LXR linux/arch/powerpc/include/asm/mmu

   1#ifndef __ASM_POWERPC_MMU_CONTEXT_H
   2#define __ASM_POWERPC_MMU_CONTEXT_H
   3#ifdef __KERNEL__
   4
   5#include <linux/kernel.h>
   6#include <linux/mm.h>
   7#include <linux/sched.h>
   8#include <linux/spinlock.h>
   9#include <asm/mmu.h>    
  10#include <asm/cputable.h>
  11#include <asm/cputhreads.h>
  12
  13/*
  14 * Most if the context management is out of line
  15 */
  16extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
  17extern void destroy_context(struct mm_struct *mm);
  18#ifdef CONFIG_SPAPR_TCE_IOMMU
  19struct mm_iommu_table_group_mem_t;
  20
  21extern bool mm_iommu_preregistered(void);
  22extern long mm_iommu_get(unsigned long ua, unsigned long entries,
  23                struct mm_iommu_table_group_mem_t **pmem);
  24extern long mm_iommu_put(struct mm_iommu_table_group_mem_t *mem);
  25extern void mm_iommu_init(mm_context_t *ctx);
  26extern void mm_iommu_cleanup(mm_context_t *ctx);
  27extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(unsigned long ua,
  28                unsigned long size);
  29extern struct mm_iommu_table_group_mem_t *mm_iommu_find(unsigned long ua,
  30                unsigned long entries);
  31extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
  32                unsigned long ua, unsigned long *hpa);
  33extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
  34extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
  35#endif
  36
  37extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next);
  38extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
  39extern void set_context(unsigned long id, pgd_t *pgd);
  40
  41#ifdef CONFIG_PPC_BOOK3S_64
  42extern int __init_new_context(void);
  43extern void __destroy_context(int context_id);
  44static inline void mmu_context_init(void) { }
  45#else
  46extern unsigned long __init_new_context(void);
  47extern void __destroy_context(unsigned long context_id);
  48extern void mmu_context_init(void);
  49#endif
  50
  51extern void switch_cop(struct mm_struct *next);
  52extern int use_cop(unsigned long acop, struct mm_struct *mm);
  53extern void drop_cop(unsigned long acop, struct mm_struct *mm);
  54
  55/*
  56 * switch_mm is the entry point called from the architecture independent
  57 * code in kernel/sched/core.c
  58 */
  59static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  60                             struct task_struct *tsk)
  61{
  62        /* Mark this context has been used on the new CPU */
  63        cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
  64
  65        /* 32-bit keeps track of the current PGDIR in the thread struct */
  66#ifdef CONFIG_PPC32
  67        tsk->thread.pgdir = next->pgd;
  68#endif /* CONFIG_PPC32 */
  69
  70        /* 64-bit Book3E keeps track of current PGD in the PACA */
  71#ifdef CONFIG_PPC_BOOK3E_64
  72        get_paca()->pgd = next->pgd;
  73#endif
  74        /* Nothing else to do if we aren't actually switching */
  75        if (prev == next)
  76                return;
  77
  78#ifdef CONFIG_PPC_ICSWX
  79        /* Switch coprocessor context only if prev or next uses a coprocessor */
  80        if (prev->context.acop || next->context.acop)
  81                switch_cop(next);
  82#endif /* CONFIG_PPC_ICSWX */
  83
  84        /* We must stop all altivec streams before changing the HW
  85         * context
  86         */
  87#ifdef CONFIG_ALTIVEC
  88        if (cpu_has_feature(CPU_FTR_ALTIVEC))
  89                asm volatile ("dssall");
  90#endif /* CONFIG_ALTIVEC */
  91
  92        /* The actual HW switching method differs between the various
  93         * sub architectures.
  94         */
  95#ifdef CONFIG_PPC_STD_MMU_64
  96        switch_slb(tsk, next);
  97#else
  98        /* Out of line for now */
  99        switch_mmu_context(prev, next);
 100#endif
 101
 102}
 103
 104#define deactivate_mm(tsk,mm)   do { } while (0)
 105
 106/*
 107 * After we have set current->mm to a new value, this activates
 108 * the context for the new mm so we see the new mappings.
 109 */
 110static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
 111{
 112        unsigned long flags;
 113
 114        local_irq_save(flags);
 115        switch_mm(prev, next, current);
 116        local_irq_restore(flags);
 117}
 118
 119/* We don't currently use enter_lazy_tlb() for anything */
 120static inline void enter_lazy_tlb(struct mm_struct *mm,
 121                                  struct task_struct *tsk)
 122{
 123        /* 64-bit Book3E keeps track of current PGD in the PACA */
 124#ifdef CONFIG_PPC_BOOK3E_64
 125        get_paca()->pgd = NULL;
 126#endif
 127}
 128
 129static inline void arch_dup_mmap(struct mm_struct *oldmm,
 130                                 struct mm_struct *mm)
 131{
 132}
 133
 134static inline void arch_exit_mmap(struct mm_struct *mm)
 135{
 136}
 137
 138static inline void arch_unmap(struct mm_struct *mm,
 139                              struct vm_area_struct *vma,
 140                              unsigned long start, unsigned long end)
 141{
 142        if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
 143                mm->context.vdso_base = 0;
 144}
 145
 146static inline void arch_bprm_mm_init(struct mm_struct *mm,
 147                                     struct vm_area_struct *vma)
 148{
 149}
 150
 151static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
 152                bool write, bool execute, bool foreign)
 153{
 154        /* by default, allow everything */
 155        return true;
 156}
 157
 158static inline bool arch_pte_access_permitted(pte_t pte, bool write)
 159{
 160        /* by default, allow everything */
 161        return true;
 162}
 163#endif /* __KERNEL__ */
 164#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
 165