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Linux/arch/ia64/kernel/efi.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Extensible Firmware Interface
  4  *
  5  * Based on Extensible Firmware Interface Specification version 0.9
  6  * April 30, 1999
  7  *
  8  * Copyright (C) 1999 VA Linux Systems
  9  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 10  * Copyright (C) 1999-2003 Hewlett-Packard Co.
 11  *      David Mosberger-Tang <davidm@hpl.hp.com>
 12  *      Stephane Eranian <eranian@hpl.hp.com>
 13  * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
 14  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
 15  *
 16  * All EFI Runtime Services are not implemented yet as EFI only
 17  * supports physical mode addressing on SoftSDV. This is to be fixed
 18  * in a future version.  --drummond 1999-07-20
 19  *
 20  * Implemented EFI runtime services and virtual mode calls.  --davidm
 21  *
 22  * Goutham Rao: <goutham.rao@intel.com>
 23  *      Skip non-WB memory and ignore empty memory ranges.
 24  */
 25 #include <linux/module.h>
 26 #include <linux/memblock.h>
 27 #include <linux/crash_dump.h>
 28 #include <linux/kernel.h>
 29 #include <linux/init.h>
 30 #include <linux/types.h>
 31 #include <linux/slab.h>
 32 #include <linux/time.h>
 33 #include <linux/efi.h>
 34 #include <linux/kexec.h>
 35 #include <linux/mm.h>
 36 
 37 #include <asm/io.h>
 38 #include <asm/kregs.h>
 39 #include <asm/meminit.h>
 40 #include <asm/pgtable.h>
 41 #include <asm/processor.h>
 42 #include <asm/mca.h>
 43 #include <asm/setup.h>
 44 #include <asm/tlbflush.h>
 45 
 46 #define EFI_DEBUG       0
 47 
 48 static __initdata unsigned long palo_phys;
 49 
 50 static __initdata efi_config_table_type_t arch_tables[] = {
 51         {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, "PALO", &palo_phys},
 52         {NULL_GUID, NULL, 0},
 53 };
 54 
 55 extern efi_status_t efi_call_phys (void *, ...);
 56 
 57 static efi_runtime_services_t *runtime;
 58 static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
 59 
 60 #define efi_call_virt(f, args...)       (*(f))(args)
 61 
 62 #define STUB_GET_TIME(prefix, adjust_arg)                                      \
 63 static efi_status_t                                                            \
 64 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                         \
 65 {                                                                              \
 66         struct ia64_fpreg fr[6];                                               \
 67         efi_time_cap_t *atc = NULL;                                            \
 68         efi_status_t ret;                                                      \
 69                                                                                \
 70         if (tc)                                                                \
 71                 atc = adjust_arg(tc);                                          \
 72         ia64_save_scratch_fpregs(fr);                                          \
 73         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time),    \
 74                                 adjust_arg(tm), atc);                          \
 75         ia64_load_scratch_fpregs(fr);                                          \
 76         return ret;                                                            \
 77 }
 78 
 79 #define STUB_SET_TIME(prefix, adjust_arg)                                      \
 80 static efi_status_t                                                            \
 81 prefix##_set_time (efi_time_t *tm)                                             \
 82 {                                                                              \
 83         struct ia64_fpreg fr[6];                                               \
 84         efi_status_t ret;                                                      \
 85                                                                                \
 86         ia64_save_scratch_fpregs(fr);                                          \
 87         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time),    \
 88                                 adjust_arg(tm));                               \
 89         ia64_load_scratch_fpregs(fr);                                          \
 90         return ret;                                                            \
 91 }
 92 
 93 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                               \
 94 static efi_status_t                                                            \
 95 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending,            \
 96                           efi_time_t *tm)                                      \
 97 {                                                                              \
 98         struct ia64_fpreg fr[6];                                               \
 99         efi_status_t ret;                                                      \
100                                                                                \
101         ia64_save_scratch_fpregs(fr);                                          \
102         ret = efi_call_##prefix(                                               \
103                 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),      \
104                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));     \
105         ia64_load_scratch_fpregs(fr);                                          \
106         return ret;                                                            \
107 }
108 
109 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                               \
110 static efi_status_t                                                            \
111 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                  \
112 {                                                                              \
113         struct ia64_fpreg fr[6];                                               \
114         efi_time_t *atm = NULL;                                                \
115         efi_status_t ret;                                                      \
116                                                                                \
117         if (tm)                                                                \
118                 atm = adjust_arg(tm);                                          \
119         ia64_save_scratch_fpregs(fr);                                          \
120         ret = efi_call_##prefix(                                               \
121                 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),      \
122                 enabled, atm);                                                 \
123         ia64_load_scratch_fpregs(fr);                                          \
124         return ret;                                                            \
125 }
126 
127 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                  \
128 static efi_status_t                                                            \
129 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,      \
130                        unsigned long *data_size, void *data)                   \
131 {                                                                              \
132         struct ia64_fpreg fr[6];                                               \
133         u32 *aattr = NULL;                                                     \
134         efi_status_t ret;                                                      \
135                                                                                \
136         if (attr)                                                              \
137                 aattr = adjust_arg(attr);                                      \
138         ia64_save_scratch_fpregs(fr);                                          \
139         ret = efi_call_##prefix(                                               \
140                 (efi_get_variable_t *) __va(runtime->get_variable),            \
141                 adjust_arg(name), adjust_arg(vendor), aattr,                   \
142                 adjust_arg(data_size), adjust_arg(data));                      \
143         ia64_load_scratch_fpregs(fr);                                          \
144         return ret;                                                            \
