2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #ifndef __UM_MMU_CONTEXT_H
7 #define __UM_MMU_CONTEXT_H
9 #include <asm-generic/mm_hooks.h>
11 #include "linux/sched.h"
12 #include "choose-mode.h"
15 #define get_mmu_context(task) do ; while(0)
16 #define activate_context(tsk) do ; while(0)
18 #define deactivate_mm(tsk,mm) do { } while (0)
20 extern void force_flush_all(void);
22 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
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
32 if (old != new && (current->flags & PF_BORROWED_MM))
33 CHOOSE_MODE(force_flush_all(),
34 switch_mm_skas(&new->context.skas.id));
37 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
38 struct task_struct *tsk)
40 unsigned cpu = smp_processor_id();
43 cpu_clear(cpu, prev->cpu_vm_mask);
44 cpu_set(cpu, next->cpu_vm_mask);
47 switch_mm_skas(&next->context.skas.id));
51 static inline void enter_lazy_tlb(struct mm_struct *mm,
52 struct task_struct *tsk)
56 extern int init_new_context_skas(struct task_struct *task,
57 struct mm_struct *mm);
59 static inline int init_new_context_tt(struct task_struct *task,
65 static inline int init_new_context(struct task_struct *task,
68 return(CHOOSE_MODE_PROC(init_new_context_tt, init_new_context_skas,
72 extern void destroy_context_skas(struct mm_struct *mm);
74 static inline void destroy_context(struct mm_struct *mm)
76 CHOOSE_MODE((void) 0, destroy_context_skas(mm));
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
86 * ---------------------------------------------------------------------------
88 * c-file-style: "linux"