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1/*
2 * Extensible Firmware Interface
3 *
4 * Based on Extensible Firmware Interface Specification version 0.9 April 30, 1999
5 *
6 * Copyright (C) 1999 VA Linux Systems
7 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
8 * Copyright (C) 1999-2003 Hewlett-Packard Co.
9 * David Mosberger-Tang <davidm@hpl.hp.com>
10 * Stephane Eranian <eranian@hpl.hp.com>
11 *
12 * All EFI Runtime Services are not implemented yet as EFI only
13 * supports physical mode addressing on SoftSDV. This is to be fixed
14 * in a future version. --drummond 1999-07-20
15 *
16 * Implemented EFI runtime services and virtual mode calls. --davidm
17 *
18 * Goutham Rao: <goutham.rao@intel.com>
19 * Skip non-WB memory and ignore empty memory ranges.
20 */
21#include <linux/config.h>
22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/init.h>
25#include <linux/types.h>
26#include <linux/time.h>
27#include <linux/efi.h>
28
29#include <asm/io.h>
30#include <asm/kregs.h>
31#include <asm/meminit.h>
32#include <asm/pgtable.h>
33#include <asm/processor.h>
34#include <asm/mca.h>
35
36#define EFI_DEBUG 0
37
38extern efi_status_t efi_call_phys (void *, ...);
39
40struct efi efi;
41EXPORT_SYMBOL(efi);
42static efi_runtime_services_t *runtime;
43static unsigned long mem_limit = ~0UL, max_addr = ~0UL;
44
45#define efi_call_virt(f, args...) (*(f))(args)
46
47#define STUB_GET_TIME(prefix, adjust_arg) \
48static efi_status_t \
49prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \
50{ \
51 struct ia64_fpreg fr[6]; \
52 efi_time_cap_t *atc = NULL; \
53 efi_status_t ret; \
54 \
55 if (tc) \
56 atc = adjust_arg(tc); \
57 ia64_save_scratch_fpregs(fr); \
58 ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm), atc); \
59 ia64_load_scratch_fpregs(fr); \
60 return ret; \
61}
62
63#define STUB_SET_TIME(prefix, adjust_arg) \
64static efi_status_t \
65prefix##_set_time (efi_time_t *tm) \
66{ \
67 struct ia64_fpreg fr[6]; \
68 efi_status_t ret; \
69 \
70 ia64_save_scratch_fpregs(fr); \
71 ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), adjust_arg(tm)); \
72 ia64_load_scratch_fpregs(fr); \
73 return ret; \
74}
75
76#define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \
77static efi_status_t \
78prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm) \
79{ \
80 struct ia64_fpreg fr[6]; \
81 efi_status_t ret; \
82 \
83 ia64_save_scratch_fpregs(fr); \
84 ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time), \
85 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm)); \
86 ia64_load_scratch_fpregs(fr); \
87 return ret; \
88}
89
90#define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \
91static efi_status_t \
92prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \
93{ \
94 struct ia64_fpreg fr[6]; \
95 efi_time_t *atm = NULL; \
96 efi_status_t ret; \
97 \
98 if (tm) \
99 atm = adjust_arg(tm); \
100 ia64_save_scratch_fpregs(fr); \
101 ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time), \
102 enabled, atm); \
103 ia64_load_scratch_fpregs(fr); \
104 return ret; \
105}
106
107#define STUB_GET_VARIABLE(prefix, adjust_arg) \
108static efi_status_t \
109prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \
110 unsigned long *data_size, void *data) \
111{ \
112 struct ia64_fpreg fr[6]; \
113 u32 *aattr = NULL; \
114 efi_status_t ret; \
115 \
116 if (attr) \
117 aattr = adjust_arg(attr); \
118 ia64_save_scratch_fpregs(fr); \
119 ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable), \
120 adjust_arg(name), adjust_arg(vendor), aattr, \
121 adjust_arg(data_size), adjust_arg(data)); \
122 ia64_load_scratch_fpregs(fr); \
123 return ret; \
124}
125
126#define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \
127static efi_status_t \
128prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor) \
129{ \
130 struct ia64_fpreg fr[6]; \
131 efi_status_t ret; \
132 \
133 ia64_save_scratch_fpregs(fr); \
134 ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable), \
135 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor)); \
