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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
48static __initdata unsigned long palo_phys;
49
50unsigned long sal_systab_phys = EFI_INVALID_TABLE_ADDR;
51
52static __initdata efi_config_table_type_t arch_tables[] = {
53 {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, "PALO", &palo_phys},
54 {SAL_SYSTEM_TABLE_GUID, "SALsystab", &sal_systab_phys},
55 {NULL_GUID, NULL, 0},
56};
57
58extern efi_status_t efi_call_phys (void *, ...);
59
60static efi_runtime_services_t *runtime;
61static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
62
63#define efi_call_virt(f, args...) (*(f))(args)
64
65#define STUB_GET_TIME(prefix, adjust_arg) \
66static efi_status_t \
67prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \
68{ \
69 struct ia64_fpreg fr[6]; \
70 efi_time_cap_t *atc = NULL; \
71 efi_status_t ret; \
72 \
73 if (tc) \
74 atc = adjust_arg(tc); \
75 ia64_save_scratch_fpregs(fr); \
76 ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), \
77 adjust_arg(tm), atc); \
78 ia64_load_scratch_fpregs(fr); \
79 return ret; \
80}
81
82#define STUB_SET_TIME(prefix, adjust_arg) \
83static efi_status_t \
84prefix##_set_time (efi_time_t *tm) \
85{ \
86 struct ia64_fpreg fr[6]; \
87 efi_status_t ret; \
88 \
89 ia64_save_scratch_fpregs(fr); \
90 ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), \
91 adjust_arg(tm)); \
92 ia64_load_scratch_fpregs(fr); \
93 return ret; \
94}
95
96#define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \
97static efi_status_t \
98prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, \
99 efi_time_t *tm) \
100{ \
101 struct ia64_fpreg fr[6]; \
102 efi_status_t ret; \
103 \
104 ia64_save_scratch_fpregs(fr); \
105 ret = efi_call_##prefix( \
106 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time), \
107 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm)); \
108 ia64_load_scratch_fpregs(fr); \
109 return ret; \
110}
111
112#define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \
113static efi_status_t \
114prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \
115{ \
116 struct ia64_fpreg fr[6]; \
117 efi_time_t *atm = NULL; \
118 efi_status_t ret; \
119 \
120 if (tm) \
121 atm = adjust_arg(tm); \
122 ia64_save_scratch_fpregs(fr); \
123 ret = efi_call_##prefix( \
124 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time), \
125 enabled, atm); \
126 ia64_load_scratch_fpregs(fr); \
127 return ret; \
128}
129
130#define STUB_GET_VARIABLE(prefix, adjust_arg) \
131static efi_status_t \
132prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \
133 unsigned long *data_size, void *data) \
134{ \
135 struct ia64_fpreg fr[6]; \
136 u32 *aattr = NULL; \
137 efi_status_t ret; \
138 \
139 if (attr) \
140 aattr = adjust_arg(attr); \
141 ia64_save_scratch_fpregs(fr); \
142 ret = efi_call_##prefix( \
143 (efi_get_variable_t *) __va(runtime->get_variable), \
144 adjust_arg(name), adjust_arg(vendor), aattr, \
145 adjust_arg(data_size), adjust_arg(data)); \
146 ia64_load_scratch_fpregs(fr); \
147 return ret; \
148}
149
150#define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \
151static efi_status_t \
152prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, \
153 efi_guid_t *vendor) \
154{ \
155 struct ia64_fpreg fr[6]; \
156 efi_status_t ret; \
157 \
158 ia64_save_scratch_fpregs(fr); \
159 ret = efi_call_##prefix( \
160 (efi_get_next_variable_t *) __va(runtime->get_next_variable), \
161 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor)); \
162 ia64_load_scratch_fpregs(fr); \
163 return ret; \
164}
165
166#define STUB_SET_VARIABLE(prefix, adjust_arg) \
167static efi_status_t \
168prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, \
169 u32 attr, unsigned long data_size, \
170 void *data) \
171{ \
172 struct ia64_fpreg fr[6]; \
173 efi_status_t ret; \
174 \
175 ia64_save_scratch_fpregs(fr); \
176 ret = efi_call_##prefix( \
177 (efi_set_variable_t *) __va(runtime->set_variable), \
178 adjust_arg(name), adjust_arg(vendor), attr, data_size, \
179 adjust_arg(data)); \
180 ia64_load_scratch_fpregs(fr); \
181 return ret; \
182}
183
184#define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \
185static efi_status_t \
186prefix##_get_next_high_mono_count (u32 *count) \
187{ \
188 struct ia64_fpreg fr[6]; \
189 efi_status_t ret; \
190 \
191 ia64_save_scratch_fpregs(fr); \
192 ret = efi_call_##prefix((efi_get_next_high_mono_count_t *) \
193 __va(runtime->get_next_high_mono_count), \
194 adjust_arg(count)); \
195 ia64_load_scratch_fpregs(fr); \
196 return ret; \
197}
198
199#define STUB_RESET_SYSTEM(prefix, adjust_arg) \
200static void \
201prefix##_reset_system (int reset_type, efi_status_t status, \
202 unsigned long data_size, efi_char16_t *data) \
203{ \
204 struct ia64_fpreg fr[6]; \
205 efi_char16_t *adata = NULL; \
206 \
207 if (data) \
208 adata = adjust_arg(data); \
209 \
210 ia64_save_scratch_fpregs(fr); \
211 efi_call_##prefix( \
212 (efi_reset_system_t *) __va(runtime->reset_system), \
213 reset_type, status, data_size, adata); \
214 /* should not return, but just in case... */ \
215 ia64_load_scratch_fpregs(fr); \
216}
217
218#define phys_ptr(arg) ((__typeof__(arg)) ia64_tpa(arg))
219
220STUB_GET_TIME(phys, phys_ptr)
221STUB_SET_TIME(phys, phys_ptr)
222STUB_GET_WAKEUP_TIME(phys, phys_ptr)
223STUB_SET_WAKEUP_TIME(phys, phys_ptr)
224STUB_GET_VARIABLE(phys, phys_ptr)
225STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
226STUB_SET_VARIABLE(phys, phys_ptr)
227STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
228STUB_RESET_SYSTEM(phys, phys_ptr)
229
230#define id(arg) arg
231
232STUB_GET_TIME(virt, id)
233STUB_SET_TIME(virt, id)
234STUB_GET_WAKEUP_TIME(virt, id)
235STUB_SET_WAKEUP_TIME(virt, id)
236STUB_GET_VARIABLE(virt, id)
237STUB_GET_NEXT_VARIABLE(virt, id)
238STUB_SET_VARIABLE(virt, id)
239STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
240STUB_RESET_SYSTEM(virt, id)
241
242void
243efi_gettimeofday (struct timespec64 *ts)
244{
245 efi_time_t tm;
246
247 if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
248 memset(ts, 0, sizeof(*ts));
249 return;
250 }
251
252 ts->tv_sec = mktime64(tm.year, tm.month, tm.day,
253 tm.hour, tm.minute, tm.second);
254 ts->tv_nsec = tm.nanosecond;
255}
256
257static int
258is_memory_available (efi_memory_desc_t *md)
259{
260 if (!(md->attribute & EFI_MEMORY_WB))
261 return 0;
262
263 switch (md->type) {
264 case EFI_LOADER_CODE:
265 case EFI_LOADER_DATA:
266 case EFI_BOOT_SERVICES_CODE:
267 case EFI_BOOT_SERVICES_DATA:
268 case EFI_CONVENTIONAL_MEMORY:
269 return 1;
270 }
271 return 0;
272}
273
274typedef struct kern_memdesc {
275 u64 attribute;
276 u64 start;
277 u64 num_pages;
278} kern_memdesc_t;
279
280static kern_memdesc_t *kern_memmap;
281
282#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
283
284static inline u64
285kmd_end(kern_memdesc_t *kmd)
286{
287 return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
288}
289
290static inline u64
291efi_md_end(efi_memory_desc_t *md)
292{
293 return (md->phys_addr + efi_md_size(md));
294}
295
296static inline int
297efi_wb(efi_memory_desc_t *md)
298{
299 return (md->attribute & EFI_MEMORY_WB);
300}
301
302static inline int
303efi_uc(efi_memory_desc_t *md)
304{
305 return (md->attribute & EFI_MEMORY_UC);
306}
307
308static void
309walk (efi_freemem_callback_t callback, void *arg, u64 attr)
310{
311 kern_memdesc_t *k;
312 u64 start, end, voff;
313
314 voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
315 for (k = kern_memmap; k->start != ~0UL; k++) {
316 if (k->attribute != attr)
317 continue;
318 start = PAGE_ALIGN(k->start);
319 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
320 if (start < end)
321 if ((*callback)(start + voff, end + voff, arg) < 0)
322 return;
323 }
324}
325
326/*
327 * Walk the EFI memory map and call CALLBACK once for each EFI memory
328 * descriptor that has memory that is available for OS use.
329 */
330void
331efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
332{
333 walk(callback, arg, EFI_MEMORY_WB);
334}
335
336/*
337 * Walk the EFI memory map and call CALLBACK once for each EFI memory
338 * descriptor that has memory that is available for uncached allocator.
339 */
340void
341efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
342{
343 walk(callback, arg, EFI_MEMORY_UC);
344}
345
346/*
347 * Look for the PAL_CODE region reported by EFI and map it using an
348 * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor
349 * Abstraction Layer chapter 11 in ADAG
350 */
351void *
352efi_get_pal_addr (void)
353{
354 void *efi_map_start, *efi_map_end, *p;
355 efi_memory_desc_t *md;
356 u64 efi_desc_size;
357 int pal_code_count = 0;
358 u64 vaddr, mask;
359
360 efi_map_start = __va(ia64_boot_param->efi_memmap);
361 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
362 efi_desc_size = ia64_boot_param->efi_memdesc_size;
363
364 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
365 md = p;
366 if (md->type != EFI_PAL_CODE)
367 continue;
368
369 if (++pal_code_count > 1) {
370 printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
371 "dropped @ %llx\n", md->phys_addr);
372 continue;
373 }
374 /*
375 * The only ITLB entry in region 7 that is used is the one
376 * installed by __start(). That entry covers a 64MB range.
377 */
378 mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
379 vaddr = PAGE_OFFSET + md->phys_addr;
380
381 /*
382 * We must check that the PAL mapping won't overlap with the
383 * kernel mapping.
