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 <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 */