1 // SPDX-License-Identifier: GPL-2.0
3 * Extensible Firmware Interface
5 * Based on Extensible Firmware Interface Specification version 0.9
8 * Copyright (C) 1999 VA Linux Systems
9 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
10 * Copyright (C) 1999-2003 Hewlett-Packard Co.
11 * David Mosberger-Tang <davidm@hpl.hp.com>
12 * Stephane Eranian <eranian@hpl.hp.com>
13 * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
14 * Bjorn Helgaas <bjorn.helgaas@hp.com>
16 * All EFI Runtime Services are not implemented yet as EFI only
17 * supports physical mode addressing on SoftSDV. This is to be fixed
18 * in a future version. --drummond 1999-07-20
20 * Implemented EFI runtime services and virtual mode calls. --davidm
22 * Goutham Rao: <goutham.rao@intel.com>
23 * Skip non-WB memory and ignore empty memory ranges.
25 #include <linux/module.h>
26 #include <linux/memblock.h>
27 #include <linux/crash_dump.h>
28 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/slab.h>
32 #include <linux/time.h>
33 #include <linux/efi.h>
34 #include <linux/kexec.h>
38 #include <asm/kregs.h>
39 #include <asm/meminit.h>
40 #include <asm/processor.h>
42 #include <asm/setup.h>
43 #include <asm/tlbflush.h>
47 #define ESI_TABLE_GUID \
48 EFI_GUID(0x43EA58DC, 0xCF28, 0x4b06, 0xB3, \
49 0x91, 0xB7, 0x50, 0x59, 0x34, 0x2B, 0xD4)
51 static unsigned long mps_phys = EFI_INVALID_TABLE_ADDR;
52 static __initdata unsigned long palo_phys;
54 unsigned long __initdata esi_phys = EFI_INVALID_TABLE_ADDR;
55 unsigned long hcdp_phys = EFI_INVALID_TABLE_ADDR;
56 unsigned long sal_systab_phys = EFI_INVALID_TABLE_ADDR;
58 static const efi_config_table_type_t arch_tables[] __initconst = {
59 {ESI_TABLE_GUID, &esi_phys, "ESI" },
60 {HCDP_TABLE_GUID, &hcdp_phys, "HCDP" },
61 {MPS_TABLE_GUID, &mps_phys, "MPS" },
62 {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, &palo_phys, "PALO" },
63 {SAL_SYSTEM_TABLE_GUID, &sal_systab_phys, "SALsystab" },
67 extern efi_status_t efi_call_phys (void *, ...);
69 static efi_runtime_services_t *runtime;
70 static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
72 #define efi_call_virt(f, args...) (*(f))(args)
74 #define STUB_GET_TIME(prefix, adjust_arg) \
76 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \
78 struct ia64_fpreg fr[6]; \
79 efi_time_cap_t *atc = NULL; \
83 atc = adjust_arg(tc); \
84 ia64_save_scratch_fpregs(fr); \
85 ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), \
86 adjust_arg(tm), atc); \
87 ia64_load_scratch_fpregs(fr); \
91 #define STUB_SET_TIME(prefix, adjust_arg) \
93 prefix##_set_time (efi_time_t *tm) \
95 struct ia64_fpreg fr[6]; \
98 ia64_save_scratch_fpregs(fr); \
99 ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), \
101 ia64_load_scratch_fpregs(fr); \
105 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \
106 static efi_status_t \
107 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, \
110 struct ia64_fpreg fr[6]; \
113 ia64_save_scratch_fpregs(fr); \
114 ret = efi_call_##prefix( \
115 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time), \
116 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm)); \
117 ia64_load_scratch_fpregs(fr); \
121 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \
122 static efi_status_t \
123 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \
125 struct ia64_fpreg fr[6]; \
126 efi_time_t *atm = NULL; \
130 atm = adjust_arg(tm); \
131 ia64_save_scratch_fpregs(fr); \
132 ret = efi_call_##prefix( \
133 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time), \
135 ia64_load_scratch_fpregs(fr); \
139 #define STUB_GET_VARIABLE(prefix, adjust_arg) \
140 static efi_status_t \
141 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \
142 unsigned long *data_size, void *data) \
144 struct ia64_fpreg fr[6]; \
149 aattr = adjust_arg(attr); \
150 ia64_save_scratch_fpregs(fr); \
151 ret = efi_call_##prefix( \
152 (efi_get_variable_t *) __va(runtime->get_variable), \
153 adjust_arg(name), adjust_arg(vendor), aattr, \
154 adjust_arg(data_size), adjust_arg(data)); \
