meson: target
[qemu.git] / target / i386 / hvf / x86_descr.c
1 /*
2 * Copyright (C) 2016 Veertu Inc,
3 * Copyright (C) 2017 Google Inc,
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this program; if not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include "qemu/osdep.h"
20
21 #include "qemu-common.h"
22 #include "vmx.h"
23 #include "x86_descr.h"
24
25 #define VMX_SEGMENT_FIELD(seg) \
26 [R_##seg] = { \
27 .selector = VMCS_GUEST_##seg##_SELECTOR, \
28 .base = VMCS_GUEST_##seg##_BASE, \
29 .limit = VMCS_GUEST_##seg##_LIMIT, \
30 .ar_bytes = VMCS_GUEST_##seg##_ACCESS_RIGHTS, \
31 }
32
33 static const struct vmx_segment_field {
34 int selector;
35 int base;
36 int limit;
37 int ar_bytes;
38 } vmx_segment_fields[] = {
39 VMX_SEGMENT_FIELD(ES),
40 VMX_SEGMENT_FIELD(CS),
41 VMX_SEGMENT_FIELD(SS),
42 VMX_SEGMENT_FIELD(DS),
43 VMX_SEGMENT_FIELD(FS),
44 VMX_SEGMENT_FIELD(GS),
45 VMX_SEGMENT_FIELD(LDTR),
46 VMX_SEGMENT_FIELD(TR),
47 };
48
49 uint32_t vmx_read_segment_limit(CPUState *cpu, X86Seg seg)
50 {
51 return (uint32_t)rvmcs(cpu->hvf_fd, vmx_segment_fields[seg].limit);
52 }
53
54 uint32_t vmx_read_segment_ar(CPUState *cpu, X86Seg seg)
55 {
56 return (uint32_t)rvmcs(cpu->hvf_fd, vmx_segment_fields[seg].ar_bytes);
57 }
58
59 uint64_t vmx_read_segment_base(CPUState *cpu, X86Seg seg)
60 {
61 return rvmcs(cpu->hvf_fd, vmx_segment_fields[seg].base);
62 }
63
64 x68_segment_selector vmx_read_segment_selector(CPUState *cpu, X86Seg seg)
65 {
66 x68_segment_selector sel;
67 sel.sel = rvmcs(cpu->hvf_fd, vmx_segment_fields[seg].selector);
68 return sel;
69 }
70
71 void vmx_write_segment_selector(struct CPUState *cpu, x68_segment_selector selector, X86Seg seg)
72 {
73 wvmcs(cpu->hvf_fd, vmx_segment_fields[seg].selector, selector.sel);
74 }
75
76 void vmx_read_segment_descriptor(struct CPUState *cpu, struct vmx_segment *desc, X86Seg seg)
77 {
78 desc->sel = rvmcs(cpu->hvf_fd, vmx_segment_fields[seg].selector);
79 desc->base = rvmcs(cpu->hvf_fd, vmx_segment_fields[seg].base);
80 desc->limit = rvmcs(cpu->hvf_fd, vmx_segment_fields[seg].limit);
81 desc->ar = rvmcs(cpu->hvf_fd, vmx_segment_fields[seg].ar_bytes);
82 }
83
84 void vmx_write_segment_descriptor(CPUState *cpu, struct vmx_segment *desc, X86Seg seg)
85 {
86 const struct vmx_segment_field *sf = &vmx_segment_fields[seg];
87
88 wvmcs(cpu->hvf_fd, sf->base, desc->base);
89 wvmcs(cpu->hvf_fd, sf->limit, desc->limit);
90 wvmcs(cpu->hvf_fd, sf->selector, desc->sel);
91 wvmcs(cpu->hvf_fd, sf->ar_bytes, desc->ar);
92 }
93
94 void x86_segment_descriptor_to_vmx(struct CPUState *cpu, x68_segment_selector selector, struct x86_segment_descriptor *desc, struct vmx_segment *vmx_desc)
95 {
96 vmx_desc->sel = selector.sel;
97 vmx_desc->base = x86_segment_base(desc);
98 vmx_desc->limit = x86_segment_limit(desc);
99
100 vmx_desc->ar = (selector.sel ? 0 : 1) << 16 |
101 desc->g << 15 |
102 desc->db << 14 |
103 desc->l << 13 |
104 desc->avl << 12 |
105 desc->p << 7 |
106 desc->dpl << 5 |
107 desc->s << 4 |
108 desc->type;
109 }
110
111 void vmx_segment_to_x86_descriptor(struct CPUState *cpu, struct vmx_segment *vmx_desc, struct x86_segment_descriptor *desc)
112 {
113 x86_set_segment_limit(desc, vmx_desc->limit);
114 x86_set_segment_base(desc, vmx_desc->base);
115
116 desc->type = vmx_desc->ar & 15;
117 desc->s = (vmx_desc->ar >> 4) & 1;
118 desc->dpl = (vmx_desc->ar >> 5) & 3;
119 desc->p = (vmx_desc->ar >> 7) & 1;
120 desc->avl = (vmx_desc->ar >> 12) & 1;
121 desc->l = (vmx_desc->ar >> 13) & 1;
122 desc->db = (vmx_desc->ar >> 14) & 1;
123 desc->g = (vmx_desc->ar >> 15) & 1;
124 }
125