projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] x86_64: Move ondemand timer into own work queue
[linux-2.6-block.git] / arch / ia64 / kernel / efi.c
CommitLineData
1da177e4
LT		 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
d8c97d5f
TL		 242typedef struct kern_memdesc {
243 u64 attribute;
244 u64 start;
245 u64 num_pages;
246} kern_memdesc_t;
1da177e4 247
d8c97d5f 248static kern_memdesc_t *kern_memmap;
1da177e4 249
80851ef2
BH		 250#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
251
252static inline u64
253kmd_end(kern_memdesc_t *kmd)
254{
255 return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
256}
257
258static inline u64
259efi_md_end(efi_memory_desc_t *md)
260{
261 return (md->phys_addr + efi_md_size(md));
262}
263
264static inline int
265efi_wb(efi_memory_desc_t *md)
266{
267 return (md->attribute & EFI_MEMORY_WB);
268}
269
270static inline int
271efi_uc(efi_memory_desc_t *md)
272{
273 return (md->attribute & EFI_MEMORY_UC);
274}
275
1da177e4 276static void
d8c97d5f 277walk (efi_freemem_callback_t callback, void *arg, u64 attr)
1da177e4 278{
d8c97d5f
TL		 279 kern_memdesc_t *k;
280 u64 start, end, voff;
1da177e4 281
d8c97d5f
TL		 282 voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
283 for (k = kern_memmap; k->start != ~0UL; k++) {
284 if (k->attribute != attr)
285 continue;
286 start = PAGE_ALIGN(k->start);
287 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
288 if (start < end)
289 if ((*callback)(start + voff, end + voff, arg) < 0)
290 return;
291 }
1da177e4
LT		 292}
293
294/*
295 * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
296 * has memory that is available for OS use.
297 */
298void
299efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
300{
d8c97d5f 301 walk(callback, arg, EFI_MEMORY_WB);
1da177e4
LT		 302}
303
f14f75b8 304/*
d8c97d5f
TL		 305 * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
306 * has memory that is available for uncached allocator.
f14f75b8 307 */
d8c97d5f
TL		 308void
309efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
f14f75b8 310{
d8c97d5f 311 walk(callback, arg, EFI_MEMORY_UC);
f14f75b8
JS		 312}
313
1da177e4
LT		 314/*
315 * Look for the PAL_CODE region reported by EFI and maps it using an
316 * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor
317 * Abstraction Layer chapter 11 in ADAG
318 */
319
320void *
321efi_get_pal_addr (void)
322{
323 void *efi_map_start, *efi_map_end, *p;
324 efi_memory_desc_t *md;
325 u64 efi_desc_size;
326 int pal_code_count = 0;
327 u64 vaddr, mask;
328
329 efi_map_start = __va(ia64_boot_param->efi_memmap);
330 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
331 efi_desc_size = ia64_boot_param->efi_memdesc_size;
332
333 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
334 md = p;
335 if (md->type != EFI_PAL_CODE)
336 continue;
337
338 if (++pal_code_count > 1) {
339 printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
340 md->phys_addr);
341 continue;
342 }
343 /*
344 * The only ITLB entry in region 7 that is used is the one installed by
345 * __start(). That entry covers a 64MB range.
346 */
347 mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
348 vaddr = PAGE_OFFSET + md->phys_addr;
349
350 /*
351 * We must check that the PAL mapping won't overlap with the kernel
352 * mapping.
353 *
354 * PAL code is guaranteed to be aligned on a power of 2 between 4k and
355 * 256KB and that only one ITR is needed to map it. This implies that the
356 * PAL code is always aligned on its size, i.e., the closest matching page
357 * size supported by the TLB. Therefore PAL code is guaranteed never to
358 * cross a 64MB unless it is bigger than 64MB (very unlikely!). So for
359 * now the following test is enough to determine whether or not we need a
360 * dedicated ITR for the PAL code.
