mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
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
/*
|
|
* 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
|