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-rw-r--r--com32/include/sys/bitops.h58
1 files changed, 58 insertions, 0 deletions
diff --git a/com32/include/sys/bitops.h b/com32/include/sys/bitops.h
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+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2010 Intel Corporation; author: H. Peter Anvin
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall
+ * be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * bitops.h
+ *
+ * Simple bitwise operations
+ */
+
+#ifndef _BITOPS_H
+#define _BITOPS_H
+
+#include <klibc/compiler.h>
+
+static inline void set_bit(long __bit, void *__bitmap)
+{
+ asm volatile("btsl %1,%0" : "+m" (__bitmap) : "Ir" (__bit) : "memory");
+}
+
+static inline void clr_bit(long __bit, void *__bitmap)
+{
+ asm volatile("btcl %1,%0" : "+m" (__bitmap) : "Ir" (__bit) : "memory");
+}
+
+static inline int __purefunc test_bit(long __bit, const void *__bitmap)
+{
+ unsigned char __r;
+ asm("btl %2,%1; setnz %0"
+ : "=r" (__r)
+ : "m" (__bitmap), "Ir" (__bit));
+ return __r;
+}
+
+#endif /* _BITOPS_H */