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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/processor.h>
41#include <asm/mca.h>
42#include <asm/setup.h>
43#include <asm/tlbflush.h>
44
45#define EFI_DEBUG 0
46
47#define ESI_TABLE_GUID \
48 EFI_GUID(0x43EA58DC, 0xCF28, 0x4b06, 0xB3, \
49 0x91, 0xB7, 0x50, 0x59, 0x34, 0x2B, 0xD4)
50
51static unsigned long mps_phys = EFI_INVALID_TABLE_ADDR;
52static __initdata unsigned long palo_phys;
53
54unsigned long __initdata esi_phys = EFI_INVALID_TABLE_ADDR;
55unsigned long hcdp_phys = EFI_INVALID_TABLE_ADDR;
56unsigned long sal_systab_phys = EFI_INVALID_TABLE_ADDR;
57
58static const efi_config_table_type_t arch_tables[] __initconst = {
59 {ESI_TABLE_GUID, &esi_phys, "ESI" },
60 {HCDP_TABLE_GUID, &hcdp_phys, "HCDP" },
61 {MPS_TABLE_GUID, &mps_phys, "MPS" },
62 {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, &palo_phys, "PALO" },
63 {SAL_SYSTEM_TABLE_GUID, &sal_systab_phys, "SALsystab" },
64 {},
65};
66
67extern efi_status_t efi_call_phys (void *, ...);
68
69static efi_runtime_services_t *runtime;
70static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
71
72#define efi_call_virt(f, args...) (*(f))(args)
73
74#define STUB_GET_TIME(prefix, adjust_arg) \
75static efi_status_t \
76prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \
77{ \
78 struct ia64_fpreg fr[6]; \
79 efi_time_cap_t *atc = NULL; \
80 efi_status_t ret; \
81 \
82 if (tc) \
83 atc = adjust_arg(tc); \
84 ia64_save_scratch_fpregs(fr); \
85 ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), \
86 adjust_arg(tm), atc); \
87 ia64_load_scratch_fpregs(fr); \
88 return ret; \
89}
90
91#define STUB_SET_TIME(prefix, adjust_arg) \
92static efi_status_t \
93prefix##_set_time (efi_time_t *tm) \
94{ \
95 struct ia64_fpreg fr[6]; \
96 efi_status_t ret; \
97 \
98 ia64_save_scratch_fpregs(fr); \
99 ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), \
100 adjust_arg(tm)); \
101 ia64_load_scratch_fpregs(fr); \
102 return ret; \
103}
104
105#define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \
106static efi_status_t \
107prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, \
108 efi_time_t *tm) \
109{ \
110 struct ia64_fpreg fr[6]; \
111 efi_status_t ret; \
112 \
113 ia64_save_scratch_fpregs(fr); \
114 ret = efi_call_##prefix( \
115 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time), \
116 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm)); \
117 ia64_load_scratch_fpregs(fr); \
118 return ret; \
119}
120
121#define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \
122static efi_status_t \
123prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \
124{ \
125 struct ia64_fpreg fr[6]; \
126 efi_time_t *atm = NULL; \
127 efi_status_t ret; \
128 \
129 if (tm) \
130 atm = adjust_arg(tm); \
131 ia64_save_scratch_fpregs(fr); \
132 ret = efi_call_##prefix( \
133 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time), \
134 enabled, atm); \
135 ia64_load_scratch_fpregs(fr); \
136 return ret; \
137}
138
139#define STUB_GET_VARIABLE(prefix, adjust_arg) \
140static efi_status_t \
141prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \
142 unsigned long *data_size, void *data) \
143{ \
144 struct ia64_fpreg fr[6]; \
145 u32 *aattr = NULL; \
146 efi_status_t ret; \
147 \
148 if (attr) \
149 aattr = adjust_arg(attr); \
150 ia64_save_scratch_fpregs(fr); \
151 ret = efi_call_##prefix( \
152 (efi_get_variable_t *) __va(runtime->get_variable), \
153 adjust_arg(name), adjust_arg(vendor), aattr, \
154 adjust_arg(data_size), adjust_arg(data)); \
155 ia64_load_scratch_fpregs(fr); \
156 return ret; \
157}
158
159#define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \
160static efi_status_t \
161prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, \
162 efi_guid_t *vendor) \
163{ \
164 struct ia64_fpreg fr[6]; \
165 efi_status_t ret; \
166 \
167 ia64_save_scratch_fpregs(fr); \
168 ret = efi_call_##prefix( \
169 (efi_get_next_variable_t *) __va(runtime->get_next_variable), \
170 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor)); \
171 ia64_load_scratch_fpregs(fr); \
172 return ret; \
173}
174
175#define STUB_SET_VARIABLE(prefix, adjust_arg) \
176static efi_status_t \
177prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, \
178 u32 attr, unsigned long data_size, \
179 void *data) \
180{ \
181 struct ia64_fpreg fr[6]; \
182 efi_status_t ret; \
183 \
184 ia64_save_scratch_fpregs(fr); \
185 ret = efi_call_##prefix( \
186 (efi_set_variable_t *) __va(runtime->set_variable), \
187 adjust_arg(name), adjust_arg(vendor), attr, data_size, \
188 adjust_arg(data)); \
189 ia64_load_scratch_fpregs(fr); \
190 return ret; \
191}
192
193#define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \
194static efi_status_t \
195prefix##_get_next_high_mono_count (u32 *count) \
196{ \
197 struct ia64_fpreg fr[6]; \
198 efi_status_t ret; \
199 \
200 ia64_save_scratch_fpregs(fr); \
201 ret = efi_call_##prefix((efi_get_next_high_mono_count_t *) \
202 __va(runtime->get_next_high_mono_count), \
203 adjust_arg(count)); \
204 ia64_load_scratch_fpregs(fr); \
205 return ret; \
206}
207
208#define STUB_RESET_SYSTEM(prefix, adjust_arg) \
209static void \
210prefix##_reset_system (int reset_type, efi_status_t status, \
211 unsigned long data_size, efi_char16_t *data) \
212{ \
213 struct ia64_fpreg fr[6]; \
214 efi_char16_t *adata = NULL; \
215 \
216 if (data) \
217 adata = adjust_arg(data); \
218 \
219 ia64_save_scratch_fpregs(fr); \
220 efi_call_##prefix( \
221 (efi_reset_system_t *) __va(runtime->reset_system), \
222 reset_type, status, data_size, adata); \
223 /* should not return, but just in case... */ \
224 ia64_load_scratch_fpregs(fr); \
225}
226
227#define phys_ptr(arg) ((__typeof__(arg)) ia64_tpa(arg))
228
229STUB_GET_TIME(phys, phys_ptr)
230STUB_SET_TIME(phys, phys_ptr)
231STUB_GET_WAKEUP_TIME(phys, phys_ptr)
232STUB_SET_WAKEUP_TIME(phys, phys_ptr)
233STUB_GET_VARIABLE(phys, phys_ptr)
234STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
235STUB_SET_VARIABLE(phys, phys_ptr)
236STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
237STUB_RESET_SYSTEM(phys, phys_ptr)
238
239#define id(arg) arg
240
241STUB_GET_TIME(virt, id)
242STUB_SET_TIME(virt, id)
243STUB_GET_WAKEUP_TIME(virt, id)
244STUB_SET_WAKEUP_TIME(virt, id)
245STUB_GET_VARIABLE(virt, id)
246STUB_GET_NEXT_VARIABLE(virt, id)
247STUB_SET_VARIABLE(virt, id)
248STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
