2 * Extensible Firmware Interface
4 * Based on Extensible Firmware Interface Specification version 0.9 April 30, 1999
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 * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
12 * Bjorn Helgaas <bjorn.helgaas@hp.com>
14 * All EFI Runtime Services are not implemented yet as EFI only
15 * supports physical mode addressing on SoftSDV. This is to be fixed
16 * in a future version. --drummond 1999-07-20
18 * Implemented EFI runtime services and virtual mode calls. --davidm
20 * Goutham Rao: <goutham.rao@intel.com>
21 * Skip non-WB memory and ignore empty memory ranges.
23 #include <linux/module.h>
24 #include <linux/bootmem.h>
25 #include <linux/kernel.h>
26 #include <linux/init.h>
27 #include <linux/types.h>
28 #include <linux/time.h>
29 #include <linux/efi.h>
30 #include <linux/kexec.h>
34 #include <asm/kregs.h>
35 #include <asm/meminit.h>
36 #include <asm/pgtable.h>
37 #include <asm/processor.h>
42 extern efi_status_t
efi_call_phys (void *, ...);
46 static efi_runtime_services_t
*runtime
;
47 static unsigned long mem_limit
= ~0UL, max_addr
= ~0UL, min_addr
= 0UL;
49 #define efi_call_virt(f, args...) (*(f))(args)
51 #define STUB_GET_TIME(prefix, adjust_arg) \
53 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \
55 struct ia64_fpreg fr[6]; \
56 efi_time_cap_t *atc = NULL; \
60 atc = adjust_arg(tc); \
61 ia64_save_scratch_fpregs(fr); \
62 ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm), atc); \
63 ia64_load_scratch_fpregs(fr); \
67 #define STUB_SET_TIME(prefix, adjust_arg) \
69 prefix##_set_time (efi_time_t *tm) \
71 struct ia64_fpreg fr[6]; \
74 ia64_save_scratch_fpregs(fr); \
75 ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), adjust_arg(tm)); \
76 ia64_load_scratch_fpregs(fr); \
80 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \
82 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm) \
84 struct ia64_fpreg fr[6]; \
87 ia64_save_scratch_fpregs(fr); \
88 ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time), \
89 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm)); \
90 ia64_load_scratch_fpregs(fr); \
94 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \
96 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \
98 struct ia64_fpreg fr[6]; \
99 efi_time_t *atm = NULL; \
103 atm = adjust_arg(tm); \
104 ia64_save_scratch_fpregs(fr); \
105 ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time), \
107 ia64_load_scratch_fpregs(fr); \
111 #define STUB_GET_VARIABLE(prefix, adjust_arg) \
112 static efi_status_t \
113 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \
114 unsigned long *data_size, void *data) \
116 struct ia64_fpreg fr[6]; \
121 aattr = adjust_arg(attr); \
122 ia64_save_scratch_fpregs(fr); \
123 ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable), \
124 adjust_arg(name), adjust_arg(vendor), aattr, \
125 adjust_arg(data_size), adjust_arg(data)); \
126 ia64_load_scratch_fpregs(fr); \
130 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \
131 static efi_status_t \
132 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor) \
134 struct ia64_fpreg fr[6]; \
137 ia64_save_scratch_fpregs(fr); \
138 ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable), \
139 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor)); \
140 ia64_load_scratch_fpregs(fr); \
144 #define STUB_SET_VARIABLE(prefix, adjust_arg) \
145 static efi_status_t \
146 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, unsigned long attr, \
147 unsigned long data_size, void *data) \
149 struct ia64_fpreg fr[6]; \
152 ia64_save_scratch_fpregs(fr); \
153 ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable), \
154 adjust_arg(name), adjust_arg(vendor), attr, data_size, \
156 ia64_load_scratch_fpregs(fr); \
160 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \
161 static efi_status_t \
162 prefix##_get_next_high_mono_count (u32 *count) \
164 struct ia64_fpreg fr[6]; \
167 ia64_save_scratch_fpregs(fr); \
168 ret = efi_call_##prefix((efi_get_next_high_mono_count_t *) \
169 __va(runtime->get_next_high_mono_count), adjust_arg(count)); \
170 ia64_load_scratch_fpregs(fr); \
174 #define STUB_RESET_SYSTEM(prefix, adjust_arg) \
176 prefix##_reset_system (int reset_type, efi_status_t status, \
177 unsigned long data_size, efi_char16_t *data) \
179 struct ia64_fpreg fr[6]; \
180 efi_char16_t *adata = NULL; \