361 */
362 if ((vaddr & mask) == (KERNEL_START & mask)) {
363 printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
364 __FUNCTION__);
365 continue;
366 }
367
368 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
369 panic("Woah! PAL code size bigger than a granule!");
370
371#if EFI_DEBUG
372 mask = ~((1 << IA64_GRANULE_SHIFT) - 1);
373
374 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
375 smp_processor_id(), md->phys_addr,
376 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
377 vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
378#endif
379 return __va(md->phys_addr);
380 }
381 printk(KERN_WARNING "%s: no PAL-code memory-descriptor found",
382 __FUNCTION__);
383 return NULL;
384}
385
386void
387efi_map_pal_code (void)
388{
389 void *pal_vaddr = efi_get_pal_addr ();
390 u64 psr;
391
392 if (!pal_vaddr)
393 return;
394
395 /*
396 * Cannot write to CRx with PSR.ic=1
397 */
398 psr = ia64_clear_ic();
399 ia64_itr(0x1, IA64_TR_PALCODE, GRANULEROUNDDOWN((unsigned long) pal_vaddr),
400 pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
401 IA64_GRANULE_SHIFT);
402 ia64_set_psr(psr); /* restore psr */
403 ia64_srlz_i();
404}
405
406void __init
407efi_init (void)
408{
409 void *efi_map_start, *efi_map_end;
410 efi_config_table_t *config_tables;
411 efi_char16_t *c16;
412 u64 efi_desc_size;
9d78f43d 413 char *cp, vendor[100] = "unknown";
1da177e4
LT		 414 extern char saved_command_line[];
415 int i;
416
417 /* it's too early to be able to use the standard kernel command line support... */
418 for (cp = saved_command_line; *cp; ) {
419 if (memcmp(cp, "mem=", 4) == 0) {
9d78f43d 420 mem_limit = memparse(cp + 4, &cp);
1da177e4 421 } else if (memcmp(cp, "max_addr=", 9) == 0) {
9d78f43d 422 max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
1da177e4
LT		 423 } else {
424 while (*cp != ' ' && *cp)
425 ++cp;
426 while (*cp == ' ')
427 ++cp;
428 }
429 }
430 if (max_addr != ~0UL)
431 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
432
433 efi.systab = __va(ia64_boot_param->efi_systab);
434
435 /*
436 * Verify the EFI Table
437 */
438 if (efi.systab == NULL)
439 panic("Woah! Can't find EFI system table.\n");
440 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
441 panic("Woah! EFI system table signature incorrect\n");
442 if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
443 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
444 "got %d.%02d, expected %d.%02d\n",
445 efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
446 EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
447
448 config_tables = __va(efi.systab->tables);
449
450 /* Show what we know for posterity */
451 c16 = __va(efi.systab->fw_vendor);
452 if (c16) {
ecdd5dab 453 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
1da177e4
LT		 454 vendor[i] = *c16++;
455 vendor[i] = '\0';
456 }
457
458 printk(KERN_INFO "EFI v%u.%.02u by %s:",
459 efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
460
b2c99e3c
BH		 461 efi.mps = EFI_INVALID_TABLE_ADDR;
462 efi.acpi = EFI_INVALID_TABLE_ADDR;
463 efi.acpi20 = EFI_INVALID_TABLE_ADDR;
464 efi.smbios = EFI_INVALID_TABLE_ADDR;
465 efi.sal_systab = EFI_INVALID_TABLE_ADDR;
466 efi.boot_info = EFI_INVALID_TABLE_ADDR;
467 efi.hcdp = EFI_INVALID_TABLE_ADDR;
468 efi.uga = EFI_INVALID_TABLE_ADDR;
469
1da177e4
LT		 470 for (i = 0; i < (int) efi.systab->nr_tables; i++) {
471 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
b2c99e3c 472 efi.mps = config_tables[i].table;
1da177e4
LT		 473 printk(" MPS=0x%lx", config_tables[i].table);
474 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
b2c99e3c 475 efi.acpi20 = config_tables[i].table;
1da177e4
LT		 476 printk(" ACPI 2.0=0x%lx", config_tables[i].table);
477 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
b2c99e3c 478 efi.acpi = config_tables[i].table;
1da177e4
LT		 479 printk(" ACPI=0x%lx", config_tables[i].table);
480 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
b2c99e3c 481 efi.smbios = config_tables[i].table;