249STUB_RESET_SYSTEM(virt, id)
250
251void
252efi_gettimeofday (struct timespec64 *ts)
253{
254 efi_time_t tm;
255
256 if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
257 memset(ts, 0, sizeof(*ts));
258 return;
259 }
260
261 ts->tv_sec = mktime64(tm.year, tm.month, tm.day,
262 tm.hour, tm.minute, tm.second);
263 ts->tv_nsec = tm.nanosecond;
264}
265
266static int
267is_memory_available (efi_memory_desc_t *md)
268{
269 if (!(md->attribute & EFI_MEMORY_WB))
270 return 0;
271
272 switch (md->type) {
273 case EFI_LOADER_CODE:
274 case EFI_LOADER_DATA:
275 case EFI_BOOT_SERVICES_CODE:
276 case EFI_BOOT_SERVICES_DATA:
277 case EFI_CONVENTIONAL_MEMORY:
278 return 1;
279 }
280 return 0;
281}
282
283typedef struct kern_memdesc {
284 u64 attribute;
285 u64 start;
286 u64 num_pages;
287} kern_memdesc_t;
288
289static kern_memdesc_t *kern_memmap;
290
291#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
292
293static inline u64
294kmd_end(kern_memdesc_t *kmd)
295{
296 return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
297}
298
299static inline u64
300efi_md_end(efi_memory_desc_t *md)
301{
302 return (md->phys_addr + efi_md_size(md));
303}
304
305static inline int
306efi_wb(efi_memory_desc_t *md)
307{
308 return (md->attribute & EFI_MEMORY_WB);
309}
310
311static inline int
312efi_uc(efi_memory_desc_t *md)
313{
314 return (md->attribute & EFI_MEMORY_UC);
315}
316
317static void
318walk (efi_freemem_callback_t callback, void *arg, u64 attr)
319{
320 kern_memdesc_t *k;
321 u64 start, end, voff;
322
323 voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
324 for (k = kern_memmap; k->start != ~0UL; k++) {
325 if (k->attribute != attr)
326 continue;
327 start = PAGE_ALIGN(k->start);
328 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
329 if (start < end)
330 if ((*callback)(start + voff, end + voff, arg) < 0)
331 return;
332 }
333}
334
335/*
336 * Walk the EFI memory map and call CALLBACK once for each EFI memory
337 * descriptor that has memory that is available for OS use.
338 */
339void
340efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
341{
342 walk(callback, arg, EFI_MEMORY_WB);
343}
344
345/*
346 * Walk the EFI memory map and call CALLBACK once for each EFI memory
347 * descriptor that has memory that is available for uncached allocator.
348 */
349void
350efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
351{
352 walk(callback, arg, EFI_MEMORY_UC);
353}
354
355/*
356 * Look for the PAL_CODE region reported by EFI and map it using an
357 * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor
358 * Abstraction Layer chapter 11 in ADAG
359 */
360void *
361efi_get_pal_addr (void)
362{
363 void *efi_map_start, *efi_map_end, *p;
364 efi_memory_desc_t *md;
365 u64 efi_desc_size;
366 int pal_code_count = 0;
367 u64 vaddr, mask;
368
369 efi_map_start = __va(ia64_boot_param->efi_memmap);
370 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
371 efi_desc_size = ia64_boot_param->efi_memdesc_size;
372
373 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
374 md = p;
375 if (md->type != EFI_PAL_CODE)
376 continue;
377
378 if (++pal_code_count > 1) {
379 printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
380 "dropped @ %llx\n", md->phys_addr);
381 continue;
382 }
383 /*
384 * The only ITLB entry in region 7 that is used is the one
385 * installed by __start(). That entry covers a 64MB range.
386 */
387 mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
388 vaddr = PAGE_OFFSET + md->phys_addr;
389
390 /*
391 * We must check that the PAL mapping won't overlap with the
392 * kernel mapping.
393 *
394 * PAL code is guaranteed to be aligned on a power of 2 between
395 * 4k and 256KB and that only one ITR is needed to map it. This
396 * implies that the PAL code is always aligned on its size,
397 * i.e., the closest matching page size supported by the TLB.
398 * Therefore PAL code is guaranteed never to cross a 64MB unless
399 * it is bigger than 64MB (very unlikely!). So for now the
400 * following test is enough to determine whether or not we need
401 * a dedicated ITR for the PAL code.
402 */
403 if ((vaddr & mask) == (KERNEL_START & mask)) {
404 printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
405 __func__);
406 continue;
407 }
408
409 if (efi_md_size(md) > IA64_GRANULE_SIZE)
410 panic("Whoa! PAL code size bigger than a granule!");
411
412#if EFI_DEBUG
413 mask = ~((1 << IA64_GRANULE_SHIFT) - 1);
414
415 printk(KERN_INFO "CPU %d: mapping PAL code "
416 "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
417 smp_processor_id(), md->phys_addr,
418 md->phys_addr + efi_md_size(md),
419 vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
420#endif
421 return __va(md->phys_addr);
422 }
423 printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
424 __func__);
425 return NULL;
426}
427
428
429static u8 __init palo_checksum(u8 *buffer, u32 length)
430{
431 u8 sum = 0;
432 u8 *end = buffer + length;
433
434 while (buffer < end)
435 sum = (u8) (sum + *(buffer++));
436
437 return sum;
438}
439
440/*
441 * Parse and handle PALO table which is published at:
442 * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
443 */
444static void __init handle_palo(unsigned long phys_addr)
445{
446 struct palo_table *palo = __va(phys_addr);
447 u8 checksum;
448
449 if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
450 printk(KERN_INFO "PALO signature incorrect.\n");
451 return;
452 }
453
454 checksum = palo_checksum((u8 *)palo, palo->length);
455 if (checksum) {
456 printk(KERN_INFO "PALO checksum incorrect.\n");
457 return;
458 }
459
460 setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
461}
462
463void
464efi_map_pal_code (void)
465{
466 void *pal_vaddr = efi_get_pal_addr ();
467 u64 psr;
468
469 if (!pal_vaddr)
470 return;
471
472 /*
473 * Cannot write to CRx with PSR.ic=1
474 */
475 psr = ia64_clear_ic();
476 ia64_itr(0x1, IA64_TR_PALCODE,
477 GRANULEROUNDDOWN((unsigned long) pal_vaddr),
478 pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
479 IA64_GRANULE_SHIFT);
480 ia64_set_psr(psr); /* restore psr */
481}
482
483void __init
484efi_init (void)
485{
486 const efi_system_table_t *efi_systab;
487 void *efi_map_start, *efi_map_end;
488 u64 efi_desc_size;
489 char *cp;
490
491 set_bit(EFI_BOOT, &efi.flags);
492 set_bit(EFI_64BIT, &efi.flags);
493
494 /*
495 * It's too early to be able to use the standard kernel command line
496 * support...
