patch-2.4.2 linux/arch/s390x/kernel/s390fpu.c

• Lines: 88
• Date: Tue Feb 13 14:13:44 2001
• Orig file: v2.4.1/linux/arch/s390x/kernel/s390fpu.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/arch/s390x/kernel/s390fpu.c linux/arch/s390x/kernel/s390fpu.c
@@ -0,0 +1,87 @@
+/*
+ *  arch/s390/kernel/s390fpu.c
+ *
+ *  S390 version
+ *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
+ *
+ *  s390fpu.h functions for saving & restoring the fpu state.
+ *
+ *  I couldn't inline these as linux/sched.h included half the world
+ *  & was required to at the task structure.
+ *  & the functions were too complex to make macros from.
+ *  ( & as usual I didn't feel like debugging inline code ).
+ */
+
+#include <linux/sched.h>
+
+void save_fp_regs(s390_fp_regs *fpregs)
+{
+/*
+ * I don't think we can use STE here as this would load
+ * fp registers 0 & 2 into memory locations 0 & 1 etc. 
+ */	
+	asm volatile ("STFPC 0(%0)\n\t"
+		      "STD   0,8(%0)\n\t"
+		      "STD   1,16(%0)\n\t"
+		      "STD   2,24(%0)\n\t"
+		      "STD   3,32(%0)\n\t"
+		      "STD   4,40(%0)\n\t"
+		      "STD   5,48(%0)\n\t"
+		      "STD   6,56(%0)\n\t"
+		      "STD   7,64(%0)\n\t"
+		      "STD   8,72(%0)\n\t"
+		      "STD   9,80(%0)\n\t"
+		      "STD   10,88(%0)\n\t"
+		      "STD   11,96(%0)\n\t"
+		      "STD   12,104(%0)\n\t"
+		      "STD   13,112(%0)\n\t"
+		      "STD   14,120(%0)\n\t"
+		      "STD   15,128(%0)\n\t"
+                      : 
+		      : "a" (fpregs)
+		      : "memory"
+		);
+}
+
+void restore_fp_regs(s390_fp_regs *fpregs)
+{
+	/* If we don't mask with the FPC_VALID_MASK here
+	 * we've got a very quick shutdown -h now command
+         * via a kernel specification exception.
+	 */
+	fpregs->fpc&=FPC_VALID_MASK;
+	asm volatile ("LFPC 0(%0)\n\t"
+		      "LD   0,8(%0)\n\t"
+		      "LD   1,16(%0)\n\t"
+		      "LD   2,24(%0)\n\t"
+		      "LD   3,32(%0)\n\t"
+		      "LD   4,40(%0)\n\t"
+		      "LD   5,48(%0)\n\t"
+		      "LD   6,56(%0)\n\t"
+		      "LD   7,64(%0)\n\t"
+		      "LD   8,72(%0)\n\t"
+		      "LD   9,80(%0)\n\t"
+		      "LD   10,88(%0)\n\t"
+		      "LD   11,96(%0)\n\t"
+		      "LD   12,104(%0)\n\t"
+		      "LD   13,112(%0)\n\t"
+		      "LD   14,120(%0)\n\t"
+		      "LD   15,128(%0)\n\t"
+                      : 
+		      : "a" (fpregs)
+		      : "memory"
+		);
+}
+
+
+
+
+
+
+
+
+
+
+
+