arch/powerpc/include/asm/switch_to.h

Source file repositories/reference/linux-study-clean/arch/powerpc/include/asm/switch_to.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/switch_to.h
Extension
.h
Size
3230 bytes
Lines
134
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

static inline void save_fpu(struct task_struct *t) { }
static inline void flush_fp_to_thread(struct task_struct *t) { }
static inline void enable_kernel_fp(void)
{
	BUILD_BUG();
}
#endif

#ifdef CONFIG_ALTIVEC
extern void enable_kernel_altivec(void);
extern void flush_altivec_to_thread(struct task_struct *);
extern void giveup_altivec(struct task_struct *);
extern void save_altivec(struct task_struct *);
static inline void disable_kernel_altivec(void)
{
	msr_check_and_clear(MSR_VEC);
}
#else
static inline void save_altivec(struct task_struct *t) { }
static inline void __giveup_altivec(struct task_struct *t) { }
static inline void enable_kernel_altivec(void)
{
	BUILD_BUG();
}

static inline void disable_kernel_altivec(void)
{
	BUILD_BUG();
}
#endif

#ifdef CONFIG_VSX
extern void enable_kernel_vsx(void);
extern void flush_vsx_to_thread(struct task_struct *);
static inline void disable_kernel_vsx(void)
{
	msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
}
#else
static inline void enable_kernel_vsx(void)
{
	BUILD_BUG();
}

static inline void disable_kernel_vsx(void)
{
	BUILD_BUG();
}
#endif

#ifdef CONFIG_SPE
extern void enable_kernel_spe(void);
extern void flush_spe_to_thread(struct task_struct *);
extern void giveup_spe(struct task_struct *);
extern void __giveup_spe(struct task_struct *);
static inline void disable_kernel_spe(void)
{
	msr_check_and_clear(MSR_SPE);
}
#else
static inline void __giveup_spe(struct task_struct *t) { }
#endif

static inline void clear_task_ebb(struct task_struct *t)
{
#ifdef CONFIG_PPC_BOOK3S_64
    /* EBB perf events are not inherited, so clear all EBB state. */
    t->thread.ebbrr = 0;
    t->thread.ebbhr = 0;
    t->thread.bescr = 0;
    t->thread.mmcr2 = 0;
    t->thread.mmcr0 = 0;
    t->thread.siar = 0;
    t->thread.sdar = 0;
    t->thread.sier = 0;
    t->thread.used_ebb = 0;
#endif
}

void kvmppc_save_user_regs(void);
void kvmppc_save_current_sprs(void);

extern int set_thread_tidr(struct task_struct *t);

#endif /* _ASM_POWERPC_SWITCH_TO_H */

Annotation

Implementation Notes