1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2015 Google, Inc
4 *
5 * EFI information obtained here:
6 * http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES
7 *
8 * This file implements U-Boot running as an EFI application.
9 */
10
11 #include <common.h>
12 #include <cpu_func.h>
13 #include <debug_uart.h>
14 #include <dm.h>
15 #include <errno.h>
16 #include <init.h>
17 #include <malloc.h>
18 #include <asm/global_data.h>
19 #include <linux/err.h>
20 #include <linux/types.h>
21 #include <efi.h>
22 #include <efi_api.h>
23 #include <sysreset.h>
24
25 DECLARE_GLOBAL_DATA_PTR;
26
27 static struct efi_priv *global_priv;
28
efi_get_sys_table(void)29 struct efi_system_table *efi_get_sys_table(void)
30 {
31 return global_priv->sys_table;
32 }
33
efi_get_ram_base(void)34 unsigned long efi_get_ram_base(void)
35 {
36 return global_priv->ram_base;
37 }
38
setup_memory(struct efi_priv * priv)39 static efi_status_t setup_memory(struct efi_priv *priv)
40 {
41 struct efi_boot_services *boot = priv->boot;
42 efi_physical_addr_t addr;
43 efi_status_t ret;
44 int pages;
45
46 /*
47 * Use global_data_ptr instead of gd since it is an assignment. There
48 * are very few assignments to global_data in U-Boot and this makes
49 * it easier to find them.
50 */
51 global_data_ptr = efi_malloc(priv, sizeof(struct global_data), &ret);
52 if (!global_data_ptr)
53 return ret;
54 memset(gd, '\0', sizeof(*gd));
55
56 gd->malloc_base = (ulong)efi_malloc(priv, CONFIG_VAL(SYS_MALLOC_F_LEN),
57 &ret);
58 if (!gd->malloc_base)
59 return ret;
60 pages = CONFIG_EFI_RAM_SIZE >> 12;
61
62 /*
63 * Don't allocate any memory above 4GB. U-Boot is a 32-bit application
64 * so we want it to load below 4GB.
65 */
66 addr = 1ULL << 32;
67 ret = boot->allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
68 priv->image_data_type, pages, &addr);
69 if (ret) {
70 printf("(using pool %lx) ", ret);
71 priv->ram_base = (ulong)efi_malloc(priv, CONFIG_EFI_RAM_SIZE,
72 &ret);
73 if (!priv->ram_base)
74 return ret;
75 priv->use_pool_for_malloc = true;
76 } else {
77 priv->ram_base = addr;
78 }
79 gd->ram_size = pages << 12;
80
81 return 0;
82 }
83
free_memory(struct efi_priv * priv)84 static void free_memory(struct efi_priv *priv)
85 {
86 struct efi_boot_services *boot = priv->boot;
87
88 if (priv->use_pool_for_malloc)
89 efi_free(priv, (void *)priv->ram_base);
90 else
91 boot->free_pages(priv->ram_base, gd->ram_size >> 12);
92
93 efi_free(priv, (void *)gd->malloc_base);
94 efi_free(priv, gd);
95 global_data_ptr = NULL;
96 }
97
98 /**
99 * efi_main() - Start an EFI image
100 *
101 * This function is called by our EFI start-up code. It handles running
102 * U-Boot. If it returns, EFI will continue. Another way to get back to EFI
103 * is via reset_cpu().
104 */
efi_main(efi_handle_t image,struct efi_system_table * sys_table)105 efi_status_t EFIAPI efi_main(efi_handle_t image,
106 struct efi_system_table *sys_table)
107 {
108 struct efi_priv local_priv, *priv = &local_priv;
109 efi_status_t ret;
110
111 /* Set up access to EFI data structures */
112 efi_init(priv, "App", image, sys_table);
113
114 global_priv = priv;
115
116 /*
117 * Set up the EFI debug UART so that printf() works. This is
118 * implemented in the EFI serial driver, serial_efi.c. The application
119 * can use printf() freely.
120 */
121 debug_uart_init();
122
123 ret = setup_memory(priv);
124 if (ret) {
125 printf("Failed to set up memory: ret=%lx\n", ret);
126 return ret;
127 }
128
129 printf("starting\n");
130
131 board_init_f(GD_FLG_SKIP_RELOC);
132 board_init_r(NULL, 0);
133 free_memory(priv);
134
135 return EFI_SUCCESS;
136 }
137
efi_exit(void)138 static void efi_exit(void)
139 {
140 struct efi_priv *priv = global_priv;
141
142 free_memory(priv);
143 printf("U-Boot EFI exiting\n");
144 priv->boot->exit(priv->parent_image, EFI_SUCCESS, 0, NULL);
145 }
146
efi_sysreset_request(struct udevice * dev,enum sysreset_t type)147 static int efi_sysreset_request(struct udevice *dev, enum sysreset_t type)
148 {
149 efi_exit();
150
151 return -EINPROGRESS;
152 }
153
154 static const struct udevice_id efi_sysreset_ids[] = {
155 { .compatible = "efi,reset" },
156 { }
157 };
158
159 static struct sysreset_ops efi_sysreset_ops = {
160 .request = efi_sysreset_request,
161 };
162
163 U_BOOT_DRIVER(efi_sysreset) = {
164 .name = "efi-sysreset",
165 .id = UCLASS_SYSRESET,
166 .of_match = efi_sysreset_ids,
167 .ops = &efi_sysreset_ops,
168 };
169