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/kernel.h>
23 #include <linux/init.h>
24 #include <linux/types.h>
25 #include <linux/time.h>
26 #include <linux/proc_fs.h>
27 #include <linux/efi.h>
28
29 #include <asm/io.h>
30 #include <asm/kregs.h>
31 #include <asm/pgtable.h>
32 #include <asm/processor.h>
33 #include <asm/mca.h>
34
35 #define EFI_DEBUG 0
36
37 extern efi_status_t efi_call_phys (void *, ...);
38
39 struct efi efi;
40 static efi_runtime_services_t *runtime;
41
42 /*
43 * efi_dir is allocated here, but the directory isn't created
44 * here, as proc_mkdir() doesn't work this early in the bootup
45 * process. Therefore, each module, like efivars, must test for
46 * if (!efi_dir) efi_dir = proc_mkdir("efi", NULL);
47 * prior to creating their own entries under /proc/efi.
48 */
49 #ifdef CONFIG_PROC_FS
50 struct proc_dir_entry *efi_dir;
51 #endif
52
53 static unsigned long mem_limit = ~0UL;
54
55 #define efi_call_virt(f, args...) (*(f))(args)
56
57 #define STUB_GET_TIME(prefix, adjust_arg) \
58 static efi_status_t \
59 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \
60 { \
61 struct ia64_fpreg fr[6]; \
62 efi_status_t ret; \
63 \
64 ia64_save_scratch_fpregs(fr); \
65 ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm), \
66 adjust_arg(tc)); \
67 ia64_load_scratch_fpregs(fr); \
68 return ret; \
69 }
70
71 #define STUB_SET_TIME(prefix, adjust_arg) \
72 static efi_status_t \
73 prefix##_set_time (efi_time_t *tm) \
74 { \
75 struct ia64_fpreg fr[6]; \
76 efi_status_t ret; \
77 \
78 ia64_save_scratch_fpregs(fr); \
79 ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), adjust_arg(tm)); \
80 ia64_load_scratch_fpregs(fr); \
81 return ret; \
82 }
83
84 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \
85 static efi_status_t \
86 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm) \
87 { \
88 struct ia64_fpreg fr[6]; \
89 efi_status_t ret; \
90 \
91 ia64_save_scratch_fpregs(fr); \
92 ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time), \
93 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm)); \
94 ia64_load_scratch_fpregs(fr); \
95 return ret; \
96 }
97
98 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \
99 static efi_status_t \
100 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \
101 { \
102 struct ia64_fpreg fr[6]; \
103 efi_status_t ret; \
104 \
105 ia64_save_scratch_fpregs(fr); \
106 ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time), \
107 enabled, adjust_arg(tm)); \
108 ia64_load_scratch_fpregs(fr); \
109 return ret; \
110 }
111
112 #define STUB_GET_VARIABLE(prefix, adjust_arg) \
113 static efi_status_t \
114 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \
115 unsigned long *data_size, void *data) \
116 { \
117 struct ia64_fpreg fr[6]; \
118 efi_status_t ret; \
119 \
120 ia64_save_scratch_fpregs(fr); \
121 ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable), \
122 adjust_arg(name), adjust_arg(vendor), adjust_arg(attr), \
123 adjust_arg(data_size), adjust_arg(data)); \
124 ia64_load_scratch_fpregs(fr); \
125 return ret; \
126 }
127
128 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \
129 static efi_status_t \
130 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor) \
131 { \
132 struct ia64_fpreg fr[6]; \
133 efi_status_t ret; \
134 \
135 ia64_save_scratch_fpregs(fr); \
136 ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable), \
137 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor)); \
138 ia64_load_scratch_fpregs(fr); \
139 return ret; \
140 }
141
142 #define STUB_SET_VARIABLE(prefix, adjust_arg) \
143 static efi_status_t \
144 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, u32 attr, \