1da177e4
LT		 482 printk(" SMBIOS=0x%lx", config_tables[i].table);
483 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
b2c99e3c 484 efi.sal_systab = config_tables[i].table;
1da177e4
LT		 485 printk(" SALsystab=0x%lx", config_tables[i].table);
486 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
b2c99e3c 487 efi.hcdp = config_tables[i].table;
1da177e4
LT		 488 printk(" HCDP=0x%lx", config_tables[i].table);
489 }
490 }
491 printk("\n");
492
493 runtime = __va(efi.systab->runtime);
494 efi.get_time = phys_get_time;
495 efi.set_time = phys_set_time;
496 efi.get_wakeup_time = phys_get_wakeup_time;
497 efi.set_wakeup_time = phys_set_wakeup_time;
498 efi.get_variable = phys_get_variable;
499 efi.get_next_variable = phys_get_next_variable;
500 efi.set_variable = phys_set_variable;
501 efi.get_next_high_mono_count = phys_get_next_high_mono_count;
502 efi.reset_system = phys_reset_system;
503
504 efi_map_start = __va(ia64_boot_param->efi_memmap);
505 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
506 efi_desc_size = ia64_boot_param->efi_memdesc_size;
507
508#if EFI_DEBUG
509 /* print EFI memory map: */
510 {
511 efi_memory_desc_t *md;
512 void *p;
513
514 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
515 md = p;
516 printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
517 i, md->type, md->attribute, md->phys_addr,
518 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
519 md->num_pages >> (20 - EFI_PAGE_SHIFT));
520 }
521 }
522#endif
523
524 efi_map_pal_code();
525 efi_enter_virtual_mode();
526}
527
528void
529efi_enter_virtual_mode (void)
530{
531 void *efi_map_start, *efi_map_end, *p;
532 efi_memory_desc_t *md;
533 efi_status_t status;
534 u64 efi_desc_size;
535
536 efi_map_start = __va(ia64_boot_param->efi_memmap);
537 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
538 efi_desc_size = ia64_boot_param->efi_memdesc_size;
539
540 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
541 md = p;
542 if (md->attribute & EFI_MEMORY_RUNTIME) {
543 /*
544 * Some descriptors have multiple bits set, so the order of
545 * the tests is relevant.
546 */
547 if (md->attribute & EFI_MEMORY_WB) {
548 md->virt_addr = (u64) __va(md->phys_addr);
549 } else if (md->attribute & EFI_MEMORY_UC) {
550 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
551 } else if (md->attribute & EFI_MEMORY_WC) {
552#if 0
553 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
554 | _PAGE_D
555 | _PAGE_MA_WC
556 | _PAGE_PL_0
557 | _PAGE_AR_RW));
558#else
559 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
560 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
561#endif
562 } else if (md->attribute & EFI_MEMORY_WT) {
563#if 0
564 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
565 | _PAGE_D | _PAGE_MA_WT
566 | _PAGE_PL_0
567 | _PAGE_AR_RW));
568#else
569 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
570 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
571#endif
572 }
573 }
574 }
575
576 status = efi_call_phys(__va(runtime->set_virtual_address_map),
577 ia64_boot_param->efi_memmap_size,
578 efi_desc_size, ia64_boot_param->efi_memdesc_version,
579 ia64_boot_param->efi_memmap);
580 if (status != EFI_SUCCESS) {
581 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
582 "(status=%lu)\n", status);
583 return;
584 }
585
586 /*
587 * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
588 */
589 efi.get_time = virt_get_time;
590 efi.set_time = virt_set_time;
591 efi.get_wakeup_time = virt_get_wakeup_time;
592 efi.set_wakeup_time = virt_set_wakeup_time;
593 efi.get_variable = virt_get_variable;
594 efi.get_next_variable = virt_get_next_variable;
595 efi.set_variable = virt_set_variable;
596 efi.get_next_high_mono_count = virt_get_next_high_mono_count;
597 efi.reset_system = virt_reset_system;
598}
599
600/*
601 * Walk the EFI memory map looking for the I/O port range. There can only be one entry of
602 * this type, other I/O port ranges should be described via ACPI.
