1 /*
2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 */
18 #include <linux/compiler.h>
19 #include <linux/errno.h>
20 #include <linux/sched.h>
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23
24 #include <asm/unified.h>
25 #include <asm/ptrace.h>
26 #include <asm/cputype.h>
27 #include <asm/kvm_arm.h>
28 #include <asm/kvm_coproc.h>
29
30 /******************************************************************************
31 * Cortex-A15 Reset Values
32 */
33
34 static const int a15_max_cpu_idx = 3;
35
36 static struct kvm_regs a15_regs_reset = {
37 .usr_regs.ARM_cpsr = SVC_MODE | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT,
38 };
39
40
41 /*******************************************************************************
42 * Exported reset function
43 */
44
45 /**
46 * kvm_reset_vcpu - sets core registers and cp15 registers to reset value
47 * @vcpu: The VCPU pointer
48 *
49 * This function finds the right table above and sets the registers on the
50 * virtual CPU struct to their architectually defined reset values.
51 */
kvm_reset_vcpu(struct kvm_vcpu * vcpu)52 int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
53 {
54 struct kvm_regs *cpu_reset;
55
56 switch (vcpu->arch.target) {
57 case KVM_ARM_TARGET_CORTEX_A15:
58 if (vcpu->vcpu_id > a15_max_cpu_idx)
59 return -EINVAL;
60 cpu_reset = &a15_regs_reset;
61 vcpu->arch.midr = read_cpuid_id();
62 break;
63 default:
64 return -ENODEV;
65 }
66
67 /* Reset core registers */
68 memcpy(&vcpu->arch.regs, cpu_reset, sizeof(vcpu->arch.regs));
69
70 /* Reset CP15 registers */
71 kvm_reset_coprocs(vcpu);
72
73 return 0;
74 }
75