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author | Wolfgang Denk <wd@denx.de> | 2007-12-27 01:13:05 +0100 |
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committer | Wolfgang Denk <wd@denx.de> | 2007-12-27 01:13:05 +0100 |
commit | 6e1bbe6e3edf5f508de89114577ce7b7caa89c8a (patch) | |
tree | 8a95b158fb4103b1db399342a66ba414aa5e82c1 /include/asm-sh/bitops.h | |
parent | 58bbc77eb0a01033803264539d2c76c242cba210 (diff) | |
parent | 81b38be8631a0b809c97ab3d929f491373d7314f (diff) | |
download | u-boot-imx-6e1bbe6e3edf5f508de89114577ce7b7caa89c8a.zip u-boot-imx-6e1bbe6e3edf5f508de89114577ce7b7caa89c8a.tar.gz u-boot-imx-6e1bbe6e3edf5f508de89114577ce7b7caa89c8a.tar.bz2 |
Merge branch 'master' of /home/wd/git/u-boot/custodians
Diffstat (limited to 'include/asm-sh/bitops.h')
-rw-r--r-- | include/asm-sh/bitops.h | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/include/asm-sh/bitops.h b/include/asm-sh/bitops.h new file mode 100644 index 0000000..529d0f2 --- /dev/null +++ b/include/asm-sh/bitops.h @@ -0,0 +1,166 @@ +#ifndef __ASM_SH_BITOPS_H +#define __ASM_SH_BITOPS_H + +#ifdef __KERNEL__ +//#include <asm/system.h> +#include <asm/irqflags.h> +/* For __swab32 */ +#include <asm/byteorder.h> + +static inline void set_bit(int nr, volatile void * addr) +{ + int mask; + volatile unsigned int *a = addr; + unsigned long flags; + + a += nr >> 5; + mask = 1 << (nr & 0x1f); + local_irq_save(flags); + *a |= mask; + local_irq_restore(flags); +} + +/* + * clear_bit() doesn't provide any barrier for the compiler. + */ +#define smp_mb__before_clear_bit() barrier() +#define smp_mb__after_clear_bit() barrier() +static inline void clear_bit(int nr, volatile void * addr) +{ + int mask; + volatile unsigned int *a = addr; + unsigned long flags; + + a += nr >> 5; + mask = 1 << (nr & 0x1f); + local_irq_save(flags); + *a &= ~mask; + local_irq_restore(flags); +} + +static inline void change_bit(int nr, volatile void * addr) +{ + int mask; + volatile unsigned int *a = addr; + unsigned long flags; + + a += nr >> 5; + mask = 1 << (nr & 0x1f); + local_irq_save(flags); + *a ^= mask; + local_irq_restore(flags); +} + +static inline int test_and_set_bit(int nr, volatile void * addr) +{ + int mask, retval; + volatile unsigned int *a = addr; + unsigned long flags; + + a += nr >> 5; + mask = 1 << (nr & 0x1f); + local_irq_save(flags); + retval = (mask & *a) != 0; + *a |= mask; + local_irq_restore(flags); + + return retval; +} + +static inline int test_and_clear_bit(int nr, volatile void * addr) +{ + int mask, retval; + volatile unsigned int *a = addr; + unsigned long flags; + + a += nr >> 5; + mask = 1 << (nr & 0x1f); + local_irq_save(flags); + retval = (mask & *a) != 0; + *a &= ~mask; + local_irq_restore(flags); + + return retval; +} + +static inline int test_and_change_bit(int nr, volatile void * addr) +{ + int mask, retval; + volatile unsigned int *a = addr; + unsigned long flags; + + a += nr >> 5; + mask = 1 << (nr & 0x1f); + local_irq_save(flags); + retval = (mask & *a) != 0; + *a ^= mask; + local_irq_restore(flags); + + return retval; +} + +//#include <asm-generic/bitops/non-atomic.h> + +static inline unsigned long ffz(unsigned long word) +{ + unsigned long result; + + __asm__("1:\n\t" + "shlr %1\n\t" + "bt/s 1b\n\t" + " add #1, %0" + : "=r" (result), "=r" (word) + : "0" (~0L), "1" (word) + : "t"); + return result; +} + +/** + * ffs - find first bit in word. + * @word: The word to search + * + * Undefined if no bit exists, so code should check against 0 first. + */ +static inline int ffs(int x) +{ + int r = 1; + + if (!x) + return 0; + if (!(x & 0xffff)) { + x >>= 16; + r += 16; + } + if (!(x & 0xff)) { + x >>= 8; + r += 8; + } + if (!(x & 0xf)) { + x >>= 4; + r += 4; + } + if (!(x & 3)) { + x >>= 2; + r += 2; + } + if (!(x & 1)) { + x >>= 1; + r += 1; + } + return r; +} + +#if 0 +#include <asm-generic/bitops/find.h> +#include <asm-generic/bitops/ffs.h> +#include <asm-generic/bitops/hweight.h> +#include <asm-generic/bitops/sched.h> +#include <asm-generic/bitops/ext2-non-atomic.h> +#include <asm-generic/bitops/ext2-atomic.h> +#include <asm-generic/bitops/minix.h> +#include <asm-generic/bitops/fls.h> +#include <asm-generic/bitops/fls64.h> +#endif +#endif /* __KERNEL__ */ + +#endif /* __ASM_SH_BITOPS_H */ |