384 *
385 * PAL code is guaranteed to be aligned on a power of 2 between
386 * 4k and 256KB and that only one ITR is needed to map it. This
387 * implies that the PAL code is always aligned on its size,
388 * i.e., the closest matching page size supported by the TLB.
389 * Therefore PAL code is guaranteed never to cross a 64MB unless
390 * it is bigger than 64MB (very unlikely!). So for now the
391 * following test is enough to determine whether or not we need
392 * a dedicated ITR for the PAL code.
393 */
394 if ((vaddr & mask) == (KERNEL_START & mask)) {
395 printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
396 __func__);
397 continue;
398 }
399
400 if (efi_md_size(md) > IA64_GRANULE_SIZE)
401 panic("Whoa! PAL code size bigger than a granule!");
402
403#if EFI_DEBUG
404 mask = ~((1 << IA64_GRANULE_SHIFT) - 1);
405
406 printk(KERN_INFO "CPU %d: mapping PAL code "
407 "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
408 smp_processor_id(), md->phys_addr,
409 md->phys_addr + efi_md_size(md),
410 vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
411#endif
412 return __va(md->phys_addr);
413 }
414 printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
415 __func__);
416 return NULL;
417}
418
419
420static u8 __init palo_checksum(u8 *buffer, u32 length)
421{
422 u8 sum = 0;
423 u8 *end = buffer + length;
424
425 while (buffer < end)
426 sum = (u8) (sum + *(buffer++));
427
428 return sum;
429}
430
431/*
432 * Parse and handle PALO table which is published at:
433 * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
434 */
435static void __init handle_palo(unsigned long phys_addr)
436{
437 struct palo_table *palo = __va(phys_addr);
438 u8 checksum;
439
440 if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
441 printk(KERN_INFO "PALO signature incorrect.\n");
442 return;
443 }
444
445 checksum = palo_checksum((u8 *)palo, palo->length);
446 if (checksum) {
447 printk(KERN_INFO "PALO checksum incorrect.\n");
448 return;
449 }
450
451 setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
452}
453
454void
455efi_map_pal_code (void)
456{
457 void *pal_vaddr = efi_get_pal_addr ();
458 u64 psr;
459
460 if (!pal_vaddr)
461 return;
462
463 /*
464 * Cannot write to CRx with PSR.ic=1
465 */
466 psr = ia64_clear_ic();
467 ia64_itr(0x1, IA64_TR_PALCODE,
468 GRANULEROUNDDOWN((unsigned long) pal_vaddr),
469 pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
470 IA64_GRANULE_SHIFT);
471 ia64_set_psr(psr); /* restore psr */
472}
473
474void __init
475efi_init (void)
476{
477 void *efi_map_start, *efi_map_end;
478 efi_char16_t *c16;
479 u64 efi_desc_size;
480 char *cp, vendor[100] = "unknown";
481 int i;
482
483 set_bit(EFI_BOOT, &efi.flags);
484 set_bit(EFI_64BIT, &efi.flags);
485
486 /*
487 * It's too early to be able to use the standard kernel command line
488 * support...
489 */
490 for (cp = boot_command_line; *cp; ) {
491 if (memcmp(cp, "mem=", 4) == 0) {
492 mem_limit = memparse(cp + 4, &cp);
493 } else if (memcmp(cp, "max_addr=", 9) == 0) {
494 max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
495 } else if (memcmp(cp, "min_addr=", 9) == 0) {
496 min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
497 } else {
498 while (*cp != ' ' && *cp)
499 ++cp;
500 while (*cp == ' ')
501 ++cp;
502 }
503 }
504 if (min_addr != 0UL)
505 printk(KERN_INFO "Ignoring memory below %lluMB\n",
506 min_addr >> 20);
507 if (max_addr != ~0UL)
508 printk(KERN_INFO "Ignoring memory above %lluMB\n",
509 max_addr >> 20);
510
511 efi.systab = __va(ia64_boot_param->efi_systab);
512
513 /*
514 * Verify the EFI Table
515 */
516 if (efi.systab == NULL)
517 panic("Whoa! Can't find EFI system table.\n");
518 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
519 panic("Whoa! EFI system table signature incorrect\n");
520 if ((efi.systab->hdr.revision >> 16) == 0)
521 printk(KERN_WARNING "Warning: EFI system table version "
522 "%d.%02d, expected 1.00 or greater\n",
523 efi.systab->hdr.revision >> 16,
524 efi.systab->hdr.revision & 0xffff);
525
526 /* Show what we know for posterity */
527 c16 = __va(efi.systab->fw_vendor);
528 if (c16) {
529 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
530 vendor[i] = *c16++;
531 vendor[i] = '\0';
532 }
533
534 printk(KERN_INFO "EFI v%u.%.02u by %s:",
535 efi.systab->hdr.revision >> 16,
536 efi.systab->hdr.revision & 0xffff, vendor);
537
538 palo_phys = EFI_INVALID_TABLE_ADDR;
539
540 if (efi_config_init(arch_tables) != 0)
541 return;
542
543 if (palo_phys != EFI_INVALID_TABLE_ADDR)
544 handle_palo(palo_phys);
545
546 runtime = __va(efi.systab->runtime);
547 efi.get_time = phys_get_time;
548 efi.set_time = phys_set_time;
549 efi.get_wakeup_time = phys_get_wakeup_time;
550 efi.set_wakeup_time = phys_set_wakeup_time;
551 efi.get_variable = phys_get_variable;
552 efi.get_next_variable = phys_get_next_variable;
553 efi.set_variable = phys_set_variable;
554 efi.get_next_high_mono_count = phys_get_next_high_mono_count;
555 efi.reset_system = phys_reset_system;
556
557 efi_map_start = __va(ia64_boot_param->efi_memmap);
558 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
559 efi_desc_size = ia64_boot_param->efi_memdesc_size;
560
561#if EFI_DEBUG
562 /* print EFI memory map: */
563 {
564 efi_memory_desc_t *md;
565 void *p;
566
567 for (i = 0, p = efi_map_start; p < efi_map_end;
568 ++i, p += efi_desc_size)
569 {
570 const char *unit;
571 unsigned long size;
572 char buf[64];
573
574 md = p;
575 size = md->num_pages << EFI_PAGE_SHIFT;
576
577 if ((size >> 40) > 0) {
578 size >>= 40;
579 unit = "TB";
580 } else if ((size >> 30) > 0) {
581 size >>= 30;
582 unit = "GB";
583 } else if ((size >> 20) > 0) {
584 size >>= 20;
585 unit = "MB";
586 } else {
587 size >>= 10;
588 unit = "KB";
589 }
590
591 printk("mem%02d: %s "
592 "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
593 i, efi_md_typeattr_format(buf, sizeof(buf), md),
594 md->phys_addr,
595 md->phys_addr + efi_md_size(md), size, unit);
596 }
597 }
598#endif
599
600 efi_map_pal_code();
601 efi_enter_virtual_mode();
602}
603
604void
605efi_enter_virtual_mode (void)
606{
607 void *efi_map_start, *efi_map_end, *p;
608 efi_memory_desc_t *md;
609 efi_status_t status;
610 u64 efi_desc_size;
611
612 efi_map_start = __va(ia64_boot_param->efi_memmap);
613 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
614 efi_desc_size = ia64_boot_param->efi_memdesc_size;
615
616 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
617 md = p;
618 if (md->attribute & EFI_MEMORY_RUNTIME) {
619 /*
620 * Some descriptors have multiple bits set, so the
621 * order of the tests is relevant.
622 */
623 if (md->attribute & EFI_MEMORY_WB) {
624 md->virt_addr = (u64) __va(md->phys_addr);
625 } else if (md->attribute & EFI_MEMORY_UC) {
626 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
627 } else if (md->attribute & EFI_MEMORY_WC) {
628#if 0
629 md->virt_addr = ia64_remap(md->phys_addr,
630 (_PAGE_A |
631 _PAGE_P |
632 _PAGE_D |
633 _PAGE_MA_WC |
634 _PAGE_PL_0 |
635 _PAGE_AR_RW));
636#else
637 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
638 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
639#endif
640 } else if (md->attribute & EFI_MEMORY_WT) {
641#if 0
642 md->virt_addr = ia64_remap(md->phys_addr,
643 (_PAGE_A |
644 _PAGE_P |
645 _PAGE_D |
646 _PAGE_MA_WT |
647 _PAGE_PL_0 |
648 _PAGE_AR_RW));
649#else
650 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
651 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
652#endif
653 }
654 }
655 }
656
657 status = efi_call_phys(__va(runtime->set_virtual_address_map),
658 ia64_boot_param->efi_memmap_size,
659 efi_desc_size,
660 ia64_boot_param->efi_memdesc_version,
661 ia64_boot_param->efi_memmap);
662 if (status != EFI_SUCCESS) {
663 printk(KERN_WARNING "warning: unable to switch EFI into "
664 "virtual mode (status=%lu)\n", status);
665 return;
666 }
667
668 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
669
670 /*
671 * Now that EFI is in virtual mode, we call the EFI functions more
672 * efficiently:
673 */
674 efi.get_time = virt_get_time;
675 efi.set_time = virt_set_time;
676 efi.get_wakeup_time = virt_get_wakeup_time;
677 efi.set_wakeup_time = virt_set_wakeup_time;
678 efi.get_variable = virt_get_variable;
679 efi.get_next_variable = virt_get_next_variable;
680 efi.set_variable = virt_set_variable;
681 efi.get_next_high_mono_count = virt_get_next_high_mono_count;
682 efi.reset_system = virt_reset_system;
683}
684
685/*
686 * Walk the EFI memory map looking for the I/O port range. There can only be
687 * one entry of this type, other I/O port ranges should be described via ACPI.
