473 lines
9.6 KiB
ArmAsm
473 lines
9.6 KiB
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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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
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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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#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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#include <asm/bug.h>
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#include <asm/asm-compat.h>
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#include <asm/feature-fixups.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_PPC_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) /* Includes 47x */
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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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mfmsr r10
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/*
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* We write 16 bits of STID since 47x supports that much, we
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* will never be passed out of bounds values on 440 (hopefully)
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*/
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rlwimi r5,r4,0,16,31
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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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wrteei 0
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mtspr SPRN_MMUCR,r5
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tlbsx. r6,0,r3
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bne 10f
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sync
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#ifndef CONFIG_PPC_47x
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/* On 440 There are only 64 TLB entries, so r3 < 64, which means bit
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* 22, is clear. Since 22 is 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 r6,r6,PPC44x_TLB_PAGEID
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#else
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oris r7,r6,0x8000 /* specify way explicitly */
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clrrwi r4,r3,12 /* get an EPN for the hashing with V = 0 */
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ori r4,r4,PPC47x_TLBE_SIZE
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tlbwe r4,r7,0 /* write it */
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#endif /* !CONFIG_PPC_47x */
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isync
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10: wrtee r10
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blr
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_GLOBAL(_tlbil_all)
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_GLOBAL(_tlbil_pid)
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#ifndef CONFIG_PPC_47x
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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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#else
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/* 476 variant. There's not simple way to do this, hopefully we'll
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* try to limit the amount of such full invalidates
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*/
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mfmsr r11 /* Interrupts off */
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wrteei 0
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li r3,-1 /* Current set */
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lis r10,tlb_47x_boltmap@h
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ori r10,r10,tlb_47x_boltmap@l
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lis r7,0x8000 /* Specify way explicitly */
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b 9f /* For each set */
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1: li r9,4 /* Number of ways */
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li r4,0 /* Current way */
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li r6,0 /* Default entry value 0 */
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andi. r0,r8,1 /* Check if way 0 is bolted */
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mtctr r9 /* Load way counter */
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bne- 3f /* Bolted, skip loading it */
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2: /* For each way */
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or r5,r3,r4 /* Make way|index for tlbre */
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rlwimi r5,r5,16,8,15 /* Copy index into position */
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tlbre r6,r5,0 /* Read entry */
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3: addis r4,r4,0x2000 /* Next way */
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andi. r0,r6,PPC47x_TLB0_VALID /* Valid entry ? */
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beq 4f /* Nope, skip it */
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rlwimi r7,r5,0,1,2 /* Insert way number */
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rlwinm r6,r6,0,21,19 /* Clear V */
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tlbwe r6,r7,0 /* Write it */
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4: bdnz 2b /* Loop for each way */
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srwi r8,r8,1 /* Next boltmap bit */
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9: cmpwi cr1,r3,255 /* Last set done ? */
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addi r3,r3,1 /* Next set */
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beq cr1,1f /* End of loop */
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andi. r0,r3,0x1f /* Need to load a new boltmap word ? */
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bne 1b /* No, loop */
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lwz r8,0(r10) /* Load boltmap entry */
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addi r10,r10,4 /* Next word */
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b 1b /* Then loop */
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1: isync /* Sync shadows */
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wrtee r11
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blr
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#endif /* !CONFIG_PPC_47x */
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#ifdef CONFIG_PPC_47x
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/*
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* _tlbivax_bcast is only on 47x. We don't bother doing a runtime
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* check though, it will blow up soon enough if we mistakenly try
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* to use it on a 440.
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*/
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_GLOBAL(_tlbivax_bcast)
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mfspr r5,SPRN_MMUCR
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mfmsr r10
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rlwimi r5,r4,0,16,31
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wrteei 0
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mtspr SPRN_MMUCR,r5
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isync
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PPC_TLBIVAX(0, R3)
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isync
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mbar
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tlbsync
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BEGIN_FTR_SECTION
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b 1f
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END_FTR_SECTION_IFSET(CPU_FTR_476_DD2)
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sync
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wrtee r10
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blr
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/*
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* DD2 HW could hang if in instruction fetch happens before msync completes.
