arch/powerpc/kvm/booke_emulate.c

Source file repositories/reference/linux-study-clean/arch/powerpc/kvm/booke_emulate.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/kvm/booke_emulate.c
Extension
.c
Size
11297 bytes
Lines
512
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

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

		case OP_19_XOP_RFCI:
			kvmppc_emul_rfci(vcpu);
			kvmppc_set_exit_type(vcpu, EMULATED_RFCI_EXITS);
			*advance = 0;
			break;

		case OP_19_XOP_RFDI:
			kvmppc_emul_rfdi(vcpu);
			kvmppc_set_exit_type(vcpu, EMULATED_RFDI_EXITS);
			*advance = 0;
			break;

		default:
			emulated = EMULATE_FAIL;
			break;
		}
		break;

	case 31:
		switch (get_xop(inst)) {

		case OP_31_XOP_MFMSR:
			kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->msr);
			kvmppc_set_exit_type(vcpu, EMULATED_MFMSR_EXITS);
			break;

		case OP_31_XOP_MTMSR:
			kvmppc_set_exit_type(vcpu, EMULATED_MTMSR_EXITS);
			kvmppc_set_msr(vcpu, kvmppc_get_gpr(vcpu, rs));
			break;

		case OP_31_XOP_WRTEE:
			vcpu->arch.shared->msr = (vcpu->arch.shared->msr & ~MSR_EE)
					| (kvmppc_get_gpr(vcpu, rs) & MSR_EE);
			kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
			break;

		case OP_31_XOP_WRTEEI:
			vcpu->arch.shared->msr = (vcpu->arch.shared->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;
}

/*
 * NOTE: some of these registers are not emulated on BOOKE_HV (GS-mode).
 * Their backing store is in real registers, and these functions
 * will return the wrong result if called for them in another context
 * (such as debugging).
 */
int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
{
	int emulated = EMULATE_DONE;
	bool debug_inst = false;

	switch (sprn) {
	case SPRN_DEAR:
		vcpu->arch.shared->dar = spr_val;
		break;
	case SPRN_ESR:
		vcpu->arch.shared->esr = spr_val;
		break;
	case SPRN_CSRR0:
		vcpu->arch.csrr0 = spr_val;
		break;
	case SPRN_CSRR1:
		vcpu->arch.csrr1 = spr_val;
		break;
	case SPRN_DSRR0:
		vcpu->arch.dsrr0 = spr_val;
		break;

Annotation

Implementation Notes