GuanXuetao | 56372b0 | 2011-01-15 18:17:56 +0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/unicore32/include/asm/mmu_context.h |
| 3 | * |
| 4 | * Code specific to PKUnity SoC and UniCore ISA |
| 5 | * |
| 6 | * Copyright (C) 2001-2010 GUAN Xue-tao |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | #ifndef __UNICORE_MMU_CONTEXT_H__ |
| 13 | #define __UNICORE_MMU_CONTEXT_H__ |
| 14 | |
| 15 | #include <linux/compiler.h> |
| 16 | #include <linux/sched.h> |
Davidlohr Bueso | 615d6e8 | 2014-04-07 15:37:25 -0700 | [diff] [blame] | 17 | #include <linux/mm.h> |
| 18 | #include <linux/vmacache.h> |
GuanXuetao | 56372b0 | 2011-01-15 18:17:56 +0800 | [diff] [blame] | 19 | #include <linux/io.h> |
| 20 | |
| 21 | #include <asm/cacheflush.h> |
| 22 | #include <asm/cpu-single.h> |
| 23 | |
| 24 | #define init_new_context(tsk, mm) 0 |
| 25 | |
| 26 | #define destroy_context(mm) do { } while (0) |
| 27 | |
| 28 | /* |
| 29 | * This is called when "tsk" is about to enter lazy TLB mode. |
| 30 | * |
| 31 | * mm: describes the currently active mm context |
| 32 | * tsk: task which is entering lazy tlb |
| 33 | * cpu: cpu number which is entering lazy tlb |
| 34 | * |
| 35 | * tsk->mm will be NULL |
| 36 | */ |
| 37 | static inline void |
| 38 | enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) |
| 39 | { |
| 40 | } |
| 41 | |
| 42 | /* |
| 43 | * This is the actual mm switch as far as the scheduler |
| 44 | * is concerned. No registers are touched. We avoid |
| 45 | * calling the CPU specific function when the mm hasn't |
| 46 | * actually changed. |
| 47 | */ |
| 48 | static inline void |
| 49 | switch_mm(struct mm_struct *prev, struct mm_struct *next, |
| 50 | struct task_struct *tsk) |
| 51 | { |
| 52 | unsigned int cpu = smp_processor_id(); |
| 53 | |
| 54 | if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next) |
| 55 | cpu_switch_mm(next->pgd, next); |
| 56 | } |
| 57 | |
| 58 | #define deactivate_mm(tsk, mm) do { } while (0) |
| 59 | #define activate_mm(prev, next) switch_mm(prev, next, NULL) |
| 60 | |
| 61 | /* |
| 62 | * We are inserting a "fake" vma for the user-accessible vector page so |
| 63 | * gdb and friends can get to it through ptrace and /proc/<pid>/mem. |
| 64 | * But we also want to remove it before the generic code gets to see it |
| 65 | * during process exit or the unmapping of it would cause total havoc. |
| 66 | * (the macro is used as remove_vma() is static to mm/mmap.c) |
| 67 | */ |
| 68 | #define arch_exit_mmap(mm) \ |
| 69 | do { \ |
| 70 | struct vm_area_struct *high_vma = find_vma(mm, 0xffff0000); \ |
| 71 | if (high_vma) { \ |
| 72 | BUG_ON(high_vma->vm_next); /* it should be last */ \ |
| 73 | if (high_vma->vm_prev) \ |
| 74 | high_vma->vm_prev->vm_next = NULL; \ |
| 75 | else \ |
| 76 | mm->mmap = NULL; \ |
| 77 | rb_erase(&high_vma->vm_rb, &mm->mm_rb); \ |
Davidlohr Bueso | 615d6e8 | 2014-04-07 15:37:25 -0700 | [diff] [blame] | 78 | vmacache_invalidate(mm); \ |
GuanXuetao | 56372b0 | 2011-01-15 18:17:56 +0800 | [diff] [blame] | 79 | mm->map_count--; \ |
| 80 | remove_vma(high_vma); \ |
| 81 | } \ |
| 82 | } while (0) |
| 83 | |
| 84 | static inline void arch_dup_mmap(struct mm_struct *oldmm, |
| 85 | struct mm_struct *mm) |
| 86 | { |
| 87 | } |
| 88 | |
Dave Hansen | 62e88b1 | 2014-11-18 10:23:50 -0800 | [diff] [blame] | 89 | static inline void arch_unmap(struct mm_struct *mm, |
| 90 | struct vm_area_struct *vma, |
| 91 | unsigned long start, unsigned long end) |
| 92 | { |
| 93 | } |
| 94 | |
| 95 | static inline void arch_bprm_mm_init(struct mm_struct *mm, |
| 96 | struct vm_area_struct *vma) |
| 97 | { |
| 98 | } |
| 99 | |
Dave Hansen | 1b2ee12 | 2016-02-12 13:02:21 -0800 | [diff] [blame^] | 100 | static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, |
| 101 | bool write, bool foreign) |
Dave Hansen | 33a709b | 2016-02-12 13:02:19 -0800 | [diff] [blame] | 102 | { |
| 103 | /* by default, allow everything */ |
| 104 | return true; |
| 105 | } |
| 106 | |
| 107 | static inline bool arch_pte_access_permitted(pte_t pte, bool write) |
| 108 | { |
| 109 | /* by default, allow everything */ |
| 110 | return true; |
| 111 | } |
GuanXuetao | 56372b0 | 2011-01-15 18:17:56 +0800 | [diff] [blame] | 112 | #endif |