1 /* 2 * Copyright (c) 2000 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <efi.h> 28 #include <efilib.h> 29 #include <efidevp.h> 30 #include <stand.h> 31 #include <Protocol/LoadedImage.h> 32 33 static EFI_PHYSICAL_ADDRESS heap; 34 static UINTN heapsize; 35 36 void 37 efi_exit(EFI_STATUS exit_code) 38 { 39 40 if (has_boot_services) { 41 BS->FreePages(heap, EFI_SIZE_TO_PAGES(heapsize)); 42 BS->Exit(IH, exit_code, 0, NULL); 43 } else { 44 RS->ResetSystem(EfiResetCold, EFI_SUCCESS, 0, NULL); 45 } 46 } 47 48 void 49 exit(int status __unused) 50 { 51 52 efi_exit(EFI_LOAD_ERROR); 53 } 54 55 static CHAR16 * 56 arg_skipsep(CHAR16 *argp) 57 { 58 59 while (*argp == ' ' || *argp == '\t' || *argp == '\n') 60 argp++; 61 return (argp); 62 } 63 64 static CHAR16 * 65 arg_skipword(CHAR16 *argp) 66 { 67 68 while (*argp && *argp != ' ' && *argp != '\t' && *argp != '\n') 69 argp++; 70 return (argp); 71 } 72 73 EFI_STATUS 74 efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *system_table) 75 { 76 EFI_LOADED_IMAGE_PROTOCOL *img; 77 CHAR16 *argp, *args, **argv; 78 EFI_STATUS status; 79 int argc, addprog; 80 81 IH = image_handle; 82 ST = system_table; 83 BS = ST->BootServices; 84 RS = ST->RuntimeServices; 85 86 heapsize = 64 * 1024 * 1024; 87 /* 4GB upper limit, try to leave some space from 1MB */ 88 heap = 0x0000000100000000; 89 status = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 90 EFI_SIZE_TO_PAGES(heapsize), &heap); 91 if (status != EFI_SUCCESS) 92 BS->Exit(IH, status, 0, NULL); 93 94 setheap((void *)(uintptr_t)heap, (void *)(uintptr_t)(heap + heapsize)); 95 96 /* Use efi_exit() from here on... */ 97 98 status = OpenProtocolByHandle(IH, &gEfiLoadedImageProtocolGuid, 99 (void **)&img); 100 if (status != EFI_SUCCESS) 101 efi_exit(status); 102 103 /* 104 * Pre-process the (optional) load options. If the option string 105 * is given as an ASCII string, we use a poor man's ASCII to 106 * Unicode-16 translation. The size of the option string as given 107 * to us includes the terminating null character. We assume the 108 * string is an ASCII string if strlen() plus the terminating 109 * '\0' is less than LoadOptionsSize. Even if all Unicode-16 110 * characters have the upper 8 bits non-zero, the terminating 111 * null character will cause a one-off. 112 * If the string is already in Unicode-16, we make a copy so that 113 * we know we can always modify the string. 114 */ 115 if (img->LoadOptionsSize > 0 && img->LoadOptions != NULL) { 116 if (img->LoadOptionsSize == strlen(img->LoadOptions) + 1) { 117 args = malloc(img->LoadOptionsSize << 1); 118 for (argc = 0; argc < (int)img->LoadOptionsSize; argc++) 119 args[argc] = ((char *)img->LoadOptions)[argc]; 120 } else { 121 args = malloc(img->LoadOptionsSize); 122 memcpy(args, img->LoadOptions, img->LoadOptionsSize); 123 } 124 } else 125 args = NULL; 126 127 /* 128 * Use a quick and dirty algorithm to build the argv vector. We 129 * first count the number of words. Then, after allocating the 130 * vector, we split the string up. We don't deal with quotes or 131 * other more advanced shell features. 132 * The EFI shell will pass the name of the image as the first 133 * word in the argument list. This does not happen if we're 134 * loaded by the boot manager. This is not so easy to figure 135 * out though. The ParentHandle is not always NULL, because 136 * there can be a function (=image) that will perform the task 137 * for the boot manager. 138 */ 139 /* Part 1: Figure out if we need to add our program name. */ 140 addprog = (args == NULL || img->ParentHandle == NULL || 141 img->FilePath == NULL) ? 1 : 0; 142 if (!addprog) { 143 addprog = 144 (DevicePathType(img->FilePath) != MEDIA_DEVICE_PATH || 145 DevicePathSubType(img->FilePath) != MEDIA_FILEPATH_DP || 146 DevicePathNodeLength(img->FilePath) <= 147 sizeof (FILEPATH_DEVICE_PATH)) ? 1 : 0; 148 if (!addprog) { 149 /* XXX todo. */ 150 } 151 } 152 /* Part 2: count words. */ 153 argc = (addprog) ? 1 : 0; 154 argp = args; 155 while (argp != NULL && *argp != 0) { 156 argp = arg_skipsep(argp); 157 if (*argp == 0) 158 break; 159 argc++; 160 argp = arg_skipword(argp); 161 } 162 /* Part 3: build vector. */ 163 argv = malloc((argc + 1) * sizeof (CHAR16*)); 164 argc = 0; 165 if (addprog) 166 argv[argc++] = (CHAR16 *)LOADER_EFI; 167 argp = args; 168 while (argp != NULL && *argp != 0) { 169 argp = arg_skipsep(argp); 170 if (*argp == 0) 171 break; 172 argv[argc++] = argp; 173 argp = arg_skipword(argp); 174 /* Terminate the words. */ 175 if (*argp != 0) 176 *argp++ = 0; 177 } 178 argv[argc] = NULL; 179 180 status = main(argc, argv); 181 efi_exit(status); 182 return (status); 183 } 184