1/* 2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) 3 * Licensed under the GPL 4 */ 5 6#ifndef __UM_MMU_CONTEXT_H 7#define __UM_MMU_CONTEXT_H 8 9#include <asm-generic/mm_hooks.h> 10 11#include "linux/sched.h" 12#include "choose-mode.h" 13#include "um_mmu.h" 14 15#define get_mmu_context(task) do ; while(0) 16#define activate_context(tsk) do ; while(0) 17 18#define deactivate_mm(tsk,mm) do { } while (0) 19 20extern void force_flush_all(void); 21 22static inline void activate_mm(struct mm_struct *old, struct mm_struct *new) 23{ 24 /* 25 * This is called by fs/exec.c and fs/aio.c. In the first case, for an 26 * exec, we don't need to do anything as we're called from userspace 27 * and thus going to use a new host PID. In the second, we're called 28 * from a kernel thread, and thus need to go doing the mmap's on the 29 * host. Since they're very expensive, we want to avoid that as far as 30 * possible. 31 */ 32 if (old != new && (current->flags & PF_BORROWED_MM)) 33 CHOOSE_MODE(force_flush_all(), 34 switch_mm_skas(&new->context.skas.id)); 35} 36 37static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 38 struct task_struct *tsk) 39{ 40 unsigned cpu = smp_processor_id(); 41 42 if(prev != next){ 43 cpu_clear(cpu, prev->cpu_vm_mask); 44 cpu_set(cpu, next->cpu_vm_mask); 45 if(next != &init_mm) 46 CHOOSE_MODE((void) 0, 47 switch_mm_skas(&next->context.skas.id)); 48 } 49} 50 51static inline void enter_lazy_tlb(struct mm_struct *mm, 52 struct task_struct *tsk) 53{ 54} 55 56extern int init_new_context_skas(struct task_struct *task, 57 struct mm_struct *mm); 58 59static inline int init_new_context_tt(struct task_struct *task, 60 struct mm_struct *mm) 61{ 62 return(0); 63} 64 65static inline int init_new_context(struct task_struct *task, 66 struct mm_struct *mm) 67{ 68 return(CHOOSE_MODE_PROC(init_new_context_tt, init_new_context_skas, 69 task, mm)); 70} 71 72extern void destroy_context_skas(struct mm_struct *mm); 73 74static inline void destroy_context(struct mm_struct *mm) 75{ 76 CHOOSE_MODE((void) 0, destroy_context_skas(mm)); 77} 78 79#endif 80 81/* 82 * Overrides for Emacs so that we follow Linus's tabbing style. 83 * Emacs will notice this stuff at the end of the file and automatically 84 * adjust the settings for this buffer only. This must remain at the end 85 * of the file. 86 * --------------------------------------------------------------------------- 87 * Local variables: 88 * c-file-style: "linux" 89 * End: 90 */ 91