c642846489
The current lazy saving of the VFP registers is no longer possible with thread migration on SMP. This patch implements a per-CPU vfp-state pointer and the saving of the VFP registers at every context switch. The registers restoring is still performed in a lazy way. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
88 lines
1.7 KiB
C
88 lines
1.7 KiB
C
/*
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* linux/include/asm-arm/fpstate.h
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*
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* Copyright (C) 1995 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_FPSTATE_H
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#define __ASM_ARM_FPSTATE_H
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#ifndef __ASSEMBLY__
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/*
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* VFP storage area has:
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* - FPEXC, FPSCR, FPINST and FPINST2.
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* - 16 double precision data registers
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* - an implementation-dependant word of state for FLDMX/FSTMX
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*
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* FPEXC will always be non-zero once the VFP has been used in this process.
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*/
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struct vfp_hard_struct {
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__u64 fpregs[16];
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#if __LINUX_ARM_ARCH__ < 6
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__u32 fpmx_state;
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#endif
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__u32 fpexc;
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__u32 fpscr;
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/*
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* VFP implementation specific state
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*/
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__u32 fpinst;
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__u32 fpinst2;
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#ifdef CONFIG_SMP
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__u32 cpu;
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#endif
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};
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union vfp_state {
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struct vfp_hard_struct hard;
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};
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extern void vfp_flush_thread(union vfp_state *);
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extern void vfp_release_thread(union vfp_state *);
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#define FP_HARD_SIZE 35
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struct fp_hard_struct {
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unsigned int save[FP_HARD_SIZE]; /* as yet undefined */
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};
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#define FP_SOFT_SIZE 35
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struct fp_soft_struct {
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unsigned int save[FP_SOFT_SIZE]; /* undefined information */
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};
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#define IWMMXT_SIZE 0x98
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struct iwmmxt_struct {
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unsigned int save[IWMMXT_SIZE / sizeof(unsigned int)];
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};
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union fp_state {
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struct fp_hard_struct hard;
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struct fp_soft_struct soft;
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#ifdef CONFIG_IWMMXT
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struct iwmmxt_struct iwmmxt;
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#endif
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};
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#define FP_SIZE (sizeof(union fp_state) / sizeof(int))
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struct crunch_state {
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unsigned int mvdx[16][2];
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unsigned int mvax[4][3];
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unsigned int dspsc[2];
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};
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#define CRUNCH_SIZE sizeof(struct crunch_state)
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#endif
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#endif
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