1 files changed, 507 insertions, 0 deletions

diff --git a/include/asm-alpha/bitops.h b/include/asm-alpha/bitops.h
new file mode 100644
index 000000000000..578ed3f1a607
--- /dev/null
+++ b/include/asm-alpha/bitops.h
@@ -0,0 +1,507 @@
+#ifndef _ALPHA_BITOPS_H
+#define _ALPHA_BITOPS_H
+
+#include <linux/config.h>
+#include <asm/compiler.h>
+
+/*
+ * Copyright 1994, Linus Torvalds.
+ */
+
+/*
+ * These have to be done with inline assembly: that way the bit-setting
+ * is guaranteed to be atomic. All bit operations return 0 if the bit
+ * was cleared before the operation and != 0 if it was not.
+ *
+ * To get proper branch prediction for the main line, we must branch
+ * forward to code at the end of this object's .text section, then
+ * branch back to restart the operation.
+ *
+ * bit 0 is the LSB of addr; bit 64 is the LSB of (addr+1).
+ */
+
+static inline void
+set_bit(unsigned long nr, volatile void * addr)
+{
+        unsigned long temp;
+        int *m = ((int *) addr) + (nr >> 5);
+
+        __asm__ __volatile__(
+        "1:     ldl_l %0,%3\n"
+        "       bis %0,%2,%0\n"
+        "       stl_c %0,%1\n"
+        "       beq %0,2f\n"
+        ".subsection 2\n"
+        "2:     br 1b\n"
+        ".previous"
+        :"=&r" (temp), "=m" (*m)
+        :"Ir" (1UL << (nr & 31)), "m" (*m));
+}
+
+/*
+ * WARNING: non atomic version.
+ */
+static inline void
+__set_bit(unsigned long nr, volatile void * addr)
+{
+        int *m = ((int *) addr) + (nr >> 5);
+
+        *m |= 1 << (nr & 31);
+}
+
+#define smp_mb__before_clear_bit()      smp_mb()
+#define smp_mb__after_clear_bit()       smp_mb()
+
+static inline void
+clear_bit(unsigned long nr, volatile void * addr)
+{
+        unsigned long temp;
+        int *m = ((int *) addr) + (nr >> 5);
+
+        __asm__ __volatile__(
+        "1:     ldl_l %0,%3\n"
+        "       bic %0,%2,%0\n"
+        "       stl_c %0,%1\n"
+        "       beq %0,2f\n"
+        ".subsection 2\n"
+        "2:     br 1b\n"
+        ".previous"
+        :"=&r" (temp), "=m" (*m)
+        :"Ir" (1UL << (nr & 31)), "m" (*m));
+}
+
+/*
+ * WARNING: non atomic version.
+ */
+static __inline__ void
+__clear_bit(unsigned long nr, volatile void * addr)
+{
+        int *m = ((int *) addr) + (nr >> 5);
+
+        *m &= ~(1 << (nr & 31));
+}
+
+static inline void
+change_bit(unsigned long nr, volatile void * addr)
+{
+        unsigned long temp;
+        int *m = ((int *) addr) + (nr >> 5);
+
+        __asm__ __volatile__(
+        "1:     ldl_l %0,%3\n"
+        "       xor %0,%2,%0\n"
+        "       stl_c %0,%1\n"
+        "       beq %0,2f\n"
+        ".subsection 2\n"
+        "2:     br 1b\n"
+        ".previous"
+        :"=&r" (temp), "=m" (*m)
+        :"Ir" (1UL << (nr & 31)), "m" (*m));
+}
+
+/*
+ * WARNING: non atomic version.
+ */
+static __inline__ void
+__change_bit(unsigned long nr, volatile void * addr)
+{
+        int *m = ((int *) addr) + (nr >> 5);
+
+        *m ^= 1 << (nr & 31);
+}
+
+static inline int
+test_and_set_bit(unsigned long nr, volatile void *addr)
+{
+        unsigned long oldbit;
+        unsigned long temp;
+        int *m = ((int *) addr) + (nr >> 5);
+
+        __asm__ __volatile__(
+        "1:     ldl_l %0,%4\n"
+        "       and %0,%3,%2\n"
+        "       bne %2,2f\n"
+        "       xor %0,%3,%0\n"
+        "       stl_c %0,%1\n"
+        "       beq %0,3f\n"
+        "2:\n"
+#ifdef CONFIG_SMP
+        "       mb\n"
+#endif
+        ".subsection 2\n"
+        "3:     br 1b\n"
+        ".previous"
+        :"=&r" (temp), "=m" (*m), "=&r" (oldbit)
+        :"Ir" (1UL << (nr & 31)), "m" (*m) : "memory");
+
+        return oldbit != 0;
+}
+
+/*
+ * WARNING: non atomic version.
