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5df87c15 RK |
1 | /* |
2 | * Hexagon Virtual Machine TLB functions | |
3 | * | |
e1858b2a | 4 | * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. |
5df87c15 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 | /* | |
22 | * The Hexagon Virtual Machine conceals the real workings of | |
23 | * the TLB, but there are one or two functions that need to | |
24 | * be instantiated for it, differently from a native build. | |
25 | */ | |
26 | #include <linux/mm.h> | |
27 | #include <asm/page.h> | |
28 | #include <asm/hexagon_vm.h> | |
29 | ||
30 | /* | |
31 | * Initial VM implementation has only one map active at a time, with | |
32 | * TLB purgings on changes. So either we're nuking the current map, | |
33 | * or it's a no-op. This operation is messy on true SMPs where other | |
34 | * processors must be induced to flush the copies in their local TLBs, | |
35 | * but Hexagon thread-based virtual processors share the same MMU. | |
36 | */ | |
37 | void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, | |
38 | unsigned long end) | |
39 | { | |
40 | struct mm_struct *mm = vma->vm_mm; | |
41 | ||
42 | if (mm->context.ptbase == current->active_mm->context.ptbase) | |
43 | __vmclrmap((void *)start, end - start); | |
44 | } | |
45 | ||
46 | /* | |
47 | * Flush a page from the kernel virtual map - used by highmem | |
48 | */ | |
49 | void flush_tlb_one(unsigned long vaddr) | |
50 | { | |
51 | __vmclrmap((void *)vaddr, PAGE_SIZE); | |
52 | } | |
53 | ||
54 | /* | |
55 | * Flush all TLBs across all CPUs, virtual or real. | |
56 | * A single Hexagon core has 6 thread contexts but | |
57 | * only one TLB. | |
58 | */ | |
59 | void tlb_flush_all(void) | |
60 | { | |
61 | /* should probably use that fixaddr end or whateve label */ | |
62 | __vmclrmap(0, 0xffff0000); | |
63 | } | |
64 | ||
65 | /* | |
66 | * Flush TLB entries associated with a given mm_struct mapping. | |
67 | */ | |
68 | void flush_tlb_mm(struct mm_struct *mm) | |
69 | { | |
70 | /* Current Virtual Machine has only one map active at a time */ | |
71 | if (current->active_mm->context.ptbase == mm->context.ptbase) | |
72 | tlb_flush_all(); | |
73 | } | |
74 | ||
75 | /* | |
76 | * Flush TLB state associated with a page of a vma. | |
77 | */ | |
78 | void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr) | |
79 | { | |
80 | struct mm_struct *mm = vma->vm_mm; | |
81 | ||
82 | if (mm->context.ptbase == current->active_mm->context.ptbase) | |
83 | __vmclrmap((void *)vaddr, PAGE_SIZE); | |
84 | } | |
85 | ||
86 | /* | |
87 | * Flush TLB entries associated with a kernel address range. | |
88 | * Like flush range, but without the check on the vma->vm_mm. | |
89 | */ | |
90 | void flush_tlb_kernel_range(unsigned long start, unsigned long end) | |
91 | { | |
92 | __vmclrmap((void *)start, end - start); | |
93 | } |