projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] hpet: use read_timer_tsc only when CPU has TSC
[deliverable/linux.git] / arch / i386 / kernel / efi.c
CommitLineData
1da177e4
LT		 1/*
2 * Extensible Firmware Interface
3 *
4 * Based on Extensible Firmware Interface Specification version 1.0
5 *
6 * Copyright (C) 1999 VA Linux Systems
7 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
8 * Copyright (C) 1999-2002 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
22#include <linux/config.h>
23#include <linux/kernel.h>
24#include <linux/init.h>
25#include <linux/mm.h>
26#include <linux/types.h>
27#include <linux/time.h>
28#include <linux/spinlock.h>
29#include <linux/bootmem.h>
30#include <linux/ioport.h>
31#include <linux/module.h>
32#include <linux/efi.h>
1bc3b91a 33#include <linux/kexec.h>
1da177e4
LT		 34
35#include <asm/setup.h>
36#include <asm/io.h>
37#include <asm/page.h>
38#include <asm/pgtable.h>
39#include <asm/processor.h>
40#include <asm/desc.h>
41#include <asm/tlbflush.h>
42
43#define EFI_DEBUG 0
44#define PFX "EFI: "
45
46extern efi_status_t asmlinkage efi_call_phys(void *, ...);
47
48struct efi efi;
49EXPORT_SYMBOL(efi);
c41f5eb3 50static struct efi efi_phys;
51struct efi_memory_map memmap;
1da177e4
LT		 52
53/*
54 * We require an early boot_ioremap mapping mechanism initially
55 */
56extern void * boot_ioremap(unsigned long, unsigned long);
57
58/*
59 * To make EFI call EFI runtime service in physical addressing mode we need
60 * prelog/epilog before/after the invocation to disable interrupt, to
61 * claim EFI runtime service handler exclusively and to duplicate a memory in
62 * low memory space say 0 - 3G.
63 */
64
65static unsigned long efi_rt_eflags;
66static DEFINE_SPINLOCK(efi_rt_lock);
67static pgd_t efi_bak_pg_dir_pointer[2];
68
69static void efi_call_phys_prelog(void)
70{
71 unsigned long cr4;
72 unsigned long temp;
73
74 spin_lock(&efi_rt_lock);
75 local_irq_save(efi_rt_eflags);
76
77 /*
78 * If I don't have PSE, I should just duplicate two entries in page
79 * directory. If I have PSE, I just need to duplicate one entry in
80 * page directory.
81 */
82 __asm__ __volatile__("movl %%cr4, %0":"=r"(cr4));
83
84 if (cr4 & X86_CR4_PSE) {
85 efi_bak_pg_dir_pointer[0].pgd =
86 swapper_pg_dir[pgd_index(0)].pgd;
87 swapper_pg_dir[0].pgd =
88 swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
89 } else {
90 efi_bak_pg_dir_pointer[0].pgd =
91 swapper_pg_dir[pgd_index(0)].pgd;
92 efi_bak_pg_dir_pointer[1].pgd =
93 swapper_pg_dir[pgd_index(0x400000)].pgd;
94 swapper_pg_dir[pgd_index(0)].pgd =
95 swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
96 temp = PAGE_OFFSET + 0x400000;
97 swapper_pg_dir[pgd_index(0x400000)].pgd =
98 swapper_pg_dir[pgd_index(temp)].pgd;
99 }
100
101 /*
102 * After the lock is released, the original page table is restored.
103 */
104 local_flush_tlb();
105
106 cpu_gdt_descr[0].address = __pa(cpu_gdt_descr[0].address);
107 __asm__ __volatile__("lgdt %0":"=m"
108 (*(struct Xgt_desc_struct *) __pa(&cpu_gdt_descr[0])));
109}
110
111static void efi_call_phys_epilog(void)
112{
113 unsigned long cr4;
114
115 cpu_gdt_descr[0].address =
116 (unsigned long) __va(cpu_gdt_descr[0].address);
117 __asm__ __volatile__("lgdt %0":"=m"(cpu_gdt_descr));
118 __asm__ __volatile__("movl %%cr4, %0":"=r"(cr4));
119
120 if (cr4 & X86_CR4_PSE) {
121 swapper_pg_dir[pgd_index(0)].pgd =
122 efi_bak_pg_dir_pointer[0].pgd;
123 } else {
124 swapper_pg_dir[pgd_index(0)].pgd =
125 efi_bak_pg_dir_pointer[0].pgd;
126 swapper_pg_dir[pgd_index(0x400000)].pgd =
127 efi_bak_pg_dir_pointer[1].pgd;
128 }
129
130 /*
131 * After the lock is released, the original page table is restored.
