| #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/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); |
| #ifdef CONFIG_SPAPR_TCE_IOMMU |
| struct mm_iommu_table_group_mem_t; |
| |
| extern int isolate_lru_page(struct page *page); /* from internal.h */ |
| extern bool mm_iommu_preregistered(struct mm_struct *mm); |
| extern long mm_iommu_get(struct mm_struct *mm, |
| unsigned long ua, unsigned long entries, |
| struct mm_iommu_table_group_mem_t **pmem); |
| extern long mm_iommu_put(struct mm_struct *mm, |
| struct mm_iommu_table_group_mem_t *mem); |
| extern void mm_iommu_init(struct mm_struct *mm); |
| extern void mm_iommu_cleanup(struct mm_struct *mm); |
| extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm, |
| unsigned long ua, unsigned long size); |
| extern struct mm_iommu_table_group_mem_t *mm_iommu_find(struct mm_struct *mm, |
| 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 |
| 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 |
| extern void radix__switch_mmu_context(struct mm_struct *prev, |
| struct mm_struct *next); |
| static inline void switch_mmu_context(struct mm_struct *prev, |
| struct mm_struct *next, |
| struct task_struct *tsk) |
| { |
| if (radix_enabled()) |
| return radix__switch_mmu_context(prev, next); |
| return switch_slb(tsk, next); |
| } |
| |
| extern int __init_new_context(void); |
| extern void __destroy_context(int context_id); |
| static inline void mmu_context_init(void) { } |
| #else |
| extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, |
| struct task_struct *tsk); |
| extern unsigned long __init_new_context(void); |
| extern void __destroy_context(unsigned long context_id); |
| extern void mmu_context_init(void); |
| #endif |
| |
| 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); |
| |
| /* |
| * switch_mm is the entry point called from the architecture independent |
| * code in kernel/sched/core.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 */ |
| if (!cpumask_test_cpu(smp_processor_id(), mm_cpumask(next))) |
| 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 */ |
| |
| /* 64-bit Book3E keeps track of current PGD in the PACA */ |
| #ifdef CONFIG_PPC_BOOK3E_64 |
| get_paca()->pgd = next->pgd; |
| #endif |
| /* Nothing else to do if we aren't actually switching */ |
| if (prev == next) |
| return; |
| |
| #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 */ |
| |
| /* 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. Out of line for now |
| */ |
| switch_mmu_context(prev, next, tsk); |
| } |
| |
| #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) |
| { |
| /* 64-bit Book3E keeps track of current PGD in the PACA */ |
| #ifdef CONFIG_PPC_BOOK3E_64 |
| get_paca()->pgd = NULL; |
| #endif |
| } |
| |
| 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) |
| { |
| } |
| |
| static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, |
| bool write, bool execute, bool foreign) |
| { |
| /* by default, allow everything */ |
| return true; |
| } |
| |
| static inline bool arch_pte_access_permitted(pte_t pte, bool write) |
| { |
| /* by default, allow everything */ |
| return true; |
| } |
| #endif /* __KERNEL__ */ |
| #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |