bitops.h revision ef1a526dfbe663bb80ab75c2e7985ae8d9021b76
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 Public 9 * License. 10 * %End-Header% 11 * 12 * i386 bitops operations taken from <asm/bitops.h>, Copyright 1992, 13 * Linus Torvalds. 14 */ 15 16 17extern int ext2fs_set_bit(unsigned int nr,void * addr); 18extern int ext2fs_clear_bit(unsigned int nr, void * addr); 19extern int ext2fs_test_bit(unsigned int nr, const void * addr); 20extern void ext2fs_fast_set_bit(unsigned int nr,void * addr); 21extern void ext2fs_fast_clear_bit(unsigned int nr, void * addr); 22extern __u16 ext2fs_swab16(__u16 val); 23extern __u32 ext2fs_swab32(__u32 val); 24extern __u64 ext2fs_swab64(__u64 val); 25 26#ifdef WORDS_BIGENDIAN 27#define ext2fs_cpu_to_le64(x) ext2fs_swab64((x)) 28#define ext2fs_le64_to_cpu(x) ext2fs_swab64((x)) 29#define ext2fs_cpu_to_le32(x) ext2fs_swab32((x)) 30#define ext2fs_le32_to_cpu(x) ext2fs_swab32((x)) 31#define ext2fs_cpu_to_le16(x) ext2fs_swab16((x)) 32#define ext2fs_le16_to_cpu(x) ext2fs_swab16((x)) 33#define ext2fs_cpu_to_be32(x) ((__u32)(x)) 34#define ext2fs_be32_to_cpu(x) ((__u32)(x)) 35#define ext2fs_cpu_to_be16(x) ((__u16)(x)) 36#define ext2fs_be16_to_cpu(x) ((__u16)(x)) 37#else 38#define ext2fs_cpu_to_le64(x) ((__u64)(x)) 39#define ext2fs_le64_to_cpu(x) ((__u64)(x)) 40#define ext2fs_cpu_to_le32(x) ((__u32)(x)) 41#define ext2fs_le32_to_cpu(x) ((__u32)(x)) 42#define ext2fs_cpu_to_le16(x) ((__u16)(x)) 43#define ext2fs_le16_to_cpu(x) ((__u16)(x)) 44#define ext2fs_cpu_to_be32(x) ext2fs_swab32((x)) 45#define ext2fs_be32_to_cpu(x) ext2fs_swab32((x)) 46#define ext2fs_cpu_to_be16(x) ext2fs_swab16((x)) 47#define ext2fs_be16_to_cpu(x) ext2fs_swab16((x)) 48#endif 49 50/* 51 * EXT2FS bitmap manipulation routines. 52 */ 53 54/* Support for sending warning messages from the inline subroutines */ 55extern const char *ext2fs_block_string; 56extern const char *ext2fs_inode_string; 57extern const char *ext2fs_mark_string; 58extern const char *ext2fs_unmark_string; 59extern const char *ext2fs_test_string; 60extern void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg, 61 const char *description); 62extern void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap, 63 int code, unsigned long arg); 64 65extern int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block); 66extern int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 67 blk_t block); 68extern int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block); 69 70extern int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode); 71extern int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 72 ext2_ino_t inode); 73extern int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode); 74 75extern void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap, 76 blk_t block); 77extern void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 78 blk_t block); 79extern int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap, 80 blk_t block); 81 82extern void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, 83 ext2_ino_t inode); 84extern void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 85 ext2_ino_t inode); 86extern int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap, 87 ext2_ino_t inode); 88extern blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap); 89extern ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap); 90extern blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap); 91extern ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap); 92 93extern void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap, 94 blk_t block, int num); 95extern void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap, 96 blk_t block, int num); 97extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 98 blk_t block, int num); 99extern int ext2fs_test_inode_bitmap_range(ext2fs_inode_bitmap bitmap, 100 ino_t inode, int num); 101extern void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap, 102 blk_t block, int num); 103extern void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap, 104 blk_t block, int num); 105extern int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 106 blk_t block, int num); 107extern void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map); 108 109/* These routines moved to gen_bitmap.c */ 110extern int ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap, 111 __u32 bitno); 112extern int ext2fs_unmark_generic_bitmap(ext2fs_generic_bitmap bitmap, 113 blk_t bitno); 114extern int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap, 115 blk_t bitno); 116extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 117 blk_t block, int num); 118extern __u32 ext2fs_get_generic_bitmap_start(ext2fs_generic_bitmap bitmap); 119extern __u32 ext2fs_get_generic_bitmap_end(ext2fs_generic_bitmap bitmap); 120 121/* 122 * The inline routines themselves... 