linux-stable/include/asm-arm/fpstate.h
Catalin Marinas c642846489 [ARM] 4111/1: Allow VFP to work with thread migration on SMP
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>
2007-01-25 16:35:29 +00:00

88 lines
1.7 KiB
C

/*
* linux/include/asm-arm/fpstate.h
*
* Copyright (C) 1995 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_ARM_FPSTATE_H
#define __ASM_ARM_FPSTATE_H
#ifndef __ASSEMBLY__
/*
* VFP storage area has:
* - FPEXC, FPSCR, FPINST and FPINST2.
* - 16 double precision data registers
* - an implementation-dependant word of state for FLDMX/FSTMX
*
* FPEXC will always be non-zero once the VFP has been used in this process.
*/
struct vfp_hard_struct {
__u64 fpregs[16];
#if __LINUX_ARM_ARCH__ < 6
__u32 fpmx_state;
#endif
__u32 fpexc;
__u32 fpscr;
/*
* VFP implementation specific state
*/
__u32 fpinst;
__u32 fpinst2;
#ifdef CONFIG_SMP
__u32 cpu;
#endif
};
union vfp_state {
struct vfp_hard_struct hard;
};
extern void vfp_flush_thread(union vfp_state *);
extern void vfp_release_thread(union vfp_state *);
#define FP_HARD_SIZE 35
struct fp_hard_struct {
unsigned int save[FP_HARD_SIZE]; /* as yet undefined */
};
#define FP_SOFT_SIZE 35
struct fp_soft_struct {
unsigned int save[FP_SOFT_SIZE]; /* undefined information */
};
#define IWMMXT_SIZE 0x98
struct iwmmxt_struct {
unsigned int save[IWMMXT_SIZE / sizeof(unsigned int)];
};
union fp_state {
struct fp_hard_struct hard;
struct fp_soft_struct soft;
#ifdef CONFIG_IWMMXT
struct iwmmxt_struct iwmmxt;
#endif
};
#define FP_SIZE (sizeof(union fp_state) / sizeof(int))
struct crunch_state {
unsigned int mvdx[16][2];
unsigned int mvax[4][3];
unsigned int dspsc[2];
};
#define CRUNCH_SIZE sizeof(struct crunch_state)
#endif
#endif