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[IA64] improve flush_icache_range()

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Check with PAL to see what the i-cache line size is for
each level of the cache, and so use the correct stride
when flushing the cache.

Acked-by: David Mosberger
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Zoltan Menyhart
2005-06-03 05:36:00 -07:00
committed by Tony Luck
parent 60a762b6a6
commit 08357f82d4
2 changed files with 69 additions and 14 deletions
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46
arch/ia64/lib/flush.S
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@@ -3,37 +3,59 @@
*
* Copyright (C) 1999-2001, 2005 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
*
* 05/28/05 Zoltan Menyhart Dynamic stride size
*/
#include <asm/asmmacro.h>
#include <asm/page.h>
/*
* flush_icache_range(start,end)
* Must flush range from start to end-1 but nothing else (need to
*
* Make i-cache(s) coherent with d-caches.
*
* Must deal with range from start to end-1 but nothing else (need to
* be careful not to touch addresses that may be unmapped).
*
* Note: "in0" and "in1" are preserved for debugging purposes.
*/
GLOBAL_ENTRY(flush_icache_range)
.prologue
alloc r2=ar.pfs,2,0,0,0
sub r8=in1,in0,1
alloc r2=ar.pfs,2,0,0,0
movl r3=ia64_i_cache_stride_shift
mov r21=1
;;
shr.u r8=r8,5 // we flush 32 bytes per iteration
.save ar.lc, r3
mov r3=ar.lc // save ar.lc
ld8 r20=[r3] // r20: stride shift
sub r22=in1,r0,1 // last byte address
;;
shr.u r23=in0,r20 // start / (stride size)
shr.u r22=r22,r20 // (last byte address) / (stride size)
shl r21=r21,r20 // r21: stride size of the i-cache(s)
;;
sub r8=r22,r23 // number of strides - 1
shl r24=r23,r20 // r24: addresses for "fc.i" =
// "start" rounded down to stride boundary
.save ar.lc,r3
mov r3=ar.lc // save ar.lc
;;
.body
mov ar.lc=r8
mov ar.lc=r8
;;
.Loop: fc.i in0 // issuable on M2 only
add in0=32,in0
/*
* 32 byte aligned loop, even number of (actually 2) bundles
*/
.Loop: fc.i r24 // issuable on M0 only
add r24=r21,r24 // we flush "stride size" bytes per iteration
nop.i 0
br.cloop.sptk.few .Loop
;;
sync.i
;;
srlz.i
;;
mov ar.lc=r3 // restore ar.lc
mov ar.lc=r3 // restore ar.lc
br.ret.sptk.many rp
END(flush_icache_range)