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_44x(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_44x(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_44x(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