2 * bitops.h --- Bitmap frobbing code. The byte swapping routines are
5 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
8 * This file may be redistributed under the terms of the GNU Public
12 * i386 bitops operations taken from <asm/bitops.h>, Copyright 1992,
17 extern int ext2fs_set_bit(unsigned int nr,void * addr);
18 extern int ext2fs_clear_bit(unsigned int nr, void * addr);
19 extern int ext2fs_test_bit(unsigned int nr, const void * addr);
20 extern void ext2fs_fast_set_bit(unsigned int nr,void * addr);
21 extern void ext2fs_fast_clear_bit(unsigned int nr, void * addr);
22 extern __u16 ext2fs_swab16(__u16 val);
23 extern __u32 ext2fs_swab32(__u32 val);
24 extern __u64 ext2fs_swab64(__u64 val);
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))
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))
51 * EXT2FS bitmap manipulation routines.
54 /* Support for sending warning messages from the inline subroutines */
55 extern const char *ext2fs_block_string;
56 extern const char *ext2fs_inode_string;
57 extern const char *ext2fs_mark_string;
58 extern const char *ext2fs_unmark_string;
59 extern const char *ext2fs_test_string;
60 extern void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg,
61 const char *description);
62 extern void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
63 int code, unsigned long arg);
65 extern int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block);
66 extern int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
68 extern int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block);
70 extern int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode);
71 extern int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
73 extern int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode);
75 extern void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
77 extern void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
79 extern int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
82 extern void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
84 extern void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
86 extern int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
88 extern blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap);
89 extern ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap);
90 extern blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap);
91 extern ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap);
93 extern void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
94 blk_t block, int num);
95 extern void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
96 blk_t block, int num);
97 extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
98 blk_t block, int num);
99 extern void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
100 blk_t block, int num);
101 extern void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
102 blk_t block, int num);
103 extern int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
104 blk_t block, int num);
105 extern void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map);
107 /* These routines moved to gen_bitmap.c */
108 extern int ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap,
110 extern int ext2fs_unmark_generic_bitmap(ext2fs_generic_bitmap bitmap,
112 extern int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
114 extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
115 blk_t block, int num);
116 extern __u32 ext2fs_get_generic_bitmap_start(ext2fs_generic_bitmap bitmap);
117 extern __u32 ext2fs_get_generic_bitmap_end(ext2fs_generic_bitmap bitmap);
120 * The inline routines themselves...
122 * If NO_INLINE_FUNCS is defined, then we won't try to do inline
123 * functions at all; they will be included as normal functions in
126 #ifdef NO_INLINE_FUNCS
127 #if (defined(__GNUC__) && (defined(__i386__) || defined(__i486__) || \
128 defined(__i586__) || defined(__mc68000__)))
129 /* This prevents bitops.c from trying to include the C */
130 /* function version of these functions */
131 #define _EXT2_HAVE_ASM_BITOPS_
133 #endif /* NO_INLINE_FUNCS */
135 #if (defined(INCLUDE_INLINE_FUNCS) || !defined(NO_INLINE_FUNCS))
136 #ifdef INCLUDE_INLINE_FUNCS
137 #define _INLINE_ extern
140 #define _INLINE_ extern __inline__
141 #else /* For Watcom C */
142 #define _INLINE_ extern inline
147 * Fast bit set/clear functions that doesn't need to return the
148 * previous bit value.
151 _INLINE_ void ext2fs_fast_set_bit(unsigned int nr,void * addr)
153 unsigned char *ADDR = (unsigned char *) addr;
156 *ADDR |= (1 << (nr & 0x07));
159 _INLINE_ void ext2fs_fast_clear_bit(unsigned int nr, void * addr)
161 unsigned char *ADDR = (unsigned char *) addr;
164 *ADDR &= ~(1 << (nr & 0x07));
168 #if ((defined __GNUC__) && !defined(_EXT2_USE_C_VERSIONS_) && \
169 (defined(__i386__) || defined(__i486__) || defined(__i586__)))
171 #define _EXT2_HAVE_ASM_BITOPS_
172 #define _EXT2_HAVE_ASM_SWAB_
173 #define _EXT2_HAVE_ASM_FINDBIT_
176 * These are done by inline assembly for speed reasons.....
178 * All bitoperations return 0 if the bit was cleared before the
179 * operation and != 0 if it was not. Bit 0 is the LSB of addr; bit 32
180 * is the LSB of (addr+1).
184 * Some hacks to defeat gcc over-optimizations..