136 ia64_load_scratch_fpregs(fr); \
137 return ret; \
138}
139
140#define STUB_SET_VARIABLE(prefix, adjust_arg) \
141static efi_status_t \
142prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, unsigned long attr, \
143 unsigned long data_size, void *data) \
144{ \
145 struct ia64_fpreg fr[6]; \
146 efi_status_t ret; \
147 \
148 ia64_save_scratch_fpregs(fr); \
149 ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable), \
150 adjust_arg(name), adjust_arg(vendor), attr, data_size, \
151 adjust_arg(data)); \
152 ia64_load_scratch_fpregs(fr); \
153 return ret; \
154}
155
156#define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \
157static efi_status_t \
158prefix##_get_next_high_mono_count (u32 *count) \
159{ \
160 struct ia64_fpreg fr[6]; \
161 efi_status_t ret; \
162 \
163 ia64_save_scratch_fpregs(fr); \
164 ret = efi_call_##prefix((efi_get_next_high_mono_count_t *) \
165 __va(runtime->get_next_high_mono_count), adjust_arg(count)); \
166 ia64_load_scratch_fpregs(fr); \
167 return ret; \
168}
169
170#define STUB_RESET_SYSTEM(prefix, adjust_arg) \
171static void \
172prefix##_reset_system (int reset_type, efi_status_t status, \
173 unsigned long data_size, efi_char16_t *data) \
174{ \
175 struct ia64_fpreg fr[6]; \
176 efi_char16_t *adata = NULL; \
177 \
178 if (data) \
179 adata = adjust_arg(data); \
180 \
181 ia64_save_scratch_fpregs(fr); \
182 efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system), \
183 reset_type, status, data_size, adata); \
184 /* should not return, but just in case... */ \
185 ia64_load_scratch_fpregs(fr); \
186}
187
188#define phys_ptr(arg) ((__typeof__(arg)) ia64_tpa(arg))
189
190STUB_GET_TIME(phys, phys_ptr)
191STUB_SET_TIME(phys, phys_ptr)
192STUB_GET_WAKEUP_TIME(phys, phys_ptr)
193STUB_SET_WAKEUP_TIME(phys, phys_ptr)
194STUB_GET_VARIABLE(phys, phys_ptr)
195STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
196STUB_SET_VARIABLE(phys, phys_ptr)
197STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
198STUB_RESET_SYSTEM(phys, phys_ptr)
199
200#define id(arg) arg
201
202STUB_GET_TIME(virt, id)
203STUB_SET_TIME(virt, id)
204STUB_GET_WAKEUP_TIME(virt, id)
205STUB_SET_WAKEUP_TIME(virt, id)
206STUB_GET_VARIABLE(virt, id)
207STUB_GET_NEXT_VARIABLE(virt, id)
208STUB_SET_VARIABLE(virt, id)
209STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
210STUB_RESET_SYSTEM(virt, id)
211
212void
213efi_gettimeofday (struct timespec *ts)
214{
215 efi_time_t tm;
216
217 memset(ts, 0, sizeof(ts));
218 if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS)
219 return;
220
221 ts->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
222 ts->tv_nsec = tm.nanosecond;
223}
224
225static int
226is_available_memory (efi_memory_desc_t *md)
227{
228 if (!(md->attribute & EFI_MEMORY_WB))
229 return 0;
230
231 switch (md->type) {
232 case EFI_LOADER_CODE:
233 case EFI_LOADER_DATA:
234 case EFI_BOOT_SERVICES_CODE:
235 case EFI_BOOT_SERVICES_DATA:
236 case EFI_CONVENTIONAL_MEMORY:
237 return 1;
238 }
239 return 0;
240}
241
242/*
243 * Trim descriptor MD so its starts at address START_ADDR. If the descriptor covers
244 * memory that is normally available to the kernel, issue a warning that some memory
245 * is being ignored.
246 */
247static void
248trim_bottom (efi_memory_desc_t *md, u64 start_addr)
249{
250 u64 num_skipped_pages;
251
252 if (md->phys_addr >= start_addr || !md->num_pages)
253 return;
254
255 num_skipped_pages = (start_addr - md->phys_addr) >> EFI_PAGE_SHIFT;
256 if (num_skipped_pages > md->num_pages)
257 num_skipped_pages = md->num_pages;
258
259 if (is_available_memory(md))
260 printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
261 "at 0x%lx\n", __FUNCTION__,
262 (num_skipped_pages << EFI_PAGE_SHIFT) >> 10,
263 md->phys_addr, start_addr - IA64_GRANULE_SIZE);
264 /*
265 * NOTE: Don't set md->phys_addr to START_ADDR because that could cause the memory
266 * descriptor list to become unsorted. In such a case, md->num_pages will be
267 * zero, so the Right Thing will happen.
