sys/boot/efi/libefi/libefi.c

   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  * $DragonFly: src/sys/boot/efi/libefi/libefi.c,v 1.1 2003/11/10 06:08:33 dillon Exp $
  27  */
  28
  29 #include <efi.h>
  30 #include <efilib.h>
  31 #include <stand.h>
  32
  33 EFI_HANDLE              IH;
  34 EFI_SYSTEM_TABLE        *ST;
  35 EFI_BOOT_SERVICES       *BS;
  36 EFI_RUNTIME_SERVICES    *RS;
  37
  38 static EFI_PHYSICAL_ADDRESS heap;
  39 static UINTN heapsize;
  40
  41 static CHAR16 *
  42 arg_skipsep(CHAR16 *argp)
  43 {
  44
  45         while (*argp == ' ' || *argp == '\t')
  46                 argp++;
  47         return (argp);
  48 }
  49
  50 static CHAR16 *
  51 arg_skipword(CHAR16 *argp)
  52 {
  53
  54         while (*argp && *argp != ' ' && *argp != '\t')
  55                 argp++;
  56         return (argp);
  57 }
  58
  59 void *
  60 efi_get_table(EFI_GUID *tbl)
  61 {
  62         EFI_GUID *id;
  63         int i;
  64
  65         for (i = 0; i < ST->NumberOfTableEntries; i++) {
  66                 id = &ST->ConfigurationTable[i].VendorGuid;
  67                 if (!memcmp(id, tbl, sizeof(EFI_GUID)))
  68                         return (ST->ConfigurationTable[i].VendorTable);
  69         }
  70         return (NULL);
  71 }
  72
  73 void exit(EFI_STATUS exit_code)
  74 {
  75
  76         BS->FreePages(heap, EFI_SIZE_TO_PAGES(heapsize));
  77         BS->Exit(IH, exit_code, 0, NULL);
  78 }
  79
  80 void
  81 efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *system_table)
  82 {
  83         static EFI_GUID image_protocol = LOADED_IMAGE_PROTOCOL;
  84         EFI_LOADED_IMAGE *img;
  85         CHAR16 *argp, *args, **argv;
  86         EFI_STATUS status;
  87         int argc, addprog;
  88
  89         IH = image_handle;
  90         ST = system_table;
  91         BS = ST->BootServices;
  92         RS = ST->RuntimeServices;
  93
  94         heapsize = 512*1024;
  95         status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
  96             EFI_SIZE_TO_PAGES(heapsize), &heap);
  97         if (status != EFI_SUCCESS)
  98                 BS->Exit(IH, status, 0, NULL);
  99
 100         setheap((void *)heap, (void *)(heap + heapsize));
 101
 102         /* Use exit() from here on... */
 103
 104         status = BS->HandleProtocol(IH, &image_protocol, (VOID**)&img);
 105         if (status != EFI_SUCCESS)
 106                 exit(status);
 107
 108         /*
 109          * Pre-process the (optional) load options. If the option string
 110          * is given as an ASCII string, we use a poor man's ASCII to
 111          * Unicode-16 translation. The size of the option string as given
 112          * to us includes the terminating null character. We assume the
 113          * string is an ASCII string if strlen() plus the terminating
 114          * '\0' is less than LoadOptionsSize. Even if all Unicode-16
 115          * characters have the upper 8 bits non-zero, the terminating
 116          * null character will cause a one-off.
 117          * If the string is already in Unicode-16, we make a copy so that
 118          * we know we can always modify the string.
 119          */
 120         if (img->LoadOptionsSize > 0 && img->LoadOptions != NULL) {
 121                 if (img->LoadOptionsSize == strlen(img->LoadOptions) + 1) {
 122                         args = malloc(img->LoadOptionsSize << 1);
 123                         for (argc = 0; argc < img->LoadOptionsSize; argc++)
 124                                 args[argc] = ((char*)img->LoadOptions)[argc];
 125                 } else {
 126                         args = malloc(img->LoadOptionsSize);
 127                         memcpy(args, img->LoadOptions, img->LoadOptionsSize);
 128                 }
 129         } else
 130                 args = NULL;
 131
 132         /*
 133          * Use a quick and dirty algorithm to build the argv vector. We
 134          * first count the number of words. Then, after allocating the
 135          * vector, we split the string up. We don't deal with quotes or
 136          * other more advanced shell features.
 137          * The EFI shell will pas the name of the image as the first
 138          * word in the argument list. This does not happen if we're
 139          * loaded by the boot manager. This is not so easy to figure
 140          * out though. The ParentHandle is not always NULL, because
 141          * there can be a function (=image) that will perform the task
 142          * for the boot manager.
 143          */
 144         /* Part 1: Figure out if we need to add our program name. */
 145         addprog = (args == NULL || img->ParentHandle == NULL ||
 146             img->FilePath == NULL) ? 1 : 0;
 147         if (!addprog) {
 148                 addprog =
 149                     (DevicePathType(img->FilePath) != MEDIA_DEVICE_PATH ||
 150                      DevicePathSubType(img->FilePath) != MEDIA_FILEPATH_DP ||
 151                      DevicePathNodeLength(img->FilePath) <=
 152                         sizeof(FILEPATH_DEVICE_PATH)) ? 1 : 0;
 153                 if (!addprog) {
 154                         /* XXX todo. */
 155                 }
 156         }
 157         /* Part 2: count words. */
 158         argc = (addprog) ? 1 : 0;
 159         argp = args;
 160         while (argp != NULL && *argp != 0) {
 161                 argp = arg_skipsep(argp);
 162                 if (*argp == 0)
 163                         break;
 164                 argc++;
 165                 argp = arg_skipword(argp);
 166         }
 167         /* Part 3: build vector. */
 168         argv = malloc((argc + 1) * sizeof(CHAR16*));
 169         argc = 0;
 170         if (addprog)
 171                 argv[argc++] = L"loader.efi";
 172         argp = args;
 173         while (argp != NULL && *argp != 0) {
 174                 argp = arg_skipsep(argp);
 175                 if (*argp == 0)
 176                         break;
 177                 argv[argc++] = argp;
 178                 argp = arg_skipword(argp);
 179                 /* Terminate the words. */
 180                 if (*argp != 0)
 181                         *argp++ = 0;
 182         }
 183         argv[argc] = NULL;
 184
 185         status = main(argc, argv);
 186         exit(status);
 187 }