;
 649         u64 efi_desc_size;
 650
 651         efi_map_start = __va(ia64_boot_param->efi_memmap);
 652         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 653         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 654
 655         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 656                 md = p;
 657
 658                 if (md->type == EFI_MEMORY_MAPPED_IO)
 659                         return 1;
 660         }
 661         return 0;
 662 }
 663
 664 u32
 665 efi_mem_type (unsigned long phys_addr)
 666 {
 667         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 668
 669         if (md)
 670                 return md->type;
 671         return 0;
 672 }
 673
 674 u64
 675 efi_mem_attributes (unsigned long phys_addr)
 676 {
 677         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 678
 679         if (md)
 680                 return md->attribute;
 681         return 0;
 682 }
 683 EXPORT_SYMBOL(efi_mem_attributes);
 684
 685 /*
 686  * Determines whether the memory at phys_addr supports the desired
 687  * attribute (WB, UC, etc).  If this returns 1, the caller can safely
 688  * access *size bytes at phys_addr with the specified attribute.
 689  */
 690 static int
 691 efi_mem_attribute_range (unsigned long phys_addr, unsigned long *size, u64 attr)
 692 {
 693         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 694         unsigned long md_end;
 695
 696         if (!md || (md->attribute & attr) != attr)
 697                 return 0;
 698
 699         do {
 700                 md_end = efi_md_end(md);
 701                 if (phys_addr + *size <= md_end)
 702                         return 1;
 703
 704                 md = efi_memory_descriptor(md_end);
 705                 if (!md || (md->attribute & attr) != attr) {
 706                         *size = md_end - phys_addr;
 707                         return 1;
 708                 }
 709         } while (md);
 710         return 0;
 711 }
 712
 713 /*
 714  * For /dev/mem, we only allow read & write system calls to access
 715  * write-back memory, because read & write don't allow the user to
 716  * control access size.
 717  */
 718 int
 719 valid_phys_addr_range (unsigned long phys_addr, unsigned long *size)
 720 {
 721         return efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB);
 722 }
 723
 724 /*
 725  * We allow mmap of anything in the EFI memory map that supports
 726  * either write-back or uncacheable access.  For uncacheable regions,
 727  * the supported access sizes are system-dependent, and the user is
 728  * responsible for using the correct size.
 729  *
 730  * Note that this doesn't currently allow access to hot-added memory,
 731  * because that doesn't appear in the boot-time EFI memory map.
 732  */
 733 int
 734 valid_mmap_phys_addr_range (unsigned long phys_addr, unsigned long *size)
 735 {
 736         if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB))
 737                 return 1;
 738
 739         if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_UC))
 740                 return 1;
 741
 742         /*
 743          * Some firmware doesn't report MMIO regions in the EFI memory map.
 744          * The Intel BigSur (a.k.a. HP i2000) has this problem.  In this
 745          * case, we can't use the EFI memory map to validate mmap requests.
 746          */
 747         if (!efi_memmap_has_mmio())
 748                 return 1;
 749
 750         return 0;
 751 }
 752
 753 int __init
 754 efi_uart_console_only(void)
 755 {
 756         efi_status_t status;
 757         char *s, name[] = "ConOut";
 758         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 759         efi_char16_t *utf16, name_utf16[32];
 760         unsigned char data[1024];
 761         unsigned long size = sizeof(data);
 762         struct efi_generic_dev_path *hdr, *end_addr;
 763         int uart = 0;
 764
 765         /* Convert to UTF-16 */
 766         utf16 = name_utf16;
 767         s = name;
 768         while (*s)
 769                 *utf16++ = *s++ & 0x7f;
 770         *utf16 = 0;
 771
 772         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 773         if (status != EFI_SUCCESS) {
 774                 printk(KERN_ERR "No EFI %s variable?\n", name);
 775                 return 0;
 776         }
 777
 778         hdr = (struct efi_generic_dev_path *) data;
 779         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 780         while (hdr < end_addr) {
 781                 if (hdr->type == EFI_DEV_MSG &&
 782                     hdr->sub_type == EFI_DEV_MSG_UART)
 783                         uart = 1;
 784                 else if (hdr->type == EFI_DEV_END_PATH ||
 785                           hdr->type == EFI_DEV_END_PATH2) {
 786                         if (!uart)
 787                                 return 0;
 788                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 789                                 return 1;
 790                         uart = 0;
 791                 }
 792                 hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
 793         }
 794         printk(KERN_ERR "Malformed %s value\n", name);
 795         return 0;
 796 }
 797
 798 /*
 799  * Look for the first granule aligned memory descriptor memory
 800  * that is big enough to hold EFI memory map. Make sure this
 801  * descriptor is atleast granule sized so it does not get trimmed
 802  */
 803 struct kern_memdesc *
 804 find_memmap_space (void)
 805 {
 806         u64     contig_low=0, contig_high=0;
 807         u64     as = 0, ae;
 808         void *efi_map_start, *efi_map_end, *p, *q;
 809         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 810         u64     space_needed, efi_desc_size;
 811         unsigned long total_mem = 0;
 812
 813         efi_map_start = __va(ia64_boot_param->efi_memmap);
 814         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 815         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 816
 817         /*
 818          * Worst case: we need 3 kernel descriptors for each efi descriptor
 819          * (if every entry has a WB part in the middle, and UC head and tail),
 820          * plus one for the end marker.
