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 */ 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 */ 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 47 void efi_puts(struct efi_priv *priv, const char *str) 48 { 49 while (*str) 50 efi_putc(priv, *str++); 51 } 52 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 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 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