145 }
146 
147 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                             \
148 static efi_status_t                                                            \
149 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name,      \
150                             efi_guid_t *vendor)                                \
151 {                                                                              \
152         struct ia64_fpreg fr[6];                                               \
153         efi_status_t ret;                                                      \
154                                                                                \
155         ia64_save_scratch_fpregs(fr);                                          \
156         ret = efi_call_##prefix(                                               \
157                 (efi_get_next_variable_t *) __va(runtime->get_next_variable),  \
158                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));  \
159         ia64_load_scratch_fpregs(fr);                                          \
160         return ret;                                                            \
161 }
162 
163 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                  \
164 static efi_status_t                                                            \
165 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor,                 \
166                        u32 attr, unsigned long data_size,                      \
167                        void *data)                                             \
168 {                                                                              \
169         struct ia64_fpreg fr[6];                                               \
170         efi_status_t ret;                                                      \
171                                                                                \
172         ia64_save_scratch_fpregs(fr);                                          \
173         ret = efi_call_##prefix(                                               \
174                 (efi_set_variable_t *) __va(runtime->set_variable),            \
175                 adjust_arg(name), adjust_arg(vendor), attr, data_size,         \
176                 adjust_arg(data));                                             \
177         ia64_load_scratch_fpregs(fr);                                          \
178         return ret;                                                            \
179 }
180 
181 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                      \
182 static efi_status_t                                                            \
183 prefix##_get_next_high_mono_count (u32 *count)                                 \
184 {                                                                              \
185         struct ia64_fpreg fr[6];                                               \
186         efi_status_t ret;                                                      \
187                                                                                \
188         ia64_save_scratch_fpregs(fr);                                          \
189         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)             \
190                                 __va(runtime->get_next_high_mono_count),       \
191                                 adjust_arg(count));                            \
192         ia64_load_scratch_fpregs(fr);                                          \
193         return ret;                                                            \
194 }
195 
196 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                  \
197 static void                                                                    \
198 prefix##_reset_system (int reset_type, efi_status_t status,                    \
199                        unsigned long data_size, efi_char16_t *data)            \
200 {                                                                              \
201         struct ia64_fpreg fr[6];                                               \
202         efi_char16_t *adata = NULL;                                            \
203                                                                                \
204         if (data)                                                              \
205                 adata = adjust_arg(data);                                      \
206                                                                                \
207         ia64_save_scratch_fpregs(fr);                                          \
208         efi_call_##prefix(                                                     \
209                 (efi_reset_system_t *) __va(runtime->reset_system),            \
210                 reset_type, status, data_size, adata);                         \
211         /* should not return, but just in case... */                           \
212         ia64_load_scratch_fpregs(fr);                                          \
213 }
214 
215 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
216 
217 STUB_GET_TIME(phys, phys_ptr)
218 STUB_SET_TIME(phys, phys_ptr)
219 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
220 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
221 STUB_GET_VARIABLE(phys, phys_ptr)
222 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
223 STUB_SET_VARIABLE(phys, phys_ptr)
224 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
225 STUB_RESET_SYSTEM(phys, phys_ptr)
226 
227 #define id(arg) arg
228 
229 STUB_GET_TIME(virt, id)
230 STUB_SET_TIME(virt, id)
231 STUB_GET_WAKEUP_TIME(virt, id)
232 STUB_SET_WAKEUP_TIME(virt, id)
233 STUB_GET_VARIABLE(virt, id)
234 STUB_GET_NEXT_VARIABLE(virt, id)
235 STUB_SET_VARIABLE(virt, id)
236 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
237 STUB_RESET_SYSTEM(virt, id)
238 
239 void
240 efi_gettimeofday (struct timespec64 *ts)
241 {
242         efi_time_t tm;
243 
244         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
245                 memset(ts, 0, sizeof(*ts));
246                 return;
247         }
248 
249         ts->tv_sec = mktime64(tm.year, tm.month, tm.day,
250                             tm.hour, tm.minute, tm.second);
251         ts->tv_nsec = tm.nanosecond;
252 }
253 
254 static int
255 is_memory_available (efi_memory_desc_t *md)
256 {
257         if (!(md->attribute & EFI_MEMORY_WB))
258                 return 0;
259 
260         switch (md->type) {
261               case EFI_LOADER_CODE:
262               case EFI_LOADER_DATA:
263               case EFI_BOOT_SERVICES_CODE:
264               case EFI_BOOT_SERVICES_DATA:
265               case EFI_CONVENTIONAL_MEMORY:
266                 return 1;
267         }
268         return 0;
269 }
270 
271 typedef struct kern_memdesc {
272         u64 attribute;
273         u64 start;
274         u64 num_pages;
275 } kern_memdesc_t;
276 
277 static kern_memdesc_t *kern_memmap;
278 
279 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
280 
281 static inline u64
282 kmd_end(kern_memdesc_t *kmd)
283 {
284         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
285 }
286 
287 static inline u64
288 efi_md_end(efi_memory_desc_t *md)
289 {
290         return (md->phys_addr + efi_md_size(md));
291 }
292 
293 static inline int
294 efi_wb(efi_memory_desc_t *md)
295 {
296         return (md->attribute & EFI_MEMORY_WB);
297 }
298 
299 static inline int
300 efi_uc(efi_memory_desc_t *md)
301 {
302         return (md->attribute & EFI_MEMORY_UC);
303 }
304 
305 static void
306 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
307 {
308         kern_memdesc_t *k;
309         u64 start, end, voff;
310 
311         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
312         for (k = kern_memmap; k->start != ~0UL; k++) {
313                 if (k->attribute != attr)
314                         continue;
315                 start = PAGE_ALIGN(k->start);
316                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
317                 if (start < end)
318                         if ((*callback)(start + voff, end + voff, arg) < 0)
319                                 return;
320         }
321 }
322 
323 /*
324  * Walk the EFI memory map and call CALLBACK once for each EFI memory
325  * descriptor that has memory that is available for OS use.
