1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Hexagon Virtual Machine TLB functions
4 *
5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
6 */
7
8/*
9 * The Hexagon Virtual Machine conceals the real workings of
10 * the TLB, but there are one or two functions that need to
11 * be instantiated for it, differently from a native build.
12 */
13#include <linux/mm.h>
14#include <linux/sched.h>
15#include <asm/page.h>
16#include <asm/hexagon_vm.h>
17#include <asm/tlbflush.h>
18
19/*
20 * Initial VM implementation has only one map active at a time, with
21 * TLB purgings on changes.  So either we're nuking the current map,
22 * or it's a no-op.  This operation is messy on true SMPs where other
23 * processors must be induced to flush the copies in their local TLBs,
24 * but Hexagon thread-based virtual processors share the same MMU.
25 */
26void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
27			unsigned long end)
28{
29	struct mm_struct *mm = vma->vm_mm;
30
31	if (mm->context.ptbase == current->active_mm->context.ptbase)
32		__vmclrmap((void *)start, end - start);
33}
34
35/*
36 * Flush a page from the kernel virtual map - used by highmem
37 */
38void flush_tlb_one(unsigned long vaddr)
39{
40	__vmclrmap((void *)vaddr, PAGE_SIZE);
41}
42
43/*
44 * Flush all TLBs across all CPUs, virtual or real.
45 * A single Hexagon core has 6 thread contexts but
46 * only one TLB.
47 */
48void tlb_flush_all(void)
49{
50	/*  should probably use that fixaddr end or whateve label  */
51	__vmclrmap(0, 0xffff0000);
52}
53
54/*
55 * Flush TLB entries associated with a given mm_struct mapping.
56 */
57void flush_tlb_mm(struct mm_struct *mm)
58{
59	/* Current Virtual Machine has only one map active at a time */
60	if (current->active_mm->context.ptbase == mm->context.ptbase)
61		tlb_flush_all();
62}
63
64/*
65 * Flush TLB state associated with a page of a vma.
66 */
67void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr)
68{
69	struct mm_struct *mm = vma->vm_mm;
70
71	if (mm->context.ptbase  == current->active_mm->context.ptbase)
72		__vmclrmap((void *)vaddr, PAGE_SIZE);
73}
74
75/*
76 * Flush TLB entries associated with a kernel address range.
77 * Like flush range, but without the check on the vma->vm_mm.
78 */
79void flush_tlb_kernel_range(unsigned long start, unsigned long end)
80{
81		__vmclrmap((void *)start, end - start);
82}
83