David Howells | 7f386ac | 2011-03-18 16:54:30 +0000 | [diff] [blame] | 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 |