]>
Commit | Line | Data |
---|---|---|
08dbd0f8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
5df87c15 RK |
2 | /* |
3 | * Hexagon Virtual Machine TLB functions | |
4 | * | |
e1858b2a | 5 | * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. |
5df87c15 RK |
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> | |
00f3ca2c | 14 | #include <linux/sched.h> |
5df87c15 RK |
15 | #include <asm/page.h> |
16 | #include <asm/hexagon_vm.h> | |
17 | ||
18 | /* | |
19 | * Initial VM implementation has only one map active at a time, with | |
20 | * TLB purgings on changes. So either we're nuking the current map, | |
21 | * or it's a no-op. This operation is messy on true SMPs where other | |
22 | * processors must be induced to flush the copies in their local TLBs, | |
23 | * but Hexagon thread-based virtual processors share the same MMU. | |
24 | */ | |
25 | void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, | |
26 | unsigned long end) | |
27 | { | |
28 | struct mm_struct *mm = vma->vm_mm; | |
29 | ||
30 | if (mm->context.ptbase == current->active_mm->context.ptbase) | |
31 | __vmclrmap((void *)start, end - start); | |
32 | } | |
33 | ||
34 | /* | |
35 | * Flush a page from the kernel virtual map - used by highmem | |
36 | */ | |
37 | void flush_tlb_one(unsigned long vaddr) | |
38 | { | |
39 | __vmclrmap((void *)vaddr, PAGE_SIZE); | |
40 | } | |
41 | ||
42 | /* | |
43 | * Flush all TLBs across all CPUs, virtual or real. | |
44 | * A single Hexagon core has 6 thread contexts but | |
45 | * only one TLB. | |
46 | */ | |
47 | void tlb_flush_all(void) | |
48 | { | |
49 | /* should probably use that fixaddr end or whateve label */ | |
50 | __vmclrmap(0, 0xffff0000); | |
51 | } | |
52 | ||
53 | /* | |
54 | * Flush TLB entries associated with a given mm_struct mapping. | |
55 | */ | |
56 | void flush_tlb_mm(struct mm_struct *mm) | |
57 | { | |
58 | /* Current Virtual Machine has only one map active at a time */ | |
59 | if (current->active_mm->context.ptbase == mm->context.ptbase) | |
60 | tlb_flush_all(); | |
61 | } | |
62 | ||
63 | /* | |
64 | * Flush TLB state associated with a page of a vma. | |
65 | */ | |
66 | void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr) | |
67 | { | |
68 | struct mm_struct *mm = vma->vm_mm; | |
69 | ||
70 | if (mm->context.ptbase == current->active_mm->context.ptbase) | |
71 | __vmclrmap((void *)vaddr, PAGE_SIZE); | |
72 | } | |
73 | ||
74 | /* | |
75 | * Flush TLB entries associated with a kernel address range. | |
76 | * Like flush range, but without the check on the vma->vm_mm. | |
77 | */ | |
78 | void flush_tlb_kernel_range(unsigned long start, unsigned long end) | |
79 | { | |
80 | __vmclrmap((void *)start, end - start); | |
81 | } |