[deliverable/linux.git] / arch / powerpc / kvm / 44x_emulate.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright IBM Corp. 2008
 *
 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 */

#include <asm/kvm_ppc.h>
#include <asm/dcr.h>
#include <asm/dcr-regs.h>
#include <asm/disassemble.h>
#include <asm/kvm_44x.h>
#include "timing.h"

#include "booke.h"
#include "44x_tlb.h"

#define XOP_MFDCRX  259
#define XOP_MFDCR   323
#define XOP_MTDCRX  387
#define XOP_MTDCR   451
#define XOP_TLBSX   914
#define XOP_ICCCI   966
#define XOP_TLBWE   978

static int emulate_mtdcr(struct kvm_vcpu *vcpu, int rs, int dcrn)
{
	/* emulate some access in kernel */
	switch (dcrn) {
	case DCRN_CPR0_CONFIG_ADDR:
		vcpu->arch.cpr0_cfgaddr = kvmppc_get_gpr(vcpu, rs);
		return EMULATE_DONE;
	default:
		vcpu->run->dcr.dcrn = dcrn;
		vcpu->run->dcr.data = kvmppc_get_gpr(vcpu, rs);
		vcpu->run->dcr.is_write = 1;
		vcpu->arch.dcr_is_write = 1;
		vcpu->arch.dcr_needed = 1;
		kvmppc_account_exit(vcpu, DCR_EXITS);
		return EMULATE_DO_DCR;
	}
}

static int emulate_mfdcr(struct kvm_vcpu *vcpu, int rt, int dcrn)
{
	/* The guest may access CPR0 registers to determine the timebase
	 * frequency, and it must know the real host frequency because it
	 * can directly access the timebase registers.
	 *
	 * It would be possible to emulate those accesses in userspace,
	 * but userspace can really only figure out the end frequency.
	 * We could decompose that into the factors that compute it, but
	 * that's tricky math, and it's easier to just report the real
	 * CPR0 values.
	 */
	switch (dcrn) {
	case DCRN_CPR0_CONFIG_ADDR:
		kvmppc_set_gpr(vcpu, rt, vcpu->arch.cpr0_cfgaddr);
		break;
	case DCRN_CPR0_CONFIG_DATA:
		local_irq_disable();
		mtdcr(DCRN_CPR0_CONFIG_ADDR,
			  vcpu->arch.cpr0_cfgaddr);
		kvmppc_set_gpr(vcpu, rt,
			       mfdcr(DCRN_CPR0_CONFIG_DATA));
		local_irq_enable();
		break;
	default:
		vcpu->run->dcr.dcrn = dcrn;
		vcpu->run->dcr.data =  0;
		vcpu->run->dcr.is_write = 0;
		vcpu->arch.dcr_is_write = 0;
		vcpu->arch.io_gpr = rt;
		vcpu->arch.dcr_needed = 1;
		kvmppc_account_exit(vcpu, DCR_EXITS);
		return EMULATE_DO_DCR;
	}

	return EMULATE_DONE;
}

int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
                           unsigned int inst, int *advance)
{
	int emulated = EMULATE_DONE;
	int dcrn = get_dcrn(inst);
	int ra = get_ra(inst);
	int rb = get_rb(inst);
	int rc = get_rc(inst);
	int rs = get_rs(inst);
	int rt = get_rt(inst);
	int ws = get_ws(inst);

	switch (get_op(inst)) {
	case 31:
		switch (get_xop(inst)) {

		case XOP_MFDCR:
			emulated = emulate_mfdcr(vcpu, rt, dcrn);
			break;

		case XOP_MFDCRX:
			emulated = emulate_mfdcr(vcpu, rt,
					kvmppc_get_gpr(vcpu, ra));
			break;

		case XOP_MTDCR:
			emulated = emulate_mtdcr(vcpu, rs, dcrn);
			break;

		case XOP_MTDCRX:
			emulated = emulate_mtdcr(vcpu, rs,
					kvmppc_get_gpr(vcpu, ra));
			break;

		case XOP_TLBWE:
			emulated = kvmppc_44x_emul_tlbwe(vcpu, ra, rs, ws);
			break;

		case XOP_TLBSX:
			emulated = kvmppc_44x_emul_tlbsx(vcpu, rt, ra, rb, rc);
			break;

		case XOP_ICCCI:
			break;

		default:
			emulated = EMULATE_FAIL;
		}

		break;

	default:
		emulated = EMULATE_FAIL;
	}

	if (emulated == EMULATE_FAIL)
		emulated = kvmppc_booke_emulate_op(run, vcpu, inst, advance);

	return emulated;
}

int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
{
	int emulated = EMULATE_DONE;

	switch (sprn) {
	case SPRN_PID:
		kvmppc_set_pid(vcpu, spr_val); break;
	case SPRN_MMUCR:
		vcpu->arch.mmucr = spr_val; break;
	case SPRN_CCR0:
		vcpu->arch.ccr0 = spr_val; break;
	case SPRN_CCR1:
		vcpu->arch.ccr1 = spr_val; break;
	default:
		emulated = kvmppc_booke_emulate_mtspr(vcpu, sprn, spr_val);
	}

	return emulated;
}

int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
{
	int emulated = EMULATE_DONE;

	switch (sprn) {
	case SPRN_PID:
		*spr_val = vcpu->arch.pid; break;
	case SPRN_MMUCR:
		*spr_val = vcpu->arch.mmucr; break;
	case SPRN_CCR0:
		*spr_val = vcpu->arch.ccr0; break;
	case SPRN_CCR1:
		*spr_val = vcpu->arch.ccr1; break;
	default:
		emulated = kvmppc_booke_emulate_mfspr(vcpu, sprn, spr_val);
	}

	return emulated;
}
Commit	Line	Data
75f74f0d HB	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>
fe4e771d	24	#include <asm/kvm_44x.h>
73e75b41	25	#include "timing.h"
75f74f0d HB	26
	27	#include "booke.h"
	28	#include "44x_tlb.h"
	29
ceb985f9	30	#define XOP_MFDCRX 259
75f74f0d	31	#define XOP_MFDCR 323
e4dcfe88	32	#define XOP_MTDCRX 387
75f74f0d HB	33	#define XOP_MTDCR 451
	34	#define XOP_TLBSX 914
	35	#define XOP_ICCCI 966
	36	#define XOP_TLBWE 978
	37
e4dcfe88 AG	38	static 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;
e43a0287	49	vcpu->arch.dcr_is_write = 1;
e4dcfe88 AG	50	vcpu->arch.dcr_needed = 1;
	51	kvmppc_account_exit(vcpu, DCR_EXITS);
	52	return EMULATE_DO_DCR;
	53	}
	54	}
	55
ceb985f9 AG	56	static 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;
e43a0287	84	vcpu->arch.dcr_is_write = 0;
ceb985f9 AG	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
75f74f0d HB	94	int kvmppc_core_emulate_op(struct kvm_run run, struct kvm_vcpu vcpu,
	95	unsigned int inst, int *advance)
	96	{
	97	int emulated = EMULATE_DONE;
c46dc9a8 AG	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);
75f74f0d HB	105
75f74f0d HB	106	switch (get_op(inst)) {
75f74f0d HB	107	case 31:
	108	switch (get_xop(inst)) {
	109
75f74f0d	110	case XOP_MFDCR:
ceb985f9 AG	111	emulated = emulate_mfdcr(vcpu, rt, dcrn);
ceb985f9 AG	112	break;
75f74f0d	113
ceb985f9 AG	114	case XOP_MFDCRX:
	115	emulated = emulate_mfdcr(vcpu, rt,
	116	kvmppc_get_gpr(vcpu, ra));
75f74f0d HB	117	break;
	118
	119	case XOP_MTDCR:
e4dcfe88 AG	120	emulated = emulate_mtdcr(vcpu, rs, dcrn);
e4dcfe88 AG	121	break;
75f74f0d	122
e4dcfe88 AG	123	case XOP_MTDCRX:
	124	emulated = emulate_mtdcr(vcpu, rs,
	125	kvmppc_get_gpr(vcpu, ra));
75f74f0d HB	126	break;
	127
	128	case XOP_TLBWE:
75f74f0d HB	129	emulated = kvmppc_44x_emul_tlbwe(vcpu, ra, rs, ws);
	130	break;
	131
	132	case XOP_TLBSX:
75f74f0d HB	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
d0c7dc03 HB	149	if (emulated == EMULATE_FAIL)
	150	emulated = kvmppc_booke_emulate_op(run, vcpu, inst, advance);
	151
75f74f0d HB	152	return emulated;
	153	}
	154
54771e62	155	int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
75f74f0d	156	{
d0c7dc03 HB	157	int emulated = EMULATE_DONE;
d0c7dc03 HB	158
75f74f0d	159	switch (sprn) {
75f74f0d	160	case SPRN_PID:
54771e62	161	kvmppc_set_pid(vcpu, spr_val); break;
d0c7dc03	162	case SPRN_MMUCR:
54771e62	163	vcpu->arch.mmucr = spr_val; break;
75f74f0d	164	case SPRN_CCR0:
54771e62	165	vcpu->arch.ccr0 = spr_val; break;
75f74f0d	166	case SPRN_CCR1:
54771e62	167	vcpu->arch.ccr1 = spr_val; break;
75f74f0d	168	default:
54771e62	169	emulated = kvmppc_booke_emulate_mtspr(vcpu, sprn, spr_val);
75f74f0d HB	170	}
75f74f0d HB	171
d0c7dc03	172	return emulated;
75f74f0d HB	173	}
75f74f0d HB	174
54771e62	175	int kvmppc_core_emulate_mfspr(struct kvm_vcpu vcpu, int sprn, ulong spr_val)
75f74f0d	176	{
d0c7dc03 HB	177	int emulated = EMULATE_DONE;
d0c7dc03 HB	178
75f74f0d	179	switch (sprn) {
d0c7dc03	180	case SPRN_PID:
54771e62	181	*spr_val = vcpu->arch.pid; break;
75f74f0d	182	case SPRN_MMUCR:
54771e62	183	*spr_val = vcpu->arch.mmucr; break;
75f74f0d	184	case SPRN_CCR0:
54771e62	185	*spr_val = vcpu->arch.ccr0; break;
75f74f0d	186	case SPRN_CCR1:
54771e62	187	*spr_val = vcpu->arch.ccr1; break;
75f74f0d	188	default:
54771e62	189	emulated = kvmppc_booke_emulate_mfspr(vcpu, sprn, spr_val);
75f74f0d HB	190	}
75f74f0d HB	191
d0c7dc03	192	return emulated;
75f74f0d HB	193	}
75f74f0d HB	194