1 /* $NetBSD: efi.c,v 1.3 2006/09/21 09:58:27 kochi 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 36 EFI_HANDLE IH; 37 EFI_SYSTEM_TABLE *ST; 38 EFI_BOOT_SERVICES *BS; 39 EFI_RUNTIME_SERVICES *RS; 40 41 static EFI_PHYSICAL_ADDRESS heap; 42 static UINTN heapsize; 43 44 static CHAR16 * 45 arg_skipsep(CHAR16 *argp) 46 { 47 48 while (*argp == ' ' || *argp == '\t') 49 argp++; 50 return (argp); 51 } 52 53 static CHAR16 * 54 arg_skipword(CHAR16 *argp) 55 { 56 57 while (*argp && *argp != ' ' && *argp != '\t') 58 argp++; 59 return (argp); 60 } 61 62 void * 63 efi_get_table(EFI_GUID *tbl) 64 { 65 EFI_GUID *id; 66 int i; 67 68 for (i = 0; i < ST->NumberOfTableEntries; i++) { 69 id = &ST->ConfigurationTable[i].VendorGuid; 70 if (!memcmp(id, tbl, sizeof(EFI_GUID))) 71 return (ST->ConfigurationTable[i].VendorTable); 72 } 73 return (NULL); 74 } 75 76 void efi_exit(EFI_STATUS exit_code) 77 { 78 79 BS->FreePages(heap, EFI_SIZE_TO_PAGES(heapsize)); 80 BS->Exit(IH, exit_code, 0, NULL); 81 } 82 83 void 84 efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *system_table) 85 { 86 static EFI_GUID image_protocol = LOADED_IMAGE_PROTOCOL; 87 EFI_LOADED_IMAGE *img; 88 CHAR16 *argp, *args, **argv; 89 EFI_STATUS status; 90 int argc, addprog; 91 92 IH = image_handle; 93 ST = system_table; 94 BS = ST->BootServices; 95 RS = ST->RuntimeServices; 96 97 heapsize = 512*1024; 98 status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData, 99 EFI_SIZE_TO_PAGES(heapsize), &heap); 100 if (status != EFI_SUCCESS) 101 BS->Exit(IH, status, 0, NULL); 102 103 setheap((void *)heap, (void *)(heap + heapsize)); 104 105 /* Use efi_exit() from here on... */ 106 107 status = BS->HandleProtocol(IH, &image_protocol, (VOID**)&img); 108 if (status != EFI_SUCCESS) 109 efi_exit(status); 110 111 /* 112 * Pre-process the (optional) load options. If the option string 113 * is given as an ASCII string, we use a poor man's ASCII to 114 * Unicode-16 translation. The size of the option string as given 115 * to us includes the terminating null character. We assume the 116 * string is an ASCII string if strlen() plus the terminating 117 * '\0' is less than LoadOptionsSize. Even if all Unicode-16 118 * characters have the upper 8 bits non-zero, the terminating 119 * null character will cause a one-off. 120 * If the string is already in Unicode-16, we make a copy so that 121 * we know we can always modify the string. 122 */ 123 if (img->LoadOptionsSize > 0 && img->LoadOptions != NULL) { 124 if (img->LoadOptionsSize == strlen(img->LoadOptions) + 1) { 125 args = alloc(img->LoadOptionsSize << 1); 126 for (argc = 0; argc < img->LoadOptionsSize; argc++) 127 args[argc] = ((char*)img->LoadOptions)[argc]; 128 } else { 129 args = alloc(img->LoadOptionsSize); 130 memcpy(args, img->LoadOptions, img->LoadOptionsSize); 131 } 132 } else 133 args = NULL; 134 135 /* 136 * Use a quick and dirty algorithm to build the argv vector. We 137 * first count the number of words. Then, after allocating the 138 * vector, we split the string up. We don't deal with quotes or 139 * other more advanced shell features. 140 * The EFI shell will pas the name of the image as the first 141 * word in the argument list. This does not happen if we're 142 * loaded by the boot manager. This is not so easy to figure 143 * out though. The ParentHandle is not always NULL, because 144 * there can be a function (=image) that will perform the task 145 * for the boot manager. 146 */ 147 /* Part 1: Figure out if we need to add our program name. */ 148 addprog = (args == NULL || img->ParentHandle == NULL || 149 img->FilePath == NULL) ? 1 : 0; 150 if (!addprog) { 151 addprog = 152 (DevicePathType(img->FilePath) != MEDIA_DEVICE_PATH || 153 DevicePathSubType(img->FilePath) != MEDIA_FILEPATH_DP || 154 DevicePathNodeLength(img->FilePath) <= 155 sizeof(FILEPATH_DEVICE_PATH)) ? 1 : 0; 156 if (!addprog) { 157 /* XXX todo. */ 158 } 159 } 160 /* Part 2: count words. */ 161 argc = (addprog) ? 1 : 0; 162 argp = args; 163 while (argp != NULL && *argp != 0) { 164 argp = arg_skipsep(argp); 165 if (*argp == 0) 166 break; 167 argc++; 168 argp = arg_skipword(argp); 169 } 170 /* Part 3: build vector. */ 171 argv = alloc((argc + 1) * sizeof(CHAR16*)); 172 argc = 0; 173 if (addprog) 174 argv[argc++] = L"loader.efi"; 175 argp = args; 176 while (argp != NULL && *argp != 0) { 177 argp = arg_skipsep(argp); 178 if (*argp == 0) 179 break; 180 argv[argc++] = argp; 181 argp = arg_skipword(argp); 182 /* Terminate the words. */ 183 if (*argp != 0) 184 *argp++ = 0; 185 } 186 argv[argc] = NULL; 187 188 status = main(argc, argv); 189 efi_exit(status); 190 } 191