183 adata = adjust_arg(data); \
185 ia64_save_scratch_fpregs(fr); \
186 efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system), \
187 reset_type, status, data_size, adata); \
188 /* should not return, but just in case... */ \
189 ia64_load_scratch_fpregs(fr); \
192 #define phys_ptr(arg) ((__typeof__(arg)) ia64_tpa(arg))
194 STUB_GET_TIME(phys
, phys_ptr
)
195 STUB_SET_TIME(phys
, phys_ptr
)
196 STUB_GET_WAKEUP_TIME(phys
, phys_ptr
)
197 STUB_SET_WAKEUP_TIME(phys
, phys_ptr
)
198 STUB_GET_VARIABLE(phys
, phys_ptr
)
199 STUB_GET_NEXT_VARIABLE(phys
, phys_ptr
)
200 STUB_SET_VARIABLE(phys
, phys_ptr
)
201 STUB_GET_NEXT_HIGH_MONO_COUNT(phys
, phys_ptr
)
202 STUB_RESET_SYSTEM(phys
, phys_ptr
)
206 STUB_GET_TIME(virt
, id
)
207 STUB_SET_TIME(virt
, id
)
208 STUB_GET_WAKEUP_TIME(virt
, id
)
209 STUB_SET_WAKEUP_TIME(virt
, id
)
210 STUB_GET_VARIABLE(virt
, id
)
211 STUB_GET_NEXT_VARIABLE(virt
, id
)
212 STUB_SET_VARIABLE(virt
, id
)
213 STUB_GET_NEXT_HIGH_MONO_COUNT(virt
, id
)
214 STUB_RESET_SYSTEM(virt
, id
)
217 efi_gettimeofday (struct timespec
*ts
)
221 if ((*efi
.get_time
)(&tm
, NULL
) != EFI_SUCCESS
) {
222 memset(ts
, 0, sizeof(*ts
));
226 ts
->tv_sec
= mktime(tm
.year
, tm
.month
, tm
.day
, tm
.hour
, tm
.minute
, tm
.second
);
227 ts
->tv_nsec
= tm
.nanosecond
;
231 is_memory_available (efi_memory_desc_t
*md
)
233 if (!(md
->attribute
& EFI_MEMORY_WB
))
237 case EFI_LOADER_CODE
:
238 case EFI_LOADER_DATA
:
239 case EFI_BOOT_SERVICES_CODE
:
240 case EFI_BOOT_SERVICES_DATA
:
241 case EFI_CONVENTIONAL_MEMORY
:
247 typedef struct kern_memdesc
{
253 static kern_memdesc_t
*kern_memmap
;
255 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
258 kmd_end(kern_memdesc_t
*kmd
)
260 return (kmd
->start
+ (kmd
->num_pages
<< EFI_PAGE_SHIFT
));
264 efi_md_end(efi_memory_desc_t
*md
)
266 return (md
->phys_addr
+ efi_md_size(md
));
270 efi_wb(efi_memory_desc_t
*md
)
272 return (md
->attribute
& EFI_MEMORY_WB
);
276 efi_uc(efi_memory_desc_t
*md
)
278 return (md
->attribute
& EFI_MEMORY_UC
);
282 walk (efi_freemem_callback_t callback
, void *arg
, u64 attr
)
285 u64 start
, end
, voff
;
287 voff
= (attr
== EFI_MEMORY_WB
) ? PAGE_OFFSET
: __IA64_UNCACHED_OFFSET
;
288 for (k
= kern_memmap
; k
->start
!= ~0UL; k
++) {
289 if (k
->attribute
!= attr
)
291 start
= PAGE_ALIGN(k
->start
);
292 end
= (k
->start
+ (k
->num_pages
<< EFI_PAGE_SHIFT
)) & PAGE_MASK
;
294 if ((*callback
)(start
+ voff
, end
+ voff
, arg
) < 0)
300 * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
301 * has memory that is available for OS use.
304 efi_memmap_walk (efi_freemem_callback_t callback
, void *arg
)
306 walk(callback
, arg
, EFI_MEMORY_WB
);
310 * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
311 * has memory that is available for uncached allocator.
314 efi_memmap_walk_uc (efi_freemem_callback_t callback
, void *arg
)
316 walk(callback
, arg
, EFI_MEMORY_UC
);
320 * Look for the PAL_CODE region reported by EFI and maps it using an
321 * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor
322 * Abstraction Layer chapter 11 in ADAG
326 efi_get_pal_addr (void)
328 void *efi_map_start
, *efi_map_end
, *p
;
329 efi_memory_desc_t
*md
;
331 int pal_code_count
= 0;
334 efi_map_start
= __va(ia64_boot_param
->efi_memmap
);
335 efi_map_end
= efi_map_start
+ ia64_boot_param
->efi_memmap_size
;
336 efi_desc_size
= ia64_boot_param
->efi_memdesc_size
;
338 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
340 if (md
->type
!= EFI_PAL_CODE
)
343 if (++pal_code_count
> 1) {
344 printk(KERN_ERR
"Too many EFI Pal Code memory ranges, dropped @ %lx\n",
349 * The only ITLB entry in region 7 that is used is the one installed by
350 * __start(). That entry covers a 64MB range.
352 mask
= ~((1 << KERNEL_TR_PAGE_SHIFT
) - 1);
353 vaddr
= PAGE_OFFSET
+ md
->phys_addr
;
356 * We must check that the PAL mapping won't overlap with the kernel
359 * PAL code is guaranteed to be aligned on a power of 2 between 4k and
360 * 256KB and that only one ITR is needed to map it. This implies that the
361 * PAL code is always aligned on its size, i.e., the closest matching page
362 * size supported by the TLB. Therefore PAL code is guaranteed never to
363 * cross a 64MB unless it is bigger than 64MB (very unlikely!). So for
364 * now the following test is enough to determine whether or not we need a
365 * dedicated ITR for the PAL code.
