sys/arch/ia64/stand/efi/libefi/efifs.c

   1 /*      $NetBSD: efifs.c,v 1.3 2009/03/18 16:00:12 cegger Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2001 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  * $FreeBSD: src/sys/boot/efi/libefi/efifs.c,v 1.8 2003/08/02 08:22:03 marcel Exp $
  29  */
  30
  31 #include <sys/time.h>
  32 #include <sys/dirent.h>
  33 #include <lib/libsa/stand.h>
  34 #include <lib/libsa/loadfile.h>
  35 #include <lib/libkern/libkern.h>
  36 #include <machine/stdarg.h>
  37
  38 #include <efi.h>
  39 #include <efilib.h>
  40
  41 #include <bootstrap.h>
  42
  43 #include "efiboot.h"
  44
  45 /* Perform I/O in blocks of size EFI_BLOCK_SIZE. */
  46 #define EFI_BLOCK_SIZE  (1024 * 1024)
  47
  48
  49 int
  50 efifs_open(const char *upath, struct open_file *f)
  51 {
  52         struct efi_devdesc *dev = f->f_devdata;
  53         static EFI_GUID sfsid = SIMPLE_FILE_SYSTEM_PROTOCOL;
  54         EFI_FILE_IO_INTERFACE *sfs;
  55         EFI_FILE *root;
  56         EFI_FILE *file;
  57         EFI_STATUS status;
  58         CHAR16 *cp;
  59         CHAR16 *path;
  60
  61         /*
  62          * We cannot blindly assume that f->f_devdata points to a
  63          * efi_devdesc structure. Before we dereference 'dev', make
  64          * sure that the underlying device is ours.
  65          */
  66         if (f->f_dev != &devsw[0] || dev->d_handle == NULL)
  67                 return ENOENT;
  68
  69         status = BS->HandleProtocol(dev->d_handle, &sfsid, (VOID **)&sfs);
  70         if (EFI_ERROR(status))
  71                 return ENOENT;
  72
  73         /*
  74          * Find the root directory.
  75          */
  76         status = sfs->OpenVolume(sfs, &root);
  77
  78         /*
  79          * Convert path to CHAR16, skipping leading separators.
  80          */
  81         while (*upath == '/')
  82                 upath++;
  83         if (!*upath) {
  84                 /* Opening the root directory, */
  85                 f->f_fsdata = root;
  86                 return 0;
  87         }
  88         cp = path = alloc((strlen(upath) + 1) * sizeof(CHAR16));
  89         if (path == NULL)
  90                 return ENOMEM;
  91         while (*upath) {
  92                 if (*upath == '/')
  93                         *cp = '\\';
  94                 else
  95                         *cp = *upath;
  96                 upath++;
  97                 cp++;
  98         }
  99         *cp++ = 0;
 100
 101         /*
 102          * Try to open it.
