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 * Common EFI functions
9 */
10
11 #include <common.h>
12 #include <debug_uart.h>
13 #include <errno.h>
14 #include <malloc.h>
15 #include <linux/err.h>
16 #include <linux/types.h>
17 #include <efi.h>
18 #include <efi_api.h>
19
20 /*
21 * Unfortunately we cannot access any code outside what is built especially
22 * for the stub. lib/string.c is already being built for the U-Boot payload
23 * so it uses the wrong compiler flags. Add our own memset() here.
24 */
efi_memset(void * ptr,int ch,int size)25 static void efi_memset(void *ptr, int ch, int size)
26 {
27 char *dest = ptr;
28
29 while (size-- > 0)
30 *dest++ = ch;
31 }
32
33 /*
34 * Since the EFI stub cannot access most of the U-Boot code, add our own
35 * simple console output functions here. The EFI app will not use these since
36 * it can use the normal console.
37 */
efi_putc(struct efi_priv * priv,const char ch)38 void efi_putc(struct efi_priv *priv, const char ch)
39 {
40 struct efi_simple_text_output_protocol *con = priv->sys_table->con_out;
41 uint16_t ucode[2];
42
43 ucode[0] = ch;
44 ucode[1] = '\0';
45 con->output_string(con, ucode);
46 }
47
efi_puts(struct efi_priv * priv,const char * str)48 void efi_puts(struct efi_priv *priv, const char *str)
49 {
50 while (*str)
51 efi_putc(priv, *str++);
52 }
53
efi_init(struct efi_priv * priv,const char * banner,efi_handle_t image,struct efi_system_table * sys_table)54 int efi_init(struct efi_priv *priv, const char *banner, efi_handle_t image,
55 struct efi_system_table *sys_table)
56 {
57 efi_guid_t loaded_image_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
58 struct efi_boot_services *boot = sys_table->boottime;
59 struct efi_loaded_image *loaded_image;
60 int ret;
61
62 efi_memset(priv, '\0', sizeof(*priv));
63 priv->sys_table = sys_table;
64 priv->boot = sys_table->boottime;
65 priv->parent_image = image;
66 priv->run = sys_table->runtime;
67
68 efi_puts(priv, "U-Boot EFI ");
69 efi_puts(priv, banner);
70 efi_putc(priv, ' ');
71
72 ret = boot->open_protocol(priv->parent_image, &loaded_image_guid,
73 (void **)&loaded_image, priv->parent_image,
74 NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
75 if (ret) {
76 efi_puts(priv, "Failed to get loaded image protocol\n");
77 return ret;
78 }
79 priv->image_data_type = loaded_image->image_data_type;
80
81 return 0;
82 }
83
efi_malloc(struct efi_priv * priv,int size,efi_status_t * retp)84 void *efi_malloc(struct efi_priv *priv, int size, efi_status_t *retp)
85 {
86 struct efi_boot_services *boot = priv->boot;
87 void *buf = NULL;
88
89 *retp = boot->allocate_pool(priv->image_data_type, size, &buf);
90
91 return buf;
92 }
93
efi_free(struct efi_priv * priv,void * ptr)94 void efi_free(struct efi_priv *priv, void *ptr)
95 {
96 struct efi_boot_services *boot = priv->boot;
97
98 boot->free_pool(ptr);
99 }
100