603 */
604u64
605efi_get_iobase (void)
606{
607 void *efi_map_start, *efi_map_end, *p;
608 efi_memory_desc_t *md;
609 u64 efi_desc_size;
610
611 efi_map_start = __va(ia64_boot_param->efi_memmap);
612 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
613 efi_desc_size = ia64_boot_param->efi_memdesc_size;
614
615 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
616 md = p;
617 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
618 if (md->attribute & EFI_MEMORY_UC)
619 return md->phys_addr;
620 }
621 }
622 return 0;
623}
624
80851ef2
BH		 625static efi_memory_desc_t *
626efi_memory_descriptor (unsigned long phys_addr)
1da177e4
LT		 627{
628 void *efi_map_start, *efi_map_end, *p;
629 efi_memory_desc_t *md;
630 u64 efi_desc_size;
631
632 efi_map_start = __va(ia64_boot_param->efi_memmap);
633 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
634 efi_desc_size = ia64_boot_param->efi_memdesc_size;
635
636 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
637 md = p;
638
639 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
80851ef2 640 return md;
1da177e4
LT		 641 }
642 return 0;
643}
644
80851ef2
BH		 645static int
646efi_memmap_has_mmio (void)
1da177e4
LT		 647{
648 void *efi_map_start, *efi_map_end, *p;
649 efi_memory_desc_t *md;
650 u64 efi_desc_size;
651
652 efi_map_start = __va(ia64_boot_param->efi_memmap);
653 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
654 efi_desc_size = ia64_boot_param->efi_memdesc_size;
655
656 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
657 md = p;
658
80851ef2
BH		 659 if (md->type == EFI_MEMORY_MAPPED_IO)
660 return 1;
1da177e4
LT		 661 }
662 return 0;
663}
80851ef2
BH		 664
665u32
666efi_mem_type (unsigned long phys_addr)
667{
668 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
669
670 if (md)
671 return md->type;
672 return 0;
673}
674
675u64
676efi_mem_attributes (unsigned long phys_addr)
677{
678 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
679
680 if (md)
681 return md->attribute;
682 return 0;
683}
1da177e4
LT		 684EXPORT_SYMBOL(efi_mem_attributes);
685
80851ef2
BH		 686/*
687 * Determines whether the memory at phys_addr supports the desired
688 * attribute (WB, UC, etc). If this returns 1, the caller can safely
136939a2 689 * access size bytes at phys_addr with the specified attribute.
80851ef2 690 */
136939a2
BH		 691int
692efi_mem_attribute_range (unsigned long phys_addr, unsigned long size, u64 attr)
80851ef2 693{
136939a2 694 unsigned long end = phys_addr + size;
80851ef2 695 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
80851ef2 696
136939a2
BH		 697 /*
698 * Some firmware doesn't report MMIO regions in the EFI memory
699 * map. The Intel BigSur (a.k.a. HP i2000) has this problem.
700 * On those platforms, we have to assume UC is valid everywhere.
