d0164ee20d
All calls to save_fpu_regs() specify the fpu structure of the current task pointer as parameter. The task pointer of the current task can also be retrieved from the CPU lowcore directly. Remove the parameter definition, load the __LC_CURRENT task pointer from the CPU lowcore, and rebase the FPU structure onto the task structure. Apply the same approach for the load_fpu_regs() function. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/*
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* Copyright IBM Corp. 1999, 2009
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#ifndef __ASM_SWITCH_TO_H
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#define __ASM_SWITCH_TO_H
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#include <linux/thread_info.h>
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#include <asm/fpu-internal.h>
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#include <asm/ptrace.h>
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extern struct task_struct *__switch_to(void *, void *);
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extern void update_cr_regs(struct task_struct *task);
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static inline void save_access_regs(unsigned int *acrs)
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{
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typedef struct { int _[NUM_ACRS]; } acrstype;
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asm volatile("stam 0,15,%0" : "=Q" (*(acrstype *)acrs));
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}
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static inline void restore_access_regs(unsigned int *acrs)
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{
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typedef struct { int _[NUM_ACRS]; } acrstype;
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asm volatile("lam 0,15,%0" : : "Q" (*(acrstype *)acrs));
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}
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#define switch_to(prev,next,last) do { \
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if (prev->mm) { \
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save_fpu_regs(); \
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save_access_regs(&prev->thread.acrs[0]); \
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save_ri_cb(prev->thread.ri_cb); \
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} \
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if (next->mm) { \
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update_cr_regs(next); \
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set_cpu_flag(CIF_FPU); \
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restore_access_regs(&next->thread.acrs[0]); \
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restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \
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} \
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prev = __switch_to(prev,next); \
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} while (0)
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#endif /* __ASM_SWITCH_TO_H */
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