367 if ((vaddr
& mask
) == (KERNEL_START
& mask
)) {
368 printk(KERN_INFO
"%s: no need to install ITR for PAL code\n",
373 if (md
->num_pages
<< EFI_PAGE_SHIFT
> IA64_GRANULE_SIZE
)
374 panic("Woah! PAL code size bigger than a granule!");
377 mask
= ~((1 << IA64_GRANULE_SHIFT
) - 1);
379 printk(KERN_INFO
"CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
380 smp_processor_id(), md
->phys_addr
,
381 md
->phys_addr
+ (md
->num_pages
<< EFI_PAGE_SHIFT
),
382 vaddr
& mask
, (vaddr
& mask
) + IA64_GRANULE_SIZE
);
384 return __va(md
->phys_addr
);
386 printk(KERN_WARNING
"%s: no PAL-code memory-descriptor found\n",
392 efi_map_pal_code (void)
394 void *pal_vaddr
= efi_get_pal_addr ();
401 * Cannot write to CRx with PSR.ic=1
403 psr
= ia64_clear_ic();
404 ia64_itr(0x1, IA64_TR_PALCODE
, GRANULEROUNDDOWN((unsigned long) pal_vaddr
),
405 pte_val(pfn_pte(__pa(pal_vaddr
) >> PAGE_SHIFT
, PAGE_KERNEL
)),
407 ia64_set_psr(psr
); /* restore psr */
414 void *efi_map_start
, *efi_map_end
;
415 efi_config_table_t
*config_tables
;
418 char *cp
, vendor
[100] = "unknown";
421 /* it's too early to be able to use the standard kernel command line support... */
422 for (cp
= boot_command_line
; *cp
; ) {
423 if (memcmp(cp
, "mem=", 4) == 0) {
424 mem_limit
= memparse(cp
+ 4, &cp
);
425 } else if (memcmp(cp
, "max_addr=", 9) == 0) {
426 max_addr
= GRANULEROUNDDOWN(memparse(cp
+ 9, &cp
));
427 } else if (memcmp(cp
, "min_addr=", 9) == 0) {
428 min_addr
= GRANULEROUNDDOWN(memparse(cp
+ 9, &cp
));
430 while (*cp
!= ' ' && *cp
)
437 printk(KERN_INFO
"Ignoring memory below %luMB\n", min_addr
>> 20);
438 if (max_addr
!= ~0UL)
439 printk(KERN_INFO
"Ignoring memory above %luMB\n", max_addr
>> 20);
441 efi
.systab
= __va(ia64_boot_param
->efi_systab
);
444 * Verify the EFI Table
446 if (efi
.systab
== NULL
)
447 panic("Woah! Can't find EFI system table.\n");
448 if (efi
.systab
->hdr
.signature
!= EFI_SYSTEM_TABLE_SIGNATURE
)
449 panic("Woah! EFI system table signature incorrect\n");
450 if ((efi
.systab
->hdr
.revision
>> 16) == 0)
451 printk(KERN_WARNING
"Warning: EFI system table version "
452 "%d.%02d, expected 1.00 or greater\n",
453 efi
.systab
->hdr
.revision
>> 16,
454 efi
.systab
->hdr
.revision
& 0xffff);
456 config_tables
= __va(efi
.systab
->tables
);
458 /* Show what we know for posterity */
459 c16
= __va(efi
.systab
->fw_vendor
);
461 for (i
= 0;i
< (int) sizeof(vendor
) - 1 && *c16
; ++i
)
466 printk(KERN_INFO
"EFI v%u.%.02u by %s:",
467 efi
.systab
->hdr
.revision
>> 16, efi
.systab
->hdr
.revision
& 0xffff, vendor
);
469 efi
.mps
= EFI_INVALID_TABLE_ADDR
;
470 efi
.acpi
= EFI_INVALID_TABLE_ADDR
;
471 efi
.acpi20
= EFI_INVALID_TABLE_ADDR
;
472 efi
.smbios
= EFI_INVALID_TABLE_ADDR
;
473 efi
.sal_systab
= EFI_INVALID_TABLE_ADDR
;
474 efi
.boot_info
= EFI_INVALID_TABLE_ADDR
;
475 efi
.hcdp
= EFI_INVALID_TABLE_ADDR
;
476 efi
.uga
= EFI_INVALID_TABLE_ADDR
;
478 for (i
= 0; i
< (int) efi
.systab
->nr_tables
; i
++) {
479 if (efi_guidcmp(config_tables
[i
].guid
, MPS_TABLE_GUID
) == 0) {
480 efi
.mps
= config_tables
[i
].table
;
481 printk(" MPS=0x%lx", config_tables
[i
].table
);
482 } else if (efi_guidcmp(config_tables
[i
].guid
, ACPI_20_TABLE_GUID
) == 0) {
483 efi
.acpi20
= config_tables
[i
].table
;
484 printk(" ACPI 2.0=0x%lx", config_tables
[i
].table
);
485 } else if (efi_guidcmp(config_tables
[i
].guid
, ACPI_TABLE_GUID
) == 0) {
486 efi
.acpi
= config_tables
[i
].table
;
487 printk(" ACPI=0x%lx", config_tables
[i
].table
);
488 } else if (efi_guidcmp(config_tables
[i
].guid
, SMBIOS_TABLE_GUID
) == 0) {
489 efi
.smbios
= config_tables
[i
].table
;
