1 files changed, 476 insertions, 0 deletions

diff --git a/include/asm-sh/bitops.h b/include/asm-sh/bitops.h
new file mode 100644
index 000000000000..5163d1ff2f1b
--- /dev/null
+++ b/include/asm-sh/bitops.h
@@ -0,0 +1,476 @@
+#ifndef __ASM_SH_BITOPS_H
+#define __ASM_SH_BITOPS_H
+
+#ifdef __KERNEL__
+#include <asm/system.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);
+}
+
+static __inline__ void __set_bit(int nr, volatile void * addr)
+{
+        int     mask;
+        volatile unsigned int *a = addr;
+
+        a += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        *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()
+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 __clear_bit(int nr, volatile void * addr)
+{
+        int     mask;
+        volatile unsigned int *a = addr;
+
+        a += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        *a &= ~mask;
+}
+
+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__ void __change_bit(int nr, volatile void * addr)
+{
+        int     mask;
+        volatile unsigned int *a = addr;
+
+        a += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        *a ^= mask;
+}
+
+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_set_bit(int nr, volatile void * addr)
+{
+        int     mask, retval;
+        volatile unsigned int *a = addr;
+
+        a += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        retval = (mask & *a) != 0;
+        *a |= mask;
+
+        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_clear_bit(int nr, volatile void * addr)
+{
+        int     mask, retval;
+        volatile unsigned int *a = addr;
+
+        a += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        retval = (mask & *a) != 0;
+        *a &= ~mask;
+
+        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;
+}
+
+static __inline__ int __test_and_change_bit(int nr, volatile void * addr)
+{
+        int     mask, retval;
+        volatile unsigned int *a = addr;
+
+        a += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        retval = (mask & *a) != 0;
+        *a ^= mask;
+
+        return retval;
+}
+
+static __inline__ int test_bit(int nr, const volatile void *addr)
+{
+        return 1UL & (((const volatile unsigned int *) addr)[nr >> 5] >> (nr & 31));
+}
+
+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__ unsigned long __ffs(unsigned long word)
+{
+        unsigned long result;
+
+        __asm__("1:\n\t"
+                "shlr   %1\n\t"
+                "bf/s   1b\n\t"
+                " add   #1, %0"
+                : "=r" (result), "=r" (word)
+                : "0" (~0L), "1" (word)
+                : "t");
+        return result;
+}
+
+/**
+ * find_next_bit - find the next 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)
+
+static __inline__ int find_next_zero_bit(const unsigned long *addr, int size, int offset)
+{
+        const 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) {
+                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)
+
+/*
+ * ffs: find first bit set. 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 (i.e. the number
+ * of bits set) of a N-bit word
+ */
+
+#define hweight32(x) generic_hweight32(x)
+#define hweight16(x) generic_hweight16(x)
+#define hweight8(x) generic_hweight8(x)
+
+/*
+ * 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(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;
+}
+
+#ifdef __LITTLE_ENDIAN__
+#define ext2_set_bit(nr, addr) test_and_set_bit((nr), (addr))
+#define ext2_clear_bit(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((unsigned long *)(addr), (size), (offset))
+#else
+static __inline__ int ext2_set_bit(int nr, volatile void * addr)
+{
+        int             mask, retval;
+        unsigned long   flags;
+        volatile unsigned char  *ADDR = (unsigned char *) addr;
+
+        ADDR += nr >> 3;
+        mask = 1 << (nr & 0x07);
+        local_irq_save(flags);
+        retval = (mask & *ADDR) != 0;
+        *ADDR |= mask;
+        local_irq_restore(flags);
+        return retval;
+}
+
+static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
+{
+        int             mask, retval;
+        unsigned long   flags;
+        volatile unsigned char  *ADDR = (unsigned char *) addr;
+
+        ADDR += nr >> 3;
+        mask = 1 << (nr & 0x07);
+        local_irq_save(flags);
+        retval = (mask & *ADDR) != 0;
+        *ADDR &= ~mask;
+        local_irq_restore(flags);
+        return retval;
+}
+
+static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
+{
+        int                     mask;
+        const volatile unsigned char    *ADDR = (const unsigned char *) addr;
+
+        ADDR += nr >> 3;
+        mask = 1 << (nr & 0x07);
+        return ((mask & *ADDR) != 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)
+
+/*
+ * fls: find last bit set.
+ */
+
+#define fls(x) generic_fls(x)
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASM_SH_BITOPS_H */