1 /* 2 * Copyright (c) 2015 Google, Inc 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 * 6 * EFI information obtained here: 7 * http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES 8 * 9 * Common EFI functions 10 */ 11 12 #include <common.h> 13 #include <debug_uart.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 20 DECLARE_GLOBAL_DATA_PTR; 21 22 /* 23 * Unfortunately we cannot access any code outside what is built especially 24 * for the stub. lib/string.c is already being built for the U-Boot payload 25 * so it uses the wrong compiler flags. Add our own memset() here. 26 */ 27 static void efi_memset(void *ptr, int ch, int size) 28 { 29 char *dest = ptr; 30 31 while (size-- > 0) 32 *dest++ = ch; 33 } 34 35 /* 36 * Since the EFI stub cannot access most of the U-Boot code, add our own 37 * simple console output functions here. The EFI app will not use these since 38 * it can use the normal console. 39 */ 40 void efi_putc(struct efi_priv *priv, const char ch) 41 { 42 struct efi_simple_text_output_protocol *con = priv->sys_table->con_out; 43 uint16_t ucode[2]; 44 45 ucode[0] = ch; 46 ucode[1] = '\0'; 47 con->output_string(con, ucode); 48 } 49 50 void efi_puts(struct efi_priv *priv, const char *str) 51 { 52 while (*str) 53 efi_putc(priv, *str++); 54 } 55 56 int efi_init(struct efi_priv *priv, const char *banner, efi_handle_t image, 57 struct efi_system_table *sys_table) 58 { 59 efi_guid_t loaded_image_guid = LOADED_IMAGE_PROTOCOL_GUID; 60 struct efi_boot_services *boot = sys_table->boottime; 61 struct efi_loaded_image *loaded_image; 62 int ret; 63 64 efi_memset(priv, '\0', sizeof(*priv)); 65 priv->sys_table = sys_table; 66 priv->boot = sys_table->boottime; 67 priv->parent_image = image; 68 priv->run = sys_table->runtime; 69 70 efi_puts(priv, "U-Boot EFI "); 71 efi_puts(priv, banner); 72 efi_putc(priv, ' '); 73 74 ret = boot->open_protocol(priv->parent_image, &loaded_image_guid, 75 (void **)&loaded_image, &priv->parent_image, 76 NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL); 77 if (ret) { 78 efi_puts(priv, "Failed to get loaded image protocol\n"); 79 return ret; 80 } 81 priv->image_data_type = loaded_image->image_data_type; 82 83 return 0; 84 } 85 86 void *efi_malloc(struct efi_priv *priv, int size, efi_status_t *retp) 87 { 88 struct efi_boot_services *boot = priv->boot; 89 void *buf = NULL; 90 91 *retp = boot->allocate_pool(priv->image_data_type, size, &buf); 92 93 return buf; 94 } 95 96 void efi_free(struct efi_priv *priv, void *ptr) 97 { 98 struct efi_boot_services *boot = priv->boot; 99 100 boot->free_pool(ptr); 101 } 102