1 // SPDX-License-Identifier: GPL-2.0
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 Corporation Limited
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/uaccess.h>
22
23 #include <asm/early_ioremap.h>
24 #include <asm/efi.h>
25 #include <asm/loongson.h>
26
27 static unsigned long efi_nr_tables;
28 static unsigned long efi_config_table;
29
30 static unsigned long __initdata boot_memmap = EFI_INVALID_TABLE_ADDR;
31 static unsigned long __initdata fdt_pointer = EFI_INVALID_TABLE_ADDR;
32
33 static efi_system_table_t *efi_systab;
34 static efi_config_table_type_t arch_tables[] __initdata = {
35 {LINUX_EFI_BOOT_MEMMAP_GUID, &boot_memmap, "MEMMAP" },
36 {DEVICE_TREE_GUID, &fdt_pointer, "FDTPTR" },
37 {},
38 };
39
efi_fdt_pointer(void)40 void __init *efi_fdt_pointer(void)
41 {
42 if (!efi_systab)
43 return NULL;
44
45 if (fdt_pointer == EFI_INVALID_TABLE_ADDR)
46 return NULL;
47
48 return early_memremap_ro(fdt_pointer, SZ_64K);
49 }
50
efi_runtime_init(void)51 void __init efi_runtime_init(void)
52 {
53 if (!efi_enabled(EFI_BOOT) || !efi_systab->runtime)
54 return;
55
56 if (efi_runtime_disabled()) {
57 pr_info("EFI runtime services will be disabled.\n");
58 return;
59 }
60
61 efi.runtime = (efi_runtime_services_t *)efi_systab->runtime;
62 efi.runtime_version = (unsigned int)efi.runtime->hdr.revision;
63
64 efi_native_runtime_setup();
65 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
66 }
67
68 unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR;
69
init_screen_info(void)70 static void __init init_screen_info(void)
71 {
72 struct screen_info *si;
73
74 if (screen_info_table == EFI_INVALID_TABLE_ADDR)
75 return;
76
77 si = early_memremap(screen_info_table, sizeof(*si));
78 if (!si) {
79 pr_err("Could not map screen_info config table\n");
80 return;
81 }
82 screen_info = *si;
83 memset(si, 0, sizeof(*si));
84 early_memunmap(si, sizeof(*si));
85
86 memblock_reserve(screen_info.lfb_base, screen_info.lfb_size);
87 }
88
efi_init(void)89 void __init efi_init(void)
90 {
91 int size;
92 void *config_tables;
93 struct efi_boot_memmap *tbl;
94
95 if (!efi_system_table)
96 return;
97
98 efi_systab = (efi_system_table_t *)early_memremap_ro(efi_system_table, sizeof(*efi_systab));
99 if (!efi_systab) {
100 pr_err("Can't find EFI system table.\n");
101 return;
102 }
103
104 efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor);
105
106 set_bit(EFI_64BIT, &efi.flags);
107 efi_nr_tables = efi_systab->nr_tables;
108 efi_config_table = (unsigned long)efi_systab->tables;
109
110 size = sizeof(efi_config_table_t);
111 config_tables = early_memremap(efi_config_table, efi_nr_tables * size);
112 efi_config_parse_tables(config_tables, efi_systab->nr_tables, arch_tables);
113 early_memunmap(config_tables, efi_nr_tables * size);
114
115 set_bit(EFI_CONFIG_TABLES, &efi.flags);
116
117 init_screen_info();
118
119 if (boot_memmap == EFI_INVALID_TABLE_ADDR)
120 return;
121
122 tbl = early_memremap_ro(boot_memmap, sizeof(*tbl));
123 if (tbl) {
124 struct efi_memory_map_data data;
125
126 data.phys_map = boot_memmap + sizeof(*tbl);
127 data.size = tbl->map_size;
128 data.desc_size = tbl->desc_size;
129 data.desc_version = tbl->desc_ver;
130
131 if (efi_memmap_init_early(&data) < 0)
132 panic("Unable to map EFI memory map.\n");
133
134 early_memunmap(tbl, sizeof(*tbl));
135 }
136 }
137