/* tlb-flush.S: TLB flushing routines
*
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/spr-regs.h>
.macro DEBUG ch
# sethi.p %hi(0xfeff9c00),gr4
# setlo %lo(0xfeff9c00),gr4
# setlos #\ch,gr5
# stbi gr5,@(gr4,#0)
# membar
.endm
.section .rodata
# sizes corresponding to TPXR.LMAX
.balign 1
__tlb_lmax_sizes:
.byte 0, 64, 0, 0
.byte 0, 0, 0, 0
.byte 0, 0, 0, 0
.byte 0, 0, 0, 0
.section .text
.balign 4
###############################################################################
#
# flush everything
# - void __flush_tlb_all(void)
#
###############################################################################
.globl __flush_tlb_all
.type __flush_tlb_all,@function
__flush_tlb_all:
DEBUG 'A'
# kill cached PGE value
setlos #0xffffffff,gr4
movgs gr4,scr0
movgs gr4,scr1
# kill AMPR-cached TLB values
movgs gr0,iamlr1
movgs gr0,iampr1
movgs gr0,damlr1
movgs gr0,dampr1
# find out how many lines there are
movsg tpxr,gr5
sethi.p %hi(__tlb_lmax_sizes),gr4
srli gr5,#TPXR_LMAX_SHIFT,gr5
setlo.p %lo(__tlb_lmax_sizes),gr4
andi gr5,#TPXR_LMAX_SMASK,gr5
ldub @(gr4,gr5),gr4
# now, we assume that the TLB line step is page size in size
setlos.p #PAGE_SIZE,gr5
setlos #0,gr6
1:
tlbpr gr6,gr0,#6,#0
subicc.p gr4,#1,gr4,icc0
add gr6,gr5,gr6
bne icc0,#2,1b
DEBUG 'B'
bralr
.size __flush_tlb_all, .-__flush_tlb_all
###############################################################################
#
# flush everything to do with one context
# - void __flush_tlb_mm(unsigned long contextid [GR8])
#
###############################################################################
.globl __flush_tlb_mm
.type __flush_tlb_mm,@function
__flush_tlb_mm:
DEBUG 'M'
# kill cached PGE value
setlos #0xffffffff,gr4
movgs gr4,scr0
movgs gr4,scr1
# specify the context we want to flush
movgs gr8,tplr
# find out how many lines there are
movsg tpxr,gr5
sethi.p %hi(__tlb_lmax_sizes),gr4
srli gr5,#TPXR_LMAX_SHIFT,gr5
setlo.p %lo(__tlb_lmax_sizes),gr4
andi gr5,#TPXR_LMAX_SMASK,gr5
ldub @(gr4,gr5),gr4
# now, we assume that the TLB line step is page size in size
setlos.p #PAGE_SIZE,gr5
setlos #0,gr6
0:
tlbpr gr6,gr0,#5,#0
subicc.p gr4,#1,gr4,icc0
add gr6,gr5,gr6
bne icc0,#2,0b
DEBUG 'N'
bralr
.size __flush_tlb_mm, .-__flush_tlb_mm
###############################################################################
#
# flush a range of addresses from the TLB
# - void __flush_tlb_page(unsigned long contextid [GR8],
# unsigned long start [GR9])
#
###############################################################################
.globl __flush_tlb_page
.type __flush_tlb_page,@function
__flush_tlb_page:
# kill cached PGE value
setlos #0xffffffff,gr4
movgs gr4,scr0
movgs gr4,scr1
# specify the context we want to flush
movgs gr8,tplr
# zap the matching TLB line and AMR values
setlos #~(PAGE_SIZE-1),gr5
and gr9,gr5,gr9
tlbpr gr9,gr0,#5,#0
bralr
.size __flush_tlb_page, .-__flush_tlb_page
###############################################################################
#
# flush a range of addresses from the TLB
# - void __flush_tlb_range(unsigned long contextid [GR8],
# unsigned long start [GR9],
# unsigned long end [GR10])
#
###############################################################################
.globl __flush_tlb_range
.type __flush_tlb_range,@function
__flush_tlb_range:
# kill cached PGE value
setlos #0xffffffff,gr4
movgs gr4,scr0
movgs gr4,scr1
# specify the context we want to flush
movgs gr8,tplr
# round the start down to beginning of TLB line and end up to beginning of next TLB line
setlos.p #~(PAGE_SIZE-1),gr5
setlos #PAGE_SIZE,gr6
subi.p gr10,#1,gr10
and gr9,gr5,gr9
and gr10,gr5,gr10
2:
tlbpr gr9,gr0,#5,#0
subcc.p gr9,gr10,gr0,icc0
add gr9,gr6,gr9
bne icc0,#0,2b ; most likely a 1-page flush
bralr
.size __flush_tlb_range, .-__flush_tlb_range