155 ia64_load_scratch_fpregs(fr); \
159 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \
160 static efi_status_t \
161 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, \
162 efi_guid_t *vendor) \
164 struct ia64_fpreg fr[6]; \
167 ia64_save_scratch_fpregs(fr); \
168 ret = efi_call_##prefix( \
169 (efi_get_next_variable_t *) __va(runtime->get_next_variable), \
170 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor)); \
171 ia64_load_scratch_fpregs(fr); \
175 #define STUB_SET_VARIABLE(prefix, adjust_arg) \
176 static efi_status_t \
177 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, \
178 u32 attr, unsigned long data_size, \
181 struct ia64_fpreg fr[6]; \
184 ia64_save_scratch_fpregs(fr); \
185 ret = efi_call_##prefix( \
186 (efi_set_variable_t *) __va(runtime->set_variable), \
187 adjust_arg(name), adjust_arg(vendor), attr, data_size, \
189 ia64_load_scratch_fpregs(fr); \
193 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \
194 static efi_status_t \
195 prefix##_get_next_high_mono_count (u32 *count) \
197 struct ia64_fpreg fr[6]; \
200 ia64_save_scratch_fpregs(fr); \
201 ret = efi_call_##prefix((efi_get_next_high_mono_count_t *) \
202 __va(runtime->get_next_high_mono_count), \
203 adjust_arg(count)); \
204 ia64_load_scratch_fpregs(fr); \
208 #define STUB_RESET_SYSTEM(prefix, adjust_arg) \
210 prefix##_reset_system (int reset_type, efi_status_t status, \
211 unsigned long data_size, efi_char16_t *data) \
213 struct ia64_fpreg fr[6]; \
214 efi_char16_t *adata = NULL; \
217 adata = adjust_arg(data); \
219 ia64_save_scratch_fpregs(fr); \
221 (efi_reset_system_t *) __va(runtime->reset_system), \
222 reset_type, status, data_size, adata); \
223 /* should not return, but just in case... */ \
224 ia64_load_scratch_fpregs(fr); \
227 #define phys_ptr(arg) ((__typeof__(arg)) ia64_tpa(arg))
229 STUB_GET_TIME(phys, phys_ptr)
230 STUB_SET_TIME(phys, phys_ptr)
231 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
232 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
233 STUB_GET_VARIABLE(phys, phys_ptr)
234 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
235 STUB_SET_VARIABLE(phys, phys_ptr)
236 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
237 STUB_RESET_SYSTEM(phys, phys_ptr)
241 STUB_GET_TIME(virt, id)
242 STUB_SET_TIME(virt, id)
243 STUB_GET_WAKEUP_TIME(virt, id)
244 STUB_SET_WAKEUP_TIME(virt, id)
245 STUB_GET_VARIABLE(virt, id)
246 STUB_GET_NEXT_VARIABLE(virt, id)
247 STUB_SET_VARIABLE(virt, id)
248 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
249 STUB_RESET_SYSTEM(virt, id)
252 efi_gettimeofday (struct timespec64 *ts)
256 if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
257 memset(ts, 0, sizeof(*ts));
261 ts->tv_sec = mktime64(tm.year, tm.month, tm.day,
262 tm.hour, tm.minute, tm.second);
263 ts->tv_nsec = tm.nanosecond;
267 is_memory_available (efi_memory_desc_t *md)
269 if (!(md->attribute & EFI_MEMORY_WB))
273 case EFI_LOADER_CODE:
274 case EFI_LOADER_DATA:
275 case EFI_BOOT_SERVICES_CODE:
276 case EFI_BOOT_SERVICES_DATA:
277 case EFI_CONVENTIONAL_MEMORY:
283 typedef struct kern_memdesc {
289 static kern_memdesc_t *kern_memmap;
291 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
294 kmd_end(kern_memdesc_t *kmd)
296 return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
300 efi_md_end(efi_memory_desc_t *md)
302 return (md->phys_addr + efi_md_size(md));
306 efi_wb(efi_memory_desc_t *md)
308 return (md->attribute & EFI_MEMORY_WB);
312 efi_uc(efi_memory_desc_t *md)
314 return (md->attribute & EFI_MEMORY_UC);
318 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
321 u64 start, end, voff;
323 voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
324 for (k = kern_memmap; k->start != ~0UL; k++) {
325 if (k->attribute != attr)
327 start = PAGE_ALIGN(k->start);
328 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
330 if ((*callback)(start + voff, end + voff, arg) < 0)
336 * Walk the EFI memory map and call CALLBACK once for each EFI memory
337 * descriptor that has memory that is available for OS use.