145 unsigned long data_size, void *data) \
146 { \
147 struct ia64_fpreg fr[6]; \
148 efi_status_t ret; \
149 \
150 ia64_save_scratch_fpregs(fr); \
151 ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable), \
152 adjust_arg(name), adjust_arg(vendor), attr, data_size, \
153 adjust_arg(data)); \
154 ia64_load_scratch_fpregs(fr); \
155 return ret; \
156 }
157
158 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \
159 static efi_status_t \
160 prefix##_get_next_high_mono_count (u64 *count) \
161 { \
162 struct ia64_fpreg fr[6]; \
163 efi_status_t ret; \
164 \
165 ia64_save_scratch_fpregs(fr); \
166 ret = efi_call_##prefix((efi_get_next_high_mono_count_t *) \
167 __va(runtime->get_next_high_mono_count), adjust_arg(count)); \
168 ia64_load_scratch_fpregs(fr); \
169 return ret; \
170 }
171
172 #define STUB_RESET_SYSTEM(prefix, adjust_arg) \
173 static void \
174 prefix##_reset_system (int reset_type, efi_status_t status, \
175 unsigned long data_size, efi_char16_t *data) \
176 { \
177 struct ia64_fpreg fr[6]; \
178 \
179 ia64_save_scratch_fpregs(fr); \
180 efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system), \
181 reset_type, status, data_size, adjust_arg(data)); \
182 /* should not return, but just in case... */ \
183 ia64_load_scratch_fpregs(fr); \
184 }
185
STUB_GET_TIME(phys,__pa)186 STUB_GET_TIME(phys, __pa)
187 STUB_SET_TIME(phys, __pa)
188 STUB_GET_WAKEUP_TIME(phys, __pa)
189 STUB_SET_WAKEUP_TIME(phys, __pa)
190 STUB_GET_VARIABLE(phys, __pa)
191 STUB_GET_NEXT_VARIABLE(phys, __pa)
192 STUB_SET_VARIABLE(phys, __pa)
193 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, __pa)
194 STUB_RESET_SYSTEM(phys, __pa)
195
196 STUB_GET_TIME(virt, )
197 STUB_SET_TIME(virt, )
198 STUB_GET_WAKEUP_TIME(virt, )
199 STUB_SET_WAKEUP_TIME(virt, )
200 STUB_GET_VARIABLE(virt, )
201 STUB_GET_NEXT_VARIABLE(virt, )
202 STUB_SET_VARIABLE(virt, )
203 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, )
204 STUB_RESET_SYSTEM(virt, )
205
206 void
207 efi_gettimeofday (struct timeval *tv)
208 {
209 efi_time_t tm;
210
211 memset(tv, 0, sizeof(tv));
212 if ((*efi.get_time)(&tm, 0) != EFI_SUCCESS)
213 return;
214
215 tv->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
216 tv->tv_usec = tm.nanosecond / 1000;
217 }
218
219 static int
is_available_memory(efi_memory_desc_t * md)220 is_available_memory (efi_memory_desc_t *md)
221 {
222 if (!(md->attribute & EFI_MEMORY_WB))
223 return 0;
224
225 switch (md->type) {
226 case EFI_LOADER_CODE:
227 case EFI_LOADER_DATA:
228 case EFI_BOOT_SERVICES_CODE:
229 case EFI_BOOT_SERVICES_DATA:
230 case EFI_CONVENTIONAL_MEMORY:
231 return 1;
232 }
233 return 0;
234 }
235
236 /*
237 * Trim descriptor MD so its starts at address START_ADDR. If the descriptor covers
238 * memory that is normally available to the kernel, issue a warning that some memory
239 * is being ignored.
240 */
241 static void
trim_bottom(efi_memory_desc_t * md,u64 start_addr)242 trim_bottom (efi_memory_desc_t *md, u64 start_addr)
243 {
244 u64 num_skipped_pages;
245
246 if (md->phys_addr >= start_addr || !md->num_pages)
247 return;
248
249 num_skipped_pages = (start_addr - md->phys_addr) >> EFI_PAGE_SHIFT;
250 if (num_skipped_pages > md->num_pages)
251 num_skipped_pages = md->num_pages;
252
253 if (is_available_memory(md))
254 printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
255 "at 0x%lx\n", __FUNCTION__,
256 (num_skipped_pages << EFI_PAGE_SHIFT) >> 10,
257 md->phys_addr, start_addr - IA64_GRANULE_SIZE);
258 /*
259 * NOTE: Don't set md->phys_addr to START_ADDR because that could cause the memory
260 * descriptor list to become unsorted. In such a case, md->num_pages will be
261 * zero, so the Right Thing will happen.
