c46dc9a861
Instructions on PPC are pretty similarly encoded. So instead of every instruction emulation code decoding the instruction fields itself, we can move that code to more generic places and rely on the compiler to optimize the unused bits away. This has 2 advantages. It makes the code smaller and it makes the code less error prone, as the instruction fields are always available, so accidental misusage is reduced. Functionally, this patch doesn't change anything. Signed-off-by: Alexander Graf <agraf@suse.de>
170 lines
4.2 KiB
C
170 lines
4.2 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright IBM Corp. 2008
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*
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* Authors: Hollis Blanchard <hollisb@us.ibm.com>
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*/
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#include <asm/kvm_ppc.h>
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#include <asm/dcr.h>
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#include <asm/dcr-regs.h>
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#include <asm/disassemble.h>
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#include <asm/kvm_44x.h>
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#include "timing.h"
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#include "booke.h"
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#include "44x_tlb.h"
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#define XOP_MFDCR 323
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#define XOP_MTDCR 451
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#define XOP_TLBSX 914
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#define XOP_ICCCI 966
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#define XOP_TLBWE 978
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int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
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unsigned int inst, int *advance)
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{
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int emulated = EMULATE_DONE;
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int dcrn = get_dcrn(inst);
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int ra = get_ra(inst);
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int rb = get_rb(inst);
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int rc = get_rc(inst);
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int rs = get_rs(inst);
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int rt = get_rt(inst);
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int ws = get_ws(inst);
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switch (get_op(inst)) {
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case 31:
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switch (get_xop(inst)) {
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case XOP_MFDCR:
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/* The guest may access CPR0 registers to determine the timebase
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* frequency, and it must know the real host frequency because it
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* can directly access the timebase registers.
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*
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* It would be possible to emulate those accesses in userspace,
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* but userspace can really only figure out the end frequency.
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* We could decompose that into the factors that compute it, but
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* that's tricky math, and it's easier to just report the real
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* CPR0 values.
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*/
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switch (dcrn) {
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case DCRN_CPR0_CONFIG_ADDR:
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kvmppc_set_gpr(vcpu, rt, vcpu->arch.cpr0_cfgaddr);
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break;
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case DCRN_CPR0_CONFIG_DATA:
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local_irq_disable();
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mtdcr(DCRN_CPR0_CONFIG_ADDR,
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vcpu->arch.cpr0_cfgaddr);
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kvmppc_set_gpr(vcpu, rt,
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mfdcr(DCRN_CPR0_CONFIG_DATA));
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local_irq_enable();
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break;
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default:
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run->dcr.dcrn = dcrn;
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run->dcr.data = 0;
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run->dcr.is_write = 0;
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vcpu->arch.io_gpr = rt;
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vcpu->arch.dcr_needed = 1;
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kvmppc_account_exit(vcpu, DCR_EXITS);
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emulated = EMULATE_DO_DCR;
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}
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break;
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case XOP_MTDCR:
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/* emulate some access in kernel */
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switch (dcrn) {
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case DCRN_CPR0_CONFIG_ADDR:
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vcpu->arch.cpr0_cfgaddr = kvmppc_get_gpr(vcpu, rs);
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break;
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default:
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run->dcr.dcrn = dcrn;
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run->dcr.data = kvmppc_get_gpr(vcpu, rs);
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run->dcr.is_write = 1;
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vcpu->arch.dcr_needed = 1;
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kvmppc_account_exit(vcpu, DCR_EXITS);
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emulated = EMULATE_DO_DCR;
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}
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break;
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case XOP_TLBWE:
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emulated = kvmppc_44x_emul_tlbwe(vcpu, ra, rs, ws);
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break;
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case XOP_TLBSX:
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emulated = kvmppc_44x_emul_tlbsx(vcpu, rt, ra, rb, rc);
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break;
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case XOP_ICCCI:
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break;
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default:
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emulated = EMULATE_FAIL;
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}
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break;
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default:
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emulated = EMULATE_FAIL;
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}
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if (emulated == EMULATE_FAIL)
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emulated = kvmppc_booke_emulate_op(run, vcpu, inst, advance);
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return emulated;
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}
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int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
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{
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int emulated = EMULATE_DONE;
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switch (sprn) {
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case SPRN_PID:
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kvmppc_set_pid(vcpu, kvmppc_get_gpr(vcpu, rs)); break;
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case SPRN_MMUCR:
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vcpu->arch.mmucr = kvmppc_get_gpr(vcpu, rs); break;
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case SPRN_CCR0:
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vcpu->arch.ccr0 = kvmppc_get_gpr(vcpu, rs); break;
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case SPRN_CCR1:
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vcpu->arch.ccr1 = kvmppc_get_gpr(vcpu, rs); break;
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default:
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emulated = kvmppc_booke_emulate_mtspr(vcpu, sprn, rs);
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}
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return emulated;
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}
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int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
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{
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int emulated = EMULATE_DONE;
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switch (sprn) {
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case SPRN_PID:
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kvmppc_set_gpr(vcpu, rt, vcpu->arch.pid); break;
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case SPRN_MMUCR:
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kvmppc_set_gpr(vcpu, rt, vcpu->arch.mmucr); break;
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case SPRN_CCR0:
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kvmppc_set_gpr(vcpu, rt, vcpu->arch.ccr0); break;
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case SPRN_CCR1:
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kvmppc_set_gpr(vcpu, rt, vcpu->arch.ccr1); break;
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default:
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emulated = kvmppc_booke_emulate_mfspr(vcpu, sprn, rt);
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}
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return emulated;
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}
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