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https://github.com/AsahiLinux/u-boot
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7d89982b7a
mkconfig links ${objtree}/include/asm/proc/ to
${srctree}/arch/${arch}/include/asm/proc-armv/. This seems to be a
remnant from the past. Ever since its introduction in 2003 it is used
only in ARM build and always links to same place, so let's simplify
the code, remove it and reference directly where needed.
Successful MAKEALL for ARM and PowerPC verified on Linux.
Signed-off-by: Vasili Galka <vvv444@gmail.com>
156 lines
3.9 KiB
C
156 lines
3.9 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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* 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_ARM_BITOPS_H
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#define __ASM_ARM_BITOPS_H
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#ifdef __KERNEL__
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#include <asm/proc-armv/system.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, volatile void * addr);
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extern void clear_bit(int nr, volatile void * addr);
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extern void change_bit(int nr, volatile void * addr);
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static inline void __change_bit(int nr, volatile void *addr)
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{
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unsigned long mask = BIT_MASK(nr);
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unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
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*p ^= mask;
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}
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static inline int __test_and_set_bit(int nr, volatile void *addr)
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{
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unsigned long mask = BIT_MASK(nr);
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unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
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unsigned long old = *p;
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*p = old | mask;
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return (old & mask) != 0;
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}
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static inline int test_and_set_bit(int nr, volatile void * addr)
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{
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unsigned long flags;
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int out;
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local_irq_save(flags);
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out = __test_and_set_bit(nr, addr);
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local_irq_restore(flags);
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return out;
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}
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static inline int __test_and_clear_bit(int nr, volatile void *addr)
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{
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unsigned long mask = BIT_MASK(nr);
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unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
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unsigned long old = *p;
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*p = old & ~mask;
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return (old & mask) != 0;
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}
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static inline int test_and_clear_bit(int nr, volatile void * addr)
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{
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unsigned long flags;
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int out;
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local_irq_save(flags);
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out = __test_and_clear_bit(nr, addr);
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local_irq_restore(flags);
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return out;
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}
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extern int test_and_change_bit(int nr, volatile void * addr);
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static inline int __test_and_change_bit(int nr, volatile void *addr)
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{
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unsigned long mask = BIT_MASK(nr);
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unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
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unsigned long old = *p;
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*p = old ^ mask;
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return (old & mask) != 0;
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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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static inline int __ilog2(unsigned int x)
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{
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return generic_fls(x) - 1;
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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) { k -= 16; word <<= 16; }
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if (word & 0x00ff0000) { k -= 8; word <<= 8; }
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if (word & 0x0f000000) { k -= 4; word <<= 4; }
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if (word & 0x30000000) { k -= 2; word <<= 2; }
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if (word & 0x40000000) { k -= 1; }
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return k;
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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 /* _ARM_BITOPS_H */
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