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-rw-r--r--include/asm-sh/bitops.h175
1 files changed, 164 insertions, 11 deletions
diff --git a/include/asm-sh/bitops.h b/include/asm-sh/bitops.h
index 44dca9f..529d0f2 100644
--- a/include/asm-sh/bitops.h
+++ b/include/asm-sh/bitops.h
@@ -1,13 +1,166 @@
-#ifndef __ASM_SH_BITOPS_H_
-#define __ASM_SH_BITOPS_H_
-
-extern void set_bit(int nr, volatile void * a);
-extern void clear_bit(int nr, volatile void * a);
-extern int test_and_clear_bit(int nr, volatile void * a);
-extern void change_bit(unsigned long nr, volatile void *addr);
-extern int test_and_set_bit(int nr, volatile void * a);
-extern int test_and_change_bit(int nr, volatile void * addr);
-extern int test_bit(int nr, volatile void * a);
-extern int ffs(int i);
+#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 */