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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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
/*
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* Copyright(c) 2015 EZchip Technologies.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*/
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#include <linux/sched.h>
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#include <asm/processor.h>
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#include <plat/ctop.h>
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void dp_save_restore(struct task_struct *prev, struct task_struct *next)
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{
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struct eznps_dp *prev_task_dp = &prev->thread.dp;
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struct eznps_dp *next_task_dp = &next->thread.dp;
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/* Here we save all Data Plane related auxiliary registers */
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prev_task_dp->eflags = read_aux_reg(CTOP_AUX_EFLAGS);
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write_aux_reg(CTOP_AUX_EFLAGS, next_task_dp->eflags);
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prev_task_dp->gpa1 = read_aux_reg(CTOP_AUX_GPA1);
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write_aux_reg(CTOP_AUX_GPA1, next_task_dp->gpa1);
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}
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