+ */
+static inline int
+__test_and_set_bit(unsigned long nr, volatile void * addr)
+{
+        unsigned long mask = 1 << (nr & 0x1f);
+        int *m = ((int *) addr) + (nr >> 5);
+        int old = *m;
+
+        *m = old | mask;
+        return (old & mask) != 0;
+}
+
+static inline int
+test_and_clear_bit(unsigned long nr, volatile void * addr)
+{
+        unsigned long oldbit;
+        unsigned long temp;
+        int *m = ((int *) addr) + (nr >> 5);
+
+        __asm__ __volatile__(
+        "1:     ldl_l %0,%4\n"
+        "       and %0,%3,%2\n"
+        "       beq %2,2f\n"
+        "       xor %0,%3,%0\n"
+        "       stl_c %0,%1\n"
+        "       beq %0,3f\n"
+        "2:\n"
+#ifdef CONFIG_SMP
+        "       mb\n"
+#endif
+        ".subsection 2\n"
+        "3:     br 1b\n"
+        ".previous"
+        :"=&r" (temp), "=m" (*m), "=&r" (oldbit)
+        :"Ir" (1UL << (nr & 31)), "m" (*m) : "memory");
+
+        return oldbit != 0;
+}
+
+/*
+ * WARNING: non atomic version.
+ */
+static inline int
+__test_and_clear_bit(unsigned long nr, volatile void * addr)
+{
+        unsigned long mask = 1 << (nr & 0x1f);
+        int *m = ((int *) addr) + (nr >> 5);
+        int old = *m;
+
+        *m = old & ~mask;
+        return (old & mask) != 0;
+}
+
+static inline int
+test_and_change_bit(unsigned long nr, volatile void * addr)
+{
+        unsigned long oldbit;
+        unsigned long temp;
+        int *m = ((int *) addr) + (nr >> 5);
+
+        __asm__ __volatile__(
+        "1:     ldl_l %0,%4\n"
+        "       and %0,%3,%2\n"
+        "       xor %0,%3,%0\n"
+        "       stl_c %0,%1\n"
+        "       beq %0,3f\n"
+#ifdef CONFIG_SMP
+        "       mb\n"
+#endif
+        ".subsection 2\n"
+        "3:     br 1b\n"
+        ".previous"
+        :"=&r" (temp), "=m" (*m), "=&r" (oldbit)
+        :"Ir" (1UL << (nr & 31)), "m" (*m) : "memory");
+
+        return oldbit != 0;
+}
+
+/*
+ * WARNING: non atomic version.
+ */
+static __inline__ int
+__test_and_change_bit(unsigned long nr, volatile void * addr)
+{
+        unsigned long mask = 1 << (nr & 0x1f);
+        int *m = ((int *) addr) + (nr >> 5);
+        int old = *m;
+
+        *m = old ^ mask;
+        return (old & mask) != 0;
+}
+
+static inline int
+test_bit(int nr, const volatile void * addr)
+{
+        return (1UL & (((const int *) addr)[nr >> 5] >> (nr & 31))) != 0UL;
+}
+
+/*
+ * ffz = Find First Zero in word. Undefined if no zero exists,
+ * so code should check against ~0UL first..
+ *
+ * Do a binary search on the bits.  Due to the nature of large
+ * constants on the alpha, it is worthwhile to split the search.
+ */
+static inline unsigned long ffz_b(unsigned long x)
+{
+        unsigned long sum, x1, x2, x4;
+
+        x = ~x & -~x;           /* set first 0 bit, clear others */
+        x1 = x & 0xAA;
+        x2 = x & 0xCC;
+        x4 = x & 0xF0;
+        sum = x2 ? 2 : 0;
+        sum += (x4 != 0) * 4;
+        sum += (x1 != 0);
+
+        return sum;
+}
+
+static inline unsigned long ffz(unsigned long word)
+{
+#if defined(__alpha_cix__) && defined(__alpha_fix__)
+        /* Whee.  EV67 can calculate it directly.  */
+        return __kernel_cttz(~word);
+#else
+        unsigned long bits, qofs, bofs;
+
+        bits = __kernel_cmpbge(word, ~0UL);
+        qofs = ffz_b(bits);
+        bits = __kernel_extbl(word, qofs);
+        bofs = ffz_b(bits);
+
+        return qofs*8 + bofs;
+#endif
+}
+
+/*
+ * __ffs = Find First set bit in word.  Undefined if no set bit exists.
+ */
+static inline unsigned long __ffs(unsigned long word)
+{
+#if defined(__alpha_cix__) && defined(__alpha_fix__)
+        /* Whee.  EV67 can calculate it directly.  */
+        return __kernel_cttz(word);
+#else
+        unsigned long bits, qofs, bofs;
+
+        bits = __kernel_cmpbge(0, word);
+        qofs = ffz_b(bits);
+        bits = __kernel_extbl(word, qofs);
+        bofs = ffz_b(~bits);
+
+        return qofs*8 + bofs;
+#endif
+}
+
+#ifdef __KERNEL__
+
+/*
+ * 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 __ffs.
+ */
+
+static inline int ffs(int word)
+{
+        int result = __ffs(word) + 1;
+        return word ? result : 0;
+}
+
+/*
+ * fls: find last bit set.
