summaryrefslogtreecommitdiff
path: root/include/asm-v850/bitops.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-v850/bitops.h')
-rw-r--r--include/asm-v850/bitops.h355
1 files changed, 355 insertions, 0 deletions
diff --git a/include/asm-v850/bitops.h b/include/asm-v850/bitops.h
new file mode 100644
index 000000000000..7c4ecaf5151c
--- /dev/null
+++ b/include/asm-v850/bitops.h
@@ -0,0 +1,355 @@
+/*
+ * include/asm-v850/bitops.h -- Bit operations
+ *
+ * Copyright (C) 2001,02,03,04 NEC Electronics Corporation
+ * Copyright (C) 2001,02,03,04 Miles Bader <miles@gnu.org>
+ * Copyright (C) 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.
+ */
+
+#ifndef __V850_BITOPS_H__
+#define __V850_BITOPS_H__
+
+
+#include <linux/config.h>
+#include <linux/compiler.h> /* unlikely */
+#include <asm/byteorder.h> /* swab32 */
+#include <asm/system.h> /* interrupt enable/disable */
+
+
+#ifdef __KERNEL__
+
+/*
+ * The __ functions are not atomic
+ */
+
+/*
+ * ffz = Find First Zero in word. Undefined if no zero exists,
+ * so code should check against ~0UL first..
+ */
+extern __inline__ unsigned long ffz (unsigned long word)
+{
+ unsigned long result = 0;
+
+ while (word & 1) {
+ result++;
+ word >>= 1;
+ }
+ return result;
+}
+
+
+/* In the following constant-bit-op macros, a "g" constraint is used when
+ we really need an integer ("i" constraint). This is to avoid
+ warnings/errors from the compiler in the case where the associated
+ operand _isn't_ an integer, and shouldn't produce bogus assembly because
+ use of that form is protected by a guard statement that checks for
+ constants, and should otherwise be removed by the optimizer. This
+ _usually_ works -- however, __builtin_constant_p returns true for a
+ variable with a known constant value too, and unfortunately gcc will
+ happily put the variable in a register and use the register for the "g"
+ constraint'd asm operand. To avoid the latter problem, we add a
+ constant offset to the operand and subtract it back in the asm code;
+ forcing gcc to do arithmetic on the value is usually enough to get it
+ to use a real constant value. This is horrible, and ultimately
+ unreliable too, but it seems to work for now (hopefully gcc will offer
+ us more control in the future, so we can do a better job). */
+
+#define __const_bit_op(op, nr, addr) \
+ ({ __asm__ (op " (%0 - 0x123), %1" \
+ :: "g" (((nr) & 0x7) + 0x123), \
+ "m" (*((char *)(addr) + ((nr) >> 3))) \
+ : "memory"); })
+#define __var_bit_op(op, nr, addr) \
+ ({ int __nr = (nr); \
+ __asm__ (op " %0, [%1]" \
+ :: "r" (__nr & 0x7), \
+ "r" ((char *)(addr) + (__nr >> 3)) \
+ : "memory"); })
+#define __bit_op(op, nr, addr) \
+ ((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF) \
+ ? __const_bit_op (op, nr, addr) \
+ : __var_bit_op (op, nr, addr))
+
+#define __set_bit(nr, addr) __bit_op ("set1", nr, addr)
+#define __clear_bit(nr, addr) __bit_op ("clr1", nr, addr)
+#define __change_bit(nr, addr) __bit_op ("not1", nr, addr)
+
+/* The bit instructions used by `non-atomic' variants are actually atomic. */
+#define set_bit __set_bit
+#define clear_bit __clear_bit
+#define change_bit __change_bit
+
+
+#define __const_tns_bit_op(op, nr, addr) \
+ ({ int __tns_res; \
+ __asm__ __volatile__ ( \
+ "tst1 (%1 - 0x123), %2; setf nz, %0; " op " (%1 - 0x123), %2" \
+ : "=&r" (__tns_res) \
+ : "g" (((nr) & 0x7) + 0x123), \
+ "m" (*((char *)(addr) + ((nr) >> 3))) \
+ : "memory"); \
+ __tns_res; \
+ })
+#define __var_tns_bit_op(op, nr, addr) \
+ ({ int __nr = (nr); \
+ int __tns_res; \
+ __asm__ __volatile__ ( \
+ "tst1 %1, [%2]; setf nz, %0; " op " %1, [%2]" \
+ : "=&r" (__tns_res) \
+ : "r" (__nr & 0x7), \
+ "r" ((char *)(addr) + (__nr >> 3)) \
+ : "memory"); \
+ __tns_res; \
+ })
