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1 | /* MN10300 CPU cache invalidation routines, using direct tag flushing |
2 | * | |
3 | * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | #include <linux/sys.h> | |
12 | #include <linux/linkage.h> | |
13 | #include <asm/smp.h> | |
14 | #include <asm/page.h> | |
15 | #include <asm/cache.h> | |
16 | #include <asm/irqflags.h> | |
17 | #include <asm/cacheflush.h> | |
18 | #include "cache.inc" | |
19 | ||
20 | .am33_2 | |
21 | ||
22 | .globl debugger_local_cache_flushinv_one_icache | |
23 | ||
24 | ############################################################################### | |
25 | # | |
26 | # void debugger_local_cache_flushinv_one(u8 *addr) | |
27 | # | |
28 | # Invalidate one particular cacheline if it's in the icache | |
29 | # | |
30 | ############################################################################### | |
31 | ALIGN | |
32 | .globl debugger_local_cache_flushinv_one_icache | |
33 | .type debugger_local_cache_flushinv_one_icache,@function | |
34 | debugger_local_cache_flushinv_one_icache: | |
35 | movm [d3,a2],(sp) | |
36 | ||
37 | mov CHCTR,a2 | |
38 | movhu (a2),d0 | |
39 | btst CHCTR_ICEN,d0 | |
40 | beq debugger_local_cache_flushinv_one_icache_end | |
41 | ||
42 | mov d0,a1 | |
43 | and L1_CACHE_TAG_MASK,a1 | |
44 | ||
45 | # read the tags from the tag RAM, and if they indicate a matching valid | |
46 | # cache line then we invalidate that line | |
47 | mov ICACHE_TAG(0,0),a0 | |
48 | mov a1,d0 | |
49 | and L1_CACHE_TAG_ENTRY,d0 | |
50 | add d0,a0 # starting icache tag RAM | |
51 | # access address | |
52 | ||
53 | and ~(L1_CACHE_DISPARITY-1),a1 # determine comparator base | |
54 | or L1_CACHE_TAG_VALID,a1 | |
55 | mov L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_VALID,d1 | |
56 | ||
57 | LOCAL_CLI_SAVE(d3) | |
58 | ||
59 | # disable the icache | |
60 | movhu (a2),d0 | |
61 | and ~CHCTR_ICEN,d0 | |
62 | movhu d0,(a2) | |
63 | ||
64 | # and wait for it to calm down | |
65 | setlb | |
66 | movhu (a2),d0 | |
67 | btst CHCTR_ICBUSY,d0 | |
68 | lne | |
69 | ||
70 | # check all the way tags for this cache entry | |
71 | mov (a0),d0 # read the tag in the way 0 slot | |
72 | xor a1,d0 | |
73 | and d1,d0 | |
74 | beq debugger_local_icache_kill # jump if matched | |
75 | ||
76 | add L1_CACHE_WAYDISP,a0 | |
77 | mov (a0),d0 # read the tag in the way 1 slot | |
78 | xor a1,d0 | |
79 | and d1,d0 | |
80 | beq debugger_local_icache_kill # jump if matched | |
81 | ||
82 | add L1_CACHE_WAYDISP,a0 | |
83 | mov (a0),d0 # read the tag in the way 2 slot | |
84 | xor a1,d0 | |
85 | and d1,d0 | |
86 | beq debugger_local_icache_kill # jump if matched | |
87 | ||
88 | add L1_CACHE_WAYDISP,a0 | |
89 | mov (a0),d0 # read the tag in the way 3 slot | |
90 | xor a1,d0 | |
91 | and d1,d0 | |
92 | bne debugger_local_icache_finish # jump if not matched | |
93 | ||
94 | debugger_local_icache_kill: | |
95 | mov d0,(a0) # kill the tag (D0 is 0 at this point) | |
96 | ||
97 | debugger_local_icache_finish: | |
98 | # wait for the cache to finish what it's doing | |
99 | setlb | |
100 | movhu (a2),d0 | |
101 | btst CHCTR_ICBUSY,d0 | |
102 | lne | |
103 | ||
104 | # and reenable it | |
105 | or CHCTR_ICEN,d0 | |
106 | movhu d0,(a2) | |
107 | movhu (a2),d0 | |
108 | ||
109 | # re-enable interrupts | |
110 | LOCAL_IRQ_RESTORE(d3) | |
111 | ||
112 | debugger_local_cache_flushinv_one_icache_end: | |
113 | ret [d3,a2],8 | |
114 | .size debugger_local_cache_flushinv_one_icache,.-debugger_local_cache_flushinv_one_icache | |
115 | ||
116 | #ifdef CONFIG_MN10300_DEBUGGER_CACHE_INV_BY_TAG | |
117 | .globl debugger_local_cache_flushinv_one | |
118 | .type debugger_local_cache_flushinv_one,@function | |
119 | debugger_local_cache_flushinv_one = debugger_local_cache_flushinv_one_icache | |
120 | #endif |