121 lines
2.7 KiB
ArmAsm
121 lines
2.7 KiB
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Cache flushing routines.
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*
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* Copyright (C) 1999-2001, 2005 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*
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* 05/28/05 Zoltan Menyhart Dynamic stride size
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*/
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#include <asm/asmmacro.h>
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#include <asm/export.h>
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/*
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* flush_icache_range(start,end)
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*
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* Make i-cache(s) coherent with d-caches.
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*
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* Must deal with range from start to end-1 but nothing else (need to
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* be careful not to touch addresses that may be unmapped).
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*
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* Note: "in0" and "in1" are preserved for debugging purposes.
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*/
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.section .kprobes.text,"ax"
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GLOBAL_ENTRY(flush_icache_range)
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.prologue
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alloc r2=ar.pfs,2,0,0,0
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movl r3=ia64_i_cache_stride_shift
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mov r21=1
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;;
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ld8 r20=[r3] // r20: stride shift
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sub r22=in1,r0,1 // last byte address
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;;
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shr.u r23=in0,r20 // start / (stride size)
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shr.u r22=r22,r20 // (last byte address) / (stride size)
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shl r21=r21,r20 // r21: stride size of the i-cache(s)
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;;
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sub r8=r22,r23 // number of strides - 1
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shl r24=r23,r20 // r24: addresses for "fc.i" =
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// "start" rounded down to stride boundary
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.save ar.lc,r3
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mov r3=ar.lc // save ar.lc
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;;
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.body
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mov ar.lc=r8
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;;
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/*
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* 32 byte aligned loop, even number of (actually 2) bundles
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*/
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.Loop: fc.i r24 // issuable on M0 only
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add r24=r21,r24 // we flush "stride size" bytes per iteration
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nop.i 0
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br.cloop.sptk.few .Loop
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;;
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sync.i
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;;
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srlz.i
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;;
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mov ar.lc=r3 // restore ar.lc
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br.ret.sptk.many rp
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END(flush_icache_range)
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EXPORT_SYMBOL_GPL(flush_icache_range)
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/*
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* clflush_cache_range(start,size)
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*
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* Flush cache lines from start to start+size-1.
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*
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* Must deal with range from start to start+size-1 but nothing else
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* (need to be careful not to touch addresses that may be
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* unmapped).
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*
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* Note: "in0" and "in1" are preserved for debugging purposes.
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*/
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.section .kprobes.text,"ax"
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GLOBAL_ENTRY(clflush_cache_range)
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.prologue
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alloc r2=ar.pfs,2,0,0,0
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movl r3=ia64_cache_stride_shift
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mov r21=1
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add r22=in1,in0
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;;
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ld8 r20=[r3] // r20: stride shift
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sub r22=r22,r0,1 // last byte address
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;;
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shr.u r23=in0,r20 // start / (stride size)
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shr.u r22=r22,r20 // (last byte address) / (stride size)
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shl r21=r21,r20 // r21: stride size of the i-cache(s)
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;;
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sub r8=r22,r23 // number of strides - 1
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shl r24=r23,r20 // r24: addresses for "fc" =
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// "start" rounded down to stride
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// boundary
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.save ar.lc,r3
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mov r3=ar.lc // save ar.lc
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;;
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.body
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mov ar.lc=r8
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;;
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/*
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* 32 byte aligned loop, even number of (actually 2) bundles
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*/
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.Loop_fc:
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fc r24 // issuable on M0 only
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add r24=r21,r24 // we flush "stride size" bytes per iteration
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nop.i 0
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br.cloop.sptk.few .Loop_fc
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;;
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sync.i
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;;
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srlz.i
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;;
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mov ar.lc=r3 // restore ar.lc
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br.ret.sptk.many rp
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END(clflush_cache_range)
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