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);