262 */
263 md->phys_addr += num_skipped_pages << EFI_PAGE_SHIFT;
264 md->num_pages -= num_skipped_pages;
265 }
266
267 static void
trim_top(efi_memory_desc_t * md,u64 end_addr)268 trim_top (efi_memory_desc_t *md, u64 end_addr)
269 {
270 u64 num_dropped_pages, md_end_addr;
271
272 md_end_addr = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
273
274 if (md_end_addr <= end_addr || !md->num_pages)
275 return;
276
277 num_dropped_pages = (md_end_addr - end_addr) >> EFI_PAGE_SHIFT;
278 if (num_dropped_pages > md->num_pages)
279 num_dropped_pages = md->num_pages;
280
281 if (is_available_memory(md))
282 printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
283 "at 0x%lx\n", __FUNCTION__,
284 (num_dropped_pages << EFI_PAGE_SHIFT) >> 10,
285 md->phys_addr, end_addr);
286 md->num_pages -= num_dropped_pages;
287 }
288
289 /*
290 * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
291 * has memory that is available for OS use.
292 */
293 void
efi_memmap_walk(efi_freemem_callback_t callback,void * arg)294 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
295 {
296 int prev_valid = 0;
297 struct range {
298 u64 start;
299 u64 end;
300 } prev, curr;
301 void *efi_map_start, *efi_map_end, *p, *q;
302 efi_memory_desc_t *md, *check_md;
303 u64 efi_desc_size, start, end, granule_addr, last_granule_addr, first_non_wb_addr = 0;
304
305 efi_map_start = __va(ia64_boot_param->efi_memmap);
306 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
307 efi_desc_size = ia64_boot_param->efi_memdesc_size;
308
309 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
310 md = p;
311
312 /* skip over non-WB memory descriptors; that's all we're interested in... */
313 if (!(md->attribute & EFI_MEMORY_WB))
314 continue;
315
316 /*
317 * granule_addr is the base of md's first granule.
318 * [granule_addr - first_non_wb_addr) is guaranteed to
319 * be contiguous WB memory.
320 */
321 granule_addr = md->phys_addr & ~(IA64_GRANULE_SIZE - 1);
322 first_non_wb_addr = max(first_non_wb_addr, granule_addr);
323
324 if (first_non_wb_addr < md->phys_addr) {
325 trim_bottom(md, granule_addr + IA64_GRANULE_SIZE);
326 granule_addr = md->phys_addr & ~(IA64_GRANULE_SIZE - 1);
327 first_non_wb_addr = max(first_non_wb_addr, granule_addr);
328 }
329
330 for (q = p; q < efi_map_end; q += efi_desc_size) {
331 check_md = q;
332
333 if ((check_md->attribute & EFI_MEMORY_WB) &&
334 (check_md->phys_addr == first_non_wb_addr))
335 first_non_wb_addr += check_md->num_pages << EFI_PAGE_SHIFT;
336 else
337 break; /* non-WB or hole */
338 }
339
340 last_granule_addr = first_non_wb_addr & ~(IA64_GRANULE_SIZE - 1);
341 if (last_granule_addr < md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT))
342 trim_top(md, last_granule_addr);
343
344 if (is_available_memory(md)) {
345 if (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) > mem_limit) {
346 if (md->phys_addr > mem_limit)
347 continue;
348 md->num_pages = (mem_limit - md->phys_addr) >> EFI_PAGE_SHIFT;
349 }
350
351 if (md->num_pages == 0)
352 continue;
353
354 curr.start = PAGE_OFFSET + md->phys_addr;
355 curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
356
357 if (!prev_valid) {
358 prev = curr;
359 prev_valid = 1;
360 } else {
361 if (curr.start < prev.start)
362 printk(KERN_ERR "Oops: EFI memory table not ordered!\n");
363
364 if (prev.end == curr.start) {
365 /* merge two consecutive memory ranges */
366 prev.end = curr.end;
367 } else {
368 start = PAGE_ALIGN(prev.start);
369 end = prev.end & PAGE_MASK;
370 if ((end > start) && (*callback)(start, end, arg) < 0)
371 return;
372 prev = curr;
373 }
374 }
375 }
376 }
377 if (prev_valid) {
378 start = PAGE_ALIGN(prev.start);
