[linux-2.6-block.git] / arch / powerpc / include / asm / mmu_context.h

#ifndef __ASM_POWERPC_MMU_CONTEXT_H
#define __ASM_POWERPC_MMU_CONTEXT_H
#ifdef __KERNEL__

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <asm/mmu.h>	
#include <asm/cputable.h>
#include <asm-generic/mm_hooks.h>
#include <asm/cputhreads.h>

/*
 * Most if the context management is out of line
 */
extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
extern void destroy_context(struct mm_struct *mm);

extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next);
extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
extern void set_context(unsigned long id, pgd_t *pgd);

#ifdef CONFIG_PPC_BOOK3S_64
static inline void mmu_context_init(void) { }
#else
extern void mmu_context_init(void);
#endif

/*
 * switch_mm is the entry point called from the architecture independent
 * code in kernel/sched.c
 */
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
			     struct task_struct *tsk)
{
	/* Mark this context has been used on the new CPU */
	cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));

	/* 32-bit keeps track of the current PGDIR in the thread struct */
#ifdef CONFIG_PPC32
	tsk->thread.pgdir = next->pgd;
#endif /* CONFIG_PPC32 */

	/* Nothing else to do if we aren't actually switching */
	if (prev == next)
		return;

	/* We must stop all altivec streams before changing the HW
	 * context
	 */
#ifdef CONFIG_ALTIVEC
	if (cpu_has_feature(CPU_FTR_ALTIVEC))
		asm volatile ("dssall");
#endif /* CONFIG_ALTIVEC */

	/* The actual HW switching method differs between the various
	 * sub architectures.
	 */
#ifdef CONFIG_PPC_STD_MMU_64
	if (cpu_has_feature(CPU_FTR_SLB))
		switch_slb(tsk, next);
	else
		switch_stab(tsk, next);
#else
	/* Out of line for now */
	switch_mmu_context(prev, next);
#endif

}

#define deactivate_mm(tsk,mm)	do { } while (0)

/*
 * After we have set current->mm to a new value, this activates
 * the context for the new mm so we see the new mappings.
 */
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
	unsigned long flags;

	local_irq_save(flags);
	switch_mm(prev, next, current);
	local_irq_restore(flags);
}

/* We don't currently use enter_lazy_tlb() for anything */
static inline void enter_lazy_tlb(struct mm_struct *mm,
				  struct task_struct *tsk)
{
}

#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
Commit	Line	Data
047ea784 PM	1	#ifndef __ASM_POWERPC_MMU_CONTEXT_H
047ea784 PM	2	#define __ASM_POWERPC_MMU_CONTEXT_H
88ced031	3	#ifdef __KERNEL__
047ea784	4
5e696617 BH	5	#include <linux/kernel.h>
	6	#include <linux/mm.h>
	7	#include <linux/sched.h>
	8	#include <linux/spinlock.h>
80a7cc6c KG	9	#include <asm/mmu.h>
	10	#include <asm/cputable.h>
	11	#include <asm-generic/mm_hooks.h>
5e696617	12	#include <asm/cputhreads.h>
80a7cc6c KG	13
80a7cc6c KG	14	/*
5e696617	15	* Most if the context management is out of line
80a7cc6c	16	*/
1da177e4 LT	17	extern int init_new_context(struct task_struct tsk, struct mm_struct mm);
	18	extern void destroy_context(struct mm_struct *mm);
	19
5e696617	20	extern void switch_mmu_context(struct mm_struct prev, struct mm_struct next);
1da177e4 LT	21	extern void switch_stab(struct task_struct tsk, struct mm_struct mm);
1da177e4 LT	22	extern void switch_slb(struct task_struct tsk, struct mm_struct mm);
5e696617	23	extern void set_context(unsigned long id, pgd_t *pgd);
1da177e4	24
6f0ef0f5 BH	25	#ifdef CONFIG_PPC_BOOK3S_64
	26	static inline void mmu_context_init(void) { }
	27	#else
	28	extern void mmu_context_init(void);
	29	#endif
	30
1da177e4 LT	31	/*
	32	* switch_mm is the entry point called from the architecture independent
	33	* code in kernel/sched.c
	34	*/
	35	static inline void switch_mm(struct mm_struct prev, struct mm_struct next,
	36	struct task_struct *tsk)
	37	{
5e696617	38	/* Mark this context has been used on the new CPU */
56aa4129	39	cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
5e696617 BH	40
	41	/* 32-bit keeps track of the current PGDIR in the thread struct */
	42	#ifdef CONFIG_PPC32
	43	tsk->thread.pgdir = next->pgd;
	44	#endif /* CONFIG_PPC32 */
1da177e4	45
5e696617	46	/* Nothing else to do if we aren't actually switching */
1da177e4 LT	47	if (prev == next)
	48	return;
	49
5e696617 BH	50	/* We must stop all altivec streams before changing the HW
	51	* context
	52	*/
1da177e4 LT	53	#ifdef CONFIG_ALTIVEC
	54	if (cpu_has_feature(CPU_FTR_ALTIVEC))
	55	asm volatile ("dssall");
	56	#endif /* CONFIG_ALTIVEC */
	57
5e696617 BH	58	/* The actual HW switching method differs between the various
	59	* sub architectures.
	60	*/
	61	#ifdef CONFIG_PPC_STD_MMU_64
1da177e4 LT	62	if (cpu_has_feature(CPU_FTR_SLB))
	63	switch_slb(tsk, next);
	64	else
	65	switch_stab(tsk, next);
5e696617 BH	66	#else
	67	/* Out of line for now */
	68	switch_mmu_context(prev, next);
	69	#endif
	70
1da177e4 LT	71	}
	72
	73	#define deactivate_mm(tsk,mm) do { } while (0)
	74
	75	/*
	76	* After we have set current->mm to a new value, this activates
	77	* the context for the new mm so we see the new mappings.
	78	*/
	79	static inline void activate_mm(struct mm_struct prev, struct mm_struct next)
	80	{
	81	unsigned long flags;
	82
	83	local_irq_save(flags);
	84	switch_mm(prev, next, current);
	85	local_irq_restore(flags);
	86	}
	87
5e696617 BH	88	/* We don't currently use enter_lazy_tlb() for anything */
	89	static inline void enter_lazy_tlb(struct mm_struct *mm,
	90	struct task_struct *tsk)
	91	{
	92	}
	93
88ced031	94	#endif /* __KERNEL__ */
047ea784	95	#endif /* __ASM_POWERPC_MMU_CONTEXT_H */