blob: 7e06a6fc8d07cdf34c72801b74db507607aaa40f [file] [log] [blame]
Alexander Graf786f19d2010-04-16 00:11:34 +02001/*
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
Paul Mackerras02143942011-07-23 17:41:44 +100034 * all other volatile GPRS = free except R4, R6
Alexander Graf786f19d2010-04-16 00:11:34 +020035 * 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