1/* $NetBSD: efi.c,v 1.5 2016/08/04 18:07:43 scole Exp $ */ 2 3/*- 4 * Copyright (c) 2000 Doug Rabson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30/* __FBSDID("$FreeBSD: src/sys/boot/efi/libefi/libefi.c,v 1.6 2003/04/03 21:36:29 obrien Exp $"); */ 31 32#include <efi.h> 33#include <efilib.h> 34#include <lib/libsa/stand.h> 35#include <lib/libkern/libkern.h> 36 37#include <machine/efilib.h> 38 39EFI_HANDLE IH; 40EFI_SYSTEM_TABLE *ST; 41EFI_BOOT_SERVICES *BS; 42EFI_RUNTIME_SERVICES *RS; 43 44static EFI_PHYSICAL_ADDRESS heap; 45static UINTN heapsize; 46 47static CHAR16 * 48arg_skipsep(CHAR16 *argp) 49{ 50 51 while (*argp == ' ' || *argp == '\t') 52 argp++; 53 return (argp); 54} 55 56static CHAR16 * 57arg_skipword(CHAR16 *argp) 58{ 59 60 while (*argp && *argp != ' ' && *argp != '\t') 61 argp++; 62 return (argp); 63} 64 65void * 66efi_get_table(EFI_GUID *tbl) 67{ 68 EFI_GUID *id; 69 int i; 70 71 for (i = 0; i < ST->NumberOfTableEntries; i++) { 72 id = &ST->ConfigurationTable[i].VendorGuid; 73 if (!memcmp(id, tbl, sizeof(EFI_GUID))) 74 return (ST->ConfigurationTable[i].VendorTable); 75 } 76 return (NULL); 77} 78 79void efi_exit(EFI_STATUS exit_code) 80{ 81 82 BS->FreePages(heap, EFI_SIZE_TO_PAGES(heapsize)); 83 BS->Exit(IH, exit_code, 0, NULL); 84} 85 86void 87efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *system_table) 88{ 89 static EFI_GUID image_protocol = LOADED_IMAGE_PROTOCOL; 90 EFI_LOADED_IMAGE *img; 91 CHAR16 *argp, *args, **argv; 92 EFI_STATUS status; 93 int argc, addprog; 94 95 IH = image_handle; 96 ST = system_table; 97 BS = ST->BootServices; 98 RS = ST->RuntimeServices; 99 100 heapsize = 512*1024; 101 status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData, 102 EFI_SIZE_TO_PAGES(heapsize), &heap); 103 if (status != EFI_SUCCESS) 104 BS->Exit(IH, status, 0, NULL); 105 106 setheap((void *)heap, (void *)(heap + heapsize)); 107 108 /* Use efi_exit() from here on... */ 109 110 status = BS->HandleProtocol(IH, &image_protocol, (VOID**)&img); 111 if (status != EFI_SUCCESS) 112 efi_exit(status); 113 114 /* 115 * Pre-process the (optional) load options. If the option string 116 * is given as an ASCII string, we use a poor man's ASCII to 117 * Unicode-16 translation. The size of the option string as given 118 * to us includes the terminating null character. We assume the 119 * string is an ASCII string if strlen() plus the terminating 120 * '\0' is less than LoadOptionsSize. Even if all Unicode-16 121 * characters have the upper 8 bits non-zero, the terminating 122 * null character will cause a one-off. 123 * If the string is already in Unicode-16, we make a copy so that 124 * we know we can always modify the string. 125 */ 126 if (img->LoadOptionsSize > 0 && img->LoadOptions != NULL) { 127 if (img->LoadOptionsSize == strlen(img->LoadOptions) + 1) { 128 args = alloc(img->LoadOptionsSize << 1); 129 for (argc = 0; argc < img->LoadOptionsSize; argc++) 130 args[argc] = ((char*)img->LoadOptions)[argc]; 131 } else { 132 args = alloc(img->LoadOptionsSize); 133 memcpy(args, img->LoadOptions, img->LoadOptionsSize); 134 } 135 } else 136 args = NULL; 137 138 /* 139 * Use a quick and dirty algorithm to build the argv vector. We 140 * first count the number of words. Then, after allocating the 141 * vector, we split the string up. We don't deal with quotes or 142 * other more advanced shell features. 143 * The EFI shell will pas the name of the image as the first 144 * word in the argument list. This does not happen if we're 145 * loaded by the boot manager. This is not so easy to figure 146 * out though. The ParentHandle is not always NULL, because 147 * there can be a function (=image) that will perform the task 148 * for the boot manager. 149 */ 150 /* Part 1: Figure out if we need to add our program name. */ 151 addprog = (args == NULL || img->ParentHandle == NULL || 152 img->FilePath == NULL) ? 1 : 0; 153 if (!addprog) { 154 addprog = 155 (DevicePathType(img->FilePath) != MEDIA_DEVICE_PATH || 156 DevicePathSubType(img->FilePath) != MEDIA_FILEPATH_DP || 157 DevicePathNodeLength(img->FilePath) <= 158 sizeof(FILEPATH_DEVICE_PATH)) ? 1 : 0; 159 if (!addprog) { 160 /* XXX todo. */ 161 } 162 } 163 /* Part 2: count words. */ 164 argc = (addprog) ? 1 : 0; 165 argp = args; 166 while (argp != NULL && *argp != 0) { 167 argp = arg_skipsep(argp); 168 if (*argp == 0) 169 break; 170 argc++; 171 argp = arg_skipword(argp); 172 } 173 /* Part 3: build vector. */ 174 argv = alloc((argc + 1) * sizeof(CHAR16*)); 175 argc = 0; 176 if (addprog) 177 argv[argc++] = L"loader.efi"; 178 argp = args; 179 while (argp != NULL && *argp != 0) { 180 argp = arg_skipsep(argp); 181 if (*argp == 0) 182 break; 183 argv[argc++] = argp; 184 argp = arg_skipword(argp); 185 /* Terminate the words. */ 186 if (*argp != 0) 187 *argp++ = 0; 188 } 189 argv[argc] = NULL; 190 191 status = main(argc, argv); 192 efi_exit(status); 193} 194