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* Touch enough instruction cache lines to ensure cache hits
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*/
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1: mflr r9
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bcl 20,31,$+4
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2: mflr r6
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li r7,32
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PPC_ICBT(0,R6,R7) /* touch next cache line */
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add r6,r6,r7
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PPC_ICBT(0,R6,R7) /* touch next cache line */
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add r6,r6,r7
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PPC_ICBT(0,R6,R7) /* touch next cache line */
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sync
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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mtlr r9
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wrtee r10
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blr
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#endif /* CONFIG_PPC_47x */
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#elif defined(CONFIG_PPC_85xx)
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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,R0)
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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,R0)
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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_64)
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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,R0)
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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,R0)
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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,R0)
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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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mbar
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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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#else
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#error Unsupported processor type !
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#endif
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#if defined(CONFIG_PPC_E500)
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/*
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* extern void loadcam_entry(unsigned int index)
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*
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* Load TLBCAM[index] entry in to the L2 CAM MMU
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* Must preserve r7, r8, r9, r10, r11, r12
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*/
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_GLOBAL(loadcam_entry)
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mflr r5
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LOAD_REG_ADDR_PIC(r4, TLBCAM)
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mtlr r5
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mulli r5,r3,TLBCAM_SIZE
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add r3,r5,r4
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lwz r4,TLBCAM_MAS0(r3)
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mtspr SPRN_MAS0,r4
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lwz r4,TLBCAM_MAS1(r3)
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mtspr SPRN_MAS1,r4
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PPC_LL r4,TLBCAM_MAS2(r3)
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mtspr SPRN_MAS2,r4
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lwz r4,TLBCAM_MAS3(r3)
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mtspr SPRN_MAS3,r4
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BEGIN_MMU_FTR_SECTION
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lwz r4,TLBCAM_MAS7(r3)
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mtspr SPRN_MAS7,r4
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END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS)
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isync
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tlbwe
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isync
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blr
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/*
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* Load multiple TLB entries at once, using an alternate-space
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* trampoline so that we don't have to care about whether the same
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* TLB entry maps us before and after.
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*
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* r3 = first entry to write
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* r4 = number of entries to write
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* r5 = temporary tlb entry (0 means no switch to AS1)
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*/
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_GLOBAL(loadcam_multi)
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mflr r8
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/* Don't switch to AS=1 if already there */
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mfmsr r11
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andi. r11,r11,MSR_IS
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bne 10f
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mr. r12, r5
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beq 10f
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/*
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* Set up temporary TLB entry that is the same as what we're
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* running from, but in AS=1.
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*/
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bcl 20,31,$+4
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1: mflr r6
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tlbsx 0,r8
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mfspr r6,SPRN_MAS1
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ori r6,r6,MAS1_TS
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mtspr SPRN_MAS1,r6
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mfspr r6,SPRN_MAS0
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rlwimi r6,r5,MAS0_ESEL_SHIFT,MAS0_ESEL_MASK
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mr r7,r5
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mtspr SPRN_MAS0,r6
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isync
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tlbwe
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isync
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/* Switch to AS=1 */
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mfmsr r6
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ori r6,r6,MSR_IS|MSR_DS
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mtmsr r6
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isync
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10:
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mr r9,r3
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add r10,r3,r4
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2: bl loadcam_entry
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addi r9,r9,1
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cmpw r9,r10
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mr r3,r9
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blt 2b
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/* Don't return to AS=0 if we were in AS=1 at function start */
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andi. r11,r11,MSR_IS
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bne 3f
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cmpwi r12, 0
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beq 3f
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/* Return to AS=0 and clear the temporary entry */
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mfmsr r6
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rlwinm. r6,r6,0,~(MSR_IS|MSR_DS)
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mtmsr r6
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isync
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li r6,0
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mtspr SPRN_MAS1,r6
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rlwinm r6,r7,MAS0_ESEL_SHIFT,MAS0_ESEL_MASK
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oris r6,r6,MAS0_TLBSEL(1)@h
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mtspr SPRN_MAS0,r6
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isync
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tlbwe
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isync
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3:
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mtlr r8
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blr
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#endif
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