usr/src/boot/sys/boot/efi/loader/efi_main.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
  27 #include <sys/cdefs.h>
  28
  29 #include <efi.h>
  30 #include <eficonsctl.h>
  31 #include <efilib.h>
  32 #include <stand.h>
  33
  34 static EFI_PHYSICAL_ADDRESS heap;
  35 static UINTN heapsize;
  36
  37 void
  38 efi_exit(EFI_STATUS exit_code)
  39 {
  40
  41         BS->FreePages(heap, EFI_SIZE_TO_PAGES(heapsize));
  42         BS->Exit(IH, exit_code, 0, NULL);
  43 }
  44
  45 void
  46 exit(int status)
  47 {
  48
  49         efi_exit(EFI_LOAD_ERROR);
  50 }
  51
  52 static CHAR16 *
  53 arg_skipsep(CHAR16 *argp)
  54 {
  55
  56         while (*argp == ' ' || *argp == '\t' || *argp == '\n')
  57                 argp++;
  58         return (argp);
  59 }
  60
  61 static CHAR16 *
  62 arg_skipword(CHAR16 *argp)
  63 {
  64
  65         while (*argp && *argp != ' ' && *argp != '\t' && *argp != '\n')
  66                 argp++;
  67         return (argp);
  68 }
  69
  70 EFI_STATUS
  71 efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *system_table)
  72 {
  73         static EFI_GUID image_protocol = LOADED_IMAGE_PROTOCOL;
  74         static EFI_GUID console_control_protocol =
  75             EFI_CONSOLE_CONTROL_PROTOCOL_GUID;
  76         EFI_CONSOLE_CONTROL_PROTOCOL *console_control = NULL;
  77         EFI_LOADED_IMAGE *img;
  78         CHAR16 *argp, *args, **argv;
  79         EFI_STATUS status;
  80         SIMPLE_TEXT_OUTPUT_INTERFACE *conout;
  81         UINTN i, max_dim, best_mode, cols, rows;
  82         int argc, addprog;
  83
  84         IH = image_handle;
  85         ST = system_table;
  86         BS = ST->BootServices;
  87         RS = ST->RuntimeServices;
  88
  89         status = BS->LocateProtocol(&console_control_protocol, NULL,
  90             (VOID **)&console_control);
  91         if (status == EFI_SUCCESS)
  92                 (void)console_control->SetMode(console_control,
  93                     EfiConsoleControlScreenText);
  94
  95         conout = ST->ConOut;
  96         max_dim = best_mode = 0;
  97         for (i = 0; i <= conout->Mode->MaxMode ; i++) {
  98                 status = conout->QueryMode(conout, i, &cols, &rows);
  99                 if (EFI_ERROR(status))
 100                         continue;
 101                 if (cols * rows > max_dim) {
 102                         max_dim = cols * rows;
 103                         best_mode = i;
 104                 }
 105         }
 106         if (max_dim > 0)
 107                 conout->SetMode(conout, best_mode);
 108
 109         heapsize = 64 * 1024 * 1024;
 110         /* 4GB upper limit, try to leave some space from 1MB */
 111         heap = 0x0000000100000000;
 112         status = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData,
 113             EFI_SIZE_TO_PAGES(heapsize), &heap);
 114         if (status != EFI_SUCCESS)
 115                 BS->Exit(IH, status, 0, NULL);
 116
 117         setheap((void *)(uintptr_t)heap, (void *)(uintptr_t)(heap + heapsize));
 118
 119         status = conout->QueryMode(conout, best_mode, &cols, &rows);
 120         if (EFI_ERROR(status)) {
 121                 setenv("LINES", "24", 1);
 122                 setenv("COLUMNS", "80", 1);
 123         } else {
 124                 char buf[8];
 125                 snprintf(buf, sizeof (buf), "%u", (unsigned)rows);
 126                 setenv("LINES", buf, 1);
 127                 snprintf(buf, sizeof (buf), "%u", (unsigned)cols);
 128                 setenv("COLUMNS", buf, 1);
 129         }
 130
 131         /* Use efi_exit() from here on... */
 132
 133         status = BS->HandleProtocol(IH, &image_protocol, (VOID**)&img);
 134         if (status != EFI_SUCCESS)
 135                 efi_exit(status);
 136
 137         /*
 138          * Pre-process the (optional) load options. If the option string
 139          * is given as an ASCII string, we use a poor man's ASCII to
 140          * Unicode-16 translation. The size of the option string as given
 141          * to us includes the terminating null character. We assume the
 142          * string is an ASCII string if strlen() plus the terminating
 143          * '\0' is less than LoadOptionsSize. Even if all Unicode-16
 144          * characters have the upper 8 bits non-zero, the terminating
 145          * null character will cause a one-off.
