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, 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                         mem_limit = memparse(cp + 4, &cp);
 421                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 422                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 423                 } else {
 424                         while (*cp != ' ' && *cp)
 425                                 ++cp;
 426                         while (*cp == ' ')
 427                                 ++cp;
 428                 }
 429         }
 430         if (max_addr != ~0UL)
 431                 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
 432
 433         efi.systab = __va(ia64_boot_param->efi_systab);
 434
 435         /*
 436          * Verify the EFI Table
 437          */
 438         if (efi.systab == NULL)
 439                 panic("Woah! Can't find EFI system table.\n");
 440         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 441                 panic("Woah! EFI system table signature incorrect\n");
 442         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 443                 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
 444                        "got %d.%02d, expected %d.%02d\n",
 445                        efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
 446                        EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
 447
 448         config_tables = __va(efi.systab->tables);
 449
 450         /* Show what we know for posterity */
 451         c16 = __va(efi.systab->fw_vendor);
 452         if (c16) {
 453                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
 454                         vendor[i] = *c16++;
 455                 vendor[i] = '\0';
 456         }
 457
 458         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 459                efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
 460
 461         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 462                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 463                         efi.mps = __va(config_tables[i].table);
 464                         printk(" MPS=0x%lx", config_tables[i].table);
 465                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 466                         efi.acpi20 = __va(config_tables[i].table);
 467                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 468                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 469                         efi.acpi = __va(config_tables[i].table);
 470                         printk(" ACPI=0x%lx", config_tables[i].table);
 471                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 472                         efi.smbios = __va(config_tables[i].table);
 473                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 474                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 475                         efi.sal_systab = __va(config_tables[i].table);
 476                         printk(" SALsystab=0x%lx", config_tables[i].table);
 477                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 478                         efi.hcdp = __va(config_tables[i].table);
 479                         printk(" HCDP=0x%lx", config_tables[i].table);
 480                 }
 481         }
 482         printk("\n");
 483
 484         runtime = __va(efi.systab->runtime);
 485         efi.get_time = phys_get_time;
 486         efi.set_time = phys_set_time;
 487         efi.get_wakeup_time = phys_get_wakeup_time;
 488         efi.set_wakeup_time = phys_set_wakeup_time;
 489         efi.get_variable = phys_get_variable;
 490         efi.get_next_variable = phys_get_next_variable;
 491         efi.set_variable = phys_set_variable;
 492         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 493         efi.reset_system = phys_reset_system;
 494
 495         efi_map_start = __va(ia64_boot_param->efi_memmap);
 496         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 497         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 498
 499 #if EFI_DEBUG
 500         /* print EFI memory map: */
 501         {
 502                 efi_memory_desc_t *md;
 503                 void *p;
 504
 505                 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
 506                         md = p;
 507                         printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
 508                                i, md->type, md->attribute, md->phys_addr,
 509                                md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 510                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 511                 }
 512         }
 513 #endif
 514
 515         efi_map_pal_code();
 516         efi_enter_virtual_mode();
 517 }
 518
 519 void
 520 efi_enter_virtual_mode (void)
 521 {
 522         void *efi_map_start, *efi_map_end, *p;
 523         efi_memory_desc_t *md;
 524         efi_status_t status;
 525         u64 efi_desc_size;
 526
 527         efi_map_start = __va(ia64_boot_param->efi_memmap);
 528         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 529         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 530
 531         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 532                 md = p;
 533                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 534                         /*
 535                          * Some descriptors have multiple bits set, so the order of
 536                          * the tests is relevant.
