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278d91c460
Make the FPU operate in non-lazy mode under SMP so that when the process that is currently using the FPU migrates to a different CPU, we don't have to ping its previous CPU to flush the FPU context. Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com> Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com>
40 lines
1.1 KiB
ArmAsm
40 lines
1.1 KiB
ArmAsm
/* MN10300 Low level FPU management operations
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/linkage.h>
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#include <asm/cpu-regs.h>
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#include <asm/smp.h>
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#include <asm/thread_info.h>
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#include <asm/asm-offsets.h>
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#include <asm/frame.inc>
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###############################################################################
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#
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# void fpu_disabled(void)
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# - handle an exception due to the FPU being disabled
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# when CONFIG_FPU is disabled
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#
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###############################################################################
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.type fpu_disabled,@function
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.globl fpu_disabled
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fpu_disabled:
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add -4,sp
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SAVE_ALL
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mov -1,d0
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mov d0,(REG_ORIG_D0,fp)
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and ~EPSW_NMID,epsw
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mov fp,d0
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call unexpected_fpu_exception[],0
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jmp ret_from_exception
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.size fpu_disabled,.-fpu_disabled
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