1 files changed, 460 insertions, 0 deletions

diff --git a/include/asm-ppc/bitops.h b/include/asm-ppc/bitops.h
new file mode 100644
index 000000000000..e30f536fd830
--- /dev/null
+++ b/include/asm-ppc/bitops.h
@@ -0,0 +1,460 @@
+/*
+ * bitops.h: Bit string operations on the ppc
+ */
+
+#ifdef __KERNEL__
+#ifndef _PPC_BITOPS_H
+#define _PPC_BITOPS_H
+
+#include <linux/config.h>
+#include <linux/compiler.h>
+#include <asm/byteorder.h>
+#include <asm/atomic.h>
+
+/*
+ * The test_and_*_bit operations are taken to imply a memory barrier
+ * on SMP systems.
+ */
+#ifdef CONFIG_SMP
+#define SMP_WMB         "eieio\n"
+#define SMP_MB          "\nsync"
+#else
+#define SMP_WMB
+#define SMP_MB
+#endif /* CONFIG_SMP */
+
+static __inline__ void set_bit(int nr, volatile unsigned long * addr)
+{
+        unsigned long old;
+        unsigned long mask = 1 << (nr & 0x1f);
+        unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
+        
+        __asm__ __volatile__("\n\
+1:      lwarx   %0,0,%3 \n\
+        or      %0,%0,%2 \n"
+        PPC405_ERR77(0,%3)
+"       stwcx.  %0,0,%3 \n\
+        bne-    1b"
+        : "=&r" (old), "=m" (*p)
+        : "r" (mask), "r" (p), "m" (*p)
+        : "cc" );
+}
+
+/*
+ * non-atomic version
+ */
+static __inline__ void __set_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long mask = 1 << (nr & 0x1f);
+        unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
+
+        *p |= mask;
+}
+
+/*
+ * clear_bit doesn't imply a memory barrier
+ */
+#define smp_mb__before_clear_bit()      smp_mb()
+#define smp_mb__after_clear_bit()       smp_mb()
+
+static __inline__ void clear_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long old;
+        unsigned long mask = 1 << (nr & 0x1f);
+        unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
+
+        __asm__ __volatile__("\n\
+1:      lwarx   %0,0,%3 \n\
+        andc    %0,%0,%2 \n"
+        PPC405_ERR77(0,%3)
+"       stwcx.  %0,0,%3 \n\
+        bne-    1b"
+        : "=&r" (old), "=m" (*p)
+        : "r" (mask), "r" (p), "m" (*p)
+        : "cc");
+}
+
+/*
+ * non-atomic version
+ */
+static __inline__ void __clear_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long mask = 1 << (nr & 0x1f);
+        unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
+
+        *p &= ~mask;
+}
+
+static __inline__ void change_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long old;
+        unsigned long mask = 1 << (nr & 0x1f);
+        unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
+
+        __asm__ __volatile__("\n\
+1:      lwarx   %0,0,%3 \n\
+        xor     %0,%0,%2 \n"
+        PPC405_ERR77(0,%3)
+"       stwcx.  %0,0,%3 \n\
+        bne-    1b"
+        : "=&r" (old), "=m" (*p)
+        : "r" (mask), "r" (p), "m" (*p)
+        : "cc");
+}
+
+/*
+ * non-atomic version
+ */
+static __inline__ void __change_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long mask = 1 << (nr & 0x1f);
+        unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
+
+        *p ^= mask;
+}
+
+/*
+ * test_and_*_bit do imply a memory barrier (?)
+ */
+static __inline__ int test_and_set_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned int old, t;
+        unsigned int mask = 1 << (nr & 0x1f);
+        volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
+
+        __asm__ __volatile__(SMP_WMB "\n\
+1:      lwarx   %0,0,%4 \n\
+        or      %1,%0,%3 \n"
+        PPC405_ERR77(0,%4)
+"       stwcx.  %1,0,%4 \n\
+        bne     1b"
+        SMP_MB
+        : "=&r" (old), "=&r" (t), "=m" (*p)
+        : "r" (mask), "r" (p), "m" (*p)
+        : "cc", "memory");
+
+        return (old & mask) != 0;
+}
+
+/*
+ * non-atomic version
+ */
+static __inline__ int __test_and_set_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long mask = 1 << (nr & 0x1f);
+        unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
+        unsigned long old = *p;
+
+        *p = old | mask;
+        return (old & mask) != 0;
+}
+
+static __inline__ int test_and_clear_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned int old, t;
+        unsigned int mask = 1 << (nr & 0x1f);
+        volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
+
+        __asm__ __volatile__(SMP_WMB "\n\
+1:      lwarx   %0,0,%4 \n\
+        andc    %1,%0,%3 \n"
+        PPC405_ERR77(0,%4)
+"       stwcx.  %1,0,%4 \n\
+        bne     1b"
+        SMP_MB
+        : "=&r" (old), "=&r" (t), "=m" (*p)
+        : "r" (mask), "r" (p), "m" (*p)
+        : "cc", "memory");
+
+        return (old & mask) != 0;
+}
+
+/*
+ * non-atomic version
+ */
+static __inline__ int __test_and_clear_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long mask = 1 << (nr & 0x1f);
+        unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
+        unsigned long old = *p;
+
+        *p = old & ~mask;
+        return (old & mask) != 0;
+}
+
