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3f65ce4d | 1 | /* |
f30c2269 | 2 | * arch/xtensa/mm/tlb.c |
3f65ce4d CZ |
3 | * |
4 | * Logic that manipulates the Xtensa MMU. Derived from MIPS. | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | * | |
10 | * Copyright (C) 2001 - 2003 Tensilica Inc. | |
11 | * | |
12 | * Joe Taylor | |
13 | * Chris Zankel <chris@zankel.net> | |
14 | * Marc Gauthier | |
15 | */ | |
16 | ||
17 | #include <linux/mm.h> | |
18 | #include <asm/processor.h> | |
19 | #include <asm/mmu_context.h> | |
20 | #include <asm/tlbflush.h> | |
21 | #include <asm/system.h> | |
22 | #include <asm/cacheflush.h> | |
23 | ||
24 | ||
25 | static inline void __flush_itlb_all (void) | |
26 | { | |
173d6681 | 27 | int w, i; |
3f65ce4d | 28 | |
173d6681 CZ |
29 | for (w = 0; w < ITLB_ARF_WAYS; w++) { |
30 | for (i = 0; i < (1 << XCHAL_ITLB_ARF_ENTRIES_LOG2); i++) { | |
31 | int e = w + (i << PAGE_SHIFT); | |
32 | invalidate_itlb_entry_no_isync(e); | |
3f65ce4d CZ |
33 | } |
34 | } | |
35 | asm volatile ("isync\n"); | |
36 | } | |
37 | ||
38 | static inline void __flush_dtlb_all (void) | |
39 | { | |
173d6681 | 40 | int w, i; |
3f65ce4d | 41 | |
173d6681 CZ |
42 | for (w = 0; w < DTLB_ARF_WAYS; w++) { |
43 | for (i = 0; i < (1 << XCHAL_DTLB_ARF_ENTRIES_LOG2); i++) { | |
44 | int e = w + (i << PAGE_SHIFT); | |
45 | invalidate_dtlb_entry_no_isync(e); | |
3f65ce4d CZ |
46 | } |
47 | } | |
48 | asm volatile ("isync\n"); | |
49 | } | |
50 | ||
51 | ||
52 | void flush_tlb_all (void) | |
53 | { | |
54 | __flush_itlb_all(); | |
55 | __flush_dtlb_all(); | |
56 | } | |
57 | ||
58 | /* If mm is current, we simply assign the current task a new ASID, thus, | |
59 | * invalidating all previous tlb entries. If mm is someone else's user mapping, | |
60 | * wie invalidate the context, thus, when that user mapping is swapped in, | |
61 | * a new context will be assigned to it. | |
62 | */ | |
63 | ||
64 | void flush_tlb_mm(struct mm_struct *mm) | |
65 | { | |
3f65ce4d CZ |
66 | if (mm == current->active_mm) { |
67 | int flags; | |
68 | local_save_flags(flags); | |
173d6681 CZ |
69 | __get_new_mmu_context(mm); |
70 | __load_mmu_context(mm); | |
3f65ce4d CZ |
71 | local_irq_restore(flags); |
72 | } | |
73 | else | |
74 | mm->context = 0; | |
75 | } | |
76 | ||
173d6681 CZ |
77 | #define _ITLB_ENTRIES (ITLB_ARF_WAYS << XCHAL_ITLB_ARF_ENTRIES_LOG2) |
78 | #define _DTLB_ENTRIES (DTLB_ARF_WAYS << XCHAL_DTLB_ARF_ENTRIES_LOG2) | |
79 | #if _ITLB_ENTRIES > _DTLB_ENTRIES | |
80 | # define _TLB_ENTRIES _ITLB_ENTRIES | |
81 | #else | |
82 | # define _TLB_ENTRIES _DTLB_ENTRIES | |
83 | #endif | |
84 | ||
3f65ce4d CZ |
85 | void flush_tlb_range (struct vm_area_struct *vma, |
86 | unsigned long start, unsigned long end) | |
87 | { | |
88 | struct mm_struct *mm = vma->vm_mm; | |
89 | unsigned long flags; | |
90 | ||
91 | if (mm->context == NO_CONTEXT) | |
92 | return; | |
93 | ||
94 | #if 0 | |
95 | printk("[tlbrange<%02lx,%08lx,%08lx>]\n", | |
96 | (unsigned long)mm->context, start, end); | |
97 | #endif | |
98 | local_save_flags(flags); | |
99 | ||
173d6681 | 100 | if (end-start + (PAGE_SIZE-1) <= _TLB_ENTRIES << PAGE_SHIFT) { |
3f65ce4d CZ |
101 | int oldpid = get_rasid_register(); |
102 | set_rasid_register (ASID_INSERT(mm->context)); | |
103 | start &= PAGE_MASK; | |
104 | if (vma->vm_flags & VM_EXEC) | |
105 | while(start < end) { | |
106 | invalidate_itlb_mapping(start); | |
107 | invalidate_dtlb_mapping(start); | |
108 | start += PAGE_SIZE; | |
109 | } | |
110 | else | |
111 | while(start < end) { | |
112 | invalidate_dtlb_mapping(start); | |
113 | start += PAGE_SIZE; | |
114 | } | |
115 | ||
116 | set_rasid_register(oldpid); | |
117 | } else { | |
173d6681 | 118 | flush_tlb_mm(mm); |
3f65ce4d CZ |
119 | } |
120 | local_irq_restore(flags); | |
121 | } | |
122 | ||
123 | void flush_tlb_page (struct vm_area_struct *vma, unsigned long page) | |
124 | { | |
125 | struct mm_struct* mm = vma->vm_mm; | |
126 | unsigned long flags; | |
127 | int oldpid; | |
3f65ce4d CZ |
128 | |
129 | if(mm->context == NO_CONTEXT) | |
130 | return; | |
131 | ||
132 | local_save_flags(flags); | |
133 | ||
134 | oldpid = get_rasid_register(); | |
135 | ||
136 | if (vma->vm_flags & VM_EXEC) | |
137 | invalidate_itlb_mapping(page); | |
138 | invalidate_dtlb_mapping(page); | |
139 | ||
140 | set_rasid_register(oldpid); | |
141 | ||
142 | local_irq_restore(flags); | |
3f65ce4d CZ |
143 | } |
144 |