174 lines
5.2 KiB
C
174 lines
5.2 KiB
C
#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 */
|