 537                          */
 538                         if (md->attribute & EFI_MEMORY_WB) {
 539                                 md->virt_addr = (u64) __va(md->phys_addr);
 540                         } else if (md->attribute & EFI_MEMORY_UC) {
 541                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 542                         } else if (md->attribute & EFI_MEMORY_WC) {
 543 #if 0
 544                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 545                                                                            | _PAGE_D
 546                                                                            | _PAGE_MA_WC
 547                                                                            | _PAGE_PL_0
 548                                                                            | _PAGE_AR_RW));
 549 #else
 550                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 551                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 552 #endif
 553                         } else if (md->attribute & EFI_MEMORY_WT) {
 554 #if 0
 555                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 556                                                                            | _PAGE_D | _PAGE_MA_WT
 557                                                                            | _PAGE_PL_0
 558                                                                            | _PAGE_AR_RW));
 559 #else
 560                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 561                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 562 #endif
 563                         }
 564                 }
 565         }
 566
 567         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 568                                ia64_boot_param->efi_memmap_size,
 569                                efi_desc_size, ia64_boot_param->efi_memdesc_version,
 570                                ia64_boot_param->efi_memmap);
 571         if (status != EFI_SUCCESS) {
 572                 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
 573                        "(status=%lu)\n", status);
 574                 return;
 575         }
 576
 577         /*
 578          * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
 579          */
 580         efi.get_time = virt_get_time;
 581         efi.set_time = virt_set_time;
 582         efi.get_wakeup_time = virt_get_wakeup_time;
 583         efi.set_wakeup_time = virt_set_wakeup_time;
 584         efi.get_variable = virt_get_variable;
 585         efi.get_next_variable = virt_get_next_variable;
 586         efi.set_variable = virt_set_variable;
 587         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 588         efi.reset_system = virt_reset_system;
 589 }
 590
 591 /*
 592  * Walk the EFI memory map looking for the I/O port range.  There can only be one entry of
 593  * this type, other I/O port ranges should be described via ACPI.
 594  */
 595 u64
 596 efi_get_iobase (void)
 597 {
 598         void *efi_map_start, *efi_map_end, *p;
 599         efi_memory_desc_t *md;
 600         u64 efi_desc_size;
 601
 602         efi_map_start = __va(ia64_boot_param->efi_memmap);
 603         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 604         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 605
 606         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 607                 md = p;
 608                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 609                         if (md->attribute & EFI_MEMORY_UC)
 610                                 return md->phys_addr;
 611                 }
 612         }
 613         return 0;
 614 }
 615
 616 static efi_memory_desc_t *
 617 efi_memory_descriptor (unsigned long phys_addr)
 618 {
 619         void *efi_map_start, *efi_map_end, *p;
 620         efi_memory_desc_t *md;
 621         u64 efi_desc_size;
 622
 623         efi_map_start = __va(ia64_boot_param->efi_memmap);
 624         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 625         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 626
 627         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 628                 md = p;
 629
 630                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 631                          return md;
 632         }
 633         return 0;
 634 }
 635
 636 static int
 637 efi_memmap_has_mmio (void)
 638 {
 639         void *efi_map_start, *efi_map_end, *p;
 640         efi_memory_desc_t *md;
 641         u64 efi_desc_size;
 642
 643         efi_map_start = __va(ia64_boot_param->efi_memmap);
 644         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 645         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 646
 647         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 648                 md = p;
 649
 650                 if (md->type == EFI_MEMORY_MAPPED_IO)
 651                         return 1;
 652         }
 653         return 0;
 654 }
 655
 656 u32
 657 efi_mem_type (unsigned long phys_addr)
 658 {
 659         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 660
 661         if (md)
 662                 return md->type;
 663         return 0;
 664 }
 665
 666 u64
 667 efi_mem_attributes (unsigned long phys_addr)
 668 {
 669         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 670
 671         if (md)
 672                 return md->attribute;
 673         return 0;
 674 }
 675 EXPORT_SYMBOL(efi_mem_attributes);
 676
 677 /*
 678  * Determines whether the memory at phys_addr supports the desired
 679  * attribute (WB, UC, etc).  If this returns 1, the caller can safely
 680  * access *size bytes at phys_addr with the specified attribute.
 681  */
 682 static int
 683 efi_mem_attribute_range (unsigned long phys_addr, unsigned long *size, u64 attr)
 684 {
 685         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 686         unsigned long md_end;
 687
 688         if (!md || (md->attribute & attr) != attr)
 689                 return 0;
 690
 691         do {
 692                 md_end = efi_md_end(md);
 693                 if (phys_addr + *size <= md_end)
 694                         return 1;
 695
 696                 md = efi_memory_descriptor(md_end);
 697                 if (!md || (md->attribute & attr) != attr) {
 698                         *size = md_end - phys_addr;
 699                         return 1;
 700                 }
 701         } while (md);
 702         return 0;
 703 }
 704
 705 /*
 706  * For /dev/mem, we only allow read & write system calls to access
 707  * write-back memory, because read & write don't allow the user to
 708  * control access size.