326  */
327 void
328 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
329 {
330         walk(callback, arg, EFI_MEMORY_WB);
331 }
332 
333 /*
334  * Walk the EFI memory map and call CALLBACK once for each EFI memory
335  * descriptor that has memory that is available for uncached allocator.
336  */
337 void
338 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
339 {
340         walk(callback, arg, EFI_MEMORY_UC);
341 }
342 
343 /*
344  * Look for the PAL_CODE region reported by EFI and map it using an
345  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
346  * Abstraction Layer chapter 11 in ADAG
347  */
348 void *
349 efi_get_pal_addr (void)
350 {
351         void *efi_map_start, *efi_map_end, *p;
352         efi_memory_desc_t *md;
353         u64 efi_desc_size;
354         int pal_code_count = 0;
355         u64 vaddr, mask;
356 
357         efi_map_start = __va(ia64_boot_param->efi_memmap);
358         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
359         efi_desc_size = ia64_boot_param->efi_memdesc_size;
360 
361         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
362                 md = p;
363                 if (md->type != EFI_PAL_CODE)
364                         continue;
365 
366                 if (++pal_code_count > 1) {
367                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
368                                "dropped @ %llx\n", md->phys_addr);
369                         continue;
370                 }
371                 /*
372                  * The only ITLB entry in region 7 that is used is the one
373                  * installed by __start().  That entry covers a 64MB range.
374                  */
375                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
376                 vaddr = PAGE_OFFSET + md->phys_addr;
377 
378                 /*
379                  * We must check that the PAL mapping won't overlap with the
380                  * kernel mapping.
381                  *
382                  * PAL code is guaranteed to be aligned on a power of 2 between
383                  * 4k and 256KB and that only one ITR is needed to map it. This
384                  * implies that the PAL code is always aligned on its size,
385                  * i.e., the closest matching page size supported by the TLB.
386                  * Therefore PAL code is guaranteed never to cross a 64MB unless
387                  * it is bigger than 64MB (very unlikely!).  So for now the
388                  * following test is enough to determine whether or not we need
389                  * a dedicated ITR for the PAL code.
390                  */
391                 if ((vaddr & mask) == (KERNEL_START & mask)) {
392                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
393                                __func__);
394                         continue;
395                 }
396 
397                 if (efi_md_size(md) > IA64_GRANULE_SIZE)
398                         panic("Whoa!  PAL code size bigger than a granule!");
399 
400 #if EFI_DEBUG
401                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
402 
403                 printk(KERN_INFO "CPU %d: mapping PAL code "
404                        "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
405                        smp_processor_id(), md->phys_addr,
406                        md->phys_addr + efi_md_size(md),
407                        vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
408 #endif
409                 return __va(md->phys_addr);
410         }
411         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
412                __func__);
413         return NULL;
414 }
415 
416 
417 static u8 __init palo_checksum(u8 *buffer, u32 length)
418 {
419         u8 sum = 0;
420         u8 *end = buffer + length;
421 
422         while (buffer < end)
423                 sum = (u8) (sum + *(buffer++));
424 
425         return sum;
426 }
427 
428 /*
429  * Parse and handle PALO table which is published at:
430  * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
431  */
432 static void __init handle_palo(unsigned long phys_addr)
433 {
434         struct palo_table *palo = __va(phys_addr);
435         u8  checksum;
436 
437         if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
438                 printk(KERN_INFO "PALO signature incorrect.\n");
439                 return;
440         }
441 
442         checksum = palo_checksum((u8 *)palo, palo->length);
443         if (checksum) {
444                 printk(KERN_INFO "PALO checksum incorrect.\n");
445                 return;
446         }
447 
448         setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
449 }
450 
451 void
452 efi_map_pal_code (void)
453 {
454         void *pal_vaddr = efi_get_pal_addr ();
455         u64 psr;
456 
457         if (!pal_vaddr)
458                 return;
459 
460         /*
461          * Cannot write to CRx with PSR.ic=1
462          */
463         psr = ia64_clear_ic();
464         ia64_itr(0x1, IA64_TR_PALCODE,
465                  GRANULEROUNDDOWN((unsigned long) pal_vaddr),
466                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
467                  IA64_GRANULE_SHIFT);
468         ia64_set_psr(psr);              /* restore psr */
469 }
470 
471 void __init
472 efi_init (void)
473 {
474         void *efi_map_start, *efi_map_end;
475         efi_char16_t *c16;
476         u64 efi_desc_size;
477         char *cp, vendor[100] = "unknown";
478         int i;
479 
480         set_bit(EFI_BOOT, &efi.flags);
481         set_bit(EFI_64BIT, &efi.flags);
482 
483         /*
484          * It's too early to be able to use the standard kernel command line
485          * support...
