1 files changed, 387 insertions, 0 deletions

diff --git a/include/asm-cris/bitops.h b/include/asm-cris/bitops.h
new file mode 100644
index 000000000000..d7861115d731
--- /dev/null
+++ b/include/asm-cris/bitops.h
@@ -0,0 +1,387 @@
+/* asm/bitops.h for Linux/CRIS
+ *
+ * TODO: asm versions if speed is needed
+ *
+ * All bit operations return 0 if the bit was cleared before the
+ * operation and != 0 if it was not.
+ *
+ * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
+ */
+
+#ifndef _CRIS_BITOPS_H
+#define _CRIS_BITOPS_H
+
+/* Currently this is unsuitable for consumption outside the kernel.  */
+#ifdef __KERNEL__ 
+
+#include <asm/arch/bitops.h>
+#include <asm/system.h>
+#include <linux/compiler.h>
+
+/*
+ * Some hacks to defeat gcc over-optimizations..
+ */
+struct __dummy { unsigned long a[100]; };
+#define ADDR (*(struct __dummy *) addr)
+#define CONST_ADDR (*(const struct __dummy *) addr)
+
+/*
+ * set_bit - Atomically set a bit in memory
+ * @nr: the bit to set
+ * @addr: the address to start counting from
+ *
+ * This function is atomic and may not be reordered.  See __set_bit()
+ * if you do not require the atomic guarantees.
+ * Note that @nr may be almost arbitrarily large; this function is not
+ * restricted to acting on a single-word quantity.
+ */
+
+#define set_bit(nr, addr)    (void)test_and_set_bit(nr, addr)
+
+#define __set_bit(nr, addr)    (void)__test_and_set_bit(nr, addr)
+
+/*
+ * clear_bit - Clears a bit in memory
+ * @nr: Bit to clear
+ * @addr: Address to start counting from
+ *
+ * clear_bit() is atomic and may not be reordered.  However, it does
+ * not contain a memory barrier, so if it is used for locking purposes,
+ * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
+ * in order to ensure changes are visible on other processors.
+ */
+
+#define clear_bit(nr, addr)  (void)test_and_clear_bit(nr, addr)
+
+#define __clear_bit(nr, addr)  (void)__test_and_clear_bit(nr, addr)
+
+/*
+ * change_bit - Toggle a bit in memory
+ * @nr: Bit to change
+ * @addr: Address to start counting from
+ *
+ * change_bit() is atomic and may not be reordered.
+ * Note that @nr may be almost arbitrarily large; this function is not
+ * restricted to acting on a single-word quantity.
+ */
+
+#define change_bit(nr, addr) (void)test_and_change_bit(nr, addr)
+
+/*
+ * __change_bit - Toggle a bit in memory
+ * @nr: the bit to change
+ * @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.
+ */
+
+#define __change_bit(nr, addr) (void)__test_and_change_bit(nr, addr)
+
+/**
+ * test_and_set_bit - Set a bit and return its old value
+ * @nr: Bit to set
+ * @addr: Address to count from
+ *
+ * This operation is atomic and cannot be reordered.  
+ * It also implies a memory barrier.
+ */
+
+extern inline int test_and_set_bit(int nr, void *addr)
+{
+        unsigned int mask, retval;
+        unsigned long flags;
+        unsigned int *adr = (unsigned int *)addr;
+        
+        adr += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        local_save_flags(flags);
+        local_irq_disable();
+        retval = (mask & *adr) != 0;
+        *adr |= mask;
+        local_irq_restore(flags);
+        return retval;
+}
+
+extern inline int __test_and_set_bit(int nr, void *addr)
+{
+        unsigned int mask, retval;
+        unsigned int *adr = (unsigned int *)addr;
+        
+        adr += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        retval = (mask & *adr) != 0;
+        *adr |= mask;
+        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()
+
+/**
+ * test_and_clear_bit - Clear a bit and return its old value
+ * @nr: Bit to clear
+ * @addr: Address to count from
+ *
+ * This operation is atomic and cannot be reordered.  