379 end = prev.end & PAGE_MASK;
380 if (end > start)
381 (*callback)(start, end, arg);
382 }
383 }
384
385 /*
386 * Look for the PAL_CODE region reported by EFI and maps it using an
387 * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor
388 * Abstraction Layer chapter 11 in ADAG
389 */
390 void
efi_map_pal_code(void)391 efi_map_pal_code (void)
392 {
393 void *efi_map_start, *efi_map_end, *p;
394 efi_memory_desc_t *md;
395 u64 efi_desc_size;
396 int pal_code_count = 0;
397 u64 mask, psr;
398 u64 vaddr;
399 #ifdef CONFIG_IA64_MCA
400 int cpu;
401 #endif
402
403 efi_map_start = __va(ia64_boot_param->efi_memmap);
404 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
405 efi_desc_size = ia64_boot_param->efi_memdesc_size;
406
407 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
408 md = p;
409 if (md->type != EFI_PAL_CODE)
410 continue;
411
412 if (++pal_code_count > 1) {
413 printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
414 md->phys_addr);
415 continue;
416 }
417 /*
418 * The only ITLB entry in region 7 that is used is the one installed by
419 * __start(). That entry covers a 64MB range.
420 */
421 mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
422 vaddr = PAGE_OFFSET + md->phys_addr;
423
424 /*
425 * We must check that the PAL mapping won't overlap with the kernel
426 * mapping.
427 *
428 * PAL code is guaranteed to be aligned on a power of 2 between 4k and
429 * 256KB and that only one ITR is needed to map it. This implies that the
430 * PAL code is always aligned on its size, i.e., the closest matching page
431 * size supported by the TLB. Therefore PAL code is guaranteed never to
432 * cross a 64MB unless it is bigger than 64MB (very unlikely!). So for
433 * now the following test is enough to determine whether or not we need a
434 * dedicated ITR for the PAL code.
435 */
436 if ((vaddr & mask) == (KERNEL_START & mask)) {
437 printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
438 __FUNCTION__);
439 continue;
440 }
441
442 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
443 panic("Woah! PAL code size bigger than a granule!");
444
445 mask = ~((1 << IA64_GRANULE_SHIFT) - 1);
446 #if EFI_DEBUG
447 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
448 smp_processor_id(), md->phys_addr,
449 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
450 vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
451 #endif
452
453 /*
454 * Cannot write to CRx with PSR.ic=1
455 */
456 psr = ia64_clear_ic();
457 ia64_itr(0x1, IA64_TR_PALCODE, vaddr & mask,
458 pte_val(mk_pte_phys(md->phys_addr, PAGE_KERNEL)), IA64_GRANULE_SHIFT);
459 ia64_set_psr(psr); /* restore psr */
460 ia64_srlz_i();
461
462 #ifdef CONFIG_IA64_MCA
463 cpu = smp_processor_id();
464
465 /* insert this TR into our list for MCA recovery purposes */
466 ia64_mca_tlb_list[cpu].pal_base=vaddr & mask;
467 ia64_mca_tlb_list[cpu].pal_paddr= pte_val(mk_pte_phys(md->phys_addr, PAGE_KERNEL));
468 #endif
469 }
470 }
471
472 void __init
efi_init(void)473 efi_init (void)
474 {
475 void *efi_map_start, *efi_map_end;
476 efi_config_table_t *config_tables;
477 efi_char16_t *c16;
478 u64 efi_desc_size;
479 char *cp, *end, vendor[100] = "unknown";
480 extern char saved_command_line[];
481 int i;
482
483 /* it's too early to be able to use the standard kernel command line support... */
484 for (cp = saved_command_line; *cp; ) {
485 if (memcmp(cp, "mem=", 4) == 0) {
486 cp += 4;
487 mem_limit = memparse(cp, &end) - 1;
488 if (end != cp)
489 break;
490 cp = end;
491 } else {
492 while (*cp != ' ' && *cp)
493 ++cp;
494 while (*cp == ' ')
495 ++cp;
496 }
497 }
498 if (mem_limit != ~0UL)
499 printk(KERN_INFO "Ignoring memory above %luMB\n", mem_limit >> 20);
