274 lines
5.6 KiB
ArmAsm
274 lines
5.6 KiB
ArmAsm
/*
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* This file contains low-level functions for performing various
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* types of TLB invalidations on various processors with no hash
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* table.
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*
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* This file implements the following functions for all no-hash
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* processors. Some aren't implemented for some variants. Some
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* are inline in tlbflush.h
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*
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* - tlbil_va
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* - tlbil_pid
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* - tlbil_all
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* - tlbivax_bcast (not yet)
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*
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* Code mostly moved over from misc_32.S
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*
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Partially rewritten by Cort Dougan (cort@cs.nmt.edu)
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* Paul Mackerras, Kumar Gala and Benjamin Herrenschmidt.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <asm/reg.h>
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#include <asm/page.h>
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#include <asm/cputable.h>
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#include <asm/mmu.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/processor.h>
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#if defined(CONFIG_40x)
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/*
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* 40x implementation needs only tlbil_va
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*/
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_GLOBAL(__tlbil_va)
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/* We run the search with interrupts disabled because we have to change
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* the PID and I don't want to preempt when that happens.
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*/
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mfmsr r5
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mfspr r6,SPRN_PID
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wrteei 0
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mtspr SPRN_PID,r4
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tlbsx. r3, 0, r3
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mtspr SPRN_PID,r6
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wrtee r5
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bne 1f
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sync
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/* There are only 64 TLB entries, so r3 < 64, which means bit 25 is
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* clear. Since 25 is the V bit in the TLB_TAG, loading this value
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* will invalidate the TLB entry. */
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tlbwe r3, r3, TLB_TAG
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isync
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1: blr
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#elif defined(CONFIG_8xx)
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/*
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* Nothing to do for 8xx, everything is inline
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*/
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#elif defined(CONFIG_44x)
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/*
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* 440 implementation uses tlbsx/we for tlbil_va and a full sweep
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* of the TLB for everything else.
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*/
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_GLOBAL(__tlbil_va)
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mfspr r5,SPRN_MMUCR
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rlwimi r5,r4,0,24,31 /* Set TID */
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/* We have to run the search with interrupts disabled, otherwise
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* an interrupt which causes a TLB miss can clobber the MMUCR
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* between the mtspr and the tlbsx.
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*
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* Critical and Machine Check interrupts take care of saving
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* and restoring MMUCR, so only normal interrupts have to be
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* taken care of.
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*/
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mfmsr r4
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wrteei 0
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mtspr SPRN_MMUCR,r5
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tlbsx. r3, 0, r3
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wrtee r4
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bne 1f
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sync
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/* There are only 64 TLB entries, so r3 < 64,
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* which means bit 22, is clear. Since 22 is
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* the V bit in the TLB_PAGEID, loading this
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* value will invalidate the TLB entry.
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*/
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tlbwe r3, r3, PPC44x_TLB_PAGEID
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isync
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1: blr
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_GLOBAL(_tlbil_all)
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_GLOBAL(_tlbil_pid)
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li r3,0
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sync
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/* Load high watermark */
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lis r4,tlb_44x_hwater@ha
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lwz r5,tlb_44x_hwater@l(r4)
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1: tlbwe r3,r3,PPC44x_TLB_PAGEID
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addi r3,r3,1
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cmpw 0,r3,r5
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ble 1b
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isync
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blr
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#elif defined(CONFIG_FSL_BOOKE)
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/*
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* FSL BookE implementations.
