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      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 *
     48 arg_skipsep(CHAR16 *argp)
     49 {
     50 
     51 	while (*argp == ' ' || *argp == '\t')
     52 		argp++;
     53 	return (argp);
     54 }
     55 
     56 static CHAR16 *
     57 arg_skipword(CHAR16 *argp)
     58 {
     59 
     60 	while (*argp && *argp != ' ' && *argp != '\t')
     61 		argp++;
     62 	return (argp);
     63 }
     64 
     65 void *
     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 
     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
     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