340 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
342 walk(callback, arg, EFI_MEMORY_WB);
346 * Walk the EFI memory map and call CALLBACK once for each EFI memory
347 * descriptor that has memory that is available for uncached allocator.
350 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
352 walk(callback, arg, EFI_MEMORY_UC);
356 * Look for the PAL_CODE region reported by EFI and map it using an
357 * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor
358 * Abstraction Layer chapter 11 in ADAG
361 efi_get_pal_addr (void)
363 void *efi_map_start, *efi_map_end, *p;
364 efi_memory_desc_t *md;
366 int pal_code_count = 0;
369 efi_map_start = __va(ia64_boot_param->efi_memmap);
370 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
371 efi_desc_size = ia64_boot_param->efi_memdesc_size;
373 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
375 if (md->type != EFI_PAL_CODE)
378 if (++pal_code_count > 1) {
379 printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
380 "dropped @ %llx\n", md->phys_addr);
384 * The only ITLB entry in region 7 that is used is the one
385 * installed by __start(). That entry covers a 64MB range.
387 mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
388 vaddr = PAGE_OFFSET + md->phys_addr;
391 * We must check that the PAL mapping won't overlap with the
394 * PAL code is guaranteed to be aligned on a power of 2 between
395 * 4k and 256KB and that only one ITR is needed to map it. This
396 * implies that the PAL code is always aligned on its size,
397 * i.e., the closest matching page size supported by the TLB.
398 * Therefore PAL code is guaranteed never to cross a 64MB unless
399 * it is bigger than 64MB (very unlikely!). So for now the
400 * following test is enough to determine whether or not we need
401 * a dedicated ITR for the PAL code.
403 if ((vaddr & mask) == (KERNEL_START & mask)) {
404 printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
409 if (efi_md_size(md) > IA64_GRANULE_SIZE)
410 panic("Whoa! PAL code size bigger than a granule!");
413 mask = ~((1 << IA64_GRANULE_SHIFT) - 1);
415 printk(KERN_INFO "CPU %d: mapping PAL code "
416 "[0x%llx-0x%llx) into [0x%llx-0x%llx)\n",
417 smp_processor_id(), md->phys_addr,
418 md->phys_addr + efi_md_size(md),
419 vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
421 return __va(md->phys_addr);
423 printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
429 static u8 __init palo_checksum(u8 *buffer, u32 length)
432 u8 *end = buffer + length;
435 sum = (u8) (sum + *(buffer++));
441 * Parse and handle PALO table which is published at:
442 * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
444 static void __init handle_palo(unsigned long phys_addr)
446 struct palo_table *palo = __va(phys_addr);
449 if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
450 printk(KERN_INFO "PALO signature incorrect.\n");
454 checksum = palo_checksum((u8 *)palo, palo->length);
456 printk(KERN_INFO "PALO checksum incorrect.\n");
460 setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
464 efi_map_pal_code (void)
466 void *pal_vaddr = efi_get_pal_addr ();
