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f86411b18d
The generic bitops headers are required when calling logarithmic functions, such as ilog2(). Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Heiko Schocher <hs@denx.de>
159 lines
2.7 KiB
C
159 lines
2.7 KiB
C
#ifndef __ASM_SH_BITOPS_H
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#define __ASM_SH_BITOPS_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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#ifdef __KERNEL__
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#include <asm/irqflags.h>
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/* For __swab32 */
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#include <asm/byteorder.h>
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static inline void set_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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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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/*
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* clear_bit() doesn't provide any barrier for the compiler.
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*/
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#define smp_mb__before_clear_bit() barrier()
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#define smp_mb__after_clear_bit() barrier()
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static inline void clear_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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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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static inline void change_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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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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static inline int test_and_set_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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volatile unsigned int *a = addr;
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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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retval = (mask & *a) != 0;
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*a |= mask;
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local_irq_restore(flags);
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return retval;
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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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int mask, retval;
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volatile unsigned int *a = addr;
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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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retval = (mask & *a) != 0;
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*a &= ~mask;
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local_irq_restore(flags);
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return retval;
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}
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static inline int test_and_change_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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volatile unsigned int *a = addr;
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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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retval = (mask & *a) != 0;
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*a ^= mask;
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local_irq_restore(flags);
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return retval;
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}
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static inline unsigned long ffz(unsigned long word)
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{
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unsigned long result;
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__asm__("1:\n\t"
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"shlr %1\n\t"
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"bt/s 1b\n\t"
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" add #1, %0"
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: "=r" (result), "=r" (word)
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: "0" (~0L), "1" (word)
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: "t");
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return result;
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}
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/**
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* ffs - find first bit in word.
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* @word: The word to search
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*
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* Undefined if no bit exists, so code should check against 0 first.
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*/
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static inline int ffs (int x)
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{
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int r = 1;
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if (!x)
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return 0;
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if (!(x & 0xffff)) {
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x >>= 16;
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r += 16;
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}
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if (!(x & 0xff)) {
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x >>= 8;
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r += 8;
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}
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if (!(x & 0xf)) {
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x >>= 4;
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r += 4;
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}
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if (!(x & 3)) {
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x >>= 2;
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r += 2;
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}
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if (!(x & 1)) {
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x >>= 1;
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r += 1;
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}
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return r;
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}
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#define PLATFORM_FFS
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_BITOPS_H */
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