1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * EFI initialization
4 *
5 * Author: Jianmin Lv <lvjianmin@loongson.cn>
6 * Huacai Chen <chenhuacai@loongson.cn
7 *
8 * Copyright (C) 2020-2022 Loongson Technology
9 */
10
11 #include <linux/acpi.h>
12 #include <linux/efi.h>
13 #include <linux/efi-bgrt.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/export.h>
17 #include <linux/io.h>
18 #include <linux/kobject.h>
19 #include <linux/memblock.h>
20 #include <linux/reboot.h>
21 #include <linux/screen_info.h>
22 #include <linux/uaccess.h>
23
24 #include <asm/early_ioremap.h>
25 #include <asm/efi.h>
26 #include <asm/loongson.h>
27
28 static unsigned long efi_nr_tables;
29 static unsigned long efi_config_table;
30
31 static unsigned long __initdata boot_memmap =
32 static unsigned long __initdata fdt_pointer =
33
34 static efi_system_table_t *efi_systab;
35 static efi_config_table_type_t arch_tables[] _
36 {LINUX_EFI_BOOT_MEMMAP_GUID, &boot_
37 {DEVICE_TREE_GUID, &fdt_p
38 {},
39 };
40
41 void __init *efi_fdt_pointer(void)
42 {
43 if (!efi_systab)
44 return NULL;
45
46 if (fdt_pointer == EFI_INVALID_TABLE_A
47 return NULL;
48
49 return early_memremap_ro(fdt_pointer,
50 }
51
52 void __init efi_runtime_init(void)
53 {
54 if (!efi_enabled(EFI_BOOT) || !efi_sys
55 return;
56
57 if (efi_runtime_disabled()) {
58 pr_info("EFI runtime services
59 return;
60 }
61
62 efi.runtime = (efi_runtime_services_t
63 efi.runtime_version = (unsigned int)ef
64
65 efi_native_runtime_setup();
66 set_bit(EFI_RUNTIME_SERVICES, &efi.fla
67 }
68
69 bool efi_poweroff_required(void)
70 {
71 return efi_enabled(EFI_RUNTIME_SERVICE
72 (acpi_gbl_reduced_hardware ||
73 }
74
75 unsigned long __initdata screen_info_table = E
76
77 #if defined(CONFIG_SYSFB) || defined(CONFIG_EF
78 struct screen_info screen_info __section(".dat
79 EXPORT_SYMBOL_GPL(screen_info);
80 #endif
81
82 static void __init init_screen_info(void)
83 {
84 struct screen_info *si;
85
86 if (screen_info_table == EFI_INVALID_T
87 return;
88
89 si = early_memremap(screen_info_table,
90 if (!si) {
91 pr_err("Could not map screen_i
92 return;
93 }
94 screen_info = *si;
95 memset(si, 0, sizeof(*si));
96 early_memunmap(si, sizeof(*si));
97
98 memblock_reserve(screen_info.lfb_base,
99 }
100
101 void __init efi_init(void)
102 {
103 int size;
104 void *config_tables;
105 struct efi_boot_memmap *tbl;
106
107 if (!efi_system_table)
108 return;
109
110 efi_systab = (efi_system_table_t *)ear
111 if (!efi_systab) {
112 pr_err("Can't find EFI system
113 return;
114 }
115
116 efi_systab_report_header(&efi_systab->
117
118 set_bit(EFI_64BIT, &efi.flags);
119 efi_nr_tables = efi_systab->nr_tabl
120 efi_config_table = (unsigned long)efi_
121
122 size = sizeof(efi_config_table_t);
123 config_tables = early_memremap(efi_con
124 efi_config_parse_tables(config_tables,
125 early_memunmap(config_tables, efi_nr_t
126
127 set_bit(EFI_CONFIG_TABLES, &efi.flags)
128
129 if (IS_ENABLED(CONFIG_EFI_EARLYCON) ||
130 init_screen_info();
131
132 if (boot_memmap == EFI_INVALID_TABLE_A
133 return;
134
135 tbl = early_memremap_ro(boot_memmap, s
136 if (tbl) {
137 struct efi_memory_map_data dat
138
139 data.phys_map = boot
140 data.size = tbl-
141 data.desc_size = tbl-
142 data.desc_version = tbl-
143
144 if (efi_memmap_init_early(&dat
145 panic("Unable to map E
146
147 early_memunmap(tbl, sizeof(*tb
148 }
149
150 efi_esrt_init();
151 }
152
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