1 /*
2  * Permission is hereby granted, free of charge, to any person obtaining a copy
3  * of this software and associated documentation files (the "Software"), to
4  * deal in the Software without restriction, including without limitation the
5  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
6  * sell copies of the Software, and to permit persons to whom the Software is
7  * furnished to do so, subject to the following conditions:
8  *
9  * The above copyright notice and this permission notice shall be included in
10  * all copies or substantial portions of the Software.
11  *
12  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
15  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
16  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
17  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
18  * DEALINGS IN THE SOFTWARE.
19  *
20  * Copyright (c) 2015, Roger Pau Monne <roger.pau@citrix.com>
21  */
22 
23 #ifndef __XEN_PUBLIC_HVM_HVM_VCPU_H__
24 #define __XEN_PUBLIC_HVM_HVM_VCPU_H__
25 
26 #include "../xen.h"
27 
28 struct vcpu_hvm_x86_32 {
29     uint32_t eax;
30     uint32_t ecx;
31     uint32_t edx;
32     uint32_t ebx;
33     uint32_t esp;
34     uint32_t ebp;
35     uint32_t esi;
36     uint32_t edi;
37     uint32_t eip;
38     uint32_t eflags;
39 
40     uint32_t cr0;
41     uint32_t cr3;
42     uint32_t cr4;
43 
44     uint32_t pad1;
45 
46     /*
47      * EFER should only be used to set the NXE bit (if required)
48      * when starting a vCPU in 32bit mode with paging enabled or
49      * to set the LME/LMA bits in order to start the vCPU in
50      * compatibility mode.
51      */
52     uint64_t efer;
53 
54     uint32_t cs_base;
55     uint32_t ds_base;
56     uint32_t ss_base;
57     uint32_t es_base;
58     uint32_t tr_base;
59     uint32_t cs_limit;
60     uint32_t ds_limit;
61     uint32_t ss_limit;
62     uint32_t es_limit;
63     uint32_t tr_limit;
64     uint16_t cs_ar;
65     uint16_t ds_ar;
66     uint16_t ss_ar;
67     uint16_t es_ar;
68     uint16_t tr_ar;
69 
70     uint16_t pad2[3];
71 };
72 
73 /*
74  * The layout of the _ar fields of the segment registers is the
75  * following:
76  *
77  * Bits   [0,3]: type (bits 40-43).
78  * Bit        4: s    (descriptor type, bit 44).
79  * Bit    [5,6]: dpl  (descriptor privilege level, bits 45-46).
80  * Bit        7: p    (segment-present, bit 47).
81  * Bit        8: avl  (available for system software, bit 52).
82  * Bit        9: l    (64-bit code segment, bit 53).
83  * Bit       10: db   (meaning depends on the segment, bit 54).
84  * Bit       11: g    (granularity, bit 55)
85  * Bits [12,15]: unused, must be blank.
86  *
87  * A more complete description of the meaning of this fields can be
88  * obtained from the Intel SDM, Volume 3, section 3.4.5.
89  */
90 
91 struct vcpu_hvm_x86_64 {
92     uint64_t rax;
93     uint64_t rcx;
94     uint64_t rdx;
95     uint64_t rbx;
96     uint64_t rsp;
97     uint64_t rbp;
98     uint64_t rsi;
99     uint64_t rdi;
100     uint64_t rip;
101     uint64_t rflags;
102 
103     uint64_t cr0;
104     uint64_t cr3;
105     uint64_t cr4;
106     uint64_t efer;
107 
108     /*
109      * Using VCPU_HVM_MODE_64B implies that the vCPU is launched
110      * directly in long mode, so the cached parts of the segment
111      * registers get set to match that environment.
112      *
113      * If the user wants to launch the vCPU in compatibility mode
114      * the 32-bit structure should be used instead.
115      */
116 };
117 
118 struct vcpu_hvm_context {
119 #define VCPU_HVM_MODE_32B 0  /* 32bit fields of the structure will be used. */
120 #define VCPU_HVM_MODE_64B 1  /* 64bit fields of the structure will be used. */
121     uint32_t mode;
122 
123     uint32_t pad;
124 
125     /* CPU registers. */
126     union {
127         struct vcpu_hvm_x86_32 x86_32;
128         struct vcpu_hvm_x86_64 x86_64;
129     } cpu_regs;
130 };
131 typedef struct vcpu_hvm_context vcpu_hvm_context_t;
132 
133 #endif /* __XEN_PUBLIC_HVM_HVM_VCPU_H__ */
134 
135 /*
136  * Local variables:
137  * mode: C
138  * c-file-style: "BSD"
139  * c-basic-offset: 4
140  * tab-width: 4
141  * indent-tabs-mode: nil
142  * End:
143  */
144