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