268 */
269 md->phys_addr += num_skipped_pages << EFI_PAGE_SHIFT;
270 md->num_pages -= num_skipped_pages;
271}
272
273static void
274trim_top (efi_memory_desc_t *md, u64 end_addr)
275{
276 u64 num_dropped_pages, md_end_addr;
277
278 md_end_addr = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
279
280 if (md_end_addr <= end_addr || !md->num_pages)
281 return;
282
283 num_dropped_pages = (md_end_addr - end_addr) >> EFI_PAGE_SHIFT;
284 if (num_dropped_pages > md->num_pages)
285 num_dropped_pages = md->num_pages;
286
287 if (is_available_memory(md))
288 printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
289 "at 0x%lx\n", __FUNCTION__,
290 (num_dropped_pages << EFI_PAGE_SHIFT) >> 10,
291 md->phys_addr, end_addr);
292 md->num_pages -= num_dropped_pages;
293}
294
295/*
296 * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
297 * has memory that is available for OS use.
298 */
299void
300efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
301{
302 int prev_valid = 0;
303 struct range {
304 u64 start;
305 u64 end;
306 } prev, curr;
307 void *efi_map_start, *efi_map_end, *p, *q;
308 efi_memory_desc_t *md, *check_md;
309 u64 efi_desc_size, start, end, granule_addr, last_granule_addr, first_non_wb_addr = 0;
310 unsigned long total_mem = 0;
311
312 efi_map_start = __va(ia64_boot_param->efi_memmap);
313 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
314 efi_desc_size = ia64_boot_param->efi_memdesc_size;
315
316 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
317 md = p;
318
319 /* skip over non-WB memory descriptors; that's all we're interested in... */
320 if (!(md->attribute & EFI_MEMORY_WB))
321 continue;
322
323 /*
324 * granule_addr is the base of md's first granule.
325 * [granule_addr - first_non_wb_addr) is guaranteed to
326 * be contiguous WB memory.
327 */
328 granule_addr = GRANULEROUNDDOWN(md->phys_addr);
329 first_non_wb_addr = max(first_non_wb_addr, granule_addr);
330
331 if (first_non_wb_addr < md->phys_addr) {
332 trim_bottom(md, granule_addr + IA64_GRANULE_SIZE);
333 granule_addr = GRANULEROUNDDOWN(md->phys_addr);
334 first_non_wb_addr = max(first_non_wb_addr, granule_addr);
335 }
336
337 for (q = p; q < efi_map_end; q += efi_desc_size) {
338 check_md = q;
339
340 if ((check_md->attribute & EFI_MEMORY_WB) &&
341 (check_md->phys_addr == first_non_wb_addr))
342 first_non_wb_addr += check_md->num_pages << EFI_PAGE_SHIFT;
343 else
344 break; /* non-WB or hole */
345 }
346
347 last_granule_addr = GRANULEROUNDDOWN(first_non_wb_addr);
348 if (last_granule_addr < md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT))
349 trim_top(md, last_granule_addr);
350
351 if (is_available_memory(md)) {
352 if (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) >= max_addr) {
353 if (md->phys_addr >= max_addr)
354 continue;
355 md->num_pages = (max_addr - md->phys_addr) >> EFI_PAGE_SHIFT;
356 first_non_wb_addr = max_addr;
357 }
358
359 if (total_mem >= mem_limit)
360 continue;
361
362 if (total_mem + (md->num_pages << EFI_PAGE_SHIFT) > mem_limit) {
363 unsigned long limit_addr = md->phys_addr;
364
365 limit_addr += mem_limit - total_mem;
366 limit_addr = GRANULEROUNDDOWN(limit_addr);
367
368 if (md->phys_addr > limit_addr)
369 continue;
370
371 md->num_pages = (limit_addr - md->phys_addr) >>
372 EFI_PAGE_SHIFT;
373 first_non_wb_addr = max_addr = md->phys_addr +
374 (md->num_pages << EFI_PAGE_SHIFT);
375 }
376 total_mem += (md->num_pages << EFI_PAGE_SHIFT);
377
378 if (md->num_pages == 0)
379 continue;
380
381 curr.start = PAGE_OFFSET + md->phys_addr;
382 curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
383
384 if (!prev_valid) {
385 prev = curr;
386 prev_valid = 1;
387 } else {
388 if (curr.start < prev.start)
389 printk(KERN_ERR "Oops: EFI memory table not ordered!\n");
390
391 if (prev.end == curr.start) {
392 /* merge two consecutive memory ranges */