486          */
487         for (cp = boot_command_line; *cp; ) {
488                 if (memcmp(cp, "mem=", 4) == 0) {
489                         mem_limit = memparse(cp + 4, &cp);
490                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
491                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
492                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
493                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
494                 } else {
495                         while (*cp != ' ' && *cp)
496                                 ++cp;
497                         while (*cp == ' ')
498                                 ++cp;
499                 }
500         }
501         if (min_addr != 0UL)
502                 printk(KERN_INFO "Ignoring memory below %lluMB\n",
503                        min_addr >> 20);
504         if (max_addr != ~0UL)
505                 printk(KERN_INFO "Ignoring memory above %lluMB\n",
506                        max_addr >> 20);
507 
508         efi.systab = __va(ia64_boot_param->efi_systab);
509 
510         /*
511          * Verify the EFI Table
512          */
513         if (efi.systab == NULL)
514                 panic("Whoa! Can't find EFI system table.\n");
515         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
516                 panic("Whoa! EFI system table signature incorrect\n");
517         if ((efi.systab->hdr.revision >> 16) == 0)
518                 printk(KERN_WARNING "Warning: EFI system table version "
519                        "%d.%02d, expected 1.00 or greater\n",
520                        efi.systab->hdr.revision >> 16,
521                        efi.systab->hdr.revision & 0xffff);
522 
523         /* Show what we know for posterity */
524         c16 = __va(efi.systab->fw_vendor);
525         if (c16) {
526                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
527                         vendor[i] = *c16++;
528                 vendor[i] = '\0';
529         }
530 
531         printk(KERN_INFO "EFI v%u.%.02u by %s:",
532                efi.systab->hdr.revision >> 16,
533                efi.systab->hdr.revision & 0xffff, vendor);
534 
535         palo_phys      = EFI_INVALID_TABLE_ADDR;
536 
537         if (efi_config_init(arch_tables) != 0)
538                 return;
539 
540         if (palo_phys != EFI_INVALID_TABLE_ADDR)
541                 handle_palo(palo_phys);
542 
543         runtime = __va(efi.systab->runtime);
544         efi.get_time = phys_get_time;
545         efi.set_time = phys_set_time;
546         efi.get_wakeup_time = phys_get_wakeup_time;
547         efi.set_wakeup_time = phys_set_wakeup_time;
548         efi.get_variable = phys_get_variable;
549         efi.get_next_variable = phys_get_next_variable;
550         efi.set_variable = phys_set_variable;
551         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
552         efi.reset_system = phys_reset_system;
553 
554         efi_map_start = __va(ia64_boot_param->efi_memmap);
555         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
556         efi_desc_size = ia64_boot_param->efi_memdesc_size;
557 
558 #if EFI_DEBUG
559         /* print EFI memory map: */
560         {
561                 efi_memory_desc_t *md;
562                 void *p;
563 
564                 for (i = 0, p = efi_map_start; p < efi_map_end;
565                      ++i, p += efi_desc_size)
566                 {
567                         const char *unit;
568                         unsigned long size;
569                         char buf[64];
570 
571                         md = p;
572                         size = md->num_pages << EFI_PAGE_SHIFT;
573 
574                         if ((size >> 40) > 0) {
575                                 size >>= 40;
576                                 unit = "TB";
577                         } else if ((size >> 30) > 0) {
578                                 size >>= 30;
579                                 unit = "GB";
580                         } else if ((size >> 20) > 0) {
581                                 size >>= 20;
582                                 unit = "MB";
583                         } else {
584                                 size >>= 10;
585                                 unit = "KB";
586                         }
587 
588                         printk("mem%02d: %s "
589                                "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
590                                i, efi_md_typeattr_format(buf, sizeof(buf), md),
591                                md->phys_addr,
592                                md->phys_addr + efi_md_size(md), size, unit);
593                 }
594         }
595 #endif
596 
597         efi_map_pal_code();
598         efi_enter_virtual_mode();
599 }
600 
601 void
602 efi_enter_virtual_mode (void)
603 {
604         void *efi_map_start, *efi_map_end, *p;
605         efi_memory_desc_t *md;
606         efi_status_t status;
607         u64 efi_desc_size;
608 
609         efi_map_start = __va(ia64_boot_param->efi_memmap);
610         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
611         efi_desc_size = ia64_boot_param->efi_memdesc_size;
612 
613         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
614                 md = p;
615                 if (md->attribute & EFI_MEMORY_RUNTIME) {
616                         /*
617                          * Some descriptors have multiple bits set, so the
618                          * order of the tests is relevant.
619                          */
620                         if (md->attribute & EFI_MEMORY_WB) {
621                                 md->virt_addr = (u64) __va(md->phys_addr);
622                         } else if (md->attribute & EFI_MEMORY_UC) {
623                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
624                         } else if (md->attribute & EFI_MEMORY_WC) {
625 #if 0
626                                 md->virt_addr = ia64_remap(md->phys_addr,
627                                                            (_PAGE_A |
628                                                             _PAGE_P |
629                                                             _PAGE_D |
630                                                             _PAGE_MA_WC |
631                                                             _PAGE_PL_0 |
632                                                             _PAGE_AR_RW));
633 #else
634                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
635                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
636 #endif
637                         } else if (md->attribute & EFI_MEMORY_WT) {
638 #if 0
639                                 md->virt_addr = ia64_remap(md->phys_addr,
640                                                            (_PAGE_A |
641                                                             _PAGE_P |
642                                                             _PAGE_D |
643                                                             _PAGE_MA_WT |
644                                                             _PAGE_PL_0 |
645                                                             _PAGE_AR_RW));
646 #else
647                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
648                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
649 #endif
650                         }
651                 }
652         }
653 
654         status = efi_call_phys(__va(runtime->set_virtual_address_map),
655                                ia64_boot_param->efi_memmap_size,
656                                efi_desc_size,
657                                ia64_boot_param->efi_memdesc_version,
658                                ia64_boot_param->efi_memmap);
659         if (status != EFI_SUCCESS) {
660                 printk(KERN_WARNING "warning: unable to switch EFI into "
661                        "virtual mode (status=%lu)\n", status);
662                 return;
663         }
664 
665         set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
666 
667         /*
668          * Now that EFI is in virtual mode, we call the EFI functions more
669          * efficiently:
670          */
671         efi.get_time = virt_get_time;
672         efi.set_time = virt_set_time;
673         efi.get_wakeup_time = virt_get_wakeup_time;
674         efi.set_wakeup_time = virt_set_wakeup_time;
675         efi.get_variable = virt_get_variable;
676         efi.get_next_variable = virt_get_next_variable;
677         efi.set_variable = virt_set_variable;
678         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
679         efi.reset_system = virt_reset_system;
680 }
681 
682 /*
683  * Walk the EFI memory map looking for the I/O port range.  There can only be
684  * one entry of this type, other I/O port ranges should be described via ACPI.
