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 /* 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 */ 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 */ 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 48 void efi_puts(struct efi_priv *priv, const char *str) 49 { 50 while (*str) 51 efi_putc(priv, *str++); 52 } 53 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 = 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 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 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