projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| a7e79840 RK |
1 | /* |
| 2 | * MM context support for the Hexagon architecture | |
| 3 | * | |
| e1858b2a | 4 | * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. |
| a7e79840 RK |
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 and | |
| 8 | * only version 2 as published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License for more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU General Public License | |
| 16 | * along with this program; if not, write to the Free Software | |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
| 18 | * 02110-1301, USA. | |
| 19 | */ | |
| 20 | ||
| 21 | #ifndef _ASM_MMU_CONTEXT_H | |
| 22 | #define _ASM_MMU_CONTEXT_H | |
| 23 | ||
| 24 | #include <asm/setup.h> | |
| 25 | #include <asm/page.h> | |
| 26 | #include <asm/pgalloc.h> | |
| 27 | #include <asm/mem-layout.h> | |
| 28 | ||
| 29 | static inline void destroy_context(struct mm_struct *mm) | |
| 30 | { | |
| 31 | } | |
| 32 | ||
| 33 | /* | |
| 34 | * VM port hides all TLB management, so "lazy TLB" isn't very | |
| 35 | * meaningful. Even for ports to architectures with visble TLBs, | |
| 36 | * this is almost invariably a null function. | |
| 37 | */ | |
| 38 | static inline void enter_lazy_tlb(struct mm_struct *mm, | |
| 39 | struct task_struct *tsk) | |
| 40 | { | |
| 41 | } | |
| 42 | ||
| 43 | /* | |
| 44 | * Architecture-specific actions, if any, for memory map deactivation. | |
| 45 | */ | |
| 46 | static inline void deactivate_mm(struct task_struct *tsk, | |
| 47 | struct mm_struct *mm) | |
| 48 | { | |
| 49 | } | |
| 50 | ||
| 51 | /** | |
| 52 | * init_new_context - initialize context related info for new mm_struct instance | |
| 53 | * @tsk: pointer to a task struct | |
| 54 | * @mm: pointer to a new mm struct | |
| 55 | */ | |
| 56 | static inline int init_new_context(struct task_struct *tsk, | |
| 57 | struct mm_struct *mm) | |
| 58 | { | |
| 59 | /* mm->context is set up by pgd_alloc */ | |
| 60 | return 0; | |
| 61 | } | |
| 62 | ||
| 63 | /* | |
| 64 | * Switch active mm context | |
| 65 | */ | |
| 66 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
| 67 | struct task_struct *tsk) | |
| 68 | { | |
| 69 | int l1; | |
| 70 | ||
| 71 | /* | |
| 72 | * For virtual machine, we have to update system map if it's been | |
| 73 | * touched. | |
| 74 | */ | |
| 75 | if (next->context.generation < prev->context.generation) { | |
| 76 | for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++) | |
| 77 | next->pgd[l1] = init_mm.pgd[l1]; | |
| 78 | ||
| 79 | next->context.generation = prev->context.generation; | |
| 80 | } | |
| 81 | ||
| 82 | __vmnewmap((void *)next->context.ptbase); | |
| 83 | } | |
| 84 | ||
| 85 | /* | |
| 86 | * Activate new memory map for task | |
| 87 | */ | |
| 88 | static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) | |
| 89 | { | |
| 90 | unsigned long flags; | |
| 91 | ||
| 92 | local_irq_save(flags); | |
| 93 | switch_mm(prev, next, current_thread_info()->task); | |
| 94 | local_irq_restore(flags); | |
| 95 | } | |
| 96 | ||
| 97 | /* Generic hooks for arch_dup_mmap and arch_exit_mmap */ | |
| 98 | #include <asm-generic/mm_hooks.h> | |
| 99 | ||
| 100 | #endif |