* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
*/
+#include <linux/config.h>
#include <linux/compiler.h>
#include <asm/assembler.h>
#include <asm/system.h>
local_irq_restore(flags);
}
+/**
+ * __set_bit - Set a bit in memory
+ * @nr: the bit to set
+ * @addr: the address to start counting from
+ *
+ * Unlike set_bit(), this function is non-atomic and may be reordered.
+ * If it's called on the same region of memory simultaneously, the effect
+ * may be that only one operation succeeds.
+ */
+static __inline__ void __set_bit(int nr, volatile void * addr)
+{
+ __u32 mask;
+ volatile __u32 *a = addr;
+
+ a += (nr >> 5);
+ mask = (1 << (nr & 0x1F));
+ *a |= mask;
+}
+
/**
* clear_bit - Clears a bit in memory
* @nr: Bit to clear
local_irq_restore(flags);
}
+static __inline__ void __clear_bit(int nr, volatile unsigned long * addr)
+{
+ unsigned long mask;
+ volatile unsigned long *a = addr;
+
+ a += (nr >> 5);
+ mask = (1 << (nr & 0x1F));
+ *a &= ~mask;
+}
+
#define smp_mb__before_clear_bit() barrier()
#define smp_mb__after_clear_bit() barrier()
+/**
+ * __change_bit - Toggle a bit in memory
+ * @nr: the bit to set
+ * @addr: the address to start counting from
+ *
+ * Unlike change_bit(), this function is non-atomic and may be reordered.
+ * If it's called on the same region of memory simultaneously, the effect
+ * may be that only one operation succeeds.
+ */
+static __inline__ void __change_bit(int nr, volatile void * addr)
+{
+ __u32 mask;
+ volatile __u32 *a = addr;
+
+ a += (nr >> 5);
+ mask = (1 << (nr & 0x1F));
+ *a ^= mask;
+}
+
/**
* change_bit - Toggle a bit in memory
* @nr: Bit to clear
return (oldbit != 0);
}
+/**
+ * __test_and_set_bit - Set a bit and return its old value
+ * @nr: Bit to set
+ * @addr: Address to count from
+ *
+ * This operation is non-atomic and can be reordered.
+ * If two examples of this operation race, one can appear to succeed
+ * but actually fail. You must protect multiple accesses with a lock.
+ */
+static __inline__ int __test_and_set_bit(int nr, volatile void * addr)
+{
+ __u32 mask, oldbit;
+ volatile __u32 *a = addr;
+
+ a += (nr >> 5);
+ mask = (1 << (nr & 0x1F));
+ oldbit = (*a & mask);
+ *a |= mask;
+
+ return (oldbit != 0);
+}
+
/**
* test_and_clear_bit - Clear a bit and return its old value
* @nr: Bit to set
return (oldbit != 0);
}
+/**
+ * __test_and_clear_bit - Clear a bit and return its old value
+ * @nr: Bit to set
+ * @addr: Address to count from
+ *
+ * This operation is non-atomic and can be reordered.
+ * If two examples of this operation race, one can appear to succeed
+ * but actually fail. You must protect multiple accesses with a lock.
+ */
+static __inline__ int __test_and_clear_bit(int nr, volatile void * addr)
+{
+ __u32 mask, oldbit;
+ volatile __u32 *a = addr;
+
+ a += (nr >> 5);
+ mask = (1 << (nr & 0x1F));
+ oldbit = (*a & mask);
+ *a &= ~mask;
+
+ return (oldbit != 0);
+}
+
+/* WARNING: non atomic and it can be reordered! */
+static __inline__ int __test_and_change_bit(int nr, volatile void * addr)
+{
+ __u32 mask, oldbit;
+ volatile __u32 *a = addr;
+
+ a += (nr >> 5);
+ mask = (1 << (nr & 0x1F));
+ oldbit = (*a & mask);
+ *a ^= mask;
+
+ return (oldbit != 0);
+}
+
/**
* test_and_change_bit - Change a bit and return its old value
* @nr: Bit to set
return (oldbit != 0);
}
-#include <asm-generic/bitops/non-atomic.h>
-#include <asm-generic/bitops/ffz.h>
-#include <asm-generic/bitops/__ffs.h>
-#include <asm-generic/bitops/fls.h>
-#include <asm-generic/bitops/fls64.h>
+/**
+ * test_bit - Determine whether a bit is set
+ * @nr: bit number to test
+ * @addr: Address to start counting from
+ */
+static __inline__ int test_bit(int nr, const volatile void * addr)
+{
+ __u32 mask;
+ const volatile __u32 *a = addr;
+
+ a += (nr >> 5);
+ mask = (1 << (nr & 0x1F));
+
+ return ((*a & mask) != 0);
+}
+
+/**
+ * ffz - find first zero in word.
+ * @word: The word to search
+ *
+ * Undefined if no zero exists, so code should check against ~0UL first.
+ */
+static __inline__ unsigned long ffz(unsigned long word)
+{
+ int k;
+
+ word = ~word;
+ k = 0;
+ if (!(word & 0x0000ffff)) { k += 16; word >>= 16; }
+ if (!(word & 0x000000ff)) { k += 8; word >>= 8; }
+ if (!(word & 0x0000000f)) { k += 4; word >>= 4; }
+ if (!(word & 0x00000003)) { k += 2; word >>= 2; }
+ if (!(word & 0x00000001)) { k += 1; }
+
+ return k;
+}
+
+/**
+ * find_first_zero_bit - find the first zero 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 zero bit, not the number of the byte
+ * containing a bit.
