| Richard Kuo | a7e7984 | 2011-10-31 18:53:38 -0500 | [diff] [blame] | 1 | /* |
| 2 | * MM context support for the Hexagon architecture |
| 3 | * |
| 4 | * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. |
| 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 |