688 */
689u64
690efi_get_iobase (void)
691{
692 void *efi_map_start, *efi_map_end, *p;
693 efi_memory_desc_t *md;
694 u64 efi_desc_size;
695
696 efi_map_start = __va(ia64_boot_param->efi_memmap);
697 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
698 efi_desc_size = ia64_boot_param->efi_memdesc_size;
699
700 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
701 md = p;
702 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
703 if (md->attribute & EFI_MEMORY_UC)
704 return md->phys_addr;
705 }
706 }
707 return 0;
708}
709
710static struct kern_memdesc *
711kern_memory_descriptor (unsigned long phys_addr)
712{
713 struct kern_memdesc *md;
714
715 for (md = kern_memmap; md->start != ~0UL; md++) {
716 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
717 return md;
718 }
719 return NULL;
720}
721
722static efi_memory_desc_t *
723efi_memory_descriptor (unsigned long phys_addr)
724{
725 void *efi_map_start, *efi_map_end, *p;
726 efi_memory_desc_t *md;
727 u64 efi_desc_size;
728
729 efi_map_start = __va(ia64_boot_param->efi_memmap);
730 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
731 efi_desc_size = ia64_boot_param->efi_memdesc_size;
732
733 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
734 md = p;
735
736 if (phys_addr - md->phys_addr < efi_md_size(md))
737 return md;
738 }
739 return NULL;
740}
741
742static int
743efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
744{
745 void *efi_map_start, *efi_map_end, *p;
746 efi_memory_desc_t *md;
747 u64 efi_desc_size;
748 unsigned long end;
749
750 efi_map_start = __va(ia64_boot_param->efi_memmap);
751 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
752 efi_desc_size = ia64_boot_param->efi_memdesc_size;
753
754 end = phys_addr + size;
755
756 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
757 md = p;
758 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
759 return 1;
760 }
761 return 0;
762}
763
764int
765efi_mem_type (unsigned long phys_addr)
766{
767 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
768
769 if (md)
770 return md->type;
771 return -EINVAL;
772}
773
774u64
775efi_mem_attributes (unsigned long phys_addr)
776{
777 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
778
779 if (md)
780 return md->attribute;
781 return 0;
782}
783EXPORT_SYMBOL(efi_mem_attributes);
784
785u64
786efi_mem_attribute (unsigned long phys_addr, unsigned long size)
787{
788 unsigned long end = phys_addr + size;
789 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
790 u64 attr;
791
792 if (!md)
793 return 0;
794
795 /*
796 * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
797 * the kernel that firmware needs this region mapped.
798 */
799 attr = md->attribute & ~EFI_MEMORY_RUNTIME;
800 do {
801 unsigned long md_end = efi_md_end(md);
802
803 if (end <= md_end)
804 return attr;
805
806 md = efi_memory_descriptor(md_end);
807 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
808 return 0;
809 } while (md);
810 return 0; /* never reached */
811}
812
813u64
814kern_mem_attribute (unsigned long phys_addr, unsigned long size)
815{
816 unsigned long end = phys_addr + size;
817 struct kern_memdesc *md;
818 u64 attr;
819
820 /*
821 * This is a hack for ioremap calls before we set up kern_memmap.
822 * Maybe we should do efi_memmap_init() earlier instead.
823 */
824 if (!kern_memmap) {
825 attr = efi_mem_attribute(phys_addr, size);
826 if (attr & EFI_MEMORY_WB)
827 return EFI_MEMORY_WB;
828 return 0;
829 }
830
831 md = kern_memory_descriptor(phys_addr);
832 if (!md)
833 return 0;
834
835 attr = md->attribute;
836 do {
837 unsigned long md_end = kmd_end(md);
838
839 if (end <= md_end)
840 return attr;
841
842 md = kern_memory_descriptor(md_end);
843 if (!md || md->attribute != attr)
844 return 0;
845 } while (md);
846 return 0; /* never reached */
847}
848
849int
850valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
851{
852 u64 attr;
853
854 /*
855 * /dev/mem reads and writes use copy_to_user(), which implicitly
856 * uses a granule-sized kernel identity mapping. It's really
857 * only safe to do this for regions in kern_memmap. For more
858 * details, see Documentation/ia64/aliasing.rst.
859 */
860 attr = kern_mem_attribute(phys_addr, size);
861 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
862 return 1;
863 return 0;
864}
865
866int
867valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
868{
869 unsigned long phys_addr = pfn << PAGE_SHIFT;
870 u64 attr;
871
872 attr = efi_mem_attribute(phys_addr, size);
873
874 /*
875 * /dev/mem mmap uses normal user pages, so we don't need the entire
876 * granule, but the entire region we're mapping must support the same
877 * attribute.
878 */
879 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
880 return 1;
881
882 /*
883 * Intel firmware doesn't tell us about all the MMIO regions, so
884 * in general we have to allow mmap requests. But if EFI *does*
885 * tell us about anything inside this region, we should deny it.
886 * The user can always map a smaller region to avoid the overlap.
887 */
888 if (efi_memmap_intersects(phys_addr, size))
889 return 0;
890
891 return 1;
892}
893
894pgprot_t
895phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
896 pgprot_t vma_prot)
897{
898 unsigned long phys_addr = pfn << PAGE_SHIFT;
899 u64 attr;
900
901 /*
902 * For /dev/mem mmap, we use user mappings, but if the region is
903 * in kern_memmap (and hence may be covered by a kernel mapping),
904 * we must use the same attribute as the kernel mapping.
905 */
906 attr = kern_mem_attribute(phys_addr, size);
907 if (attr & EFI_MEMORY_WB)
908 return pgprot_cacheable(vma_prot);
909 else if (attr & EFI_MEMORY_UC)
910 return pgprot_noncached(vma_prot);
911
912 /*
913 * Some chipsets don't support UC access to memory. If
914 * WB is supported, we prefer that.
915 */
916 if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
917 return pgprot_cacheable(vma_prot);
918
919 return pgprot_noncached(vma_prot);
920}
921
922int __init
923efi_uart_console_only(void)
924{
925 efi_status_t status;
926 char *s, name[] = "ConOut";
927 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
928 efi_char16_t *utf16, name_utf16[32];
929 unsigned char data[1024];
930 unsigned long size = sizeof(data);
931 struct efi_generic_dev_path *hdr, *end_addr;
932 int uart = 0;
933
934 /* Convert to UTF-16 */
935 utf16 = name_utf16;
936 s = name;
937 while (*s)
938 *utf16++ = *s++ & 0x7f;
939 *utf16 = 0;
940
941 status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
942 if (status != EFI_SUCCESS) {
943 printk(KERN_ERR "No EFI %s variable?\n", name);
944 return 0;
945 }
946
947 hdr = (struct efi_generic_dev_path *) data;
948 end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
949 while (hdr < end_addr) {
950 if (hdr->type == EFI_DEV_MSG &&
951 hdr->sub_type == EFI_DEV_MSG_UART)
952 uart = 1;
953 else if (hdr->type == EFI_DEV_END_PATH ||
954 hdr->type == EFI_DEV_END_PATH2) {
955 if (!uart)
956 return 0;
957 if (hdr->sub_type == EFI_DEV_END_ENTIRE)
958 return 1;
959 uart = 0;
960 }
961 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
962 }
963 printk(KERN_ERR "Malformed %s value\n", name);
964 return 0;
965}
966
967/*
968 * Look for the first granule aligned memory descriptor memory
969 * that is big enough to hold EFI memory map. Make sure this
970 * descriptor is at least granule sized so it does not get trimmed
971 */
972struct kern_memdesc *
973find_memmap_space (void)
974{
975 u64 contig_low=0, contig_high=0;
976 u64 as = 0, ae;
977 void *efi_map_start, *efi_map_end, *p, *q;
978 efi_memory_desc_t *md, *pmd = NULL, *check_md;
979 u64 space_needed, efi_desc_size;
980 unsigned long total_mem = 0;
981
982 efi_map_start = __va(ia64_boot_param->efi_memmap);
983 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
984 efi_desc_size = ia64_boot_param->efi_memdesc_size;
985
986 /*
987 * Worst case: we need 3 kernel descriptors for each efi descriptor
988 * (if every entry has a WB part in the middle, and UC head and tail),
989 * plus one for the end marker.
990 */
991 space_needed = sizeof(kern_memdesc_t) *
992 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
993
994 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
995 md = p;
996 if (!efi_wb(md)) {
997 continue;
998 }
999 if (pmd == NULL || !efi_wb(pmd) ||
1000 efi_md_end(pmd) != md->phys_addr) {
1001 contig_low = GRANULEROUNDUP(md->phys_addr);
1002 contig_high = efi_md_end(md);
1003 for (q = p + efi_desc_size; q < efi_map_end;
1004 q += efi_desc_size) {
1005 check_md = q;
1006 if (!efi_wb(check_md))
1007 break;
1008 if (contig_high != check_md->phys_addr)
1009 break;
1010 contig_high = efi_md_end(check_md);
1011 }
1012 contig_high = GRANULEROUNDDOWN(contig_high);
1013 }
1014 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1015 continue;
1016
1017 /* Round ends inward to granule boundaries */
1018 as = max(contig_low, md->phys_addr);
1019 ae = min(contig_high, efi_md_end(md));
1020
1021 /* keep within max_addr= and min_addr= command line arg */
1022 as = max(as, min_addr);
1023 ae = min(ae, max_addr);
1024 if (ae <= as)
1025 continue;
1026
1027 /* avoid going over mem= command line arg */
1028 if (total_mem + (ae - as) > mem_limit)
1029 ae -= total_mem + (ae - as) - mem_limit;
1030
1031 if (ae <= as)
1032 continue;
1033
1034 if (ae - as > space_needed)
1035 break;
1036 }
1037 if (p >= efi_map_end)
1038 panic("Can't allocate space for kernel memory descriptors");
1039
1040 return __va(as);
1041}
1042
1043/*
1044 * Walk the EFI memory map and gather all memory available for kernel
1045 * to use. We can allocate partial granules only if the unavailable
1046 * parts exist, and are WB.
