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
efi_exit(EFI_STATUS exit_code)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
exit(int status __unused)49 exit(int status __unused)
50 {
51
52 efi_exit(EFI_LOAD_ERROR);
53 }
54
55 static CHAR16 *
arg_skipsep(CHAR16 * argp)56 arg_skipsep(CHAR16 *argp)
57 {
58
59 while (*argp == ' ' || *argp == '\t' || *argp == '\n')
60 argp++;
61 return (argp);
62 }
63
64 static CHAR16 *
arg_skipword(CHAR16 * argp)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
efi_main(EFI_HANDLE image_handle,EFI_SYSTEM_TABLE * system_table)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