497 */
498 for (cp = boot_command_line; *cp; ) {
499 if (memcmp(cp, "mem=", 4) == 0) {
500 mem_limit = memparse(cp + 4, &cp);
501 } else if (memcmp(cp, "max_addr=", 9) == 0) {
502 max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
503 } else if (memcmp(cp, "min_addr=", 9) == 0) {
504 min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
505 } else {
506 while (*cp != ' ' && *cp)
507 ++cp;
508 while (*cp == ' ')
509 ++cp;
510 }
511 }
512 if (min_addr != 0UL)
513 printk(KERN_INFO "Ignoring memory below %lluMB\n",
514 min_addr >> 20);
515 if (max_addr != ~0UL)
516 printk(KERN_INFO "Ignoring memory above %lluMB\n",
517 max_addr >> 20);
518
519 efi_systab = __va(ia64_boot_param->efi_systab);
520
521 /*
522 * Verify the EFI Table
523 */
524 if (efi_systab == NULL)
525 panic("Whoa! Can't find EFI system table.\n");
526 if (efi_systab_check_header(&efi_systab->hdr, 1))
527 panic("Whoa! EFI system table signature incorrect\n");
528
529 efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor);
530
531 palo_phys = EFI_INVALID_TABLE_ADDR;
532
533 if (efi_config_parse_tables(__va(efi_systab->tables),
534 efi_systab->nr_tables,
535 arch_tables) != 0)
536 return;
537
538 if (palo_phys != EFI_INVALID_TABLE_ADDR)
539 handle_palo(palo_phys);
540
541 runtime = __va(efi_systab->runtime);
542 efi.get_time = phys_get_time;
543 efi.set_time = phys_set_time;
544 efi.get_wakeup_time = phys_get_wakeup_time;
545 efi.set_wakeup_time = phys_set_wakeup_time;
546 efi.get_variable = phys_get_variable;
547 efi.get_next_variable = phys_get_next_variable;
548 efi.set_variable = phys_set_variable;
549 efi.get_next_high_mono_count = phys_get_next_high_mono_count;
550 efi.reset_system = phys_reset_system;
551
552 efi_map_start = __va(ia64_boot_param->efi_memmap);
553 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
554 efi_desc_size = ia64_boot_param->efi_memdesc_size;
555
556#if EFI_DEBUG
557 /* print EFI memory map: */
558 {
559 efi_memory_desc_t *md;
560 void *p;
561
562 for (i = 0, p = efi_map_start; p < efi_map_end;
563 ++i, p += efi_desc_size)
564 {
565 const char *unit;
566 unsigned long size;
567 char buf[64];
568
569 md = p;
570 size = md->num_pages << EFI_PAGE_SHIFT;
571
572 if ((size >> 40) > 0) {
573 size >>= 40;
574 unit = "TB";
575 } else if ((size >> 30) > 0) {
576 size >>= 30;
577 unit = "GB";
578 } else if ((size >> 20) > 0) {
579 size >>= 20;
580 unit = "MB";
581 } else {
582 size >>= 10;
583 unit = "KB";
584 }
585
586 printk("mem%02d: %s "
587 "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
588 i, efi_md_typeattr_format(buf, sizeof(buf), md),
589 md->phys_addr,
590 md->phys_addr + efi_md_size(md), size, unit);
591 }
592 }
593#endif
594
595 efi_map_pal_code();
596 efi_enter_virtual_mode();
597}
598
599void
600efi_enter_virtual_mode (void)
601{
602 void *efi_map_start, *efi_map_end, *p;
603 efi_memory_desc_t *md;
604 efi_status_t status;
605 u64 efi_desc_size;
606
607 efi_map_start = __va(ia64_boot_param->efi_memmap);
608 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
609 efi_desc_size = ia64_boot_param->efi_memdesc_size;
610
611 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
612 md = p;
613 if (md->attribute & EFI_MEMORY_RUNTIME) {
614 /*
615 * Some descriptors have multiple bits set, so the
616 * order of the tests is relevant.
617 */
618 if (md->attribute & EFI_MEMORY_WB) {
619 md->virt_addr = (u64) __va(md->phys_addr);
620 } else if (md->attribute & EFI_MEMORY_UC) {
621 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
622 } else if (md->attribute & EFI_MEMORY_WC) {
623#if 0
624 md->virt_addr = ia64_remap(md->phys_addr,
625 (_PAGE_A |
626 _PAGE_P |
627 _PAGE_D |
628 _PAGE_MA_WC |
629 _PAGE_PL_0 |
630 _PAGE_AR_RW));
631#else
632 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
633 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
634#endif
635 } else if (md->attribute & EFI_MEMORY_WT) {
636#if 0
637 md->virt_addr = ia64_remap(md->phys_addr,
638 (_PAGE_A |
639 _PAGE_P |
640 _PAGE_D |
641 _PAGE_MA_WT |
642 _PAGE_PL_0 |
643 _PAGE_AR_RW));
644#else
645 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
646 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
647#endif
648 }
649 }
650 }
651
652 status = efi_call_phys(__va(runtime->set_virtual_address_map),
653 ia64_boot_param->efi_memmap_size,
654 efi_desc_size,
655 ia64_boot_param->efi_memdesc_version,
656 ia64_boot_param->efi_memmap);
657 if (status != EFI_SUCCESS) {
658 printk(KERN_WARNING "warning: unable to switch EFI into "
659 "virtual mode (status=%lu)\n", status);
660 return;
661 }
662
663 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
664
665 /*
666 * Now that EFI is in virtual mode, we call the EFI functions more
667 * efficiently:
668 */
669 efi.get_time = virt_get_time;
670 efi.set_time = virt_set_time;
671 efi.get_wakeup_time = virt_get_wakeup_time;
672 efi.set_wakeup_time = virt_set_wakeup_time;
673 efi.get_variable = virt_get_variable;
674 efi.get_next_variable = virt_get_next_variable;
675 efi.set_variable = virt_set_variable;
676 efi.get_next_high_mono_count = virt_get_next_high_mono_count;
677 efi.reset_system = virt_reset_system;
678}
679
680/*
681 * Walk the EFI memory map looking for the I/O port range. There can only be
682 * one entry of this type, other I/O port ranges should be described via ACPI.
683 */
684u64
685efi_get_iobase (void)
686{
687 void *efi_map_start, *efi_map_end, *p;
688 efi_memory_desc_t *md;
689 u64 efi_desc_size;
690
691 efi_map_start = __va(ia64_boot_param->efi_memmap);
692 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
693 efi_desc_size = ia64_boot_param->efi_memdesc_size;
694
695 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
696 md = p;
697 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
698 if (md->attribute & EFI_MEMORY_UC)
699 return md->phys_addr;
700 }
701 }
702 return 0;
703}
704
705static struct kern_memdesc *
706kern_memory_descriptor (unsigned long phys_addr)
707{
708 struct kern_memdesc *md;
709
710 for (md = kern_memmap; md->start != ~0UL; md++) {
711 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
712 return md;
713 }
714 return NULL;
715}
716
717static efi_memory_desc_t *
718efi_memory_descriptor (unsigned long phys_addr)
719{
720 void *efi_map_start, *efi_map_end, *p;
721 efi_memory_desc_t *md;
722 u64 efi_desc_size;
723
724 efi_map_start = __va(ia64_boot_param->efi_memmap);
725 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
726 efi_desc_size = ia64_boot_param->efi_memdesc_size;
727
728 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
729 md = p;
730
731 if (phys_addr - md->phys_addr < efi_md_size(md))
732 return md;
733 }
734 return NULL;
735}
736
737static int
738efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
739{
740 void *efi_map_start, *efi_map_end, *p;
741 efi_memory_desc_t *md;
742 u64 efi_desc_size;
743 unsigned long end;
744
745 efi_map_start = __va(ia64_boot_param->efi_memmap);
746 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
747 efi_desc_size = ia64_boot_param->efi_memdesc_size;
748
749 end = phys_addr + size;
750
751 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
752 md = p;
753 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
754 return 1;
755 }
756 return 0;
757}
758
759int
760efi_mem_type (unsigned long phys_addr)
761{
762 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
763
764 if (md)
765 return md->type;
766 return -EINVAL;
767}
768
769u64
770efi_mem_attributes (unsigned long phys_addr)
771{
772 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
773
774 if (md)
775 return md->attribute;
776 return 0;
777}
778EXPORT_SYMBOL(efi_mem_attributes);
779
780u64
781efi_mem_attribute (unsigned long phys_addr, unsigned long size)
782{
783 unsigned long end = phys_addr + size;
784 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
785 u64 attr;
786
787 if (!md)
788 return 0;
789
790 /*
791 * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
792 * the kernel that firmware needs this region mapped.
