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749cf76c CD |
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 | ||
5ae7f87a AP |
30 | #include <kvm/arm_arch_timer.h> |
31 | ||
749cf76c CD |
32 | /****************************************************************************** |
33 | * Cortex-A15 Reset Values | |
34 | */ | |
35 | ||
36 | static const int a15_max_cpu_idx = 3; | |
37 | ||
38 | static struct kvm_regs a15_regs_reset = { | |
39 | .usr_regs.ARM_cpsr = SVC_MODE | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT, | |
40 | }; | |
41 | ||
5ae7f87a AP |
42 | static const struct kvm_irq_level a15_vtimer_irq = { |
43 | .irq = 27, | |
44 | .level = 1, | |
45 | }; | |
46 | ||
749cf76c CD |
47 | |
48 | /******************************************************************************* | |
49 | * Exported reset function | |
50 | */ | |
51 | ||
52 | /** | |
53 | * kvm_reset_vcpu - sets core registers and cp15 registers to reset value | |
54 | * @vcpu: The VCPU pointer | |
55 | * | |
56 | * This function finds the right table above and sets the registers on the | |
57 | * virtual CPU struct to their architectually defined reset values. | |
58 | */ | |
59 | int kvm_reset_vcpu(struct kvm_vcpu *vcpu) | |
60 | { | |
61 | struct kvm_regs *cpu_reset; | |
5ae7f87a | 62 | const struct kvm_irq_level *cpu_vtimer_irq; |
749cf76c CD |
63 | |
64 | switch (vcpu->arch.target) { | |
65 | case KVM_ARM_TARGET_CORTEX_A15: | |
66 | if (vcpu->vcpu_id > a15_max_cpu_idx) | |
67 | return -EINVAL; | |
68 | cpu_reset = &a15_regs_reset; | |
69 | vcpu->arch.midr = read_cpuid_id(); | |
5ae7f87a | 70 | cpu_vtimer_irq = &a15_vtimer_irq; |
749cf76c CD |
71 | break; |
72 | default: | |
73 | return -ENODEV; | |
74 | } | |
75 | ||
76 | /* Reset core registers */ | |
77 | memcpy(&vcpu->arch.regs, cpu_reset, sizeof(vcpu->arch.regs)); | |
78 | ||
79 | /* Reset CP15 registers */ | |
80 | kvm_reset_coprocs(vcpu); | |
81 | ||
5ae7f87a AP |
82 | /* Reset arch_timer context */ |
83 | kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq); | |
84 | ||
749cf76c CD |
85 | return 0; |
86 | } |