+ */
+
+#define find_first_zero_bit(addr, size) \
+ find_next_zero_bit((addr), (size), 0)
+
+/**
+ * find_next_zero_bit - find the first zero bit in a memory region
+ * @addr: The address to base the search on
+ * @offset: The bitnumber to start searching at
+ * @size: The maximum size to search
+ */
+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);
+}
+
+/**
+ * __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__ unsigned long __ffs(unsigned long word)
+{
+ int k = 0;
+
+ if (!(word & 0x0000ffff)) { k += 16; word >>= 16; }
+ if (!(word & 0x000000ff)) { k += 8; word >>= 8; }
+ if (!(word & 0x0000000f)) { k += 4; word >>= 4; }
+ if (!(word & 0x00000003)) { k += 2; word >>= 2; }
+ if (!(word & 0x00000001)) { k += 1;}
+
+ return k;
+}
+
+/*
+ * fls: find last bit set.
+ */
+#define fls(x) generic_fls(x)
+#define fls64(x) generic_fls64(x)
#ifdef __KERNEL__
-#include <asm-generic/bitops/sched.h>
-#include <asm-generic/bitops/find.h>
-#include <asm-generic/bitops/ffs.h>
-#include <asm-generic/bitops/hweight.h>
+/*
+ * Every architecture must define this function. It's the fastest
+ * way of searching a 140-bit bitmap where the first 100 bits are
+ * unlikely to be set. It's guaranteed that at least one of the 140
+ * bits is cleared.
+ */
+static inline int sched_find_first_bit(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;
+}
+
+/**
+ * find_next_bit - find the first set bit in a memory region
+ * @addr: The address to base the search on
+ * @offset: The bitnumber to start searching at
+ * @size: The maximum size to search
+ */
+static inline unsigned long find_next_bit(const unsigned long *addr,
+ unsigned long size, unsigned long offset)
+{
+ unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
+ unsigned int result = offset & ~31UL;
+ unsigned int 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)
+
+/**
+ * ffs - find first bit set
+ * @x: the word to search
+ *
+ * This is defined the same way as
+ * the libc and compiler builtin ffs routines, therefore
+ * differs in spirit from the above ffz (man ffs).
+ */
+#define ffs(x) generic_ffs(x)
+
+/**
+ * hweightN - returns the hamming weight of a N-bit word
+ * @x: the word to weigh
+ *
+ * The Hamming Weight of a number is the total number of bits set in it.
+ */
+
+#define hweight32(x) generic_hweight32(x)
+#define hweight16(x) generic_hweight16(x)
+#define hweight8(x) generic_hweight8(x)
#endif /* __KERNEL__ */
#ifdef __KERNEL__
-#include <asm-generic/bitops/ext2-non-atomic.h>
-#include <asm-generic/bitops/ext2-atomic.h>
-#include <asm-generic/bitops/minix.h>
+/*
+ * ext2_XXXX function
+ * orig: include/asm-sh/bitops.h
+ */
+
+#ifdef __LITTLE_ENDIAN__
+#define ext2_set_bit test_and_set_bit
+#define ext2_clear_bit __test_and_clear_bit
+#define ext2_test_bit test_bit
+#define ext2_find_first_zero_bit find_first_zero_bit
+#define ext2_find_next_zero_bit find_next_zero_bit
+#else
+static inline int ext2_set_bit(int nr, volatile void * addr)
+{
+ __u8 mask, oldbit;
+ volatile __u8 *a = addr;
+
+ a += (nr >> 3);
+ mask = (1 << (nr & 0x07));
+ oldbit = (*a & mask);
+ *a |= mask;
+
+ return (oldbit != 0);
+}
+
+static inline int ext2_clear_bit(int nr, volatile void * addr)
+{
+ __u8 mask, oldbit;
+ volatile __u8 *a = addr;
+
+ a += (nr >> 3);
+ mask = (1 << (nr & 0x07));
+ oldbit = (*a & mask);
+ *a &= ~mask;
+
+ return (oldbit != 0);
+}
+
+static inline int ext2_test_bit(int nr, const volatile void * addr)
+{
+ __u32 mask;
+ const volatile __u8 *a = addr;
+
+ a += (nr >> 3);
+ mask = (1 << (nr & 0x07));
+
+ return ((mask & *a) != 0);
+}
+
+#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));
+}
+#endif
+
+#define ext2_set_bit_atomic(lock, nr, addr) \
+ ({ \
+ int ret; \
+ spin_lock(lock); \
+ ret = ext2_set_bit((nr), (addr)); \
+ spin_unlock(lock); \
+ ret; \
+ })
+
+#define ext2_clear_bit_atomic(lock, nr, addr) \
+ ({ \
+ int ret; \
+ spin_lock(lock); \
+ ret = ext2_clear_bit((nr), (addr)); \
+ spin_unlock(lock); \
+ ret; \
+ })
+
+/* 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__ */
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