 821          */
 822         space_needed = sizeof(kern_memdesc_t) *
 823                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 824
 825         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 826                 md = p;
 827                 if (!efi_wb(md)) {
 828                         continue;
 829                 }
 830                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 831                         contig_low = GRANULEROUNDUP(md->phys_addr);
 832                         contig_high = efi_md_end(md);
 833                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 834                                 check_md = q;
 835                                 if (!efi_wb(check_md))
 836                                         break;
 837                                 if (contig_high != check_md->phys_addr)
 838                                         break;
 839                                 contig_high = efi_md_end(check_md);
 840                         }
 841                         contig_high = GRANULEROUNDDOWN(contig_high);
 842                 }
 843                 if (!is_available_memory(md) || md->type == EFI_LOADER_DATA)
 844                         continue;
 845
 846                 /* Round ends inward to granule boundaries */
 847                 as = max(contig_low, md->phys_addr);
 848                 ae = min(contig_high, efi_md_end(md));
 849
 850                 /* keep within max_addr= command line arg */
 851                 ae = min(ae, max_addr);
 852                 if (ae <= as)
 853                         continue;
 854
 855                 /* avoid going over mem= command line arg */
 856                 if (total_mem + (ae - as) > mem_limit)
 857                         ae -= total_mem + (ae - as) - mem_limit;
 858
 859                 if (ae <= as)
 860                         continue;
 861
 862                 if (ae - as > space_needed)
 863                         break;
 864         }
 865         if (p >= efi_map_end)
 866                 panic("Can't allocate space for kernel memory descriptors");
 867
 868         return __va(as);
 869 }
 870
 871 /*
 872  * Walk the EFI memory map and gather all memory available for kernel
 873  * to use.  We can allocate partial granules only if the unavailable
 874  * parts exist, and are WB.
 875  */
 876 void
 877 efi_memmap_init(unsigned long *s, unsigned long *e)
 878 {
 879         struct kern_memdesc *k, *prev = 0;
 880         u64     contig_low=0, contig_high=0;
 881         u64     as, ae, lim;
 882         void *efi_map_start, *efi_map_end, *p, *q;
 883         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 884         u64     efi_desc_size;
 885         unsigned long total_mem = 0;
 886
 887         k = kern_memmap = find_memmap_space();
 888
 889         efi_map_start = __va(ia64_boot_param->efi_memmap);
 890         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 891         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 892
 893         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 894                 md = p;
 895                 if (!efi_wb(md)) {
 896                         if (efi_uc(md) && (md->type == EFI_CONVENTIONAL_MEMORY ||
 897                                            md->type == EFI_BOOT_SERVICES_DATA)) {
 898                                 k->attribute = EFI_MEMORY_UC;
 899                                 k->start = md->phys_addr;
 900                                 k->num_pages = md->num_pages;
 901                                 k++;
 902                         }
 903                         continue;
 904                 }
 905                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 906                         contig_low = GRANULEROUNDUP(md->phys_addr);
 907                         contig_high = efi_md_end(md);
 908                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 909                                 check_md = q;
 910                                 if (!efi_wb(check_md))
 911                                         break;
 912                                 if (contig_high != check_md->phys_addr)
 913                                         break;
 914                                 contig_high = efi_md_end(check_md);
 915                         }
 916                         contig_high = GRANULEROUNDDOWN(contig_high);
 917                 }
 918                 if (!is_available_memory(md))
 919                         continue;
 920
 921                 /*
 922                  * Round ends inward to granule boundaries
 923                  * Give trimmings to uncached allocator
 924                  */
 925                 if (md->phys_addr < contig_low) {
 926                         lim = min(efi_md_end(md), contig_low);
 927                         if (efi_uc(md)) {
 928                                 if (k > kern_memmap && (k-1)->attribute == EFI_MEMORY_UC &&
 929                                     kmd_end(k-1) == md->phys_addr) {
 930                                         (k-1)->num_pages += (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
 931                                 } else {
 932                                         k->attribute = EFI_MEMORY_UC;
 933                                         k->start = md->phys_addr;
 934                                         k->num_pages = (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
 935                                         k++;
 936                                 }
 937                         }
 938                         as = contig_low;
 939                 } else
 940                         as = md->phys_addr;
 941
 942                 if (efi_md_end(md) > contig_high) {
 943                         lim = max(md->phys_addr, contig_high);
