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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>
259 lines
5.1 KiB
ArmAsm
259 lines
5.1 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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.macro FPU_INIT_STATE_ALL
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fmov 0,fs0
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fmov fs0,fs1
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fmov fs0,fs2
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fmov fs0,fs3
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fmov fs0,fs4
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fmov fs0,fs5
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fmov fs0,fs6
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fmov fs0,fs7
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fmov fs0,fs8
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fmov fs0,fs9
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fmov fs0,fs10
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fmov fs0,fs11
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fmov fs0,fs12
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fmov fs0,fs13
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fmov fs0,fs14
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fmov fs0,fs15
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fmov fs0,fs16
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fmov fs0,fs17
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fmov fs0,fs18
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fmov fs0,fs19
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fmov fs0,fs20
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fmov fs0,fs21
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fmov fs0,fs22
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fmov fs0,fs23
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fmov fs0,fs24
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fmov fs0,fs25
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fmov fs0,fs26
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fmov fs0,fs27
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fmov fs0,fs28
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fmov fs0,fs29
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fmov fs0,fs30
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fmov fs0,fs31
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fmov FPCR_INIT,fpcr
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.endm
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.macro FPU_SAVE_ALL areg,dreg
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fmov fs0,(\areg+)
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fmov fs1,(\areg+)
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fmov fs2,(\areg+)
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fmov fs3,(\areg+)
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fmov fs4,(\areg+)
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fmov fs5,(\areg+)
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fmov fs6,(\areg+)
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fmov fs7,(\areg+)
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fmov fs8,(\areg+)
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fmov fs9,(\areg+)
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fmov fs10,(\areg+)
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fmov fs11,(\areg+)
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fmov fs12,(\areg+)
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fmov fs13,(\areg+)
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fmov fs14,(\areg+)
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fmov fs15,(\areg+)
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fmov fs16,(\areg+)
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fmov fs17,(\areg+)
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fmov fs18,(\areg+)
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fmov fs19,(\areg+)
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fmov fs20,(\areg+)
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fmov fs21,(\areg+)
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fmov fs22,(\areg+)
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fmov fs23,(\areg+)
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fmov fs24,(\areg+)
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fmov fs25,(\areg+)
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fmov fs26,(\areg+)
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fmov fs27,(\areg+)
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fmov fs28,(\areg+)
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fmov fs29,(\areg+)
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fmov fs30,(\areg+)
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fmov fs31,(\areg+)
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fmov fpcr,\dreg
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mov \dreg,(\areg)
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.endm
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.macro FPU_RESTORE_ALL areg,dreg
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fmov (\areg+),fs0
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fmov (\areg+),fs1
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fmov (\areg+),fs2
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fmov (\areg+),fs3
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fmov (\areg+),fs4
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fmov (\areg+),fs5
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fmov (\areg+),fs6
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fmov (\areg+),fs7
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fmov (\areg+),fs8
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fmov (\areg+),fs9
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fmov (\areg+),fs10
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fmov (\areg+),fs11
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fmov (\areg+),fs12
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fmov (\areg+),fs13
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fmov (\areg+),fs14
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fmov (\areg+),fs15
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fmov (\areg+),fs16
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fmov (\areg+),fs17
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fmov (\areg+),fs18
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fmov (\areg+),fs19
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fmov (\areg+),fs20
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fmov (\areg+),fs21
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fmov (\areg+),fs22
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fmov (\areg+),fs23
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fmov (\areg+),fs24
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fmov (\areg+),fs25
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fmov (\areg+),fs26
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fmov (\areg+),fs27
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fmov (\areg+),fs28
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fmov (\areg+),fs29
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fmov (\areg+),fs30
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fmov (\areg+),fs31
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mov (\areg),\dreg
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fmov \dreg,fpcr
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.endm
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###############################################################################
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#
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# void fpu_init_state(void)
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# - initialise the FPU
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#
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###############################################################################
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.globl fpu_init_state
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.type fpu_init_state,@function
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fpu_init_state:
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mov epsw,d0
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or EPSW_FE,epsw
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#ifdef CONFIG_MN10300_PROC_MN103E010
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nop
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nop
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nop
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#endif
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FPU_INIT_STATE_ALL
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#ifdef CONFIG_MN10300_PROC_MN103E010
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nop
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nop
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nop
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#endif
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mov d0,epsw
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ret [],0
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.size fpu_init_state,.-fpu_init_state
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###############################################################################
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#
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# void fpu_save(struct fpu_state_struct *)
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# - save the fpu state
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# - note that an FPU Operational exception might occur during this process
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#
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###############################################################################
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.globl fpu_save
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.type fpu_save,@function
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fpu_save:
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mov epsw,d1
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or EPSW_FE,epsw /* enable the FPU so we can access it */
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#ifdef CONFIG_MN10300_PROC_MN103E010
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nop
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nop
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#endif
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mov d0,a0
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FPU_SAVE_ALL a0,d0
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#ifdef CONFIG_MN10300_PROC_MN103E010
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nop
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nop
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#endif
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mov d1,epsw
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ret [],0
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.size fpu_save,.-fpu_save
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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 enabled
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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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or EPSW_nAR|EPSW_FE,epsw
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nop
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nop
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nop
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mov sp,a1
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mov (a1),d1 /* get epsw of user context */
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and ~(THREAD_SIZE-1),a1 /* a1: (thread_info *ti) */
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mov (TI_task,a1),a2 /* a2: (task_struct *tsk) */
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btst EPSW_nSL,d1
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beq fpu_used_in_kernel
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or EPSW_FE,d1
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mov d1,(sp)
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mov (TASK_THREAD+THREAD_FPU_FLAGS,a2),d1
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#ifndef CONFIG_LAZY_SAVE_FPU
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or __THREAD_HAS_FPU,d1
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mov d1,(TASK_THREAD+THREAD_FPU_FLAGS,a2)
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#else /* !CONFIG_LAZY_SAVE_FPU */
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mov (fpu_state_owner),a0
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cmp 0,a0
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beq fpu_regs_save_end
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mov (TASK_THREAD+THREAD_UREGS,a0),a1
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add TASK_THREAD+THREAD_FPU_STATE,a0
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FPU_SAVE_ALL a0,d0
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mov (REG_EPSW,a1),d0
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and ~EPSW_FE,d0
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mov d0,(REG_EPSW,a1)
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fpu_regs_save_end:
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mov a2,(fpu_state_owner)
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#endif /* !CONFIG_LAZY_SAVE_FPU */
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btst __THREAD_USING_FPU,d1
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beq fpu_regs_init
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add TASK_THREAD+THREAD_FPU_STATE,a2
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FPU_RESTORE_ALL a2,d0
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rti
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fpu_regs_init:
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FPU_INIT_STATE_ALL
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add TASK_THREAD+THREAD_FPU_FLAGS,a2
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bset __THREAD_USING_FPU,(0,a2)
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rti
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fpu_used_in_kernel:
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and ~(EPSW_nAR|EPSW_FE),epsw
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nop
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nop
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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 fpu_disabled_in_kernel[],0
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jmp ret_from_exception
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.size fpu_disabled,.-fpu_disabled
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