mmu_context.h 5.0 KB
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#ifndef __ASM_POWERPC_MMU_CONTEXT_H
#define __ASM_POWERPC_MMU_CONTEXT_H
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#ifdef __KERNEL__
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#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
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#include <asm/mmu.h>	
#include <asm/cputable.h>
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#include <asm/cputhreads.h>
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/*
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 * Most if the context management is out of line
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 */
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extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
extern void destroy_context(struct mm_struct *mm);
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#ifdef CONFIG_SPAPR_TCE_IOMMU
struct mm_iommu_table_group_mem_t;

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extern int isolate_lru_page(struct page *page);	/* from internal.h */
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extern bool mm_iommu_preregistered(void);
extern long mm_iommu_get(unsigned long ua, unsigned long entries,
		struct mm_iommu_table_group_mem_t **pmem);
extern long mm_iommu_put(struct mm_iommu_table_group_mem_t *mem);
extern void mm_iommu_init(mm_context_t *ctx);
extern void mm_iommu_cleanup(mm_context_t *ctx);
extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(unsigned long ua,
		unsigned long size);
extern struct mm_iommu_table_group_mem_t *mm_iommu_find(unsigned long ua,
		unsigned long entries);
extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
		unsigned long ua, unsigned long *hpa);
extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
#endif
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extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
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extern void set_context(unsigned long id, pgd_t *pgd);
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#ifdef CONFIG_PPC_BOOK3S_64
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extern void radix__switch_mmu_context(struct mm_struct *prev,
				     struct mm_struct *next);
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static inline void switch_mmu_context(struct mm_struct *prev,
				      struct mm_struct *next,
				      struct task_struct *tsk)
{
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	if (radix_enabled())
		return radix__switch_mmu_context(prev, next);
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	return switch_slb(tsk, next);
}

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extern int __init_new_context(void);
extern void __destroy_context(int context_id);
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static inline void mmu_context_init(void) { }
#else
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extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
			       struct task_struct *tsk);
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extern unsigned long __init_new_context(void);
extern void __destroy_context(unsigned long context_id);
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extern void mmu_context_init(void);
#endif

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extern void switch_cop(struct mm_struct *next);
extern int use_cop(unsigned long acop, struct mm_struct *mm);
extern void drop_cop(unsigned long acop, struct mm_struct *mm);

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/*
 * switch_mm is the entry point called from the architecture independent
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 * code in kernel/sched/core.c
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 */
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
			     struct task_struct *tsk)
{
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	/* Mark this context has been used on the new CPU */
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	cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
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	/* 32-bit keeps track of the current PGDIR in the thread struct */
#ifdef CONFIG_PPC32
	tsk->thread.pgdir = next->pgd;
#endif /* CONFIG_PPC32 */
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	/* 64-bit Book3E keeps track of current PGD in the PACA */
#ifdef CONFIG_PPC_BOOK3E_64
	get_paca()->pgd = next->pgd;
#endif
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	/* Nothing else to do if we aren't actually switching */
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	if (prev == next)
		return;

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#ifdef CONFIG_PPC_ICSWX
	/* Switch coprocessor context only if prev or next uses a coprocessor */
	if (prev->context.acop || next->context.acop)
		switch_cop(next);
#endif /* CONFIG_PPC_ICSWX */

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	/* We must stop all altivec streams before changing the HW
	 * context
	 */
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#ifdef CONFIG_ALTIVEC
	if (cpu_has_feature(CPU_FTR_ALTIVEC))
		asm volatile ("dssall");
#endif /* CONFIG_ALTIVEC */
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	/*
	 * The actual HW switching method differs between the various
	 * sub architectures. Out of line for now
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	 */
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	switch_mmu_context(prev, next, tsk);
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}

#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);
}

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/* We don't currently use enter_lazy_tlb() for anything */
static inline void enter_lazy_tlb(struct mm_struct *mm,
				  struct task_struct *tsk)
{
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	/* 64-bit Book3E keeps track of current PGD in the PACA */
#ifdef CONFIG_PPC_BOOK3E_64
	get_paca()->pgd = NULL;
#endif
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}

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static inline void arch_dup_mmap(struct mm_struct *oldmm,
				 struct mm_struct *mm)
{
}

static inline void arch_exit_mmap(struct mm_struct *mm)
{
}

static inline void arch_unmap(struct mm_struct *mm,
			      struct vm_area_struct *vma,
			      unsigned long start, unsigned long end)
{
	if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
		mm->context.vdso_base = 0;
}

static inline void arch_bprm_mm_init(struct mm_struct *mm,
				     struct vm_area_struct *vma)
{
}

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static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
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		bool write, bool execute, bool foreign)
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{
	/* by default, allow everything */
	return true;
}

static inline bool arch_pte_access_permitted(pte_t pte, bool write)
{
	/* by default, allow everything */
	return true;
}
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#endif /* __KERNEL__ */
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#endif /* __ASM_POWERPC_MMU_CONTEXT_H */