1/* 2 * bitops.h --- Bitmap frobbing code. The byte swapping routines are 3 * also included here. 4 * 5 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o. 6 * 7 * %Begin-Header% 8 * This file may be redistributed under the terms of the GNU Library 9 * General Public License, version 2. 10 * %End-Header% 11 */ 12 13extern int ext2fs_set_bit(unsigned int nr,void * addr); 14extern int ext2fs_clear_bit(unsigned int nr, void * addr); 15extern int ext2fs_test_bit(unsigned int nr, const void * addr); 16extern void ext2fs_fast_set_bit(unsigned int nr,void * addr); 17extern void ext2fs_fast_clear_bit(unsigned int nr, void * addr); 18extern __u16 ext2fs_swab16(__u16 val); 19extern __u32 ext2fs_swab32(__u32 val); 20extern __u64 ext2fs_swab64(__u64 val); 21 22#ifdef WORDS_BIGENDIAN 23#define ext2fs_cpu_to_le64(x) ext2fs_swab64((x)) 24#define ext2fs_le64_to_cpu(x) ext2fs_swab64((x)) 25#define ext2fs_cpu_to_le32(x) ext2fs_swab32((x)) 26#define ext2fs_le32_to_cpu(x) ext2fs_swab32((x)) 27#define ext2fs_cpu_to_le16(x) ext2fs_swab16((x)) 28#define ext2fs_le16_to_cpu(x) ext2fs_swab16((x)) 29#define ext2fs_cpu_to_be32(x) ((__u32)(x)) 30#define ext2fs_be32_to_cpu(x) ((__u32)(x)) 31#define ext2fs_cpu_to_be16(x) ((__u16)(x)) 32#define ext2fs_be16_to_cpu(x) ((__u16)(x)) 33#else 34#define ext2fs_cpu_to_le64(x) ((__u64)(x)) 35#define ext2fs_le64_to_cpu(x) ((__u64)(x)) 36#define ext2fs_cpu_to_le32(x) ((__u32)(x)) 37#define ext2fs_le32_to_cpu(x) ((__u32)(x)) 38#define ext2fs_cpu_to_le16(x) ((__u16)(x)) 39#define ext2fs_le16_to_cpu(x) ((__u16)(x)) 40#define ext2fs_cpu_to_be32(x) ext2fs_swab32((x)) 41#define ext2fs_be32_to_cpu(x) ext2fs_swab32((x)) 42#define ext2fs_cpu_to_be16(x) ext2fs_swab16((x)) 43#define ext2fs_be16_to_cpu(x) ext2fs_swab16((x)) 44#endif 45 46/* 47 * EXT2FS bitmap manipulation routines. 48 */ 49 50/* Support for sending warning messages from the inline subroutines */ 51extern const char *ext2fs_block_string; 52extern const char *ext2fs_inode_string; 53extern const char *ext2fs_mark_string; 54extern const char *ext2fs_unmark_string; 55extern const char *ext2fs_test_string; 56extern void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg, 57 const char *description); 58extern void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap, 59 int code, unsigned long arg); 60 61extern int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block); 62extern int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 63 blk_t block); 64extern int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block); 65 66extern int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode); 67extern int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 68 ext2_ino_t inode); 69extern int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode); 70 71extern void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap, 72 blk_t block); 73extern void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 74 blk_t block); 75extern int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap, 76 blk_t block); 77 78extern void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, 79 ext2_ino_t inode); 80extern void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 81 ext2_ino_t inode); 82extern int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap, 83 ext2_ino_t inode); 84extern blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap); 85extern ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap); 86extern blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap); 87extern ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap); 88 89extern void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap, 90 blk_t block, int num); 91extern void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap, 92 blk_t block, int num); 93extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 94 blk_t block, int num); 95extern int ext2fs_test_inode_bitmap_range(ext2fs_inode_bitmap bitmap, 96 ino_t inode, int num); 97extern void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap, 98 blk_t block, int num); 99extern void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap, 100 blk_t block, int num); 101extern int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 102 blk_t block, int num); 103extern void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map); 104 105/* These routines moved to gen_bitmap.c */ 106extern int ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap, 107 __u32 bitno); 108extern int ext2fs_unmark_generic_bitmap(ext2fs_generic_bitmap bitmap, 109 blk_t bitno); 110extern int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap, 111 blk_t bitno); 112extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 113 blk_t block, int num); 114extern __u32 ext2fs_get_generic_bitmap_start(ext2fs_generic_bitmap bitmap); 115extern __u32 ext2fs_get_generic_bitmap_end(ext2fs_generic_bitmap bitmap); 116 117/* 118 * The inline routines themselves... 