132 */
133 local_flush_tlb();
134
135 local_irq_restore(efi_rt_eflags);
136 spin_unlock(&efi_rt_lock);
137}
138
139static efi_status_t
140phys_efi_set_virtual_address_map(unsigned long memory_map_size,
141 unsigned long descriptor_size,
142 u32 descriptor_version,
143 efi_memory_desc_t *virtual_map)
144{
145 efi_status_t status;
146
147 efi_call_phys_prelog();
148 status = efi_call_phys(efi_phys.set_virtual_address_map,
149 memory_map_size, descriptor_size,
150 descriptor_version, virtual_map);
151 efi_call_phys_epilog();
152 return status;
153}
154
155static efi_status_t
156phys_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
157{
158 efi_status_t status;
159
160 efi_call_phys_prelog();
161 status = efi_call_phys(efi_phys.get_time, tm, tc);
162 efi_call_phys_epilog();
163 return status;
164}
165
166inline int efi_set_rtc_mmss(unsigned long nowtime)
167{
168 int real_seconds, real_minutes;
169 efi_status_t status;
170 efi_time_t eft;
171 efi_time_cap_t cap;
172
173 spin_lock(&efi_rt_lock);
174 status = efi.get_time(&eft, &cap);
175 spin_unlock(&efi_rt_lock);
176 if (status != EFI_SUCCESS)
177 panic("Ooops, efitime: can't read time!\n");
178 real_seconds = nowtime % 60;
179 real_minutes = nowtime / 60;
180
181 if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
182 real_minutes += 30;
183 real_minutes %= 60;
184
185 eft.minute = real_minutes;
186 eft.second = real_seconds;
187
188 if (status != EFI_SUCCESS) {
189 printk("Ooops: efitime: can't read time!\n");
190 return -1;
191 }
192 return 0;
193}
194/*
195 * This should only be used during kernel init and before runtime
196 * services have been remapped, therefore, we'll need to call in physical
197 * mode. Note, this call isn't used later, so mark it __init.
198 */
199inline unsigned long __init efi_get_time(void)
200{
201 efi_status_t status;
202 efi_time_t eft;
203 efi_time_cap_t cap;
204
205 status = phys_efi_get_time(&eft, &cap);
206 if (status != EFI_SUCCESS)
207 printk("Oops: efitime: can't read time status: 0x%lx\n",status);
208
209 return mktime(eft.year, eft.month, eft.day, eft.hour,
210 eft.minute, eft.second);
211}
212
213int is_available_memory(efi_memory_desc_t * md)
214{
215 if (!(md->attribute & EFI_MEMORY_WB))
216 return 0;
217
218 switch (md->type) {
219 case EFI_LOADER_CODE:
220 case EFI_LOADER_DATA:
221 case EFI_BOOT_SERVICES_CODE:
222 case EFI_BOOT_SERVICES_DATA:
223 case EFI_CONVENTIONAL_MEMORY:
224 return 1;
225 }
226 return 0;
227}
228
229/*
230 * We need to map the EFI memory map again after paging_init().
231 */
232void __init efi_map_memmap(void)
233{
234 memmap.map = NULL;
235
236 memmap.map = (efi_memory_desc_t *)
237 bt_ioremap((unsigned long) memmap.phys_map,
238 (memmap.nr_map * sizeof(efi_memory_desc_t)));
239
240 if (memmap.map == NULL)
241 printk(KERN_ERR PFX "Could not remap the EFI memmap!\n");
242}
243
244#if EFI_DEBUG
245static void __init print_efi_memmap(void)
246{
247 efi_memory_desc_t *md;
248 int i;
249
250 for (i = 0; i < memmap.nr_map; i++) {
251 md = &memmap.map[i];
252 printk(KERN_INFO "mem%02u: type=%u, attr=0x%llx, "
253 "range=[0x%016llx-0x%016llx) (%lluMB)\n",
254 i, md->type, md->attribute, md->phys_addr,
255 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
256 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
257 }
258}
259#endif /* EFI_DEBUG */
260
261/*
262 * Walks the EFI memory map and calls CALLBACK once for each EFI
263 * memory descriptor that has memory that is available for kernel use.
