summaryrefslogtreecommitdiff
path: root/arch/hexagon/mm/vm_tlb.c
blob: 53482f2a9ff9419d888c12ca5d4ce192a6f65c17 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Hexagon Virtual Machine TLB functions
 *
 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
 */

/*
 * The Hexagon Virtual Machine conceals the real workings of
 * the TLB, but there are one or two functions that need to
 * be instantiated for it, differently from a native build.
 */
#include <linux/mm.h>
#include <linux/sched.h>
#include <asm/page.h>
#include <asm/hexagon_vm.h>

/*
 * Initial VM implementation has only one map active at a time, with
 * TLB purgings on changes.  So either we're nuking the current map,
 * or it's a no-op.  This operation is messy on true SMPs where other
 * processors must be induced to flush the copies in their local TLBs,
 * but Hexagon thread-based virtual processors share the same MMU.
 */
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
			unsigned long end)
{
	struct mm_struct *mm = vma->vm_mm;

	if (mm->context.ptbase == current->active_mm->context.ptbase)
		__vmclrmap((void *)start, end - start);
}

/*
 * Flush a page from the kernel virtual map - used by highmem
 */
void flush_tlb_one(unsigned long vaddr)
{
	__vmclrmap((void *)vaddr, PAGE_SIZE);
}

/*
 * Flush all TLBs across all CPUs, virtual or real.
 * A single Hexagon core has 6 thread contexts but
 * only one TLB.
 */
void tlb_flush_all(void)
{
	/*  should probably use that fixaddr end or whateve label  */
	__vmclrmap(0, 0xffff0000);
}

/*
 * Flush TLB entries associated with a given mm_struct mapping.
 */
void flush_tlb_mm(struct mm_struct *mm)
{
	/* Current Virtual Machine has only one map active at a time */
	if (current->active_mm->context.ptbase == mm->context.ptbase)
		tlb_flush_all();
}

/*
 * Flush TLB state associated with a page of a vma.
 */
void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr)
{
	struct mm_struct *mm = vma->vm_mm;

	if (mm->context.ptbase  == current->active_mm->context.ptbase)
		__vmclrmap((void *)vaddr, PAGE_SIZE);
}

/*
 * Flush TLB entries associated with a kernel address range.
 * Like flush range, but without the check on the vma->vm_mm.
 */
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
		__vmclrmap((void *)start, end - start);
}