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