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| /* MN10300 Low level FPU management operations
| *
| * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
| * Written by David Howells (dhowells@redhat.com)
| *
| * This program is free software; you can redistribute it and/or
| * modify it under the terms of the GNU General Public Licence
| * as published by the Free Software Foundation; either version
| * 2 of the Licence, or (at your option) any later version.
| */
| #include <linux/linkage.h>
| #include <asm/cpu-regs.h>
| #include <asm/smp.h>
| #include <asm/thread_info.h>
| #include <asm/asm-offsets.h>
| #include <asm/frame.inc>
|
| .macro FPU_INIT_STATE_ALL
| fmov 0,fs0
| fmov fs0,fs1
| fmov fs0,fs2
| fmov fs0,fs3
| fmov fs0,fs4
| fmov fs0,fs5
| fmov fs0,fs6
| fmov fs0,fs7
| fmov fs0,fs8
| fmov fs0,fs9
| fmov fs0,fs10
| fmov fs0,fs11
| fmov fs0,fs12
| fmov fs0,fs13
| fmov fs0,fs14
| fmov fs0,fs15
| fmov fs0,fs16
| fmov fs0,fs17
| fmov fs0,fs18
| fmov fs0,fs19
| fmov fs0,fs20
| fmov fs0,fs21
| fmov fs0,fs22
| fmov fs0,fs23
| fmov fs0,fs24
| fmov fs0,fs25
| fmov fs0,fs26
| fmov fs0,fs27
| fmov fs0,fs28
| fmov fs0,fs29
| fmov fs0,fs30
| fmov fs0,fs31
| fmov FPCR_INIT,fpcr
| .endm
|
| .macro FPU_SAVE_ALL areg,dreg
| fmov fs0,(\areg+)
| fmov fs1,(\areg+)
| fmov fs2,(\areg+)
| fmov fs3,(\areg+)
| fmov fs4,(\areg+)
| fmov fs5,(\areg+)
| fmov fs6,(\areg+)
| fmov fs7,(\areg+)
| fmov fs8,(\areg+)
| fmov fs9,(\areg+)
| fmov fs10,(\areg+)
| fmov fs11,(\areg+)
| fmov fs12,(\areg+)
| fmov fs13,(\areg+)
| fmov fs14,(\areg+)
| fmov fs15,(\areg+)
| fmov fs16,(\areg+)
| fmov fs17,(\areg+)
| fmov fs18,(\areg+)
| fmov fs19,(\areg+)
| fmov fs20,(\areg+)
| fmov fs21,(\areg+)
| fmov fs22,(\areg+)
| fmov fs23,(\areg+)
| fmov fs24,(\areg+)
| fmov fs25,(\areg+)
| fmov fs26,(\areg+)
| fmov fs27,(\areg+)
| fmov fs28,(\areg+)
| fmov fs29,(\areg+)
| fmov fs30,(\areg+)
| fmov fs31,(\areg+)
| fmov fpcr,\dreg
| mov \dreg,(\areg)
| .endm
|
| .macro FPU_RESTORE_ALL areg,dreg
| fmov (\areg+),fs0
| fmov (\areg+),fs1
| fmov (\areg+),fs2
| fmov (\areg+),fs3
| fmov (\areg+),fs4
| fmov (\areg+),fs5
| fmov (\areg+),fs6
| fmov (\areg+),fs7
| fmov (\areg+),fs8
| fmov (\areg+),fs9
| fmov (\areg+),fs10
| fmov (\areg+),fs11
| fmov (\areg+),fs12
| fmov (\areg+),fs13
| fmov (\areg+),fs14
| fmov (\areg+),fs15
| fmov (\areg+),fs16
| fmov (\areg+),fs17
| fmov (\areg+),fs18
| fmov (\areg+),fs19
| fmov (\areg+),fs20
| fmov (\areg+),fs21
| fmov (\areg+),fs22
| fmov (\areg+),fs23
| fmov (\areg+),fs24
| fmov (\areg+),fs25
| fmov (\areg+),fs26
| fmov (\areg+),fs27
| fmov (\areg+),fs28
| fmov (\areg+),fs29
| fmov (\areg+),fs30
| fmov (\areg+),fs31
| mov (\areg),\dreg
| fmov \dreg,fpcr
| .endm
|
| ###############################################################################