+#define __tns_bit_op(op, nr, addr) \
+ ((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF) \
+ ? __const_tns_bit_op (op, nr, addr) \
+ : __var_tns_bit_op (op, nr, addr))
+#define __tns_atomic_bit_op(op, nr, addr) \
+ ({ int __tns_atomic_res, __tns_atomic_flags; \
+ local_irq_save (__tns_atomic_flags); \
+ __tns_atomic_res = __tns_bit_op (op, nr, addr); \
+ local_irq_restore (__tns_atomic_flags); \
+ __tns_atomic_res; \
+ })
+
+#define __test_and_set_bit(nr, addr) __tns_bit_op ("set1", nr, addr)
+#define test_and_set_bit(nr, addr) __tns_atomic_bit_op ("set1", nr, addr)
+
+#define __test_and_clear_bit(nr, addr) __tns_bit_op ("clr1", nr, addr)
+#define test_and_clear_bit(nr, addr) __tns_atomic_bit_op ("clr1", nr, addr)
+
+#define __test_and_change_bit(nr, addr) __tns_bit_op ("not1", nr, addr)
+#define test_and_change_bit(nr, addr) __tns_atomic_bit_op ("not1", nr, addr)
+
+
+#define __const_test_bit(nr, addr) \
+ ({ int __test_bit_res; \
+ __asm__ __volatile__ ("tst1 (%1 - 0x123), %2; setf nz, %0" \
+ : "=r" (__test_bit_res) \
+ : "g" (((nr) & 0x7) + 0x123), \
+ "m" (*((const char *)(addr) + ((nr) >> 3)))); \
+ __test_bit_res; \
+ })
+extern __inline__ int __test_bit (int nr, const void *addr)
+{
+ int res;
+ __asm__ __volatile__ ("tst1 %1, [%2]; setf nz, %0"
+ : "=r" (res)
+ : "r" (nr & 0x7), "r" (addr + (nr >> 3)));
+ return res;
+}
+#define test_bit(nr,addr) \
+ ((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF) \
+ ? __const_test_bit ((nr), (addr)) \
+ : __test_bit ((nr), (addr)))
+
+
+/* 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 find_first_zero_bit(addr, size) \
+ find_next_zero_bit ((addr), (size), 0)
+
+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);
+}
+
+
+/* This is the same as generic_ffs, but we can't use that because it's
+ inline and the #include order mucks things up. */
+static inline int generic_ffs_for_find_next_bit(int x)
+{
+ int r = 1;
+
+ if (!x)
+ return 0;
+ if (!(x & 0xffff)) {
+ x >>= 16;
+ r += 16;
+ }
+ if (!(x & 0xff)) {
+ x >>= 8;
+ r += 8;
+ }
+ if (!(x & 0xf)) {
+ x >>= 4;
+ r += 4;
+ }
+ if (!(x & 3)) {
+ x >>= 2;
+ r += 2;
+ }
+ if (!(x & 1)) {
+ x >>= 1;
+ r += 1;
+ }
+ return r;
+}
+
+/*
+ * Find next one bit in a bitmap reasonably efficiently.
+ */
+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 + generic_ffs_for_find_next_bit(tmp);
+}
+
+/*
+ * find_first_bit - find the first set bit in a memory region
+ */
+#define find_first_bit(addr, size) \
+ find_next_bit((addr), (size), 0)
+
+
+#define ffs(x) generic_ffs (x)
+#define fls(x) generic_fls (x)
+#define __ffs(x) ffs(x)
+
+
+/*
+ * This is just `generic_ffs' from <linux/bitops.h>, except that it assumes
+ * that at least one bit is set, and returns the real index of the bit
+ * (rather than the bit index + 1, like ffs does).
+ */
+static inline int sched_ffs(int x)
+{
+ int r = 0;
+
+ if (!(x & 0xffff)) {
+ x >>= 16;
+ r += 16;
+ }
+ if (!(x & 0xff)) {
+ x >>= 8;
+ r += 8;
+ }
+ if (!(x & 0xf)) {
+ x >>= 4;
+ r += 4;
+ }
+ if (!(x & 3)) {
+ x >>= 2;
+ r += 2;
+ }
+ if (!(x & 1)) {
+ x >>= 1;
+ r += 1;
+ }
+ return r;
+}
+
+/*
+ * 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 int sched_find_first_bit(unsigned long *b)
+{
+ unsigned offs = 0;
+ while (! *b) {
+ b++;
+ offs += 32;
+ }
+ return sched_ffs (*b) + offs;
+}
+
+/*
+ * 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)
+
+#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 test_and_set_bit
+#define minix_set_bit set_bit
+#define minix_test_and_clear_bit test_and_clear_bit
+#define minix_test_bit test_bit
+#define minix_find_first_zero_bit find_first_zero_bit
+
+#endif /* __KERNEL__ */
+
+#endif /* __V850_BITOPS_H__ */
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-15 19:51:05 +0300