685  */
686 u64
687 efi_get_iobase (void)
688 {
689         void *efi_map_start, *efi_map_end, *p;
690         efi_memory_desc_t *md;
691         u64 efi_desc_size;
692 
693         efi_map_start = __va(ia64_boot_param->efi_memmap);
694         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
695         efi_desc_size = ia64_boot_param->efi_memdesc_size;
696 
697         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
698                 md = p;
699                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
700                         if (md->attribute & EFI_MEMORY_UC)
701                                 return md->phys_addr;
702                 }
703         }
704         return 0;
705 }
706 
707 static struct kern_memdesc *
708 kern_memory_descriptor (unsigned long phys_addr)
709 {
710         struct kern_memdesc *md;
711 
712         for (md = kern_memmap; md->start != ~0UL; md++) {
713                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
714                          return md;
715         }
716         return NULL;
717 }
718 
719 static efi_memory_desc_t *
720 efi_memory_descriptor (unsigned long phys_addr)
721 {
722         void *efi_map_start, *efi_map_end, *p;
723         efi_memory_desc_t *md;
724         u64 efi_desc_size;
725 
726         efi_map_start = __va(ia64_boot_param->efi_memmap);
727         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
728         efi_desc_size = ia64_boot_param->efi_memdesc_size;
729 
730         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
731                 md = p;
732 
733                 if (phys_addr - md->phys_addr < efi_md_size(md))
734                          return md;
735         }
736         return NULL;
737 }
738 
739 static int
740 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
741 {
742         void *efi_map_start, *efi_map_end, *p;
743         efi_memory_desc_t *md;
744         u64 efi_desc_size;
745         unsigned long end;
746 
747         efi_map_start = __va(ia64_boot_param->efi_memmap);
748         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
749         efi_desc_size = ia64_boot_param->efi_memdesc_size;
750 
751         end = phys_addr + size;
752 
753         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
754                 md = p;
755                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
756                         return 1;
757         }
758         return 0;
759 }
760 
761 int
762 efi_mem_type (unsigned long phys_addr)
763 {
764         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
765 
766         if (md)
767                 return md->type;
768         return -EINVAL;
769 }
770 
771 u64
772 efi_mem_attributes (unsigned long phys_addr)
773 {
774         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
775 
776         if (md)
777                 return md->attribute;
778         return 0;
779 }
780 EXPORT_SYMBOL(efi_mem_attributes);
781 
782 u64
783 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
784 {
785         unsigned long end = phys_addr + size;
786         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
787         u64 attr;
788 
789         if (!md)
790                 return 0;
791 
792         /*
793          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
794          * the kernel that firmware needs this region mapped.
795          */
796         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
797         do {
798                 unsigned long md_end = efi_md_end(md);
799 
800                 if (end <= md_end)
801                         return attr;
802 
803                 md = efi_memory_descriptor(md_end);
804                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
805                         return 0;
806         } while (md);
807         return 0;       /* never reached */
808 }
809 
810 u64
811 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
812 {
813         unsigned long end = phys_addr + size;
814         struct kern_memdesc *md;
815         u64 attr;
816 
817         /*
818          * This is a hack for ioremap calls before we set up kern_memmap.
819          * Maybe we should do efi_memmap_init() earlier instead.
820          */
821         if (!kern_memmap) {
822                 attr = efi_mem_attribute(phys_addr, size);
823                 if (attr & EFI_MEMORY_WB)
824                         return EFI_MEMORY_WB;
825                 return 0;
826         }
827 
828         md = kern_memory_descriptor(phys_addr);
829         if (!md)
830                 return 0;
831 
832         attr = md->attribute;
833         do {
834                 unsigned long md_end = kmd_end(md);
835 
836                 if (end <= md_end)
837                         return attr;
838 
839                 md = kern_memory_descriptor(md_end);
840                 if (!md || md->attribute != attr)
841                         return 0;
842         } while (md);
843         return 0;       /* never reached */
844 }
845 
846 int
847 valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
848 {
849         u64 attr;
850 
851         /*
852          * /dev/mem reads and writes use copy_to_user(), which implicitly
853          * uses a granule-sized kernel identity mapping.  It's really
854          * only safe to do this for regions in kern_memmap.  For more
855          * details, see Documentation/ia64/aliasing.txt.
856          */
857         attr = kern_mem_attribute(phys_addr, size);
858         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
859                 return 1;
860         return 0;
861 }
862 
863 int
864 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
865 {
866         unsigned long phys_addr = pfn << PAGE_SHIFT;
867         u64 attr;
868 
869         attr = efi_mem_attribute(phys_addr, size);
870 
871         /*
872          * /dev/mem mmap uses normal user pages, so we don't need the entire
873          * granule, but the entire region we're mapping must support the same
874          * attribute.
