1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * dtlb_prot.S: DTLB protection trap strategy.
4 * This is included directly into
5 *
6 * Copyright (C) 1996,1998 David S. Miller (da
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj
8 */
9
10 /* Ways we can get here:
11 *
12 * [TL == 0] 1) User stores to readonly pages.
13 * [TL == 0] 2) Nucleus stores to user readonl
14 * [TL > 0] 3) Nucleus stores to user readonl
15 */
16
17 /* PROT ** ICACHE line 1: User DTLB protection
18 mov TLB_SFSR, %g1
19 stxa %g0, [%g1] ASI_DMMU
20 membar #Sync
21 rdpr %pstate, %g5
22 wrpr %g5, PSTATE_AG|PSTATE_
23 rdpr %tl, %g1
24 cmp %g1, 1
25 mov TLB_TAG_ACCESS, %g4
26
27 /* PROT ** ICACHE line 2: More real fault proc
28 ldxa [%g4] ASI_DMMU, %g5
29 srlx %g5, PAGE_SHIFT, %g5
30 sllx %g5, PAGE_SHIFT, %g5
31 bgu,pn %xcc, winfix_trampolin
32 mov FAULT_CODE_DTLB | FAUL
33 ba,pt %xcc, sparc64_realfaul
34 nop
35 nop
36
37 /* PROT ** ICACHE line 3: Unused... */
38 nop
39 nop
40 nop
41 nop
42 nop
43 nop
44 nop
45 nop
46
47 /* PROT ** ICACHE line 4: Unused... */
48 nop
49 nop
50 nop
51 nop
52 nop
53 nop
54 nop
55 nop
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