490 printk(" SMBIOS=0x%lx", config_tables
[i
].table
);
491 } else if (efi_guidcmp(config_tables
[i
].guid
, SAL_SYSTEM_TABLE_GUID
) == 0) {
492 efi
.sal_systab
= config_tables
[i
].table
;
493 printk(" SALsystab=0x%lx", config_tables
[i
].table
);
494 } else if (efi_guidcmp(config_tables
[i
].guid
, HCDP_TABLE_GUID
) == 0) {
495 efi
.hcdp
= config_tables
[i
].table
;
496 printk(" HCDP=0x%lx", config_tables
[i
].table
);
501 runtime
= __va(efi
.systab
->runtime
);
502 efi
.get_time
= phys_get_time
;
503 efi
.set_time
= phys_set_time
;
504 efi
.get_wakeup_time
= phys_get_wakeup_time
;
505 efi
.set_wakeup_time
= phys_set_wakeup_time
;
506 efi
.get_variable
= phys_get_variable
;
507 efi
.get_next_variable
= phys_get_next_variable
;
508 efi
.set_variable
= phys_set_variable
;
509 efi
.get_next_high_mono_count
= phys_get_next_high_mono_count
;
510 efi
.reset_system
= phys_reset_system
;
512 efi_map_start
= __va(ia64_boot_param
->efi_memmap
);
513 efi_map_end
= efi_map_start
+ ia64_boot_param
->efi_memmap_size
;
514 efi_desc_size
= ia64_boot_param
->efi_memdesc_size
;
517 /* print EFI memory map: */
519 efi_memory_desc_t
*md
;
522 for (i
= 0, p
= efi_map_start
; p
< efi_map_end
; ++i
, p
+= efi_desc_size
) {
524 printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
525 i
, md
->type
, md
->attribute
, md
->phys_addr
,
526 md
->phys_addr
+ (md
->num_pages
<< EFI_PAGE_SHIFT
),
527 md
->num_pages
>> (20 - EFI_PAGE_SHIFT
));
533 efi_enter_virtual_mode();
537 efi_enter_virtual_mode (void)
539 void *efi_map_start
, *efi_map_end
, *p
;
540 efi_memory_desc_t
*md
;
544 efi_map_start
= __va(ia64_boot_param
->efi_memmap
);
545 efi_map_end
= efi_map_start
+ ia64_boot_param
->efi_memmap_size
;
546 efi_desc_size
= ia64_boot_param
->efi_memdesc_size
;
548 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
550 if (md
->attribute
& EFI_MEMORY_RUNTIME
) {
552 * Some descriptors have multiple bits set, so the order of
553 * the tests is relevant.
555 if (md
->attribute
& EFI_MEMORY_WB
) {
556 md
->virt_addr
= (u64
) __va(md
->phys_addr
);
557 } else if (md
->attribute
& EFI_MEMORY_UC
) {
558 md
->virt_addr
= (u64
) ioremap(md
->phys_addr
, 0);
559 } else if (md
->attribute
& EFI_MEMORY_WC
) {
561 md
->virt_addr
= ia64_remap(md
->phys_addr
, (_PAGE_A
| _PAGE_P
567 printk(KERN_INFO
"EFI_MEMORY_WC mapping\n");
568 md
->virt_addr
= (u64
) ioremap(md
->phys_addr
, 0);
570 } else if (md
->attribute
& EFI_MEMORY_WT
) {
572 md
->virt_addr
= ia64_remap(md
->phys_addr
, (_PAGE_A
| _PAGE_P
573 | _PAGE_D
| _PAGE_MA_WT
577 printk(KERN_INFO
"EFI_MEMORY_WT mapping\n");
578 md
->virt_addr
= (u64
) ioremap(md
->phys_addr
, 0);
584 status
= efi_call_phys(__va(runtime
->set_virtual_address_map
),
585 ia64_boot_param
->efi_memmap_size
,
586 efi_desc_size
, ia64_boot_param
->efi_memdesc_version
,
587 ia64_boot_param
->efi_memmap
);
588 if (status
!= EFI_SUCCESS
) {
589 printk(KERN_WARNING
"warning: unable to switch EFI into virtual mode "
590 "(status=%lu)\n", status
);
595 * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
597 efi
.get_time
= virt_get_time
;
598 efi
.set_time
= virt_set_time
;
599 efi
.get_wakeup_time
= virt_get_wakeup_time
;
600 efi
.set_wakeup_time
= virt_set_wakeup_time
;
601 efi
.get_variable
= virt_get_variable
;
602 efi
.get_next_variable
= virt_get_next_variable
;
603 efi
.set_variable
= virt_set_variable
;
604 efi
.get_next_high_mono_count
= virt_get_next_high_mono_count
;
605 efi
.reset_system
= virt_reset_system
;
609 * Walk the EFI memory map looking for the I/O port range. There can only be one entry of
610 * this type, other I/O port ranges should be described via ACPI.
