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