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 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> 16 * 17 * Derived from book3s_interrupts.S, which is: 18 * Copyright SUSE Linux Products GmbH 2009 19 * 20 * Authors: Alexander Graf <agraf@suse.de> 21 */ 22 23#include <asm/ppc_asm.h> 24#include <asm/kvm_asm.h> 25#include <asm/reg.h> 26#include <asm/page.h> 27#include <asm/asm-offsets.h> 28#include <asm/exception-64s.h> 29#include <asm/ppc-opcode.h> 30 31/***************************************************************************** 32 * * 33 * Guest entry / exit code that is in kernel module memory (vmalloc) * 34 * * 35 ****************************************************************************/ 36 37/* Registers: 38 * r4: vcpu pointer 39 */ 40_GLOBAL(__kvmppc_vcore_entry) 41 42 /* Write correct stack frame */ 43 mflr r0 44 std r0,PPC_LR_STKOFF(r1) 45 46 /* Save host state to the stack */ 47 stdu r1, -SWITCH_FRAME_SIZE(r1) 48 49 /* Save non-volatile registers (r14 - r31) */ 50 SAVE_NVGPRS(r1) 51 52 /* Save host DSCR */ 53BEGIN_FTR_SECTION 54 mfspr r3, SPRN_DSCR 55 std r3, HSTATE_DSCR(r13) 56END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) 57 58 /* Save host DABR */ 59 mfspr r3, SPRN_DABR 60 std r3, HSTATE_DABR(r13) 61 62 /* Hard-disable interrupts */ 63 mfmsr r10 64 std r10, HSTATE_HOST_MSR(r13) 65 rldicl r10,r10,48,1 66 rotldi r10,r10,16 67 mtmsrd r10,1 68 69 /* Save host PMU registers and load guest PMU registers */ 70 /* R4 is live here (vcpu pointer) but not r3 or r5 */ 71 li r3, 1 72 sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ 73 mfspr r7, SPRN_MMCR0 /* save MMCR0 */ 74 mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */ 75 isync 76 ld r3, PACALPPACAPTR(r13) /* is the host using the PMU? */ 77 lbz r5, LPPACA_PMCINUSE(r3) 78 cmpwi r5, 0 79 beq 31f /* skip if not */ 80 mfspr r5, SPRN_MMCR1 81 mfspr r6, SPRN_MMCRA 82 std r7, HSTATE_MMCR(r13) 83 std r5, HSTATE_MMCR + 8(r13) 84 std r6, HSTATE_MMCR + 16(r13) 85 mfspr r3, SPRN_PMC1 86 mfspr r5, SPRN_PMC2 87 mfspr r6, SPRN_PMC3 88 mfspr r7, SPRN_PMC4 89 mfspr r8, SPRN_PMC5 90 mfspr r9, SPRN_PMC6 91BEGIN_FTR_SECTION 92 mfspr r10, SPRN_PMC7 93 mfspr r11, SPRN_PMC8 94END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) 95 stw r3, HSTATE_PMC(r13) 96 stw r5, HSTATE_PMC + 4(r13) 97 stw r6, HSTATE_PMC + 8(r13) 98 stw r7, HSTATE_PMC + 12(r13) 99 stw r8, HSTATE_PMC + 16(r13) 100 stw r9, HSTATE_PMC + 20(r13) 101BEGIN_FTR_SECTION 102 stw r10, HSTATE_PMC + 24(r13) 103 stw r11, HSTATE_PMC + 28(r13) 104END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) 10531: 106 107 /* 108 * Put whatever is in the decrementer into the 109 * hypervisor decrementer. 110 */ 111 mfspr r8,SPRN_DEC 112 mftb r7 113 mtspr SPRN_HDEC,r8 114 extsw r8,r8 115 add r8,r8,r7 116 std r8,HSTATE_DECEXP(r13) 117 118 /* 119 * On PPC970, if the guest vcpu has an external interrupt pending, 120 * send ourselves an IPI so as to interrupt the guest once it 121 * enables interrupts. (It must have interrupts disabled, 122 * otherwise we would already have delivered the interrupt.) 123 */ 124BEGIN_FTR_SECTION 125 ld r0, VCPU_PENDING_EXC(r4) 126 li r7, (1 << BOOK3S_IRQPRIO_EXTERNAL) 127 oris r7, r7, (1 << BOOK3S_IRQPRIO_EXTERNAL_LEVEL)@h 128 and. r0, r0, r7 129 beq 32f 130 mr r31, r4 131 lhz r3, PACAPACAINDEX(r13) 132 bl smp_send_reschedule 133 nop 134 mr r4, r31 13532: 136END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) 137 138 /* Jump to partition switch code */ 139 bl .kvmppc_hv_entry_trampoline 140 nop 141 142/* 143 * We return here in virtual mode after the guest exits 144 * with something that we can't handle in real mode. 145 * Interrupts are enabled again at this point. 146 */ 147 148.global kvmppc_handler_highmem 149kvmppc_handler_highmem: 150 151 /* 152 * Register usage at this point: 153 * 154 * R1 = host R1 155 * R2 = host R2 156 * R12 = exit handler id 157 * R13 = PACA 158 */ 159 160 /* Restore non-volatile host registers (r14 - r31) */ 161 REST_NVGPRS(r1) 162 163 addi r1, r1, SWITCH_FRAME_SIZE 164 ld r0, PPC_LR_STKOFF(r1) 165 mtlr r0 166 blr 167