1047 */
1048unsigned long
1049efi_memmap_init(u64 *s, u64 *e)
1050{
1051 struct kern_memdesc *k, *prev = NULL;
1052 u64 contig_low=0, contig_high=0;
1053 u64 as, ae, lim;
1054 void *efi_map_start, *efi_map_end, *p, *q;
1055 efi_memory_desc_t *md, *pmd = NULL, *check_md;
1056 u64 efi_desc_size;
1057 unsigned long total_mem = 0;
1058
1059 k = kern_memmap = find_memmap_space();
1060
1061 efi_map_start = __va(ia64_boot_param->efi_memmap);
1062 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1063 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1064
1065 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1066 md = p;
1067 if (!efi_wb(md)) {
1068 if (efi_uc(md) &&
1069 (md->type == EFI_CONVENTIONAL_MEMORY ||
1070 md->type == EFI_BOOT_SERVICES_DATA)) {
1071 k->attribute = EFI_MEMORY_UC;
1072 k->start = md->phys_addr;
1073 k->num_pages = md->num_pages;
1074 k++;
1075 }
1076 continue;
1077 }
1078 if (pmd == NULL || !efi_wb(pmd) ||
1079 efi_md_end(pmd) != md->phys_addr) {
1080 contig_low = GRANULEROUNDUP(md->phys_addr);
1081 contig_high = efi_md_end(md);
1082 for (q = p + efi_desc_size; q < efi_map_end;
1083 q += efi_desc_size) {
1084 check_md = q;
1085 if (!efi_wb(check_md))
1086 break;
1087 if (contig_high != check_md->phys_addr)
1088 break;
1089 contig_high = efi_md_end(check_md);
1090 }
1091 contig_high = GRANULEROUNDDOWN(contig_high);
1092 }
1093 if (!is_memory_available(md))
1094 continue;
1095
1096 /*
1097 * Round ends inward to granule boundaries
1098 * Give trimmings to uncached allocator
1099 */
1100 if (md->phys_addr < contig_low) {
1101 lim = min(efi_md_end(md), contig_low);
1102 if (efi_uc(md)) {
1103 if (k > kern_memmap &&
1104 (k-1)->attribute == EFI_MEMORY_UC &&
1105 kmd_end(k-1) == md->phys_addr) {
1106 (k-1)->num_pages +=
1107 (lim - md->phys_addr)
1108 >> EFI_PAGE_SHIFT;
1109 } else {
1110 k->attribute = EFI_MEMORY_UC;
1111 k->start = md->phys_addr;
1112 k->num_pages = (lim - md->phys_addr)
1113 >> EFI_PAGE_SHIFT;
1114 k++;
1115 }
1116 }
1117 as = contig_low;
1118 } else
1119 as = md->phys_addr;
1120
1121 if (efi_md_end(md) > contig_high) {
1122 lim = max(md->phys_addr, contig_high);
1123 if (efi_uc(md)) {
1124 if (lim == md->phys_addr && k > kern_memmap &&
1125 (k-1)->attribute == EFI_MEMORY_UC &&
1126 kmd_end(k-1) == md->phys_addr) {
1127 (k-1)->num_pages += md->num_pages;
1128 } else {
1129 k->attribute = EFI_MEMORY_UC;
1130 k->start = lim;
1131 k->num_pages = (efi_md_end(md) - lim)
1132 >> EFI_PAGE_SHIFT;
1133 k++;
1134 }
1135 }
1136 ae = contig_high;
1137 } else
1138 ae = efi_md_end(md);
1139
1140 /* keep within max_addr= and min_addr= command line arg */
1141 as = max(as, min_addr);
1142 ae = min(ae, max_addr);
1143 if (ae <= as)
1144 continue;
1145
1146 /* avoid going over mem= command line arg */
1147 if (total_mem + (ae - as) > mem_limit)
1148 ae -= total_mem + (ae - as) - mem_limit;
1149
1150 if (ae <= as)
1151 continue;
1152 if (prev && kmd_end(prev) == md->phys_addr) {
1153 prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1154 total_mem += ae - as;
1155 continue;
1156 }
1157 k->attribute = EFI_MEMORY_WB;
1158 k->start = as;
1159 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1160 total_mem += ae - as;
1161 prev = k++;
1162 }
1163 k->start = ~0L; /* end-marker */
1164
1165 /* reserve the memory we are using for kern_memmap */
1166 *s = (u64)kern_memmap;
1167 *e = (u64)++k;
1168
1169 return total_mem;
1170}
1171
1172void
1173efi_initialize_iomem_resources(struct resource *code_resource,
1174 struct resource *data_resource,
1175 struct resource *bss_resource)
1176{
1177 struct resource *res;
1178 void *efi_map_start, *efi_map_end, *p;
1179 efi_memory_desc_t *md;
1180 u64 efi_desc_size;
1181 char *name;
1182 unsigned long flags, desc;
1183
1184 efi_map_start = __va(ia64_boot_param->efi_memmap);
1185 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1186 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1187
1188 res = NULL;
1189
1190 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1191 md = p;
1192
1193 if (md->num_pages == 0) /* should not happen */
1194 continue;
1195
1196 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1197 desc = IORES_DESC_NONE;
1198
1199 switch (md->type) {
1200
1201 case EFI_MEMORY_MAPPED_IO:
1202 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1203 continue;
1204
1205 case EFI_LOADER_CODE:
1206 case EFI_LOADER_DATA:
1207 case EFI_BOOT_SERVICES_DATA:
1208 case EFI_BOOT_SERVICES_CODE:
1209 case EFI_CONVENTIONAL_MEMORY:
1210 if (md->attribute & EFI_MEMORY_WP) {
1211 name = "System ROM";
1212 flags |= IORESOURCE_READONLY;
1213 } else if (md->attribute == EFI_MEMORY_UC) {
1214 name = "Uncached RAM";
1215 } else {
1216 name = "System RAM";
1217 flags |= IORESOURCE_SYSRAM;
1218 }
1219 break;
1220
1221 case EFI_ACPI_MEMORY_NVS:
1222 name = "ACPI Non-volatile Storage";
1223 desc = IORES_DESC_ACPI_NV_STORAGE;
1224 break;
1225
1226 case EFI_UNUSABLE_MEMORY:
1227 name = "reserved";
1228 flags |= IORESOURCE_DISABLED;
1229 break;
1230
1231 case EFI_PERSISTENT_MEMORY:
1232 name = "Persistent Memory";
1233 desc = IORES_DESC_PERSISTENT_MEMORY;
1234 break;
1235
1236 case EFI_RESERVED_TYPE:
1237 case EFI_RUNTIME_SERVICES_CODE:
1238 case EFI_RUNTIME_SERVICES_DATA:
1239 case EFI_ACPI_RECLAIM_MEMORY:
1240 default:
1241 name = "reserved";
1242 break;
1243 }
1244
1245 if ((res = kzalloc(sizeof(struct resource),
1246 GFP_KERNEL)) == NULL) {
1247 printk(KERN_ERR
1248 "failed to allocate resource for iomem\n");
1249 return;
1250 }
1251
1252 res->name = name;
1253 res->start = md->phys_addr;
1254 res->end = md->phys_addr + efi_md_size(md) - 1;
1255 res->flags = flags;
1256 res->desc = desc;
1257
1258 if (insert_resource(&iomem_resource, res) < 0)
1259 kfree(res);
1260 else {
1261 /*
1262 * We don't know which region contains
1263 * kernel data so we try it repeatedly and
1264 * let the resource manager test it.
1265 */
1266 insert_resource(res, code_resource);
1267 insert_resource(res, data_resource);
1268 insert_resource(res, bss_resource);
1269#ifdef CONFIG_KEXEC
1270 insert_resource(res, &efi_memmap_res);
1271 insert_resource(res, &boot_param_res);
1272 if (crashk_res.end > crashk_res.start)
1273 insert_resource(res, &crashk_res);
1274#endif
1275 }
1276 }
1277}
1278
1279#ifdef CONFIG_KEXEC
1280/* find a block of memory aligned to 64M exclude reserved regions
1281 rsvd_regions are sorted
1282 */
1283unsigned long __init
1284kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1285{
1286 int i;
1287 u64 start, end;
1288 u64 alignment = 1UL << _PAGE_SIZE_64M;
1289 void *efi_map_start, *efi_map_end, *p;
1290 efi_memory_desc_t *md;
1291 u64 efi_desc_size;
1292
1293 efi_map_start = __va(ia64_boot_param->efi_memmap);
1294 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1295 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1296
1297 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1298 md = p;
1299 if (!efi_wb(md))
1300 continue;
1301 start = ALIGN(md->phys_addr, alignment);
1302 end = efi_md_end(md);
1303 for (i = 0; i < n; i++) {
1304 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1305 if (__pa(r[i].start) > start + size)
1306 return start;
1307 start = ALIGN(__pa(r[i].end), alignment);
1308 if (i < n-1 &&
1309 __pa(r[i+1].start) < start + size)
1310 continue;
1311 else
1312 break;
1313 }
1314 }
1315 if (end > start + size)
1316 return start;
1317 }
1318
1319 printk(KERN_WARNING
1320 "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1321 return ~0UL;
1322}
1323#endif
1324
1325#ifdef CONFIG_CRASH_DUMP
1326/* locate the size find a the descriptor at a certain address */
1327unsigned long __init
1328vmcore_find_descriptor_size (unsigned long address)
1329{
1330 void *efi_map_start, *efi_map_end, *p;
1331 efi_memory_desc_t *md;
1332 u64 efi_desc_size;
1333 unsigned long ret = 0;
1334
1335 efi_map_start = __va(ia64_boot_param->efi_memmap);
1336 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1337 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1338
1339 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1340 md = p;
1341 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1342 && md->phys_addr == address) {
1343 ret = efi_md_size(md);
1344 break;
1345 }
1346 }
1347
1348 if (ret == 0)
1349 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1350
1351 return ret;
1352}
1353#endif
1/*
2 * Extensible Firmware Interface
3 *
4 * Based on Extensible Firmware Interface Specification version 0.9
5 * April 30, 1999
6 *
7 * Copyright (C) 1999 VA Linux Systems
8 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
9 * Copyright (C) 1999-2003 Hewlett-Packard Co.
10 * David Mosberger-Tang <davidm@hpl.hp.com>
11 * Stephane Eranian <eranian@hpl.hp.com>
12 * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
13 * Bjorn Helgaas <bjorn.helgaas@hp.com>
14 *
15 * All EFI Runtime Services are not implemented yet as EFI only
16 * supports physical mode addressing on SoftSDV. This is to be fixed
17 * in a future version. --drummond 1999-07-20
18 *
19 * Implemented EFI runtime services and virtual mode calls. --davidm
20 *
21 * Goutham Rao: <goutham.rao@intel.com>
22 * Skip non-WB memory and ignore empty memory ranges.
