50 lines
1.4 KiB
C
Executable file
50 lines
1.4 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright IBM Corp. 1999, 2009
|
|
*
|
|
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
*/
|
|
|
|
#ifndef __ASM_SWITCH_TO_H
|
|
#define __ASM_SWITCH_TO_H
|
|
|
|
#include <linux/thread_info.h>
|
|
#include <asm/fpu/api.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/guarded_storage.h>
|
|
|
|
extern struct task_struct *__switch_to(void *, void *);
|
|
extern void update_cr_regs(struct task_struct *task);
|
|
|
|
static inline void save_access_regs(unsigned int *acrs)
|
|
{
|
|
typedef struct { int _[NUM_ACRS]; } acrstype;
|
|
|
|
asm volatile("stam 0,15,%0" : "=Q" (*(acrstype *)acrs));
|
|
}
|
|
|
|
static inline void restore_access_regs(unsigned int *acrs)
|
|
{
|
|
typedef struct { int _[NUM_ACRS]; } acrstype;
|
|
|
|
asm volatile("lam 0,15,%0" : : "Q" (*(acrstype *)acrs));
|
|
}
|
|
|
|
#define switch_to(prev, next, last) do { \
|
|
/* save_fpu_regs() sets the CIF_FPU flag, which enforces \
|
|
* a restore of the floating point / vector registers as \
|
|
* soon as the next task returns to user space \
|
|
*/ \
|
|
save_fpu_regs(); \
|
|
save_access_regs(&prev->thread.acrs[0]); \
|
|
save_ri_cb(prev->thread.ri_cb); \
|
|
save_gs_cb(prev->thread.gs_cb); \
|
|
update_cr_regs(next); \
|
|
restore_access_regs(&next->thread.acrs[0]); \
|
|
restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \
|
|
restore_gs_cb(next->thread.gs_cb); \
|
|
prev = __switch_to(prev, next); \
|
|
} while (0)
|
|
|
|
#endif /* __ASM_SWITCH_TO_H */
|