sys/arch/ia64/stand/efi/libefi/efi.c

   1 /*      $NetBSD: efi.c,v 1.2 2006/04/22 07:58:53 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 /* __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 }