+static __inline__ int test_and_change_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned int old, t;
+        unsigned int mask = 1 << (nr & 0x1f);
+        volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
+
+        __asm__ __volatile__(SMP_WMB "\n\
+1:      lwarx   %0,0,%4 \n\
+        xor     %1,%0,%3 \n"
+        PPC405_ERR77(0,%4)
+"       stwcx.  %1,0,%4 \n\
+        bne     1b"
+        SMP_MB
+        : "=&r" (old), "=&r" (t), "=m" (*p)
+        : "r" (mask), "r" (p), "m" (*p)
+        : "cc", "memory");
+
+        return (old & mask) != 0;
+}
+
+/*
+ * non-atomic version
+ */
+static __inline__ int __test_and_change_bit(int nr, volatile unsigned long *addr)
+{
+        unsigned long mask = 1 << (nr & 0x1f);
+        unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
+        unsigned long old = *p;
+
+        *p = old ^ mask;
+        return (old & mask) != 0;
+}
+
+static __inline__ int test_bit(int nr, __const__ volatile unsigned long *addr)
+{
+        return ((addr[nr >> 5] >> (nr & 0x1f)) & 1) != 0;
+}
+
+/* Return the bit position of the most significant 1 bit in a word */
+static __inline__ int __ilog2(unsigned long x)
+{
+        int lz;
+
+        asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
+        return 31 - lz;
+}
+
+static __inline__ int ffz(unsigned long x)
+{
+        if ((x = ~x) == 0)
+                return 32;
+        return __ilog2(x & -x);
+}
+
+static inline int __ffs(unsigned long x)
+{
+        return __ilog2(x & -x);
+}
+
+/*
+ * 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)
+{
+        return __ilog2(x & -x) + 1;
+}
+
+/*
+ * fls: find last (most-significant) bit set.
+ * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
+ */
+static __inline__ int fls(unsigned int x)
+{
+        int lz;
+
+        asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
+        return 32 - lz;
+}
+
+/*
+ * 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)
+
+/*
+ * 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;
+}
+
+/**
+ * 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)
+
+/*
+ * This implementation of find_{first,next}_zero_bit was stolen from
+ * Linus' asm-alpha/bitops.h.
+ */
+#define find_first_zero_bit(addr, size) \
+        find_next_zero_bit((addr), (size), 0)
+
+static __inline__ unsigned long find_next_zero_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 >> (32-offset);
+                if (size < 32)
+                        goto found_first;
+                if (tmp != ~0U)
+                        goto found_middle;
+                size -= 32;
+                result += 32;
+        }
+        while (size >= 32) {
+                if ((tmp = *p++) != ~0U)
+                        goto found_middle;
+                result += 32;
+                size -= 32;
+        }
+        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);
+}
+
+
+#define ext2_set_bit(nr, addr)  __test_and_set_bit((nr) ^ 0x18, (unsigned long *)(addr))
+#define ext2_set_bit_atomic(lock, nr, addr)  test_and_set_bit((nr) ^ 0x18, (unsigned long *)(addr))
+#define ext2_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 0x18, (unsigned long *)(addr))
+#define ext2_clear_bit_atomic(lock, nr, addr) test_and_clear_bit((nr) ^ 0x18, (unsigned long *)(addr))
+
+static __inline__ int ext2_test_bit(int nr, __const__ void * addr)
+{
+        __const__ unsigned char *ADDR = (__const__ unsigned char *) addr;
+
+        return (ADDR[nr >> 3] >> (nr & 7)) & 1;
+}
+
+/*
+ * This implementation of ext2_find_{first,next}_zero_bit was stolen from
+ * Linus' asm-alpha/bitops.h and modified for a big-endian machine.
+ */
+
+#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(const void *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 = cpu_to_le32p(p++);
+                tmp |= ~0UL >> (32-offset);
+                if (size < 32)
+                        goto found_first;
+                if (tmp != ~0U)
+                        goto found_middle;
+                size -= 32;
+                result += 32;
+        }
+        while (size >= 32) {
+                if ((tmp = cpu_to_le32p(p++)) != ~0U)
+                        goto found_middle;
+                result += 32;
+                size -= 32;
+        }
+        if (!size)
+                return result;
+        tmp = cpu_to_le32p(p);
+found_first:
+        tmp |= ~0U << size;
+        if (tmp == ~0UL)        /* Are any bits zero? */
+                return result + size; /* Nope. */
+found_middle:
+        return result + ffz(tmp);
+}
+
+/* Bitmap functions for the minix filesystem.  */
+#define minix_test_and_set_bit(nr,addr) ext2_set_bit(nr,addr)
+#define minix_set_bit(nr,addr) ((void)ext2_set_bit(nr,addr))
+#define minix_test_and_clear_bit(nr,addr) ext2_clear_bit(nr,addr)
+#define minix_test_bit(nr,addr) ext2_test_bit(nr,addr)
+#define minix_find_first_zero_bit(addr,size) ext2_find_first_zero_bit(addr,size)
+
+#endif /* _PPC_BITOPS_H */
+#endif /* __KERNEL__ */