875          */
876         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
877                 return 1;
878 
879         /*
880          * Intel firmware doesn't tell us about all the MMIO regions, so
881          * in general we have to allow mmap requests.  But if EFI *does*
882          * tell us about anything inside this region, we should deny it.
883          * The user can always map a smaller region to avoid the overlap.
884          */
885         if (efi_memmap_intersects(phys_addr, size))
886                 return 0;
887 
888         return 1;
889 }
890 
891 pgprot_t
892 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
893                      pgprot_t vma_prot)
894 {
895         unsigned long phys_addr = pfn << PAGE_SHIFT;
896         u64 attr;
897 
898         /*
899          * For /dev/mem mmap, we use user mappings, but if the region is
900          * in kern_memmap (and hence may be covered by a kernel mapping),
901          * we must use the same attribute as the kernel mapping.
902          */
903         attr = kern_mem_attribute(phys_addr, size);
904         if (attr & EFI_MEMORY_WB)
905                 return pgprot_cacheable(vma_prot);
906         else if (attr & EFI_MEMORY_UC)
907                 return pgprot_noncached(vma_prot);
908 
909         /*
910          * Some chipsets don't support UC access to memory.  If
911          * WB is supported, we prefer that.
912          */
913         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
914                 return pgprot_cacheable(vma_prot);
915 
916         return pgprot_noncached(vma_prot);
917 }
918 
919 int __init
920 efi_uart_console_only(void)
921 {
922         efi_status_t status;
923         char *s, name[] = "ConOut";
924         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
925         efi_char16_t *utf16, name_utf16[32];
926         unsigned char data[1024];
927         unsigned long size = sizeof(data);
928         struct efi_generic_dev_path *hdr, *end_addr;
929         int uart = 0;
930 
931         /* Convert to UTF-16 */
932         utf16 = name_utf16;
933         s = name;
934         while (*s)
935                 *utf16++ = *s++ & 0x7f;
936         *utf16 = 0;
937 
938         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
939         if (status != EFI_SUCCESS) {
940                 printk(KERN_ERR "No EFI %s variable?\n", name);
941                 return 0;
942         }
943 
944         hdr = (struct efi_generic_dev_path *) data;
945         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
946         while (hdr < end_addr) {
947                 if (hdr->type == EFI_DEV_MSG &&
948                     hdr->sub_type == EFI_DEV_MSG_UART)
949                         uart = 1;
950                 else if (hdr->type == EFI_DEV_END_PATH ||
951                           hdr->type == EFI_DEV_END_PATH2) {
952                         if (!uart)
953                                 return 0;
954                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
955                                 return 1;
956                         uart = 0;
957                 }
958                 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
959         }
960         printk(KERN_ERR "Malformed %s value\n", name);
961         return 0;
962 }
963 
964 /*
965  * Look for the first granule aligned memory descriptor memory
966  * that is big enough to hold EFI memory map. Make sure this
967  * descriptor is at least granule sized so it does not get trimmed
968  */
969 struct kern_memdesc *
970 find_memmap_space (void)
971 {
972         u64     contig_low=0, contig_high=0;
973         u64     as = 0, ae;
974         void *efi_map_start, *efi_map_end, *p, *q;
975         efi_memory_desc_t *md, *pmd = NULL, *check_md;
976         u64     space_needed, efi_desc_size;
977         unsigned long total_mem = 0;
978 
979         efi_map_start = __va(ia64_boot_param->efi_memmap);
980         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
981         efi_desc_size = ia64_boot_param->efi_memdesc_size;
982 
983         /*
984          * Worst case: we need 3 kernel descriptors for each efi descriptor
985          * (if every entry has a WB part in the middle, and UC head and tail),
986          * plus one for the end marker.
987          */
988         space_needed = sizeof(kern_memdesc_t) *
989                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
990 
991         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
992                 md = p;
993                 if (!efi_wb(md)) {
994                         continue;
995                 }
996                 if (pmd == NULL || !efi_wb(pmd) ||
997                     efi_md_end(pmd) != md->phys_addr) {
998                         contig_low = GRANULEROUNDUP(md->phys_addr);
999                         contig_high = efi_md_end(md);
1000                         for (q = p + efi_desc_size; q < efi_map_end;
1001                              q += efi_desc_size) {
1002                                 check_md = q;
1003                                 if (!efi_wb(check_md))
1004                                         break;
1005                                 if (contig_high != check_md->phys_addr)
1006                                         break;
1007                                 contig_high = efi_md_end(check_md);
1008                         }
1009                         contig_high = GRANULEROUNDDOWN(contig_high);
1010                 }
1011                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1012                         continue;
1013 
1014                 /* Round ends inward to granule boundaries */
1015                 as = max(contig_low, md->phys_addr);
1016                 ae = min(contig_high, efi_md_end(md));
1017 
1018                 /* keep within max_addr= and min_addr= command line arg */
1019                 as = max(as, min_addr);
1020                 ae = min(ae, max_addr);
1021                 if (ae <= as)
1022                         continue;
1023 
1024                 /* avoid going over mem= command line arg */
1025                 if (total_mem + (ae - as) > mem_limit)
1026                         ae -= total_mem + (ae - as) - mem_limit;
1027 
1028                 if (ae <= as)
1029                         continue;
1030 
1031                 if (ae - as > space_needed)
1032                         break;
1033         }
1034         if (p >= efi_map_end)
1035                 panic("Can't allocate space for kernel memory descriptors");
1036 
1037         return __va(as);
1038 }
1039 
1040 /*
1041  * Walk the EFI memory map and gather all memory available for kernel
1042  * to use.  We can allocate partial granules only if the unavailable
1043  * parts exist, and are WB.