393 prev.end = curr.end;
394 } else {
395 start = PAGE_ALIGN(prev.start);
396 end = prev.end & PAGE_MASK;
397 if ((end > start) && (*callback)(start, end, arg) < 0)
398 return;
399 prev = curr;
400 }
401 }
402 }
403 }
404 if (prev_valid) {
405 start = PAGE_ALIGN(prev.start);
406 end = prev.end & PAGE_MASK;
407 if (end > start)
408 (*callback)(start, end, arg);
409 }
410}
411
412/*
413 * Look for the PAL_CODE region reported by EFI and maps it using an
414 * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor
415 * Abstraction Layer chapter 11 in ADAG
416 */
417
418void *
419efi_get_pal_addr (void)
420{
421 void *efi_map_start, *efi_map_end, *p;
422 efi_memory_desc_t *md;
423 u64 efi_desc_size;
424 int pal_code_count = 0;
425 u64 vaddr, mask;
426
427 efi_map_start = __va(ia64_boot_param->efi_memmap);
428 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
429 efi_desc_size = ia64_boot_param->efi_memdesc_size;
430
431 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
432 md = p;
433 if (md->type != EFI_PAL_CODE)
434 continue;
435
436 if (++pal_code_count > 1) {
437 printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
438 md->phys_addr);
439 continue;
440 }
441 /*
442 * The only ITLB entry in region 7 that is used is the one installed by
443 * __start(). That entry covers a 64MB range.
444 */
445 mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
446 vaddr = PAGE_OFFSET + md->phys_addr;
447
448 /*
449 * We must check that the PAL mapping won't overlap with the kernel
450 * mapping.
451 *
452 * PAL code is guaranteed to be aligned on a power of 2 between 4k and
453 * 256KB and that only one ITR is needed to map it. This implies that the
454 * PAL code is always aligned on its size, i.e., the closest matching page
455 * size supported by the TLB. Therefore PAL code is guaranteed never to
456 * cross a 64MB unless it is bigger than 64MB (very unlikely!). So for
457 * now the following test is enough to determine whether or not we need a
458 * dedicated ITR for the PAL code.
459 */
460 if ((vaddr & mask) == (KERNEL_START & mask)) {
461 printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
462 __FUNCTION__);
463 continue;
464 }
465
466 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
467 panic("Woah! PAL code size bigger than a granule!");
468
469#if EFI_DEBUG
470 mask = ~((1 << IA64_GRANULE_SHIFT) - 1);
471
472 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
473 smp_processor_id(), md->phys_addr,
474 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
475 vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
476#endif
477 return __va(md->phys_addr);
478 }
479 printk(KERN_WARNING "%s: no PAL-code memory-descriptor found",
480 __FUNCTION__);
481 return NULL;
482}
483
484void
485efi_map_pal_code (void)
486{
487 void *pal_vaddr = efi_get_pal_addr ();
488 u64 psr;
489
490 if (!pal_vaddr)
491 return;
492
493 /*
494 * Cannot write to CRx with PSR.ic=1
495 */
496 psr = ia64_clear_ic();
497 ia64_itr(0x1, IA64_TR_PALCODE, GRANULEROUNDDOWN((unsigned long) pal_vaddr),
498 pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
499 IA64_GRANULE_SHIFT);
500 ia64_set_psr(psr); /* restore psr */
501 ia64_srlz_i();
502}
503
504void __init
505efi_init (void)
506{
507 void *efi_map_start, *efi_map_end;
508 efi_config_table_t *config_tables;
509 efi_char16_t *c16;
510 u64 efi_desc_size;
511 char *cp, *end, vendor[100] = "unknown";
512 extern char saved_command_line[];
513 int i;
514
515 /* it's too early to be able to use the standard kernel command line support... */
516 for (cp = saved_command_line; *cp; ) {
517 if (memcmp(cp, "mem=", 4) == 0) {
518 cp += 4;
519 mem_limit = memparse(cp, &end);
520 if (end != cp)
521 break;
522 cp = end;
523 } else if (memcmp(cp, "max_addr=", 9) == 0) {
524 cp += 9;
525 max_addr = GRANULEROUNDDOWN(memparse(cp, &end));