793 */
794 attr = md->attribute & ~EFI_MEMORY_RUNTIME;
795 do {
796 unsigned long md_end = efi_md_end(md);
797
798 if (end <= md_end)
799 return attr;
800
801 md = efi_memory_descriptor(md_end);
802 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
803 return 0;
804 } while (md);
805 return 0; /* never reached */
806}
807
808u64
809kern_mem_attribute (unsigned long phys_addr, unsigned long size)
810{
811 unsigned long end = phys_addr + size;
812 struct kern_memdesc *md;
813 u64 attr;
814
815 /*
816 * This is a hack for ioremap calls before we set up kern_memmap.
817 * Maybe we should do efi_memmap_init() earlier instead.
818 */
819 if (!kern_memmap) {
820 attr = efi_mem_attribute(phys_addr, size);
821 if (attr & EFI_MEMORY_WB)
822 return EFI_MEMORY_WB;
823 return 0;
824 }
825
826 md = kern_memory_descriptor(phys_addr);
827 if (!md)
828 return 0;
829
830 attr = md->attribute;
831 do {
832 unsigned long md_end = kmd_end(md);
833
834 if (end <= md_end)
835 return attr;
836
837 md = kern_memory_descriptor(md_end);
838 if (!md || md->attribute != attr)
839 return 0;
840 } while (md);
841 return 0; /* never reached */
842}
843
844int
845valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
846{
847 u64 attr;
848
849 /*
850 * /dev/mem reads and writes use copy_to_user(), which implicitly
851 * uses a granule-sized kernel identity mapping. It's really
852 * only safe to do this for regions in kern_memmap. For more
853 * details, see Documentation/ia64/aliasing.rst.
854 */
855 attr = kern_mem_attribute(phys_addr, size);
856 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
857 return 1;
858 return 0;
859}
860
861int
862valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
863{
864 unsigned long phys_addr = pfn << PAGE_SHIFT;
865 u64 attr;
866
867 attr = efi_mem_attribute(phys_addr, size);
868
869 /*
870 * /dev/mem mmap uses normal user pages, so we don't need the entire
871 * granule, but the entire region we're mapping must support the same
872 * attribute.
873 */
874 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
875 return 1;
876
877 /*
878 * Intel firmware doesn't tell us about all the MMIO regions, so
879 * in general we have to allow mmap requests. But if EFI *does*
880 * tell us about anything inside this region, we should deny it.
881 * The user can always map a smaller region to avoid the overlap.
882 */
883 if (efi_memmap_intersects(phys_addr, size))
884 return 0;
885
886 return 1;
887}
888
889pgprot_t
890phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
891 pgprot_t vma_prot)
892{
893 unsigned long phys_addr = pfn << PAGE_SHIFT;
894 u64 attr;
895
896 /*
897 * For /dev/mem mmap, we use user mappings, but if the region is
898 * in kern_memmap (and hence may be covered by a kernel mapping),
899 * we must use the same attribute as the kernel mapping.
900 */
901 attr = kern_mem_attribute(phys_addr, size);
902 if (attr & EFI_MEMORY_WB)
903 return pgprot_cacheable(vma_prot);
904 else if (attr & EFI_MEMORY_UC)
905 return pgprot_noncached(vma_prot);
906
907 /*
908 * Some chipsets don't support UC access to memory. If
909 * WB is supported, we prefer that.
910 */
911 if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
912 return pgprot_cacheable(vma_prot);
913
914 return pgprot_noncached(vma_prot);
915}
916
917int __init
918efi_uart_console_only(void)
919{
920 efi_status_t status;
921 char *s, name[] = "ConOut";
922 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
923 efi_char16_t *utf16, name_utf16[32];
924 unsigned char data[1024];
925 unsigned long size = sizeof(data);
926 struct efi_generic_dev_path *hdr, *end_addr;
927 int uart = 0;
928
929 /* Convert to UTF-16 */
930 utf16 = name_utf16;
931 s = name;
932 while (*s)
933 *utf16++ = *s++ & 0x7f;
934 *utf16 = 0;
935
936 status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
937 if (status != EFI_SUCCESS) {
938 printk(KERN_ERR "No EFI %s variable?\n", name);
939 return 0;
940 }
941
942 hdr = (struct efi_generic_dev_path *) data;
943 end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
944 while (hdr < end_addr) {
945 if (hdr->type == EFI_DEV_MSG &&
946 hdr->sub_type == EFI_DEV_MSG_UART)
947 uart = 1;
948 else if (hdr->type == EFI_DEV_END_PATH ||
949 hdr->type == EFI_DEV_END_PATH2) {
950 if (!uart)
951 return 0;
952 if (hdr->sub_type == EFI_DEV_END_ENTIRE)
953 return 1;
954 uart = 0;
955 }
956 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
957 }
958 printk(KERN_ERR "Malformed %s value\n", name);
959 return 0;
960}
961
962/*
963 * Look for the first granule aligned memory descriptor memory
964 * that is big enough to hold EFI memory map. Make sure this
965 * descriptor is at least granule sized so it does not get trimmed
966 */
967struct kern_memdesc *
968find_memmap_space (void)
969{
970 u64 contig_low=0, contig_high=0;
971 u64 as = 0, ae;
972 void *efi_map_start, *efi_map_end, *p, *q;
973 efi_memory_desc_t *md, *pmd = NULL, *check_md;
974 u64 space_needed, efi_desc_size;
975 unsigned long total_mem = 0;
976
977 efi_map_start = __va(ia64_boot_param->efi_memmap);
978 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
979 efi_desc_size = ia64_boot_param->efi_memdesc_size;
980
981 /*
982 * Worst case: we need 3 kernel descriptors for each efi descriptor
983 * (if every entry has a WB part in the middle, and UC head and tail),
984 * plus one for the end marker.
985 */
986 space_needed = sizeof(kern_memdesc_t) *
987 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
988
989 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
990 md = p;
991 if (!efi_wb(md)) {
992 continue;
993 }
994 if (pmd == NULL || !efi_wb(pmd) ||
995 efi_md_end(pmd) != md->phys_addr) {
996 contig_low = GRANULEROUNDUP(md->phys_addr);
997 contig_high = efi_md_end(md);
998 for (q = p + efi_desc_size; q < efi_map_end;
999 q += efi_desc_size) {
1000 check_md = q;
1001 if (!efi_wb(check_md))
1002 break;
1003 if (contig_high != check_md->phys_addr)
1004 break;
1005 contig_high = efi_md_end(check_md);
1006 }
1007 contig_high = GRANULEROUNDDOWN(contig_high);
1008 }
1009 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1010 continue;
1011
1012 /* Round ends inward to granule boundaries */
1013 as = max(contig_low, md->phys_addr);
1014 ae = min(contig_high, efi_md_end(md));
1015
1016 /* keep within max_addr= and min_addr= command line arg */
1017 as = max(as, min_addr);
1018 ae = min(ae, max_addr);
1019 if (ae <= as)
1020 continue;
1021
1022 /* avoid going over mem= command line arg */
1023 if (total_mem + (ae - as) > mem_limit)
1024 ae -= total_mem + (ae - as) - mem_limit;
1025
1026 if (ae <= as)
1027 continue;
1028
1029 if (ae - as > space_needed)
1030 break;
1031 }
1032 if (p >= efi_map_end)
1033 panic("Can't allocate space for kernel memory descriptors");
1034
1035 return __va(as);
1036}
1037
1038/*
1039 * Walk the EFI memory map and gather all memory available for kernel
1040 * to use. We can allocate partial granules only if the unavailable
1041 * parts exist, and are WB.
