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