 103          */
 104         status = root->Open(root, &file, path, EFI_FILE_MODE_READ, 0);
 105         free(path);
 106         if (EFI_ERROR(status)) {
 107                 root->Close(root);
 108                 return ENOENT;
 109         }
 110
 111         root->Close(root);
 112         f->f_fsdata = file;
 113         return 0;
 114 }
 115
 116 int
 117 efifs_close(struct open_file *f)
 118 {
 119         EFI_FILE *file = f->f_fsdata;
 120
 121         file->Close(file);
 122         return 0;
 123 }
 124
 125 int
 126 efifs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
 127 {
 128         EFI_FILE *file = f->f_fsdata;
 129         EFI_STATUS status;
 130         UINTN sz = size;
 131         char *bufp;
 132
 133         bufp = buf;
 134         while (size > 0) {
 135                 sz = size;
 136                 if (sz > EFI_BLOCK_SIZE)
 137                         sz = EFI_BLOCK_SIZE;
 138                 status = file->Read(file, &sz, bufp);
 139
 140 #if !defined(LIBSA_NO_TWIDDLE)
 141                 twiddle();
 142 #endif
 143
 144                 if (EFI_ERROR(status))
 145                         return EIO;
 146                 if (sz == 0)
 147                         break;
 148                 size -= sz;
 149                 bufp += sz;
 150         }
 151         if (resid)
 152                 *resid = size;
 153         return 0;
 154 }
 155
 156 int
 157 efifs_write(struct open_file *f, void *buf, size_t size, size_t *resid)
 158 {
 159         EFI_FILE *file = f->f_fsdata;
 160         EFI_STATUS status;
 161         UINTN sz = size;
 162         char *bufp;
 163
 164         bufp = buf;
 165         while (size > 0) {
 166                 sz = size;
 167                 if (sz > EFI_BLOCK_SIZE)
 168                         sz = EFI_BLOCK_SIZE;
 169                 status = file->Write(file, &sz, bufp);
 170
 171 #if !defined(LIBSA_NO_TWIDDLE)
 172                 twiddle();
 173 #endif
 174
 175                 if (EFI_ERROR(status))
 176                         return EIO;
 177                 if (sz == 0)
 178                         break;
 179                 size -= sz;
 180                 bufp += sz;
 181         }
 182         if (resid)
 183                 *resid = size;
 184         return 0;
 185 }
 186
 187 off_t
 188 efifs_seek(struct open_file *f, off_t offset, int where)
 189 {
 190         EFI_FILE *file = f->f_fsdata;
 191         EFI_STATUS status;
 192         UINT64 base;
 193         UINTN sz;
 194         static EFI_GUID infoid = EFI_FILE_INFO_ID;
 195         EFI_FILE_INFO info;
 196
 197         switch (where) {
 198         case SEEK_SET:
 199                 base = 0;
 200                 break;
 201
 202         case SEEK_CUR:
 203                 status = file->GetPosition(file, &base);
 204                 if (EFI_ERROR(status))
 205                         return -1;
 206                 break;
 207
 208         case SEEK_END:
 209                 sz = sizeof(info);
 210                 status = file->GetInfo(file, &infoid, &sz, &info);
 211                 if (EFI_ERROR(status))
 212                         return -1;
 213                 base = info.FileSize;
 214                 break;
 215         }
 216
 217         status = file->SetPosition(file, base + offset);
 218         if (EFI_ERROR(status))
 219                 return -1;
 220         file->GetPosition(file, &base);
 221
 222         return base;
 223 }
 224
 225 int
 226 efifs_stat(struct open_file *f, struct stat *sb)
 227 {
 228         EFI_FILE *file = f->f_fsdata;
 229         EFI_STATUS status;
 230         char *buf;
 231         UINTN sz;
 232         static EFI_GUID infoid = EFI_FILE_INFO_ID;
 233         EFI_FILE_INFO *info;
 234
 235         memset(sb, 0, sizeof(*sb));
 236
 237         buf = alloc(1024);
 238         sz = 1024;
 239
 240         status = file->GetInfo(file, &infoid, &sz, buf);
 241         if (EFI_ERROR(status)) {
 242                 free(buf);
 243                 return -1;
 244         }
 245
 246         info = (EFI_FILE_INFO *) buf;
 247
 248         if (info->Attribute & EFI_FILE_READ_ONLY)
 249                 sb->st_mode = S_IRUSR;
 250         else
 251                 sb->st_mode = S_IRUSR | S_IWUSR;