 709  */
 710 int
 711 valid_phys_addr_range (unsigned long phys_addr, unsigned long *size)
 712 {
 713         return efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB);
 714 }
 715
 716 /*
 717  * We allow mmap of anything in the EFI memory map that supports
 718  * either write-back or uncacheable access.  For uncacheable regions,
 719  * the supported access sizes are system-dependent, and the user is
 720  * responsible for using the correct size.
 721  *
 722  * Note that this doesn't currently allow access to hot-added memory,
 723  * because that doesn't appear in the boot-time EFI memory map.
 724  */
 725 int
 726 valid_mmap_phys_addr_range (unsigned long phys_addr, unsigned long *size)
 727 {
 728         if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB))
 729                 return 1;
 730
 731         if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_UC))
 732                 return 1;
 733
 734         /*
 735          * Some firmware doesn't report MMIO regions in the EFI memory map.
 736          * The Intel BigSur (a.k.a. HP i2000) has this problem.  In this
 737          * case, we can't use the EFI memory map to validate mmap requests.
 738          */
 739         if (!efi_memmap_has_mmio())
 740                 return 1;
 741
 742         return 0;
 743 }
 744
 745 int __init
 746 efi_uart_console_only(void)
 747 {
 748         efi_status_t status;
 749         char *s, name[] = "ConOut";
 750         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 751         efi_char16_t *utf16, name_utf16[32];
 752         unsigned char data[1024];
 753         unsigned long size = sizeof(data);
 754         struct efi_generic_dev_path *hdr, *end_addr;
 755         int uart = 0;
 756
 757         /* Convert to UTF-16 */
 758         utf16 = name_utf16;
 759         s = name;
 760         while (*s)
 761                 *utf16++ = *s++ & 0x7f;
 762         *utf16 = 0;
 763
 764         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 765         if (status != EFI_SUCCESS) {
 766                 printk(KERN_ERR "No EFI %s variable?\n", name);
 767                 return 0;
 768         }
 769
 770         hdr = (struct efi_generic_dev_path *) data;
 771         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 772         while (hdr < end_addr) {
 773                 if (hdr->type == EFI_DEV_MSG &&
 774                     hdr->sub_type == EFI_DEV_MSG_UART)
 775                         uart = 1;
 776                 else if (hdr->type == EFI_DEV_END_PATH ||
 777                           hdr->type == EFI_DEV_END_PATH2) {
 778                         if (!uart)
 779                                 return 0;
 780                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 781                                 return 1;
 782                         uart = 0;
 783                 }
 784                 hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
 785         }
 786         printk(KERN_ERR "Malformed %s value\n", name);
 787         return 0;
 788 }
 789
 790 /*
 791  * Look for the first granule aligned memory descriptor memory
 792  * that is big enough to hold EFI memory map. Make sure this
 793  * descriptor is atleast granule sized so it does not get trimmed
 794  */
 795 struct kern_memdesc *
 796 find_memmap_space (void)
 797 {
 798         u64     contig_low=0, contig_high=0;
 799         u64     as = 0, ae;
 800         void *efi_map_start, *efi_map_end, *p, *q;
 801         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 802         u64     space_needed, efi_desc_size;
 803         unsigned long total_mem = 0;
 804
 805         efi_map_start = __va(ia64_boot_param->efi_memmap);
 806         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 807         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 808
 809         /*
 810          * Worst case: we need 3 kernel descriptors for each efi descriptor
 811          * (if every entry has a WB part in the middle, and UC head and tail),
 812          * plus one for the end marker.
