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 */
26 void 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 */
38 void 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 */
48 void 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 */
57 void 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 */
67 void 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 */
79 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
80 {
81 __vmclrmap((void *)start, end - start);
82 }
83
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.