+ */
+#if defined(__alpha_cix__) && defined(__alpha_fix__)
+static inline int fls(int word)
+{
+        return 64 - __kernel_ctlz(word & 0xffffffff);
+}
+#else
+#define fls     generic_fls
+#endif
+
+/* Compute powers of two for the given integer.  */
+static inline long floor_log2(unsigned long word)
+{
+#if defined(__alpha_cix__) && defined(__alpha_fix__)
+        return 63 - __kernel_ctlz(word);
+#else
+        long bit;
+        for (bit = -1; word ; bit++)
+                word >>= 1;
+        return bit;
+#endif
+}
+
+static inline long ceil_log2(unsigned long word)
+{
+        long bit = floor_log2(word);
+        return bit + (word > (1UL << bit));
+}
+
+/*
+ * hweightN: returns the hamming weight (i.e. the number
+ * of bits set) of a N-bit word
+ */
+
+#if defined(__alpha_cix__) && defined(__alpha_fix__)
+/* Whee.  EV67 can calculate it directly.  */
+static inline unsigned long hweight64(unsigned long w)
+{
+        return __kernel_ctpop(w);
+}
+
+#define hweight32(x)    (unsigned int) hweight64((x) & 0xfffffffful)
+#define hweight16(x)    (unsigned int) hweight64((x) & 0xfffful)
+#define hweight8(x)     (unsigned int) hweight64((x) & 0xfful)
+#else
+static inline unsigned long hweight64(unsigned long w)
+{
+        unsigned long result;
+        for (result = 0; w ; w >>= 1)
+                result += (w & 1);
+        return result;
+}
+
+#define hweight32(x) generic_hweight32(x)
+#define hweight16(x) generic_hweight16(x)
+#define hweight8(x)  generic_hweight8(x)
+#endif
+
+#endif /* __KERNEL__ */
+
+/*
+ * Find next zero bit in a bitmap reasonably efficiently..
+ */
+static inline unsigned long
+find_next_zero_bit(const void *addr, unsigned long size, unsigned long offset)
+{
+        const unsigned long *p = addr;
+        unsigned long result = offset & ~63UL;
+        unsigned long tmp;
+
+        p += offset >> 6;
+        if (offset >= size)
+                return size;
+        size -= result;
+        offset &= 63UL;
+        if (offset) {
+                tmp = *(p++);
+                tmp |= ~0UL >> (64-offset);
+                if (size < 64)
+                        goto found_first;
+                if (~tmp)
+                        goto found_middle;
+                size -= 64;
+                result += 64;
+        }
+        while (size & ~63UL) {
+                if (~(tmp = *(p++)))
+                        goto found_middle;
+                result += 64;
+                size -= 64;
+        }
+        if (!size)
+                return result;
+        tmp = *p;
+ found_first:
+        tmp |= ~0UL << size;
+        if (tmp == ~0UL)        /* Are any bits zero? */
+                return result + size; /* Nope. */
+ found_middle:
+        return result + ffz(tmp);
+}
+
+/*
+ * Find next one bit in a bitmap reasonably efficiently.
+ */
+static inline unsigned long
+find_next_bit(const void * addr, unsigned long size, unsigned long offset)
+{
+        const unsigned long *p = addr;
+        unsigned long result = offset & ~63UL;
+        unsigned long tmp;
+
+        p += offset >> 6;
+        if (offset >= size)
+                return size;
+        size -= result;
+        offset &= 63UL;
+        if (offset) {
+                tmp = *(p++);
+                tmp &= ~0UL << offset;
+                if (size < 64)
+                        goto found_first;
+                if (tmp)
+                        goto found_middle;
+                size -= 64;
+                result += 64;
+        }
+        while (size & ~63UL) {
+                if ((tmp = *(p++)))
+                        goto found_middle;
+                result += 64;
+                size -= 64;
+        }
+        if (!size)
+                return result;
+        tmp = *p;
+ found_first:
+        tmp &= ~0UL >> (64 - size);
+        if (!tmp)
+                return result + size;
+ found_middle:
+        return result + __ffs(tmp);
+}
+
+/*
+ * The optimizer actually does good code for this case.
+ */
+#define find_first_zero_bit(addr, size) \
+        find_next_zero_bit((addr), (size), 0)
+#define find_first_bit(addr, size) \
+        find_next_bit((addr), (size), 0)
+
+#ifdef __KERNEL__
+
+/*
+ * 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 set.
+ */
+static inline unsigned long
+sched_find_first_bit(unsigned long b[3])
+{
+        unsigned long b0 = b[0], b1 = b[1], b2 = b[2];
+        unsigned long ofs;
+
+        ofs = (b1 ? 64 : 128);
+        b1 = (b1 ? b1 : b2);
+        ofs = (b0 ? 0 : ofs);
+        b0 = (b0 ? b0 : b1);
+
+        return __ffs(b0) + ofs;
+}
+
+
+#define ext2_set_bit                 __test_and_set_bit
+#define ext2_set_bit_atomic(l,n,a)   test_and_set_bit(n,a)
+#define ext2_clear_bit               __test_and_clear_bit
+#define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a)
+#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
+
+/* 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__ */
+
+#endif /* _ALPHA_BITOPS_H */