473 * Cannot write to CRx with PSR.ic=1
475 psr = ia64_clear_ic();
476 ia64_itr(0x1, IA64_TR_PALCODE,
477 GRANULEROUNDDOWN((unsigned long) pal_vaddr),
478 pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
480 ia64_set_psr(psr); /* restore psr */
486 const efi_system_table_t *efi_systab;
487 void *efi_map_start, *efi_map_end;
491 set_bit(EFI_BOOT, &efi.flags);
492 set_bit(EFI_64BIT, &efi.flags);
495 * It's too early to be able to use the standard kernel command line
498 for (cp = boot_command_line; *cp; ) {
499 if (memcmp(cp, "mem=", 4) == 0) {
500 mem_limit = memparse(cp + 4, &cp);
501 } else if (memcmp(cp, "max_addr=", 9) == 0) {
502 max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
503 } else if (memcmp(cp, "min_addr=", 9) == 0) {
504 min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
506 while (*cp != ' ' && *cp)
513 printk(KERN_INFO "Ignoring memory below %lluMB\n",
515 if (max_addr != ~0UL)
516 printk(KERN_INFO "Ignoring memory above %lluMB\n",
519 efi_systab = __va(ia64_boot_param->efi_systab);
522 * Verify the EFI Table
524 if (efi_systab == NULL)
525 panic("Whoa! Can't find EFI system table.\n");
526 if (efi_systab_check_header(&efi_systab->hdr, 1))
527 panic("Whoa! EFI system table signature incorrect\n");
529 efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor);
531 palo_phys = EFI_INVALID_TABLE_ADDR;
533 if (efi_config_parse_tables(__va(efi_systab->tables),
534 efi_systab->nr_tables,
538 if (palo_phys != EFI_INVALID_TABLE_ADDR)
539 handle_palo(palo_phys);
541 runtime = __va(efi_systab->runtime);
542 efi.get_time = phys_get_time;
543 efi.set_time = phys_set_time;
544 efi.get_wakeup_time = phys_get_wakeup_time;
545 efi.set_wakeup_time = phys_set_wakeup_time;
546 efi.get_variable = phys_get_variable;
547 efi.get_next_variable = phys_get_next_variable;
548 efi.set_variable = phys_set_variable;
549 efi.get_next_high_mono_count = phys_get_next_high_mono_count;
550 efi.reset_system = phys_reset_system;
552 efi_map_start = __va(ia64_boot_param->efi_memmap);
553 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
554 efi_desc_size = ia64_boot_param->efi_memdesc_size;
557 /* print EFI memory map: */
559 efi_memory_desc_t *md;
563 for (i = 0, p = efi_map_start; p < efi_map_end;
564 ++i, p += efi_desc_size)
571 size = md->num_pages << EFI_PAGE_SHIFT;
573 if ((size >> 40) > 0) {
576 } else if ((size >> 30) > 0) {
579 } else if ((size >> 20) > 0) {
587 printk("mem%02d: %s "
588 "range=[0x%016llx-0x%016llx) (%4lu%s)\n",
589 i, efi_md_typeattr_format(buf, sizeof(buf), md),
591 md->phys_addr + efi_md_size(md), size, unit);
597 efi_enter_virtual_mode();
601 efi_enter_virtual_mode (void)
603 void *efi_map_start, *efi_map_end, *p;
604 efi_memory_desc_t *md;
608 efi_map_start = __va(ia64_boot_param->efi_memmap);
609 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
610 efi_desc_size = ia64_boot_param->efi_memdesc_size;
612 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
614 if (md->attribute & EFI_MEMORY_RUNTIME) {
616 * Some descriptors have multiple bits set, so the
617 * order of the tests is relevant.
