1/* $NetBSD: efifile.c,v 1.5 2020/07/15 00:51:40 jmcneill Exp $ */ 2 3/*- 4 * Copyright (c) 2018 Jared McNeill <jmcneill@invisible.ca> 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 REGENTS 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 REGENTS 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/param.h> 30 31#include "efiboot.h" 32#include "efifile.h" 33 34static EFI_HANDLE *efi_vol; 35static UINTN efi_nvol; 36 37static int 38efi_file_parse(const char *fname, UINTN *pvol, const char **pfile) 39{ 40 intmax_t vol; 41 char *ep = NULL; 42 43 if (strchr(fname, ':') != NULL) { 44 if (strncasecmp(fname, "fs", 2) != 0) 45 return EINVAL; 46 vol = strtoimax(fname + 2, &ep, 10); 47 if (vol < 0 || vol >= efi_nvol || *ep != ':') 48 return ENXIO; 49 *pvol = vol; 50 *pfile = ep + 1; 51 return 0; 52 } 53 54 return EINVAL; 55} 56 57void 58efi_file_system_probe(void) 59{ 60 EFI_STATUS status; 61 62 status = LibLocateHandle(ByProtocol, &FileSystemProtocol, NULL, &efi_nvol, &efi_vol); 63 if (EFI_ERROR(status)) 64 return; 65} 66 67int 68efi_file_open(struct open_file *f, ...) 69{ 70 EFI_DEVICE_PATH *file_dp, *dp; 71 SIMPLE_READ_FILE *srf; 72 EFI_HANDLE device; 73 EFI_STATUS status; 74 UINTN vol; 75 const char *fname, *path; 76 CHAR16 *upath; 77 va_list ap; 78 size_t len; 79 int rv, n; 80 81 va_start(ap, f); 82 fname = va_arg(ap, const char *); 83 va_end(ap); 84 85 rv = efi_file_parse(fname, &vol, &path); 86 if (rv != 0) 87 return rv; 88 89 upath = NULL; 90 rv = utf8_to_ucs2(path, &upath, &len); 91 if (rv != 0) 92 return rv; 93 94 file_dp = FileDevicePath(efi_vol[vol], upath); 95 FreePool(upath); 96 if (file_dp == NULL) 97 return EINVAL; 98 99 srf = AllocatePool(sizeof(*srf)); 100 if (srf == NULL) 101 return ENOMEM; 102 103 dp = file_dp; 104 status = OpenSimpleReadFile(FALSE, NULL, 0, &dp, &device, srf); 105 FreePool(file_dp); 106 if (EFI_ERROR(status)) { 107 FreePool(srf); 108 return status == EFI_NOT_FOUND ? ENOENT : EIO; 109 } 110 111 for (n = 0; n < ndevs; n++) 112 if (strcmp(DEV_NAME(&devsw[n]), "efifile") == 0) { 113 f->f_dev = &devsw[n]; 114 break; 115 } 116 if (n == ndevs) { 117 FreePool(srf); 118 return ENXIO; 119 } 120 f->f_devdata = f; 121 f->f_fsdata = srf; 122 f->f_flags = F_NODEV | F_READ; 123 124 return 0; 125} 126 127int 128efi_file_close(struct open_file *f) 129{ 130 SIMPLE_READ_FILE *srf = f->f_fsdata; 131 132 CloseSimpleReadFile(*srf); 133 FreePool(srf); 134 135 return 0; 136} 137 138int 139efi_file_strategy(void *devdata, int rw, daddr_t dblk, size_t size, void *buf, size_t *rsize) 140{ 141 struct open_file *f = devdata; 142 SIMPLE_READ_FILE *srf = f->f_fsdata; 143 EFI_STATUS status; 144 UINTN len; 145 146 if (rw != F_READ) 147 return EROFS; 148 149 len = size; 150 status = ReadSimpleReadFile(*srf, f->f_offset, &len, buf); 151 if (EFI_ERROR(status)) 152 return EIO; 153 *rsize = len; 154 155 return 0; 156} 157 158int 159efi_file_path(EFI_DEVICE_PATH *dp, const char *fname, char *buf, size_t buflen) 160{ 161 UINTN vol; 162 int depth; 163 164 depth = efi_device_path_count(dp); 165 if (depth == 0) 166 return ENODEV; 167 168 for (vol = 0; vol < efi_nvol; vol++) { 169 if (efi_device_path_ncmp(dp, DevicePathFromHandle(efi_vol[vol]), depth) == 0) 170 break; 171 } 172 if (vol == efi_nvol) 173 return ENOENT; 174 175 snprintf(buf, buflen, "fs%u:%s", (u_int)vol, fname); 176 return 0; 177} 178