1 files changed, 436 insertions, 0 deletions

diff --git a/include/asm-m68k/bitops.h b/include/asm-m68k/bitops.h
new file mode 100644
index 000000000000..b1bcf7c66516
--- /dev/null
+++ b/include/asm-m68k/bitops.h
@@ -0,0 +1,436 @@
+#ifndef _M68K_BITOPS_H
+#define _M68K_BITOPS_H
+/*
+ * Copyright 1992, Linus Torvalds.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/compiler.h>
+
+/*
+ * Require 68020 or better.
+ *
+ * They use the standard big-endian m680x0 bit ordering.
+ */
+
+#define test_and_set_bit(nr,vaddr) \
+  (__builtin_constant_p(nr) ? \
+   __constant_test_and_set_bit(nr, vaddr) : \
+   __generic_test_and_set_bit(nr, vaddr))
+
+#define __test_and_set_bit(nr,vaddr) test_and_set_bit(nr,vaddr)
+
+static inline int __constant_test_and_set_bit(int nr, unsigned long *vaddr)
+{
+        char *p = (char *)vaddr + (nr ^ 31) / 8;
+        char retval;
+
+        __asm__ __volatile__ ("bset %2,%1; sne %0"
+                        : "=d" (retval), "+m" (*p)
+                        : "di" (nr & 7));
+
+        return retval;
+}
+
+static inline int __generic_test_and_set_bit(int nr, unsigned long *vaddr)
+{
+        char retval;
+
+        __asm__ __volatile__ ("bfset %2{%1:#1}; sne %0"
+                        : "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
+
+        return retval;
+}
+
+#define set_bit(nr,vaddr) \
+  (__builtin_constant_p(nr) ? \
+   __constant_set_bit(nr, vaddr) : \
+   __generic_set_bit(nr, vaddr))
+
+#define __set_bit(nr,vaddr) set_bit(nr,vaddr)
+
+static inline void __constant_set_bit(int nr, volatile unsigned long *vaddr)
+{
+        char *p = (char *)vaddr + (nr ^ 31) / 8;
+        __asm__ __volatile__ ("bset %1,%0"
+                        : "+m" (*p) : "di" (nr & 7));
+}
+
+static inline void __generic_set_bit(int nr, volatile unsigned long *vaddr)
+{
+        __asm__ __volatile__ ("bfset %1{%0:#1}"
+                        : : "d" (nr^31), "o" (*vaddr) : "memory");
+}
+
+#define test_and_clear_bit(nr,vaddr) \
+  (__builtin_constant_p(nr) ? \
+   __constant_test_and_clear_bit(nr, vaddr) : \
+   __generic_test_and_clear_bit(nr, vaddr))
+
+#define __test_and_clear_bit(nr,vaddr) test_and_clear_bit(nr,vaddr)
+
+static inline int __constant_test_and_clear_bit(int nr, unsigned long *vaddr)
+{
+        char *p = (char *)vaddr + (nr ^ 31) / 8;
+        char retval;
+
+        __asm__ __volatile__ ("bclr %2,%1; sne %0"
+                        : "=d" (retval), "+m" (*p)
+                        : "di" (nr & 7));
+
+        return retval;
+}
+
+static inline int __generic_test_and_clear_bit(int nr, unsigned long *vaddr)
+{
+        char retval;
+
+        __asm__ __volatile__ ("bfclr %2{%1:#1}; sne %0"
+                        : "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
+
+        return retval;
+}
+
+/*
+ * clear_bit() doesn't provide any barrier for the compiler.