23 */
24#include <linux/module.h>
25#include <linux/bootmem.h>
26#include <linux/crash_dump.h>
27#include <linux/kernel.h>
28#include <linux/init.h>
29#include <linux/types.h>
30#include <linux/slab.h>
31#include <linux/time.h>
32#include <linux/efi.h>
33#include <linux/kexec.h>
34#include <linux/mm.h>
35
36#include <asm/io.h>
37#include <asm/kregs.h>
38#include <asm/meminit.h>
39#include <asm/pgtable.h>
40#include <asm/processor.h>
41#include <asm/mca.h>
42#include <asm/setup.h>
43#include <asm/tlbflush.h>
44
45#define EFI_DEBUG 0
46
47extern efi_status_t efi_call_phys (void *, ...);
48
49struct efi efi;
50EXPORT_SYMBOL(efi);
51static efi_runtime_services_t *runtime;
52static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
53
54#define efi_call_virt(f, args...) (*(f))(args)
55
56#define STUB_GET_TIME(prefix, adjust_arg) \
57static efi_status_t \
58prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \
59{ \
60 struct ia64_fpreg fr[6]; \
61 efi_time_cap_t *atc = NULL; \
62 efi_status_t ret; \
63 \
64 if (tc) \
65 atc = adjust_arg(tc); \
66 ia64_save_scratch_fpregs(fr); \
67 ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), \
68 adjust_arg(tm), atc); \
69 ia64_load_scratch_fpregs(fr); \
70 return ret; \
71}
72
73#define STUB_SET_TIME(prefix, adjust_arg) \
74static efi_status_t \
75prefix##_set_time (efi_time_t *tm) \
76{ \
77 struct ia64_fpreg fr[6]; \
78 efi_status_t ret; \
79 \
80 ia64_save_scratch_fpregs(fr); \
81 ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), \
82 adjust_arg(tm)); \
83 ia64_load_scratch_fpregs(fr); \
84 return ret; \
85}
86
87#define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \
88static efi_status_t \
89prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, \
90 efi_time_t *tm) \
91{ \
92 struct ia64_fpreg fr[6]; \
93 efi_status_t ret; \
94 \
95 ia64_save_scratch_fpregs(fr); \
96 ret = efi_call_##prefix( \
97 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time), \
98 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm)); \
99 ia64_load_scratch_fpregs(fr); \
100 return ret; \
101}
102
103#define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \
104static efi_status_t \
105prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \
106{ \
107 struct ia64_fpreg fr[6]; \
108 efi_time_t *atm = NULL; \
109 efi_status_t ret; \
110 \
111 if (tm) \
112 atm = adjust_arg(tm); \
113 ia64_save_scratch_fpregs(fr); \
114 ret = efi_call_##prefix( \
115 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time), \
116 enabled, atm); \
117 ia64_load_scratch_fpregs(fr); \
118 return ret; \
119}
120
121#define STUB_GET_VARIABLE(prefix, adjust_arg) \
122static efi_status_t \
123prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \
124 unsigned long *data_size, void *data) \
125{ \
126 struct ia64_fpreg fr[6]; \
127 u32 *aattr = NULL; \
128 efi_status_t ret; \
129 \
130 if (attr) \
131 aattr = adjust_arg(attr); \
132 ia64_save_scratch_fpregs(fr); \
133 ret = efi_call_##prefix( \
134 (efi_get_variable_t *) __va(runtime->get_variable), \
135 adjust_arg(name), adjust_arg(vendor), aattr, \
136 adjust_arg(data_size), adjust_arg(data)); \
137 ia64_load_scratch_fpregs(fr); \
138 return ret; \
139}
140
141#define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \
142static efi_status_t \
143prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, \
144 efi_guid_t *vendor) \
145{ \
146 struct ia64_fpreg fr[6]; \
147 efi_status_t ret; \
148 \
149 ia64_save_scratch_fpregs(fr); \
150 ret = efi_call_##prefix( \
151 (efi_get_next_variable_t *) __va(runtime->get_next_variable), \
152 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor)); \
153 ia64_load_scratch_fpregs(fr); \
154 return ret; \
155}
156
157#define STUB_SET_VARIABLE(prefix, adjust_arg) \
158static efi_status_t \
159prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, \
160 u32 attr, unsigned long data_size, \
161 void *data) \
162{ \
163 struct ia64_fpreg fr[6]; \
164 efi_status_t ret; \
165 \
166 ia64_save_scratch_fpregs(fr); \
167 ret = efi_call_##prefix( \
168 (efi_set_variable_t *) __va(runtime->set_variable), \
169 adjust_arg(name), adjust_arg(vendor), attr, data_size, \
170 adjust_arg(data)); \
171 ia64_load_scratch_fpregs(fr); \
172 return ret; \
173}
174
175#define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \
176static efi_status_t \
177prefix##_get_next_high_mono_count (u32 *count) \
178{ \
179 struct ia64_fpreg fr[6]; \
180 efi_status_t ret; \
181 \
182 ia64_save_scratch_fpregs(fr); \
183 ret = efi_call_##prefix((efi_get_next_high_mono_count_t *) \
184 __va(runtime->get_next_high_mono_count), \
185 adjust_arg(count)); \
186 ia64_load_scratch_fpregs(fr); \
187 return ret; \
188}
189
190#define STUB_RESET_SYSTEM(prefix, adjust_arg) \
191static void \
192prefix##_reset_system (int reset_type, efi_status_t status, \
193 unsigned long data_size, efi_char16_t *data) \
194{ \
195 struct ia64_fpreg fr[6]; \
196 efi_char16_t *adata = NULL; \
197 \
198 if (data) \
199 adata = adjust_arg(data); \
200 \
201 ia64_save_scratch_fpregs(fr); \
202 efi_call_##prefix( \
203 (efi_reset_system_t *) __va(runtime->reset_system), \
204 reset_type, status, data_size, adata); \
205 /* should not return, but just in case... */ \
206 ia64_load_scratch_fpregs(fr); \
207}
208
209#define phys_ptr(arg) ((__typeof__(arg)) ia64_tpa(arg))
210
211STUB_GET_TIME(phys, phys_ptr)
212STUB_SET_TIME(phys, phys_ptr)
213STUB_GET_WAKEUP_TIME(phys, phys_ptr)
214STUB_SET_WAKEUP_TIME(phys, phys_ptr)
215STUB_GET_VARIABLE(phys, phys_ptr)
216STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
217STUB_SET_VARIABLE(phys, phys_ptr)
218STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
219STUB_RESET_SYSTEM(phys, phys_ptr)
220
221#define id(arg) arg
222
223STUB_GET_TIME(virt, id)
224STUB_SET_TIME(virt, id)
225STUB_GET_WAKEUP_TIME(virt, id)
226STUB_SET_WAKEUP_TIME(virt, id)
227STUB_GET_VARIABLE(virt, id)
228STUB_GET_NEXT_VARIABLE(virt, id)
229STUB_SET_VARIABLE(virt, id)
230STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
231STUB_RESET_SYSTEM(virt, id)
232
233void
234efi_gettimeofday (struct timespec *ts)
235{
236 efi_time_t tm;
237
238 if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
239 memset(ts, 0, sizeof(*ts));
240 return;
241 }
242
243 ts->tv_sec = mktime(tm.year, tm.month, tm.day,
244 tm.hour, tm.minute, tm.second);
245 ts->tv_nsec = tm.nanosecond;
246}
247
248static int
249is_memory_available (efi_memory_desc_t *md)
250{
251 if (!(md->attribute & EFI_MEMORY_WB))
252 return 0;
253
254 switch (md->type) {
255 case EFI_LOADER_CODE:
256 case EFI_LOADER_DATA:
257 case EFI_BOOT_SERVICES_CODE:
258 case EFI_BOOT_SERVICES_DATA:
259 case EFI_CONVENTIONAL_MEMORY:
260 return 1;
261 }
262 return 0;
263}
264
265typedef struct kern_memdesc {
266 u64 attribute;
267 u64 start;
268 u64 num_pages;
269} kern_memdesc_t;
270
271static kern_memdesc_t *kern_memmap;
272
273#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
274
275static inline u64
276kmd_end(kern_memdesc_t *kmd)
277{
278 return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
279}
280
281static inline u64
282efi_md_end(efi_memory_desc_t *md)
283{
284 return (md->phys_addr + efi_md_size(md));
285}
286
287static inline int
288efi_wb(efi_memory_desc_t *md)
289{
290 return (md->attribute & EFI_MEMORY_WB);
291}
292
293static inline int
294efi_uc(efi_memory_desc_t *md)
295{
296 return (md->attribute & EFI_MEMORY_UC);
297}
298
299static void
300walk (efi_freemem_callback_t callback, void *arg, u64 attr)
301{
302 kern_memdesc_t *k;
303 u64 start, end, voff;
304
305 voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
306 for (k = kern_memmap; k->start != ~0UL; k++) {
307 if (k->attribute != attr)
308 continue;
309 start = PAGE_ALIGN(k->start);
310 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
311 if (start < end)
312 if ((*callback)(start + voff, end + voff, arg) < 0)
313 return;
314 }
315}
316
317/*
318 * Walk the EFI memory map and call CALLBACK once for each EFI memory
319 * descriptor that has memory that is available for OS use.
320 */
321void
322efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
323{
324 walk(callback, arg, EFI_MEMORY_WB);
325}
326
327/*
328 * Walk the EFI memory map and call CALLBACK once for each EFI memory
329 * descriptor that has memory that is available for uncached allocator.
330 */
331void
332efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
333{
334 walk(callback, arg, EFI_MEMORY_UC);
335}
336
337/*
338 * Look for the PAL_CODE region reported by EFI and map it using an
339 * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor
340 * Abstraction Layer chapter 11 in ADAG
341 */
342void *
343efi_get_pal_addr (void)
344{
345 void *efi_map_start, *efi_map_end, *p;
346 efi_memory_desc_t *md;
347 u64 efi_desc_size;
348 int pal_code_count = 0;
349 u64 vaddr, mask;
350
351 efi_map_start = __va(ia64_boot_param->efi_memmap);
352 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
353 efi_desc_size = ia64_boot_param->efi_memdesc_size;
354
355 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
356 md = p;
357 if (md->type != EFI_PAL_CODE)
358 continue;
359
360 if (++pal_code_count > 1) {
361 printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
362 "dropped @ %llx\n", md->phys_addr);
363 continue;
364 }
365 /*
366 * The only ITLB entry in region 7 that is used is the one
367 * installed by __start(). That entry covers a 64MB range.
368 */
369 mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
370 vaddr = PAGE_OFFSET + md->phys_addr;
371
372 /*
373 * We must check that the PAL mapping won't overlap with the
374 * kernel mapping.
