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https://github.com/torvalds/linux
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106 lines
2.7 KiB
ArmAsm
106 lines
2.7 KiB
ArmAsm
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###############################################################################
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#
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# MN10300 Low-level cache purging routines for gdbstub
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#
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# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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# Written by David Howells (dhowells@redhat.com)
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public Licence
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# as published by the Free Software Foundation; either version
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# 2 of the Licence, or (at your option) any later version.
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#
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###############################################################################
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#include <linux/sys.h>
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#include <linux/linkage.h>
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#include <asm/smp.h>
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#include <asm/cache.h>
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#include <asm/cpu-regs.h>
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#include <asm/exceptions.h>
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#include <asm/frame.inc>
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#include <asm/serial-regs.h>
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.text
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###############################################################################
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#
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# GDB stub cache purge
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#
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###############################################################################
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.type gdbstub_purge_cache,@function
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ENTRY(gdbstub_purge_cache)
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#######################################################################
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# read the addresses tagged in the cache's tag RAM and attempt to flush
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# those addresses specifically
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# - we rely on the hardware to filter out invalid tag entry addresses
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mov DCACHE_TAG(0,0),a0 # dcache tag RAM access address
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mov DCACHE_PURGE(0,0),a1 # dcache purge request address
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mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of entries
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mn10300_dcache_flush_loop:
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mov (a0),d0
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and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0
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or L1_CACHE_TAG_VALID,d0 # retain valid entries in the
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# cache
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mov d0,(a1) # conditional purge
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mn10300_dcache_flush_skip:
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add L1_CACHE_BYTES,a0
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add L1_CACHE_BYTES,a1
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add -1,d1
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bne mn10300_dcache_flush_loop
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;; # unconditionally flush and invalidate the dcache
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;; mov DCACHE_PURGE(0,0),a1 # dcache purge request address
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;; mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of
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;; # entries
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;;
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;; gdbstub_purge_cache__dcache_loop:
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;; mov (a1),d0 # unconditional purge
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;;
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;; add L1_CACHE_BYTES,a1
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;; add -1,d1
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;; bne gdbstub_purge_cache__dcache_loop
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#######################################################################
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# now invalidate the icache
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mov CHCTR,a0
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movhu (a0),a1
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mov epsw,d1
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and ~EPSW_IE,epsw
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nop
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nop
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# disable the icache
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and ~CHCTR_ICEN,d0
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movhu d0,(a0)
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# and wait for it to calm down
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setlb
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movhu (a0),d0
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btst CHCTR_ICBUSY,d0
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lne
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# invalidate
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or CHCTR_ICINV,d0
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movhu d0,(a0)
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# wait for the cache to finish
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mov CHCTR,a0
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setlb
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movhu (a0),d0
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btst CHCTR_ICBUSY,d0
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lne
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# and reenable it
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movhu a1,(a0)
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movhu (a0),d0 # read back to flush
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# (SIGILLs all over without this)
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mov d1,epsw
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ret [],0
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.size gdbstub_purge_cache,.-gdbstub_purge_cache
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