X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Fasm-xtensa%2Fbitops.h;h=0a2065f1a372dc8619bfa3cbc6924b7b0c8fb2b2;hb=987b0145d94eecf292d8b301228356f44611ab7c;hp=d815649617aadb0701dee98672dd53661d9bb7d2;hpb=f7ed79d23a47594e7834d66a8f14449796d4f3e6;p=linux-2.6.git

diff --git a/include/asm-xtensa/bitops.h b/include/asm-xtensa/bitops.h
index d81564961..0a2065f1a 100644
--- a/include/asm-xtensa/bitops.h
+++ b/include/asm-xtensa/bitops.h
@@ -23,11 +23,156 @@
 # error SMP not supported on this architecture
 #endif
 
+static __inline__ void set_bit(int nr, volatile void * addr)
+{
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+	unsigned long flags;
+
+	local_irq_save(flags);
+	*a |= mask;
+	local_irq_restore(flags);
+}
+
+static __inline__ void __set_bit(int nr, volatile unsigned long * addr)
+{
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+
+	*a |= mask;
+}
+
+static __inline__ void clear_bit(int nr, volatile void * addr)
+{
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+	unsigned long flags;
+
+	local_irq_save(flags);
+	*a &= ~mask;
+	local_irq_restore(flags);
+}
+
+static __inline__ void __clear_bit(int nr, volatile unsigned long *addr)
+{
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+
+	*a &= ~mask;
+}
+
+/*
+ * clear_bit() doesn't provide any barrier for the compiler.
+ */
+
 #define smp_mb__before_clear_bit()	barrier()
 #define smp_mb__after_clear_bit()	barrier()
 
-#include <asm-generic/bitops/atomic.h>
-#include <asm-generic/bitops/non-atomic.h>
+static __inline__ void change_bit(int nr, volatile void * addr)
+{
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+	unsigned long flags;
+
+	local_irq_save(flags);
+	*a ^= mask;
+	local_irq_restore(flags);
+}
+
+static __inline__ void __change_bit(int nr, volatile void * addr)
+{
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+
+	*a ^= mask;
+}
+
+static __inline__ int test_and_set_bit(int nr, volatile void * addr)
+{
+  	unsigned long retval;
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+	unsigned long flags;
+
+	local_irq_save(flags);
+	retval = (mask & *a) != 0;
+	*a |= mask;
+	local_irq_restore(flags);
+
+	return retval;
+}
+
+static __inline__ int __test_and_set_bit(int nr, volatile void * addr)
+{
+  	unsigned long retval;
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+
+	retval = (mask & *a) != 0;
+	*a |= mask;
+
+	return retval;
+}
+
+static __inline__ int test_and_clear_bit(int nr, volatile void * addr)
+{
+  	unsigned long retval;
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+	unsigned long flags;
+
+	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)
+{
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+  	unsigned long old = *a;
+
+	*a = old & ~mask;
+	return (old & mask) != 0;
+}
+
+static __inline__ int test_and_change_bit(int nr, volatile void * addr)
+{
+  	unsigned long retval;
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	retval = (mask & *a) != 0;
+	*a ^= mask;
+	local_irq_restore(flags);
+
+	return retval;
+}
+
+/*
+ * non-atomic version; can be reordered
+ */
+
+static __inline__ int __test_and_change_bit(int nr, volatile void *addr)
+{
+	unsigned long mask = 1 << (nr & 0x1f);
+	unsigned long *a = ((unsigned long *)addr) + (nr >> 5);
+	unsigned long old = *a;
+
+	*a = old ^ mask;
+	return (old & mask) != 0;
+}
+
+static __inline__ int test_bit(int nr, const volatile void *addr)
+{
+	return 1UL & (((const volatile unsigned int *)addr)[nr>>5] >> (nr&31));
+}
 
 #if XCHAL_HAVE_NSA
 
@@ -100,23 +245,202 @@ static __inline__ int fls (unsigned int x)
 {
 	return __cntlz(x);
 }
-#include <asm-generic/bitops/fls64.h>
-#include <asm-generic/bitops/find.h>
-#include <asm-generic/bitops/ext2-non-atomic.h>
+#define fls64(x)   generic_fls64(x)
+
+static __inline__ int
+find_next_bit(const unsigned long *addr, int size, int offset)
+{
+	const unsigned long *p = addr + (offset >> 5);
+	unsigned long result = offset & ~31UL;
+	unsigned long tmp;
+
+	if (offset >= size)
+		return size;
+	size -= result;
+	offset &= 31UL;
+	if (offset) {
+		tmp = *p++;
+		tmp &= ~0UL << offset;
+		if (size < 32)
+			goto found_first;
+		if (tmp)
+			goto found_middle;
+		size -= 32;
+		result += 32;
+	}
+	while (size >= 32) {
+		if ((tmp = *p++) != 0)
+			goto found_middle;
+		result += 32;
+		size -= 32;
+	}
+	if (!size)
+		return result;
+	tmp = *p;
+
+found_first:
+	tmp &= ~0UL >> (32 - size);
+	if (tmp == 0UL)	/* Are any bits set? */
+		return result + size;	/* Nope. */
+found_middle:
+	return result + __ffs(tmp);
+}
+
+/**
+ * find_first_bit - find the first set bit in a memory region
+ * @addr: The address to start the search at
+ * @size: The maximum size to search
+ *
+ * Returns the bit-number of the first set bit, not the number of the byte
+ * containing a bit.
+ */
+
+#define find_first_bit(addr, size) \
+        find_next_bit((addr), (size), 0)
+
+static __inline__ int
+find_next_zero_bit(const unsigned long *addr, int size, int offset)
+{
+	const unsigned long *p = addr + (offset >> 5);
+	unsigned long result = offset & ~31UL;
+	unsigned long tmp;
+
+	if (offset >= size)
+		return size;
+	size -= result;
+	offset &= 31UL;
+	if (offset) {
+		tmp = *p++;
+		tmp |= ~0UL >> (32-offset);
+		if (size < 32)
+			goto found_first;
+		if (~tmp)
+			goto found_middle;
+		size -= 32;
+		result += 32;
+	}
+	while (size & ~31UL) {
+		if (~(tmp = *p++))
+			goto found_middle;
+		result += 32;
+		size -= 32;
+	}
+	if (!size)
+		return result;
+	tmp = *p;
+
+found_first:
+	tmp |= ~0UL << size;
+found_middle:
+	return result + ffz(tmp);
+}
+
+#define find_first_zero_bit(addr, size) \
+        find_next_zero_bit((addr), (size), 0)
 
