1 /* $NetBSD: efi.c,v 1.5 2016/08/04 18:07:43 scole 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 #include <lib/libkern/libkern.h>
36
37 #include <machine/efilib.h>
38
39 EFI_HANDLE IH;
40 EFI_SYSTEM_TABLE *ST;
41 EFI_BOOT_SERVICES *BS;
42 EFI_RUNTIME_SERVICES *RS;
43
44 static EFI_PHYSICAL_ADDRESS heap;
45 static UINTN heapsize;
46
47 static CHAR16 *
arg_skipsep(CHAR16 * argp)48 arg_skipsep(CHAR16 *argp)
49 {
50
51 while (*argp == ' ' || *argp == '\t')
52 argp++;
53 return (argp);
54 }
55
56 static CHAR16 *
arg_skipword(CHAR16 * argp)57 arg_skipword(CHAR16 *argp)
58 {
59
60 while (*argp && *argp != ' ' && *argp != '\t')
61 argp++;
62 return (argp);
63 }
64
65 void *
efi_get_table(EFI_GUID * tbl)66 efi_get_table(EFI_GUID *tbl)
67 {
68 EFI_GUID *id;
69 int i;
70
71 for (i = 0; i < ST->NumberOfTableEntries; i++) {
72 id = &ST->ConfigurationTable[i].VendorGuid;
73 if (!memcmp(id, tbl, sizeof(EFI_GUID)))
74 return (ST->ConfigurationTable[i].VendorTable);
75 }
76 return (NULL);
77 }
78
efi_exit(EFI_STATUS exit_code)79 void efi_exit(EFI_STATUS exit_code)
80 {
81
82 BS->FreePages(heap, EFI_SIZE_TO_PAGES(heapsize));
83 BS->Exit(IH, exit_code, 0, NULL);
84 }
85
86 void
efi_main(EFI_HANDLE image_handle,EFI_SYSTEM_TABLE * system_table)87 efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *system_table)
88 {
89 static EFI_GUID image_protocol = LOADED_IMAGE_PROTOCOL;
90 EFI_LOADED_IMAGE *img;
91 CHAR16 *argp, *args, **argv;
92 EFI_STATUS status;
93 int argc, addprog;
94
95 IH = image_handle;
96 ST = system_table;
97 BS = ST->BootServices;
98 RS = ST->RuntimeServices;
99
100 heapsize = 512*1024;
101 status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
102 EFI_SIZE_TO_PAGES(heapsize), &heap);
103 if (status != EFI_SUCCESS)
104 BS->Exit(IH, status, 0, NULL);
105
106 setheap((void *)heap, (void *)(heap + heapsize));
107
108 /* Use efi_exit() from here on... */
109
110 status = BS->HandleProtocol(IH, &image_protocol, (VOID**)&img);
111 if (status != EFI_SUCCESS)
112 efi_exit(status);
113
114 /*
115 * Pre-process the (optional) load options. If the option string
116 * is given as an ASCII string, we use a poor man's ASCII to
117 * Unicode-16 translation. The size of the option string as given
118 * to us includes the terminating null character. We assume the
119 * string is an ASCII string if strlen() plus the terminating
120 * '\0' is less than LoadOptionsSize. Even if all Unicode-16
121 * characters have the upper 8 bits non-zero, the terminating
122 * null character will cause a one-off.
123 * If the string is already in Unicode-16, we make a copy so that
124 * we know we can always modify the string.
125 */
126 if (img->LoadOptionsSize > 0 && img->LoadOptions != NULL) {
127 if (img->LoadOptionsSize == strlen(img->LoadOptions) + 1) {
128 args = alloc(img->LoadOptionsSize << 1);
129 for (argc = 0; argc < img->LoadOptionsSize; argc++)
130 args[argc] = ((char*)img->LoadOptions)[argc];
131 } else {
132 args = alloc(img->LoadOptionsSize);
133 memcpy(args, img->LoadOptions, img->LoadOptionsSize);
134 }
135 } else
136 args = NULL;
137
138 /*
139 * Use a quick and dirty algorithm to build the argv vector. We
140 * first count the number of words. Then, after allocating the
141 * vector, we split the string up. We don't deal with quotes or
142 * other more advanced shell features.
143 * The EFI shell will pas the name of the image as the first
144 * word in the argument list. This does not happen if we're
145 * loaded by the boot manager. This is not so easy to figure
146 * out though. The ParentHandle is not always NULL, because
147 * there can be a function (=image) that will perform the task
148 * for the boot manager.
149 */
150 /* Part 1: Figure out if we need to add our program name. */
151 addprog = (args == NULL || img->ParentHandle == NULL ||
152 img->FilePath == NULL) ? 1 : 0;
153 if (!addprog) {
154 addprog =
155 (DevicePathType(img->FilePath) != MEDIA_DEVICE_PATH ||
156 DevicePathSubType(img->FilePath) != MEDIA_FILEPATH_DP ||
157 DevicePathNodeLength(img->FilePath) <=
158 sizeof(FILEPATH_DEVICE_PATH)) ? 1 : 0;
159 if (!addprog) {
160 /* XXX todo. */
161 }
162 }
163 /* Part 2: count words. */
164 argc = (addprog) ? 1 : 0;
165 argp = args;
166 while (argp != NULL && *argp != 0) {
167 argp = arg_skipsep(argp);
168 if (*argp == 0)
169 break;
170 argc++;
171 argp = arg_skipword(argp);
172 }
173 /* Part 3: build vector. */
174 argv = alloc((argc + 1) * sizeof(CHAR16*));
175 argc = 0;
176 if (addprog)
177 argv[argc++] = L"loader.efi";
178 argp = args;
179 while (argp != NULL && *argp != 0) {
180 argp = arg_skipsep(argp);
181 if (*argp == 0)
182 break;
183 argv[argc++] = argp;
184 argp = arg_skipword(argp);
185 /* Terminate the words. */
186 if (*argp != 0)
187 *argp++ = 0;
188 }
189 argv[argc] = NULL;
190
191 status = main(argc, argv);
192 efi_exit(status);
193 }
194