1044  */
1045 unsigned long
1046 efi_memmap_init(u64 *s, u64 *e)
1047 {
1048         struct kern_memdesc *k, *prev = NULL;
1049         u64     contig_low=0, contig_high=0;
1050         u64     as, ae, lim;
1051         void *efi_map_start, *efi_map_end, *p, *q;
1052         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1053         u64     efi_desc_size;
1054         unsigned long total_mem = 0;
1055 
1056         k = kern_memmap = find_memmap_space();
1057 
1058         efi_map_start = __va(ia64_boot_param->efi_memmap);
1059         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1060         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1061 
1062         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1063                 md = p;
1064                 if (!efi_wb(md)) {
1065                         if (efi_uc(md) &&
1066                             (md->type == EFI_CONVENTIONAL_MEMORY ||
1067                              md->type == EFI_BOOT_SERVICES_DATA)) {
1068                                 k->attribute = EFI_MEMORY_UC;
1069                                 k->start = md->phys_addr;
1070                                 k->num_pages = md->num_pages;
1071                                 k++;
1072                         }
1073                         continue;
1074                 }
1075                 if (pmd == NULL || !efi_wb(pmd) ||
1076                     efi_md_end(pmd) != md->phys_addr) {
1077                         contig_low = GRANULEROUNDUP(md->phys_addr);
1078                         contig_high = efi_md_end(md);
1079                         for (q = p + efi_desc_size; q < efi_map_end;
1080                              q += efi_desc_size) {
1081                                 check_md = q;
1082                                 if (!efi_wb(check_md))
1083                                         break;
1084                                 if (contig_high != check_md->phys_addr)
1085                                         break;
1086                                 contig_high = efi_md_end(check_md);
1087                         }
1088                         contig_high = GRANULEROUNDDOWN(contig_high);
1089                 }
1090                 if (!is_memory_available(md))
1091                         continue;
1092 
1093                 /*
1094                  * Round ends inward to granule boundaries
1095                  * Give trimmings to uncached allocator
1096                  */
1097                 if (md->phys_addr < contig_low) {
1098                         lim = min(efi_md_end(md), contig_low);
1099                         if (efi_uc(md)) {
1100                                 if (k > kern_memmap &&
1101                                     (k-1)->attribute == EFI_MEMORY_UC &&
1102                                     kmd_end(k-1) == md->phys_addr) {
1103                                         (k-1)->num_pages +=
1104                                                 (lim - md->phys_addr)
1105                                                 >> EFI_PAGE_SHIFT;
1106                                 } else {
1107                                         k->attribute = EFI_MEMORY_UC;
1108                                         k->start = md->phys_addr;
1109                                         k->num_pages = (lim - md->phys_addr)
1110                                                 >> EFI_PAGE_SHIFT;
1111                                         k++;
1112                                 }
1113                         }
1114                         as = contig_low;
1115                 } else
1116                         as = md->phys_addr;
1117 
1118                 if (efi_md_end(md) > contig_high) {
1119                         lim = max(md->phys_addr, contig_high);
1120                         if (efi_uc(md)) {
1121                                 if (lim == md->phys_addr && k > kern_memmap &&
1122                                     (k-1)->attribute == EFI_MEMORY_UC &&
1123                                     kmd_end(k-1) == md->phys_addr) {
1124                                         (k-1)->num_pages += md->num_pages;
1125                                 } else {
1126                                         k->attribute = EFI_MEMORY_UC;
1127                                         k->start = lim;
1128                                         k->num_pages = (efi_md_end(md) - lim)
1129                                                 >> EFI_PAGE_SHIFT;
1130                                         k++;
1131                                 }
1132                         }
1133                         ae = contig_high;
1134                 } else
1135                         ae = efi_md_end(md);
1136 
1137                 /* keep within max_addr= and min_addr= command line arg */
1138                 as = max(as, min_addr);
1139                 ae = min(ae, max_addr);
1140                 if (ae <= as)
1141                         continue;
1142 
1143                 /* avoid going over mem= command line arg */
1144                 if (total_mem + (ae - as) > mem_limit)
1145                         ae -= total_mem + (ae - as) - mem_limit;
1146 
1147                 if (ae <= as)
1148                         continue;
1149                 if (prev && kmd_end(prev) == md->phys_addr) {
1150                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1151                         total_mem += ae - as;
1152                         continue;
1153                 }
1154                 k->attribute = EFI_MEMORY_WB;
1155                 k->start = as;
1156                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1157                 total_mem += ae - as;
1158                 prev = k++;
1159         }
1160         k->start = ~0L; /* end-marker */
1161 
1162         /* reserve the memory we are using for kern_memmap */
1163         *s = (u64)kern_memmap;
1164         *e = (u64)++k;
1165 
1166         return total_mem;
1167 }
1168 
1169 void
1170 efi_initialize_iomem_resources(struct resource *code_resource,
1171                                struct resource *data_resource,
1172                                struct resource *bss_resource)
1173 {
1174         struct resource *res;
1175         void *efi_map_start, *efi_map_end, *p;
1176         efi_memory_desc_t *md;
1177         u64 efi_desc_size;
1178         char *name;
1179         unsigned long flags, desc;
1180 
1181         efi_map_start = __va(ia64_boot_param->efi_memmap);
1182         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1183         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1184 
1185         res = NULL;
1186 
1187         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1188                 md = p;
1189 
1190                 if (md->num_pages == 0) /* should not happen */
1191                         continue;
1192 
