mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 16:35:34 +07:00
5b2189ab6e
save EFLAGS, and GPA1 auxiliary registers during context switch, since they may be changed by the new task in kernel mode, while using atomic ops e.g. cmpxchg. Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
33 lines
1.1 KiB
C
33 lines
1.1 KiB
C
/*
|
|
* Copyright(c) 2015 EZchip Technologies.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* The full GNU General Public License is included in this distribution in
|
|
* the file called "COPYING".
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <asm/processor.h>
|
|
#include <plat/ctop.h>
|
|
|
|
void dp_save_restore(struct task_struct *prev, struct task_struct *next)
|
|
{
|
|
struct eznps_dp *prev_task_dp = &prev->thread.dp;
|
|
struct eznps_dp *next_task_dp = &next->thread.dp;
|
|
|
|
/* Here we save all Data Plane related auxiliary registers */
|
|
prev_task_dp->eflags = read_aux_reg(CTOP_AUX_EFLAGS);
|
|
write_aux_reg(CTOP_AUX_EFLAGS, next_task_dp->eflags);
|
|
|
|
prev_task_dp->gpa1 = read_aux_reg(CTOP_AUX_GPA1);
|
|
write_aux_reg(CTOP_AUX_GPA1, next_task_dp->gpa1);
|
|
}
|