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/*
* 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/ptrace.h>
extern struct task_struct *__switch_to(void *, void *);
extern void update_cr_regs(struct task_struct *task);
static inline void save_fp_regs(s390_fp_regs *fpregs)
{
asm volatile(
" std 0,%O0+8(%R0)\n"
" std 2,%O0+24(%R0)\n"
" std 4,%O0+40(%R0)\n"
" std 6,%O0+56(%R0)"
: "=Q" (*fpregs) : "Q" (*fpregs));
if (!MACHINE_HAS_IEEE)
return;
asm volatile(
" stfpc %0\n"
" std 1,%O0+16(%R0)\n"
" std 3,%O0+32(%R0)\n"
" std 5,%O0+48(%R0)\n"
" std 7,%O0+64(%R0)\n"
" std 8,%O0+72(%R0)\n"
" std 9,%O0+80(%R0)\n"
" std 10,%O0+88(%R0)\n"
" std 11,%O0+96(%R0)\n"
" std 12,%O0+104(%R0)\n"
" std 13,%O0+112(%R0)\n"
" std 14,%O0+120(%R0)\n"
" std 15,%O0+128(%R0)\n"
: "=Q" (*fpregs) : "Q" (*fpregs));
}
static inline void restore_fp_regs(s390_fp_regs *fpregs)
{
asm volatile(
" ld 0,%O0+8(%R0)\n"
" ld 2,%O0+24(%R0)\n"
" ld 4,%O0+40(%R0)\n"
" ld 6,%O0+56(%R0)"
: : "Q" (*fpregs));
if (!MACHINE_HAS_IEEE)
return;
asm volatile(
" lfpc %0\n"
" ld 1,%O0+16(%R0)\n"
" ld 3,%O0+32(%R0)\n"
" ld 5,%O0+48(%R0)\n"
" ld 7,%O0+64(%R0)\n"
" ld 8,%O0+72(%R0)\n"
" ld 9,%O0+80(%R0)\n"
" ld 10,%O0+88(%R0)\n"
" ld 11,%O0+96(%R0)\n"
" ld 12,%O0+104(%R0)\n"
" ld 13,%O0+112(%R0)\n"
" ld 14,%O0+120(%R0)\n"
" ld 15,%O0+128(%R0)\n"
: : "Q" (*fpregs));
}
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 { \
if (prev->mm) { \
save_fp_regs(&prev->thread.fp_regs); \
save_access_regs(&prev->thread.acrs[0]); \
save_ri_cb(prev->thread.ri_cb); \
} \
if (next->mm) { \
restore_fp_regs(&next->thread.fp_regs); \
restore_access_regs(&next->thread.acrs[0]); \
restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \
update_cr_regs(next); \
} \
prev = __switch_to(prev,next); \
} while (0)
#define finish_arch_switch(prev) do { \
set_fs(current->thread.mm_segment); \
} while (0)
#endif /* __ASM_SWITCH_TO_H */
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