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[MIPS] FPU ownership management & preemption fixes

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Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto
2007-03-10 01:07:45 +09:00
committed by Ralf Baechle
parent c6a2f46793
commit 53dc80287d
10 changed files with 126 additions and 105 deletions
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56
include/asm-mips/fpu.h
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@@ -27,11 +27,11 @@
struct sigcontext;
struct sigcontext32;
extern asmlinkage int (*save_fp_context)(struct sigcontext *sc);
extern asmlinkage int (*restore_fp_context)(struct sigcontext *sc);
extern asmlinkage int (*save_fp_context)(struct sigcontext __user *sc);
extern asmlinkage int (*restore_fp_context)(struct sigcontext __user *sc);
extern asmlinkage int (*save_fp_context32)(struct sigcontext32 *sc);
extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 *sc);
extern asmlinkage int (*save_fp_context32)(struct sigcontext32 __user *sc);
extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 __user *sc);
extern void fpu_emulator_init_fpu(void);
extern void _init_fpu(void);
@@ -68,6 +68,8 @@ do { \
/* We don't care about the c0 hazard here */ \
} while (0)
#define __fpu_enabled() (read_c0_status() & ST0_CU1)
#define enable_fpu() \
do { \
if (cpu_has_fpu) \
@@ -93,31 +95,47 @@ static inline int is_fpu_owner(void)
return cpu_has_fpu && __is_fpu_owner();
}
static inline void own_fpu(void)
static inline void __own_fpu(void)
{
if (cpu_has_fpu) {
__enable_fpu();
KSTK_STATUS(current) |= ST0_CU1;
set_thread_flag(TIF_USEDFPU);
}
__enable_fpu();
KSTK_STATUS(current) |= ST0_CU1;
set_thread_flag(TIF_USEDFPU);
}
static inline void lose_fpu(void)
static inline void own_fpu(int restore)
{
if (cpu_has_fpu) {
preempt_disable();
if (cpu_has_fpu && !__is_fpu_owner()) {
__own_fpu();
if (restore)
_restore_fp(current);
}
preempt_enable();
}
static inline void lose_fpu(int save)
{
preempt_disable();
if (is_fpu_owner()) {
if (save)
_save_fp(current);
KSTK_STATUS(current) &= ~ST0_CU1;
clear_thread_flag(TIF_USEDFPU);
__disable_fpu();
}
preempt_enable();
}
static inline void init_fpu(void)
{
preempt_disable();
if (cpu_has_fpu) {
__own_fpu();
_init_fpu();
} else {
fpu_emulator_init_fpu();
}
preempt_enable();
}
static inline void save_fp(struct task_struct *tsk)
@@ -144,4 +162,18 @@ static inline fpureg_t *get_fpu_regs(struct task_struct *tsk)
return tsk->thread.fpu.fpr;
}
static inline void enable_fp_in_kernel(void)
{
set_thread_flag(TIF_ALLOW_FP_IN_KERNEL);
/* make sure CU1 and FPU ownership are consistent */
if (!__is_fpu_owner() && __fpu_enabled())
__disable_fpu();
}
static inline void disable_fp_in_kernel(void)
{
BUG_ON(!__is_fpu_owner() && __fpu_enabled());
clear_thread_flag(TIF_ALLOW_FP_IN_KERNEL);
}
#endif /* _ASM_FPU_H */