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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 int test_fp_ctl(u32 fpc)
{
u32 orig_fpc;
int rc;
if (!MACHINE_HAS_IEEE)
return 0;
asm volatile(
" efpc %1\n"
" sfpc %2\n"
"0: sfpc %1\n"
" la %0,0\n"
"1:\n"
EX_TABLE(0b,1b)
: "=d" (rc), "=d" (orig_fpc)
: "d" (fpc), "0" (-EINVAL));
return rc;
}
static inline void save_fp_ctl(u32 *fpc)
{
if (!MACHINE_HAS_IEEE)
return;
asm volatile(
" stfpc %0\n"
: "+Q" (*fpc));
}
static inline int restore_fp_ctl(u32 *fpc)
{
int rc;
if (!MACHINE_HAS_IEEE)
return 0;
asm volatile(
" lfpc %1\n"
"0: la %0,0\n"
"1:\n"
EX_TABLE(0b,1b)
: "=d" (rc) : "Q" (*fpc), "0" (-EINVAL));
return rc;
}
static inline void save_fp_regs(freg_t *fprs)
{
asm volatile("std 0,%0" : "=Q" (fprs[0]));
asm volatile("std 2,%0" : "=Q" (fprs[2]));
asm volatile("std 4,%0" : "=Q" (fprs[4]));
asm volatile("std 6,%0" : "=Q" (fprs[6]));
if (!MACHINE_HAS_IEEE)
return;
asm volatile("std 1,%0" : "=Q" (fprs[1]));
asm volatile("std 3,%0" : "=Q" (fprs[3]));
asm volatile("std 5,%0" : "=Q" (fprs[5]));
asm volatile("std 7,%0" : "=Q" (fprs[7]));
asm volatile("std 8,%0" : "=Q" (fprs[8]));
asm volatile("std 9,%0" : "=Q" (fprs[9]));
asm volatile("std 10,%0" : "=Q" (fprs[10]));
asm volatile("std 11,%0" : "=Q" (fprs[11]));
asm volatile("std 12,%0" : "=Q" (fprs[12]));
asm volatile("std 13,%0" : "=Q" (fprs[13]));
asm volatile("std 14,%0" : "=Q" (fprs[14]));
asm volatile("std 15,%0" : "=Q" (fprs[15]));
}
static inline void restore_fp_regs(freg_t *fprs)
{
asm volatile("ld 0,%0" : : "Q" (fprs[0]));
asm volatile("ld 2,%0" : : "Q" (fprs[2]));
asm volatile("ld 4,%0" : : "Q" (fprs[4]));
asm volatile("ld 6,%0" : : "Q" (fprs[6]));
if (!MACHINE_HAS_IEEE)
return;
asm volatile("ld 1,%0" : : "Q" (fprs[1]));
asm volatile("ld 3,%0" : : "Q" (fprs[3]));
asm volatile("ld 5,%0" : : "Q" (fprs[5]));
asm volatile("ld 7,%0" : : "Q" (fprs[7]));
asm volatile("ld 8,%0" : : "Q" (fprs[8]));
asm volatile("ld 9,%0" : : "Q" (fprs[9]));
asm volatile("ld 10,%0" : : "Q" (fprs[10]));
asm volatile("ld 11,%0" : : "Q" (fprs[11]));
asm volatile("ld 12,%0" : : "Q" (fprs[12]));
asm volatile("ld 13,%0" : : "Q" (fprs[13]));
asm volatile("ld 14,%0" : : "Q" (fprs[14]));
asm volatile("ld 15,%0" : : "Q" (fprs[15]));
}
static inline void save_vx_regs(__vector128 *vxrs)
{
typedef struct { __vector128 _[__NUM_VXRS]; } addrtype;
asm volatile(
" la 1,%0\n"
" .word 0xe70f,0x1000,0x003e\n" /* vstm 0,15,0(1) */
" .word 0xe70f,0x1100,0x0c3e\n" /* vstm 16,31,256(1) */
: "=Q" (*(addrtype *) vxrs) : : "1");
}
static inline void save_vx_regs_safe(__vector128 *vxrs)
{
unsigned long cr0, flags;
flags = arch_local_irq_save();
__ctl_store(cr0, 0, 0);
__ctl_set_bit(0, 17);
__ctl_set_bit(0, 18);
save_vx_regs(vxrs);
__ctl_load(cr0, 0, 0);
arch_local_irq_restore(flags);
}
static inline void restore_vx_regs(__vector128 *vxrs)
{
typedef struct { __vector128 _[__NUM_VXRS]; } addrtype;
asm volatile(
" la 1,%0\n"
" .word 0xe70f,0x1000,0x0036\n" /* vlm 0,15,0(1) */
" .word 0xe70f,0x1100,0x0c36\n" /* vlm 16,31,256(1) */
: : "Q" (*(addrtype *) vxrs) : "1");
}
static inline void save_fp_vx_regs(struct task_struct *task)
{
#ifdef CONFIG_64BIT
if (task->thread.vxrs)
save_vx_regs(task->thread.vxrs);
else
#endif
save_fp_regs(task->thread.fp_regs.fprs);
}
static inline void restore_fp_vx_regs(struct task_struct *task)
{
#ifdef CONFIG_64BIT
if (task->thread.vxrs)
restore_vx_regs(task->thread.vxrs);
else
#endif
restore_fp_regs(task->thread.fp_regs.fprs);
}
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_ctl(&prev->thread.fp_regs.fpc); \
save_fp_vx_regs(prev); \
save_access_regs(&prev->thread.acrs[0]); \
save_ri_cb(prev->thread.ri_cb); \
} \
if (next->mm) { \
update_cr_regs(next); \
restore_fp_ctl(&next->thread.fp_regs.fpc); \
restore_fp_vx_regs(next); \
restore_access_regs(&next->thread.acrs[0]); \
restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \
} \
prev = __switch_to(prev,next); \
} while (0)
#endif /* __ASM_SWITCH_TO_H */
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