500
501 efi.systab = __va(ia64_boot_param->efi_systab);
502
503 /*
504 * Verify the EFI Table
505 */
506 if (efi.systab == NULL)
507 panic("Woah! Can't find EFI system table.\n");
508 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
509 panic("Woah! EFI system table signature incorrect\n");
510 if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
511 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
512 "got %d.%02d, expected %d.%02d\n",
513 efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
514 EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
515
516 config_tables = __va(efi.systab->tables);
517
518 /* Show what we know for posterity */
519 c16 = __va(efi.systab->fw_vendor);
520 if (c16) {
521 for (i = 0;i < sizeof(vendor) && *c16; ++i)
522 vendor[i] = *c16++;
523 vendor[i] = '\0';
524 }
525
526 printk(KERN_INFO "EFI v%u.%.02u by %s:",
527 efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
528
529 for (i = 0; i < efi.systab->nr_tables; i++) {
530 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
531 efi.mps = __va(config_tables[i].table);
532 printk(" MPS=0x%lx", config_tables[i].table);
533 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
534 efi.acpi20 = __va(config_tables[i].table);
535 printk(" ACPI 2.0=0x%lx", config_tables[i].table);
536 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
537 efi.acpi = __va(config_tables[i].table);
538 printk(" ACPI=0x%lx", config_tables[i].table);
539 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
540 efi.smbios = __va(config_tables[i].table);
541 printk(" SMBIOS=0x%lx", config_tables[i].table);
542 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
543 efi.sal_systab = __va(config_tables[i].table);
544 printk(" SALsystab=0x%lx", config_tables[i].table);
545 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
546 efi.hcdp = __va(config_tables[i].table);
547 printk(" HCDP=0x%lx", config_tables[i].table);
548 }
549 }
550 printk("\n");
551
552 runtime = __va(efi.systab->runtime);
553 efi.get_time = phys_get_time;
554 efi.set_time = phys_set_time;
555 efi.get_wakeup_time = phys_get_wakeup_time;
556 efi.set_wakeup_time = phys_set_wakeup_time;
557 efi.get_variable = phys_get_variable;
558 efi.get_next_variable = phys_get_next_variable;
559 efi.set_variable = phys_set_variable;
560 efi.get_next_high_mono_count = phys_get_next_high_mono_count;
561 efi.reset_system = phys_reset_system;
562
563 efi_map_start = __va(ia64_boot_param->efi_memmap);
564 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
565 efi_desc_size = ia64_boot_param->efi_memdesc_size;
566
567 #if EFI_DEBUG
568 /* print EFI memory map: */
569 {
570 efi_memory_desc_t *md;
571 void *p;
572
573 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
574 md = p;
575 printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
576 i, md->type, md->attribute, md->phys_addr,
577 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
578 md->num_pages >> (20 - EFI_PAGE_SHIFT));
579 }
580 }
581 #endif
582
583 efi_map_pal_code();
584 efi_enter_virtual_mode();
585 }
586
587 void
efi_enter_virtual_mode(void)588 efi_enter_virtual_mode (void)
589 {
590 void *efi_map_start, *efi_map_end, *p;
591 efi_memory_desc_t *md;
592 efi_status_t status;
593 u64 efi_desc_size;
594
595 efi_map_start = __va(ia64_boot_param->efi_memmap);
596 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
597 efi_desc_size = ia64_boot_param->efi_memdesc_size;
598
599 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
600 md = p;
601 if (md->attribute & EFI_MEMORY_RUNTIME) {
602 /*
603 * Some descriptors have multiple bits set, so the order of
604 * the tests is relevant.
