/* * linux/arch/unicore32/include/asm/mmu_context.h * * Code specific to PKUnity SoC and UniCore ISA * * Copyright (C) 2001-2010 GUAN Xue-tao * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef __UNICORE_MMU_CONTEXT_H__ #define __UNICORE_MMU_CONTEXT_H__ #include <linux/compiler.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/vmacache.h> #include <linux/io.h> #include <asm/cacheflush.h> #include <asm/cpu-single.h> #define init_new_context(tsk, mm) 0 #define destroy_context(mm) do { } while (0) /* * This is called when "tsk" is about to enter lazy TLB mode. * * mm: describes the currently active mm context * tsk: task which is entering lazy tlb * cpu: cpu number which is entering lazy tlb * * tsk->mm will be NULL */ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) { } /* * This is the actual mm switch as far as the scheduler * is concerned. No registers are touched. We avoid * calling the CPU specific function when the mm hasn't * actually changed. */ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { unsigned int cpu = smp_processor_id(); if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next) cpu_switch_mm(next->pgd, next); } #define deactivate_mm(tsk, mm) do { } while (0) #define activate_mm(prev, next) switch_mm(prev, next, NULL) /* * We are inserting a "fake" vma for the user-accessible vector page so * gdb and friends can get to it through ptrace and /proc/<pid>/mem. * But we also want to remove it before the generic code gets to see it * during process exit or the unmapping of it would cause total havoc. * (the macro is used as remove_vma() is static to mm/mmap.c) */ #define arch_exit_mmap(mm) \ do { \ struct vm_area_struct *high_vma = find_vma(mm, 0xffff0000); \ if (high_vma) { \ BUG_ON(high_vma->vm_next); /* it should be last */ \ if (high_vma->vm_prev) \ high_vma->vm_prev->vm_next = NULL; \ else \ mm->mmap = NULL; \ rb_erase(&high_vma->vm_rb, &mm->mm_rb); \ vmacache_invalidate(mm); \ mm->map_count--; \ remove_vma(high_vma); \ } \ } while (0) static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) { } static inline void arch_unmap(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long start, unsigned long end) { } static inline void arch_bprm_mm_init(struct mm_struct *mm, struct vm_area_struct *vma) { } #endif