123 * 124 * If NO_INLINE_FUNCS is defined, then we won't try to do inline 125 * functions at all; they will be included as normal functions in 126 * inline.c 127 */ 128#ifdef NO_INLINE_FUNCS 129#if (defined(__GNUC__) && (defined(__i386__) || defined(__i486__) || \ 130 defined(__i586__) || defined(__mc68000__))) 131 /* This prevents bitops.c from trying to include the C */ 132 /* function version of these functions */ 133#define _EXT2_HAVE_ASM_BITOPS_ 134#endif 135#endif /* NO_INLINE_FUNCS */ 136 137#if (defined(INCLUDE_INLINE_FUNCS) || !defined(NO_INLINE_FUNCS)) 138#ifdef INCLUDE_INLINE_FUNCS 139#define _INLINE_ extern 140#else 141#ifdef __GNUC__ 142#define _INLINE_ extern __inline__ 143#else /* For Watcom C */ 144#define _INLINE_ extern inline 145#endif 146#endif 147 148/* 149 * Fast bit set/clear functions that doesn't need to return the 150 * previous bit value. 151 */ 152 153_INLINE_ void ext2fs_fast_set_bit(unsigned int nr,void * addr) 154{ 155 unsigned char *ADDR = (unsigned char *) addr; 156 157 ADDR += nr >> 3; 158 *ADDR |= (1 << (nr & 0x07)); 159} 160 161_INLINE_ void ext2fs_fast_clear_bit(unsigned int nr, void * addr) 162{ 163 unsigned char *ADDR = (unsigned char *) addr; 164 165 ADDR += nr >> 3; 166 *ADDR &= ~(1 << (nr & 0x07)); 167} 168 169 170#if ((defined __GNUC__) && !defined(_EXT2_USE_C_VERSIONS_) && \ 171 (defined(__i386__) || defined(__i486__) || defined(__i586__))) 172 173#define _EXT2_HAVE_ASM_BITOPS_ 174#define _EXT2_HAVE_ASM_SWAB_ 175 176/* 177 * These are done by inline assembly for speed reasons..... 178 * 179 * All bitoperations return 0 if the bit was cleared before the 180 * operation and != 0 if it was not. Bit 0 is the LSB of addr; bit 32 181 * is the LSB of (addr+1). 182 */ 183 184/* 185 * Some hacks to defeat gcc over-optimizations.. 186 */ 187struct __dummy_h { unsigned long a[100]; }; 188#define EXT2FS_ADDR (*(struct __dummy_h *) addr) 189#define EXT2FS_CONST_ADDR (*(const struct __dummy_h *) addr) 190 191_INLINE_ int ext2fs_set_bit(unsigned int nr, void * addr) 192{ 193 int oldbit; 194 195 addr = (void *) (((unsigned char *) addr) + (nr >> 3)); 196 __asm__ __volatile__("btsl %2,%1\n\tsbbl %0,%0" 197 :"=r" (oldbit),"+m" (EXT2FS_ADDR) 198 :"r" (nr & 7)); 199 return oldbit; 200} 201 202_INLINE_ int ext2fs_clear_bit(unsigned int nr, void * addr) 203{ 204 int oldbit; 205 206 addr = (void *) (((unsigned char *) addr) + (nr >> 3)); 207 __asm__ __volatile__("btrl %2,%1\n\tsbbl %0,%0" 208 :"=r" (oldbit),"+m" (EXT2FS_ADDR) 209 :"r" (nr & 7)); 210 return oldbit; 211} 212 213_INLINE_ int ext2fs_test_bit(unsigned int nr, const void * addr) 214{ 215 int oldbit; 216 217 addr = (const void *) (((const unsigned char *) addr) + (nr >> 3)); 218 __asm__ __volatile__("btl %2,%1\n\tsbbl %0,%0" 219 :"=r" (oldbit) 220 :"m" (EXT2FS_CONST_ADDR),"r" (nr & 7)); 221 return oldbit; 222} 223 224_INLINE_ __u32 ext2fs_swab32(__u32 val) 225{ 226#ifdef EXT2FS_REQUIRE_486 227 __asm__("bswap %0" : "=r" (val) : "0" (val)); 228#else 229 __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ 230 "rorl $16,%0\n\t" /* swap words */ 231 "xchgb %b0,%h0" /* swap higher bytes */ 232 :"=q" (val) 233 : "0" (val)); 234#endif 235 return val; 236} 237 238_INLINE_ __u16 ext2fs_swab16(__u16 val) 239{ 240 __asm__("xchgb %b0,%h0" /* swap bytes */ \ 241 : "=q" (val) \ 242 : "0" (val)); \ 243 return val; 244} 245 246#undef EXT2FS_ADDR 247 248#endif /* i386 */ 249 250#if ((defined __GNUC__) && !defined(_EXT2_USE_C_VERSIONS_) && \ 251 (defined(__mc68000__))) 252 253#define _EXT2_HAVE_ASM_BITOPS_ 254 255_INLINE_ int ext2fs_set_bit(unsigned int nr,void * addr) 256{ 257 char retval; 258 259 __asm__ __volatile__ ("bfset %2@{%1:#1}; sne %0" 260 : "=d" (retval) : "d" (nr^7), "a" (addr)); 