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-rw-r--r--kernel/arch/x86/math-emu/control_w.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/kernel/arch/x86/math-emu/control_w.h b/kernel/arch/x86/math-emu/control_w.h
new file mode 100644
index 000000000..ae2274dbd
--- /dev/null
+++ b/kernel/arch/x86/math-emu/control_w.h
@@ -0,0 +1,45 @@
+/*---------------------------------------------------------------------------+
+ | control_w.h |
+ | |
+ | Copyright (C) 1992,1993 |
+ | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
+ | Australia. E-mail billm@vaxc.cc.monash.edu.au |
+ | |
+ +---------------------------------------------------------------------------*/
+
+#ifndef _CONTROLW_H_
+#define _CONTROLW_H_
+
+#ifdef __ASSEMBLY__
+#define _Const_(x) $##x
+#else
+#define _Const_(x) x
+#endif
+
+#define CW_RC _Const_(0x0C00) /* rounding control */
+#define CW_PC _Const_(0x0300) /* precision control */
+
+#define CW_Precision Const_(0x0020) /* loss of precision mask */
+#define CW_Underflow Const_(0x0010) /* underflow mask */
+#define CW_Overflow Const_(0x0008) /* overflow mask */
+#define CW_ZeroDiv Const_(0x0004) /* divide by zero mask */
+#define CW_Denormal Const_(0x0002) /* denormalized operand mask */
+#define CW_Invalid Const_(0x0001) /* invalid operation mask */
+
+#define CW_Exceptions _Const_(0x003f) /* all masks */
+
+#define RC_RND _Const_(0x0000)
+#define RC_DOWN _Const_(0x0400)
+#define RC_UP _Const_(0x0800)
+#define RC_CHOP _Const_(0x0C00)
+
+/* p 15-5: Precision control bits affect only the following:
+ ADD, SUB(R), MUL, DIV(R), and SQRT */
+#define PR_24_BITS _Const_(0x000)
+#define PR_53_BITS _Const_(0x200)
+#define PR_64_BITS _Const_(0x300)
+#define PR_RESERVED_BITS _Const_(0x100)
+/* FULL_PRECISION simulates all exceptions masked */
+#define FULL_PRECISION (PR_64_BITS | RC_RND | 0x3f)
+
+#endif /* _CONTROLW_H_ */