blob: c6ff415754615dd5be37bc032823c2b9e8dd0845 [file] [log] [blame]
Richard Kuo5df87c12011-10-31 18:52:00 -05001/*
2 * Hexagon Virtual Machine TLB functions
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/*
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 */
37void 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 */
49void 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 */
59void 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 */
68void 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 */
78void 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 */
90void flush_tlb_kernel_range(unsigned long start, unsigned long end)
91{
92 __vmclrmap((void *)start, end - start);
93}