 146          * If the string is already in Unicode-16, we make a copy so that
 147          * we know we can always modify the string.
 148          */
 149         if (img->LoadOptionsSize > 0 && img->LoadOptions != NULL) {
 150                 if (img->LoadOptionsSize == strlen(img->LoadOptions) + 1) {
 151                         args = malloc(img->LoadOptionsSize << 1);
 152                         for (argc = 0; argc < (int)img->LoadOptionsSize; argc++)
 153                                 args[argc] = ((char*)img->LoadOptions)[argc];
 154                 } else {
 155                         args = malloc(img->LoadOptionsSize);
 156                         memcpy(args, img->LoadOptions, img->LoadOptionsSize);
 157                 }
 158         } else
 159                 args = NULL;
 160
 161         /*
 162          * Use a quick and dirty algorithm to build the argv vector. We
 163          * first count the number of words. Then, after allocating the
 164          * vector, we split the string up. We don't deal with quotes or
 165          * other more advanced shell features.
 166          * The EFI shell will pass the name of the image as the first
 167          * word in the argument list. This does not happen if we're
 168          * loaded by the boot manager. This is not so easy to figure
 169          * out though. The ParentHandle is not always NULL, because
 170          * there can be a function (=image) that will perform the task
 171          * for the boot manager.
 172          */
 173         /* Part 1: Figure out if we need to add our program name. */
 174         addprog = (args == NULL || img->ParentHandle == NULL ||
 175             img->FilePath == NULL) ? 1 : 0;
 176         if (!addprog) {
 177                 addprog =
 178                     (DevicePathType(img->FilePath) != MEDIA_DEVICE_PATH ||
 179                      DevicePathSubType(img->FilePath) != MEDIA_FILEPATH_DP ||
 180                      DevicePathNodeLength(img->FilePath) <=
 181                         sizeof(FILEPATH_DEVICE_PATH)) ? 1 : 0;
 182                 if (!addprog) {
 183                         /* XXX todo. */
 184                 }
 185         }
 186         /* Part 2: count words. */
 187         argc = (addprog) ? 1 : 0;
 188         argp = args;
 189         while (argp != NULL && *argp != 0) {
 190                 argp = arg_skipsep(argp);
 191                 if (*argp == 0)
 192                         break;
 193                 argc++;
 194                 argp = arg_skipword(argp);
 195         }
 196         /* Part 3: build vector. */
 197         argv = malloc((argc + 1) * sizeof(CHAR16*));
 198         argc = 0;
 199         if (addprog)
 200                 argv[argc++] = (CHAR16 *)L"loader.efi";
 201         argp = args;
 202         while (argp != NULL && *argp != 0) {
 203                 argp = arg_skipsep(argp);
 204                 if (*argp == 0)
 205                         break;
 206                 argv[argc++] = argp;
 207                 argp = arg_skipword(argp);
 208                 /* Terminate the words. */
 209                 if (*argp != 0)
 210                         *argp++ = 0;
 211         }
 212         argv[argc] = NULL;
 213
 214         status = main(argc, argv);
 215         efi_exit(status);
 216         return (status);
 217 }