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>
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
16 * Implemented EFI runtime services and virtual mode calls. --davidm
18 * Goutham Rao: <goutham.rao@intel.com>
19 * Skip non-WB memory and ignore empty memory ranges.
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>
30 #include <asm/kregs.h>
31 #include <asm/meminit.h>
32 #include <asm/pgtable.h>
33 #include <asm/processor.h>
38 extern efi_status_t
efi_call_phys (void *, ...);
42 static efi_runtime_services_t
*runtime
;
43 static unsigned long mem_limit
= ~0UL, max_addr
= ~0UL;
45 #define efi_call_virt(f, args...) (*(f))(args)
47 #define STUB_GET_TIME(prefix, adjust_arg) \
49 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \
51 struct ia64_fpreg fr[6]; \
52 efi_time_cap_t *atc = NULL; \
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); \
63 #define STUB_SET_TIME(prefix, adjust_arg) \
65 prefix##_set_time (efi_time_t *tm) \
67 struct ia64_fpreg fr[6]; \
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); \
76 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \
78 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm) \
80 struct ia64_fpreg fr[6]; \
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); \
90 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \
92 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \
94 struct ia64_fpreg fr[6]; \
95 efi_time_t *atm = NULL; \
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), \
103 ia64_load_scratch_fpregs(fr); \
107 #define STUB_GET_VARIABLE(prefix, adjust_arg) \
108 static efi_status_t \
109 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \
110 unsigned long *data_size, void *data) \
112 struct ia64_fpreg fr[6]; \
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); \
126 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \
127 static efi_status_t \
128 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor) \
130 struct ia64_fpreg fr[6]; \
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); \
140 #define STUB_SET_VARIABLE(prefix, adjust_arg) \
141 static efi_status_t \
142 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, unsigned long attr, \
143 unsigned long data_size, void *data) \
145 struct ia64_fpreg fr[6]; \
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, \
152 ia64_load_scratch_fpregs(fr); \
156 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \
157 static efi_status_t \
158 prefix##_get_next_high_mono_count (u32 *count) \
160 struct ia64_fpreg fr[6]; \
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); \
170 #define STUB_RESET_SYSTEM(prefix, adjust_arg) \
172 prefix##_reset_system (int reset_type, efi_status_t status, \
173 unsigned long data_size, efi_char16_t *data) \
175 struct ia64_fpreg fr[6]; \
176 efi_char16_t *adata = NULL; \
179 adata = adjust_arg(data); \
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); \
188 #define phys_ptr(arg) ((__typeof__(arg)) ia64_tpa(arg))
190 STUB_GET_TIME(phys
, phys_ptr
)
191 STUB_SET_TIME(phys
, phys_ptr
)
192 STUB_GET_WAKEUP_TIME(phys
, phys_ptr
)
193 STUB_SET_WAKEUP_TIME(phys
, phys_ptr
)
194 STUB_GET_VARIABLE(phys
, phys_ptr
)
195 STUB_GET_NEXT_VARIABLE(phys
, phys_ptr
)
196 STUB_SET_VARIABLE(phys
, phys_ptr
)
197 STUB_GET_NEXT_HIGH_MONO_COUNT(phys
, phys_ptr
)
198 STUB_RESET_SYSTEM(phys
, phys_ptr
)
202 STUB_GET_TIME(virt
, id
)
203 STUB_SET_TIME(virt
, id
)
204 STUB_GET_WAKEUP_TIME(virt
, id
)
205 STUB_SET_WAKEUP_TIME(virt
, id
)
206 STUB_GET_VARIABLE(virt
, id
)
207 STUB_GET_NEXT_VARIABLE(virt
, id
)
208 STUB_SET_VARIABLE(virt
, id
)
209 STUB_GET_NEXT_HIGH_MONO_COUNT(virt
, id
)
210 STUB_RESET_SYSTEM(virt
, id
)
213 efi_gettimeofday (struct timespec
*ts
)
217 memset(ts
, 0, sizeof(ts
));
218 if ((*efi
.get_time
)(&tm
, NULL
) != EFI_SUCCESS
)
221 ts
->tv_sec
= mktime(tm
.year
, tm
.month
, tm
.day
, tm
.hour
, tm
.minute
, tm
.second
);
222 ts
->tv_nsec
= tm
.nanosecond
;
226 is_available_memory (efi_memory_desc_t
*md
)
228 if (!(md
->attribute
& EFI_MEMORY_WB
))
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
:
242 typedef struct kern_memdesc
{
248 static kern_memdesc_t
*kern_memmap
;
251 walk (efi_freemem_callback_t callback
, void *arg
, u64 attr
)
254 u64 start
, end
, voff
;
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
)
260 start
= PAGE_ALIGN(k
->start
);
261 end
= (k
->start
+ (k
->num_pages
<< EFI_PAGE_SHIFT
)) & PAGE_MASK
;
263 if ((*callback
)(start
+ voff
, end
+ voff
, arg
) < 0)
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.
