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 Library
9 * General Public License, version 2.
13 extern int ext2fs_set_bit(unsigned int nr,void * addr);
14 extern int ext2fs_clear_bit(unsigned int nr, void * addr);
15 extern int ext2fs_test_bit(unsigned int nr, const void * addr);
16 extern void ext2fs_fast_set_bit(unsigned int nr,void * addr);
17 extern void ext2fs_fast_clear_bit(unsigned int nr, void * addr);
18 extern __u16 ext2fs_swab16(__u16 val);
19 extern __u32 ext2fs_swab32(__u32 val);
20 extern __u64 ext2fs_swab64(__u64 val);
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))
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))
47 * EXT2FS bitmap manipulation routines.
50 /* Support for sending warning messages from the inline subroutines */
51 extern const char *ext2fs_block_string;
52 extern const char *ext2fs_inode_string;
53 extern const char *ext2fs_mark_string;
54 extern const char *ext2fs_unmark_string;
55 extern const char *ext2fs_test_string;
56 extern void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg,
57 const char *description);
58 extern void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
59 int code, unsigned long arg);
61 extern int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block);
62 extern int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
64 extern int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap, blk_t block);
66 extern int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode);
67 extern int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
69 extern int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap, ext2_ino_t inode);
71 extern void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
73 extern void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
75 extern int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
78 extern void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
80 extern void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
82 extern int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
84 extern blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap);
85 extern ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap);
86 extern blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap);
87 extern ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap);
89 extern void ext2fs_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
90 blk_t block, int num);
91 extern void ext2fs_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
92 blk_t block, int num);
93 extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
94 blk_t block, int num);
95 extern int ext2fs_test_inode_bitmap_range(ext2fs_inode_bitmap bitmap,
96 ino_t inode, int num);
97 extern void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
98 blk_t block, int num);
99 extern void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
100 blk_t block, int num);
101 extern int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
102 blk_t block, int num);
103 extern void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map);
105 /* These routines moved to gen_bitmap.c */
106 extern int ext2fs_mark_generic_bitmap(ext2fs_generic_bitmap bitmap,
108 extern int ext2fs_unmark_generic_bitmap(ext2fs_generic_bitmap bitmap,
110 extern int ext2fs_test_generic_bitmap(ext2fs_generic_bitmap bitmap,
112 extern int ext2fs_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
113 blk_t block, int num);
114 extern __u32 ext2fs_get_generic_bitmap_start(ext2fs_generic_bitmap bitmap);
115 extern __u32 ext2fs_get_generic_bitmap_end(ext2fs_generic_bitmap bitmap);
118 * The inline routines themselves...
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
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_
131 #endif /* NO_INLINE_FUNCS */
133 #if (defined(INCLUDE_INLINE_FUNCS) || !defined(NO_INLINE_FUNCS))
134 #ifdef INCLUDE_INLINE_FUNCS
135 #define _INLINE_ extern
138 #define _INLINE_ extern __inline__
139 #else /* For Watcom C */
140 #define _INLINE_ extern inline
145 * Fast bit set/clear functions that doesn't need to return the
146 * previous bit value.
149 _INLINE_ void ext2fs_fast_set_bit(unsigned int nr,void * addr)
151 unsigned char *ADDR = (unsigned char *) addr;
154 *ADDR |= (1 << (nr & 0x07));
157 _INLINE_ void ext2fs_fast_clear_bit(unsigned int nr, void * addr)
159 unsigned char *ADDR = (unsigned char *) addr;
162 *ADDR &= ~(1 << (nr & 0x07));
166 #if ((defined __GNUC__) && !defined(_EXT2_USE_C_VERSIONS_) && \
167 (defined(__i386__) || defined(__i486__) || defined(__i586__)))
169 #define _EXT2_HAVE_ASM_BITOPS_
170 #define _EXT2_HAVE_ASM_SWAB_
173 * These are done by inline assembly for speed reasons.....
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).
181 * Some hacks to defeat gcc over-optimizations..
