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Linux Cross Reference
Linux/include/asm-arm/mmu_context.h

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~ 
  1 /*
  2  *  linux/include/asm-arm/mmu_context.h
  3  *
  4  *  Copyright (C) 1996 Russell King.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  *
 10  *  Changelog:
 11  *   27-06-1996 RMK     Created
 12  */
 13 #ifndef __ASM_ARM_MMU_CONTEXT_H
 14 #define __ASM_ARM_MMU_CONTEXT_H
 15 
 16 #include <asm/bitops.h>
 17 #include <asm/pgtable.h>
 18 #include <asm/arch/memory.h>
 19 #include <asm/proc-fns.h>
 20 
 21 #define destroy_context(mm)             do { } while(0)
 22 #define init_new_context(tsk,mm)        0
 23 
 24 /*
 25  * This is called when "tsk" is about to enter lazy TLB mode.
 26  *
 27  * mm:  describes the currently active mm context
 28  * tsk: task which is entering lazy tlb
 29  * cpu: cpu number which is entering lazy tlb
 30  *
 31  * tsk->mm will be NULL
 32  */
 33 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk, unsigned cpu)
 34 {
 35 }
 36 
 37 /*
 38  * This is the actual mm switch as far as the scheduler
 39  * is concerned.  No registers are touched.
 40  */
 41 static inline void
 42 switch_mm(struct mm_struct *prev, struct mm_struct *next,
 43           struct task_struct *tsk, unsigned int cpu)
 44 {
 45         if (prev != next) {
 46                 cpu_switch_mm(next->pgd, tsk);
 47                 clear_bit(cpu, &prev->cpu_vm_mask);
 48         }
 49         set_bit(cpu, &next->cpu_vm_mask);
 50 }
 51 
 52 #define activate_mm(prev, next) \
 53         switch_mm((prev),(next),NULL,smp_processor_id())
 54 
 55 #endif
 56
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