--- /dev/null
+/*
+ * U-boot - bitops.h Routines for bit operations
+ *
+ * Copyright (c) 2005-2007 Analog Devices Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _BLACKFIN_BITOPS_H
+#define _BLACKFIN_BITOPS_H
+
+/*
+ * Copyright 1992, Linus Torvalds.
+ */
+
+#include <asm/byteorder.h>
+#include <asm/system.h>
+
+#ifdef __KERNEL__
+/*
+ * Function prototypes to keep gcc -Wall happy
+ */
+
+/*
+ * The __ functions are not atomic
+ */
+
+/*
+ * 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)
+{
+ unsigned long result = 0;
+
+ while (word & 1) {
+ result++;
+ word >>= 1;
+ }
+ return result;
+}
+
+static __inline__ void set_bit(int nr, volatile void *addr)
+{
+ int *a = (int *)addr;
+ int mask;
+ 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 *a = (int *)addr;
+ int mask;
+
+ a += nr >> 5;
+ mask = 1 << (nr & 0x1f);
+ *a |= mask;
+}
+#define PLATFORM__SET_BIT
+
+/*
+ * 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 *a = (int *)addr;
+ int mask;
+ 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, flags;
+ unsigned long *ADDR = (unsigned long *)addr;
+
+ ADDR += nr >> 5;
+ mask = 1 << (nr & 31);
+ local_irq_save(flags);
+ *ADDR ^= mask;
+ local_irq_restore(flags);
+}
+
+static __inline__ void __change_bit(int nr, volatile void *addr)
+{
+ int mask;
+ unsigned long *ADDR = (unsigned long *)addr;
+
+ ADDR += nr >> 5;
+ mask = 1 << (nr & 31);
+ *ADDR ^= mask;
+}
+
+static __inline__ int test_and_set_bit(int nr, volatile void *addr)
+{
+ int mask, retval;
+ volatile unsigned int *a = (volatile unsigned int *)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 = (volatile unsigned int *)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 = (volatile unsigned int *)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 = (volatile unsigned int *)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 = (volatile unsigned int *)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 = (volatile unsigned int *)addr;
+
+ a += nr >> 5;
+ mask = 1 << (nr & 0x1f);
+ retval = (mask & *a) != 0;
+ *a ^= mask;
+ return retval;
+}
+
+/*
+ * This routine doesn't need to be atomic.
+ */
+static __inline__ int __constant_test_bit(int nr, const volatile void *addr)
+{
+ return ((1UL << (nr & 31)) &
+ (((const volatile unsigned int *)addr)[nr >> 5])) != 0;
+}
+
+static __inline__ int __test_bit(int nr, volatile void *addr)
+{
+ int *a = (int *)addr;
+ int mask;
+
+ a += nr >> 5;
+ mask = 1 << (nr & 0x1f);
+ return ((mask & *a) != 0);
+}
+
+#define test_bit(nr,addr) \
+(__builtin_constant_p(nr) ? \
+ __constant_test_bit((nr),(addr)) : \
+ __test_bit((nr),(addr)))
+
+#define find_first_zero_bit(addr, size) \
+ find_next_zero_bit((addr), (size), 0)
+
+static __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);
+}
+
+/*
+ * 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)
+
+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) {
+ 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);
+}
+
+/* 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
+
+#endif
Code Review / kvmfornfv.git / blobdiff