 944                         if (efi_uc(md)) {
 945                                 if (lim == md->phys_addr && k > kern_memmap &&
 946                                     (k-1)->attribute == EFI_MEMORY_UC &&
 947                                     kmd_end(k-1) == md->phys_addr) {
 948                                         (k-1)->num_pages += md->num_pages;
 949                                 } else {
 950                                         k->attribute = EFI_MEMORY_UC;
 951                                         k->start = lim;
 952                                         k->num_pages = (efi_md_end(md) - lim) >> EFI_PAGE_SHIFT;
 953                                         k++;
 954                                 }
 955                         }
 956                         ae = contig_high;
 957                 } else
 958                         ae = efi_md_end(md);
 959
 960                 /* keep within max_addr= command line arg */
 961                 ae = min(ae, max_addr);
 962                 if (ae <= as)
 963                         continue;
 964
 965                 /* avoid going over mem= command line arg */
 966                 if (total_mem + (ae - as) > mem_limit)
 967                         ae -= total_mem + (ae - as) - mem_limit;
 968
 969                 if (ae <= as)
 970                         continue;
 971                 if (prev && kmd_end(prev) == md->phys_addr) {
 972                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
 973                         total_mem += ae - as;
 974                         continue;
 975                 }
 976                 k->attribute = EFI_MEMORY_WB;
 977                 k->start = as;
 978                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
 979                 total_mem += ae - as;
 980                 prev = k++;
 981         }
 982         k->start = ~0L; /* end-marker */
 983
 984         /* reserve the memory we are using for kern_memmap */
 985         *s = (u64)kern_memmap;
 986         *e = (u64)++k;
 987 }
 988
 989 void
 990 efi_initialize_iomem_resources(struct resource *code_resource,
 991                                struct resource *data_resource)
 992 {
 993         struct resource *res;
 994         void *efi_map_start, *efi_map_end, *p;
 995         efi_memory_desc_t *md;
 996         u64 efi_desc_size;
 997         char *name;
 998         unsigned long flags;
 999
1000         efi_map_start = __va(ia64_boot_param->efi_memmap);
1001         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1002         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1003
1004         res = NULL;
1005
1006         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1007                 md = p;
1008
1009                 if (md->num_pages == 0) /* should not happen */
1010                         continue;
1011
1012                 flags = IORESOURCE_MEM;
1013                 switch (md->type) {
1014
1015                         case EFI_MEMORY_MAPPED_IO:
1016                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1017                                 continue;
1018
1019                         case EFI_LOADER_CODE:
1020                         case EFI_LOADER_DATA:
1021                         case EFI_BOOT_SERVICES_DATA:
1022                         case EFI_BOOT_SERVICES_CODE:
1023                         case EFI_CONVENTIONAL_MEMORY:
1024                                 if (md->attribute & EFI_MEMORY_WP) {
1025                                         name = "System ROM";
1026                                         flags |= IORESOURCE_READONLY;
1027                                 } else {
1028                                         name = "System RAM";
1029                                 }
1030                                 break;
1031
1032                         case EFI_ACPI_MEMORY_NVS:
1033                                 name = "ACPI Non-volatile Storage";
1034                                 flags |= IORESOURCE_BUSY;
1035                                 break;
1036
1037                         case EFI_UNUSABLE_MEMORY:
1038                                 name = "reserved";
1039                                 flags |= IORESOURCE_BUSY | IORESOURCE_DISABLED;
1040                                 break;
1041
1042                         case EFI_RESERVED_TYPE:
1043                         case EFI_RUNTIME_SERVICES_CODE:
1044                         case EFI_RUNTIME_SERVICES_DATA:
1045                         case EFI_ACPI_RECLAIM_MEMORY:
1046                         default:
1047                                 name = "reserved";
1048                                 flags |= IORESOURCE_BUSY;
1049                                 break;
1050                 }
1051
1052                 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
1053                         printk(KERN_ERR "failed to alocate resource for iomem\n");
1054                         return;
1055                 }
1056
1057                 res->name = name;
1058                 res->start = md->phys_addr;
1059                 res->end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
1060                 res->flags = flags;
1061
1062                 if (insert_resource(&iomem_resource, res) < 0)
1063                         kfree(res);
1064                 else {
1065                         /*
1066                          * We don't know which region contains
1067                          * kernel data so we try it repeatedly and
1068                          * let the resource manager test it.
1069                          */
1070                         insert_resource(res, code_resource);
1071                         insert_resource(res, data_resource);
1072                 }
1073         }
1074 }