+ */
+#define smp_mb__before_clear_bit()      barrier()
+#define smp_mb__after_clear_bit()       barrier()
+
+#define clear_bit(nr,vaddr) \
+  (__builtin_constant_p(nr) ? \
+   __constant_clear_bit(nr, vaddr) : \
+   __generic_clear_bit(nr, vaddr))
+#define __clear_bit(nr,vaddr) clear_bit(nr,vaddr)
+
+static inline void __constant_clear_bit(int nr, volatile unsigned long *vaddr)
+{
+        char *p = (char *)vaddr + (nr ^ 31) / 8;
+        __asm__ __volatile__ ("bclr %1,%0"
+                        : "+m" (*p) : "di" (nr & 7));
+}
+
+static inline void __generic_clear_bit(int nr, volatile unsigned long *vaddr)
+{
+        __asm__ __volatile__ ("bfclr %1{%0:#1}"
+                        : : "d" (nr^31), "o" (*vaddr) : "memory");
+}
+
+#define test_and_change_bit(nr,vaddr) \
+  (__builtin_constant_p(nr) ? \
+   __constant_test_and_change_bit(nr, vaddr) : \
+   __generic_test_and_change_bit(nr, vaddr))
+
+#define __test_and_change_bit(nr,vaddr) test_and_change_bit(nr,vaddr)
+#define __change_bit(nr,vaddr) change_bit(nr,vaddr)
+
+static inline int __constant_test_and_change_bit(int nr, unsigned long *vaddr)
+{
+        char *p = (char *)vaddr + (nr ^ 31) / 8;
+        char retval;
+
+        __asm__ __volatile__ ("bchg %2,%1; sne %0"
+                        : "=d" (retval), "+m" (*p)
+                        : "di" (nr & 7));
+
+        return retval;
+}
+
+static inline int __generic_test_and_change_bit(int nr, unsigned long *vaddr)
+{
+        char retval;
+
+        __asm__ __volatile__ ("bfchg %2{%1:#1}; sne %0"
+                        : "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
+
+        return retval;
+}
+
+#define change_bit(nr,vaddr) \
+  (__builtin_constant_p(nr) ? \
+   __constant_change_bit(nr, vaddr) : \
+   __generic_change_bit(nr, vaddr))
+
+static inline void __constant_change_bit(int nr, unsigned long *vaddr)
+{
+        char *p = (char *)vaddr + (nr ^ 31) / 8;
+        __asm__ __volatile__ ("bchg %1,%0"
+                        : "+m" (*p) : "di" (nr & 7));
+}
+
+static inline void __generic_change_bit(int nr, unsigned long *vaddr)
+{
+        __asm__ __volatile__ ("bfchg %1{%0:#1}"
+                        : : "d" (nr^31), "o" (*vaddr) : "memory");
+}
+
+static inline int test_bit(int nr, const unsigned long *vaddr)
+{
+        return (vaddr[nr >> 5] & (1UL << (nr & 31))) != 0;
+}
+
+static inline int find_first_zero_bit(const unsigned long *vaddr,
+                                      unsigned size)
+{
+        const unsigned long *p = vaddr;
+        int res = 32;
+        unsigned long num;
+
+        if (!size)
+                return 0;
+
+        size = (size + 31) >> 5;
+        while (!(num = ~*p++)) {
+                if (!--size)
+                        goto out;
+        }
+
+        __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
+                              : "=d" (res) : "d" (num & -num));
+        res ^= 31;
+out:
+        return ((long)p - (long)vaddr - 4) * 8 + res;
+}
+
+static inline int find_next_zero_bit(const unsigned long *vaddr, int size,
+                                     int offset)
+{
+        const unsigned long *p = vaddr + (offset >> 5);
+        int bit = offset & 31UL, res;
+
+        if (offset >= size)
+                return size;
+
+        if (bit) {
+                unsigned long num = ~*p++ & (~0UL << bit);
+                offset -= bit;
+
+                /* Look for zero in first longword */
+                __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
+                                      : "=d" (res) : "d" (num & -num));
+                if (res < 32)
+                        return offset + (res ^ 31);
+                offset += 32;
+        }
+        /* No zero yet, search remaining full bytes for a zero */
+        res = find_first_zero_bit(p, size - ((long)p - (long)vaddr) * 8);
+        return offset + res;
+}
+
+static inline int find_first_bit(const unsigned long *vaddr, unsigned size)
+{
+        const unsigned long *p = vaddr;
+        int res = 32;
+        unsigned long num;
+
+        if (!size)
+                return 0;
+
+        size = (size + 31) >> 5;
+        while (!(num = *p++)) {
+                if (!--size)
+                        goto out;
+        }
+
+        __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
+                              : "=d" (res) : "d" (num & -num));
+        res ^= 31;
+out:
+        return ((long)p - (long)vaddr - 4) * 8 + res;
+}
+
+static inline int find_next_bit(const unsigned long *vaddr, int size,
+                                int offset)
+{
+        const unsigned long *p = vaddr + (offset >> 5);
+        int bit = offset & 31UL, res;
+
+        if (offset >= size)
+                return size;
+
+        if (bit) {
+                unsigned long num = *p++ & (~0UL << bit);
+                offset -= bit;
+
+                /* Look for one in first longword */
+                __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
+                                      : "=d" (res) : "d" (num & -num));
+                if (res < 32)
+                        return offset + (res ^ 31);
+                offset += 32;
+        }
+        /* No one yet, search remaining full bytes for a one */
+        res = find_first_bit(p, size - ((long)p - (long)vaddr) * 8);
+        return offset + res;
+}
+
+/*
+ * ffz = Find First Zero in word. Undefined if no zero exists,
+ * so code should check against ~0UL first..