526 if (end != cp)
527 break;
528 cp = end;
529 } else {
530 while (*cp != ' ' && *cp)
531 ++cp;
532 while (*cp == ' ')
533 ++cp;
534 }
535 }
536 if (max_addr != ~0UL)
537 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
538
539 efi.systab = __va(ia64_boot_param->efi_systab);
540
541 /*
542 * Verify the EFI Table
543 */
544 if (efi.systab == NULL)
545 panic("Woah! Can't find EFI system table.\n");
546 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
547 panic("Woah! EFI system table signature incorrect\n");
548 if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
549 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
550 "got %d.%02d, expected %d.%02d\n",
551 efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
552 EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
553
554 config_tables = __va(efi.systab->tables);
555
556 /* Show what we know for posterity */
557 c16 = __va(efi.systab->fw_vendor);
558 if (c16) {
559 for (i = 0;i < (int) sizeof(vendor) && *c16; ++i)
560 vendor[i] = *c16++;
561 vendor[i] = '\0';
562 }
563
564 printk(KERN_INFO "EFI v%u.%.02u by %s:",
565 efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
566
567 for (i = 0; i < (int) efi.systab->nr_tables; i++) {
568 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
569 efi.mps = __va(config_tables[i].table);
570 printk(" MPS=0x%lx", config_tables[i].table);
571 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
572 efi.acpi20 = __va(config_tables[i].table);
573 printk(" ACPI 2.0=0x%lx", config_tables[i].table);
574 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
575 efi.acpi = __va(config_tables[i].table);
576 printk(" ACPI=0x%lx", config_tables[i].table);
577 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
578 efi.smbios = __va(config_tables[i].table);
579 printk(" SMBIOS=0x%lx", config_tables[i].table);
580 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
581 efi.sal_systab = __va(config_tables[i].table);
582 printk(" SALsystab=0x%lx", config_tables[i].table);
583 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
584 efi.hcdp = __va(config_tables[i].table);
585 printk(" HCDP=0x%lx", config_tables[i].table);
586 }
587 }
588 printk("\n");
589
590 runtime = __va(efi.systab->runtime);
591 efi.get_time = phys_get_time;
592 efi.set_time = phys_set_time;
593 efi.get_wakeup_time = phys_get_wakeup_time;
594 efi.set_wakeup_time = phys_set_wakeup_time;
595 efi.get_variable = phys_get_variable;
596 efi.get_next_variable = phys_get_next_variable;
597 efi.set_variable = phys_set_variable;
598 efi.get_next_high_mono_count = phys_get_next_high_mono_count;
599 efi.reset_system = phys_reset_system;
600
601 efi_map_start = __va(ia64_boot_param->efi_memmap);
602 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
603 efi_desc_size = ia64_boot_param->efi_memdesc_size;
604
605#if EFI_DEBUG
606 /* print EFI memory map: */
607 {
608 efi_memory_desc_t *md;
609 void *p;
610
611 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
612 md = p;
613 printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
614 i, md->type, md->attribute, md->phys_addr,
615 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
616 md->num_pages >> (20 - EFI_PAGE_SHIFT));
617 }
618 }
619#endif
620
621 efi_map_pal_code();
622 efi_enter_virtual_mode();
623}
624
625void
626efi_enter_virtual_mode (void)
627{
628 void *efi_map_start, *efi_map_end, *p;
629 efi_memory_desc_t *md;
630 efi_status_t status;
631 u64 efi_desc_size;
632
633 efi_map_start = __va(ia64_boot_param->efi_memmap);
634 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
635 efi_desc_size = ia64_boot_param->efi_memdesc_size;
636
637 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
638 md = p;
639 if (md->attribute & EFI_MEMORY_RUNTIME) {
640 /*
641 * Some descriptors have multiple bits set, so the order of
642 * the tests is relevant.