+ * It also implies a memory barrier.
+ */
+
+extern inline int test_and_clear_bit(int nr, void *addr)
+{
+        unsigned int mask, retval;
+        unsigned long flags;
+        unsigned int *adr = (unsigned int *)addr;
+        
+        adr += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        local_save_flags(flags);
+        local_irq_disable();
+        retval = (mask & *adr) != 0;
+        *adr &= ~mask;
+        local_irq_restore(flags);
+        return retval;
+}
+
+/**
+ * __test_and_clear_bit - Clear a bit and return its old value
+ * @nr: Bit to clear
+ * @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.
+ */
+
+extern inline int __test_and_clear_bit(int nr, void *addr)
+{
+        unsigned int mask, retval;
+        unsigned int *adr = (unsigned int *)addr;
+        
+        adr += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        retval = (mask & *adr) != 0;
+        *adr &= ~mask;
+        return retval;
+}
+/**
+ * test_and_change_bit - Change a bit and return its old value
+ * @nr: Bit to change
+ * @addr: Address to count from
+ *
+ * This operation is atomic and cannot be reordered.  
+ * It also implies a memory barrier.
+ */
+
+extern inline int test_and_change_bit(int nr, void *addr)
+{
+        unsigned int mask, retval;
+        unsigned long flags;
+        unsigned int *adr = (unsigned int *)addr;
+        adr += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        local_save_flags(flags);
+        local_irq_disable();
+        retval = (mask & *adr) != 0;
+        *adr ^= mask;
+        local_irq_restore(flags);
+        return retval;
+}
+
+/* WARNING: non atomic and it can be reordered! */
+
+extern inline int __test_and_change_bit(int nr, void *addr)
+{
+        unsigned int mask, retval;
+        unsigned int *adr = (unsigned int *)addr;
+
+        adr += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        retval = (mask & *adr) != 0;
+        *adr ^= mask;
+
+        return retval;
+}
+
+/**
+ * test_bit - Determine whether a bit is set
+ * @nr: bit number to test
+ * @addr: Address to start counting from
+ *
+ * This routine doesn't need to be atomic.
+ */
+
+extern inline int test_bit(int nr, const void *addr)
+{
+        unsigned int mask;
+        unsigned int *adr = (unsigned int *)addr;
+        
+        adr += nr >> 5;
+        mask = 1 << (nr & 0x1f);
+        return ((mask & *adr) != 0);
+}
+
+/*
+ * Find-bit routines..
+ */
+
+/*
+ * Since we define it "external", it collides with the built-in
+ * definition, which doesn't have the same semantics.  We don't want to
+ * use -fno-builtin, so just hide the name ffs.
+ */
+#define ffs kernel_ffs
+
+/*
+ * fls: find last bit set.
+ */
+
+#define fls(x) generic_fls(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)
+
+/**
+ * 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
+ */
+extern inline int find_next_zero_bit (void * addr, int size, int 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) {
+                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);
+}
+
+/**
+ * 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__ int find_next_bit(void *addr, int size, int 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) {
+                tmp = *(p++);
+                tmp &= (~0UL << 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 >> (32 - size));
+        if (tmp == 0UL)        /* Are any bits set? */
+                return result + size; /* Nope. */
+found_middle:
+        return result + __ffs(tmp);
+}
+
+/**
+ * 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)
+#define find_first_bit(addr, size) \
+        find_next_bit((addr), (size), 0)
+
+#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_set_bit(nr,addr) test_and_set_bit(nr,addr)
+#define minix_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)
+
+extern 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 (unlikely(b[3]))
+                return __ffs(b[3]) + 96;
+        if (b[4])
+                return __ffs(b[4]) + 128;
+        return __ffs(b[5]) + 32 + 128;
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _CRIS_BITOPS_H */