605 */
606 if (md->attribute & EFI_MEMORY_WB) {
607 md->virt_addr = (u64) __va(md->phys_addr);
608 } else if (md->attribute & EFI_MEMORY_UC) {
609 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
610 } else if (md->attribute & EFI_MEMORY_WC) {
611 #if 0
612 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
613 | _PAGE_D
614 | _PAGE_MA_WC
615 | _PAGE_PL_0
616 | _PAGE_AR_RW));
617 #else
618 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
619 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
620 #endif
621 } else if (md->attribute & EFI_MEMORY_WT) {
622 #if 0
623 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
624 | _PAGE_D | _PAGE_MA_WT
625 | _PAGE_PL_0
626 | _PAGE_AR_RW));
627 #else
628 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
629 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
630 #endif
631 }
632 }
633 }
634
635 status = efi_call_phys(__va(runtime->set_virtual_address_map),
636 ia64_boot_param->efi_memmap_size,
637 efi_desc_size, ia64_boot_param->efi_memdesc_version,
638 ia64_boot_param->efi_memmap);
639 if (status != EFI_SUCCESS) {
640 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode (status=0x%lx)\n", status);
641 return;
642 }
643
644 /*
645 * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
646 */
647 efi.get_time = virt_get_time;
648 efi.set_time = virt_set_time;
649 efi.get_wakeup_time = virt_get_wakeup_time;
650 efi.set_wakeup_time = virt_set_wakeup_time;
651 efi.get_variable = virt_get_variable;
652 efi.get_next_variable = virt_get_next_variable;
653 efi.set_variable = virt_set_variable;
654 efi.get_next_high_mono_count = virt_get_next_high_mono_count;
655 efi.reset_system = virt_reset_system;
656 }
657
658 /*
659 * Walk the EFI memory map looking for the I/O port range. There can only be one entry of
660 * this type, other I/O port ranges should be described via ACPI.
661 */
662 u64
efi_get_iobase(void)663 efi_get_iobase (void)
664 {
665 void *efi_map_start, *efi_map_end, *p;
666 efi_memory_desc_t *md;
667 u64 efi_desc_size;
668
669 efi_map_start = __va(ia64_boot_param->efi_memmap);
670 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
671 efi_desc_size = ia64_boot_param->efi_memdesc_size;
672
673 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
674 md = p;
675 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
676 if (md->attribute & EFI_MEMORY_UC)
677 return md->phys_addr;
678 }
679 }
680 return 0;
681 }
682
683 u32
efi_mem_type(unsigned long phys_addr)684 efi_mem_type (unsigned long phys_addr)
685 {
686 void *efi_map_start, *efi_map_end, *p;
687 efi_memory_desc_t *md;
688 u64 efi_desc_size;
689
690 efi_map_start = __va(ia64_boot_param->efi_memmap);
691 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
692 efi_desc_size = ia64_boot_param->efi_memdesc_size;
693
694 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
695 md = p;
696
697 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
698 return md->type;
699 }
700 return 0;
701 }
702
703 u64
efi_mem_attributes(unsigned long phys_addr)704 efi_mem_attributes (unsigned long phys_addr)
705 {
706 void *efi_map_start, *efi_map_end, *p;
707 efi_memory_desc_t *md;
708 u64 efi_desc_size;
709
710 efi_map_start = __va(ia64_boot_param->efi_memmap);
711 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
712 efi_desc_size = ia64_boot_param->efi_memdesc_size;
713
714 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
715 md = p;
716
717 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
718 return md->attribute;
719 }
720 return 0;
721 }
722
723 static void __exit
efivars_exit(void)724 efivars_exit (void)
725 {
726 #ifdef CONFIG_PROC_FS
727 remove_proc_entry(efi_dir->name, NULL);
728 #endif
729 }
730