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#define SHADOW_SLB_ENTRY_LEN 0x10 21#define OFFSET_ESID(x) (SHADOW_SLB_ENTRY_LEN * x) 22#define OFFSET_VSID(x) ((SHADOW_SLB_ENTRY_LEN * x) + 8) 23 24/****************************************************************************** 25 * * 26 * Entry code * 27 * * 28 *****************************************************************************/ 29 30.macro LOAD_GUEST_SEGMENTS 31 32 /* Required state: 33 * 34 * MSR = ~IR|DR 35 * R13 = PACA 36 * R1 = host R1 37 * R2 = host R2 38 * R3 = shadow vcpu 39 * all other volatile GPRS = free except R4, R6 40 * SVCPU[CR] = guest CR 41 * SVCPU[XER] = guest XER 42 * SVCPU[CTR] = guest CTR 43 * SVCPU[LR] = guest LR 44 */ 45 46BEGIN_FW_FTR_SECTION 47 48 /* Declare SLB shadow as 0 entries big */ 49 50 ld r11, PACA_SLBSHADOWPTR(r13) 51 li r8, 0 52 stb r8, 3(r11) 53 54END_FW_FTR_SECTION_IFSET(FW_FEATURE_LPAR) 55 56 /* Flush SLB */ 57 58 li r10, 0 59 slbmte r10, r10 60 slbia 61 62 /* Fill SLB with our shadow */ 63 64 lbz r12, SVCPU_SLB_MAX(r3) 65 mulli r12, r12, 16 66 addi r12, r12, SVCPU_SLB 67 add r12, r12, r3 68 69 /* for (r11 = kvm_slb; r11 < kvm_slb + kvm_slb_size; r11+=slb_entry) */ 70 li r11, SVCPU_SLB 71 add r11, r11, r3 72 73slb_loop_enter: 74 75 ld r10, 0(r11) 76 77 andis. r9, r10, SLB_ESID_V@h 78 beq slb_loop_enter_skip 79 80 ld r9, 8(r11) 81 slbmte r9, r10 82 83slb_loop_enter_skip: 84 addi r11, r11, 16 85 cmpd cr0, r11, r12 86 blt slb_loop_enter 87 88slb_do_enter: 89 90.endm 91 92/****************************************************************************** 93 * * 94 * Exit code * 95 * * 96 *****************************************************************************/ 97 98.macro LOAD_HOST_SEGMENTS 99 100 /* Register usage at this point: 101 * 102 * R1 = host R1 103 * R2 = host R2 104 * R12 = exit handler id 105 * R13 = shadow vcpu - SHADOW_VCPU_OFF [=PACA on PPC64] 106 * SVCPU.* = guest * 107 * SVCPU[CR] = guest CR 108 * SVCPU[XER] = guest XER 109 * SVCPU[CTR] = guest CTR 110 * SVCPU[LR] = guest LR 111 * 112 */ 113 114 /* Remove all SLB entries that are in use. */ 115 116 li r0, 0 117 slbmte r0, r0 118 slbia 119 120 /* Restore bolted entries from the shadow */ 121 122 ld r11, PACA_SLBSHADOWPTR(r13) 123 124BEGIN_FW_FTR_SECTION 125 126 /* Declare SLB shadow as SLB_NUM_BOLTED entries big */ 127 128 li r8, SLB_NUM_BOLTED 129 stb r8, 3(r11) 130 131END_FW_FTR_SECTION_IFSET(FW_FEATURE_LPAR) 132 133 /* Manually load all entries from shadow SLB */ 134 135 li r8, SLBSHADOW_SAVEAREA 136 li r7, SLBSHADOW_SAVEAREA + 8 137 138 .rept SLB_NUM_BOLTED 139 LDX_BE r10, r11, r8 140 cmpdi r10, 0 141 beq 1f 142 LDX_BE r9, r11, r7 143 slbmte r9, r10 1441: addi r7, r7, SHADOW_SLB_ENTRY_LEN 145 addi r8, r8, SHADOW_SLB_ENTRY_LEN 146 .endr 147 148 isync 149 sync 150 151slb_do_exit: 152 153.endm 154