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cache-flush-mn10300.S
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cache-flush-mn10300.S
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/* MN10300 CPU core caching routines
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells ([email protected])
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/smp.h>
#include <asm/page.h>
#include <asm/cache.h>
.am33_2
.globl mn10300_dcache_flush
.globl mn10300_dcache_flush_page
.globl mn10300_dcache_flush_range
.globl mn10300_dcache_flush_range2
.globl mn10300_dcache_flush_inv
.globl mn10300_dcache_flush_inv_page
.globl mn10300_dcache_flush_inv_range
.globl mn10300_dcache_flush_inv_range2
###############################################################################
#
# void mn10300_dcache_flush(void)
# Flush the entire data cache back to RAM
#
###############################################################################
ALIGN
mn10300_dcache_flush:
movhu (CHCTR),d0
btst CHCTR_DCEN,d0
beq mn10300_dcache_flush_end
# read the addresses tagged in the cache's tag RAM and attempt to flush
# those addresses specifically
# - we rely on the hardware to filter out invalid tag entry addresses
mov DCACHE_TAG(0,0),a0 # dcache tag RAM access address
mov DCACHE_PURGE(0,0),a1 # dcache purge request address
mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of entries
mn10300_dcache_flush_loop:
mov (a0),d0
and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0
or L1_CACHE_TAG_VALID,d0 # retain valid entries in the
# cache
mov d0,(a1) # conditional purge
mn10300_dcache_flush_skip:
add L1_CACHE_BYTES,a0
add L1_CACHE_BYTES,a1
add -1,d1
bne mn10300_dcache_flush_loop
mn10300_dcache_flush_end:
ret [],0
###############################################################################
#
# void mn10300_dcache_flush_page(unsigned start)
# void mn10300_dcache_flush_range(unsigned start, unsigned end)
# void mn10300_dcache_flush_range2(unsigned start, unsigned size)
# Flush a range of addresses on a page in the dcache
#
###############################################################################
ALIGN
mn10300_dcache_flush_page:
mov PAGE_SIZE,d1
mn10300_dcache_flush_range2:
add d0,d1
mn10300_dcache_flush_range:
movm [d2,d3],(sp)
movhu (CHCTR),d2
btst CHCTR_DCEN,d2
beq mn10300_dcache_flush_range_end
# round start addr down
and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0
mov d0,a1
add L1_CACHE_BYTES,d1 # round end addr up
and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d1
# write a request to flush all instances of an address from the cache
mov DCACHE_PURGE(0,0),a0
mov a1,d0
and L1_CACHE_TAG_ENTRY,d0
add d0,a0 # starting dcache purge control
# reg address
sub a1,d1
lsr L1_CACHE_SHIFT,d1 # total number of entries to
# examine
or L1_CACHE_TAG_VALID,a1 # retain valid entries in the
# cache
mn10300_dcache_flush_range_loop:
mov a1,(L1_CACHE_WAYDISP*0,a0) # conditionally purge this line
# all ways
add L1_CACHE_BYTES,a0
add L1_CACHE_BYTES,a1
and ~L1_CACHE_WAYDISP,a0 # make sure way stay on way 0
add -1,d1
bne mn10300_dcache_flush_range_loop
mn10300_dcache_flush_range_end:
ret [d2,d3],8
###############################################################################
#
# void mn10300_dcache_flush_inv(void)
# Flush the entire data cache and invalidate all entries
#
###############################################################################
ALIGN
mn10300_dcache_flush_inv:
movhu (CHCTR),d0
btst CHCTR_DCEN,d0
beq mn10300_dcache_flush_inv_end
# hit each line in the dcache with an unconditional purge
mov DCACHE_PURGE(0,0),a1 # dcache purge request address
mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of entries
mn10300_dcache_flush_inv_loop:
mov (a1),d0 # unconditional purge
add L1_CACHE_BYTES,a1
add -1,d1
bne mn10300_dcache_flush_inv_loop
mn10300_dcache_flush_inv_end:
ret [],0
###############################################################################
#
# void mn10300_dcache_flush_inv_page(unsigned start)
# void mn10300_dcache_flush_inv_range(unsigned start, unsigned end)
# void mn10300_dcache_flush_inv_range2(unsigned start, unsigned size)
# Flush and invalidate a range of addresses on a page in the dcache
#
###############################################################################
ALIGN
mn10300_dcache_flush_inv_page:
mov PAGE_SIZE,d1
mn10300_dcache_flush_inv_range2:
add d0,d1
mn10300_dcache_flush_inv_range:
movm [d2,d3],(sp)
movhu (CHCTR),d2
btst CHCTR_DCEN,d2
beq mn10300_dcache_flush_inv_range_end
and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0 # round start
# addr down
mov d0,a1
add L1_CACHE_BYTES,d1 # round end addr up
and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d1
# write a request to flush and invalidate all instances of an address
# from the cache
mov DCACHE_PURGE(0,0),a0
mov a1,d0
and L1_CACHE_TAG_ENTRY,d0
add d0,a0 # starting dcache purge control
# reg address
sub a1,d1
lsr L1_CACHE_SHIFT,d1 # total number of entries to
# examine
mn10300_dcache_flush_inv_range_loop:
mov a1,(L1_CACHE_WAYDISP*0,a0) # conditionally purge this line
# in all ways
add L1_CACHE_BYTES,a0
add L1_CACHE_BYTES,a1
and ~L1_CACHE_WAYDISP,a0 # make sure way stay on way 0
add -1,d1
bne mn10300_dcache_flush_inv_range_loop
mn10300_dcache_flush_inv_range_end:
ret [d2,d3],8