264 */
265void efi_memmap_walk(efi_freemem_callback_t callback, void *arg)
266{
267 int prev_valid = 0;
268 struct range {
269 unsigned long start;
270 unsigned long end;
271 } prev, curr;
272 efi_memory_desc_t *md;
273 unsigned long start, end;
274 int i;
275
276 for (i = 0; i < memmap.nr_map; i++) {
277 md = &memmap.map[i];
278
279 if ((md->num_pages == 0) || (!is_available_memory(md)))
280 continue;
281
282 curr.start = md->phys_addr;
283 curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
284
285 if (!prev_valid) {
286 prev = curr;
287 prev_valid = 1;
288 } else {
289 if (curr.start < prev.start)
290 printk(KERN_INFO PFX "Unordered memory map\n");
291 if (prev.end == curr.start)
292 prev.end = curr.end;
293 else {
294 start =
295 (unsigned long) (PAGE_ALIGN(prev.start));
296 end = (unsigned long) (prev.end & PAGE_MASK);
297 if ((end > start)
298 && (*callback) (start, end, arg) < 0)
299 return;
300 prev = curr;
301 }
302 }
303 }
304 if (prev_valid) {
305 start = (unsigned long) PAGE_ALIGN(prev.start);
306 end = (unsigned long) (prev.end & PAGE_MASK);
307 if (end > start)
308 (*callback) (start, end, arg);
309 }
310}
311
312void __init efi_init(void)
313{
314 efi_config_table_t *config_tables;
315 efi_runtime_services_t *runtime;
316 efi_char16_t *c16;
317 char vendor[100] = "unknown";
318 unsigned long num_config_tables;
319 int i = 0;
320
321 memset(&efi, 0, sizeof(efi) );
322 memset(&efi_phys, 0, sizeof(efi_phys));
323
324 efi_phys.systab = EFI_SYSTAB;
325 memmap.phys_map = EFI_MEMMAP;
326 memmap.nr_map = EFI_MEMMAP_SIZE/EFI_MEMDESC_SIZE;
327 memmap.desc_version = EFI_MEMDESC_VERSION;
328
329 efi.systab = (efi_system_table_t *)
330 boot_ioremap((unsigned long) efi_phys.systab,
331 sizeof(efi_system_table_t));
332 /*
333 * Verify the EFI Table
334 */
335 if (efi.systab == NULL)
336 printk(KERN_ERR PFX "Woah! Couldn't map the EFI system table.\n");
337 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
338 printk(KERN_ERR PFX "Woah! EFI system table signature incorrect\n");
339 if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
340 printk(KERN_ERR PFX
341 "Warning: EFI system table major version mismatch: "
342 "got %d.%02d, expected %d.%02d\n",
343 efi.systab->hdr.revision >> 16,
344 efi.systab->hdr.revision & 0xffff,
345 EFI_SYSTEM_TABLE_REVISION >> 16,
346 EFI_SYSTEM_TABLE_REVISION & 0xffff);
347 /*
348 * Grab some details from the system table
349 */
350 num_config_tables = efi.systab->nr_tables;
351 config_tables = (efi_config_table_t *)efi.systab->tables;
352 runtime = efi.systab->runtime;
353
354 /*
355 * Show what we know for posterity
356 */
357 c16 = (efi_char16_t *) boot_ioremap(efi.systab->fw_vendor, 2);
358 if (c16) {
359 for (i = 0; i < sizeof(vendor) && *c16; ++i)
360 vendor[i] = *c16++;
361 vendor[i] = '\0';
362 } else
363 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
364
365 printk(KERN_INFO PFX "EFI v%u.%.02u by %s \n",
366 efi.systab->hdr.revision >> 16,
367 efi.systab->hdr.revision & 0xffff, vendor);
368
369 /*
370 * Let's see what config tables the firmware passed to us.
371 */
372 config_tables = (efi_config_table_t *)
373 boot_ioremap((unsigned long) config_tables,
374 num_config_tables * sizeof(efi_config_table_t));
375
376 if (config_tables == NULL)
377 printk(KERN_ERR PFX "Could not map EFI Configuration Table!\n");
378
379 for (i = 0; i < num_config_tables; i++) {
380 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
381 efi.mps = (void *)config_tables[i].table;
382 printk(KERN_INFO " MPS=0x%lx ", config_tables[i].table);
383 } else
384 if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
385 efi.acpi20 = __va(config_tables[i].table);
386 printk(KERN_INFO " ACPI 2.0=0x%lx ", config_tables[i].table);
387 } else
388 if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
389 efi.acpi = __va(config_tables[i].table);
390 printk(KERN_INFO " ACPI=0x%lx ", config_tables[i].table);
391 } else
392 if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
393 efi.smbios = (void *) config_tables[i].table;
394 printk(KERN_INFO " SMBIOS=0x%lx ", config_tables[i].table);
395 } else
396 if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
397 efi.hcdp = (void *)config_tables[i].table;
398 printk(KERN_INFO " HCDP=0x%lx ", config_tables[i].table);
399 } else
400 if (efi_guidcmp(config_tables[i].guid, UGA_IO_PROTOCOL_GUID) == 0) {
401 efi.uga = (void *)config_tables[i].table;
402 printk(KERN_INFO " UGA=0x%lx ", config_tables[i].table);
403 }
404 }
405 printk("\n");
406
407 /*
408 * Check out the runtime services table. We need to map
409 * the runtime services table so that we can grab the physical
410 * address of several of the EFI runtime functions, needed to
411 * set the firmware into virtual mode.
