| /* |
| * 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-internal.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_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_fpu_regs(); \ |
| save_access_regs(&prev->thread.acrs[0]); \ |
| save_ri_cb(prev->thread.ri_cb); \ |
| } \ |
| if (next->mm) { \ |
| update_cr_regs(next); \ |
| set_cpu_flag(CIF_FPU); \ |
| 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 */ |