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 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