/* * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Licensed under the GPL */ #ifndef __UM_MMU_CONTEXT_H #define __UM_MMU_CONTEXT_H #include <asm-generic/mm_hooks.h> #include "linux/sched.h" #include "um_mmu.h" #define get_mmu_context(task) do ; while(0) #define activate_context(tsk) do ; while(0) #define deactivate_mm(tsk,mm) do { } while (0) extern void force_flush_all(void); static inline void activate_mm(struct mm_struct *old, struct mm_struct *new) { /* * This is called by fs/exec.c and fs/aio.c. In the first case, for an * exec, we don't need to do anything as we're called from userspace * and thus going to use a new host PID. In the second, we're called * from a kernel thread, and thus need to go doing the mmap's on the * host. Since they're very expensive, we want to avoid that as far as * possible. */ if (old != new && (current->flags & PF_BORROWED_MM)) __switch_mm(&new->context.id); } static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { unsigned cpu = smp_processor_id(); if(prev != next){ cpu_clear(cpu, prev->cpu_vm_mask); cpu_set(cpu, next->cpu_vm_mask); if(next != &init_mm) __switch_mm(&next->context.id); } } static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) { } extern int init_new_context(struct task_struct *task, struct mm_struct *mm); extern void destroy_context(struct mm_struct *mm); #endif