linux/arch/powerpc/mm/tlb_nohash_low.S
Benjamin Herrenschmidt d4e167da4c powerpc/mm: Make low level TLB flush ops on BookE take additional args
We need to pass down whether the page is direct or indirect and we'll
need to pass the page size to _tlbil_va and _tlbivax_bcast

We also add a new low level _tlbil_pid_noind() which does a TLB flush
by PID but avoids flushing indirect entries if possible

This implements those new prototypes but defines them with inlines
or macros so that no additional arguments are actually passed on current
processors.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-08-20 10:12:41 +10:00

197 lines
4.2 KiB
ArmAsm

/*
* This file contains low-level functions for performing various
* types of TLB invalidations on various processors with no hash
* table.
*
* This file implements the following functions for all no-hash
* processors. Some aren't implemented for some variants. Some
* are inline in tlbflush.h
*
* - tlbil_va
* - tlbil_pid
* - tlbil_all
* - tlbivax_bcast (not yet)
*
* Code mostly moved over from misc_32.S
*
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Partially rewritten by Cort Dougan (cort@cs.nmt.edu)
* Paul Mackerras, Kumar Gala and Benjamin Herrenschmidt.
*
* 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 <asm/reg.h>
#include <asm/page.h>
#include <asm/cputable.h>
#include <asm/mmu.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
#include <asm/processor.h>
#if defined(CONFIG_40x)
/*
* 40x implementation needs only tlbil_va
*/
_GLOBAL(__tlbil_va)
/* We run the search with interrupts disabled because we have to change
* the PID and I don't want to preempt when that happens.
*/
mfmsr r5
mfspr r6,SPRN_PID
wrteei 0
mtspr SPRN_PID,r4
tlbsx. r3, 0, r3
mtspr SPRN_PID,r6
wrtee r5
bne 1f
sync
/* There are only 64 TLB entries, so r3 < 64, which means bit 25 is
* clear. Since 25 is the V bit in the TLB_TAG, loading this value
* will invalidate the TLB entry. */
tlbwe r3, r3, TLB_TAG
isync
1: blr
#elif defined(CONFIG_8xx)
/*
* Nothing to do for 8xx, everything is inline
*/
#elif defined(CONFIG_44x)
/*
* 440 implementation uses tlbsx/we for tlbil_va and a full sweep
* of the TLB for everything else.
*/
_GLOBAL(__tlbil_va)
mfspr r5,SPRN_MMUCR
rlwimi r5,r4,0,24,31 /* Set TID */
/* We have to run the search with interrupts disabled, otherwise
* an interrupt which causes a TLB miss can clobber the MMUCR
* between the mtspr and the tlbsx.
*
* Critical and Machine Check interrupts take care of saving
* and restoring MMUCR, so only normal interrupts have to be
* taken care of.
*/
mfmsr r4
wrteei 0
mtspr SPRN_MMUCR,r5
tlbsx. r3, 0, r3
wrtee r4
bne 1f
sync
/* There are only 64 TLB entries, so r3 < 64,
* which means bit 22, is clear. Since 22 is
* the V bit in the TLB_PAGEID, loading this
* value will invalidate the TLB entry.
*/
tlbwe r3, r3, PPC44x_TLB_PAGEID
isync
1: blr
_GLOBAL(_tlbil_all)
_GLOBAL(_tlbil_pid)
li r3,0
sync
/* Load high watermark */
lis r4,tlb_44x_hwater@ha
lwz r5,tlb_44x_hwater@l(r4)
1: tlbwe r3,r3,PPC44x_TLB_PAGEID
addi r3,r3,1
cmpw 0,r3,r5
ble 1b
isync
blr
#elif defined(CONFIG_FSL_BOOKE)
/*
* FSL BookE implementations.
*
* Since feature sections are using _SECTION_ELSE we need
* to have the larger code path before the _SECTION_ELSE
*/
#define MMUCSR0_TLBFI (MMUCSR0_TLB0FI | MMUCSR0_TLB1FI | \
MMUCSR0_TLB2FI | MMUCSR0_TLB3FI)
/*
* Flush MMU TLB on the local processor
*/
_GLOBAL(_tlbil_all)
BEGIN_MMU_FTR_SECTION
li r3,(MMUCSR0_TLBFI)@l
mtspr SPRN_MMUCSR0, r3
1:
mfspr r3,SPRN_MMUCSR0
andi. r3,r3,MMUCSR0_TLBFI@l
bne 1b
MMU_FTR_SECTION_ELSE
PPC_TLBILX_ALL(0,0)
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX)
msync
isync
blr
_GLOBAL(_tlbil_pid)
BEGIN_MMU_FTR_SECTION
slwi r3,r3,16
mfmsr r10
wrteei 0
mfspr r4,SPRN_MAS6 /* save MAS6 */
mtspr SPRN_MAS6,r3
PPC_TLBILX_PID(0,0)
mtspr SPRN_MAS6,r4 /* restore MAS6 */
wrtee r10
MMU_FTR_SECTION_ELSE
li r3,(MMUCSR0_TLBFI)@l
mtspr SPRN_MMUCSR0, r3
1:
mfspr r3,SPRN_MMUCSR0
andi. r3,r3,MMUCSR0_TLBFI@l
bne 1b
ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_USE_TLBILX)
msync
isync
blr
/*
* Flush MMU TLB for a particular address, but only on the local processor
* (no broadcast)
*/
_GLOBAL(__tlbil_va)
mfmsr r10
wrteei 0
slwi r4,r4,16
ori r4,r4,(MAS6_ISIZE(BOOK3E_PAGESZ_4K))@l
mtspr SPRN_MAS6,r4 /* assume AS=0 for now */
BEGIN_MMU_FTR_SECTION
tlbsx 0,r3
mfspr r4,SPRN_MAS1 /* check valid */
andis. r3,r4,MAS1_VALID@h
beq 1f
rlwinm r4,r4,0,1,31
mtspr SPRN_MAS1,r4
tlbwe
MMU_FTR_SECTION_ELSE
PPC_TLBILX_VA(0,r3)
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX)
msync
isync
1: wrtee r10
blr
#else
#error Unsupported processor type !
#endif