273 efi_memmap_walk (efi_freemem_callback_t callback
, void *arg
)
275 walk(callback
, arg
, EFI_MEMORY_WB
);
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.
283 efi_memmap_walk_uc (efi_freemem_callback_t callback
, void *arg
)
285 walk(callback
, arg
, EFI_MEMORY_UC
);
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
295 efi_get_pal_addr (void)
297 void *efi_map_start
, *efi_map_end
, *p
;
298 efi_memory_desc_t
*md
;
300 int pal_code_count
= 0;
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
;
307 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
309 if (md
->type
!= EFI_PAL_CODE
)
312 if (++pal_code_count
> 1) {
313 printk(KERN_ERR
"Too many EFI Pal Code memory ranges, dropped @ %lx\n",
318 * The only ITLB entry in region 7 that is used is the one installed by
319 * __start(). That entry covers a 64MB range.
321 mask
= ~((1 << KERNEL_TR_PAGE_SHIFT
) - 1);
322 vaddr
= PAGE_OFFSET
+ md
->phys_addr
;
325 * We must check that the PAL mapping won't overlap with the kernel
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.
336 if ((vaddr
& mask
) == (KERNEL_START
& mask
)) {
337 printk(KERN_INFO
"%s: no need to install ITR for PAL code\n",
342 if (md
->num_pages
<< EFI_PAGE_SHIFT
> IA64_GRANULE_SIZE
)
343 panic("Woah! PAL code size bigger than a granule!");
346 mask
= ~((1 << IA64_GRANULE_SHIFT
) - 1);
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
);
353 return __va(md
->phys_addr
);
355 printk(KERN_WARNING
"%s: no PAL-code memory-descriptor found",
361 efi_map_pal_code (void)
363 void *pal_vaddr
= efi_get_pal_addr ();
370 * Cannot write to CRx with PSR.ic=1
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
)),
376 ia64_set_psr(psr
); /* restore psr */
383 void *efi_map_start
, *efi_map_end
;
384 efi_config_table_t
*config_tables
;
387 char *cp
, *end
, vendor
[100] = "unknown";
388 extern char saved_command_line
[];
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) {
395 mem_limit
= memparse(cp
, &end
);
399 } else if (memcmp(cp
, "max_addr=", 9) == 0) {
401 max_addr
= GRANULEROUNDDOWN(memparse(cp
, &end
));
406 while (*cp
!= ' ' && *cp
)
412 if (max_addr
!= ~0UL)
413 printk(KERN_INFO
"Ignoring memory above %luMB\n", max_addr
>> 20);
415 efi
.systab
= __va(ia64_boot_param
->efi_systab
);
418 * Verify the EFI Table
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);
430 config_tables
= __va(efi
.systab
->tables
);
432 /* Show what we know for posterity */
433 c16
= __va(efi
.systab
->fw_vendor
);
435 for (i
= 0;i
< (int) sizeof(vendor
) && *c16
; ++i
)
440 printk(KERN_INFO
"EFI v%u.%.02u by %s:",
441 efi
.systab
->hdr
.revision
>> 16, efi
.systab
->hdr
.revision
& 0xffff, vendor
);
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
);
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
;
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
;
482 /* print EFI memory map: */
484 efi_memory_desc_t
*md
;
487 for (i
= 0, p
= efi_map_start
; p
< efi_map_end
; ++i
, p
+= efi_desc_size
) {
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
));
498 efi_enter_virtual_mode();
502 efi_enter_virtual_mode (void)
504 void *efi_map_start
, *efi_map_end
, *p
;
505 efi_memory_desc_t
*md
;
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
;
513 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
515 if (md
->attribute
& EFI_MEMORY_RUNTIME
) {
517 * Some descriptors have multiple bits set, so the order of
518 * the tests is relevant.
