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
36EFI_HANDLE		IH;
37EFI_SYSTEM_TABLE	*ST;
38EFI_BOOT_SERVICES	*BS;
39EFI_RUNTIME_SERVICES	*RS;
40
41static EFI_PHYSICAL_ADDRESS heap;
42static UINTN heapsize;
43
44static CHAR16 *
45arg_skipsep(CHAR16 *argp)
46{
47
48	while (*argp == ' ' || *argp == '\t')
49		argp++;
50	return (argp);
51}
52
53static CHAR16 *
54arg_skipword(CHAR16 *argp)
55{
56
57	while (*argp && *argp != ' ' && *argp != '\t')
58		argp++;
59	return (argp);
60}
61
62void *
63efi_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
76void 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
83void
84efi_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}
191