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gerrit-public.fairphone.software / kernel / msm-4.9 / c3e837bbcc03e39991da5dd1f791c06cde9f7a45 / . / arch / powerpc / kvm / book3s_hv_interrupts.S
blob: 3f7b674dd4bf4843ab37e649527149fd6143cf23 [file] [log] [blame]
Paul Mackerrasde56a942011-06-29 00:21:34 +0000[diff] [blame]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 */
Paul Mackerras9e368f22011-06-29 00:40:08 +0000[diff] [blame]53BEGIN_FTR_SECTION
Paul Mackerrasde56a942011-06-29 00:21:34 +0000[diff] [blame]54 mfspr r3, SPRN_DSCR
55 std r3, HSTATE_DSCR(r13)
Paul Mackerras9e368f22011-06-29 00:40:08 +0000[diff] [blame]56END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
Paul Mackerrasde56a942011-06-29 00:21:34 +0000[diff] [blame]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
Paul Mackerras9e368f22011-06-29 00:40:08 +0000[diff] [blame]91BEGIN_FTR_SECTION
92 mfspr r10, SPRN_PMC7
93 mfspr r11, SPRN_PMC8
94END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
Paul Mackerrasde56a942011-06-29 00:21:34 +0000[diff] [blame]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)
Paul Mackerras9e368f22011-06-29 00:40:08 +0000[diff] [blame]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)
Paul Mackerrasde56a942011-06-29 00:21:34 +0000[diff] [blame]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
Paul Mackerras9e368f22011-06-29 00:40:08 +0000[diff] [blame]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
Paul Mackerrasde56a942011-06-29 00:21:34 +0000[diff] [blame]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