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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 */ | |
53 | mfspr r3, SPRN_DSCR | |
54 | std r3, HSTATE_DSCR(r13) | |
55 | ||
56 | /* Save host DABR */ | |
57 | mfspr r3, SPRN_DABR | |
58 | std r3, HSTATE_DABR(r13) | |
59 | ||
60 | /* Hard-disable interrupts */ | |
61 | mfmsr r10 | |
62 | std r10, HSTATE_HOST_MSR(r13) | |
63 | rldicl r10,r10,48,1 | |
64 | rotldi r10,r10,16 | |
65 | mtmsrd r10,1 | |
66 | ||
67 | /* Save host PMU registers and load guest PMU registers */ | |
68 | /* R4 is live here (vcpu pointer) but not r3 or r5 */ | |
69 | li r3, 1 | |
70 | sldi r3, r3, 31 /* MMCR0_FC (freeze counters) bit */ | |
71 | mfspr r7, SPRN_MMCR0 /* save MMCR0 */ | |
72 | mtspr SPRN_MMCR0, r3 /* freeze all counters, disable interrupts */ | |
73 | isync | |
74 | ld r3, PACALPPACAPTR(r13) /* is the host using the PMU? */ | |
75 | lbz r5, LPPACA_PMCINUSE(r3) | |
76 | cmpwi r5, 0 | |
77 | beq 31f /* skip if not */ | |
78 | mfspr r5, SPRN_MMCR1 | |
79 | mfspr r6, SPRN_MMCRA | |
80 | std r7, HSTATE_MMCR(r13) | |
81 | std r5, HSTATE_MMCR + 8(r13) | |
82 | std r6, HSTATE_MMCR + 16(r13) | |
83 | mfspr r3, SPRN_PMC1 | |
84 | mfspr r5, SPRN_PMC2 | |
85 | mfspr r6, SPRN_PMC3 | |
86 | mfspr r7, SPRN_PMC4 | |
87 | mfspr r8, SPRN_PMC5 | |
88 | mfspr r9, SPRN_PMC6 | |
89 | stw r3, HSTATE_PMC(r13) | |
90 | stw r5, HSTATE_PMC + 4(r13) | |
91 | stw r6, HSTATE_PMC + 8(r13) | |
92 | stw r7, HSTATE_PMC + 12(r13) | |
93 | stw r8, HSTATE_PMC + 16(r13) | |
94 | stw r9, HSTATE_PMC + 20(r13) | |
95 | 31: | |
96 | ||
97 | /* | |
98 | * Put whatever is in the decrementer into the | |
99 | * hypervisor decrementer. | |
100 | */ | |
101 | mfspr r8,SPRN_DEC | |
102 | mftb r7 | |
103 | mtspr SPRN_HDEC,r8 | |
104 | extsw r8,r8 | |
105 | add r8,r8,r7 | |
106 | std r8,HSTATE_DECEXP(r13) | |
107 | ||
108 | /* Jump to partition switch code */ | |
109 | bl .kvmppc_hv_entry_trampoline | |
110 | nop | |
111 | ||
112 | /* | |
113 | * We return here in virtual mode after the guest exits | |
114 | * with something that we can't handle in real mode. | |
115 | * Interrupts are enabled again at this point. | |
116 | */ | |
117 | ||
118 | .global kvmppc_handler_highmem | |
119 | kvmppc_handler_highmem: | |
120 | ||
121 | /* | |
122 | * Register usage at this point: | |
123 | * | |
124 | * R1 = host R1 | |
125 | * R2 = host R2 | |
126 | * R12 = exit handler id | |
127 | * R13 = PACA | |
128 | */ | |
129 | ||
130 | /* Restore non-volatile host registers (r14 - r31) */ | |
131 | REST_NVGPRS(r1) | |
132 | ||
133 | addi r1, r1, SWITCH_FRAME_SIZE | |
134 | ld r0, PPC_LR_STKOFF(r1) | |
135 | mtlr r0 | |
136 | blr |