+ */
+static inline unsigned long ffz(unsigned long word)
+{
+        int res;
+
+        __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
+                              : "=d" (res) : "d" (~word & -~word));
+        return res ^ 31;
+}
+
+#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 ffz (man ffs).
+ */
+
+static inline int ffs(int x)
+{
+        int cnt;
+
+        asm ("bfffo %1{#0:#0},%0" : "=d" (cnt) : "dm" (x & -x));
+
+        return 32 - cnt;
+}
+#define __ffs(x) (ffs(x) - 1)
+
+/*
+ * fls: find last bit set.
+ */
+
+static inline int fls(int x)
+{
+        int cnt;
+
+        asm ("bfffo %1{#0,#0},%0" : "=d" (cnt) : "dm" (x));
+
+        return 32 - cnt;
+}
+
+/*
+ * 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;
+}
+
+
+/*
+ * 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)
+
+/* Bitmap functions for the minix filesystem */
+
+static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
+{
+        const unsigned short *p = vaddr, *addr = vaddr;
+        int res;
+        unsigned short num;
+
+        if (!size)
+                return 0;
+
+        size = (size >> 4) + ((size & 15) > 0);
+        while (*p++ == 0xffff)
+        {
+                if (--size == 0)
+                        return (p - addr) << 4;
+        }
+
+        num = ~*--p;
+        __asm__ __volatile__ ("bfffo %1{#16,#16},%0"
+                              : "=d" (res) : "d" (num & -num));
+        return ((p - addr) << 4) + (res ^ 31);
+}
+
+#define minix_test_and_set_bit(nr, addr)        test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
+#define minix_set_bit(nr,addr)                  set_bit((nr) ^ 16, (unsigned long *)(addr))
+#define minix_test_and_clear_bit(nr, addr)      test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
+
+static inline int minix_test_bit(int nr, const void *vaddr)
+{
+        const unsigned short *p = vaddr;
+        return (p[nr >> 4] & (1U << (nr & 15))) != 0;
+}
+
+/* Bitmap functions for the ext2 filesystem. */
+
+#define ext2_set_bit(nr, addr)                  test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
+#define ext2_set_bit_atomic(lock, nr, addr)     test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
+#define ext2_clear_bit(nr, addr)                test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
+#define ext2_clear_bit_atomic(lock, nr, addr)   test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
+
+static inline int ext2_test_bit(int nr, const void *vaddr)
+{
+        const unsigned char *p = vaddr;
+        return (p[nr >> 3] & (1U << (nr & 7))) != 0;
+}
+
+static inline int ext2_find_first_zero_bit(const void *vaddr, unsigned size)
+{
+        const unsigned long *p = vaddr, *addr = vaddr;
+        int res;
+
+        if (!size)
+                return 0;
+
+        size = (size >> 5) + ((size & 31) > 0);
+        while (*p++ == ~0UL)
+        {
+                if (--size == 0)
+                        return (p - addr) << 5;
+        }
+
+        --p;
+        for (res = 0; res < 32; res++)
+                if (!ext2_test_bit (res, p))
+                        break;
+        return (p - addr) * 32 + res;
+}
+
+static inline int ext2_find_next_zero_bit(const void *vaddr, unsigned size,
+                                          unsigned offset)
+{
+        const unsigned long *addr = vaddr;
+        const unsigned long *p = addr + (offset >> 5);
+        int bit = offset & 31UL, res;
+
+        if (offset >= size)
+                return size;
+
+        if (bit) {
+                /* Look for zero in first longword */
+                for (res = bit; res < 32; res++)
+                        if (!ext2_test_bit (res, p))
+                                return (p - addr) * 32 + res;
+                p++;
+        }
+        /* No zero yet, search remaining full bytes for a zero */
+        res = ext2_find_first_zero_bit (p, size - 32 * (p - addr));
+        return (p - addr) * 32 + res;
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _M68K_BITOPS_H */