tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 IBM Corp. 2008
16 *
17 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
18 */
19
20#include <asm/kvm_ppc.h>
21#include <asm/dcr.h>
22#include <asm/dcr-regs.h>
23#include <asm/disassemble.h>
24#include <asm/kvm_44x.h>
25#include "timing.h"
26
27#include "booke.h"
28#include "44x_tlb.h"
29
30#define XOP_MFDCRX 259
31#define XOP_MFDCR 323
32#define XOP_MTDCRX 387
33#define XOP_MTDCR 451
34#define XOP_TLBSX 914
35#define XOP_ICCCI 966
36#define XOP_TLBWE 978
37
38static int emulate_mtdcr(struct kvm_vcpu *vcpu, int rs, int dcrn)
39{
40 /* emulate some access in kernel */
41 switch (dcrn) {
42 case DCRN_CPR0_CONFIG_ADDR:
43 vcpu->arch.cpr0_cfgaddr = kvmppc_get_gpr(vcpu, rs);
44 return EMULATE_DONE;
45 default:
46 vcpu->run->dcr.dcrn = dcrn;
47 vcpu->run->dcr.data = kvmppc_get_gpr(vcpu, rs);
48 vcpu->run->dcr.is_write = 1;
49 vcpu->arch.dcr_is_write = 1;
50 vcpu->arch.dcr_needed = 1;
51 kvmppc_account_exit(vcpu, DCR_EXITS);
52 return EMULATE_DO_DCR;
53 }
54}
55
56static int emulate_mfdcr(struct kvm_vcpu *vcpu, int rt, int dcrn)
57{
58 /* The guest may access CPR0 registers to determine the timebase
59 * frequency, and it must know the real host frequency because it
60 * can directly access the timebase registers.
61 *
62 * It would be possible to emulate those accesses in userspace,
63 * but userspace can really only figure out the end frequency.
64 * We could decompose that into the factors that compute it, but
65 * that's tricky math, and it's easier to just report the real
66 * CPR0 values.
67 */
68 switch (dcrn) {
69 case DCRN_CPR0_CONFIG_ADDR:
70 kvmppc_set_gpr(vcpu, rt, vcpu->arch.cpr0_cfgaddr);
71 break;
72 case DCRN_CPR0_CONFIG_DATA:
73 local_irq_disable();
74 mtdcr(DCRN_CPR0_CONFIG_ADDR,
75 vcpu->arch.cpr0_cfgaddr);
76 kvmppc_set_gpr(vcpu, rt,
77 mfdcr(DCRN_CPR0_CONFIG_DATA));
78 local_irq_enable();
79 break;
80 default:
81 vcpu->run->dcr.dcrn = dcrn;
82 vcpu->run->dcr.data = 0;
83 vcpu->run->dcr.is_write = 0;
84 vcpu->arch.dcr_is_write = 0;
85 vcpu->arch.io_gpr = rt;
86 vcpu->arch.dcr_needed = 1;
87 kvmppc_account_exit(vcpu, DCR_EXITS);
88 return EMULATE_DO_DCR;
89 }
90
91 return EMULATE_DONE;
92}
93
94int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
95 unsigned int inst, int *advance)
96{
97 int emulated = EMULATE_DONE;
98 int dcrn = get_dcrn(inst);
99 int ra = get_ra(inst);
100 int rb = get_rb(inst);
101 int rc = get_rc(inst);
102 int rs = get_rs(inst);
103 int rt = get_rt(inst);
104 int ws = get_ws(inst);
105
106 switch (get_op(inst)) {
107 case 31:
108 switch (get_xop(inst)) {
109
110 case XOP_MFDCR:
111 emulated = emulate_mfdcr(vcpu, rt, dcrn);
112 break;
113
114 case XOP_MFDCRX:
115 emulated = emulate_mfdcr(vcpu, rt,
116 kvmppc_get_gpr(vcpu, ra));
117 break;
118
119 case XOP_MTDCR:
120 emulated = emulate_mtdcr(vcpu, rs, dcrn);
121 break;
122
123 case XOP_MTDCRX:
124 emulated = emulate_mtdcr(vcpu, rs,
125 kvmppc_get_gpr(vcpu, ra));
126 break;
127
128 case XOP_TLBWE:
129 emulated = kvmppc_44x_emul_tlbwe(vcpu, ra, rs, ws);
130 break;
131
132 case XOP_TLBSX:
133 emulated = kvmppc_44x_emul_tlbsx(vcpu, rt, ra, rb, rc);
134 break;
135
136 case XOP_ICCCI:
137 break;
138
139 default:
140 emulated = EMULATE_FAIL;
141 }
142
143 break;
144
145 default:
146 emulated = EMULATE_FAIL;
147 }
148
149 if (emulated == EMULATE_FAIL)
150 emulated = kvmppc_booke_emulate_op(run, vcpu, inst, advance);
151
152 return emulated;
153}
154
155int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
156{
157 int emulated = EMULATE_DONE;
158
159 switch (sprn) {
160 case SPRN_PID:
161 kvmppc_set_pid(vcpu, spr_val); break;
162 case SPRN_MMUCR:
163 vcpu->arch.mmucr = spr_val; break;
164 case SPRN_CCR0:
165 vcpu->arch.ccr0 = spr_val; break;
166 case SPRN_CCR1:
167 vcpu->arch.ccr1 = spr_val; break;
168 default:
169 emulated = kvmppc_booke_emulate_mtspr(vcpu, sprn, spr_val);
170 }
171
172 return emulated;
173}
174
175int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
176{
177 int emulated = EMULATE_DONE;
178
179 switch (sprn) {
180 case SPRN_PID:
181 *spr_val = vcpu->arch.pid; break;
182 case SPRN_MMUCR:
183 *spr_val = vcpu->arch.mmucr; break;
184 case SPRN_CCR0:
185 *spr_val = vcpu->arch.ccr0; break;
186 case SPRN_CCR1:
187 *spr_val = vcpu->arch.ccr1; break;
188 default:
189 emulated = kvmppc_booke_emulate_mfspr(vcpu, sprn, spr_val);
190 }
191
192 return emulated;
193}
194