1193                 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1194                 desc = IORES_DESC_NONE;
1195 
1196                 switch (md->type) {
1197 
1198                         case EFI_MEMORY_MAPPED_IO:
1199                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1200                                 continue;
1201 
1202                         case EFI_LOADER_CODE:
1203                         case EFI_LOADER_DATA:
1204                         case EFI_BOOT_SERVICES_DATA:
1205                         case EFI_BOOT_SERVICES_CODE:
1206                         case EFI_CONVENTIONAL_MEMORY:
1207                                 if (md->attribute & EFI_MEMORY_WP) {
1208                                         name = "System ROM";
1209                                         flags |= IORESOURCE_READONLY;
1210                                 } else if (md->attribute == EFI_MEMORY_UC) {
1211                                         name = "Uncached RAM";
1212                                 } else {
1213                                         name = "System RAM";
1214                                         flags |= IORESOURCE_SYSRAM;
1215                                 }
1216                                 break;
1217 
1218                         case EFI_ACPI_MEMORY_NVS:
1219                                 name = "ACPI Non-volatile Storage";
1220                                 desc = IORES_DESC_ACPI_NV_STORAGE;
1221                                 break;
1222 
1223                         case EFI_UNUSABLE_MEMORY:
1224                                 name = "reserved";
1225                                 flags |= IORESOURCE_DISABLED;
1226                                 break;
1227 
1228                         case EFI_PERSISTENT_MEMORY:
1229                                 name = "Persistent Memory";
1230                                 desc = IORES_DESC_PERSISTENT_MEMORY;
1231                                 break;
1232 
1233                         case EFI_RESERVED_TYPE:
1234                         case EFI_RUNTIME_SERVICES_CODE:
1235                         case EFI_RUNTIME_SERVICES_DATA:
1236                         case EFI_ACPI_RECLAIM_MEMORY:
1237                         default:
1238                                 name = "reserved";
1239                                 break;
1240                 }
1241 
1242                 if ((res = kzalloc(sizeof(struct resource),
1243                                    GFP_KERNEL)) == NULL) {
1244                         printk(KERN_ERR
1245                                "failed to allocate resource for iomem\n");
1246                         return;
1247                 }
1248 
1249                 res->name = name;
1250                 res->start = md->phys_addr;
1251                 res->end = md->phys_addr + efi_md_size(md) - 1;
1252                 res->flags = flags;
1253                 res->desc = desc;
1254 
1255                 if (insert_resource(&iomem_resource, res) < 0)
1256                         kfree(res);
1257                 else {
1258                         /*
1259                          * We don't know which region contains
1260                          * kernel data so we try it repeatedly and
1261                          * let the resource manager test it.
1262                          */
1263                         insert_resource(res, code_resource);
1264                         insert_resource(res, data_resource);
1265                         insert_resource(res, bss_resource);
1266 #ifdef CONFIG_KEXEC
1267                         insert_resource(res, &efi_memmap_res);
1268                         insert_resource(res, &boot_param_res);
1269                         if (crashk_res.end > crashk_res.start)
1270                                 insert_resource(res, &crashk_res);
1271 #endif
1272                 }
1273         }
1274 }
1275 
1276 #ifdef CONFIG_KEXEC
1277 /* find a block of memory aligned to 64M exclude reserved regions
1278    rsvd_regions are sorted
1279  */
1280 unsigned long __init
1281 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1282 {
1283         int i;
1284         u64 start, end;
1285         u64 alignment = 1UL << _PAGE_SIZE_64M;
1286         void *efi_map_start, *efi_map_end, *p;
1287         efi_memory_desc_t *md;
1288         u64 efi_desc_size;
1289 
1290         efi_map_start = __va(ia64_boot_param->efi_memmap);
1291         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1292         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1293 
1294         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1295                 md = p;
1296                 if (!efi_wb(md))
1297                         continue;
1298                 start = ALIGN(md->phys_addr, alignment);
1299                 end = efi_md_end(md);
1300                 for (i = 0; i < n; i++) {
1301                         if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1302                                 if (__pa(r[i].start) > start + size)
1303                                         return start;
1304                                 start = ALIGN(__pa(r[i].end), alignment);
1305                                 if (i < n-1 &&
1306                                     __pa(r[i+1].start) < start + size)
1307                                         continue;
1308                                 else
1309                                         break;
1310                         }
1311                 }
1312                 if (end > start + size)
1313                         return start;
1314         }
1315 
1316         printk(KERN_WARNING
1317                "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1318         return ~0UL;
1319 }
1320 #endif
1321 
1322 #ifdef CONFIG_CRASH_DUMP
1323 /* locate the size find a the descriptor at a certain address */
1324 unsigned long __init
1325 vmcore_find_descriptor_size (unsigned long address)
1326 {
1327         void *efi_map_start, *efi_map_end, *p;
1328         efi_memory_desc_t *md;
1329         u64 efi_desc_size;
1330         unsigned long ret = 0;
1331 
1332         efi_map_start = __va(ia64_boot_param->efi_memmap);
1333         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1334         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1335 
1336         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1337                 md = p;
1338                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1339                     && md->phys_addr == address) {
1340                         ret = efi_md_size(md);
1341                         break;
1342                 }
1343         }
1344 
1345         if (ret == 0)
1346                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1347 
1348         return ret;
1349 }
1350 #endif
1351 

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