613 efi_get_iobase (void)
615 void *efi_map_start
, *efi_map_end
, *p
;
616 efi_memory_desc_t
*md
;
619 efi_map_start
= __va(ia64_boot_param
->efi_memmap
);
620 efi_map_end
= efi_map_start
+ ia64_boot_param
->efi_memmap_size
;
621 efi_desc_size
= ia64_boot_param
->efi_memdesc_size
;
623 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
625 if (md
->type
== EFI_MEMORY_MAPPED_IO_PORT_SPACE
) {
626 if (md
->attribute
& EFI_MEMORY_UC
)
627 return md
->phys_addr
;
633 static struct kern_memdesc
*
634 kern_memory_descriptor (unsigned long phys_addr
)
636 struct kern_memdesc
*md
;
638 for (md
= kern_memmap
; md
->start
!= ~0UL; md
++) {
639 if (phys_addr
- md
->start
< (md
->num_pages
<< EFI_PAGE_SHIFT
))
645 static efi_memory_desc_t
*
646 efi_memory_descriptor (unsigned long phys_addr
)
648 void *efi_map_start
, *efi_map_end
, *p
;
649 efi_memory_desc_t
*md
;
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
;
656 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
659 if (phys_addr
- md
->phys_addr
< (md
->num_pages
<< EFI_PAGE_SHIFT
))
666 efi_memmap_intersects (unsigned long phys_addr
, unsigned long size
)
668 void *efi_map_start
, *efi_map_end
, *p
;
669 efi_memory_desc_t
*md
;
673 efi_map_start
= __va(ia64_boot_param
->efi_memmap
);
674 efi_map_end
= efi_map_start
+ ia64_boot_param
->efi_memmap_size
;
675 efi_desc_size
= ia64_boot_param
->efi_memdesc_size
;
677 end
= phys_addr
+ size
;
679 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
682 if (md
->phys_addr
< end
&& efi_md_end(md
) > phys_addr
)
689 efi_mem_type (unsigned long phys_addr
)
691 efi_memory_desc_t
*md
= efi_memory_descriptor(phys_addr
);
699 efi_mem_attributes (unsigned long phys_addr
)
701 efi_memory_desc_t
*md
= efi_memory_descriptor(phys_addr
);
704 return md
->attribute
;
707 EXPORT_SYMBOL(efi_mem_attributes
);
710 efi_mem_attribute (unsigned long phys_addr
, unsigned long size
)
712 unsigned long end
= phys_addr
+ size
;
713 efi_memory_desc_t
*md
= efi_memory_descriptor(phys_addr
);
720 * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
721 * the kernel that firmware needs this region mapped.
723 attr
= md
->attribute
& ~EFI_MEMORY_RUNTIME
;
725 unsigned long md_end
= efi_md_end(md
);
730 md
= efi_memory_descriptor(md_end
);
731 if (!md
|| (md
->attribute
& ~EFI_MEMORY_RUNTIME
) != attr
)
738 kern_mem_attribute (unsigned long phys_addr
, unsigned long size
)
740 unsigned long end
= phys_addr
+ size
;
741 struct kern_memdesc
*md
;
745 * This is a hack for ioremap calls before we set up kern_memmap.
746 * Maybe we should do efi_memmap_init() earlier instead.
749 attr
= efi_mem_attribute(phys_addr
, size
);
750 if (attr
& EFI_MEMORY_WB
)
751 return EFI_MEMORY_WB
;
755 md
= kern_memory_descriptor(phys_addr
);
759 attr
= md
->attribute
;
761 unsigned long md_end
= kmd_end(md
);
766 md
= kern_memory_descriptor(md_end
);
767 if (!md
|| md
->attribute
!= attr
)
772 EXPORT_SYMBOL(kern_mem_attribute
);
775 valid_phys_addr_range (unsigned long phys_addr
, unsigned long size
)
780 * /dev/mem reads and writes use copy_to_user(), which implicitly
781 * uses a granule-sized kernel identity mapping. It's really
782 * only safe to do this for regions in kern_memmap. For more
783 * details, see Documentation/ia64/aliasing.txt.
785 attr
= kern_mem_attribute(phys_addr
, size
);
786 if (attr
& EFI_MEMORY_WB
|| attr
& EFI_MEMORY_UC
)
792 valid_mmap_phys_addr_range (unsigned long pfn
, unsigned long size
)
794 unsigned long phys_addr
= pfn
<< PAGE_SHIFT
;
797 attr
= efi_mem_attribute(phys_addr
, size
);
800 * /dev/mem mmap uses normal user pages, so we don't need the entire
801 * granule, but the entire region we're mapping must support the same
804 if (attr
& EFI_MEMORY_WB
|| attr
& EFI_MEMORY_UC
)
808 * Intel firmware doesn't tell us about all the MMIO regions, so
809 * in general we have to allow mmap requests. But if EFI *does*
810 * tell us about anything inside this region, we should deny it.