375 *
376 * PAL code is guaranteed to be aligned on a power of 2 between
377 * 4k and 256KB and that only one ITR is needed to map it. This
378 * implies that the PAL code is always aligned on its size,
379 * i.e., the closest matching page size supported by the TLB.
380 * Therefore PAL code is guaranteed never to cross a 64MB unless
381 * it is bigger than 64MB (very unlikely!). So for now the
382 * following test is enough to determine whether or not we need
383 * a dedicated ITR for the PAL code.
384 */
385 if ((vaddr & mask) == (KERNEL_START & mask)) {
386 printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
387 __func__);
388 continue;
389 }
390
391 if (efi_md_size(md) > IA64_GRANULE_SIZE)
392 panic("Whoa! PAL code size bigger than a granule!");
393
394#if EFI_DEBUG
395 mask = ~((1 << IA64_GRANULE_SHIFT) - 1);
396
397 printk(KERN_INFO "CPU %d: mapping PAL code "
398 "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
399 smp_processor_id(), md->phys_addr,
400 md->phys_addr + efi_md_size(md),
401 vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
402#endif
403 return __va(md->phys_addr);
404 }
405 printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
406 __func__);
407 return NULL;
408}
409
410
411static u8 __init palo_checksum(u8 *buffer, u32 length)
412{
413 u8 sum = 0;
414 u8 *end = buffer + length;
415
416 while (buffer < end)
417 sum = (u8) (sum + *(buffer++));
418
419 return sum;
420}
421
422/*
423 * Parse and handle PALO table which is published at:
424 * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
425 */
426static void __init handle_palo(unsigned long palo_phys)
427{
428 struct palo_table *palo = __va(palo_phys);
429 u8 checksum;
430
431 if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
432 printk(KERN_INFO "PALO signature incorrect.\n");
433 return;
434 }
435
436 checksum = palo_checksum((u8 *)palo, palo->length);
437 if (checksum) {
438 printk(KERN_INFO "PALO checksum incorrect.\n");
439 return;
440 }
441
442 setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
443}
444
445void
446efi_map_pal_code (void)
447{
448 void *pal_vaddr = efi_get_pal_addr ();
449 u64 psr;
450
451 if (!pal_vaddr)
452 return;
453
454 /*
455 * Cannot write to CRx with PSR.ic=1
456 */
457 psr = ia64_clear_ic();
458 ia64_itr(0x1, IA64_TR_PALCODE,
459 GRANULEROUNDDOWN((unsigned long) pal_vaddr),
460 pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
461 IA64_GRANULE_SHIFT);
462 paravirt_dv_serialize_data();
463 ia64_set_psr(psr); /* restore psr */
464}
465
466void __init
467efi_init (void)
468{
469 void *efi_map_start, *efi_map_end;
470 efi_config_table_t *config_tables;
471 efi_char16_t *c16;
472 u64 efi_desc_size;
473 char *cp, vendor[100] = "unknown";
474 int i;
475 unsigned long palo_phys;
476
477 /*
478 * It's too early to be able to use the standard kernel command line
479 * support...
480 */
481 for (cp = boot_command_line; *cp; ) {
482 if (memcmp(cp, "mem=", 4) == 0) {
483 mem_limit = memparse(cp + 4, &cp);
484 } else if (memcmp(cp, "max_addr=", 9) == 0) {
485 max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
486 } else if (memcmp(cp, "min_addr=", 9) == 0) {
487 min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
488 } else {
489 while (*cp != ' ' && *cp)
490 ++cp;
491 while (*cp == ' ')
492 ++cp;
493 }
494 }
495 if (min_addr != 0UL)
496 printk(KERN_INFO "Ignoring memory below %lluMB\n",
497 min_addr >> 20);
498 if (max_addr != ~0UL)
499 printk(KERN_INFO "Ignoring memory above %lluMB\n",
500 max_addr >> 20);
501
502 efi.systab = __va(ia64_boot_param->efi_systab);
503
504 /*
505 * Verify the EFI Table
506 */
507 if (efi.systab == NULL)
508 panic("Whoa! Can't find EFI system table.\n");
509 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
510 panic("Whoa! EFI system table signature incorrect\n");
511 if ((efi.systab->hdr.revision >> 16) == 0)
512 printk(KERN_WARNING "Warning: EFI system table version "
513 "%d.%02d, expected 1.00 or greater\n",
514 efi.systab->hdr.revision >> 16,
515 efi.systab->hdr.revision & 0xffff);
516
517 config_tables = __va(efi.systab->tables);
518
519 /* Show what we know for posterity */
520 c16 = __va(efi.systab->fw_vendor);
521 if (c16) {
522 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
523 vendor[i] = *c16++;
524 vendor[i] = '\0';
525 }
526
527 printk(KERN_INFO "EFI v%u.%.02u by %s:",
528 efi.systab->hdr.revision >> 16,
529 efi.systab->hdr.revision & 0xffff, vendor);
530
531 efi.mps = EFI_INVALID_TABLE_ADDR;
532 efi.acpi = EFI_INVALID_TABLE_ADDR;
533 efi.acpi20 = EFI_INVALID_TABLE_ADDR;
534 efi.smbios = EFI_INVALID_TABLE_ADDR;
535 efi.sal_systab = EFI_INVALID_TABLE_ADDR;
536 efi.boot_info = EFI_INVALID_TABLE_ADDR;
537 efi.hcdp = EFI_INVALID_TABLE_ADDR;
538 efi.uga = EFI_INVALID_TABLE_ADDR;
539
540 palo_phys = EFI_INVALID_TABLE_ADDR;
541
542 for (i = 0; i < (int) efi.systab->nr_tables; i++) {
543 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
544 efi.mps = config_tables[i].table;
545 printk(" MPS=0x%lx", config_tables[i].table);
546 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
547 efi.acpi20 = config_tables[i].table;
548 printk(" ACPI 2.0=0x%lx", config_tables[i].table);
549 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
550 efi.acpi = config_tables[i].table;
551 printk(" ACPI=0x%lx", config_tables[i].table);
552 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
553 efi.smbios = config_tables[i].table;
554 printk(" SMBIOS=0x%lx", config_tables[i].table);
555 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
556 efi.sal_systab = config_tables[i].table;
557 printk(" SALsystab=0x%lx", config_tables[i].table);
558 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
559 efi.hcdp = config_tables[i].table;
560 printk(" HCDP=0x%lx", config_tables[i].table);
561 } else if (efi_guidcmp(config_tables[i].guid,
562 PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID) == 0) {
563 palo_phys = config_tables[i].table;
564 printk(" PALO=0x%lx", config_tables[i].table);
565 }
566 }
567 printk("\n");
568
569 if (palo_phys != EFI_INVALID_TABLE_ADDR)
570 handle_palo(palo_phys);
571
572 runtime = __va(efi.systab->runtime);
573 efi.get_time = phys_get_time;
574 efi.set_time = phys_set_time;
575 efi.get_wakeup_time = phys_get_wakeup_time;
576 efi.set_wakeup_time = phys_set_wakeup_time;
577 efi.get_variable = phys_get_variable;
578 efi.get_next_variable = phys_get_next_variable;
579 efi.set_variable = phys_set_variable;
580 efi.get_next_high_mono_count = phys_get_next_high_mono_count;
581 efi.reset_system = phys_reset_system;
582
583 efi_map_start = __va(ia64_boot_param->efi_memmap);
584 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
585 efi_desc_size = ia64_boot_param->efi_memdesc_size;
586
587#if EFI_DEBUG
588 /* print EFI memory map: */
589 {
590 efi_memory_desc_t *md;
591 void *p;
592
593 for (i = 0, p = efi_map_start; p < efi_map_end;
594 ++i, p += efi_desc_size)
595 {
596 const char *unit;
597 unsigned long size;
598
599 md = p;
600 size = md->num_pages << EFI_PAGE_SHIFT;
601
602 if ((size >> 40) > 0) {
603 size >>= 40;
604 unit = "TB";
605 } else if ((size >> 30) > 0) {
606 size >>= 30;
607 unit = "GB";
608 } else if ((size >> 20) > 0) {
609 size >>= 20;
610 unit = "MB";
611 } else {
612 size >>= 10;
613 unit = "KB";
614 }
615
616 printk("mem%02d: type=%2u, attr=0x%016lx, "
617 "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
618 i, md->type, md->attribute, md->phys_addr,
619 md->phys_addr + efi_md_size(md), size, unit);
620 }
621 }
622#endif
623
624 efi_map_pal_code();
625 efi_enter_virtual_mode();
626}
627
628void
629efi_enter_virtual_mode (void)
630{
631 void *efi_map_start, *efi_map_end, *p;
632 efi_memory_desc_t *md;
633 efi_status_t status;
634 u64 efi_desc_size;
635
636 efi_map_start = __va(ia64_boot_param->efi_memmap);
637 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
638 efi_desc_size = ia64_boot_param->efi_memdesc_size;
639
640 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
641 md = p;
642 if (md->attribute & EFI_MEMORY_RUNTIME) {
643 /*
644 * Some descriptors have multiple bits set, so the
645 * order of the tests is relevant.
646 */
647 if (md->attribute & EFI_MEMORY_WB) {
648 md->virt_addr = (u64) __va(md->phys_addr);
649 } else if (md->attribute & EFI_MEMORY_UC) {
650 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
651 } else if (md->attribute & EFI_MEMORY_WC) {
652#if 0
653 md->virt_addr = ia64_remap(md->phys_addr,
654 (_PAGE_A |
655 _PAGE_P |
656 _PAGE_D |
657 _PAGE_MA_WC |
658 _PAGE_PL_0 |
659 _PAGE_AR_RW));
660#else
661 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
662 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
663#endif
664 } else if (md->attribute & EFI_MEMORY_WT) {
665#if 0
666 md->virt_addr = ia64_remap(md->phys_addr,
667 (_PAGE_A |
668 _PAGE_P |
669 _PAGE_D |
670 _PAGE_MA_WT |
671 _PAGE_PL_0 |
672 _PAGE_AR_RW));
673#else
674 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
675 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
676#endif
677 }
678 }
679 }
680
681 status = efi_call_phys(__va(runtime->set_virtual_address_map),
682 ia64_boot_param->efi_memmap_size,
683 efi_desc_size,
684 ia64_boot_param->efi_memdesc_version,
685 ia64_boot_param->efi_memmap);
686 if (status != EFI_SUCCESS) {
687 printk(KERN_WARNING "warning: unable to switch EFI into "
688 "virtual mode (status=%lu)\n", status);
689 return;
690 }
691
692 /*
693 * Now that EFI is in virtual mode, we call the EFI functions more
694 * efficiently:
695 */
696 efi.get_time = virt_get_time;
697 efi.set_time = virt_set_time;
698 efi.get_wakeup_time = virt_get_wakeup_time;
699 efi.set_wakeup_time = virt_set_wakeup_time;
700 efi.get_variable = virt_get_variable;
701 efi.get_next_variable = virt_get_next_variable;
702 efi.set_variable = virt_set_variable;
703 efi.get_next_high_mono_count = virt_get_next_high_mono_count;
704 efi.reset_system = virt_reset_system;
705}
706
707/*
708 * Walk the EFI memory map looking for the I/O port range. There can only be
709 * one entry of this type, other I/O port ranges should be described via ACPI.
