/*
 * 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 <linux/kvm_host.h>
#include <asm/disassemble.h>

#include "booke.h"

#define OP_19_XOP_RFI     50

#define OP_31_XOP_MFMSR   83
#define OP_31_XOP_WRTEE   131
#define OP_31_XOP_MTMSR   146
#define OP_31_XOP_WRTEEI  163

static void kvmppc_emul_rfi(struct kvm_vcpu *vcpu)
{
	vcpu->arch.pc = vcpu->arch.srr0;
	kvmppc_set_msr(vcpu, vcpu->arch.srr1);
}

int kvmppc_booke_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
                            unsigned int inst, int *advance)
{
	int emulated = EMULATE_DONE;
	int rs;
	int rt;

	switch (get_op(inst)) {
	case 19:
		switch (get_xop(inst)) {
		case OP_19_XOP_RFI:
			kvmppc_emul_rfi(vcpu);
			kvmppc_set_exit_type(vcpu, EMULATED_RFI_EXITS);
			*advance = 0;
			break;

		default:
			emulated = EMULATE_FAIL;
			break;
		}
		break;

	case 31:
		switch (get_xop(inst)) {

		case OP_31_XOP_MFMSR:
			rt = get_rt(inst);
			vcpu->arch.gpr[rt] = vcpu->arch.msr;
			kvmppc_set_exit_type(vcpu, EMULATED_MFMSR_EXITS);
			break;

		case OP_31_XOP_MTMSR:
			rs = get_rs(inst);
			kvmppc_set_exit_type(vcpu, EMULATED_MTMSR_EXITS);
			kvmppc_set_msr(vcpu, vcpu->arch.gpr[rs]);
			break;

		case OP_31_XOP_WRTEE:
			rs = get_rs(inst);
			vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE)
							 | (vcpu->arch.gpr[rs] & MSR_EE);
			kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
			break;

		case OP_31_XOP_WRTEEI:
			vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE)
							 | (inst & MSR_EE);
			kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
			break;

		default:
			emulated = EMULATE_FAIL;
		}

		break;

	default:
		emulated = EMULATE_FAIL;
	}

	return emulated;
}

int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
{
	int emulated = EMULATE_DONE;

	switch (sprn) {
	case SPRN_DEAR:
		vcpu->arch.dear = vcpu->arch.gpr[rs]; break;
	case SPRN_ESR:
		vcpu->arch.esr = vcpu->arch.gpr[rs]; break;
	case SPRN_DBCR0:
		vcpu->arch.dbcr0 = vcpu->arch.gpr[rs]; break;
	case SPRN_DBCR1:
		vcpu->arch.dbcr1 = vcpu->arch.gpr[rs]; break;
	case SPRN_TSR:
		vcpu->arch.tsr &= ~vcpu->arch.gpr[rs]; break;
	case SPRN_TCR:
		vcpu->arch.tcr = vcpu->arch.gpr[rs];
		kvmppc_emulate_dec(vcpu);
		break;

	/* Note: SPRG4-7 are user-readable. These values are
	 * loaded into the real SPRGs when resuming the
	 * guest. */
	case SPRN_SPRG4:
		vcpu->arch.sprg4 = vcpu->arch.gpr[rs]; break;
	case SPRN_SPRG5:
		vcpu->arch.sprg5 = vcpu->arch.gpr[rs]; break;
	case SPRN_SPRG6:
		vcpu->arch.sprg6 = vcpu->arch.gpr[rs]; break;
	case SPRN_SPRG7:
		vcpu->arch.sprg7 = vcpu->arch.gpr[rs]; break;

	case SPRN_IVPR:
		vcpu->arch.ivpr = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR0:
		vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR1:
		vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR2:
		vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR3:
		vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR4:
		vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR5:
		vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR6:
		vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR7:
		vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR8:
		vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR9:
		vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR10:
		vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR11:
		vcpu->arch.ivor[BOOKE_IRQPRIO_FIT] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR12:
		vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR13:
		vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR14:
		vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS] = vcpu->arch.gpr[rs];
		break;
	case SPRN_IVOR15:
		vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG] = vcpu->arch.gpr[rs];
		break;

	default:
		emulated = EMULATE_FAIL;
	}

	return emulated;
}

int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
{
	int emulated = EMULATE_DONE;

	switch (sprn) {
	case SPRN_IVPR:
		vcpu->arch.gpr[rt] = vcpu->arch.ivpr; break;
	case SPRN_DEAR:
		vcpu->arch.gpr[rt] = vcpu->arch.dear; break;
	case SPRN_ESR:
		vcpu->arch.gpr[rt] = vcpu->arch.esr; break;
	case SPRN_DBCR0:
		vcpu->arch.gpr[rt] = vcpu->arch.dbcr0; break;
	case SPRN_DBCR1:
		vcpu->arch.gpr[rt] = vcpu->arch.dbcr1; break;

	case SPRN_IVOR0:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL];
		break;
	case SPRN_IVOR1:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK];
		break;
	case SPRN_IVOR2:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE];
		break;
	case SPRN_IVOR3:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE];
		break;
	case SPRN_IVOR4:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL];
		break;
	case SPRN_IVOR5:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT];
		break;
	case SPRN_IVOR6:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM];
		break;
	case SPRN_IVOR7:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL];
		break;
	case SPRN_IVOR8:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL];
		break;
	case SPRN_IVOR9:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL];
		break;
	case SPRN_IVOR10:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER];
		break;
	case SPRN_IVOR11:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_FIT];
		break;
	case SPRN_IVOR12:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG];
		break;
	case SPRN_IVOR13:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS];
		break;
	case SPRN_IVOR14:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS];
		break;
	case SPRN_IVOR15:
		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG];
		break;

	default:
		emulated = EMULATE_FAIL;
	}

	return emulated;
}