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-rw-r--r--arch/mips/math-emu/kernel_linkage.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/arch/mips/math-emu/kernel_linkage.c b/arch/mips/math-emu/kernel_linkage.c
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index 000000000..93c84f8b0
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+++ b/arch/mips/math-emu/kernel_linkage.c
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+/**************************************************************************
+ *
+ * arch/mips/math_emu/kernel_linkage.c
+ *
+ * Kevin D. Kissell, kevink@mips and Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
+ *
+ * ########################################################################
+ *
+ * This program is free software; you can distribute it and/or modify it
+ * under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ *************************************************************************/
+/*
+ * Routines corresponding to Linux kernel FP context
+ * manipulation primitives for the Algorithmics MIPS
+ * FPU Emulator
+ */
+
+#include <linux/sched.h>
+#include <asm/processor.h>
+#include <asm/signal.h>
+#include <asm/uaccess.h>
+
+#include <asm/fpu_emulator.h>
+
+extern struct mips_fpu_emulator_private fpuemuprivate;
+
+#define SIGNALLING_NAN 0x7ff800007ff80000LL
+
+void fpu_emulator_init_fpu(void)
+{
+ int i;
+
+/* printk("Algorithmics/MIPS FPU Emulator v1.4\n");*/
+ current->thread.fpu.soft.sr = 0;
+ for (i = 0; i < 32; i++) {
+ current->thread.fpu.soft.regs[i] = SIGNALLING_NAN;
+ }
+}
+
+
+/*
+ * Emulator context save/restore to/from a signal context
+ * presumed to be on the user stack, and therefore accessed
+ * with appropriate macros from uaccess.h
+ */
+
+int fpu_emulator_save_context(struct sigcontext *sc)
+{
+ int i;
+ int err = 0;
+
+ for (i = 0; i < 32; i++) {
+ err |=
+ __put_user(current->thread.fpu.soft.regs[i],
+ &sc->sc_fpregs[i]);
+ }
+ err |= __put_user(current->thread.fpu.soft.sr, &sc->sc_fpc_csr);
+ err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
+
+ return err;
+}
+
+int fpu_emulator_restore_context(struct sigcontext *sc)
+{
+ int i;
+ int err = 0;
+
+ for (i = 0; i < 32; i++) {
+ err |=
+ __get_user(current->thread.fpu.soft.regs[i],
+ &sc->sc_fpregs[i]);
+ }
+ err |= __get_user(current->thread.fpu.soft.sr, &sc->sc_fpc_csr);
+ err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
+
+ return err;
+}