811 * The user can always map a smaller region to avoid the overlap.
813 if (efi_memmap_intersects(phys_addr
, size
))
820 phys_mem_access_prot(struct file
*file
, unsigned long pfn
, unsigned long size
,
823 unsigned long phys_addr
= pfn
<< PAGE_SHIFT
;
827 * For /dev/mem mmap, we use user mappings, but if the region is
828 * in kern_memmap (and hence may be covered by a kernel mapping),
829 * we must use the same attribute as the kernel mapping.
831 attr
= kern_mem_attribute(phys_addr
, size
);
832 if (attr
& EFI_MEMORY_WB
)
833 return pgprot_cacheable(vma_prot
);
834 else if (attr
& EFI_MEMORY_UC
)
835 return pgprot_noncached(vma_prot
);
838 * Some chipsets don't support UC access to memory. If
839 * WB is supported, we prefer that.
841 if (efi_mem_attribute(phys_addr
, size
) & EFI_MEMORY_WB
)
842 return pgprot_cacheable(vma_prot
);
844 return pgprot_noncached(vma_prot
);
848 efi_uart_console_only(void)
851 char *s
, name
[] = "ConOut";
852 efi_guid_t guid
= EFI_GLOBAL_VARIABLE_GUID
;
853 efi_char16_t
*utf16
, name_utf16
[32];
854 unsigned char data
[1024];
855 unsigned long size
= sizeof(data
);
856 struct efi_generic_dev_path
*hdr
, *end_addr
;
859 /* Convert to UTF-16 */
863 *utf16
++ = *s
++ & 0x7f;
866 status
= efi
.get_variable(name_utf16
, &guid
, NULL
, &size
, data
);
867 if (status
!= EFI_SUCCESS
) {
868 printk(KERN_ERR
"No EFI %s variable?\n", name
);
872 hdr
= (struct efi_generic_dev_path
*) data
;
873 end_addr
= (struct efi_generic_dev_path
*) ((u8
*) data
+ size
);
874 while (hdr
< end_addr
) {
875 if (hdr
->type
== EFI_DEV_MSG
&&
876 hdr
->sub_type
== EFI_DEV_MSG_UART
)
878 else if (hdr
->type
== EFI_DEV_END_PATH
||
879 hdr
->type
== EFI_DEV_END_PATH2
) {
882 if (hdr
->sub_type
== EFI_DEV_END_ENTIRE
)
886 hdr
= (struct efi_generic_dev_path
*) ((u8
*) hdr
+ hdr
->length
);
888 printk(KERN_ERR
"Malformed %s value\n", name
);
893 * Look for the first granule aligned memory descriptor memory
894 * that is big enough to hold EFI memory map. Make sure this
895 * descriptor is atleast granule sized so it does not get trimmed
897 struct kern_memdesc
*
898 find_memmap_space (void)
900 u64 contig_low
=0, contig_high
=0;
902 void *efi_map_start
, *efi_map_end
, *p
, *q
;
903 efi_memory_desc_t
*md
, *pmd
= NULL
, *check_md
;
904 u64 space_needed
, efi_desc_size
;
905 unsigned long total_mem
= 0;
907 efi_map_start
= __va(ia64_boot_param
->efi_memmap
);
908 efi_map_end
= efi_map_start
+ ia64_boot_param
->efi_memmap_size
;
909 efi_desc_size
= ia64_boot_param
->efi_memdesc_size
;
912 * Worst case: we need 3 kernel descriptors for each efi descriptor
913 * (if every entry has a WB part in the middle, and UC head and tail),
914 * plus one for the end marker.
916 space_needed
= sizeof(kern_memdesc_t
) *
917 (3 * (ia64_boot_param
->efi_memmap_size
/efi_desc_size
) + 1);
919 for (p
= efi_map_start
; p
< efi_map_end
; pmd
= md
, p
+= efi_desc_size
) {
924 if (pmd
== NULL
|| !efi_wb(pmd
) || efi_md_end(pmd
) != md
->phys_addr
) {
925 contig_low
= GRANULEROUNDUP(md
->phys_addr
);
926 contig_high
= efi_md_end(md
);
927 for (q
= p
+ efi_desc_size
; q
< efi_map_end
; q
+= efi_desc_size
) {
929 if (!efi_wb(check_md
))
931 if (contig_high
!= check_md
->phys_addr
)
933 contig_high
= efi_md_end(check_md
);
935 contig_high
= GRANULEROUNDDOWN(contig_high
);
937 if (!is_memory_available(md
) || md
->type
== EFI_LOADER_DATA
)
940 /* Round ends inward to granule boundaries */
941 as
= max(contig_low
, md
->phys_addr
);
942 ae
= min(contig_high
, efi_md_end(md
));
944 /* keep within max_addr= and min_addr= command line arg */
945 as
= max(as
, min_addr
);
946 ae
= min(ae
, max_addr
);
950 /* avoid going over mem= command line arg */
951 if (total_mem
+ (ae
- as
) > mem_limit
)
952 ae
-= total_mem
+ (ae
- as
) - mem_limit
;
957 if (ae
- as
> space_needed
)
960 if (p
>= efi_map_end
)
961 panic("Can't allocate space for kernel memory descriptors");
967 * Walk the EFI memory map and gather all memory available for kernel
968 * to use. We can allocate partial granules only if the unavailable
969 * parts exist, and are WB.