 813          */
 814         space_needed = sizeof(kern_memdesc_t) *
 815                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 816
 817         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 818                 md = p;
 819                 if (!efi_wb(md)) {
 820                         continue;
 821                 }
 822                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 823                         contig_low = GRANULEROUNDUP(md->phys_addr);
 824                         contig_high = efi_md_end(md);
 825                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 826                                 check_md = q;
 827                                 if (!efi_wb(check_md))
 828                                         break;
 829                                 if (contig_high != check_md->phys_addr)
 830                                         break;
 831                                 contig_high = efi_md_end(check_md);
 832                         }
 833                         contig_high = GRANULEROUNDDOWN(contig_high);
 834                 }
 835                 if (!is_available_memory(md) || md->type == EFI_LOADER_DATA)
 836                         continue;
 837
 838                 /* Round ends inward to granule boundaries */
 839                 as = max(contig_low, md->phys_addr);
 840                 ae = min(contig_high, efi_md_end(md));
 841
 842                 /* keep within max_addr= command line arg */
 843                 ae = min(ae, max_addr);
 844                 if (ae <= as)
 845                         continue;
 846
 847                 /* avoid going over mem= command line arg */
 848                 if (total_mem + (ae - as) > mem_limit)
 849                         ae -= total_mem + (ae - as) - mem_limit;
 850
 851                 if (ae <= as)
 852                         continue;
 853
 854                 if (ae - as > space_needed)
 855                         break;
 856         }
 857         if (p >= efi_map_end)
 858                 panic("Can't allocate space for kernel memory descriptors");
 859
 860         return __va(as);
 861 }
 862
 863 /*
 864  * Walk the EFI memory map and gather all memory available for kernel
 865  * to use.  We can allocate partial granules only if the unavailable
 866  * parts exist, and are WB.
 867  */
 868 void
 869 efi_memmap_init(unsigned long *s, unsigned long *e)
 870 {
 871         struct kern_memdesc *k, *prev = 0;
 872         u64     contig_low=0, contig_high=0;
 873         u64     as, ae, lim;
 874         void *efi_map_start, *efi_map_end, *p, *q;
 875         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 876         u64     efi_desc_size;
 877         unsigned long total_mem = 0;
 878
 879         k = kern_memmap = find_memmap_space();
 880
 881         efi_map_start = __va(ia64_boot_param->efi_memmap);
 882         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 883         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 884
 885         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 886                 md = p;
 887                 if (!efi_wb(md)) {
 888                         if (efi_uc(md) && (md->type == EFI_CONVENTIONAL_MEMORY ||
 889                                            md->type == EFI_BOOT_SERVICES_DATA)) {
 890                                 k->attribute = EFI_MEMORY_UC;
 891                                 k->start = md->phys_addr;
 892                                 k->num_pages = md->num_pages;
 893                                 k++;
 894                         }
 895                         continue;
 896                 }
 897                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 898                         contig_low = GRANULEROUNDUP(md->phys_addr);
 899                         contig_high = efi_md_end(md);
 900                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 901                                 check_md = q;
 902                                 if (!efi_wb(check_md))
 903                                         break;
 904                                 if (contig_high != check_md->phys_addr)
 905                                         break;
 906                                 contig_high = efi_md_end(check_md);
 907                         }
 908                         contig_high = GRANULEROUNDDOWN(contig_high);
 909                 }
 910                 if (!is_available_memory(md))
 911                         continue;
 912
 913                 /*
 914                  * Round ends inward to granule boundaries
 915                  * Give trimmings to uncached allocator
 916                  */
 917                 if (md->phys_addr < contig_low) {
 918                         lim = min(efi_md_end(md), contig_low);
 919                         if (efi_uc(md)) {
 920                                 if (k > kern_memmap && (k-1)->attribute == EFI_MEMORY_UC &&
 921                                     kmd_end(k-1) == md->phys_addr) {
 922                                         (k-1)->num_pages += (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
 923                                 } else {
 924                                         k->attribute = EFI_MEMORY_UC;
 925                                         k->start = md->phys_addr;
 926                                         k->num_pages = (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
 927                                         k++;
 928                                 }
 929                         }
 930                         as = contig_low;
 931                 } else
 932                         as = md->phys_addr;
 933
 934                 if (efi_md_end(md) > contig_high) {
 935                         lim = max(md->phys_addr, contig_high);