643 */
644 if (md->attribute & EFI_MEMORY_WB) {
645 md->virt_addr = (u64) __va(md->phys_addr);
646 } else if (md->attribute & EFI_MEMORY_UC) {
647 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
648 } else if (md->attribute & EFI_MEMORY_WC) {
649#if 0
650 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
651 | _PAGE_D
652 | _PAGE_MA_WC
653 | _PAGE_PL_0
654 | _PAGE_AR_RW));
655#else
656 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
657 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
658#endif
659 } else if (md->attribute & EFI_MEMORY_WT) {
660#if 0
661 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
662 | _PAGE_D | _PAGE_MA_WT
663 | _PAGE_PL_0
664 | _PAGE_AR_RW));
665#else
666 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
667 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
668#endif
669 }
670 }
671 }
672
673 status = efi_call_phys(__va(runtime->set_virtual_address_map),
674 ia64_boot_param->efi_memmap_size,
675 efi_desc_size, ia64_boot_param->efi_memdesc_version,
676 ia64_boot_param->efi_memmap);
677 if (status != EFI_SUCCESS) {
678 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
679 "(status=%lu)\n", status);
680 return;
681 }
682
683 /*
684 * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
685 */
686 efi.get_time = virt_get_time;
687 efi.set_time = virt_set_time;
688 efi.get_wakeup_time = virt_get_wakeup_time;
689 efi.set_wakeup_time = virt_set_wakeup_time;
690 efi.get_variable = virt_get_variable;
691 efi.get_next_variable = virt_get_next_variable;
692 efi.set_variable = virt_set_variable;
693 efi.get_next_high_mono_count = virt_get_next_high_mono_count;
694 efi.reset_system = virt_reset_system;
695}
696
697/*
698 * Walk the EFI memory map looking for the I/O port range. There can only be one entry of
699 * this type, other I/O port ranges should be described via ACPI.
700 */
701u64
702efi_get_iobase (void)
703{
704 void *efi_map_start, *efi_map_end, *p;
705 efi_memory_desc_t *md;
706 u64 efi_desc_size;
707
708 efi_map_start = __va(ia64_boot_param->efi_memmap);
709 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
710 efi_desc_size = ia64_boot_param->efi_memdesc_size;
711
712 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
713 md = p;
714 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
715 if (md->attribute & EFI_MEMORY_UC)
716 return md->phys_addr;
717 }
718 }
719 return 0;
720}
721
722u32
723efi_mem_type (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 < (md->num_pages << EFI_PAGE_SHIFT))
737 return md->type;
738 }
739 return 0;
740}
741
742u64
743efi_mem_attributes (unsigned long phys_addr)
744{
745 void *efi_map_start, *efi_map_end, *p;
746 efi_memory_desc_t *md;
747 u64 efi_desc_size;
748
749 efi_map_start = __va(ia64_boot_param->efi_memmap);
750 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
751 efi_desc_size = ia64_boot_param->efi_memdesc_size;
752
753 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
754 md = p;
755
756 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
757 return md->attribute;
758 }
759 return 0;
760}
761EXPORT_SYMBOL(efi_mem_attributes);
762
763int
764valid_phys_addr_range (unsigned long phys_addr, unsigned long *size)
765{
766 void *efi_map_start, *efi_map_end, *p;
767 efi_memory_desc_t *md;
768 u64 efi_desc_size;
769
770 efi_map_start = __va(ia64_boot_param->efi_memmap);
771 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
772 efi_desc_size = ia64_boot_param->efi_memdesc_size;
773
774 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
775 md = p;
776
777 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT)) {
778 if (!(md->attribute & EFI_MEMORY_WB))
779 return 0;
780
781 if (*size > md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr)
782 *size = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr;
783 return 1;
784 }
785 }
786 return 0;
787}
788
789int __init
790efi_uart_console_only(void)
791{
792 efi_status_t status;
793 char *s, name[] = "ConOut";
794 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
795 efi_char16_t *utf16, name_utf16[32];
796 unsigned char data[1024];
797 unsigned long size = sizeof(data);
798 struct efi_generic_dev_path *hdr, *end_addr;
799 int uart = 0;
800
801 /* Convert to UTF-16 */
802 utf16 = name_utf16;
803 s = name;
804 while (*s)
805 *utf16++ = *s++ & 0x7f;
806 *utf16 = 0;
807
808 status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
809 if (status != EFI_SUCCESS) {
810 printk(KERN_ERR "No EFI %s variable?\n", name);
811 return 0;
812 }
813
814 hdr = (struct efi_generic_dev_path *) data;
815 end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
816 while (hdr < end_addr) {
817 if (hdr->type == EFI_DEV_MSG &&
818 hdr->sub_type == EFI_DEV_MSG_UART)
819 uart = 1;
820 else if (hdr->type == EFI_DEV_END_PATH ||
821 hdr->type == EFI_DEV_END_PATH2) {
822 if (!uart)
823 return 0;
824 if (hdr->sub_type == EFI_DEV_END_ENTIRE)
825 return 1;
826 uart = 0;
827 }
828 hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
829 }
830 printk(KERN_ERR "Malformed %s value\n", name);
831 return 0;
832}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-20 21:32:12 -0500