412 */
413
414 runtime = (efi_runtime_services_t *) boot_ioremap((unsigned long)
415 runtime,
416 sizeof(efi_runtime_services_t));
417 if (runtime != NULL) {
418 /*
419 * We will only need *early* access to the following
420 * two EFI runtime services before set_virtual_address_map
421 * is invoked.
422 */
423 efi_phys.get_time = (efi_get_time_t *) runtime->get_time;
424 efi_phys.set_virtual_address_map =
425 (efi_set_virtual_address_map_t *)
426 runtime->set_virtual_address_map;
427 } else
428 printk(KERN_ERR PFX "Could not map the runtime service table!\n");
429
430 /* Map the EFI memory map for use until paging_init() */
431
432 memmap.map = (efi_memory_desc_t *)
433 boot_ioremap((unsigned long) EFI_MEMMAP, EFI_MEMMAP_SIZE);
434
435 if (memmap.map == NULL)
436 printk(KERN_ERR PFX "Could not map the EFI memory map!\n");
437
438 if (EFI_MEMDESC_SIZE != sizeof(efi_memory_desc_t)) {
439 printk(KERN_WARNING PFX "Warning! Kernel-defined memdesc doesn't "
440 "match the one from EFI!\n");
441 }
442#if EFI_DEBUG
443 print_efi_memmap();
444#endif
445}
446
447/*
448 * This function will switch the EFI runtime services to virtual mode.
449 * Essentially, look through the EFI memmap and map every region that
450 * has the runtime attribute bit set in its memory descriptor and update
451 * that memory descriptor with the virtual address obtained from ioremap().
452 * This enables the runtime services to be called without having to
453 * thunk back into physical mode for every invocation.
454 */
455
456void __init efi_enter_virtual_mode(void)
457{
458 efi_memory_desc_t *md;
459 efi_status_t status;
460 int i;
461
462 efi.systab = NULL;
463
464 for (i = 0; i < memmap.nr_map; i++) {
465 md = &memmap.map[i];
466
467 if (md->attribute & EFI_MEMORY_RUNTIME) {
468 md->virt_addr =
469 (unsigned long)ioremap(md->phys_addr,
470 md->num_pages << EFI_PAGE_SHIFT);
471 if (!(unsigned long)md->virt_addr) {
472 printk(KERN_ERR PFX "ioremap of 0x%lX failed\n",
473 (unsigned long)md->phys_addr);
474 }
475
476 if (((unsigned long)md->phys_addr <=
477 (unsigned long)efi_phys.systab) &&
478 ((unsigned long)efi_phys.systab <
479 md->phys_addr +
480 ((unsigned long)md->num_pages <<
481 EFI_PAGE_SHIFT))) {
482 unsigned long addr;
483
484 addr = md->virt_addr - md->phys_addr +
485 (unsigned long)efi_phys.systab;
486 efi.systab = (efi_system_table_t *)addr;
487 }
488 }
489 }
490
491 if (!efi.systab)
492 BUG();
493
494 status = phys_efi_set_virtual_address_map(
495 sizeof(efi_memory_desc_t) * memmap.nr_map,
496 sizeof(efi_memory_desc_t),
497 memmap.desc_version,
498 memmap.phys_map);
499
500 if (status != EFI_SUCCESS) {
501 printk (KERN_ALERT "You are screwed! "
502 "Unable to switch EFI into virtual mode "
503 "(status=%lx)\n", status);
504 panic("EFI call to SetVirtualAddressMap() failed!");
505 }
506
507 /*
508 * Now that EFI is in virtual mode, update the function
509 * pointers in the runtime service table to the new virtual addresses.
