195 lines
4.3 KiB
C
195 lines
4.3 KiB
C
/*
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* Copyright 1995, Russell King.
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* Various bits and pieces copyrights include:
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* Linus Torvalds (test_bit).
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*
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* Copyright (C) 2011 Andes Technology Corporation
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* Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
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*
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* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
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*
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* Please note that the code in this file should never be included
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* from user space. Many of these are not implemented in assembler
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* since they would be too costly. Also, they require priviledged
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* instructions (which are not available from user mode) to ensure
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* that they are atomic.
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*/
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#ifndef __ASM_NDS_BITOPS_H
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#define __ASM_NDS_BITOPS_H
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#ifdef __KERNEL__
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#include <asm/system.h>
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#include <asm-generic/bitops/fls.h>
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#include <asm-generic/bitops/__fls.h>
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#include <asm-generic/bitops/fls64.h>
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#include <asm-generic/bitops/__ffs.h>
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#define smp_mb__before_clear_bit() do { } while (0)
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#define smp_mb__after_clear_bit() do { } while (0)
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/*
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* Function prototypes to keep gcc -Wall happy.
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*/
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extern void set_bit(int nr, void *addr);
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static inline void __set_bit(int nr, void *addr)
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{
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int *a = (int *)addr;
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int mask;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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*a |= mask;
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}
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#define PLATFORM__SET_BIT
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extern void clear_bit(int nr, void *addr);
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static inline void __clear_bit(int nr, void *addr)
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{
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int *a = (int *)addr;
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int mask;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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*a &= ~mask;
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local_irq_restore(flags);
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}
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#define PLATFORM__CLEAR_BIT
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extern void change_bit(int nr, void *addr);
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static inline void __change_bit(int nr, void *addr)
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{
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int mask;
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unsigned long *ADDR = (unsigned long *)addr;
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ADDR += nr >> 5;
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mask = 1 << (nr & 31);
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*ADDR ^= mask;
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}
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extern int test_and_set_bit(int nr, void *addr);
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static inline int __test_and_set_bit(int nr, void *addr)
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{
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int mask, retval;
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unsigned int *a = (unsigned int *)addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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retval = (mask & *a) != 0;
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*a |= mask;
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return retval;
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}
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extern int test_and_clear_bit(int nr, void *addr);
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static inline int __test_and_clear_bit(int nr, void *addr)
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{
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int mask, retval;
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unsigned int *a = (unsigned int *)addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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retval = (mask & *a) != 0;
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*a &= ~mask;
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return retval;
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}
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extern int test_and_change_bit(int nr, void *addr);
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static inline int __test_and_change_bit(int nr, void *addr)
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{
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int mask, retval;
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unsigned int *a = (unsigned int *)addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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retval = (mask & *a) != 0;
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*a ^= mask;
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return retval;
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}
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extern int find_first_zero_bit(void *addr, unsigned size);
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extern int find_next_zero_bit(void *addr, int size, int offset);
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/*
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* This routine doesn't need to be atomic.
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*/
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static inline int test_bit(int nr, const void *addr)
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{
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return ((unsigned char *) addr)[nr >> 3] & (1U << (nr & 7));
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}
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/*
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* ffz = Find First Zero in word. Undefined if no zero exists,
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* so code should check against ~0UL first..
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*/
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static inline unsigned long ffz(unsigned long word)
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{
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int k;
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word = ~word;
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k = 31;
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if (word & 0x0000ffff) {
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k -= 16; word <<= 16;
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}
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if (word & 0x00ff0000) {
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k -= 8; word <<= 8;
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}
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if (word & 0x0f000000) {
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k -= 4; word <<= 4;
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}
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if (word & 0x30000000) {
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k -= 2; word <<= 2;
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}
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if (word & 0x40000000)
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k -= 1;
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return k;
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}
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/*
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* ffs: find first bit set. This is defined the same way as
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* the libc and compiler builtin ffs routines, therefore
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* differs in spirit from the above ffz (man ffs).
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*/
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/*
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* redefined in include/linux/bitops.h
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* #define ffs(x) generic_ffs(x)
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*/
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/*
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* hweightN: returns the hamming weight (i.e. the number
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* of bits set) of a N-bit word
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*/
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#define hweight32(x) generic_hweight32(x)
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#define hweight16(x) generic_hweight16(x)
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#define hweight8(x) generic_hweight8(x)
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#define ext2_set_bit test_and_set_bit
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#define ext2_clear_bit test_and_clear_bit
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#define ext2_test_bit test_bit
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#define ext2_find_first_zero_bit find_first_zero_bit
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#define ext2_find_next_zero_bit find_next_zero_bit
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/* Bitmap functions for the minix filesystem. */
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#define minix_test_and_set_bit(nr, addr) test_and_set_bit(nr, addr)
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#define minix_set_bit(nr, addr) set_bit(nr, addr)
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#define minix_test_and_clear_bit(nr, addr) test_and_clear_bit(nr, addr)
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#define minix_test_bit(nr, addr) test_bit(nr, addr)
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#define minix_find_first_zero_bit(addr, size) find_first_zero_bit(addr, size)
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#endif /* __KERNEL__ */
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#endif /* __ASM_NDS_BITOPS_H */
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