 936                         if (efi_uc(md)) {
 937                                 if (lim == md->phys_addr && k > kern_memmap &&
 938                                     (k-1)->attribute == EFI_MEMORY_UC &&
 939                                     kmd_end(k-1) == md->phys_addr) {
 940                                         (k-1)->num_pages += md->num_pages;
 941                                 } else {
 942                                         k->attribute = EFI_MEMORY_UC;
 943                                         k->start = lim;
 944                                         k->num_pages = (efi_md_end(md) - lim) >> EFI_PAGE_SHIFT;
 945                                         k++;
 946                                 }
 947                         }
 948                         ae = contig_high;
 949                 } else
 950                         ae = efi_md_end(md);
 951
 952                 /* keep within max_addr= command line arg */
 953                 ae = min(ae, max_addr);
 954                 if (ae <= as)
 955                         continue;
 956
 957                 /* avoid going over mem= command line arg */
 958                 if (total_mem + (ae - as) > mem_limit)
 959                         ae -= total_mem + (ae - as) - mem_limit;
 960
 961                 if (ae <= as)
 962                         continue;
 963                 if (prev && kmd_end(prev) == md->phys_addr) {
 964                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
 965                         total_mem += ae - as;
 966                         continue;
 967                 }
 968                 k->attribute = EFI_MEMORY_WB;
 969                 k->start = as;
 970                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
 971                 total_mem += ae - as;
 972                 prev = k++;
 973         }
 974         k->start = ~0L; /* end-marker */
 975
 976         /* reserve the memory we are using for kern_memmap */
 977         *s = (u64)kern_memmap;
 978         *e = (u64)++k;
 979 }
 980
 981 void
 982 efi_initialize_iomem_resources(struct resource *code_resource,
 983                                struct resource *data_resource)
 984 {
 985         struct resource *res;
 986         void *efi_map_start, *efi_map_end, *p;
 987         efi_memory_desc_t *md;
 988         u64 efi_desc_size;
 989         char *name;
 990         unsigned long flags;
 991
 992         efi_map_start = __va(ia64_boot_param->efi_memmap);
 993         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 994         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 995
 996         res = NULL;
 997
 998         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 999                 md = p;
1000
1001                 if (md->num_pages == 0) /* should not happen */
1002                         continue;
1003
1004                 flags = IORESOURCE_MEM;
1005                 switch (md->type) {
1006
1007                         case EFI_MEMORY_MAPPED_IO:
1008                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1009                                 continue;
1010
1011                         case EFI_LOADER_CODE:
1012                         case EFI_LOADER_DATA:
1013                         case EFI_BOOT_SERVICES_DATA:
1014                         case EFI_BOOT_SERVICES_CODE:
1015                         case EFI_CONVENTIONAL_MEMORY:
1016                                 if (md->attribute & EFI_MEMORY_WP) {
1017                                         name = "System ROM";
1018                                         flags |= IORESOURCE_READONLY;
1019                                 } else {
1020                                         name = "System RAM";
1021                                 }
1022                                 break;
1023
1024                         case EFI_ACPI_MEMORY_NVS:
1025                                 name = "ACPI Non-volatile Storage";
1026                                 flags |= IORESOURCE_BUSY;
1027                                 break;
1028
1029                         case EFI_UNUSABLE_MEMORY:
1030                                 name = "reserved";
1031                                 flags |= IORESOURCE_BUSY | IORESOURCE_DISABLED;
1032                                 break;
1033
1034                         case EFI_RESERVED_TYPE:
1035                         case EFI_RUNTIME_SERVICES_CODE:
1036                         case EFI_RUNTIME_SERVICES_DATA:
1037                         case EFI_ACPI_RECLAIM_MEMORY:
1038                         default:
1039                                 name = "reserved";
1040                                 flags |= IORESOURCE_BUSY;
1041                                 break;
1042                 }
1043
1044                 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
1045                         printk(KERN_ERR "failed to alocate resource for iomem\n");
1046                         return;
1047                 }
1048
1049                 res->name = name;
1050                 res->start = md->phys_addr;
1051                 res->end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
1052                 res->flags = flags;
1053
1054                 if (insert_resource(&iomem_resource, res) < 0)
1055                         kfree(res);
1056                 else {
1057                         /*
1058                          * We don't know which region contains
1059                          * kernel data so we try it repeatedly and
1060                          * let the resource manager test it.
1061                          */
1062                         insert_resource(res, code_resource);
1063                         insert_resource(res, data_resource);
1064                 }
1065         }
1066 }