972 efi_memmap_init(unsigned long *s
, unsigned long *e
)
974 struct kern_memdesc
*k
, *prev
= NULL
;
975 u64 contig_low
=0, contig_high
=0;
977 void *efi_map_start
, *efi_map_end
, *p
, *q
;
978 efi_memory_desc_t
*md
, *pmd
= NULL
, *check_md
;
980 unsigned long total_mem
= 0;
982 k
= kern_memmap
= find_memmap_space();
984 efi_map_start
= __va(ia64_boot_param
->efi_memmap
);
985 efi_map_end
= efi_map_start
+ ia64_boot_param
->efi_memmap_size
;
986 efi_desc_size
= ia64_boot_param
->efi_memdesc_size
;
988 for (p
= efi_map_start
; p
< efi_map_end
; pmd
= md
, p
+= efi_desc_size
) {
991 if (efi_uc(md
) && (md
->type
== EFI_CONVENTIONAL_MEMORY
||
992 md
->type
== EFI_BOOT_SERVICES_DATA
)) {
993 k
->attribute
= EFI_MEMORY_UC
;
994 k
->start
= md
->phys_addr
;
995 k
->num_pages
= md
->num_pages
;
1000 if (pmd
== NULL
|| !efi_wb(pmd
) || efi_md_end(pmd
) != md
->phys_addr
) {
1001 contig_low
= GRANULEROUNDUP(md
->phys_addr
);
1002 contig_high
= efi_md_end(md
);
1003 for (q
= p
+ efi_desc_size
; q
< efi_map_end
; q
+= efi_desc_size
) {
1005 if (!efi_wb(check_md
))
1007 if (contig_high
!= check_md
->phys_addr
)
1009 contig_high
= efi_md_end(check_md
);
1011 contig_high
= GRANULEROUNDDOWN(contig_high
);
1013 if (!is_memory_available(md
))
1016 #ifdef CONFIG_CRASH_DUMP
1017 /* saved_max_pfn should ignore max_addr= command line arg */
1018 if (saved_max_pfn
< (efi_md_end(md
) >> PAGE_SHIFT
))
1019 saved_max_pfn
= (efi_md_end(md
) >> PAGE_SHIFT
);
1022 * Round ends inward to granule boundaries
1023 * Give trimmings to uncached allocator
1025 if (md
->phys_addr
< contig_low
) {
1026 lim
= min(efi_md_end(md
), contig_low
);
1028 if (k
> kern_memmap
&& (k
-1)->attribute
== EFI_MEMORY_UC
&&
1029 kmd_end(k
-1) == md
->phys_addr
) {
1030 (k
-1)->num_pages
+= (lim
- md
->phys_addr
) >> EFI_PAGE_SHIFT
;
1032 k
->attribute
= EFI_MEMORY_UC
;
1033 k
->start
= md
->phys_addr
;
1034 k
->num_pages
= (lim
- md
->phys_addr
) >> EFI_PAGE_SHIFT
;
1042 if (efi_md_end(md
) > contig_high
) {
1043 lim
= max(md
->phys_addr
, contig_high
);
1045 if (lim
== md
->phys_addr
&& k
> kern_memmap
&&
1046 (k
-1)->attribute
== EFI_MEMORY_UC
&&
1047 kmd_end(k
-1) == md
->phys_addr
) {
1048 (k
-1)->num_pages
+= md
->num_pages
;
1050 k
->attribute
= EFI_MEMORY_UC
;
1052 k
->num_pages
= (efi_md_end(md
) - lim
) >> EFI_PAGE_SHIFT
;
1058 ae
= efi_md_end(md
);
1060 /* keep within max_addr= and min_addr= command line arg */
1061 as
= max(as
, min_addr
);
1062 ae
= min(ae
, max_addr
);
1066 /* avoid going over mem= command line arg */
1067 if (total_mem
+ (ae
- as
) > mem_limit
)
1068 ae
-= total_mem
+ (ae
- as
) - mem_limit
;
1072 if (prev
&& kmd_end(prev
) == md
->phys_addr
) {
1073 prev
->num_pages
+= (ae
- as
) >> EFI_PAGE_SHIFT
;
1074 total_mem
+= ae
- as
;
1077 k
->attribute
= EFI_MEMORY_WB
;
1079 k
->num_pages
= (ae
- as
) >> EFI_PAGE_SHIFT
;
1080 total_mem
+= ae
- as
;
1083 k
->start
= ~0L; /* end-marker */
1085 /* reserve the memory we are using for kern_memmap */
1086 *s
= (u64
)kern_memmap
;
1093 efi_initialize_iomem_resources(struct resource
*code_resource
,
1094 struct resource
*data_resource
,
1095 struct resource
*bss_resource
)
1097 struct resource
*res
;
1098 void *efi_map_start
, *efi_map_end
, *p
;
1099 efi_memory_desc_t
*md
;
1102 unsigned long flags
;
1104 efi_map_start
= __va(ia64_boot_param
->efi_memmap
);
1105 efi_map_end
= efi_map_start
+ ia64_boot_param
->efi_memmap_size
;
1106 efi_desc_size
