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