261 262 return retval; 263} 264 265_INLINE_ int ext2fs_clear_bit(unsigned int nr, void * addr) 266{ 267 char retval; 268 269 __asm__ __volatile__ ("bfclr %2@{%1:#1}; sne %0" 270 : "=d" (retval) : "d" (nr^7), "a" (addr)); 271 272 return retval; 273} 274 275_INLINE_ int ext2fs_test_bit(unsigned int nr, const void * addr) 276{ 277 char retval; 278 279 __asm__ __volatile__ ("bftst %2@{%1:#1}; sne %0" 280 : "=d" (retval) : "d" (nr^7), "a" (addr)); 281 282 return retval; 283} 284 285#endif /* __mc68000__ */ 286 287 288#if !defined(_EXT2_HAVE_ASM_SWAB_) 289 290_INLINE_ __u16 ext2fs_swab16(__u16 val) 291{ 292 return (val >> 8) | (val << 8); 293} 294 295_INLINE_ __u32 ext2fs_swab32(__u32 val) 296{ 297 return ((val>>24) | ((val>>8)&0xFF00) | 298 ((val<<8)&0xFF0000) | (val<<24)); 299} 300 301#endif /* !_EXT2_HAVE_ASM_SWAB */ 302 303_INLINE_ __u64 ext2fs_swab64(__u64 val) 304{ 305 return (ext2fs_swab32(val >> 32) | 306 (((__u64)ext2fs_swab32(val & 0xFFFFFFFFUL)) << 32)); 307} 308 309_INLINE_ int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap, 310 blk_t block) 311{ 312 return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, 313 block); 314} 315 316_INLINE_ int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 317 blk_t block) 318{ 319 return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, 320 block); 321} 322 323_INLINE_ int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap, 324 blk_t block) 325{ 326 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap, 327 block); 328} 329 330_INLINE_ int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, 331 ext2_ino_t inode) 332{ 333 return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, 334 inode); 335} 336 337_INLINE_ int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 338 ext2_ino_t inode) 339{ 340 return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, 341 inode); 342} 343 344_INLINE_ int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, 345 ext2_ino_t inode) 346{ 347 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap, 348 inode); 349} 350 351_INLINE_ void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap, 352 blk_t block) 353{ 354 ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, block); 355} 356 357_INLINE_ void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap, 358 blk_t block) 359{ 360 ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, block); 361} 362 363_INLINE_ int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap, 364 blk_t block) 365{ 366 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap, 367 block); 368} 369 370_INLINE_ void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, 371 ext2_ino_t inode) 372{ 373 ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, inode); 374} 375 376_INLINE_ void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap, 377 ext2_ino_t inode) 378{ 379 ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, inode); 380} 381 382_INLINE_ int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap, 383 ext2_ino_t inode) 384{ 385 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap, 386 inode); 387} 388 389_INLINE_ blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap) 390{ 391 return ext2fs_get_generic_bitmap_start((ext2fs_generic_bitmap) bitmap); 392} 393 394_INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap) 395{ 396 return ext2fs_get_generic_bitmap_start((ext2fs_generic_bitmap) bitmap); 397} 398 399_INLINE_ blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap) 400{ 401 return ext2fs_get_generic_bitmap_end((ext2fs_generic_bitmap) bitmap); 402} 403 404_INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap) 405{ 406 return ext2fs_get_generic_bitmap_end((ext2fs_generic_bitmap) bitmap); 407} 408 409_INLINE_ int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap, 410 blk_t block, int num) 411{ 412 return ext2fs_test_block_bitmap_range(bitmap, block, num); 413} 414 415_INLINE_ void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap, 416 blk_t block, int num) 417{ 418 ext2fs_mark_block_bitmap_range(bitmap, block, num); 419} 420 421_INLINE_ void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap, 422 blk_t block, int num) 423{ 424 ext2fs_unmark_block_bitmap_range(bitmap, block, num); 425} 426#undef _INLINE_ 427#endif 428 429