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ARM: KVM: abstract IL decoding away
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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
19#ifndef __ARM_KVM_EMULATE_H__
20#define __ARM_KVM_EMULATE_H__
21
22#include <linux/kvm_host.h>
23#include <asm/kvm_asm.h>
45e96ea6 24#include <asm/kvm_mmio.h>
7393b599 25#include <asm/kvm_arm.h>
749cf76c 26
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27unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num);
28unsigned long *vcpu_spsr(struct kvm_vcpu *vcpu);
749cf76c 29
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30int kvm_handle_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run);
31void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr);
32void kvm_inject_undefined(struct kvm_vcpu *vcpu);
33void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
34void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
35
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36static inline bool vcpu_mode_is_32bit(struct kvm_vcpu *vcpu)
37{
38 return 1;
39}
40
db730d8d 41static inline unsigned long *vcpu_pc(struct kvm_vcpu *vcpu)
749cf76c 42{
db730d8d 43 return &vcpu->arch.regs.usr_regs.ARM_pc;
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44}
45
db730d8d 46static inline unsigned long *vcpu_cpsr(struct kvm_vcpu *vcpu)
749cf76c 47{
db730d8d 48 return &vcpu->arch.regs.usr_regs.ARM_cpsr;
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49}
50
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51static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
52{
53 *vcpu_cpsr(vcpu) |= PSR_T_BIT;
54}
55
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56static inline bool mode_has_spsr(struct kvm_vcpu *vcpu)
57{
58 unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
59 return (cpsr_mode > USR_MODE && cpsr_mode < SYSTEM_MODE);
60}
61
62static inline bool vcpu_mode_priv(struct kvm_vcpu *vcpu)
63{
64 unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
65 return cpsr_mode > USR_MODE;;
66}
67
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68static inline bool kvm_vcpu_reg_is_pc(struct kvm_vcpu *vcpu, int reg)
69{
70 return reg == 15;
71}
72
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73static inline u32 kvm_vcpu_get_hsr(struct kvm_vcpu *vcpu)
74{
75 return vcpu->arch.fault.hsr;
76}
77
78static inline unsigned long kvm_vcpu_get_hfar(struct kvm_vcpu *vcpu)
79{
80 return vcpu->arch.fault.hxfar;
81}
82
83static inline phys_addr_t kvm_vcpu_get_fault_ipa(struct kvm_vcpu *vcpu)
84{
85 return ((phys_addr_t)vcpu->arch.fault.hpfar & HPFAR_MASK) << 8;
86}
87
88static inline unsigned long kvm_vcpu_get_hyp_pc(struct kvm_vcpu *vcpu)
89{
90 return vcpu->arch.fault.hyp_pc;
91}
92
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93static inline bool kvm_vcpu_dabt_isvalid(struct kvm_vcpu *vcpu)
94{
95 return kvm_vcpu_get_hsr(vcpu) & HSR_ISV;
96}
97
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98static inline bool kvm_vcpu_dabt_iswrite(struct kvm_vcpu *vcpu)
99{
100 return kvm_vcpu_get_hsr(vcpu) & HSR_WNR;
101}
102
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103static inline bool kvm_vcpu_dabt_issext(struct kvm_vcpu *vcpu)
104{
105 return kvm_vcpu_get_hsr(vcpu) & HSR_SSE;
106}
107
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108static inline int kvm_vcpu_dabt_get_rd(struct kvm_vcpu *vcpu)
109{
110 return (kvm_vcpu_get_hsr(vcpu) & HSR_SRT_MASK) >> HSR_SRT_SHIFT;
111}
112
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113static inline bool kvm_vcpu_dabt_isextabt(struct kvm_vcpu *vcpu)
114{
115 return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_EA;
116}
117
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118static inline bool kvm_vcpu_dabt_iss1tw(struct kvm_vcpu *vcpu)
119{
120 return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_S1PTW;
121}
122
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123/* Get Access Size from a data abort */
124static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
125{
126 switch ((kvm_vcpu_get_hsr(vcpu) >> 22) & 0x3) {
127 case 0:
128 return 1;
129 case 1:
130 return 2;
131 case 2:
132 return 4;
133 default:
134 kvm_err("Hardware is weird: SAS 0b11 is reserved\n");
135 return -EFAULT;
136 }
137}
138
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139/* This one is not specific to Data Abort */
140static inline bool kvm_vcpu_trap_il_is32bit(struct kvm_vcpu *vcpu)
141{
142 return kvm_vcpu_get_hsr(vcpu) & HSR_IL;
143}
144
749cf76c 145#endif /* __ARM_KVM_EMULATE_H__ */