From 889b6c4c11911ab87d3470d9ffc9b559183a51dc Mon Sep 17 00:00:00 2001
From: Jason Downs <downsj@cvs.openbsd.org>
Date: Tue, 27 Aug 1996 10:46:56 +0000
Subject: Add: 	* GPL_MATH_EMULATE: fpemul 	* ALWAYS_MATH_EMULATE: causes
 npx probe to always fail. 	* better fp context in struct pcb.

---
 sys/arch/i386/include/cpu.h |  2 +-
 sys/arch/i386/include/npx.h | 28 ++++++++++++++++++++--------
 sys/arch/i386/include/pcb.h |  2 +-
 3 files changed, 22 insertions(+), 10 deletions(-)

(limited to 'sys/arch/i386/include')

diff --git a/sys/arch/i386/include/cpu.h b/sys/arch/i386/include/cpu.h
index 3abe70557f5..8cf15de524c 100644
--- a/sys/arch/i386/include/cpu.h
+++ b/sys/arch/i386/include/cpu.h
@@ -165,7 +165,7 @@ void	startrtclock __P((void));
 void	npxdrop __P((void));
 void	npxsave __P((void));
 
-#ifdef MATH_EMULATE
+#if defined(MATH_EMULATE) || defined(GPL_MATH_EMULATE)
 /* math_emulate.c */
 int	math_emulate __P((struct trapframe *));
 #endif
diff --git a/sys/arch/i386/include/npx.h b/sys/arch/i386/include/npx.h
index 58feae9ea33..5d23bcf7d0d 100644
--- a/sys/arch/i386/include/npx.h
+++ b/sys/arch/i386/include/npx.h
@@ -70,14 +70,25 @@ struct	fpacc87 {
 #endif
 };
 
-/* Floating point context */
+#ifdef GPL_MATH_EMULATE
+#include <gnu/arch/i386/fpemul/math_emu.h>
+#endif
+
+/* Floating point and emulator context */
 struct	save87 {
 	struct	env87 sv_env;		/* floating point control/status */
-	struct	fpacc87	sv_ac[8];	/* accumulator contents, 0-7 */
-#ifndef dontdef
-	u_long	sv_ex_sw;	/* status word for last exception (was pad) */
-	u_long	sv_ex_tw;	/* tag word for last exception (was pad) */
-	u_char	sv_pad[8 * 2 - 2 * 4];	/* bogus historical padding */
+	struct	fpacc87 sv_ac[8];	/* accumulator contents, 0-7 */
+	u_long	sv_ex_sw;		/* status word for last exception */
+	u_long	sv_ex_tw;		/* tag word for last exception */
+};
+
+/* For the pcb. */
+union	fsave87 {
+	struct	save87 npx;
+#ifdef GPL_MATH_EMULATE
+	union i387_union gplemu;
+#else
+	u_char emupad[176];		/* sizeof(i387_union) */
 #endif
 };
 
@@ -90,7 +101,8 @@ struct	emcsts {
 
 /* Intel prefers long real (53 bit) precision */
 #define	__iBCS_NPXCW__		0x262
-#define	__NetBSD_NPXCW__	0x127f
+#define __BDE_NPXCW__		0x1272		/* FreeBSD */
+#define	__OpenBSD_NPXCW__	0x127f
 
 /*
  * The standard control word from finit is 0x37F, giving:
@@ -115,6 +127,6 @@ struct	emcsts {
  * trapping denormals.
  */
 
-#define	__INITIAL_NPXCW__	__NetBSD_NPXCW__
+#define	__INITIAL_NPXCW__	__OpenBSD_NPXCW__
 
 #endif /* !_I386_NPX_H_ */
diff --git a/sys/arch/i386/include/pcb.h b/sys/arch/i386/include/pcb.h
index 3cff2b28c2d..33ea0e21661 100644
--- a/sys/arch/i386/include/pcb.h
+++ b/sys/arch/i386/include/pcb.h
@@ -67,7 +67,7 @@ struct pcb {
         union	descriptor *pcb_ldt;	/* per process (user) LDT */
         int	pcb_ldt_len;		/*      number of LDT entries */
 	int	pcb_cr0;		/* saved image of CR0 */
-	struct	save87 pcb_savefpu;	/* floating point state for 287/387 */
+	union	fsave87 pcb_savefpu;	/* floating point state for 287/387 */
 	struct	emcsts pcb_saveemc;	/* Cyrix EMC state */
 /*
  * Software pcb (extension)
-- 
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