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.
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.
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.
15 * Copyright IBM Corp. 2008
17 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
20 #include <asm/kvm_ppc.h>
22 #include <asm/dcr-regs.h>
23 #include <asm/disassemble.h>
24 #include <asm/kvm_44x.h>
36 int kvmppc_core_emulate_op(struct kvm_run
*run
, struct kvm_vcpu
*vcpu
,
37 unsigned int inst
, int *advance
)
39 int emulated
= EMULATE_DONE
;
40 int dcrn
= get_dcrn(inst
);
41 int ra
= get_ra(inst
);
42 int rb
= get_rb(inst
);
43 int rc
= get_rc(inst
);
44 int rs
= get_rs(inst
);
45 int rt
= get_rt(inst
);
46 int ws
= get_ws(inst
);
48 switch (get_op(inst
)) {
50 switch (get_xop(inst
)) {
53 /* The guest may access CPR0 registers to determine the timebase
54 * frequency, and it must know the real host frequency because it
55 * can directly access the timebase registers.
57 * It would be possible to emulate those accesses in userspace,
58 * but userspace can really only figure out the end frequency.
59 * We could decompose that into the factors that compute it, but
60 * that's tricky math, and it's easier to just report the real
64 case DCRN_CPR0_CONFIG_ADDR
:
65 kvmppc_set_gpr(vcpu
, rt
, vcpu
->arch
.cpr0_cfgaddr
);
67 case DCRN_CPR0_CONFIG_DATA
:
69 mtdcr(DCRN_CPR0_CONFIG_ADDR
,
70 vcpu
->arch
.cpr0_cfgaddr
);
71 kvmppc_set_gpr(vcpu
, rt
,
72 mfdcr(DCRN_CPR0_CONFIG_DATA
));
78 run
->dcr
.is_write
= 0;
79 vcpu
->arch
.io_gpr
= rt
;
80 vcpu
->arch
.dcr_needed
= 1;
81 kvmppc_account_exit(vcpu
, DCR_EXITS
);
82 emulated
= EMULATE_DO_DCR
;
88 /* emulate some access in kernel */
90 case DCRN_CPR0_CONFIG_ADDR
:
91 vcpu
->arch
.cpr0_cfgaddr
= kvmppc_get_gpr(vcpu
, rs
);
95 run
->dcr
.data
= kvmppc_get_gpr(vcpu
, rs
);
96 run
->dcr
.is_write
= 1;
97 vcpu
->arch
.dcr_needed
= 1;
98 kvmppc_account_exit(vcpu
, DCR_EXITS
);
99 emulated
= EMULATE_DO_DCR
;
105 emulated
= kvmppc_44x_emul_tlbwe(vcpu
, ra
, rs
, ws
);
109 emulated
= kvmppc_44x_emul_tlbsx(vcpu
, rt
, ra
, rb
, rc
);
116 emulated
= EMULATE_FAIL
;
122 emulated
= EMULATE_FAIL
;
125 if (emulated
== EMULATE_FAIL
)
126 emulated
= kvmppc_booke_emulate_op(run
, vcpu
, inst
, advance
);
131 int kvmppc_core_emulate_mtspr(struct kvm_vcpu
*vcpu
, int sprn
, ulong spr_val
)
133 int emulated
= EMULATE_DONE
;
137 kvmppc_set_pid(vcpu
, spr_val
); break;
139 vcpu
->arch
.mmucr
= spr_val
; break;
141 vcpu
->arch
.ccr0
= spr_val
; break;
143 vcpu
->arch
.ccr1
= spr_val
; break;
145 emulated
= kvmppc_booke_emulate_mtspr(vcpu
, sprn
, spr_val
);
151 int kvmppc_core_emulate_mfspr(struct kvm_vcpu
*vcpu
, int sprn
, ulong
*spr_val
)
153 int emulated
= EMULATE_DONE
;
157 *spr_val
= vcpu
->arch
.pid
; break;
159 *spr_val
= vcpu
->arch
.mmucr
; break;
161 *spr_val
= vcpu
->arch
.ccr0
; break;
163 *spr_val
= vcpu
->arch
.ccr1
; break;
165 emulated
= kvmppc_booke_emulate_mfspr(vcpu
, sprn
, spr_val
);