arch/powerpc/mm/tlb_nohash_low.S

   1 /*
   2  * This file contains low-level functions for performing various
   3  * types of TLB invalidations on various processors with no hash
   4  * table.
   5  *
   6  * This file implements the following functions for all no-hash
   7  * processors. Some aren't implemented for some variants. Some
   8  * are inline in tlbflush.h
   9  *
  10  *      - tlbil_va
  11  *      - tlbil_pid
  12  *      - tlbil_all
  13  *      - tlbivax_bcast (not yet)
  14  *
  15  * Code mostly moved over from misc_32.S
  16  *
  17  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  18  *
  19  * Partially rewritten by Cort Dougan (cort@cs.nmt.edu)
  20  * Paul Mackerras, Kumar Gala and Benjamin Herrenschmidt.
  21  *
  22  * This program is free software; you can redistribute it and/or
  23  * modify it under the terms of the GNU General Public License
  24  * as published by the Free Software Foundation; either version
  25  * 2 of the License, or (at your option) any later version.
  26  *
  27  */
  28
  29 #include <asm/reg.h>
  30 #include <asm/page.h>
  31 #include <asm/cputable.h>
  32 #include <asm/mmu.h>
  33 #include <asm/ppc_asm.h>
  34 #include <asm/asm-offsets.h>
  35 #include <asm/processor.h>
  36
  37 #if defined(CONFIG_40x)
  38
  39 /*
  40  * 40x implementation needs only tlbil_va
  41  */
  42 _GLOBAL(_tlbil_va)
  43         /* We run the search with interrupts disabled because we have to change
  44          * the PID and I don't want to preempt when that happens.
  45          */
  46         mfmsr   r5
  47         mfspr   r6,SPRN_PID
  48         wrteei  0
  49         mtspr   SPRN_PID,r4
  50         tlbsx.  r3, 0, r3
  51         mtspr   SPRN_PID,r6
  52         wrtee   r5
  53         bne     1f
  54         sync
  55         /* There are only 64 TLB entries, so r3 < 64, which means bit 25 is
  56          * clear. Since 25 is the V bit in the TLB_TAG, loading this value
  57          * will invalidate the TLB entry. */
  58         tlbwe   r3, r3, TLB_TAG
  59         isync
  60 1:      blr
  61
  62 #elif defined(CONFIG_8xx)
  63
  64 /*
  65  * Nothing to do for 8xx, everything is inline
  66  */
  67
  68 #elif defined(CONFIG_44x)
  69
  70 /*
  71  * 440 implementation uses tlbsx/we for tlbil_va and a full sweep
  72  * of the TLB for everything else.
  73  */
  74 _GLOBAL(_tlbil_va)
  75         mfspr   r5,SPRN_MMUCR
  76         rlwimi  r5,r4,0,24,31                   /* Set TID */
  77
  78         /* We have to run the search with interrupts disabled, otherwise
  79          * an interrupt which causes a TLB miss can clobber the MMUCR
  80          * between the mtspr and the tlbsx.
  81          *
  82          * Critical and Machine Check interrupts take care of saving
  83          * and restoring MMUCR, so only normal interrupts have to be
  84          * taken care of.
  85          */
  86         mfmsr   r4
  87         wrteei  0
  88         mtspr   SPRN_MMUCR,r5
  89         tlbsx.  r3, 0, r3
  90         wrtee   r4
  91         bne     1f
  92         sync
  93         /* There are only 64 TLB entries, so r3 < 64,
  94          * which means bit 22, is clear.  Since 22 is
  95          * the V bit in the TLB_PAGEID, loading this
  96          * value will invalidate the TLB entry.
  97          */
  98         tlbwe   r3, r3, PPC44x_TLB_PAGEID
  99         isync
 100 1:      blr
 101
 102 _GLOBAL(_tlbil_all)
 103 _GLOBAL(_tlbil_pid)
 104         li      r3,0
 105         sync
 106
 107         /* Load high watermark */
 108         lis     r4,tlb_44x_hwater@ha
 109         lwz     r5,tlb_44x_hwater@l(r4)
 110
 111 1:      tlbwe   r3,r3,PPC44x_TLB_PAGEID
 112         addi    r3,r3,1
 113         cmpw    0,r3,r5
 114         ble     1b
 115
 116         isync
 117         blr
 118
 119 #elif defined(CONFIG_FSL_BOOKE)
 120 /*
 121  * FSL BookE implementations. Currently _pid and _all are the
 122  * same. This will change when tlbilx is actually supported and
 123  * performs invalidate-by-PID. This change will be driven by
 124  * mmu_features conditional
 125  */
 126
 127 /*
 128  * Flush MMU TLB on the local processor
 129  */
 130 _GLOBAL(_tlbil_pid)
 131 _GLOBAL(_tlbil_all)
 132 #define MMUCSR0_TLBFI   (MMUCSR0_TLB0FI | MMUCSR0_TLB1FI | \
 133                          MMUCSR0_TLB2FI | MMUCSR0_TLB3FI)
 134         li      r3,(MMUCSR0_TLBFI)@l
 135         mtspr   SPRN_MMUCSR0, r3
 136 1:
 137         mfspr   r3,SPRN_MMUCSR0
 138         andi.   r3,r3,MMUCSR0_TLBFI@l
 139         bne     1b
 140         msync
 141         isync
 142         blr
 143
 144 /*
 145  * Flush MMU TLB for a particular address, but only on the local processor
 146  * (no broadcast)
 147  */
 148 _GLOBAL(_tlbil_va)
 149         mfmsr   r10
 150         wrteei  0
 151         slwi    r4,r4,16
 152         mtspr   SPRN_MAS6,r4            /* assume AS=0 for now */
 153         tlbsx   0,r3
 154         mfspr   r4,SPRN_MAS1            /* check valid */
 155         andis.  r3,r4,MAS1_VALID@h
 156         beq     1f
 157         rlwinm  r4,r4,0,1,31
 158         mtspr   SPRN_MAS1,r4
 159         tlbwe
 160         msync
 161         isync
 162 1:      wrtee   r10
 163         blr
 164 #elif
 165 #error Unsupported processor type !
 166 #endif