701 */
702 if (!md || (md->attribute & attr) != attr) {
703 if (attr == EFI_MEMORY_UC && !efi_memmap_has_mmio())
704 return 1;
80851ef2 705 return 0;
136939a2 706 }
80851ef2
BH		 707
708 do {
136939a2
BH		 709 unsigned long md_end = efi_md_end(md);
710
711 if (end <= md_end)
80851ef2
BH		 712 return 1;
713
714 md = efi_memory_descriptor(md_end);
136939a2
BH		 715 if (!md || (md->attribute & attr) != attr)
716 return 0;
80851ef2
BH		 717 } while (md);
718 return 0;
719}
720
721/*
722 * For /dev/mem, we only allow read & write system calls to access
723 * write-back memory, because read & write don't allow the user to
724 * control access size.
725 */
1da177e4 726int
136939a2 727valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
1da177e4 728{
80851ef2
BH		 729 return efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB);
730}
1da177e4 731
80851ef2
BH		 732/*
733 * We allow mmap of anything in the EFI memory map that supports
734 * either write-back or uncacheable access. For uncacheable regions,
735 * the supported access sizes are system-dependent, and the user is
736 * responsible for using the correct size.
737 *
738 * Note that this doesn't currently allow access to hot-added memory,
739 * because that doesn't appear in the boot-time EFI memory map.
740 */
741int
136939a2 742valid_mmap_phys_addr_range (unsigned long phys_addr, unsigned long size)
80851ef2
BH		 743{
744 if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB))
745 return 1;
1da177e4 746
80851ef2
BH		 747 if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_UC))
748 return 1;
1da177e4 749
1da177e4
LT		 750 return 0;
751}
752
753int __init
754efi_uart_console_only(void)
755{
756 efi_status_t status;
757 char *s, name[] = "ConOut";
758 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
759 efi_char16_t *utf16, name_utf16[32];
760 unsigned char data[1024];
761 unsigned long size = sizeof(data);
762 struct efi_generic_dev_path *hdr, *end_addr;
763 int uart = 0;
764
765 /* Convert to UTF-16 */
766 utf16 = name_utf16;
767 s = name;
768 while (*s)
769 *utf16++ = *s++ & 0x7f;
770 *utf16 = 0;
771
772 status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
773 if (status != EFI_SUCCESS) {
774 printk(KERN_ERR "No EFI %s variable?\n", name);
775 return 0;
776 }
777
778 hdr = (struct efi_generic_dev_path *) data;
779 end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
780 while (hdr < end_addr) {
781 if (hdr->type == EFI_DEV_MSG &&
782 hdr->sub_type == EFI_DEV_MSG_UART)
783 uart = 1;
784 else if (hdr->type == EFI_DEV_END_PATH ||
785 hdr->type == EFI_DEV_END_PATH2) {
786 if (!uart)
787 return 0;
788 if (hdr->sub_type == EFI_DEV_END_ENTIRE)
789 return 1;
790 uart = 0;
791 }
792 hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
793 }
794 printk(KERN_ERR "Malformed %s value\n", name);
795 return 0;
796}
d8c97d5f 797
d8c97d5f
TL		 798/*
799 * Look for the first granule aligned memory descriptor memory
800 * that is big enough to hold EFI memory map. Make sure this
801 * descriptor is atleast granule sized so it does not get trimmed
802 */
803struct kern_memdesc *
804find_memmap_space (void)
805{
806 u64 contig_low=0, contig_high=0;
807 u64 as = 0, ae;
808 void *efi_map_start, *efi_map_end, *p, *q;
809 efi_memory_desc_t *md, *pmd = NULL, *check_md;
810 u64 space_needed, efi_desc_size;
811 unsigned long total_mem = 0;
812
813 efi_map_start = __va(ia64_boot_param->efi_memmap);
814 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
815 efi_desc_size = ia64_boot_param->efi_memdesc_size;
816
817 /*
818 * Worst case: we need 3 kernel descriptors for each efi descriptor
819 * (if every entry has a WB part in the middle, and UC head and tail),
820 * plus one for the end marker.