 #ifdef __XTENSA_EL__
+# define ext2_set_bit(nr,addr) __test_and_set_bit((nr), (addr))
 # define ext2_set_bit_atomic(lock,nr,addr) test_and_set_bit((nr),(addr))
+# define ext2_clear_bit(nr,addr) __test_and_clear_bit((nr), (addr))
 # define ext2_clear_bit_atomic(lock,nr,addr) test_and_clear_bit((nr),(addr))
+# define ext2_test_bit(nr,addr) test_bit((nr), (addr))
+# define ext2_find_first_zero_bit(addr, size) find_first_zero_bit((addr),(size))
+# define ext2_find_next_zero_bit(addr, size, offset) \
+                find_next_zero_bit((addr), (size), (offset))
 #elif defined(__XTENSA_EB__)
+# define ext2_set_bit(nr,addr) __test_and_set_bit((nr) ^ 0x18, (addr))
 # define ext2_set_bit_atomic(lock,nr,addr) test_and_set_bit((nr) ^ 0x18, (addr))
+# define ext2_clear_bit(nr,addr) __test_and_clear_bit((nr) ^ 18, (addr))
 # define ext2_clear_bit_atomic(lock,nr,addr) test_and_clear_bit((nr)^0x18,(addr))
+# define ext2_test_bit(nr,addr) test_bit((nr) ^ 0x18, (addr))
+# define ext2_find_first_zero_bit(addr, size) \
+        ext2_find_next_zero_bit((addr), (size), 0)
+
+static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
+{
+	unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
+	unsigned long result = offset & ~31UL;
+	unsigned long tmp;
+
+	if (offset >= size)
+		return size;
+	size -= result;
+	offset &= 31UL;
+	if(offset) {
+		/* We hold the little endian value in tmp, but then the
+		 * shift is illegal. So we could keep a big endian value
+		 * in tmp, like this:
+		 *
+		 * tmp = __swab32(*(p++));
+		 * tmp |= ~0UL >> (32-offset);
+		 *
+		 * but this would decrease preformance, so we change the
+		 * shift:
+		 */
+		tmp = *(p++);
+		tmp |= __swab32(~0UL >> (32-offset));
+		if(size < 32)
+			goto found_first;
+		if(~tmp)
+			goto found_middle;
+		size -= 32;
+		result += 32;
+	}
+	while(size & ~31UL) {
+		if(~(tmp = *(p++)))
+			goto found_middle;
+		result += 32;
+		size -= 32;
+	}
+	if(!size)
+		return result;
+	tmp = *p;
+
+found_first:
+	/* tmp is little endian, so we would have to swab the shift,
+	 * see above. But then we have to swab tmp below for ffz, so
+	 * we might as well do this here.
+	 */
+	return result + ffz(__swab32(tmp) | (~0UL << size));
+found_middle:
+	return result + ffz(__swab32(tmp));
+}
+
 #else
 # error processor byte order undefined!
 #endif
 
-#include <asm-generic/bitops/hweight.h>
-#include <asm-generic/bitops/sched.h>
-#include <asm-generic/bitops/minix.h>
+
+#define hweight32(x)	generic_hweight32(x)
+#define hweight16(x)	generic_hweight16(x)
+#define hweight8(x)	generic_hweight8(x)
+
+/*
+ * Find the first bit set in a 140-bit bitmap.
+ * The first 100 bits are unlikely to be set.
+ */
+
+static inline int sched_find_first_bit(const unsigned long *b)
+{
+	if (unlikely(b[0]))
+		return __ffs(b[0]);
+	if (unlikely(b[1]))
+		return __ffs(b[1]) + 32;
+	if (unlikely(b[2]))
+		return __ffs(b[2]) + 64;
+	if (b[3])
+		return __ffs(b[3]) + 96;
+	return __ffs(b[4]) + 128;
+}
+
+
+/* Bitmap functions for the minix filesystem.  */
+
+#define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
+#define minix_set_bit(nr,addr) set_bit(nr,addr)
+#define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
+#define minix_test_bit(nr,addr) test_bit(nr,addr)
+#define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
 
 #endif	/* __KERNEL__ */