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>
24#include <asm/kvm_mmio.h>
25#include <asm/kvm_arm.h>
26
27unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num);
28unsigned long *vcpu_spsr(struct kvm_vcpu *vcpu);
29
30bool kvm_condition_valid(struct kvm_vcpu *vcpu);
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
36static inline bool vcpu_mode_is_32bit(struct kvm_vcpu *vcpu)
37{
38	return 1;
39}
40
41static inline unsigned long *vcpu_pc(struct kvm_vcpu *vcpu)
42{
43	return &vcpu->arch.regs.usr_regs.ARM_pc;
44}
45
46static inline unsigned long *vcpu_cpsr(struct kvm_vcpu *vcpu)
47{
48	return &vcpu->arch.regs.usr_regs.ARM_cpsr;
49}
50
51static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
52{
53	*vcpu_cpsr(vcpu) |= PSR_T_BIT;
54}
55
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
68static inline u32 kvm_vcpu_get_hsr(struct kvm_vcpu *vcpu)
69{
70	return vcpu->arch.fault.hsr;
71}
72
73static inline unsigned long kvm_vcpu_get_hfar(struct kvm_vcpu *vcpu)
74{
75	return vcpu->arch.fault.hxfar;
76}
77
78static inline phys_addr_t kvm_vcpu_get_fault_ipa(struct kvm_vcpu *vcpu)
79{
80	return ((phys_addr_t)vcpu->arch.fault.hpfar & HPFAR_MASK) << 8;
81}
82
83static inline unsigned long kvm_vcpu_get_hyp_pc(struct kvm_vcpu *vcpu)
84{
85	return vcpu->arch.fault.hyp_pc;
86}
87
88static inline bool kvm_vcpu_dabt_isvalid(struct kvm_vcpu *vcpu)
89{
90	return kvm_vcpu_get_hsr(vcpu) & HSR_ISV;
91}
92
93static inline bool kvm_vcpu_dabt_iswrite(struct kvm_vcpu *vcpu)
94{
95	return kvm_vcpu_get_hsr(vcpu) & HSR_WNR;
96}
97
98static inline bool kvm_vcpu_dabt_issext(struct kvm_vcpu *vcpu)
99{
100	return kvm_vcpu_get_hsr(vcpu) & HSR_SSE;
101}
102
103static inline int kvm_vcpu_dabt_get_rd(struct kvm_vcpu *vcpu)
104{
105	return (kvm_vcpu_get_hsr(vcpu) & HSR_SRT_MASK) >> HSR_SRT_SHIFT;
106}
107
108static inline bool kvm_vcpu_dabt_isextabt(struct kvm_vcpu *vcpu)
109{
110	return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_EA;
111}
112
113static inline bool kvm_vcpu_dabt_iss1tw(struct kvm_vcpu *vcpu)
114{
115	return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_S1PTW;
116}
117
118/* Get Access Size from a data abort */
119static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
120{
121	switch ((kvm_vcpu_get_hsr(vcpu) >> 22) & 0x3) {
122	case 0:
123		return 1;
124	case 1:
125		return 2;
126	case 2:
127		return 4;
128	default:
129		kvm_err("Hardware is weird: SAS 0b11 is reserved\n");
130		return -EFAULT;
131	}
132}
133
134/* This one is not specific to Data Abort */
135static inline bool kvm_vcpu_trap_il_is32bit(struct kvm_vcpu *vcpu)
136{
137	return kvm_vcpu_get_hsr(vcpu) & HSR_IL;
138}
139
140static inline u8 kvm_vcpu_trap_get_class(struct kvm_vcpu *vcpu)
141{
142	return kvm_vcpu_get_hsr(vcpu) >> HSR_EC_SHIFT;
143}
144
145static inline bool kvm_vcpu_trap_is_iabt(struct kvm_vcpu *vcpu)
146{
147	return kvm_vcpu_trap_get_class(vcpu) == HSR_EC_IABT;
148}
149
150static inline u8 kvm_vcpu_trap_get_fault(struct kvm_vcpu *vcpu)
151{
152	return kvm_vcpu_get_hsr(vcpu) & HSR_FSC;
153}
154
155static inline u8 kvm_vcpu_trap_get_fault_type(struct kvm_vcpu *vcpu)
156{
157	return kvm_vcpu_get_hsr(vcpu) & HSR_FSC_TYPE;
158}
159
160static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)
161{
162	return kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK;
163}
164
165static inline unsigned long kvm_vcpu_get_mpidr(struct kvm_vcpu *vcpu)
166{
167	return vcpu->arch.cp15[c0_MPIDR];
168}
169
170static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
171{
172	*vcpu_cpsr(vcpu) |= PSR_E_BIT;
173}
174
175static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
176{
177	return !!(*vcpu_cpsr(vcpu) & PSR_E_BIT);
178}
179
180static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
181						    unsigned long data,
182						    unsigned int len)
183{
184	if (kvm_vcpu_is_be(vcpu)) {
185		switch (len) {
186		case 1:
187			return data & 0xff;
188		case 2:
189			return be16_to_cpu(data & 0xffff);
190		default:
191			return be32_to_cpu(data);
192		}
193	} else {
194		switch (len) {
195		case 1:
196			return data & 0xff;
197		case 2:
198			return le16_to_cpu(data & 0xffff);
199		default:
200			return le32_to_cpu(data);
201		}
202	}
203}
204
205static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
206						    unsigned long data,
207						    unsigned int len)
208{
209	if (kvm_vcpu_is_be(vcpu)) {
210		switch (len) {
211		case 1:
212			return data & 0xff;
213		case 2:
214			return cpu_to_be16(data & 0xffff);
215		default:
216			return cpu_to_be32(data);
217		}
218	} else {
219		switch (len) {
220		case 1:
221			return data & 0xff;
222		case 2:
223			return cpu_to_le16(data & 0xffff);
224		default:
225			return cpu_to_le32(data);
226		}
227	}
228}
229
230#endif /* __ARM_KVM_EMULATE_H__ */
231