619 if (md->attribute & EFI_MEMORY_WB) {
620 md->virt_addr = (u64) __va(md->phys_addr);
621 } else if (md->attribute & EFI_MEMORY_UC) {
622 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
623 } else if (md->attribute & EFI_MEMORY_WC) {
625 md->virt_addr = ia64_remap(md->phys_addr,
633 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
634 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
636 } else if (md->attribute & EFI_MEMORY_WT) {
638 md->virt_addr = ia64_remap(md->phys_addr,
646 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
647 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
653 status = efi_call_phys(__va(runtime->set_virtual_address_map),
654 ia64_boot_param->efi_memmap_size,
656 ia64_boot_param->efi_memdesc_version,
657 ia64_boot_param->efi_memmap);
658 if (status != EFI_SUCCESS) {
659 printk(KERN_WARNING "warning: unable to switch EFI into "
660 "virtual mode (status=%lu)\n", status);
664 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
667 * Now that EFI is in virtual mode, we call the EFI functions more
670 efi.get_time = virt_get_time;
671 efi.set_time = virt_set_time;
672 efi.get_wakeup_time = virt_get_wakeup_time;
673 efi.set_wakeup_time = virt_set_wakeup_time;
674 efi.get_variable = virt_get_variable;
675 efi.get_next_variable = virt_get_next_variable;
676 efi.set_variable = virt_set_variable;
677 efi.get_next_high_mono_count = virt_get_next_high_mono_count;
678 efi.reset_system = virt_reset_system;
682 * Walk the EFI memory map looking for the I/O port range. There can only be
683 * one entry of this type, other I/O port ranges should be described via ACPI.
686 efi_get_iobase (void)
688 void *efi_map_start, *efi_map_end, *p;
689 efi_memory_desc_t *md;
692 efi_map_start = __va(ia64_boot_param->efi_memmap);
693 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
694 efi_desc_size = ia64_boot_param->efi_memdesc_size;
696 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
698 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
699 if (md->attribute & EFI_MEMORY_UC)
700 return md->phys_addr;
706 static struct kern_memdesc *
707 kern_memory_descriptor (unsigned long phys_addr)
709 struct kern_memdesc *md;
711 for (md = kern_memmap; md->start != ~0UL; md++) {
712 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
718 static efi_memory_desc_t *
719 efi_memory_descriptor (unsigned long phys_addr)
721 void *efi_map_start, *efi_map_end, *p;
722 efi_memory_desc_t *md;
725 efi_map_start = __va(ia64_boot_param->efi_memmap);
726 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
727 efi_desc_size = ia64_boot_param->efi_memdesc_size;
729 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
732 if (phys_addr - md->phys_addr < efi_md_size(md))
739 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
741 void *efi_map_start, *efi_map_end, *p;
742 efi_memory_desc_t *md;
746 efi_map_start = __va(ia64_boot_param->efi_memmap);
747 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
748 efi_desc_size = ia64_boot_param->efi_memdesc_size;
750 end = phys_addr + size;
752 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
754 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
761 efi_mem_type (unsigned long phys_addr)
763 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
771 efi_mem_attributes (unsigned long phys_addr)
773 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
776 return md->attribute;
779 EXPORT_SYMBOL(efi_mem_attributes);
782 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
784 unsigned long end = phys_addr + size;
785 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
792 * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
793 * the kernel that firmware needs this region mapped.
795 attr = md->attribute & ~EFI_MEMORY_RUNTIME;
797 unsigned long md_end = efi_md_end(md);
802 md = efi_memory_descriptor(md_end);
803 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
806 return 0; /* never reached */
810 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
812 unsigned long end = phys_addr + size;
813 struct kern_memdesc *md;
817 * This is a hack for ioremap calls before we set up kern_memmap.
818 * Maybe we should do efi_memmap_init() earlier instead.
821 attr = efi_mem_attribute(phys_addr, size);
822 if (attr & EFI_MEMORY_WB)
823 return EFI_MEMORY_WB;
827 md = kern_memory_descriptor(phys_addr);
831 attr = md->attribute;
833 unsigned long md_end = kmd_end(md);
838 md = kern_memory_descriptor(md_end);
839 if (!md || md->attribute != attr)
842 return 0; /* never reached */
846 valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
851 * /dev/mem reads and writes use copy_to_user(), which implicitly
852 * uses a granule-sized kernel identity mapping. It's really
853 * only safe to do this for regions in kern_memmap. For more
854 * details, see Documentation/ia64/aliasing.rst.
