efi.c revision 1.1
1 /* $NetBSD: efi.c,v 1.1 2006/04/07 14:21:32 cherry 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 31 #include <efi.h> 32 #include <efilib.h> 33 #include <lib/libsa/stand.h> 34 35 EFI_HANDLE IH; 36 EFI_SYSTEM_TABLE *ST; 37 EFI_BOOT_SERVICES *BS; 38 EFI_RUNTIME_SERVICES *RS; 39 40 static EFI_PHYSICAL_ADDRESS heap; 41 static UINTN heapsize; 42 43 static CHAR16 * 44 arg_skipsep(CHAR16 *argp) 45 { 46 47 while (*argp == ' ' || *argp == '\t') 48 argp++; 49 return (argp); 50 } 51 52 static CHAR16 * 53 arg_skipword(CHAR16 *argp) 54 { 55 56 while (*argp && *argp != ' ' && *argp != '\t') 57 argp++; 58 return (argp); 59 } 60 61 void * 62 efi_get_table(EFI_GUID *tbl) 63 { 64 EFI_GUID *id; 65 int i; 66 67 for (i = 0; i < ST->NumberOfTableEntries; i++) { 68 id = &ST->ConfigurationTable[i].VendorGuid; 69 if (!memcmp(id, tbl, sizeof(EFI_GUID))) 70 return (ST->ConfigurationTable[i].VendorTable); 71 } 72 return (NULL); 73 } 74 75 void efi_exit(EFI_STATUS exit_code) 76 { 77 78 BS->FreePages(heap, EFI_SIZE_TO_PAGES(heapsize)); 79 BS->Exit(IH, exit_code, 0, NULL); 80 } 81 82 void 83 efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *system_table) 84 { 85 static EFI_GUID image_protocol = LOADED_IMAGE_PROTOCOL; 86 EFI_LOADED_IMAGE *img; 87 CHAR16 *argp, *args, **argv; 88 EFI_STATUS status; 89 int argc, addprog; 90 91 IH = image_handle; 92 ST = system_table; 93 BS = ST->BootServices; 94 RS = ST->RuntimeServices; 95 96 heapsize = 512*1024; 97 status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData, 98 EFI_SIZE_TO_PAGES(heapsize), &heap); 99 if (status != EFI_SUCCESS) 100 BS->Exit(IH, status, 0, NULL); 101 102 setheap((void *)heap, (void *)(heap + heapsize)); 103 104 /* Use efi_exit() from here on... */ 105 106 status = BS->HandleProtocol(IH, &image_protocol, (VOID**)&img); 107 if (status != EFI_SUCCESS) 108 efi_exit(status); 109 110 /* 111 * Pre-process the (optional) load options. If the option string 112 * is given as an ASCII string, we use a poor man's ASCII to 113 * Unicode-16 translation. The size of the option string as given 114 * to us includes the terminating null character. We assume the 115 * string is an ASCII string if strlen() plus the terminating 116 * '\0' is less than LoadOptionsSize. Even if all Unicode-16 117 * characters have the upper 8 bits non-zero, the terminating 118 * null character will cause a one-off. 119 * If the string is already in Unicode-16, we make a copy so that 120 * we know we can always modify the string. 121 */ 122 if (img->LoadOptionsSize > 0 && img->LoadOptions != NULL) { 123 if (img->LoadOptionsSize == strlen(img->LoadOptions) + 1) { 124 args = alloc(img->LoadOptionsSize << 1); 125 for (argc = 0; argc < img->LoadOptionsSize; argc++) 126 args[argc] = ((char*)img->LoadOptions)[argc]; 127 } else { 128 args = alloc(img->LoadOptionsSize); 129 memcpy(args, img->LoadOptions, img->LoadOptionsSize); 130 } 131 } else 132 args = NULL; 133 134 /* 135 * Use a quick and dirty algorithm to build the argv vector. We 136 * first count the number of words. Then, after allocating the 137 * vector, we split the string up. We don't deal with quotes or 138 * other more advanced shell features. 139 * The EFI shell will pas the name of the image as the first 140 * word in the argument list. This does not happen if we're 141 * loaded by the boot manager. This is not so easy to figure 142 * out though. The ParentHandle is not always NULL, because 143 * there can be a function (=image) that will perform the task 144 * for the boot manager. 145 */ 146 /* Part 1: Figure out if we need to add our program name. */ 147 addprog = (args == NULL || img->ParentHandle == NULL || 148 img->FilePath == NULL) ? 1 : 0; 149 if (!addprog) { 150 addprog = 151 (DevicePathType(img->FilePath) != MEDIA_DEVICE_PATH || 152 DevicePathSubType(img->FilePath) != MEDIA_FILEPATH_DP || 153 DevicePathNodeLength(img->FilePath) <= 154 sizeof(FILEPATH_DEVICE_PATH)) ? 1 : 0; 155 if (!addprog) { 156 /* XXX todo. */ 157 } 158 } 159 /* Part 2: count words. */ 160 argc = (addprog) ? 1 : 0; 161 argp = args; 162 while (argp != NULL && *argp != 0) { 163 argp = arg_skipsep(argp); 164 if (*argp == 0) 165 break; 166 argc++; 167 argp = arg_skipword(argp); 168 } 169 /* Part 3: build vector. */ 170 argv = alloc((argc + 1) * sizeof(CHAR16*)); 171 argc = 0; 172 if (addprog) 173 argv[argc++] = L"loader.efi"; 174 argp = args; 175 while (argp != NULL && *argp != 0) { 176 argp = arg_skipsep(argp); 177 if (*argp == 0) 178 break; 179 argv[argc++] = argp; 180 argp = arg_skipword(argp); 181 /* Terminate the words. */ 182 if (*argp != 0) 183 *argp++ = 0; 184 } 185 argv[argc] = NULL; 186 187 status = main(argc, argv); 188 efi_exit(status); 189 } 190
Indexes created Mon Sep 29 21:09:56 GMT 2025