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
) {
526 md
->virt_addr
= ia64_remap(md
->phys_addr
, (_PAGE_A
| _PAGE_P
532 printk(KERN_INFO
"EFI_MEMORY_WC mapping\n");
533 md
->virt_addr
= (u64
) ioremap(md
->phys_addr
, 0);
535 } else if (md
->attribute
& EFI_MEMORY_WT
) {
537 md
->virt_addr
= ia64_remap(md
->phys_addr
, (_PAGE_A
| _PAGE_P
538 | _PAGE_D
| _PAGE_MA_WT
542 printk(KERN_INFO
"EFI_MEMORY_WT mapping\n");
543 md
->virt_addr
= (u64
) ioremap(md
->phys_addr
, 0);
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
);
560 * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
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
;
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.
578 efi_get_iobase (void)
580 void *efi_map_start
, *efi_map_end
, *p
;
581 efi_memory_desc_t
*md
;
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
;
588 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
590 if (md
->type
== EFI_MEMORY_MAPPED_IO_PORT_SPACE
) {
591 if (md
->attribute
& EFI_MEMORY_UC
)
592 return md
->phys_addr
;
599 efi_mem_type (unsigned long phys_addr
)
601 void *efi_map_start
, *efi_map_end
, *p
;
602 efi_memory_desc_t
*md
;
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
;
609 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
612 if (phys_addr
- md
->phys_addr
< (md
->num_pages
<< EFI_PAGE_SHIFT
))
619 efi_mem_attributes (unsigned long phys_addr
)
621 void *efi_map_start
, *efi_map_end
, *p
;
622 efi_memory_desc_t
*md
;
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
;
629 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
632 if (phys_addr
- md
->phys_addr
< (md
->num_pages
<< EFI_PAGE_SHIFT
))
633 return md
->attribute
;
637 EXPORT_SYMBOL(efi_mem_attributes
);
640 valid_phys_addr_range (unsigned long phys_addr
, unsigned long *size
)
642 void *efi_map_start
, *efi_map_end
, *p
;
643 efi_memory_desc_t
*md
;
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
;
650 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
653 if (phys_addr
- md
->phys_addr
< (md
->num_pages
<< EFI_PAGE_SHIFT
)) {
654 if (!(md
->attribute
& EFI_MEMORY_WB
))
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
;
666 efi_uart_console_only(void)
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
;
677 /* Convert to UTF-16 */
681 *utf16
++ = *s
++ & 0x7f;
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
);
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
)
696 else if (hdr
->type
== EFI_DEV_END_PATH
||
697 hdr
->type
== EFI_DEV_END_PATH2
) {
700 if (hdr
->sub_type
== EFI_DEV_END_ENTIRE
)
704 hdr
= (struct efi_generic_dev_path
*) ((u8
*) hdr
+ hdr
->length
);
706 printk(KERN_ERR
"Malformed %s value\n", name
);
710 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
713 kmd_end(kern_memdesc_t
*kmd
)
715 return (kmd
->start
+ (kmd
->num_pages
<< EFI_PAGE_SHIFT
));
719 efi_md_end(efi_memory_desc_t
*md
)
721 return (md
->phys_addr
+ efi_md_size(md
));
725 efi_wb(efi_memory_desc_t
*md
)
727 return (md
->attribute
& EFI_MEMORY_WB
);
731 efi_uc(efi_memory_desc_t
*md
)
733 return (md
->attribute
& EFI_MEMORY_UC
);
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
741 struct kern_memdesc
*
742 find_memmap_space (void)
744 u64 contig_low
=0, contig_high
=0;
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;
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
;
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.
760 space_needed
= sizeof(kern_memdesc_t
) *
761 (3 * (ia64_boot_param
->efi_memmap_size
/efi_desc_size
) + 1);
763 for (p
= efi_map_start
; p
< efi_map_end
; pmd
= md
, p
+= efi_desc_size
) {
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
) {
773 if (!efi_wb(check_md
))
775 if (contig_high
!= check_md
->phys_addr
)
777 contig_high
= efi_md_end(check_md
);
779 contig_high
= GRANULEROUNDDOWN(contig_high
);
781 if (!is_available_memory(md
) || md
->type
== EFI_LOADER_DATA
)
784 /* Round ends inward to granule boundaries */
785 as
= max(contig_low
, md
->phys_addr
);
786 ae
= min(contig_high
, efi_md_end(md
));
788 /* keep within max_addr= command line arg */
789 ae
= min(ae
, max_addr
);
793 /* avoid going over mem= command line arg */
794 if (total_mem
+ (ae
- as
) > mem_limit
)
795 ae
-= total_mem
+ (ae
- as
) - mem_limit
;
800 if (ae
- as
> space_needed
)
803 if (p
>= efi_map_end
)
804 panic("Can't allocate space for kernel memory descriptors");
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.
