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/*
* 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;
}
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