= ia64_boot_param
->efi_memdesc_size
;
1110 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
1113 if (md
->num_pages
== 0) /* should not happen */
1116 flags
= IORESOURCE_MEM
;
1119 case EFI_MEMORY_MAPPED_IO
:
1120 case EFI_MEMORY_MAPPED_IO_PORT_SPACE
:
1123 case EFI_LOADER_CODE
:
1124 case EFI_LOADER_DATA
:
1125 case EFI_BOOT_SERVICES_DATA
:
1126 case EFI_BOOT_SERVICES_CODE
:
1127 case EFI_CONVENTIONAL_MEMORY
:
1128 if (md
->attribute
& EFI_MEMORY_WP
) {
1129 name
= "System ROM";
1130 flags
|= IORESOURCE_READONLY
;
1132 name
= "System RAM";
1136 case EFI_ACPI_MEMORY_NVS
:
1137 name
= "ACPI Non-volatile Storage";
1138 flags
|= IORESOURCE_BUSY
;
1141 case EFI_UNUSABLE_MEMORY
:
1143 flags
|= IORESOURCE_BUSY
| IORESOURCE_DISABLED
;
1146 case EFI_RESERVED_TYPE
:
1147 case EFI_RUNTIME_SERVICES_CODE
:
1148 case EFI_RUNTIME_SERVICES_DATA
:
1149 case EFI_ACPI_RECLAIM_MEMORY
:
1152 flags
|= IORESOURCE_BUSY
;
1156 if ((res
= kzalloc(sizeof(struct resource
), GFP_KERNEL
)) == NULL
) {
1157 printk(KERN_ERR
"failed to alocate resource for iomem\n");
1162 res
->start
= md
->phys_addr
;
1163 res
->end
= md
->phys_addr
+ (md
->num_pages
<< EFI_PAGE_SHIFT
) - 1;
1166 if (insert_resource(&iomem_resource
, res
) < 0)
1170 * We don't know which region contains
1171 * kernel data so we try it repeatedly and
1172 * let the resource manager test it.
1174 insert_resource(res
, code_resource
);
1175 insert_resource(res
, data_resource
);
1176 insert_resource(res
, bss_resource
);
1178 insert_resource(res
, &efi_memmap_res
);
1179 insert_resource(res
, &boot_param_res
);
1180 if (crashk_res
.end
> crashk_res
.start
)
1181 insert_resource(res
, &crashk_res
);
1188 /* find a block of memory aligned to 64M exclude reserved regions
1189 rsvd_regions are sorted
1191 unsigned long __init
1192 kdump_find_rsvd_region (unsigned long size
,
1193 struct rsvd_region
*r
, int n
)
1197 u64 alignment
= 1UL << _PAGE_SIZE_64M
;
1198 void *efi_map_start
, *efi_map_end
, *p
;
1199 efi_memory_desc_t
*md
;
1202 efi_map_start
= __va(ia64_boot_param
->efi_memmap
);
1203 efi_map_end
= efi_map_start
+ ia64_boot_param
->efi_memmap_size
;
1204 efi_desc_size
= ia64_boot_param
->efi_memdesc_size
;
1206 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
1210 start
= ALIGN(md
->phys_addr
, alignment
);
1211 end
= efi_md_end(md
);
1212 for (i
= 0; i
< n
; i
++) {
1213 if (__pa(r
[i
].start
) >= start
&& __pa(r
[i
].end
) < end
) {
1214 if (__pa(r
[i
].start
) > start
+ size
)
1216 start
= ALIGN(__pa(r
[i
].end
), alignment
);
1217 if (i
< n
-1 && __pa(r
[i
+1].start
) < start
+ size
)
1223 if (end
> start
+ size
)
1227 printk(KERN_WARNING
"Cannot reserve 0x%lx byte of memory for crashdump\n",
1233 #ifdef CONFIG_PROC_VMCORE
1234 /* locate the size find a the descriptor at a certain address */
1235 unsigned long __init
1236 vmcore_find_descriptor_size (unsigned long address
)
1238 void *efi_map_start
, *efi_map_end
, *p
;
1239 efi_memory_desc_t
*md
;
1241 unsigned long ret
= 0;
1243 efi_map_start
= __va(ia64_boot_param
->efi_memmap
);
1244 efi_map_end
= efi_map_start
+ ia64_boot_param
->efi_memmap_size
;
1245 efi_desc_size
= ia64_boot_param
->efi_memdesc_size
;
1247 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
1249 if (efi_wb(md
) && md
->type
== EFI_LOADER_DATA
1250 && md
->phys_addr
== address
) {
1251 ret
= efi_md_size(md
);
1257 printk(KERN_WARNING
"Cannot locate EFI vmcore descriptor\n");