LXR linux/arch/powerpc/kvm/book3s_32

   1/*
   2 * This program is free software; you can redistribute it and/or modify
   3 * it under the terms of the GNU General Public License, version 2, as
   4 * published by the Free Software Foundation.
   5 *
   6 * This program is distributed in the hope that it will be useful,
   7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 * GNU General Public License for more details.
  10 *
  11 * You should have received a copy of the GNU General Public License
  12 * along with this program; if not, write to the Free Software
  13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14 *
  15 * Copyright SUSE Linux Products GmbH 2009
  16 *
  17 * Authors: Alexander Graf <agraf@suse.de>
  18 */
  19
  20/******************************************************************************
  21 *                                                                            *
  22 *                               Entry code                                   *
  23 *                                                                            *
  24 *****************************************************************************/
  25
  26.macro LOAD_GUEST_SEGMENTS
  27
  28        /* Required state:
  29         *
  30         * MSR = ~IR|DR
  31         * R1 = host R1
  32         * R2 = host R2
  33         * R3 = shadow vcpu
  34         * all other volatile GPRS = free except R4, R6
  35         * SVCPU[CR]  = guest CR
  36         * SVCPU[XER] = guest XER
  37         * SVCPU[CTR] = guest CTR
  38         * SVCPU[LR]  = guest LR
  39         */
  40
  41#define XCHG_SR(n)      lwz     r9, (SVCPU_SR+(n*4))(r3);  \
  42                        mtsr    n, r9
  43
  44        XCHG_SR(0)
  45        XCHG_SR(1)
  46        XCHG_SR(2)
  47        XCHG_SR(3)
  48        XCHG_SR(4)
  49        XCHG_SR(5)
  50        XCHG_SR(6)
  51        XCHG_SR(7)
  52        XCHG_SR(8)
  53        XCHG_SR(9)
  54        XCHG_SR(10)
  55        XCHG_SR(11)
  56        XCHG_SR(12)
  57        XCHG_SR(13)
  58        XCHG_SR(14)
  59        XCHG_SR(15)
  60
  61        /* Clear BATs. */
  62
  63#define KVM_KILL_BAT(n, reg)            \
  64        mtspr   SPRN_IBAT##n##U,reg;    \
  65        mtspr   SPRN_IBAT##n##L,reg;    \
  66        mtspr   SPRN_DBAT##n##U,reg;    \
  67        mtspr   SPRN_DBAT##n##L,reg;    \
  68
  69        li      r9, 0
  70        KVM_KILL_BAT(0, r9)
  71        KVM_KILL_BAT(1, r9)
  72        KVM_KILL_BAT(2, r9)
  73        KVM_KILL_BAT(3, r9)
  74
  75.endm
  76
  77/******************************************************************************
  78 *                                                                            *
  79 *                               Exit code                                    *
  80 *                                                                            *
  81 *****************************************************************************/
  82
  83.macro LOAD_HOST_SEGMENTS
  84
  85        /* Register usage at this point:
  86         *
  87         * R1         = host R1
  88         * R2         = host R2
  89         * R12        = exit handler id
  90         * R13        = shadow vcpu - SHADOW_VCPU_OFF
  91         * SVCPU.*    = guest *
  92         * SVCPU[CR]  = guest CR
  93         * SVCPU[XER] = guest XER
  94         * SVCPU[CTR] = guest CTR
  95         * SVCPU[LR]  = guest LR
  96         *
  97         */
  98
  99        /* Restore BATs */
 100
 101        /* We only overwrite the upper part, so we only restoree
 102           the upper part. */
 103#define KVM_LOAD_BAT(n, reg, RA, RB)    \
 104        lwz     RA,(n*16)+0(reg);       \
 105        lwz     RB,(n*16)+4(reg);       \
 106        mtspr   SPRN_IBAT##n##U,RA;     \
 107        mtspr   SPRN_IBAT##n##L,RB;     \
 108        lwz     RA,(n*16)+8(reg);       \
 109        lwz     RB,(n*16)+12(reg);      \
 110        mtspr   SPRN_DBAT##n##U,RA;     \
 111        mtspr   SPRN_DBAT##n##L,RB;     \
 112
 113        lis     r9, BATS@ha
 114        addi    r9, r9, BATS@l
 115        tophys(r9, r9)
 116        KVM_LOAD_BAT(0, r9, r10, r11)
 117        KVM_LOAD_BAT(1, r9, r10, r11)
 118        KVM_LOAD_BAT(2, r9, r10, r11)
 119        KVM_LOAD_BAT(3, r9, r10, r11)
 120
 121        /* Restore Segment Registers */
 122
 123        /* 0xc - 0xf */
 124
 125        li      r0, 4
 126        mtctr   r0
 127        LOAD_REG_IMMEDIATE(r3, 0x20000000 | (0x111 * 0xc))
 128        lis     r4, 0xc000
 1293:      mtsrin  r3, r4
 130        addi    r3, r3, 0x111     /* increment VSID */
 131        addis   r4, r4, 0x1000    /* address of next segment */
 132        bdnz    3b
 133
 134        /* 0x0 - 0xb */
 135
 136        /* 'current->mm' needs to be in r4 */
 137        tophys(r4, r2)
 138        lwz     r4, MM(r4)
 139        tophys(r4, r4)
 140        /* This only clobbers r0, r3, r4 and r5 */
 141        bl      switch_mmu_context
 142
 143.endm
 144