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_MFDCR   323
 31#define XOP_MTDCR   451
 32#define XOP_TLBSX   914
 33#define XOP_ICCCI   966
 34#define XOP_TLBWE   978
 35
 36int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
 37                           unsigned int inst, int *advance)
 38{
 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);
 47
 48	switch (get_op(inst)) {
 49	case 31:
 50		switch (get_xop(inst)) {
 51
 52		case XOP_MFDCR:
 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.
 56			 *
 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
 61			 * CPR0 values.
 62			 */
 63			switch (dcrn) {
 64			case DCRN_CPR0_CONFIG_ADDR:
 65				kvmppc_set_gpr(vcpu, rt, vcpu->arch.cpr0_cfgaddr);
 66				break;
 67			case DCRN_CPR0_CONFIG_DATA:
 68				local_irq_disable();
 69				mtdcr(DCRN_CPR0_CONFIG_ADDR,
 70					  vcpu->arch.cpr0_cfgaddr);
 71				kvmppc_set_gpr(vcpu, rt,
 72					       mfdcr(DCRN_CPR0_CONFIG_DATA));
 73				local_irq_enable();
 74				break;
 75			default:
 76				run->dcr.dcrn = dcrn;
 77				run->dcr.data =  0;
 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;
 83			}
 84
 85			break;
 86
 87		case XOP_MTDCR:
 88			/* emulate some access in kernel */
 89			switch (dcrn) {
 90			case DCRN_CPR0_CONFIG_ADDR:
 91				vcpu->arch.cpr0_cfgaddr = kvmppc_get_gpr(vcpu, rs);
 92				break;
 93			default:
 94				run->dcr.dcrn = dcrn;
 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;
100			}
101
102			break;
103
104		case XOP_TLBWE:
105			emulated = kvmppc_44x_emul_tlbwe(vcpu, ra, rs, ws);
106			break;
107
108		case XOP_TLBSX:
109			emulated = kvmppc_44x_emul_tlbsx(vcpu, rt, ra, rb, rc);
110			break;
111
112		case XOP_ICCCI:
113			break;
114
115		default:
116			emulated = EMULATE_FAIL;
117		}
118
119		break;
120
121	default:
122		emulated = EMULATE_FAIL;
123	}
124
125	if (emulated == EMULATE_FAIL)
126		emulated = kvmppc_booke_emulate_op(run, vcpu, inst, advance);
127
128	return emulated;
129}
130
131int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
132{
133	int emulated = EMULATE_DONE;
134
135	switch (sprn) {
136	case SPRN_PID:
137		kvmppc_set_pid(vcpu, spr_val); break;
138	case SPRN_MMUCR:
139		vcpu->arch.mmucr = spr_val; break;
140	case SPRN_CCR0:
141		vcpu->arch.ccr0 = spr_val; break;
142	case SPRN_CCR1:
143		vcpu->arch.ccr1 = spr_val; break;
144	default:
145		emulated = kvmppc_booke_emulate_mtspr(vcpu, sprn, spr_val);
146	}
147
148	return emulated;
149}
150
151int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
152{
153	int emulated = EMULATE_DONE;
154
155	switch (sprn) {
156	case SPRN_PID:
157		*spr_val = vcpu->arch.pid; break;
158	case SPRN_MMUCR:
159		*spr_val = vcpu->arch.mmucr; break;
160	case SPRN_CCR0:
161		*spr_val = vcpu->arch.ccr0; break;
162	case SPRN_CCR1:
163		*spr_val = vcpu->arch.ccr1; break;
164	default:
165		emulated = kvmppc_booke_emulate_mfspr(vcpu, sprn, spr_val);
166	}
167
168	return emulated;
169}
170