510 */
511
512 efi.get_time = (efi_get_time_t *) efi.systab->runtime->get_time;
513 efi.set_time = (efi_set_time_t *) efi.systab->runtime->set_time;
514 efi.get_wakeup_time = (efi_get_wakeup_time_t *)
515 efi.systab->runtime->get_wakeup_time;
516 efi.set_wakeup_time = (efi_set_wakeup_time_t *)
517 efi.systab->runtime->set_wakeup_time;
518 efi.get_variable = (efi_get_variable_t *)
519 efi.systab->runtime->get_variable;
520 efi.get_next_variable = (efi_get_next_variable_t *)
521 efi.systab->runtime->get_next_variable;
522 efi.set_variable = (efi_set_variable_t *)
523 efi.systab->runtime->set_variable;
524 efi.get_next_high_mono_count = (efi_get_next_high_mono_count_t *)
525 efi.systab->runtime->get_next_high_mono_count;
526 efi.reset_system = (efi_reset_system_t *)
527 efi.systab->runtime->reset_system;
528}
529
530void __init
531efi_initialize_iomem_resources(struct resource *code_resource,
532 struct resource *data_resource)
533{
534 struct resource *res;
535 efi_memory_desc_t *md;
536 int i;
537
538 for (i = 0; i < memmap.nr_map; i++) {
539 md = &memmap.map[i];
540
541 if ((md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >
542 0x100000000ULL)
543 continue;
544 res = alloc_bootmem_low(sizeof(struct resource));
545 switch (md->type) {
546 case EFI_RESERVED_TYPE:
547 res->name = "Reserved Memory";
548 break;
549 case EFI_LOADER_CODE:
550 res->name = "Loader Code";
551 break;
552 case EFI_LOADER_DATA:
553 res->name = "Loader Data";
554 break;
555 case EFI_BOOT_SERVICES_DATA:
556 res->name = "BootServices Data";
557 break;
558 case EFI_BOOT_SERVICES_CODE:
559 res->name = "BootServices Code";
560 break;
561 case EFI_RUNTIME_SERVICES_CODE:
562 res->name = "Runtime Service Code";
563 break;
564 case EFI_RUNTIME_SERVICES_DATA:
565 res->name = "Runtime Service Data";
566 break;
567 case EFI_CONVENTIONAL_MEMORY:
568 res->name = "Conventional Memory";
569 break;
570 case EFI_UNUSABLE_MEMORY:
571 res->name = "Unusable Memory";
572 break;
573 case EFI_ACPI_RECLAIM_MEMORY:
574 res->name = "ACPI Reclaim";
575 break;
576 case EFI_ACPI_MEMORY_NVS:
577 res->name = "ACPI NVS";
578 break;
579 case EFI_MEMORY_MAPPED_IO:
580 res->name = "Memory Mapped IO";
581 break;
582 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
583 res->name = "Memory Mapped IO Port Space";
584 break;
585 default:
586 res->name = "Reserved";
587 break;
588 }
589 res->start = md->phys_addr;
590 res->end = res->start + ((md->num_pages << EFI_PAGE_SHIFT) - 1);
591 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
592 if (request_resource(&iomem_resource, res) < 0)
593 printk(KERN_ERR PFX "Failed to allocate res %s : 0x%lx-0x%lx\n",
594 res->name, res->start, res->end);
595 /*
596 * We don't know which region contains kernel data so we try
597 * it repeatedly and let the resource manager test it.
598 */
599 if (md->type == EFI_CONVENTIONAL_MEMORY) {
600 request_resource(res, code_resource);
601 request_resource(res, data_resource);
1bc3b91a
EB		 602#ifdef CONFIG_KEXEC
603 request_resource(res, &crashk_res);
604#endif
1da177e4
LT		 605 }
606 }
607}
608
609/*
610 * Convenience functions to obtain memory types and attributes
611 */
612
613u32 efi_mem_type(unsigned long phys_addr)
614{
615 efi_memory_desc_t *md;
616 int i;
617
618 for (i = 0; i < memmap.nr_map; i++) {
619 md = &memmap.map[i];
620 if ((md->phys_addr <= phys_addr) && (phys_addr <
621 (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
622 return md->type;
623 }
624 return 0;
625}
626
627u64 efi_mem_attributes(unsigned long phys_addr)
628{
629 efi_memory_desc_t *md;
630 int i;
631
632 for (i = 0; i < memmap.nr_map; i++) {
633 md = &memmap.map[i];
634 if ((md->phys_addr <= phys_addr) && (phys_addr <
635 (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
636 return md->attribute;
637 }
638 return 0;
639}
Linux kernel - Deliverables
This page took 0.081624 seconds and 5 git commands to generate.