| 1 | #ifndef _ASM_BITOPS_H
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| 2 | #define _ASM_BITOPS_H
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| 3 |
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| 4 | /*
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| 5 | * Copyright 1992, Linus Torvalds.
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| 6 | */
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| 7 |
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| 8 | /*
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| 9 | * These have to be done with inline assembly: that way the bit-setting
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| 10 | * is guaranteed to be atomic. All bit operations return 0 if the bit
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| 11 | * was cleared before the operation and != 0 if it was not.
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| 12 | *
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| 13 | * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
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| 14 | */
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| 15 |
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| 16 | /*
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| 17 | * Function prototypes to keep gcc -Wall happy
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| 18 | */
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| 19 | #ifdef __WATCOMC__
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| 20 | int set_bit(int nr, volatile void * addr);
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| 21 | #pragma aux set_bit = \
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| 22 | "bts dword ptr [esi], eax" \
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| 23 | "setc al" \
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| 24 | "movzx eax, al" \
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| 25 | parm [eax] [esi] \
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| 26 | value [eax]
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| 27 |
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| 28 | int clear_bit(int nr, volatile void * addr);
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| 29 | #pragma aux clear_bit = \
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| 30 | "btr dword ptr [esi], eax" \
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| 31 | "setc al" \
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| 32 | "movzx eax, al" \
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| 33 | parm [eax] [esi] \
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| 34 | value [eax]
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| 35 |
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| 36 | int change_bit(int nr, volatile void * addr);
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| 37 | #pragma aux change_bit = \
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| 38 | "btc dword ptr [esi], eax" \
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| 39 | "setc al" \
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| 40 | "movzx eax, al" \
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| 41 | parm [eax] [esi] \
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| 42 | value [eax]
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| 43 |
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| 44 | #define test_and_set_bit(nr, addr) set_bit(nr, addr)
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| 45 | #define test_and_clear_bit(nr, addr) clear_bit(nr, addr)
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| 46 | #define test_and_change_bit(nr, addr) change_bit(nr, addr)
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| 47 |
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| 48 | /*
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| 49 | * ffs: find first bit set. This is defined the same way as
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| 50 | * the libc and compiler builtin ffs routines, therefore
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| 51 | * differs in spirit from the above ffz (man ffs).
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| 52 | */
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| 53 |
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| 54 | int ffs(int x);
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| 55 | #pragma aux ffs = \
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| 56 | "bsf eax, ebx" \
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| 57 | "jnz @f" \
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| 58 | "mov eax, -1" \
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| 59 | "@f:" \
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| 60 | "inc eax" \
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| 61 | parm [ebx] \
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| 62 | value [eax]
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| 63 |
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| 64 | /*
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| 65 | * ffz = Find First Zero in word. Undefined if no zero exists,
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| 66 | * so code should check against ~0UL first..
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| 67 | */
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| 68 | unsigned long ffz(unsigned long word);
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| 69 | #pragma aux ffz = \
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| 70 | "bsf eax, ebx" \
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| 71 | parm [ebx] \
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| 72 | value [eax]
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| 73 |
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| 74 | //{
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| 75 | // int r;
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| 76 | //
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| 77 | // __asm__("bsfl %1,%0\n\t"
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| 78 | // "jnz 1f\n\t"
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| 79 | // "movl $-1,%0\n"
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| 80 | // "1:" : "=r" (r) : "g" (x));
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| 81 | // return r+1;
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| 82 | //}
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| 83 |
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| 84 | #else
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| 85 | extern void set_bit(int nr, volatile void * addr);
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| 86 | extern void clear_bit(int nr, volatile void * addr);
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| 87 | extern void change_bit(int nr, volatile void * addr);
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| 88 | extern int test_and_set_bit(int nr, volatile void * addr);
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| 89 | extern int test_and_clear_bit(int nr, volatile void * addr);
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| 90 | extern int test_and_change_bit(int nr, volatile void * addr);
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| 91 | #endif
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| 92 |
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| 93 | extern int __constant_test_bit(int nr, const volatile void * addr);
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| 94 | extern int __test_bit(int nr, volatile void * addr);
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| 95 | extern int find_first_zero_bit(void * addr, unsigned size);
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| 96 | extern int find_next_zero_bit (void * addr, int size, int offset);
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| 97 |
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| 98 | /*
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| 99 | * This routine doesn't need to be atomic.
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| 100 | */
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| 101 | #define test_bit(nr, addr) (((1UL << (nr & 31)) & (((const unsigned int *) addr)[nr >> 5])) != 0)
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| 102 |
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| 103 | #endif /* _ASM_BITOPS_H */
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