FPU support.

Obtained from:	NetBSD (portions)

4 files changed, 40 insertions, 1 deletions

diff --git a/sys/powerpc/include/fpu.h b/sys/powerpc/include/fpu.h
index 1f23caa..c01637b 100644
--- a/sys/powerpc/include/fpu.h
+++ b/sys/powerpc/include/fpu.h
@@ -68,4 +68,15 @@
 #define	FPSCR_NI	0x00000004
 #define	FPSCR_RN	0x00000003
 
+#ifdef _KERNEL
+
+/* List of PowerPC architectures that support FPUs. */
+#if defined(MPC750)
+#define PPC_HAVE_FPU
+
+void    enable_fpu(struct thread *);
+void    save_fpu(struct thread *);
+#endif /* PPC_HAVE_FPU */
+#endif /* _KERNEL */
+
 #endif	/* _MACHINE_FPU_H_ */
diff --git a/sys/powerpc/include/ieeefp.h b/sys/powerpc/include/ieeefp.h
new file mode 100644
index 0000000..42701e2
--- /dev/null
+++ b/sys/powerpc/include/ieeefp.h
@@ -0,0 +1,25 @@
+/* 
+ * Written by J.T. Conklin, Apr 6, 1995
+ * Public domain.
+ * $NetBSD: ieeefp.h,v 1.2 1999/07/07 01:52:26 danw Exp $
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_IEEEFP_H_
+#define _MACHINE_IEEEFP_H_
+
+typedef int fp_except_t;
+#define FP_X_IMP	0x01	/* imprecise (loss of precision) */
+#define FP_X_DZ		0x02	/* divide-by-zero exception */
+#define FP_X_UFL	0x04	/* underflow exception */
+#define FP_X_OFL	0x08	/* overflow exception */
+#define FP_X_INV	0x10	/* invalid operation exception */
+
+typedef enum {
+    FP_RN=0,			/* round to nearest representable number */
+    FP_RZ=1,			/* round to zero (truncate) */
+    FP_RP=2,			/* round toward positive infinity */
+    FP_RM=3			/* round toward negative infinity */
+} fp_rnd_t;
+
+#endif /* _MACHINE_IEEEFP_H_ */
diff --git a/sys/powerpc/include/pcb.h b/sys/powerpc/include/pcb.h
index fbd7cbf..41ec35c 100644
--- a/sys/powerpc/include/pcb.h
+++ b/sys/powerpc/include/pcb.h
@@ -52,6 +52,8 @@ struct pcb {
 		double	fpr[32];
 		double	fpscr;	/* FPSCR stored as double for easier access */
 	} pcb_fpu;		/* Floating point processor */
+	unsigned int	pcb_fpcpu;		/* which CPU had our FPU
+							stuff. */
 };
 
 struct md_coredump {
diff --git a/sys/powerpc/include/pcpu.h b/sys/powerpc/include/pcpu.h
index c222ee0..a2c88c4 100644
--- a/sys/powerpc/include/pcpu.h
+++ b/sys/powerpc/include/pcpu.h
@@ -39,7 +39,8 @@ struct pmap;
 	int		pc_inside_intr;					\
 	u_int32_t	pc_next_asn;		/* next ASN to alloc */	\
 	u_int32_t	pc_current_asngen;	/* ASN rollover check */\
-	struct pmap	*pc_curpmap		/* current pmap */
+	struct pmap	*pc_curpmap;		/* current pmap */	\
+	struct thread	*pc_fputhread		/* current user of the fpu */
 
 #define PCPUP	((struct pcpu *) powerpc_get_pcpup())