186 struct __dummy_h { unsigned long a[100]; };
187 #define EXT2FS_ADDR (*(struct __dummy_h *) addr)
188 #define EXT2FS_CONST_ADDR (*(const struct __dummy_h *) addr)
190 _INLINE_ int ext2fs_set_bit(unsigned int nr, void * addr)
194 addr = (void *) (((unsigned char *) addr) + (nr >> 3));
195 __asm__ __volatile__("btsl %2,%1\n\tsbbl %0,%0"
196 :"=r" (oldbit),"+m" (EXT2FS_ADDR)
201 _INLINE_ int ext2fs_clear_bit(unsigned int nr, void * addr)
205 addr = (void *) (((unsigned char *) addr) + (nr >> 3));
206 __asm__ __volatile__("btrl %2,%1\n\tsbbl %0,%0"
207 :"=r" (oldbit),"+m" (EXT2FS_ADDR)
212 _INLINE_ int ext2fs_test_bit(unsigned int nr, const void * addr)
216 addr = (const void *) (((const unsigned char *) addr) + (nr >> 3));
217 __asm__ __volatile__("btl %2,%1\n\tsbbl %0,%0"
219 :"m" (EXT2FS_CONST_ADDR),"r" (nr & 7));
224 _INLINE_ int ext2fs_find_first_bit_set(void * addr, unsigned size)
231 /* This looks at memory. Mark it volatile to tell gcc not to move it around */
232 __asm__ __volatile__(
234 "xorl %%eax,%%eax\n\t"
235 "xorl %%edx,%%edx\n\t"
238 "movl -4(%%edi),%%eax\n\t"
241 "1:\tsubl %%esi,%%edi\n\t"
244 :"=d" (res), "=&c" (d0), "=&D" (d1), "=&a" (d2)
245 :"1" ((size + 31) >> 5), "2" (addr), "S" (addr));
249 _INLINE_ int ext2fs_find_next_bit_set (void * addr, int size, int offset)
251 unsigned long * p = ((unsigned long *) addr) + (offset >> 5);
252 int set = 0, bit = offset & 31, res;
256 * Look for zero in first byte
258 __asm__("bsfl %1,%0\n\t"
264 if (set < (32 - bit))
270 * No bit found yet, search remaining full bytes for a bit
272 res = ext2fs_find_first_bit_set(p, size - 32 * (p - (unsigned long *) addr));
273 return (offset + set + res);
281 #if ((defined __GNUC__) && !defined(_EXT2_USE_C_VERSIONS_) && \
282 (defined(__mc68000__)))
284 #define _EXT2_HAVE_ASM_BITOPS_
286 _INLINE_ int ext2fs_set_bit(unsigned int nr,void * addr)
290 __asm__ __volatile__ ("bfset %2@{%1:#1}; sne %0"
291 : "=d" (retval) : "d" (nr^7), "a" (addr));
296 _INLINE_ int ext2fs_clear_bit(unsigned int nr, void * addr)
300 __asm__ __volatile__ ("bfclr %2@{%1:#1}; sne %0"
301 : "=d" (retval) : "d" (nr^7), "a" (addr));
306 _INLINE_ int ext2fs_test_bit(unsigned int nr, const void * addr)
310 __asm__ __volatile__ ("bftst %2@{%1:#1}; sne %0"
311 : "=d" (retval) : "d" (nr^7), "a" (addr));
316 #endif /* __mc68000__ */
319 #if !defined(_EXT2_HAVE_ASM_SWAB_) && defined(WORDS_BIGENDIAN)
321 _INLINE_ __u16 ext2fs_swab16(__u16 val)
323 return (val >> 8) | (val << 8);
326 _INLINE_ __u32 ext2fs_swab32(__u32 val)
328 return ((val>>24) | ((val>>8)&0xFF00) |
329 ((val<<8)&0xFF0000) | (val<<24));
332 #endif /* !_EXT2_HAVE_ASM_SWAB */
334 #if !defined(_EXT2_HAVE_ASM_FINDBIT_)
336 _INLINE_ int ext2fs_find_first_bit_set(void * addr, unsigned size)
338 char *cp = (char *) addr;
344 while ((size > res) && (*cp == 0)) {
355 _INLINE_ int ext2fs_find_next_bit_set (void * addr, int size, int offset)
358 int set = 0, bit = offset & 7, res = 0, d0;
361 p = ((unsigned char *) addr) + res;
364 set = ffs(*p & ~((1 << bit) - 1));
366 return (offset & ~7) + set - 1;
370 while ((size > res) && (*p == 0)) {
378 return (res + d0 - 1);
382 _INLINE_ int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap,
385 return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
389 _INLINE_ int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
392 return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
396 _INLINE_ int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap,
399 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
403 _INLINE_ int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
406 return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
410 _INLINE_ int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
413 return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
417 _INLINE_ int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
420 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
424 _INLINE_ void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
427 ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, block);
430 _INLINE_ void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
433 ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, block);
436 _INLINE_ int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
439 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
443 _INLINE_ void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
446 ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, inode);
449 _INLINE_ void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
452 ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, inode);
455 _INLINE_ int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
458 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
462 _INLINE_ blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap)
464 return ext2fs_get_generic_bitmap_start((ext2fs_generic_bitmap) bitmap);
467 _INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap)
469 return ext2fs_get_generic_bitmap_start((ext2fs_generic_bitmap) bitmap);
472 _INLINE_ blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap)
474 return ext2fs_get_generic_bitmap_end((ext2fs_generic_bitmap) bitmap);
477 _INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap)
479 return ext2fs_get_generic_bitmap_end((ext2fs_generic_bitmap) bitmap);
482 _INLINE_ int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
483 blk_t block, int num)
485 return ext2fs_test_block_bitmap_range(bitmap, block, num);
488 _INLINE_ void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
489 blk_t block, int num)
491 ext2fs_mark_block_bitmap_range(bitmap, block, num);
494 _INLINE_ void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
495 blk_t block, int num)
497 ext2fs_unmark_block_bitmap_range(bitmap, block, num);