856 attr = kern_mem_attribute(phys_addr, size);
857 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
863 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
865 unsigned long phys_addr = pfn << PAGE_SHIFT;
868 attr = efi_mem_attribute(phys_addr, size);
871 * /dev/mem mmap uses normal user pages, so we don't need the entire
872 * granule, but the entire region we're mapping must support the same
875 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
879 * Intel firmware doesn't tell us about all the MMIO regions, so
880 * in general we have to allow mmap requests. But if EFI *does*
881 * tell us about anything inside this region, we should deny it.
882 * The user can always map a smaller region to avoid the overlap.
884 if (efi_memmap_intersects(phys_addr, size))
891 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
894 unsigned long phys_addr = pfn << PAGE_SHIFT;
898 * For /dev/mem mmap, we use user mappings, but if the region is
899 * in kern_memmap (and hence may be covered by a kernel mapping),
900 * we must use the same attribute as the kernel mapping.
902 attr = kern_mem_attribute(phys_addr, size);
903 if (attr & EFI_MEMORY_WB)
904 return pgprot_cacheable(vma_prot);
905 else if (attr & EFI_MEMORY_UC)
906 return pgprot_noncached(vma_prot);
909 * Some chipsets don't support UC access to memory. If
910 * WB is supported, we prefer that.
912 if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
913 return pgprot_cacheable(vma_prot);
915 return pgprot_noncached(vma_prot);
919 efi_uart_console_only(void)
922 char *s, name[] = "ConOut";
923 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
924 efi_char16_t *utf16, name_utf16[32];
925 unsigned char data[1024];
926 unsigned long size = sizeof(data);
927 struct efi_generic_dev_path *hdr, *end_addr;
930 /* Convert to UTF-16 */
934 *utf16++ = *s++ & 0x7f;
937 status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
938 if (status != EFI_SUCCESS) {
939 printk(KERN_ERR "No EFI %s variable?\n", name);
943 hdr = (struct efi_generic_dev_path *) data;
944 end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
945 while (hdr < end_addr) {
946 if (hdr->type == EFI_DEV_MSG &&
947 hdr->sub_type == EFI_DEV_MSG_UART)
949 else if (hdr->type == EFI_DEV_END_PATH ||
950 hdr->type == EFI_DEV_END_PATH2) {
953 if (hdr->sub_type == EFI_DEV_END_ENTIRE)
957 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
959 printk(KERN_ERR "Malformed %s value\n", name);
964 * Look for the first granule aligned memory descriptor memory
965 * that is big enough to hold EFI memory map. Make sure this
966 * descriptor is at least granule sized so it does not get trimmed
968 struct kern_memdesc *
969 find_memmap_space (void)
971 u64 contig_low=0, contig_high=0;
973 void *efi_map_start, *efi_map_end, *p, *q;
974 efi_memory_desc_t *md, *pmd = NULL, *check_md;
975 u64 space_needed, efi_desc_size;
976 unsigned long total_mem = 0;
978 efi_map_start = __va(ia64_boot_param->efi_memmap);
979 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
980 efi_desc_size = ia64_boot_param->efi_memdesc_size;
983 * Worst case: we need 3 kernel descriptors for each efi descriptor
984 * (if every entry has a WB part in the middle, and UC head and tail),
985 * plus one for the end marker.
987 space_needed = sizeof(kern_memdesc_t) *
988 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
990 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
995 if (pmd == NULL || !efi_wb(pmd) ||
996 efi_md_end(pmd) != md->phys_addr) {
997 contig_low = GRANULEROUNDUP(md->phys_addr);
998 contig_high = efi_md_end(md);
999 for (q = p + efi_desc_size; q < efi_map_end;
1000 q += efi_desc_size) {
1002 if (!efi_wb(check_md))
1004 if (contig_high != check_md->phys_addr)
1006 contig_high = efi_md_end(check_md);
1008 contig_high = GRANULEROUNDDOWN(contig_high);
1010 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1013 /* Round ends inward to granule boundaries */
1014 as = max(contig_low, md->phys_addr);
1015 ae = min(contig_high, efi_md_end(md));
1017 /* keep within max_addr= and min_addr= command line arg */
1018 as = max(as, min_addr);
1019 ae = min(ae, max_addr);
1023 /* avoid going over mem= command line arg */
1024 if (total_mem + (ae - as) > mem_limit)
1025 ae -= total_mem + (ae - as) - mem_limit;
1030 if (ae - as > space_needed)
1033 if (p >= efi_map_end)
1034 panic("Can't allocate space for kernel memory descriptors");
1040 * Walk the EFI memory map and gather all memory available for kernel
1041 * to use. We can allocate partial granules only if the unavailable
1042 * parts exist, and are WB.
