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;
 41	int ra;
 42	int rb;
 43	int rc;
 44	int rs;
 45	int rt;
 46	int ws;
 47
 48	switch (get_op(inst)) {
 49	case 31:
 50		switch (get_xop(inst)) {
 51
 52		case XOP_MFDCR:
 53			dcrn = get_dcrn(inst);
 54			rt = get_rt(inst);
 55
 56			/* The guest may access CPR0 registers to determine the timebase
 57			 * frequency, and it must know the real host frequency because it
 58			 * can directly access the timebase registers.
 59			 *
 60			 * It would be possible to emulate those accesses in userspace,
 61			 * but userspace can really only figure out the end frequency.
 62			 * We could decompose that into the factors that compute it, but
 63			 * that's tricky math, and it's easier to just report the real
 64			 * CPR0 values.
 65			 */
 66			switch (dcrn) {
 67			case DCRN_CPR0_CONFIG_ADDR:
 68				kvmppc_set_gpr(vcpu, rt, vcpu->arch.cpr0_cfgaddr);
 69				break;
 70			case DCRN_CPR0_CONFIG_DATA:
 71				local_irq_disable();
 72				mtdcr(DCRN_CPR0_CONFIG_ADDR,
 73					  vcpu->arch.cpr0_cfgaddr);
 74				kvmppc_set_gpr(vcpu, rt,
 75					       mfdcr(DCRN_CPR0_CONFIG_DATA));
 76				local_irq_enable();
 77				break;
 78			default:
 79				run->dcr.dcrn = dcrn;
 80				run->dcr.data =  0;
 81				run->dcr.is_write = 0;
 82				vcpu->arch.io_gpr = rt;
 83				vcpu->arch.dcr_needed = 1;
 84				kvmppc_account_exit(vcpu, DCR_EXITS);
 85				emulated = EMULATE_DO_DCR;
 86			}
 87
 88			break;
 89
 90		case XOP_MTDCR:
 91			dcrn = get_dcrn(inst);
 92			rs = get_rs(inst);
 93
 94			/* emulate some access in kernel */
 95			switch (dcrn) {
 96			case DCRN_CPR0_CONFIG_ADDR:
 97				vcpu->arch.cpr0_cfgaddr = kvmppc_get_gpr(vcpu, rs);
 98				break;
 99			default:
100				run->dcr.dcrn = dcrn;
101				run->dcr.data = kvmppc_get_gpr(vcpu, rs);
102				run->dcr.is_write = 1;
103				vcpu->arch.dcr_needed = 1;
104				kvmppc_account_exit(vcpu, DCR_EXITS);
105				emulated = EMULATE_DO_DCR;
106			}
107
108			break;
109
110		case XOP_TLBWE:
111			ra = get_ra(inst);
112			rs = get_rs(inst);
113			ws = get_ws(inst);
114			emulated = kvmppc_44x_emul_tlbwe(vcpu, ra, rs, ws);
115			break;
116
117		case XOP_TLBSX:
118			rt = get_rt(inst);
119			ra = get_ra(inst);
120			rb = get_rb(inst);
121			rc = get_rc(inst);
122			emulated = kvmppc_44x_emul_tlbsx(vcpu, rt, ra, rb, rc);
123			break;
124
125		case XOP_ICCCI:
126			break;
127
128		default:
129			emulated = EMULATE_FAIL;
130		}
131
132		break;
133
134	default:
135		emulated = EMULATE_FAIL;
136	}
137
138	if (emulated == EMULATE_FAIL)
139		emulated = kvmppc_booke_emulate_op(run, vcpu, inst, advance);
140
141	return emulated;
142}
143
144int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
145{
146	int emulated = EMULATE_DONE;
147
148	switch (sprn) {
149	case SPRN_PID:
150		kvmppc_set_pid(vcpu, kvmppc_get_gpr(vcpu, rs)); break;
151	case SPRN_MMUCR:
152		vcpu->arch.mmucr = kvmppc_get_gpr(vcpu, rs); break;
153	case SPRN_CCR0:
154		vcpu->arch.ccr0 = kvmppc_get_gpr(vcpu, rs); break;
155	case SPRN_CCR1:
156		vcpu->arch.ccr1 = kvmppc_get_gpr(vcpu, rs); break;
157	default:
158		emulated = kvmppc_booke_emulate_mtspr(vcpu, sprn, rs);
159	}
160
161	return emulated;
162}
163
164int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
165{
166	int emulated = EMULATE_DONE;
167
168	switch (sprn) {
169	case SPRN_PID:
170		kvmppc_set_gpr(vcpu, rt, vcpu->arch.pid); break;
171	case SPRN_MMUCR:
172		kvmppc_set_gpr(vcpu, rt, vcpu->arch.mmucr); break;
173	case SPRN_CCR0:
174		kvmppc_set_gpr(vcpu, rt, vcpu->arch.ccr0); break;
175	case SPRN_CCR1:
176		kvmppc_set_gpr(vcpu, rt, vcpu->arch.ccr1); break;
177	default:
178		emulated = kvmppc_booke_emulate_mfspr(vcpu, sprn, rt);
179	}
180
181	return emulated;
182}
183