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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)
{
static int first = 1;
int i;
if (first) {
first = 0;
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;
}
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