815 efi_memmap_init(unsigned long *s
, unsigned long *e
)
817 struct kern_memdesc
*k
, *prev
= 0;
818 u64 contig_low
=0, contig_high
=0;
820 void *efi_map_start
, *efi_map_end
, *p
, *q
;
821 efi_memory_desc_t
*md
, *pmd
= NULL
, *check_md
;
823 unsigned long total_mem
= 0;
825 k
= kern_memmap
= find_memmap_space();
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
;
831 for (p
= efi_map_start
; p
< efi_map_end
; pmd
= md
, p
+= efi_desc_size
) {
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
;
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
) {
848 if (!efi_wb(check_md
))
850 if (contig_high
!= check_md
->phys_addr
)
852 contig_high
= efi_md_end(check_md
);
854 contig_high
= GRANULEROUNDDOWN(contig_high
);
856 if (!is_available_memory(md
))
860 * Round ends inward to granule boundaries
861 * Give trimmings to uncached allocator
863 if (md
->phys_addr
< contig_low
) {
864 lim
= min(efi_md_end(md
), contig_low
);
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
;
870 k
->attribute
= EFI_MEMORY_UC
;
871 k
->start
= md
->phys_addr
;
872 k
->num_pages
= (lim
- md
->phys_addr
) >> EFI_PAGE_SHIFT
;
880 if (efi_md_end(md
) > contig_high
) {
881 lim
= max(md
->phys_addr
, contig_high
);
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
;
888 k
->attribute
= EFI_MEMORY_UC
;
890 k
->num_pages
= (efi_md_end(md
) - lim
) >> EFI_PAGE_SHIFT
;
898 /* keep within max_addr= command line arg */
899 ae
= min(ae
, max_addr
);
903 /* avoid going over mem= command line arg */
904 if (total_mem
+ (ae
- as
) > mem_limit
)
905 ae
-= total_mem
+ (ae
- as
) - mem_limit
;
909 if (prev
&& kmd_end(prev
) == md
->phys_addr
) {
910 prev
->num_pages
+= (ae
- as
) >> EFI_PAGE_SHIFT
;
911 total_mem
+= ae
- as
;
914 k
->attribute
= EFI_MEMORY_WB
;
916 k
->num_pages
= (ae
- as
) >> EFI_PAGE_SHIFT
;
917 total_mem
+= ae
- as
;
920 k
->start
= ~0L; /* end-marker */
922 /* reserve the memory we are using for kern_memmap */
923 *s
= (u64
)kern_memmap
;
928 efi_initialize_iomem_resources(struct resource
*code_resource
,
929 struct resource
*data_resource
)
931 struct resource
*res
;
932 void *efi_map_start
, *efi_map_end
, *p
;
933 efi_memory_desc_t
*md
;
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
;
944 for (p
= efi_map_start
; p
< efi_map_end
; p
+= efi_desc_size
) {
947 if (md
->num_pages
== 0) /* should not happen */
950 flags
= IORESOURCE_MEM
;
953 case EFI_MEMORY_MAPPED_IO
:
954 case EFI_MEMORY_MAPPED_IO_PORT_SPACE
:
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
) {
964 flags
|= IORESOURCE_READONLY
;
970 case EFI_ACPI_MEMORY_NVS
:
971 name
= "ACPI Non-volatile Storage";
972 flags
|= IORESOURCE_BUSY
;
975 case EFI_UNUSABLE_MEMORY
:
977 flags
|= IORESOURCE_BUSY
| IORESOURCE_DISABLED
;
980 case EFI_RESERVED_TYPE
:
981 case EFI_RUNTIME_SERVICES_CODE
:
982 case EFI_RUNTIME_SERVICES_DATA
:
983 case EFI_ACPI_RECLAIM_MEMORY
:
986 flags
|= IORESOURCE_BUSY
;
990 if ((res
= kcalloc(1, sizeof(struct resource
), GFP_KERNEL
)) == NULL
) {
991 printk(KERN_ERR
"failed to alocate resource for iomem\n");
996 res
->start
= md
->phys_addr
;
997 res
->end
= md
->phys_addr
+ (md
->num_pages
<< EFI_PAGE_SHIFT
) - 1;
1000 if (insert_resource(&iomem_resource
, res
) < 0)
1004 * We don't know which region contains
1005 * kernel data so we try it repeatedly and
1006 * let the resource manager test it.
1008 insert_resource(res
, code_resource
);
1009 insert_resource(res
, data_resource
);