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*
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* Since feature sections are using _SECTION_ELSE we need
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* to have the larger code path before the _SECTION_ELSE
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*/
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/*
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* Flush MMU TLB on the local processor
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*/
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_GLOBAL(_tlbil_all)
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BEGIN_MMU_FTR_SECTION
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li r3,(MMUCSR0_TLBFI)@l
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mtspr SPRN_MMUCSR0, r3
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1:
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mfspr r3,SPRN_MMUCSR0
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andi. r3,r3,MMUCSR0_TLBFI@l
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bne 1b
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MMU_FTR_SECTION_ELSE
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PPC_TLBILX_ALL(0,0)
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ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX)
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msync
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isync
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blr
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_GLOBAL(_tlbil_pid)
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BEGIN_MMU_FTR_SECTION
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slwi r3,r3,16
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mfmsr r10
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wrteei 0
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mfspr r4,SPRN_MAS6 /* save MAS6 */
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mtspr SPRN_MAS6,r3
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PPC_TLBILX_PID(0,0)
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mtspr SPRN_MAS6,r4 /* restore MAS6 */
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wrtee r10
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MMU_FTR_SECTION_ELSE
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li r3,(MMUCSR0_TLBFI)@l
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mtspr SPRN_MMUCSR0, r3
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1:
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mfspr r3,SPRN_MMUCSR0
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andi. r3,r3,MMUCSR0_TLBFI@l
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bne 1b
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ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_USE_TLBILX)
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msync
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isync
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blr
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/*
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* Flush MMU TLB for a particular address, but only on the local processor
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* (no broadcast)
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*/
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_GLOBAL(__tlbil_va)
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mfmsr r10
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wrteei 0
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slwi r4,r4,16
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ori r4,r4,(MAS6_ISIZE(BOOK3E_PAGESZ_4K))@l
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mtspr SPRN_MAS6,r4 /* assume AS=0 for now */
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BEGIN_MMU_FTR_SECTION
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tlbsx 0,r3
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mfspr r4,SPRN_MAS1 /* check valid */
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andis. r3,r4,MAS1_VALID@h
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beq 1f
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rlwinm r4,r4,0,1,31
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mtspr SPRN_MAS1,r4
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tlbwe
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MMU_FTR_SECTION_ELSE
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PPC_TLBILX_VA(0,r3)
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ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX)
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msync
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isync
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1: wrtee r10
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blr
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#elif defined(CONFIG_PPC_BOOK3E)
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/*
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* New Book3E (>= 2.06) implementation
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*
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* Note: We may be able to get away without the interrupt masking stuff
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* if we save/restore MAS6 on exceptions that might modify it
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*/
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_GLOBAL(_tlbil_pid)
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slwi r4,r3,MAS6_SPID_SHIFT
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mfmsr r10
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wrteei 0
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mtspr SPRN_MAS6,r4
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PPC_TLBILX_PID(0,0)
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wrtee r10
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msync
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isync
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blr
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_GLOBAL(_tlbil_pid_noind)
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slwi r4,r3,MAS6_SPID_SHIFT
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mfmsr r10
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ori r4,r4,MAS6_SIND
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wrteei 0
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mtspr SPRN_MAS6,r4
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PPC_TLBILX_PID(0,0)
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wrtee r10
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msync
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isync
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blr
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_GLOBAL(_tlbil_all)
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PPC_TLBILX_ALL(0,0)
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msync
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isync
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blr
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_GLOBAL(_tlbil_va)
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mfmsr r10
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wrteei 0
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cmpwi cr0,r6,0
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slwi r4,r4,MAS6_SPID_SHIFT
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rlwimi r4,r5,MAS6_ISIZE_SHIFT,MAS6_ISIZE_MASK
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beq 1f
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rlwimi r4,r6,MAS6_SIND_SHIFT,MAS6_SIND
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1: mtspr SPRN_MAS6,r4 /* assume AS=0 for now */
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PPC_TLBILX_VA(0,r3)
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msync
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isync
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wrtee r10
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blr
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_GLOBAL(_tlbivax_bcast)
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mfmsr r10
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wrteei 0
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cmpwi cr0,r6,0
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slwi r4,r4,MAS6_SPID_SHIFT
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rlwimi r4,r5,MAS6_ISIZE_SHIFT,MAS6_ISIZE_MASK
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beq 1f
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rlwimi r4,r6,MAS6_SIND_SHIFT,MAS6_SIND
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1: mtspr SPRN_MAS6,r4 /* assume AS=0 for now */
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PPC_TLBIVAX(0,r3)
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eieio
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tlbsync
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sync
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wrtee r10
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blr
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_GLOBAL(set_context)
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#ifdef CONFIG_BDI_SWITCH
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/* Context switch the PTE pointer for the Abatron BDI2000.
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* The PGDIR is the second parameter.
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*/
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lis r5, abatron_pteptrs@h
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ori r5, r5, abatron_pteptrs@l
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stw r4, 0x4(r5)
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#endif
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mtspr SPRN_PID,r3
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isync /* Force context change */
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blr
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#else
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#error Unsupported processor type !
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#endif
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