710 */
711u64
712efi_get_iobase (void)
713{
714 void *efi_map_start, *efi_map_end, *p;
715 efi_memory_desc_t *md;
716 u64 efi_desc_size;
717
718 efi_map_start = __va(ia64_boot_param->efi_memmap);
719 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
720 efi_desc_size = ia64_boot_param->efi_memdesc_size;
721
722 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
723 md = p;
724 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
725 if (md->attribute & EFI_MEMORY_UC)
726 return md->phys_addr;
727 }
728 }
729 return 0;
730}
731
732static struct kern_memdesc *
733kern_memory_descriptor (unsigned long phys_addr)
734{
735 struct kern_memdesc *md;
736
737 for (md = kern_memmap; md->start != ~0UL; md++) {
738 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
739 return md;
740 }
741 return NULL;
742}
743
744static efi_memory_desc_t *
745efi_memory_descriptor (unsigned long phys_addr)
746{
747 void *efi_map_start, *efi_map_end, *p;
748 efi_memory_desc_t *md;
749 u64 efi_desc_size;
750
751 efi_map_start = __va(ia64_boot_param->efi_memmap);
752 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
753 efi_desc_size = ia64_boot_param->efi_memdesc_size;
754
755 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
756 md = p;
757
758 if (phys_addr - md->phys_addr < efi_md_size(md))
759 return md;
760 }
761 return NULL;
762}
763
764static int
765efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
766{
767 void *efi_map_start, *efi_map_end, *p;
768 efi_memory_desc_t *md;
769 u64 efi_desc_size;
770 unsigned long end;
771
772 efi_map_start = __va(ia64_boot_param->efi_memmap);
773 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
774 efi_desc_size = ia64_boot_param->efi_memdesc_size;
775
776 end = phys_addr + size;
777
778 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
779 md = p;
780 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
781 return 1;
782 }
783 return 0;
784}
785
786u32
787efi_mem_type (unsigned long phys_addr)
788{
789 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
790
791 if (md)
792 return md->type;
793 return 0;
794}
795
796u64
797efi_mem_attributes (unsigned long phys_addr)
798{
799 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
800
801 if (md)
802 return md->attribute;
803 return 0;
804}
805EXPORT_SYMBOL(efi_mem_attributes);
806
807u64
808efi_mem_attribute (unsigned long phys_addr, unsigned long size)
809{
810 unsigned long end = phys_addr + size;
811 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
812 u64 attr;
813
814 if (!md)
815 return 0;
816
817 /*
818 * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
819 * the kernel that firmware needs this region mapped.
820 */
821 attr = md->attribute & ~EFI_MEMORY_RUNTIME;
822 do {
823 unsigned long md_end = efi_md_end(md);
824
825 if (end <= md_end)
826 return attr;
827
828 md = efi_memory_descriptor(md_end);
829 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
830 return 0;
831 } while (md);
832 return 0; /* never reached */
833}
834
835u64
836kern_mem_attribute (unsigned long phys_addr, unsigned long size)
837{
838 unsigned long end = phys_addr + size;
839 struct kern_memdesc *md;
840 u64 attr;
841
842 /*
843 * This is a hack for ioremap calls before we set up kern_memmap.
844 * Maybe we should do efi_memmap_init() earlier instead.
845 */
846 if (!kern_memmap) {
847 attr = efi_mem_attribute(phys_addr, size);
848 if (attr & EFI_MEMORY_WB)
849 return EFI_MEMORY_WB;
850 return 0;
851 }
852
853 md = kern_memory_descriptor(phys_addr);
854 if (!md)
855 return 0;
856
857 attr = md->attribute;
858 do {
859 unsigned long md_end = kmd_end(md);
860
861 if (end <= md_end)
862 return attr;
863
864 md = kern_memory_descriptor(md_end);
865 if (!md || md->attribute != attr)
866 return 0;
867 } while (md);
868 return 0; /* never reached */
869}
870EXPORT_SYMBOL(kern_mem_attribute);
871
872int
873valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
874{
875 u64 attr;
876
877 /*
878 * /dev/mem reads and writes use copy_to_user(), which implicitly
879 * uses a granule-sized kernel identity mapping. It's really
880 * only safe to do this for regions in kern_memmap. For more
881 * details, see Documentation/ia64/aliasing.txt.
882 */
883 attr = kern_mem_attribute(phys_addr, size);
884 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
885 return 1;
886 return 0;
887}
888
889int
890valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
891{
892 unsigned long phys_addr = pfn << PAGE_SHIFT;
893 u64 attr;
894
895 attr = efi_mem_attribute(phys_addr, size);
896
897 /*
898 * /dev/mem mmap uses normal user pages, so we don't need the entire
899 * granule, but the entire region we're mapping must support the same
900 * attribute.
901 */
902 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
903 return 1;
904
905 /*
906 * Intel firmware doesn't tell us about all the MMIO regions, so
907 * in general we have to allow mmap requests. But if EFI *does*
908 * tell us about anything inside this region, we should deny it.
909 * The user can always map a smaller region to avoid the overlap.
910 */
911 if (efi_memmap_intersects(phys_addr, size))
912 return 0;
913
914 return 1;
915}
916
917pgprot_t
918phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
919 pgprot_t vma_prot)
920{
921 unsigned long phys_addr = pfn << PAGE_SHIFT;
922 u64 attr;
923
924 /*
925 * For /dev/mem mmap, we use user mappings, but if the region is
926 * in kern_memmap (and hence may be covered by a kernel mapping),
927 * we must use the same attribute as the kernel mapping.
928 */
929 attr = kern_mem_attribute(phys_addr, size);
930 if (attr & EFI_MEMORY_WB)
931 return pgprot_cacheable(vma_prot);
932 else if (attr & EFI_MEMORY_UC)
933 return pgprot_noncached(vma_prot);
934
935 /*
936 * Some chipsets don't support UC access to memory. If
937 * WB is supported, we prefer that.
938 */
939 if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
940 return pgprot_cacheable(vma_prot);
941
942 return pgprot_noncached(vma_prot);
943}
944
945int __init
946efi_uart_console_only(void)
947{
948 efi_status_t status;
949 char *s, name[] = "ConOut";
950 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
951 efi_char16_t *utf16, name_utf16[32];
952 unsigned char data[1024];
953 unsigned long size = sizeof(data);
954 struct efi_generic_dev_path *hdr, *end_addr;
955 int uart = 0;
956
957 /* Convert to UTF-16 */
958 utf16 = name_utf16;
959 s = name;
960 while (*s)
961 *utf16++ = *s++ & 0x7f;
962 *utf16 = 0;
963
964 status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
965 if (status != EFI_SUCCESS) {
966 printk(KERN_ERR "No EFI %s variable?\n", name);
967 return 0;
968 }
969
970 hdr = (struct efi_generic_dev_path *) data;
971 end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
972 while (hdr < end_addr) {
973 if (hdr->type == EFI_DEV_MSG &&
974 hdr->sub_type == EFI_DEV_MSG_UART)
975 uart = 1;
976 else if (hdr->type == EFI_DEV_END_PATH ||
977 hdr->type == EFI_DEV_END_PATH2) {
978 if (!uart)
979 return 0;
980 if (hdr->sub_type == EFI_DEV_END_ENTIRE)
981 return 1;
982 uart = 0;
983 }
984 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
985 }
986 printk(KERN_ERR "Malformed %s value\n", name);
987 return 0;
988}
989
990/*
991 * Look for the first granule aligned memory descriptor memory
992 * that is big enough to hold EFI memory map. Make sure this
993 * descriptor is atleast granule sized so it does not get trimmed
994 */
995struct kern_memdesc *
996find_memmap_space (void)
997{
998 u64 contig_low=0, contig_high=0;
999 u64 as = 0, ae;
1000 void *efi_map_start, *efi_map_end, *p, *q;
1001 efi_memory_desc_t *md, *pmd = NULL, *check_md;
1002 u64 space_needed, efi_desc_size;
1003 unsigned long total_mem = 0;
1004
1005 efi_map_start = __va(ia64_boot_param->efi_memmap);
1006 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1007 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1008
1009 /*
1010 * Worst case: we need 3 kernel descriptors for each efi descriptor
1011 * (if every entry has a WB part in the middle, and UC head and tail),
1012 * plus one for the end marker.
1013 */
1014 space_needed = sizeof(kern_memdesc_t) *
1015 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
1016
1017 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1018 md = p;
1019 if (!efi_wb(md)) {
1020 continue;
1021 }
1022 if (pmd == NULL || !efi_wb(pmd) ||
1023 efi_md_end(pmd) != md->phys_addr) {
1024 contig_low = GRANULEROUNDUP(md->phys_addr);
1025 contig_high = efi_md_end(md);
1026 for (q = p + efi_desc_size; q < efi_map_end;
1027 q += efi_desc_size) {
1028 check_md = q;
1029 if (!efi_wb(check_md))
1030 break;
1031 if (contig_high != check_md->phys_addr)
1032 break;
1033 contig_high = efi_md_end(check_md);
1034 }
1035 contig_high = GRANULEROUNDDOWN(contig_high);
1036 }
1037 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1038 continue;
1039
1040 /* Round ends inward to granule boundaries */
1041 as = max(contig_low, md->phys_addr);
1042 ae = min(contig_high, efi_md_end(md));
1043
1044 /* keep within max_addr= and min_addr= command line arg */
1045 as = max(as, min_addr);
1046 ae = min(ae, max_addr);
1047 if (ae <= as)
1048 continue;
1049
1050 /* avoid going over mem= command line arg */
1051 if (total_mem + (ae - as) > mem_limit)
1052 ae -= total_mem + (ae - as) - mem_limit;
1053
1054 if (ae <= as)
1055 continue;
1056
1057 if (ae - as > space_needed)
1058 break;
1059 }
1060 if (p >= efi_map_end)
1061 panic("Can't allocate space for kernel memory descriptors");
1062
1063 return __va(as);
1064}
1065
1066/*
1067 * Walk the EFI memory map and gather all memory available for kernel
1068 * to use. We can allocate partial granules only if the unavailable
1069 * parts exist, and are WB.