1045 efi_memmap_init(u64 *s, u64 *e)
1047 struct kern_memdesc *k, *prev = NULL;
1048 u64 contig_low=0, contig_high=0;
1050 void *efi_map_start, *efi_map_end, *p, *q;
1051 efi_memory_desc_t *md, *pmd = NULL, *check_md;
1053 unsigned long total_mem = 0;
1055 k = kern_memmap = find_memmap_space();
1057 efi_map_start = __va(ia64_boot_param->efi_memmap);
1058 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1059 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1061 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1065 (md->type == EFI_CONVENTIONAL_MEMORY ||
1066 md->type == EFI_BOOT_SERVICES_DATA)) {
1067 k->attribute = EFI_MEMORY_UC;
1068 k->start = md->phys_addr;
1069 k->num_pages = md->num_pages;
1074 if (pmd == NULL || !efi_wb(pmd) ||
1075 efi_md_end(pmd) != md->phys_addr) {
1076 contig_low = GRANULEROUNDUP(md->phys_addr);
1077 contig_high = efi_md_end(md);
1078 for (q = p + efi_desc_size; q < efi_map_end;
1079 q += efi_desc_size) {
1081 if (!efi_wb(check_md))
1083 if (contig_high != check_md->phys_addr)
1085 contig_high = efi_md_end(check_md);
1087 contig_high = GRANULEROUNDDOWN(contig_high);
1089 if (!is_memory_available(md))
1093 * Round ends inward to granule boundaries
1094 * Give trimmings to uncached allocator
1096 if (md->phys_addr < contig_low) {
1097 lim = min(efi_md_end(md), contig_low);
1099 if (k > kern_memmap &&
1100 (k-1)->attribute == EFI_MEMORY_UC &&
1101 kmd_end(k-1) == md->phys_addr) {
1103 (lim - md->phys_addr)
1106 k->attribute = EFI_MEMORY_UC;
1107 k->start = md->phys_addr;
1108 k->num_pages = (lim - md->phys_addr)
1117 if (efi_md_end(md) > contig_high) {
1118 lim = max(md->phys_addr, contig_high);
1120 if (lim == md->phys_addr && k > kern_memmap &&
1121 (k-1)->attribute == EFI_MEMORY_UC &&
1122 kmd_end(k-1) == md->phys_addr) {
1123 (k-1)->num_pages += md->num_pages;
1125 k->attribute = EFI_MEMORY_UC;
1127 k->num_pages = (efi_md_end(md) - lim)
1134 ae = efi_md_end(md);
1136 /* keep within max_addr= and min_addr= command line arg */
1137 as = max(as, min_addr);
1138 ae = min(ae, max_addr);
1142 /* avoid going over mem= command line arg */
1143 if (total_mem + (ae - as) > mem_limit)
1144 ae -= total_mem + (ae - as) - mem_limit;
1148 if (prev && kmd_end(prev) == md->phys_addr) {
1149 prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1150 total_mem += ae - as;
1153 k->attribute = EFI_MEMORY_WB;
1155 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1156 total_mem += ae - as;
1159 k->start = ~0L; /* end-marker */
1161 /* reserve the memory we are using for kern_memmap */
1162 *s = (u64)kern_memmap;
1169 efi_initialize_iomem_resources(struct resource *code_resource,
1170 struct resource *data_resource,
1171 struct resource *bss_resource)
1173 struct resource *res;
1174 void *efi_map_start, *efi_map_end, *p;
1175 efi_memory_desc_t *md;
1178 unsigned long flags, desc;
1180 efi_map_start = __va(ia64_boot_param->efi_memmap);
1181 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1182 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1186 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1189 if (md->num_pages == 0) /* should not happen */
1192 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1193 desc = IORES_DESC_NONE;
1197 case EFI_MEMORY_MAPPED_IO:
1198 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1201 case EFI_LOADER_CODE:
1202 case EFI_LOADER_DATA:
1203 case EFI_BOOT_SERVICES_DATA:
1204 case EFI_BOOT_SERVICES_CODE:
1205 case EFI_CONVENTIONAL_MEMORY:
1206 if (md->attribute & EFI_MEMORY_WP) {
1207 name = "System ROM";
1208 flags |= IORESOURCE_READONLY;
1209 } else if (md->attribute == EFI_MEMORY_UC) {
1210 name = "Uncached RAM";
1212 name = "System RAM";
1213 flags |= IORESOURCE_SYSRAM;
1217 case EFI_ACPI_MEMORY_NVS:
1218 name = "ACPI Non-volatile Storage";
1219 desc = IORES_DESC_ACPI_NV_STORAGE;
1222 case EFI_UNUSABLE_MEMORY:
1224 flags |= IORESOURCE_DISABLED;
1227 case EFI_PERSISTENT_MEMORY:
1228 name = "Persistent Memory";
1229 desc = IORES_DESC_PERSISTENT_MEMORY;
1232 case EFI_RESERVED_TYPE:
1233 case EFI_RUNTIME_SERVICES_CODE:
1234 case EFI_RUNTIME_SERVICES_DATA:
1235 case EFI_ACPI_RECLAIM_MEMORY:
1241 if ((res = kzalloc(sizeof(struct resource),
1242 GFP_KERNEL)) == NULL) {
1244 "failed to allocate resource for iomem\n");
1249 res->start = md->phys_addr;
1250 res->end = md->phys_addr + efi_md_size(md) - 1;
1254 if (insert_resource(&iomem_resource, res) < 0)
1258 * We don't know which region contains
1259 * kernel data so we try it repeatedly and
1260 * let the resource manager test it.
1262 insert_resource(res, code_resource);
1263 insert_resource(res, data_resource);
1264 insert_resource(res, bss_resource);
1266 insert_resource(res, &efi_memmap_res);
1267 insert_resource(res, &boot_param_res);
1268 if (crashk_res.end > crashk_res.start)
1269 insert_resource(res, &crashk_res);
1276 /* find a block of memory aligned to 64M exclude reserved regions
1277 rsvd_regions are sorted
1279 unsigned long __init
1280 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1284 u64 alignment = 1UL << _PAGE_SIZE_64M;
1285 void *efi_map_start, *efi_map_end, *p;
1286 efi_memory_desc_t *md;
1289 efi_map_start = __va(ia64_boot_param->efi_memmap);
1290 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1291 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1293 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1297 start = ALIGN(md->phys_addr, alignment);
1298 end = efi_md_end(md);
1299 for (i = 0; i < n; i++) {
1300 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1301 if (__pa(r[i].start) > start + size)
1303 start = ALIGN(__pa(r[i].end), alignment);
1305 __pa(r[i+1].start) < start + size)
1311 if (end > start + size)
1316 "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1321 #ifdef CONFIG_CRASH_DUMP
1322 /* locate the size find a the descriptor at a certain address */
1323 unsigned long __init
1324 vmcore_find_descriptor_size (unsigned long address)
1326 void *efi_map_start, *efi_map_end, *p;
1327 efi_memory_desc_t *md;
1329 unsigned long ret = 0;
1331 efi_map_start = __va(ia64_boot_param->efi_memmap);
1332 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
1333 efi_desc_size = ia64_boot_param->efi_memdesc_size;
1335 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1337 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1338 && md->phys_addr == address) {
1339 ret = efi_md_size(md);
1345 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1351 char *efi_systab_show_arch(char *str)
1353 if (mps_phys != EFI_INVALID_TABLE_ADDR)
1354 str += sprintf(str, "MPS=0x%lx\n", mps_phys);
1355 if (hcdp_phys != EFI_INVALID_TABLE_ADDR)
1356 str += sprintf(str, "HCDP=0x%lx\n", hcdp_phys);