1042 */
1043unsigned long
1044efi_memmap_init(u64 *s, u64 *e)
1045{
1046 struct kern_memdesc *k, *prev = NULL;
1047 u64 contig_low=0, contig_high=0;
1048 u64 as, ae, lim;
1049 void *efi_map_start, *efi_map_end, *p, *q;
1050 efi_memory_desc_t *md, *pmd = NULL, *check_md;
1051 u64 efi_desc_size;
1052 unsigned long total_mem = 0;
1053
1054 k = kern_memmap = find_memmap_space();
1055
1056 efi_map_start = __va(ia64_boot_param->efi_memmap);
1057 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1058 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1059
1060 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1061 md = p;
1062 if (!efi_wb(md)) {
1063 if (efi_uc(md) &&
1064 (md->type == EFI_CONVENTIONAL_MEMORY ||
1065 md->type == EFI_BOOT_SERVICES_DATA)) {
1066 k->attribute = EFI_MEMORY_UC;
1067 k->start = md->phys_addr;
1068 k->num_pages = md->num_pages;
1069 k++;
1070 }
1071 continue;
1072 }
1073 if (pmd == NULL || !efi_wb(pmd) ||
1074 efi_md_end(pmd) != md->phys_addr) {
1075 contig_low = GRANULEROUNDUP(md->phys_addr);
1076 contig_high = efi_md_end(md);
1077 for (q = p + efi_desc_size; q < efi_map_end;
1078 q += efi_desc_size) {
1079 check_md = q;
1080 if (!efi_wb(check_md))
1081 break;
1082 if (contig_high != check_md->phys_addr)
1083 break;
1084 contig_high = efi_md_end(check_md);
1085 }
1086 contig_high = GRANULEROUNDDOWN(contig_high);
1087 }
1088 if (!is_memory_available(md))
1089 continue;
1090
1091 /*
1092 * Round ends inward to granule boundaries
1093 * Give trimmings to uncached allocator
1094 */
1095 if (md->phys_addr < contig_low) {
1096 lim = min(efi_md_end(md), contig_low);
1097 if (efi_uc(md)) {
1098 if (k > kern_memmap &&
1099 (k-1)->attribute == EFI_MEMORY_UC &&
1100 kmd_end(k-1) == md->phys_addr) {
1101 (k-1)->num_pages +=
1102 (lim - md->phys_addr)
1103 >> EFI_PAGE_SHIFT;
1104 } else {
1105 k->attribute = EFI_MEMORY_UC;
1106 k->start = md->phys_addr;
1107 k->num_pages = (lim - md->phys_addr)
1108 >> EFI_PAGE_SHIFT;
1109 k++;
1110 }
1111 }
1112 as = contig_low;
1113 } else
1114 as = md->phys_addr;
1115
1116 if (efi_md_end(md) > contig_high) {
1117 lim = max(md->phys_addr, contig_high);
1118 if (efi_uc(md)) {
1119 if (lim == md->phys_addr && k > kern_memmap &&
1120 (k-1)->attribute == EFI_MEMORY_UC &&
1121 kmd_end(k-1) == md->phys_addr) {
1122 (k-1)->num_pages += md->num_pages;
1123 } else {
1124 k->attribute = EFI_MEMORY_UC;
1125 k->start = lim;
1126 k->num_pages = (efi_md_end(md) - lim)
1127 >> EFI_PAGE_SHIFT;
1128 k++;
1129 }
1130 }
1131 ae = contig_high;
1132 } else
1133 ae = efi_md_end(md);
1134
1135 /* keep within max_addr= and min_addr= command line arg */
1136 as = max(as, min_addr);
1137 ae = min(ae, max_addr);
1138 if (ae <= as)
1139 continue;
1140
1141 /* avoid going over mem= command line arg */
1142 if (total_mem + (ae - as) > mem_limit)
1143 ae -= total_mem + (ae - as) - mem_limit;
1144
1145 if (ae <= as)
1146 continue;
1147 if (prev && kmd_end(prev) == md->phys_addr) {
1148 prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1149 total_mem += ae - as;
1150 continue;
1151 }
1152 k->attribute = EFI_MEMORY_WB;
1153 k->start = as;
1154 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1155 total_mem += ae - as;
1156 prev = k++;
1157 }
1158 k->start = ~0L; /* end-marker */
1159
1160 /* reserve the memory we are using for kern_memmap */
1161 *s = (u64)kern_memmap;
1162 *e = (u64)++k;
1163
1164 return total_mem;
1165}
1166
1167void
1168efi_initialize_iomem_resources(struct resource *code_resource,
1169 struct resource *data_resource,
1170 struct resource *bss_resource)
1171{
1172 struct resource *res;
1173 void *efi_map_start, *efi_map_end, *p;
1174 efi_memory_desc_t *md;
1175 u64 efi_desc_size;
1176 char *name;
1177 unsigned long flags, desc;
1178
1179 efi_map_start = __va(ia64_boot_param->efi_memmap);
1180 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1181 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1182
1183 res = NULL;
1184
1185 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1186 md = p;
1187
1188 if (md->num_pages == 0) /* should not happen */
1189 continue;
1190
1191 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1192 desc = IORES_DESC_NONE;
1193
1194 switch (md->type) {
1195
1196 case EFI_MEMORY_MAPPED_IO:
1197 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1198 continue;
1199
1200 case EFI_LOADER_CODE:
1201 case EFI_LOADER_DATA:
1202 case EFI_BOOT_SERVICES_DATA:
1203 case EFI_BOOT_SERVICES_CODE:
1204 case EFI_CONVENTIONAL_MEMORY:
1205 if (md->attribute & EFI_MEMORY_WP) {
1206 name = "System ROM";
1207 flags |= IORESOURCE_READONLY;
1208 } else if (md->attribute == EFI_MEMORY_UC) {
1209 name = "Uncached RAM";
1210 } else {
1211 name = "System RAM";
1212 flags |= IORESOURCE_SYSRAM;
1213 }
1214 break;
1215
1216 case EFI_ACPI_MEMORY_NVS:
1217 name = "ACPI Non-volatile Storage";
1218 desc = IORES_DESC_ACPI_NV_STORAGE;
1219 break;
1220
1221 case EFI_UNUSABLE_MEMORY:
1222 name = "reserved";
1223 flags |= IORESOURCE_DISABLED;
1224 break;
1225
1226 case EFI_PERSISTENT_MEMORY:
1227 name = "Persistent Memory";
1228 desc = IORES_DESC_PERSISTENT_MEMORY;
1229 break;
1230
1231 case EFI_RESERVED_TYPE:
1232 case EFI_RUNTIME_SERVICES_CODE:
1233 case EFI_RUNTIME_SERVICES_DATA:
1234 case EFI_ACPI_RECLAIM_MEMORY:
1235 default:
1236 name = "reserved";
1237 break;
1238 }
1239
1240 if ((res = kzalloc(sizeof(struct resource),
1241 GFP_KERNEL)) == NULL) {
1242 printk(KERN_ERR
1243 "failed to allocate resource for iomem\n");
1244 return;
1245 }
1246
1247 res->name = name;
1248 res->start = md->phys_addr;
1249 res->end = md->phys_addr + efi_md_size(md) - 1;
1250 res->flags = flags;
1251 res->desc = desc;
1252
1253 if (insert_resource(&iomem_resource, res) < 0)
1254 kfree(res);
1255 else {
1256 /*
1257 * We don't know which region contains
1258 * kernel data so we try it repeatedly and
1259 * let the resource manager test it.