| #
| # void fpu_init_state(void)
| # - initialise the FPU
| #
| ###############################################################################
| .globl fpu_init_state
| .type fpu_init_state,@function
| fpu_init_state:
| mov epsw,d0
| or EPSW_FE,epsw
|
| #ifdef CONFIG_MN10300_PROC_MN103E010
| nop
| nop
| nop
| #endif
| FPU_INIT_STATE_ALL
| #ifdef CONFIG_MN10300_PROC_MN103E010
| nop
| nop
| nop
| #endif
| mov d0,epsw
| ret [],0
|
| .size fpu_init_state,.-fpu_init_state
|
| ###############################################################################
| #
| # void fpu_save(struct fpu_state_struct *)
| # - save the fpu state
| # - note that an FPU Operational exception might occur during this process
| #
| ###############################################################################
| .globl fpu_save
| .type fpu_save,@function
| fpu_save:
| mov epsw,d1
| or EPSW_FE,epsw /* enable the FPU so we can access it */
|
| #ifdef CONFIG_MN10300_PROC_MN103E010
| nop
| nop
| #endif
| mov d0,a0
| FPU_SAVE_ALL a0,d0
| #ifdef CONFIG_MN10300_PROC_MN103E010
| nop
| nop
| #endif
|
| mov d1,epsw
| ret [],0
|
| .size fpu_save,.-fpu_save
|
| ###############################################################################
| #
| # void fpu_disabled(void)
| # - handle an exception due to the FPU being disabled
| # when CONFIG_FPU is enabled
| #
| ###############################################################################
| .type fpu_disabled,@function
| .globl fpu_disabled
| fpu_disabled:
| or EPSW_nAR|EPSW_FE,epsw
| nop
| nop
| nop
|
| mov sp,a1
| mov (a1),d1 /* get epsw of user context */
| and ~(THREAD_SIZE-1),a1 /* a1: (thread_info *ti) */
| mov (TI_task,a1),a2 /* a2: (task_struct *tsk) */
| btst EPSW_nSL,d1
| beq fpu_used_in_kernel
|
| or EPSW_FE,d1
| mov d1,(sp)
| mov (TASK_THREAD+THREAD_FPU_FLAGS,a2),d1
| #ifndef CONFIG_LAZY_SAVE_FPU
| or __THREAD_HAS_FPU,d1
| mov d1,(TASK_THREAD+THREAD_FPU_FLAGS,a2)
| #else /* !CONFIG_LAZY_SAVE_FPU */
| mov (fpu_state_owner),a0
| cmp 0,a0
| beq fpu_regs_save_end
|
| mov (TASK_THREAD+THREAD_UREGS,a0),a1
| add TASK_THREAD+THREAD_FPU_STATE,a0
| FPU_SAVE_ALL a0,d0
|
| mov (REG_EPSW,a1),d0
| and ~EPSW_FE,d0
| mov d0,(REG_EPSW,a1)
|
| fpu_regs_save_end:
| mov a2,(fpu_state_owner)
| #endif /* !CONFIG_LAZY_SAVE_FPU */
|
| btst __THREAD_USING_FPU,d1
| beq fpu_regs_init
| add TASK_THREAD+THREAD_FPU_STATE,a2
| FPU_RESTORE_ALL a2,d0
| rti
|
| fpu_regs_init:
| FPU_INIT_STATE_ALL
| add TASK_THREAD+THREAD_FPU_FLAGS,a2
| bset __THREAD_USING_FPU,(0,a2)
| rti
|
| fpu_used_in_kernel:
| and ~(EPSW_nAR|EPSW_FE),epsw
| nop
| nop
|
| add -4,sp
| SAVE_ALL
| mov -1,d0
| mov d0,(REG_ORIG_D0,fp)
|
| and ~EPSW_NMID,epsw
|
| mov fp,d0
| call fpu_disabled_in_kernel[],0
| jmp ret_from_exception
|
| .size fpu_disabled,.-fpu_disabled
|
|
