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Ard Biesheuvel4febfb82019-02-02 10:41:15 +01001// SPDX-License-Identifier: GPL-2.0
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +01002/*
3 * Extensible Firmware Interface
4 *
5 * Based on Extensible Firmware Interface Specification version 2.4
6 *
7 * Copyright (C) 2013, 2014 Linaro Ltd.
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +01008 */
9
Ard Biesheuvelbb817be2017-06-02 13:52:07 +000010#include <linux/dmi.h>
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +010011#include <linux/efi.h>
Ard Biesheuvelf7d92482015-11-30 13:28:19 +010012#include <linux/io.h>
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +010013#include <linux/memblock.h>
14#include <linux/mm_types.h>
15#include <linux/preempt.h>
16#include <linux/rbtree.h>
17#include <linux/rwsem.h>
18#include <linux/sched.h>
19#include <linux/slab.h>
20#include <linux/spinlock.h>
21
22#include <asm/cacheflush.h>
23#include <asm/efi.h>
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +010024#include <asm/mmu.h>
Ard Biesheuvelf7d92482015-11-30 13:28:19 +010025#include <asm/pgalloc.h>
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +010026#include <asm/pgtable.h>
27
Steven Price102f45f2020-02-03 17:36:29 -080028#if defined(CONFIG_PTDUMP_DEBUGFS) && defined(CONFIG_ARM64)
Ard Biesheuvel9d804482016-08-16 14:13:21 +020029#include <asm/ptdump.h>
30
31static struct ptdump_info efi_ptdump_info = {
32 .mm = &efi_mm,
33 .markers = (struct addr_marker[]){
Qian Cai74c953c2019-02-02 10:50:17 +010034 { 0, "UEFI runtime start" },
35 { DEFAULT_MAP_WINDOW_64, "UEFI runtime end" },
36 { -1, NULL }
Ard Biesheuvel9d804482016-08-16 14:13:21 +020037 },
38 .base_addr = 0,
39};
40
41static int __init ptdump_init(void)
42{
Nathan Chancellor67f52a92019-02-01 12:20:01 -070043 if (efi_enabled(EFI_RUNTIME_SERVICES))
44 ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables");
Mark Rutland6b31a2f2018-03-08 08:00:09 +000045
Nathan Chancellor67f52a92019-02-01 12:20:01 -070046 return 0;
Ard Biesheuvel9d804482016-08-16 14:13:21 +020047}
48device_initcall(ptdump_init);
49
50#endif
51
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +010052static bool __init efi_virtmap_init(void)
53{
54 efi_memory_desc_t *md;
55
Ard Biesheuvelf7d92482015-11-30 13:28:19 +010056 efi_mm.pgd = pgd_alloc(&efi_mm);
Ard Biesheuveld1eb9812017-03-01 19:05:54 +000057 mm_init_cpumask(&efi_mm);
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +010058 init_new_context(NULL, &efi_mm);
59
Matt Fleming78ce2482016-04-25 21:06:38 +010060 for_each_efi_memory_desc(md) {
Ard Biesheuvelf7d92482015-11-30 13:28:19 +010061 phys_addr_t phys = md->phys_addr;
62 int ret;
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +010063
64 if (!(md->attribute & EFI_MEMORY_RUNTIME))
65 continue;
66 if (md->virt_addr == 0)
67 return false;
68
Ard Biesheuvelf7d92482015-11-30 13:28:19 +010069 ret = efi_create_mapping(&efi_mm, md);
Ard Biesheuvel1832e6412018-03-08 08:00:11 +000070 if (ret) {
Ard Biesheuvelf7d92482015-11-30 13:28:19 +010071 pr_warn(" EFI remap %pa: failed to create mapping (%d)\n",
72 &phys, ret);
73 return false;
74 }
Ard Biesheuvel789957e2016-04-25 21:06:46 +010075 }
76
77 if (efi_memattr_apply_permissions(&efi_mm, efi_set_mapping_permissions))
78 return false;
79
80 return true;
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +010081}
82
83/*
84 * Enable the UEFI Runtime Services if all prerequisites are in place, i.e.,
85 * non-early mapping of the UEFI system table and virtual mappings for all
86 * EFI_MEMORY_RUNTIME regions.