1260 */
1261 insert_resource(res, code_resource);
1262 insert_resource(res, data_resource);
1263 insert_resource(res, bss_resource);
1264#ifdef CONFIG_KEXEC
1265 insert_resource(res, &efi_memmap_res);
1266 insert_resource(res, &boot_param_res);
1267 if (crashk_res.end > crashk_res.start)
1268 insert_resource(res, &crashk_res);
1269#endif
1270 }
1271 }
1272}
1273
1274#ifdef CONFIG_KEXEC
1275/* find a block of memory aligned to 64M exclude reserved regions
1276 rsvd_regions are sorted
1277 */
1278unsigned long __init
1279kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1280{
1281 int i;
1282 u64 start, end;
1283 u64 alignment = 1UL << _PAGE_SIZE_64M;
1284 void *efi_map_start, *efi_map_end, *p;
1285 efi_memory_desc_t *md;
1286 u64 efi_desc_size;
1287
1288 efi_map_start = __va(ia64_boot_param->efi_memmap);
1289 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1290 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1291
1292 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1293 md = p;
1294 if (!efi_wb(md))
1295 continue;
1296 start = ALIGN(md->phys_addr, alignment);
1297 end = efi_md_end(md);
1298 for (i = 0; i < n; i++) {
1299 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1300 if (__pa(r[i].start) > start + size)
1301 return start;
1302 start = ALIGN(__pa(r[i].end), alignment);
1303 if (i < n-1 &&
1304 __pa(r[i+1].start) < start + size)
1305 continue;
1306 else
1307 break;
1308 }
1309 }
1310 if (end > start + size)
1311 return start;
1312 }
1313
1314 printk(KERN_WARNING
1315 "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1316 return ~0UL;
1317}
1318#endif
1319
1320#ifdef CONFIG_CRASH_DUMP
1321/* locate the size find a the descriptor at a certain address */
1322unsigned long __init
1323vmcore_find_descriptor_size (unsigned long address)
1324{
1325 void *efi_map_start, *efi_map_end, *p;
1326 efi_memory_desc_t *md;
1327 u64 efi_desc_size;
1328 unsigned long ret = 0;
1329
1330 efi_map_start = __va(ia64_boot_param->efi_memmap);
1331 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1332 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1333
1334 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1335 md = p;
1336 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1337 && md->phys_addr == address) {
1338 ret = efi_md_size(md);
1339 break;
1340 }
1341 }
1342
1343 if (ret == 0)
1344 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1345
1346 return ret;
1347}
1348#endif
1349
1350char *efi_systab_show_arch(char *str)
1351{
1352 if (mps_phys != EFI_INVALID_TABLE_ADDR)
1353 str += sprintf(str, "MPS=0x%lx\n", mps_phys);
1354 if (hcdp_phys != EFI_INVALID_TABLE_ADDR)
1355 str += sprintf(str, "HCDP=0x%lx\n", hcdp_phys);
1356 return str;
1357}
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/bootmem.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
50static __initdata efi_config_table_type_t arch_tables[] = {
51 {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, "PALO", &palo_phys},
52 {NULL_GUID, NULL, 0},
53};
54
55extern efi_status_t efi_call_phys (void *, ...);
56
57static efi_runtime_services_t *runtime;
58static 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) \
63static efi_status_t \
64prefix##_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) \
80static efi_status_t \
81prefix##_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) \
94static efi_status_t \
95prefix##_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) \
110static efi_status_t \
111prefix##_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) \
128static efi_status_t \
129prefix##_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) \
148static efi_status_t \
149prefix##_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) \
164static efi_status_t \
165prefix##_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) \
182static efi_status_t \
183prefix##_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) \
197static void \
198prefix##_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
217STUB_GET_TIME(phys, phys_ptr)
218STUB_SET_TIME(phys, phys_ptr)
219STUB_GET_WAKEUP_TIME(phys, phys_ptr)
220STUB_SET_WAKEUP_TIME(phys, phys_ptr)
221STUB_GET_VARIABLE(phys, phys_ptr)
222STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
223STUB_SET_VARIABLE(phys, phys_ptr)
224STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
225STUB_RESET_SYSTEM(phys, phys_ptr)
226
227#define id(arg) arg
228
229STUB_GET_TIME(virt, id)
230STUB_SET_TIME(virt, id)
231STUB_GET_WAKEUP_TIME(virt, id)
232STUB_SET_WAKEUP_TIME(virt, id)
233STUB_GET_VARIABLE(virt, id)
234STUB_GET_NEXT_VARIABLE(virt, id)
235STUB_SET_VARIABLE(virt, id)
236STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
237STUB_RESET_SYSTEM(virt, id)
238
239void
240efi_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
254static int
255is_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
271typedef struct kern_memdesc {
272 u64 attribute;
273 u64 start;
274 u64 num_pages;
275} kern_memdesc_t;
276
277static kern_memdesc_t *kern_memmap;
278
279#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
280
281static inline u64
282kmd_end(kern_memdesc_t *kmd)
283{
284 return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
285}
286
287static inline u64
288efi_md_end(efi_memory_desc_t *md)
289{
290 return (md->phys_addr + efi_md_size(md));
291}
292
293static inline int
294efi_wb(efi_memory_desc_t *md)
295{
296 return (md->attribute & EFI_MEMORY_WB);
297}
298
299static inline int
300efi_uc(efi_memory_desc_t *md)
301{
302 return (md->attribute & EFI_MEMORY_UC);
303}
304
305static void
306walk (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 */
327void
328efi_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 */
337void
338efi_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 */
348void *
349efi_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
417static 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 */
432static 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
451void
452efi_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
471void __init
472efi_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
601void
602efi_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 */
686u64
687efi_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
707static struct kern_memdesc *
708kern_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
719static efi_memory_desc_t *
720efi_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
739static int
740efi_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
761int
762efi_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
771u64
772efi_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}
780EXPORT_SYMBOL(efi_mem_attributes);
781
782u64
783efi_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
810u64
811kern_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}
845EXPORT_SYMBOL(kern_mem_attribute);
846
847int
848valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
849{
850 u64 attr;
851
852 /*
853 * /dev/mem reads and writes use copy_to_user(), which implicitly
854 * uses a granule-sized kernel identity mapping. It's really
855 * only safe to do this for regions in kern_memmap. For more
856 * details, see Documentation/ia64/aliasing.txt.
857 */
858 attr = kern_mem_attribute(phys_addr, size);
859 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
860 return 1;
861 return 0;
862}
863
864int
865valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
866{
867 unsigned long phys_addr = pfn << PAGE_SHIFT;
868 u64 attr;
869
870 attr = efi_mem_attribute(phys_addr, size);
871
872 /*
873 * /dev/mem mmap uses normal user pages, so we don't need the entire
874 * granule, but the entire region we're mapping must support the same
875 * attribute.
876 */
877 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
878 return 1;
879
880 /*
881 * Intel firmware doesn't tell us about all the MMIO regions, so
882 * in general we have to allow mmap requests. But if EFI *does*
883 * tell us about anything inside this region, we should deny it.
884 * The user can always map a smaller region to avoid the overlap.
