1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * MM context support for the Hexagon architecture
4 *
5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
6 */
7
8 #ifndef _ASM_MMU_CONTEXT_H
9 #define _ASM_MMU_CONTEXT_H
10
11 #include <linux/mm_types.h>
12
13 #include <asm/setup.h>
14 #include <asm/page.h>
15 #include <asm/pgalloc.h>
16 #include <asm/mem-layout.h>
17
destroy_context(struct mm_struct * mm)18 static inline void destroy_context(struct mm_struct *mm)
19 {
20 }
21
22 /*
23 * VM port hides all TLB management, so "lazy TLB" isn't very
24 * meaningful. Even for ports to architectures with visble TLBs,
25 * this is almost invariably a null function.
26 */
enter_lazy_tlb(struct mm_struct * mm,struct task_struct * tsk)27 static inline void enter_lazy_tlb(struct mm_struct *mm,
28 struct task_struct *tsk)
29 {
30 }
31
32 /*
33 * Architecture-specific actions, if any, for memory map deactivation.
34 */
deactivate_mm(struct task_struct * tsk,struct mm_struct * mm)35 static inline void deactivate_mm(struct task_struct *tsk,
36 struct mm_struct *mm)
37 {
38 }
39
40 /**
41 * init_new_context - initialize context related info for new mm_struct instance
42 * @tsk: pointer to a task struct
43 * @mm: pointer to a new mm struct
44 */
init_new_context(struct task_struct * tsk,struct mm_struct * mm)45 static inline int init_new_context(struct task_struct *tsk,
46 struct mm_struct *mm)
47 {
48 /* mm->context is set up by pgd_alloc */
49 return 0;
50 }
51
52 /*
53 * Switch active mm context
54 */
switch_mm(struct mm_struct * prev,struct mm_struct * next,struct task_struct * tsk)55 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
56 struct task_struct *tsk)
57 {
58 int l1;
59
60 /*
61 * For virtual machine, we have to update system map if it's been
62 * touched.
63 */
64 if (next->context.generation < prev->context.generation) {
65 for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++)
66 next->pgd[l1] = init_mm.pgd[l1];
67
68 next->context.generation = prev->context.generation;
69 }
70
71 __vmnewmap((void *)next->context.ptbase);
72 }
73
74 /*
75 * Activate new memory map for task
76 */
activate_mm(struct mm_struct * prev,struct mm_struct * next)77 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
78 {
79 unsigned long flags;
80
81 local_irq_save(flags);
82 switch_mm(prev, next, current_thread_info()->task);
83 local_irq_restore(flags);
84 }
85
86 /* Generic hooks for arch_dup_mmap and arch_exit_mmap */
87 #include <asm-generic/mm_hooks.h>
88
89 #endif
90