821 */
822 space_needed = sizeof(kern_memdesc_t) *
823 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
824
825 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
826 md = p;
827 if (!efi_wb(md)) {
828 continue;
829 }
830 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
831 contig_low = GRANULEROUNDUP(md->phys_addr);
832 contig_high = efi_md_end(md);
833 for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
834 check_md = q;
835 if (!efi_wb(check_md))
836 break;
837 if (contig_high != check_md->phys_addr)
838 break;
839 contig_high = efi_md_end(check_md);
840 }
841 contig_high = GRANULEROUNDDOWN(contig_high);
842 }
843 if (!is_available_memory(md) || md->type == EFI_LOADER_DATA)
844 continue;
845
846 /* Round ends inward to granule boundaries */
847 as = max(contig_low, md->phys_addr);
848 ae = min(contig_high, efi_md_end(md));
849
850 /* keep within max_addr= command line arg */
851 ae = min(ae, max_addr);
852 if (ae <= as)
853 continue;
854
855 /* avoid going over mem= command line arg */
856 if (total_mem + (ae - as) > mem_limit)
857 ae -= total_mem + (ae - as) - mem_limit;
858
859 if (ae <= as)
860 continue;
861
862 if (ae - as > space_needed)
863 break;
864 }
865 if (p >= efi_map_end)
866 panic("Can't allocate space for kernel memory descriptors");
867
868 return __va(as);
869}
870
871/*
872 * Walk the EFI memory map and gather all memory available for kernel
873 * to use. We can allocate partial granules only if the unavailable
874 * parts exist, and are WB.
875 */
876void
877efi_memmap_init(unsigned long *s, unsigned long *e)
878{
879 struct kern_memdesc *k, *prev = 0;
880 u64 contig_low=0, contig_high=0;
881 u64 as, ae, lim;
882 void *efi_map_start, *efi_map_end, *p, *q;
883 efi_memory_desc_t *md, *pmd = NULL, *check_md;
884 u64 efi_desc_size;
885 unsigned long total_mem = 0;
886
887 k = kern_memmap = find_memmap_space();
888
889 efi_map_start = __va(ia64_boot_param->efi_memmap);
890 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
891 efi_desc_size = ia64_boot_param->efi_memdesc_size;
892
893 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
894 md = p;
895 if (!efi_wb(md)) {
896 if (efi_uc(md) && (md->type == EFI_CONVENTIONAL_MEMORY ||
897 md->type == EFI_BOOT_SERVICES_DATA)) {
898 k->attribute = EFI_MEMORY_UC;
899 k->start = md->phys_addr;
900 k->num_pages = md->num_pages;
901 k++;
902 }
903 continue;
904 }
905 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
906 contig_low = GRANULEROUNDUP(md->phys_addr);
907 contig_high = efi_md_end(md);
908 for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
909 check_md = q;
910 if (!efi_wb(check_md))
911 break;
912 if (contig_high != check_md->phys_addr)
913 break;
914 contig_high = efi_md_end(check_md);
915 }
916 contig_high = GRANULEROUNDDOWN(contig_high);
917 }
918 if (!is_available_memory(md))
919 continue;
920
921 /*
922 * Round ends inward to granule boundaries
923 * Give trimmings to uncached allocator
924 */
925 if (md->phys_addr < contig_low) {
926 lim = min(efi_md_end(md), contig_low);
927 if (efi_uc(md)) {
928 if (k > kern_memmap && (k-1)->attribute == EFI_MEMORY_UC &&
929 kmd_end(k-1) == md->phys_addr) {
930 (k-1)->num_pages += (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
931 } else {
932 k->attribute = EFI_MEMORY_UC;
933 k->start = md->phys_addr;
934 k->num_pages = (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
935 k++;
936 }
937 }
938 as = contig_low;
939 } else
940 as = md->phys_addr;
941
942 if (efi_md_end(md) > contig_high) {