885 */
886 if (efi_memmap_intersects(phys_addr, size))
887 return 0;
888
889 return 1;
890}
891
892pgprot_t
893phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
894 pgprot_t vma_prot)
895{
896 unsigned long phys_addr = pfn << PAGE_SHIFT;
897 u64 attr;
898
899 /*
900 * For /dev/mem mmap, we use user mappings, but if the region is
901 * in kern_memmap (and hence may be covered by a kernel mapping),
902 * we must use the same attribute as the kernel mapping.
903 */
904 attr = kern_mem_attribute(phys_addr, size);
905 if (attr & EFI_MEMORY_WB)
906 return pgprot_cacheable(vma_prot);
907 else if (attr & EFI_MEMORY_UC)
908 return pgprot_noncached(vma_prot);
909
910 /*
911 * Some chipsets don't support UC access to memory. If
912 * WB is supported, we prefer that.
913 */
914 if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
915 return pgprot_cacheable(vma_prot);
916
917 return pgprot_noncached(vma_prot);
918}
919
920int __init
921efi_uart_console_only(void)
922{
923 efi_status_t status;
924 char *s, name[] = "ConOut";
925 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
926 efi_char16_t *utf16, name_utf16[32];
927 unsigned char data[1024];
928 unsigned long size = sizeof(data);
929 struct efi_generic_dev_path *hdr, *end_addr;
930 int uart = 0;
931
932 /* Convert to UTF-16 */
933 utf16 = name_utf16;
934 s = name;
935 while (*s)
936 *utf16++ = *s++ & 0x7f;
937 *utf16 = 0;
938
939 status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
940 if (status != EFI_SUCCESS) {
941 printk(KERN_ERR "No EFI %s variable?\n", name);
942 return 0;
943 }
944
945 hdr = (struct efi_generic_dev_path *) data;
946 end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
947 while (hdr < end_addr) {
948 if (hdr->type == EFI_DEV_MSG &&
949 hdr->sub_type == EFI_DEV_MSG_UART)
950 uart = 1;
951 else if (hdr->type == EFI_DEV_END_PATH ||
952 hdr->type == EFI_DEV_END_PATH2) {
953 if (!uart)
954 return 0;
955 if (hdr->sub_type == EFI_DEV_END_ENTIRE)
956 return 1;
957 uart = 0;
958 }
959 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
960 }
961 printk(KERN_ERR "Malformed %s value\n", name);
962 return 0;
963}
964
965/*
966 * Look for the first granule aligned memory descriptor memory
967 * that is big enough to hold EFI memory map. Make sure this
968 * descriptor is at least granule sized so it does not get trimmed
969 */
970struct kern_memdesc *
971find_memmap_space (void)
972{
973 u64 contig_low=0, contig_high=0;
974 u64 as = 0, ae;
975 void *efi_map_start, *efi_map_end, *p, *q;
976 efi_memory_desc_t *md, *pmd = NULL, *check_md;
977 u64 space_needed, efi_desc_size;
978 unsigned long total_mem = 0;
979
980 efi_map_start = __va(ia64_boot_param->efi_memmap);
981 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
982 efi_desc_size = ia64_boot_param->efi_memdesc_size;
983
984 /*
985 * Worst case: we need 3 kernel descriptors for each efi descriptor
986 * (if every entry has a WB part in the middle, and UC head and tail),
987 * plus one for the end marker.
988 */
989 space_needed = sizeof(kern_memdesc_t) *
990 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
991
992 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
993 md = p;
994 if (!efi_wb(md)) {
995 continue;
996 }
997 if (pmd == NULL || !efi_wb(pmd) ||
998 efi_md_end(pmd) != md->phys_addr) {
999 contig_low = GRANULEROUNDUP(md->phys_addr);
1000 contig_high = efi_md_end(md);
1001 for (q = p + efi_desc_size; q < efi_map_end;
1002 q += efi_desc_size) {
1003 check_md = q;
1004 if (!efi_wb(check_md))
1005 break;
1006 if (contig_high != check_md->phys_addr)
1007 break;
1008 contig_high = efi_md_end(check_md);
1009 }
1010 contig_high = GRANULEROUNDDOWN(contig_high);
1011 }
1012 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1013 continue;
1014
1015 /* Round ends inward to granule boundaries */
1016 as = max(contig_low, md->phys_addr);
1017 ae = min(contig_high, efi_md_end(md));
1018
1019 /* keep within max_addr= and min_addr= command line arg */
1020 as = max(as, min_addr);
1021 ae = min(ae, max_addr);
1022 if (ae <= as)
1023 continue;
1024
1025 /* avoid going over mem= command line arg */
1026 if (total_mem + (ae - as) > mem_limit)
1027 ae -= total_mem + (ae - as) - mem_limit;
1028
1029 if (ae <= as)
1030 continue;
1031
1032 if (ae - as > space_needed)
1033 break;
1034 }
1035 if (p >= efi_map_end)
1036 panic("Can't allocate space for kernel memory descriptors");
1037
1038 return __va(as);
1039}
1040
1041/*
1042 * Walk the EFI memory map and gather all memory available for kernel
1043 * to use. We can allocate partial granules only if the unavailable
1044 * parts exist, and are WB.
1045 */
1046unsigned long
1047efi_memmap_init(u64 *s, u64 *e)
1048{
1049 struct kern_memdesc *k, *prev = NULL;
1050 u64 contig_low=0, contig_high=0;
1051 u64 as, ae, lim;
1052 void *efi_map_start, *efi_map_end, *p, *q;
1053 efi_memory_desc_t *md, *pmd = NULL, *check_md;
1054 u64 efi_desc_size;
1055 unsigned long total_mem = 0;
1056
1057 k = kern_memmap = find_memmap_space();
1058
1059 efi_map_start = __va(ia64_boot_param->efi_memmap);
1060 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1061 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1062
1063 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1064 md = p;
1065 if (!efi_wb(md)) {
1066 if (efi_uc(md) &&
1067 (md->type == EFI_CONVENTIONAL_MEMORY ||
1068 md->type == EFI_BOOT_SERVICES_DATA)) {
1069 k->attribute = EFI_MEMORY_UC;
1070 k->start = md->phys_addr;
1071 k->num_pages = md->num_pages;
1072 k++;
1073 }
1074 continue;
1075 }
1076 if (pmd == NULL || !efi_wb(pmd) ||
1077 efi_md_end(pmd) != md->phys_addr) {
1078 contig_low = GRANULEROUNDUP(md->phys_addr);
1079 contig_high = efi_md_end(md);
1080 for (q = p + efi_desc_size; q < efi_map_end;
1081 q += efi_desc_size) {
1082 check_md = q;
1083 if (!efi_wb(check_md))
1084 break;
1085 if (contig_high != check_md->phys_addr)
1086 break;
1087 contig_high = efi_md_end(check_md);
1088 }
1089 contig_high = GRANULEROUNDDOWN(contig_high);
1090 }
1091 if (!is_memory_available(md))
1092 continue;
1093
1094 /*
1095 * Round ends inward to granule boundaries
1096 * Give trimmings to uncached allocator
1097 */
1098 if (md->phys_addr < contig_low) {
1099 lim = min(efi_md_end(md), contig_low);
1100 if (efi_uc(md)) {
1101 if (k > kern_memmap &&
1102 (k-1)->attribute == EFI_MEMORY_UC &&
1103 kmd_end(k-1) == md->phys_addr) {
1104 (k-1)->num_pages +=
1105 (lim - md->phys_addr)
1106 >> EFI_PAGE_SHIFT;
1107 } else {
1108 k->attribute = EFI_MEMORY_UC;