 252         if (info->Attribute & EFI_FILE_DIRECTORY)
 253                 sb->st_mode |= S_IFDIR;
 254         else
 255                 sb->st_mode |= S_IFREG;
 256         sb->st_size = info->FileSize;
 257
 258         free(buf);
 259         return 0;
 260 }
 261
 262 int
 263 efifs_readdir(struct open_file *f, struct dirent *d)
 264 {
 265         EFI_FILE *file = f->f_fsdata;
 266         EFI_STATUS status;
 267         char *buf;
 268         UINTN sz;
 269         EFI_FILE_INFO *info;
 270         int i;
 271
 272         buf = alloc(1024);
 273         sz = 1024;
 274
 275         status = file->Read(file, &sz, buf);
 276         if (EFI_ERROR(status) || sz < offsetof(EFI_FILE_INFO, FileName))
 277             return ENOENT;
 278
 279         info = (EFI_FILE_INFO *) buf;
 280
 281         d->d_fileno = 0;
 282         d->d_reclen = sizeof(*d);
 283         if (info->Attribute & EFI_FILE_DIRECTORY)
 284                 d->d_type = DT_DIR;
 285         else
 286                 d->d_type = DT_REG;
 287         d->d_namlen = ((info->Size - offsetof(EFI_FILE_INFO, FileName))
 288                        / sizeof(CHAR16));
 289         for (i = 0; i < d->d_namlen; i++)
 290                 d->d_name[i] = info->FileName[i];
 291         d->d_name[i] = 0;
 292
 293         free(buf);
 294         return 0;
 295 }
 296
 297 static EFI_HANDLE *fs_handles;
 298 UINTN fs_handle_count;
 299
 300 int
 301 efifs_get_unit(EFI_HANDLE h)
 302 {
 303         UINTN u;
 304
 305         u = 0;
 306         while (u < fs_handle_count && fs_handles[u] != h)
 307                 u++;
 308         return ((u < fs_handle_count) ? u : -1);
 309 }
 310
 311 int
 312 efifs_dev_init(void)
 313 {
 314         EFI_STATUS      status;
 315         UINTN           sz;
 316         static EFI_GUID sfsid = SIMPLE_FILE_SYSTEM_PROTOCOL;
 317
 318         sz = 0;
 319         status = BS->LocateHandle(ByProtocol, &sfsid, 0, &sz, 0);
 320         if (status != EFI_BUFFER_TOO_SMALL)
 321                 return ENOENT;
 322         fs_handles = (EFI_HANDLE *) alloc(sz);
 323         status = BS->LocateHandle(ByProtocol, &sfsid, 0,
 324                                   &sz, fs_handles);
 325         if (EFI_ERROR(status)) {
 326                 free(fs_handles);
 327                 return ENOENT;
 328         }
 329         fs_handle_count = sz / sizeof(EFI_HANDLE);
 330
 331         return 0;
 332 }
 333
 334 /*
 335  * Print information about disks
 336  */
 337 void
 338 efifs_dev_print(int verbose)
 339 {
 340         int             i;
 341         char            line[80];
 342
 343         for (i = 0; i < fs_handle_count; i++) {
 344                 sprintf(line, "    fs%d:   EFI filesystem", i);
 345                 pager_output(line);
 346                 /* XXX more detail? */
 347                 pager_output("\n");
 348         }
 349 }
 350
 351 /*
 352  * Attempt to open the disk described by (dev) for use by (f).
 353  *
 354  * Note that the philosophy here is "give them exactly what
 355  * they ask for".  This is necessary because being too "smart"
 356  * about what the user might want leads to complications.
 357  * (eg. given no slice or partition value, with a disk that is
 358  *  sliced - are they after the first BSD slice, or the DOS
 359  *  slice before it?)
 360  */
 361 int
 362 efifs_dev_open(struct open_file *f, ...)
 363 {
 364         va_list                 args;
 365         struct efi_devdesc      *dev;
 366         int                     unit;
 367
 368         va_start(args, f);
 369         dev = va_arg(args, struct efi_devdesc*);
 370         va_end(args);
 371
 372         unit = dev->d_kind.efidisk.unit;
 373         if (unit < 0 || unit >= fs_handle_count) {
 374                 printf("attempt to open nonexistent EFI filesystem\n");
 375                 return(ENXIO);
 376         }
 377
 378         dev->d_handle = fs_handles[unit];
 379
 380         return 0;
 381 }
 382
 383 int
 384 efifs_dev_close(struct open_file *f)
 385 {
 386
 387         return 0;
 388 }
 389
 390 int
 391 efifs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, void *buf, size_t *rsize)
 392 {
 393         return 0;
 394 }
 395