87 */
Ard Biesheuvelf7d92482015-11-30 13:28:19 +010088static int __init arm_enable_runtime_services(void)
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +010089{
90 u64 mapsize;
91
Ard Biesheuvel33412b82018-11-14 09:55:41 -080092 if (!efi_enabled(EFI_BOOT)) {
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +010093 pr_info("EFI services will not be available.\n");
94 return 0;
95 }
96
Ard Biesheuvel3ea86492018-07-23 10:57:30 +090097 efi_memmap_unmap();
98
AKASHI Takahiro20d12cf2018-07-23 10:57:31 +090099 mapsize = efi.memmap.desc_size * efi.memmap.nr_map;
100
101 if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) {
102 pr_err("Failed to remap EFI memory map\n");
103 return 0;
104 }
105
Dan Williams16993c02019-11-06 17:43:21 -0800106 if (efi_soft_reserve_enabled()) {
107 efi_memory_desc_t *md;
108
109 for_each_efi_memory_desc(md) {
110 int md_size = md->num_pages << EFI_PAGE_SHIFT;
111 struct resource *res;
112
113 if (!(md->attribute & EFI_MEMORY_SP))
114 continue;
115
116 res = kzalloc(sizeof(*res), GFP_KERNEL);
117 if (WARN_ON(!res))
118 break;
119
120 res->start = md->phys_addr;
121 res->end = md->phys_addr + md_size - 1;
122 res->name = "Soft Reserved";
123 res->flags = IORESOURCE_MEM;
124 res->desc = IORES_DESC_SOFT_RESERVED;
125
126 insert_resource(&iomem_resource, res);
127 }
128 }
129
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +0100130 if (efi_runtime_disabled()) {
131 pr_info("EFI runtime services will be disabled.\n");
132 return 0;
133 }
134
Shannon Zhao0cac5c32016-05-12 20:19:54 +0800135 if (efi_enabled(EFI_RUNTIME_SERVICES)) {
136 pr_info("EFI runtime services access via paravirt.\n");
137 return 0;
138 }
139
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +0100140 pr_info("Remapping and enabling EFI services.\n");
141
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +0100142 if (!efi_virtmap_init()) {
Ard Biesheuvel14c43be2016-04-25 21:06:34 +0100143 pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n");
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +0100144 return -ENOMEM;
145 }
146
147 /* Set up runtime services function pointers */
148 efi_native_runtime_setup();
149 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
150
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +0100151 return 0;
152}
Ard Biesheuvelf7d92482015-11-30 13:28:19 +0100153early_initcall(arm_enable_runtime_services);
Ard Biesheuvele5bc22a2015-11-30 13:28:18 +0100154
155void efi_virtmap_load(void)
156{
157 preempt_disable();
158 efi_set_pgd(&efi_mm);
159}
160
161void efi_virtmap_unload(void)
162{
163 efi_set_pgd(current->active_mm);
164 preempt_enable();
165}
Ard Biesheuvelbb817be2017-06-02 13:52:07 +0000166
167
168static int __init arm_dmi_init(void)
169{
170 /*
Robert Richter0fca0812019-03-28 20:34:28 +0100171 * On arm64/ARM, DMI depends on UEFI, and dmi_setup() needs to
Ard Biesheuvelbb817be2017-06-02 13:52:07 +0000172 * be called early because dmi_id_init(), which is an arch_initcall
173 * itself, depends on dmi_scan_machine() having been called already.
174 */
Robert Richter0fca0812019-03-28 20:34:28 +0100175 dmi_setup();
Ard Biesheuvelbb817be2017-06-02 13:52:07 +0000176 return 0;
177}
178core_initcall(arm_dmi_init);