1109 k->start = md->phys_addr;
1110 k->num_pages = (lim - md->phys_addr)
1111 >> EFI_PAGE_SHIFT;
1112 k++;
1113 }
1114 }
1115 as = contig_low;
1116 } else
1117 as = md->phys_addr;
1118
1119 if (efi_md_end(md) > contig_high) {
1120 lim = max(md->phys_addr, contig_high);
1121 if (efi_uc(md)) {
1122 if (lim == md->phys_addr && k > kern_memmap &&
1123 (k-1)->attribute == EFI_MEMORY_UC &&
1124 kmd_end(k-1) == md->phys_addr) {
1125 (k-1)->num_pages += md->num_pages;
1126 } else {
1127 k->attribute = EFI_MEMORY_UC;
1128 k->start = lim;
1129 k->num_pages = (efi_md_end(md) - lim)
1130 >> EFI_PAGE_SHIFT;
1131 k++;
1132 }
1133 }
1134 ae = contig_high;
1135 } else
1136 ae = efi_md_end(md);
1137
1138 /* keep within max_addr= and min_addr= command line arg */
1139 as = max(as, min_addr);
1140 ae = min(ae, max_addr);
1141 if (ae <= as)
1142 continue;
1143
1144 /* avoid going over mem= command line arg */
1145 if (total_mem + (ae - as) > mem_limit)
1146 ae -= total_mem + (ae - as) - mem_limit;
1147
1148 if (ae <= as)
1149 continue;
1150 if (prev && kmd_end(prev) == md->phys_addr) {
1151 prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1152 total_mem += ae - as;
1153 continue;
1154 }
1155 k->attribute = EFI_MEMORY_WB;
1156 k->start = as;
1157 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1158 total_mem += ae - as;
1159 prev = k++;
1160 }
1161 k->start = ~0L; /* end-marker */
1162
1163 /* reserve the memory we are using for kern_memmap */
1164 *s = (u64)kern_memmap;
1165 *e = (u64)++k;
1166
1167 return total_mem;
1168}
1169
1170void
1171efi_initialize_iomem_resources(struct resource *code_resource,
1172 struct resource *data_resource,
1173 struct resource *bss_resource)
1174{
1175 struct resource *res;
1176 void *efi_map_start, *efi_map_end, *p;
1177 efi_memory_desc_t *md;
1178 u64 efi_desc_size;
1179 char *name;
1180 unsigned long flags, desc;
1181
1182 efi_map_start = __va(ia64_boot_param->efi_memmap);
1183 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1184 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1185
1186 res = NULL;
1187
1188 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1189 md = p;
1190
1191 if (md->num_pages == 0) /* should not happen */
1192 continue;
1193
1194 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1195 desc = IORES_DESC_NONE;
1196
1197 switch (md->type) {
1198
1199 case EFI_MEMORY_MAPPED_IO:
1200 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1201 continue;
1202
1203 case EFI_LOADER_CODE:
1204 case EFI_LOADER_DATA:
1205 case EFI_BOOT_SERVICES_DATA:
1206 case EFI_BOOT_SERVICES_CODE:
1207 case EFI_CONVENTIONAL_MEMORY:
1208 if (md->attribute & EFI_MEMORY_WP) {
1209 name = "System ROM";
1210 flags |= IORESOURCE_READONLY;
1211 } else if (md->attribute == EFI_MEMORY_UC) {
1212 name = "Uncached RAM";
1213 } else {
1214 name = "System RAM";
1215 flags |= IORESOURCE_SYSRAM;
1216 }
1217 break;
1218
1219 case EFI_ACPI_MEMORY_NVS:
1220 name = "ACPI Non-volatile Storage";
1221 desc = IORES_DESC_ACPI_NV_STORAGE;
1222 break;
1223
1224 case EFI_UNUSABLE_MEMORY:
1225 name = "reserved";
1226 flags |= IORESOURCE_DISABLED;
1227 break;
1228
1229 case EFI_PERSISTENT_MEMORY:
1230 name = "Persistent Memory";
1231 desc = IORES_DESC_PERSISTENT_MEMORY;
1232 break;
1233
1234 case EFI_RESERVED_TYPE:
1235 case EFI_RUNTIME_SERVICES_CODE:
1236 case EFI_RUNTIME_SERVICES_DATA:
1237 case EFI_ACPI_RECLAIM_MEMORY:
1238 default:
1239 name = "reserved";
1240 break;
1241 }
1242
1243 if ((res = kzalloc(sizeof(struct resource),
1244 GFP_KERNEL)) == NULL) {
1245 printk(KERN_ERR
1246 "failed to allocate resource for iomem\n");
1247 return;
1248 }
1249
1250 res->name = name;
1251 res->start = md->phys_addr;
1252 res->end = md->phys_addr + efi_md_size(md) - 1;
1253 res->flags = flags;
1254 res->desc = desc;
1255
1256 if (insert_resource(&iomem_resource, res) < 0)
1257 kfree(res);
1258 else {
1259 /*
1260 * We don't know which region contains
1261 * kernel data so we try it repeatedly and
1262 * let the resource manager test it.
1263 */
1264 insert_resource(res, code_resource);
1265 insert_resource(res, data_resource);
1266 insert_resource(res, bss_resource);
1267#ifdef CONFIG_KEXEC
1268 insert_resource(res, &efi_memmap_res);
1269 insert_resource(res, &boot_param_res);
1270 if (crashk_res.end > crashk_res.start)
1271 insert_resource(res, &crashk_res);
1272#endif
1273 }
1274 }
1275}
1276
1277#ifdef CONFIG_KEXEC
1278/* find a block of memory aligned to 64M exclude reserved regions
1279 rsvd_regions are sorted
1280 */
1281unsigned long __init
1282kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1283{
1284 int i;
1285 u64 start, end;
1286 u64 alignment = 1UL << _PAGE_SIZE_64M;
1287 void *efi_map_start, *efi_map_end, *p;
1288 efi_memory_desc_t *md;
1289 u64 efi_desc_size;
1290
1291 efi_map_start = __va(ia64_boot_param->efi_memmap);
1292 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1293 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1294
1295 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1296 md = p;
1297 if (!efi_wb(md))
1298 continue;
1299 start = ALIGN(md->phys_addr, alignment);
1300 end = efi_md_end(md);
1301 for (i = 0; i < n; i++) {
1302 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1303 if (__pa(r[i].start) > start + size)
1304 return start;
1305 start = ALIGN(__pa(r[i].end), alignment);
1306 if (i < n-1 &&
1307 __pa(r[i+1].start) < start + size)
1308 continue;
1309 else
1310 break;
1311 }
1312 }
1313 if (end > start + size)
1314 return start;
1315 }
1316
1317 printk(KERN_WARNING
1318 "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1319 return ~0UL;
1320}
1321#endif
1322
1323#ifdef CONFIG_CRASH_DUMP
1324/* locate the size find a the descriptor at a certain address */
1325unsigned long __init
1326vmcore_find_descriptor_size (unsigned long address)
1327{
1328 void *efi_map_start, *efi_map_end, *p;
1329 efi_memory_desc_t *md;
1330 u64 efi_desc_size;
1331 unsigned long ret = 0;
1332
1333 efi_map_start = __va(ia64_boot_param->efi_memmap);
1334 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1335 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1336
1337 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1338 md = p;
1339 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1340 && md->phys_addr == address) {
1341 ret = efi_md_size(md);
1342 break;
1343 }
1344 }
1345
1346 if (ret == 0)
1347 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1348
1349 return ret;
1350}
1351#endif