1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
185 lines
4.3 KiB
ArmAsm
185 lines
4.3 KiB
ArmAsm
/* 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/config.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
|