183 struct __dummy_h { unsigned long a[100]; };
184 #define EXT2FS_ADDR (*(struct __dummy_h *) addr)
185 #define EXT2FS_CONST_ADDR (*(const struct __dummy_h *) addr)
187 _INLINE_ int ext2fs_set_bit(unsigned int nr, void * addr)
191 addr = (void *) (((unsigned char *) addr) + (nr >> 3));
192 __asm__ __volatile__("btsl %2,%1\n\tsbbl %0,%0"
193 :"=r" (oldbit),"+m" (EXT2FS_ADDR)
198 _INLINE_ int ext2fs_clear_bit(unsigned int nr, void * addr)
202 addr = (void *) (((unsigned char *) addr) + (nr >> 3));
203 __asm__ __volatile__("btrl %2,%1\n\tsbbl %0,%0"
204 :"=r" (oldbit),"+m" (EXT2FS_ADDR)
209 _INLINE_ int ext2fs_test_bit(unsigned int nr, const void * addr)
213 addr = (const void *) (((const unsigned char *) addr) + (nr >> 3));
214 __asm__ __volatile__("btl %2,%1\n\tsbbl %0,%0"
216 :"m" (EXT2FS_CONST_ADDR),"r" (nr & 7));
220 _INLINE_ __u32 ext2fs_swab32(__u32 val)
222 #ifdef EXT2FS_REQUIRE_486
223 __asm__("bswap %0" : "=r" (val) : "0" (val));
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 */
234 _INLINE_ __u16 ext2fs_swab16(__u16 val)
236 __asm__("xchgb %b0,%h0" /* swap bytes */ \
246 #if ((defined __GNUC__) && !defined(_EXT2_USE_C_VERSIONS_) && \
247 (defined(__mc68000__)))
249 #define _EXT2_HAVE_ASM_BITOPS_
251 _INLINE_ int ext2fs_set_bit(unsigned int nr,void * addr)
255 __asm__ __volatile__ ("bfset %2@{%1:#1}; sne %0"
256 : "=d" (retval) : "d" (nr^7), "a" (addr));
261 _INLINE_ int ext2fs_clear_bit(unsigned int nr, void * addr)
265 __asm__ __volatile__ ("bfclr %2@{%1:#1}; sne %0"
266 : "=d" (retval) : "d" (nr^7), "a" (addr));
271 _INLINE_ int ext2fs_test_bit(unsigned int nr, const void * addr)
275 __asm__ __volatile__ ("bftst %2@{%1:#1}; sne %0"
276 : "=d" (retval) : "d" (nr^7), "a" (addr));
281 #endif /* __mc68000__ */
284 #if !defined(_EXT2_HAVE_ASM_SWAB_)
286 _INLINE_ __u16 ext2fs_swab16(__u16 val)
288 return (val >> 8) | (val << 8);
291 _INLINE_ __u32 ext2fs_swab32(__u32 val)
293 return ((val>>24) | ((val>>8)&0xFF00) |
294 ((val<<8)&0xFF0000) | (val<<24));
297 #endif /* !_EXT2_HAVE_ASM_SWAB */
299 _INLINE_ __u64 ext2fs_swab64(__u64 val)
301 return (ext2fs_swab32(val >> 32) |
302 (((__u64)ext2fs_swab32(val & 0xFFFFFFFFUL)) << 32));
305 _INLINE_ int ext2fs_mark_block_bitmap(ext2fs_block_bitmap bitmap,
308 return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
312 _INLINE_ int ext2fs_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
315 return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
319 _INLINE_ int ext2fs_test_block_bitmap(ext2fs_block_bitmap bitmap,
322 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
326 _INLINE_ int ext2fs_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
329 return ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
333 _INLINE_ int ext2fs_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
336 return ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap,
340 _INLINE_ int ext2fs_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
343 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
347 _INLINE_ void ext2fs_fast_mark_block_bitmap(ext2fs_block_bitmap bitmap,
350 ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, block);
353 _INLINE_ void ext2fs_fast_unmark_block_bitmap(ext2fs_block_bitmap bitmap,
356 ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, block);
359 _INLINE_ int ext2fs_fast_test_block_bitmap(ext2fs_block_bitmap bitmap,
362 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
366 _INLINE_ void ext2fs_fast_mark_inode_bitmap(ext2fs_inode_bitmap bitmap,
369 ext2fs_mark_generic_bitmap((ext2fs_generic_bitmap) bitmap, inode);
372 _INLINE_ void ext2fs_fast_unmark_inode_bitmap(ext2fs_inode_bitmap bitmap,
375 ext2fs_unmark_generic_bitmap((ext2fs_generic_bitmap) bitmap, inode);
378 _INLINE_ int ext2fs_fast_test_inode_bitmap(ext2fs_inode_bitmap bitmap,
381 return ext2fs_test_generic_bitmap((ext2fs_generic_bitmap) bitmap,
385 _INLINE_ blk_t ext2fs_get_block_bitmap_start(ext2fs_block_bitmap bitmap)
387 return ext2fs_get_generic_bitmap_start((ext2fs_generic_bitmap) bitmap);
390 _INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_start(ext2fs_inode_bitmap bitmap)
392 return ext2fs_get_generic_bitmap_start((ext2fs_generic_bitmap) bitmap);
395 _INLINE_ blk_t ext2fs_get_block_bitmap_end(ext2fs_block_bitmap bitmap)
397 return ext2fs_get_generic_bitmap_end((ext2fs_generic_bitmap) bitmap);
400 _INLINE_ ext2_ino_t ext2fs_get_inode_bitmap_end(ext2fs_inode_bitmap bitmap)
402 return ext2fs_get_generic_bitmap_end((ext2fs_generic_bitmap) bitmap);
405 _INLINE_ int ext2fs_fast_test_block_bitmap_range(ext2fs_block_bitmap bitmap,
406 blk_t block, int num)
408 return ext2fs_test_block_bitmap_range(bitmap, block, num);
411 _INLINE_ void ext2fs_fast_mark_block_bitmap_range(ext2fs_block_bitmap bitmap,
412 blk_t block, int num)
414 ext2fs_mark_block_bitmap_range(bitmap, block, num);
417 _INLINE_ void ext2fs_fast_unmark_block_bitmap_range(ext2fs_block_bitmap bitmap,
418 blk_t block, int num)
420 ext2fs_unmark_block_bitmap_range(bitmap, block, num);