943 lim = max(md->phys_addr, contig_high);
944 if (efi_uc(md)) {
945 if (lim == md->phys_addr && k > kern_memmap &&
946 (k-1)->attribute == EFI_MEMORY_UC &&
947 kmd_end(k-1) == md->phys_addr) {
948 (k-1)->num_pages += md->num_pages;
949 } else {
950 k->attribute = EFI_MEMORY_UC;
951 k->start = lim;
952 k->num_pages = (efi_md_end(md) - lim) >> EFI_PAGE_SHIFT;
953 k++;
954 }
955 }
956 ae = contig_high;
957 } else
958 ae = efi_md_end(md);
959
960 /* keep within max_addr= command line arg */
961 ae = min(ae, max_addr);
962 if (ae <= as)
963 continue;
964
965 /* avoid going over mem= command line arg */
966 if (total_mem + (ae - as) > mem_limit)
967 ae -= total_mem + (ae - as) - mem_limit;
968
969 if (ae <= as)
970 continue;
971 if (prev && kmd_end(prev) == md->phys_addr) {
972 prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
973 total_mem += ae - as;
974 continue;
975 }
976 k->attribute = EFI_MEMORY_WB;
977 k->start = as;
978 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
979 total_mem += ae - as;
980 prev = k++;
981 }
982 k->start = ~0L; /* end-marker */
983
984 /* reserve the memory we are using for kern_memmap */
985 *s = (u64)kern_memmap;
986 *e = (u64)++k;
987}
be379124
KA		 988
989void
990efi_initialize_iomem_resources(struct resource *code_resource,
991 struct resource *data_resource)
992{
993 struct resource *res;
994 void *efi_map_start, *efi_map_end, *p;
995 efi_memory_desc_t *md;
996 u64 efi_desc_size;
997 char *name;
998 unsigned long flags;
999
1000 efi_map_start = __va(ia64_boot_param->efi_memmap);
1001 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1002 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1003
1004 res = NULL;
1005
1006 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1007 md = p;
1008
1009 if (md->num_pages == 0) /* should not happen */
1010 continue;
1011
1012 flags = IORESOURCE_MEM;
1013 switch (md->type) {
1014
1015 case EFI_MEMORY_MAPPED_IO:
1016 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1017 continue;
1018
1019 case EFI_LOADER_CODE:
1020 case EFI_LOADER_DATA:
1021 case EFI_BOOT_SERVICES_DATA:
1022 case EFI_BOOT_SERVICES_CODE:
1023 case EFI_CONVENTIONAL_MEMORY:
1024 if (md->attribute & EFI_MEMORY_WP) {
1025 name = "System ROM";
1026 flags |= IORESOURCE_READONLY;
1027 } else {
1028 name = "System RAM";
1029 }
1030 break;
1031
1032 case EFI_ACPI_MEMORY_NVS:
1033 name = "ACPI Non-volatile Storage";
1034 flags |= IORESOURCE_BUSY;
1035 break;
1036
1037 case EFI_UNUSABLE_MEMORY:
1038 name = "reserved";
1039 flags |= IORESOURCE_BUSY | IORESOURCE_DISABLED;
1040 break;
1041
1042 case EFI_RESERVED_TYPE:
1043 case EFI_RUNTIME_SERVICES_CODE:
1044 case EFI_RUNTIME_SERVICES_DATA:
1045 case EFI_ACPI_RECLAIM_MEMORY:
1046 default:
1047 name = "reserved";
1048 flags |= IORESOURCE_BUSY;
1049 break;
1050 }
1051
baf47fb6 1052 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
be379124
KA		 1053 printk(KERN_ERR "failed to alocate resource for iomem\n");
1054 return;
1055 }
1056
1057 res->name = name;
1058 res->start = md->phys_addr;
1059 res->end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
1060 res->flags = flags;
1061
1062 if (insert_resource(&iomem_resource, res) < 0)
1063 kfree(res);
1064 else {
1065 /*
1066 * We don't know which region contains
1067 * kernel data so we try it repeatedly and
1068 * let the resource manager test it.
1069 */
1070 insert_resource(res, code_resource);
1071 insert_resource(res, data_resource);
1072 }
1073 }
1074}
Linux 6.x block layer and io_uring tree(s)