tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include <asm/cputype.h>
27
28unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num);
29unsigned long *vcpu_spsr(struct kvm_vcpu *vcpu);
30
31static inline unsigned long vcpu_get_reg(struct kvm_vcpu *vcpu,
32 u8 reg_num)
33{
34 return *vcpu_reg(vcpu, reg_num);
35}
36
37static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
38 unsigned long val)
39{
40 *vcpu_reg(vcpu, reg_num) = val;
41}
42
43bool kvm_condition_valid32(const struct kvm_vcpu *vcpu);
44void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr);
45void kvm_inject_undefined(struct kvm_vcpu *vcpu);
46void kvm_inject_vabt(struct kvm_vcpu *vcpu);
47void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
48void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
49
50static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
51{
52 return kvm_condition_valid32(vcpu);
53}
54
55static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
56{
57 kvm_skip_instr32(vcpu, is_wide_instr);
58}
59
60static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
61{
62 vcpu->arch.hcr = HCR_GUEST_MASK;
63}
64
65static inline unsigned long vcpu_get_hcr(const struct kvm_vcpu *vcpu)
66{
67 return vcpu->arch.hcr;
68}
69
70static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr)
71{
72 vcpu->arch.hcr = hcr;
73}
74
75static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
76{
77 return 1;
78}
79
80static inline unsigned long *vcpu_pc(struct kvm_vcpu *vcpu)
81{
82 return &vcpu->arch.ctxt.gp_regs.usr_regs.ARM_pc;
83}
84
85static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
86{
87 return (unsigned long *)&vcpu->arch.ctxt.gp_regs.usr_regs.ARM_cpsr;
88}
89
90static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
91{
92 *vcpu_cpsr(vcpu) |= PSR_T_BIT;
93}
94
95static inline bool mode_has_spsr(struct kvm_vcpu *vcpu)
96{
97 unsigned long cpsr_mode = vcpu->arch.ctxt.gp_regs.usr_regs.ARM_cpsr & MODE_MASK;
98 return (cpsr_mode > USR_MODE && cpsr_mode < SYSTEM_MODE);
99}
100
101static inline bool vcpu_mode_priv(struct kvm_vcpu *vcpu)
102{
103 unsigned long cpsr_mode = vcpu->arch.ctxt.gp_regs.usr_regs.ARM_cpsr & MODE_MASK;
104 return cpsr_mode > USR_MODE;;
105}
106
107static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu)
108{
109 return vcpu->arch.fault.hsr;
110}
111
112static inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu)
113{
114 u32 hsr = kvm_vcpu_get_hsr(vcpu);
115
116 if (hsr & HSR_CV)
117 return (hsr & HSR_COND) >> HSR_COND_SHIFT;
118
119 return -1;
120}
121
122static inline unsigned long kvm_vcpu_get_hfar(struct kvm_vcpu *vcpu)
123{
124 return vcpu->arch.fault.hxfar;
125}
126
127static inline phys_addr_t kvm_vcpu_get_fault_ipa(struct kvm_vcpu *vcpu)
128{
129 return ((phys_addr_t)vcpu->arch.fault.hpfar & HPFAR_MASK) << 8;
130}
131
132static inline bool kvm_vcpu_dabt_isvalid(struct kvm_vcpu *vcpu)
133{
134 return kvm_vcpu_get_hsr(vcpu) & HSR_ISV;
135}
136
137static inline bool kvm_vcpu_dabt_iswrite(struct kvm_vcpu *vcpu)
138{
139 return kvm_vcpu_get_hsr(vcpu) & HSR_WNR;
140}
141
142static inline bool kvm_vcpu_dabt_issext(struct kvm_vcpu *vcpu)
143{
144 return kvm_vcpu_get_hsr(vcpu) & HSR_SSE;
145}
146
147static inline int kvm_vcpu_dabt_get_rd(struct kvm_vcpu *vcpu)
148{
149 return (kvm_vcpu_get_hsr(vcpu) & HSR_SRT_MASK) >> HSR_SRT_SHIFT;
150}
151
152static inline bool kvm_vcpu_dabt_isextabt(struct kvm_vcpu *vcpu)
153{
154 return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_EA;
155}
156
157static inline bool kvm_vcpu_dabt_iss1tw(struct kvm_vcpu *vcpu)
158{
159 return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_S1PTW;
160}
161
162static inline bool kvm_vcpu_dabt_is_cm(struct kvm_vcpu *vcpu)
163{
164 return !!(kvm_vcpu_get_hsr(vcpu) & HSR_DABT_CM);
165}
166
167/* Get Access Size from a data abort */
168static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
169{
170 switch ((kvm_vcpu_get_hsr(vcpu) >> 22) & 0x3) {
171 case 0:
172 return 1;
173 case 1:
174 return 2;
175 case 2:
176 return 4;
177 default:
178 kvm_err("Hardware is weird: SAS 0b11 is reserved\n");
179 return -EFAULT;
180 }
181}
182
183/* This one is not specific to Data Abort */
184static inline bool kvm_vcpu_trap_il_is32bit(struct kvm_vcpu *vcpu)
185{
186 return kvm_vcpu_get_hsr(vcpu) & HSR_IL;
187}
188
189static inline u8 kvm_vcpu_trap_get_class(struct kvm_vcpu *vcpu)
190{
191 return kvm_vcpu_get_hsr(vcpu) >> HSR_EC_SHIFT;
192}
193
194static inline bool kvm_vcpu_trap_is_iabt(struct kvm_vcpu *vcpu)
195{
196 return kvm_vcpu_trap_get_class(vcpu) == HSR_EC_IABT;
197}
198
199static inline u8 kvm_vcpu_trap_get_fault(struct kvm_vcpu *vcpu)
200{
201 return kvm_vcpu_get_hsr(vcpu) & HSR_FSC;
202}
203
204static inline u8 kvm_vcpu_trap_get_fault_type(struct kvm_vcpu *vcpu)
205{
206 return kvm_vcpu_get_hsr(vcpu) & HSR_FSC_TYPE;
207}
208
209static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)
210{
211 return kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK;
212}
213
214static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
215{
216 return vcpu_cp15(vcpu, c0_MPIDR) & MPIDR_HWID_BITMASK;
217}
218
219static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
220{
221 *vcpu_cpsr(vcpu) |= PSR_E_BIT;
222}
223
224static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
225{
226 return !!(*vcpu_cpsr(vcpu) & PSR_E_BIT);
227}
228
229static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
230 unsigned long data,
231 unsigned int len)
232{
233 if (kvm_vcpu_is_be(vcpu)) {
234 switch (len) {
235 case 1:
236 return data & 0xff;
237 case 2:
238 return be16_to_cpu(data & 0xffff);
239 default:
240 return be32_to_cpu(data);
241 }
242 } else {
243 switch (len) {
244 case 1:
245 return data & 0xff;
246 case 2:
247 return le16_to_cpu(data & 0xffff);
248 default:
249 return le32_to_cpu(data);
250 }
251 }
252}
253
254static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
255 unsigned long data,
256 unsigned int len)
257{
258 if (kvm_vcpu_is_be(vcpu)) {
259 switch (len) {
260 case 1:
261 return data & 0xff;
262 case 2:
263 return cpu_to_be16(data & 0xffff);
264 default:
265 return cpu_to_be32(data);
266 }
267 } else {
268 switch (len) {
269 case 1:
270 return data & 0xff;
271 case 2:
272 return cpu_to_le16(data & 0xffff);
273 default:
274 return cpu_to_le32(data);
275 }
276 }
277}
278
279#endif /* __ARM_KVM_EMULATE_H__ */