mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
|
|
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#ifndef __UM_MMU_CONTEXT_H
|
|
#define __UM_MMU_CONTEXT_H
|
|
|
|
#include "linux/sched.h"
|
|
#include "choose-mode.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))
|
|
CHOOSE_MODE(force_flush_all(),
|
|
switch_mm_skas(&new->context.skas.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)
|
|
CHOOSE_MODE((void) 0,
|
|
switch_mm_skas(&next->context.skas.id));
|
|
}
|
|
}
|
|
|
|
static inline void enter_lazy_tlb(struct mm_struct *mm,
|
|
struct task_struct *tsk)
|
|
{
|
|
}
|
|
|
|
extern int init_new_context_skas(struct task_struct *task,
|
|
struct mm_struct *mm);
|
|
|
|
static inline int init_new_context_tt(struct task_struct *task,
|
|
struct mm_struct *mm)
|
|
{
|
|
return(0);
|
|
}
|
|
|
|
static inline int init_new_context(struct task_struct *task,
|
|
struct mm_struct *mm)
|
|
{
|
|
return(CHOOSE_MODE_PROC(init_new_context_tt, init_new_context_skas,
|
|
task, mm));
|
|
}
|
|
|
|
extern void destroy_context_skas(struct mm_struct *mm);
|
|
|
|
static inline void destroy_context(struct mm_struct *mm)
|
|
{
|
|
CHOOSE_MODE((void) 0, destroy_context_skas(mm));
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
|
* Emacs will notice this stuff at the end of the file and automatically
|
|
* adjust the settings for this buffer only. This must remain at the end
|
|
* of the file.
|
|
* ---------------------------------------------------------------------------
|
|
* Local variables:
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|