119 * 120 * If NO_INLINE_FUNCS is defined, then we won't try to do inline 121 * functions at all; they will be included as normal functions in 122 * inline.c 123 */ 124#ifdef NO_INLINE_FUNCS 125#if (defined(__GNUC__) && (defined(__i386__) || defined(__i486__) || \ 126 defined(__i586__) || defined(__mc68000__))) 127 /* This prevents bitops.c from trying to include the C */ 128 /* function version of these functions */ 129#define _EXT2_HAVE_ASM_BITOPS_ 130#endif 131#endif /* NO_INLINE_FUNCS */ 132 133#if (defined(INCLUDE_INLINE_FUNCS) || !defined(NO_INLINE_FUNCS)) 134#ifdef INCLUDE_INLINE_FUNCS 135#define _INLINE_ extern 136#else 137#ifdef __GNUC__ 138#define _INLINE_ extern __inline__ 139#else /* For Watcom C */ 140#define _INLINE_ extern inline 141#endif 142#endif 143 144/* 145 * Fast bit set/clear functions that doesn't need to return the 146 * previous bit value. 147 */ 148 149_INLINE_ void ext2fs_fast_set_bit(unsigned int nr,void * addr) 150{ 151 unsigned char *ADDR = (unsigned char *) addr; 152 153 ADDR += nr >> 3; 154 *ADDR |= (1 << (nr & 0x07)); 155} 156 157_INLINE_ void ext2fs_fast_clear_bit(unsigned int nr, void * addr) 158{ 159 unsigned char *ADDR = (unsigned char *) addr; 160 161 ADDR += nr >> 3; 162 *ADDR &= ~(1 << (nr & 0x07)); 163} 164 165 166#if ((defined __GNUC__) && !defined(_EXT2_USE_C_VERSIONS_) && \ 167 (defined(__i386__) || defined(__i486__) || defined(__i586__))) 168 169#define _EXT2_HAVE_ASM_BITOPS_ 170#define _EXT2_HAVE_ASM_SWAB_ 171 172/* 173 * These are done by inline assembly for speed reasons..... 174 * 175 * All bitoperations return 0 if the bit was cleared before the 176 * operation and != 0 if it was not. Bit 0 is the LSB of addr; bit 32 177 * is the LSB of (addr+1). 178 */ 179 180/* 181 * Some hacks to defeat gcc over-optimizations.. 182 */ 183struct __dummy_h { unsigned long a[100]; }; 184#define EXT2FS_ADDR (*(struct __dummy_h *) addr) 185#define EXT2FS_CONST_ADDR (*(const struct __dummy_h *) addr) 186 187_INLINE_ int ext2fs_set_bit(unsigned int nr, void * addr) 188{ 189 int oldbit; 190 191 addr = (void *) (((unsigned char *) addr) + (nr >> 3)); 192 __asm__ __volatile__("btsl %2,%1\n\tsbbl %0,%0" 193 :"=r" (oldbit),"+m" (EXT2FS_ADDR) 194 :"r" (nr & 7)); 195 return oldbit; 196} 197 198_INLINE_ int ext2fs_clear_bit(unsigned int nr, void * addr) 199{ 200 int oldbit; 201 202 addr = (void *) (((unsigned char *) addr) + (nr >> 3)); 203 __asm__ __volatile__("btrl %2,%1\n\tsbbl %0,%0" 204 :"=r" (oldbit),"+m" (EXT2FS_ADDR) 205 :"r" (nr & 7)); 206 return oldbit; 207} 208 209_INLINE_ int ext2fs_test_bit(unsigned int nr, const void * addr) 210{ 211 int oldbit; 212 213 addr = (const void *) (((const unsigned char *) addr) + (nr >> 3)); 214 __asm__ __volatile__("btl %2,%1\n\tsbbl %0,%0" 215 :"=r" (oldbit) 216 :"m" (EXT2FS_CONST_ADDR),"r" (nr & 7)); 217 return oldbit; 218} 219 220_INLINE_ __u32 ext2fs_swab32(__u32 val) 221{ 222#ifdef EXT2FS_REQUIRE_486 223 __asm__("bswap %0" : "=r" (val) : "0" (val)); 224#else 225 __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ 226 "rorl $16,%0\n\t" /* swap words */ 227 "xchgb %b0,%h0" /* swap higher bytes */ 228 :"=q" (val) 229 : "0" (val)); 230#endif 231 return val; 232} 233 234_INLINE_ __u16 ext2fs_swab16(__u16 val) 235{ 236 __asm__("xchgb %b0,%h0" /* swap bytes */ \ 237 : "=q" (val) \ 238 : "0" (val)); \ 239 return val; 240} 241 242#undef EXT2FS_ADDR 243 244#endif /* i386 */ 245 246#if ((defined __GNUC__) && !defined(_EXT2_USE_C_VERSIONS_) && \ 247 (defined(__mc68000__))) 248 249#define _EXT2_HAVE_ASM_BITOPS_ 250 251_INLINE_ int ext2fs_set_bit(unsigned int nr,void * addr) 252{ 253 char retval; 254 255 __asm__ __volatile__ ("bfset %2@{%1:#1}; sne %0" 256 : "=d" (retval) : "d" (nr^7), "a" (addr)); 257 258 return retval; 259} 260 261_INLINE_ int ext2fs_clear_bit(unsigned int nr, void * addr) 262{ 263 char retval; 264 265 __asm__ __volatile__ ("bfclr %2@{%1:#1}; sne %0" 266 : "=d" (retval) : "d" (nr^7), "a" (addr)); 267 268 return retval; 269} 270 271_INLINE_ int ext2fs_test_bit(unsigned int nr, const void * addr) 272{ 273 char retval; 274 275 __asm__ __volatile__ ("bftst %2@{%1:#1}; sne %0" 276 : "=d" (retval) : "d" (nr^7), "a" (addr)); 277 278 return retval; 279} 280 281#endif /* __mc68000__ */ 282 283 284#if !defined(_EXT2_HAVE_ASM_SWAB_) 285 286_INLINE_ __u16 ext2fs_swab16(__u16 val) 287{ 288 return (val >> 8) | (val << 8); 289} 290 291_INLINE_ __u32 ext2fs_swab32(__u32 val) 292{ 293 return ((val>>24) | ((val>>8)&0xFF00) | 294 ((val<<8)&0xFF0000) | (val<<24)); 295} 296 297#endif /* !_EXT2_HAVE_ASM_SWAB */ 298 299_INLINE_ __u64 ext2fs_swab64(__u64 val) 300{ 301 return (ext2fs_swab32(val >> 32) | 302 (((__u64)ext2fs_swab32(val & 0xFFFFFFFFUL)) << 32)); 303} 304 305_INLINE_ int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap, 306 blk_t block) 307{ 308 return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, 309 block); 310} 311 312_INLINE_ int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 313 blk_t block) 314{ 315 return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, 316 block); 317} 318 319_INLINE_ int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap, 320 blk_t block) 321{ 322 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap, 323 block); 324} 325 326_INLINE_ int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, 327 ext2_ino_t inode) 328{ 329 return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, 330 inode); 331} 332 333_INLINE_ int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 334 ext2_ino_t inode) 335{ 336 return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, 337 inode); 338} 339 340_INLINE_ int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, 341 ext2_ino_t inode) 342{ 343 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap, 344 inode); 345} 346 347_INLINE_ void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap, 348 blk_t block) 349{ 350 ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, block); 351} 352 353_INLINE_ void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 354 blk_t block) 355{ 356 ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, block); 357} 358 359_INLINE_ int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap, 360 blk_t block) 361{ 362 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap, 363 block); 364} 365 366_INLINE_ void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, 367 ext2_ino_t inode) 368{ 369 ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, inode); 370} 371 372_INLINE_ void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 373 ext2_ino_t inode) 374{ 375 ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, inode); 376} 377 378_INLINE_ int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap, 379 ext2_ino_t inode) 380{ 381 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap, 382 inode); 383} 384 385_INLINE_ blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap) 386{ 387 return ext2fs_get_generic_bitmap_start((ext2fs_generic_bitmap) bitmap); 388} 389 390_INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap) 391{ 392 return ext2fs_get_generic_bitmap_start((ext2fs_generic_bitmap) bitmap); 393} 394 395_INLINE_ blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap) 396{ 397 return ext2fs_get_generic_bitmap_end((ext2fs_generic_bitmap) bitmap); 398} 399 400_INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap) 401{ 402 return ext2fs_get_generic_bitmap_end((ext2fs_generic_bitmap) bitmap); 403} 404 405_INLINE_ int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 406 blk_t block, int num) 407{ 408 return ext2fs_test_block_bitmap_range(bitmap, block, num); 409} 410 411_INLINE_ void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap, 412 blk_t block, int num) 413{ 414 ext2fs_mark_block_bitmap_range(bitmap, block, num); 415} 416 417_INLINE_ void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap, 418 blk_t block, int num) 419{ 420 ext2fs_unmark_block_bitmap_range(bitmap, block, num); 421} 422#undef _INLINE_ 423#endif 424 425