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csky: Process management and Signal

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This patch adds files related to task_switch, sigcontext, signal,
fpu context switch.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Guo Ren
2018-09-05 14:25:14 +08:00
parent 013de2d667
commit e9564df753
10 changed files with 1231 additions and 0 deletions
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36
arch/csky/include/asm/switch_to.h Normal file
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@@ -0,0 +1,36 @@
/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#ifndef __ASM_CSKY_SWITCH_TO_H
#define __ASM_CSKY_SWITCH_TO_H
#include <linux/thread_info.h>
#ifdef CONFIG_CPU_HAS_FPU
#include <abi/fpu.h>
static inline void __switch_to_fpu(struct task_struct *prev,
struct task_struct *next)
{
save_to_user_fp(&prev->thread.user_fp);
restore_from_user_fp(&next->thread.user_fp);
}
#else
static inline void __switch_to_fpu(struct task_struct *prev,
struct task_struct *next)
{}
#endif
/*
* Context switching is now performed out-of-line in switch_to.S
*/
extern struct task_struct *__switch_to(struct task_struct *,
struct task_struct *);
#define switch_to(prev, next, last) \
do { \
struct task_struct *__prev = (prev); \
struct task_struct *__next = (next); \
__switch_to_fpu(__prev, __next); \
((last) = __switch_to((prev), (next))); \
} while (0)
#endif /* __ASM_CSKY_SWITCH_TO_H */