1070 */
1071unsigned long
1072efi_memmap_init(u64 *s, u64 *e)
1073{
1074 struct kern_memdesc *k, *prev = NULL;
1075 u64 contig_low=0, contig_high=0;
1076 u64 as, ae, lim;
1077 void *efi_map_start, *efi_map_end, *p, *q;
1078 efi_memory_desc_t *md, *pmd = NULL, *check_md;
1079 u64 efi_desc_size;
1080 unsigned long total_mem = 0;
1081
1082 k = kern_memmap = find_memmap_space();
1083
1084 efi_map_start = __va(ia64_boot_param->efi_memmap);
1085 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1086 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1087
1088 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1089 md = p;
1090 if (!efi_wb(md)) {
1091 if (efi_uc(md) &&
1092 (md->type == EFI_CONVENTIONAL_MEMORY ||
1093 md->type == EFI_BOOT_SERVICES_DATA)) {
1094 k->attribute = EFI_MEMORY_UC;
1095 k->start = md->phys_addr;
1096 k->num_pages = md->num_pages;
1097 k++;
1098 }
1099 continue;
1100 }
1101 if (pmd == NULL || !efi_wb(pmd) ||
1102 efi_md_end(pmd) != md->phys_addr) {
1103 contig_low = GRANULEROUNDUP(md->phys_addr);
1104 contig_high = efi_md_end(md);
1105 for (q = p + efi_desc_size; q < efi_map_end;
1106 q += efi_desc_size) {
1107 check_md = q;
1108 if (!efi_wb(check_md))
1109 break;
1110 if (contig_high != check_md->phys_addr)
1111 break;
1112 contig_high = efi_md_end(check_md);
1113 }
1114 contig_high = GRANULEROUNDDOWN(contig_high);
1115 }
1116 if (!is_memory_available(md))
1117 continue;
1118
1119#ifdef CONFIG_CRASH_DUMP
1120 /* saved_max_pfn should ignore max_addr= command line arg */
1121 if (saved_max_pfn < (efi_md_end(md) >> PAGE_SHIFT))
1122 saved_max_pfn = (efi_md_end(md) >> PAGE_SHIFT);
1123#endif
1124 /*
1125 * Round ends inward to granule boundaries
1126 * Give trimmings to uncached allocator
1127 */
1128 if (md->phys_addr < contig_low) {
1129 lim = min(efi_md_end(md), contig_low);
1130 if (efi_uc(md)) {
1131 if (k > kern_memmap &&
1132 (k-1)->attribute == EFI_MEMORY_UC &&
1133 kmd_end(k-1) == md->phys_addr) {
1134 (k-1)->num_pages +=
1135 (lim - md->phys_addr)
1136 >> EFI_PAGE_SHIFT;
1137 } else {
1138 k->attribute = EFI_MEMORY_UC;
1139 k->start = md->phys_addr;
1140 k->num_pages = (lim - md->phys_addr)
1141 >> EFI_PAGE_SHIFT;
1142 k++;
1143 }
1144 }
1145 as = contig_low;
1146 } else
1147 as = md->phys_addr;
1148
1149 if (efi_md_end(md) > contig_high) {
1150 lim = max(md->phys_addr, contig_high);
1151 if (efi_uc(md)) {
1152 if (lim == md->phys_addr && k > kern_memmap &&
1153 (k-1)->attribute == EFI_MEMORY_UC &&
1154 kmd_end(k-1) == md->phys_addr) {
1155 (k-1)->num_pages += md->num_pages;
1156 } else {
1157 k->attribute = EFI_MEMORY_UC;
1158 k->start = lim;
1159 k->num_pages = (efi_md_end(md) - lim)
1160 >> EFI_PAGE_SHIFT;
1161 k++;
1162 }
1163 }
1164 ae = contig_high;
1165 } else
1166 ae = efi_md_end(md);
1167
1168 /* keep within max_addr= and min_addr= command line arg */
1169 as = max(as, min_addr);
1170 ae = min(ae, max_addr);
1171 if (ae <= as)
1172 continue;
1173
1174 /* avoid going over mem= command line arg */
1175 if (total_mem + (ae - as) > mem_limit)
1176 ae -= total_mem + (ae - as) - mem_limit;
1177
1178 if (ae <= as)
1179 continue;
1180 if (prev && kmd_end(prev) == md->phys_addr) {
1181 prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1182 total_mem += ae - as;
1183 continue;
1184 }
1185 k->attribute = EFI_MEMORY_WB;
1186 k->start = as;
1187 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1188 total_mem += ae - as;
1189 prev = k++;
1190 }
1191 k->start = ~0L; /* end-marker */
1192
1193 /* reserve the memory we are using for kern_memmap */
1194 *s = (u64)kern_memmap;
1195 *e = (u64)++k;
1196
1197 return total_mem;
1198}
1199
1200void
1201efi_initialize_iomem_resources(struct resource *code_resource,
1202 struct resource *data_resource,
1203 struct resource *bss_resource)
1204{
1205 struct resource *res;
1206 void *efi_map_start, *efi_map_end, *p;
1207 efi_memory_desc_t *md;
1208 u64 efi_desc_size;
1209 char *name;
1210 unsigned long flags;
1211
1212 efi_map_start = __va(ia64_boot_param->efi_memmap);
1213 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1214 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1215
1216 res = NULL;
1217
1218 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1219 md = p;
1220
1221 if (md->num_pages == 0) /* should not happen */
1222 continue;
1223
1224 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1225 switch (md->type) {
1226
1227 case EFI_MEMORY_MAPPED_IO:
1228 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1229 continue;
1230
1231 case EFI_LOADER_CODE:
1232 case EFI_LOADER_DATA:
1233 case EFI_BOOT_SERVICES_DATA:
1234 case EFI_BOOT_SERVICES_CODE:
1235 case EFI_CONVENTIONAL_MEMORY:
1236 if (md->attribute & EFI_MEMORY_WP) {
1237 name = "System ROM";
1238 flags |= IORESOURCE_READONLY;
1239 } else if (md->attribute == EFI_MEMORY_UC)
1240 name = "Uncached RAM";
1241 else
1242 name = "System RAM";
1243 break;
1244
1245 case EFI_ACPI_MEMORY_NVS:
1246 name = "ACPI Non-volatile Storage";
1247 break;
1248
1249 case EFI_UNUSABLE_MEMORY:
1250 name = "reserved";
1251 flags |= IORESOURCE_DISABLED;
1252 break;
1253
1254 case EFI_RESERVED_TYPE:
1255 case EFI_RUNTIME_SERVICES_CODE:
1256 case EFI_RUNTIME_SERVICES_DATA:
1257 case EFI_ACPI_RECLAIM_MEMORY:
1258 default:
1259 name = "reserved";
1260 break;
1261 }
1262
1263 if ((res = kzalloc(sizeof(struct resource),
1264 GFP_KERNEL)) == NULL) {
1265 printk(KERN_ERR
1266 "failed to allocate resource for iomem\n");
1267 return;
1268 }
1269
1270 res->name = name;
1271 res->start = md->phys_addr;
1272 res->end = md->phys_addr + efi_md_size(md) - 1;
1273 res->flags = flags;
1274
1275 if (insert_resource(&iomem_resource, res) < 0)
1276 kfree(res);
1277 else {
1278 /*
1279 * We don't know which region contains
1280 * kernel data so we try it repeatedly and
1281 * let the resource manager test it.
1282 */
1283 insert_resource(res, code_resource);
1284 insert_resource(res, data_resource);
1285 insert_resource(res, bss_resource);
1286#ifdef CONFIG_KEXEC
1287 insert_resource(res, &efi_memmap_res);
1288 insert_resource(res, &boot_param_res);
1289 if (crashk_res.end > crashk_res.start)
1290 insert_resource(res, &crashk_res);
1291#endif
1292 }
1293 }
1294}
1295
1296#ifdef CONFIG_KEXEC
1297/* find a block of memory aligned to 64M exclude reserved regions
1298 rsvd_regions are sorted
1299 */
1300unsigned long __init
1301kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1302{
1303 int i;
1304 u64 start, end;
1305 u64 alignment = 1UL << _PAGE_SIZE_64M;
1306 void *efi_map_start, *efi_map_end, *p;
1307 efi_memory_desc_t *md;
1308 u64 efi_desc_size;
1309
1310 efi_map_start = __va(ia64_boot_param->efi_memmap);
1311 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1312 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1313
1314 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1315 md = p;
1316 if (!efi_wb(md))
1317 continue;
1318 start = ALIGN(md->phys_addr, alignment);
1319 end = efi_md_end(md);
1320 for (i = 0; i < n; i++) {
1321 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1322 if (__pa(r[i].start) > start + size)
1323 return start;
1324 start = ALIGN(__pa(r[i].end), alignment);
1325 if (i < n-1 &&
1326 __pa(r[i+1].start) < start + size)
1327 continue;
1328 else
1329 break;
1330 }
1331 }
1332 if (end > start + size)
1333 return start;
1334 }
1335
1336 printk(KERN_WARNING
1337 "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1338 return ~0UL;
1339}
1340#endif
1341
1342#ifdef CONFIG_CRASH_DUMP
1343/* locate the size find a the descriptor at a certain address */
1344unsigned long __init
1345vmcore_find_descriptor_size (unsigned long address)
1346{
1347 void *efi_map_start, *efi_map_end, *p;
1348 efi_memory_desc_t *md;
1349 u64 efi_desc_size;
1350 unsigned long ret = 0;
1351
1352 efi_map_start = __va(ia64_boot_param->efi_memmap);
1353 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1354 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1355
1356 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1357 md = p;
1358 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1359 && md->phys_addr == address) {
1360 ret = efi_md_size(md);
1361 break;
1362 }
1363 }
1364
1365 if (ret == 0)
1366 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1367
1368 return ret;
1369}
1370#endif