tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * Copyright (C) 2016, VMware, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
12 * NON INFRINGEMENT. See the GNU General Public License for more
13 * details.
14 *
15 * Based on code from vmware.c and vmmouse.c.
16 * Author:
17 * Sinclair Yeh <syeh@vmware.com>
18 */
19#ifndef _VMWGFX_MSG_H
20#define _VMWGFX_MSG_H
21
22
23/**
24 * Hypervisor-specific bi-directional communication channel. Should never
25 * execute on bare metal hardware. The caller must make sure to check for
26 * supported hypervisor before using these macros.
27 *
28 * The last two parameters are both input and output and must be initialized.
29 *
30 * @cmd: [IN] Message Cmd
31 * @in_ebx: [IN] Message Len, through EBX
32 * @in_si: [IN] Input argument through SI, set to 0 if not used
33 * @in_di: [IN] Input argument through DI, set ot 0 if not used
34 * @port_num: [IN] port number + [channel id]
35 * @magic: [IN] hypervisor magic value
36 * @eax: [OUT] value of EAX register
37 * @ebx: [OUT] e.g. status from an HB message status command
38 * @ecx: [OUT] e.g. status from a non-HB message status command
39 * @edx: [OUT] e.g. channel id
40 * @si: [OUT]
41 * @di: [OUT]
42 */
43#define VMW_PORT(cmd, in_ebx, in_si, in_di, \
44 port_num, magic, \
45 eax, ebx, ecx, edx, si, di) \
46({ \
47 asm volatile ("inl %%dx, %%eax;" : \
48 "=a"(eax), \
49 "=b"(ebx), \
50 "=c"(ecx), \
51 "=d"(edx), \
52 "=S"(si), \
53 "=D"(di) : \
54 "a"(magic), \
55 "b"(in_ebx), \
56 "c"(cmd), \
57 "d"(port_num), \
58 "S"(in_si), \
59 "D"(in_di) : \
60 "memory"); \
61})
62
63
64/**
65 * Hypervisor-specific bi-directional communication channel. Should never
66 * execute on bare metal hardware. The caller must make sure to check for
67 * supported hypervisor before using these macros.
68 *
69 * The last 3 parameters are both input and output and must be initialized.
70 *
71 * @cmd: [IN] Message Cmd
72 * @in_ecx: [IN] Message Len, through ECX
73 * @in_si: [IN] Input argument through SI, set to 0 if not used
74 * @in_di: [IN] Input argument through DI, set to 0 if not used
75 * @port_num: [IN] port number + [channel id]
76 * @magic: [IN] hypervisor magic value
77 * @bp: [IN]
78 * @eax: [OUT] value of EAX register
79 * @ebx: [OUT] e.g. status from an HB message status command
80 * @ecx: [OUT] e.g. status from a non-HB message status command
81 * @edx: [OUT] e.g. channel id
82 * @si: [OUT]
83 * @di: [OUT]
84 */
85#ifdef __x86_64__
86
87#define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di, \
88 port_num, magic, bp, \
89 eax, ebx, ecx, edx, si, di) \
90({ \
91 asm volatile ("push %%rbp;" \
92 "mov %12, %%rbp;" \
93 "rep outsb;" \
94 "pop %%rbp;" : \
95 "=a"(eax), \
96 "=b"(ebx), \
97 "=c"(ecx), \
98 "=d"(edx), \
99 "=S"(si), \
100 "=D"(di) : \
101 "a"(magic), \
102 "b"(cmd), \
103 "c"(in_ecx), \
104 "d"(port_num), \
105 "S"(in_si), \
106 "D"(in_di), \
107 "r"(bp) : \
108 "memory", "cc"); \
109})
110
111
112#define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di, \
113 port_num, magic, bp, \
114 eax, ebx, ecx, edx, si, di) \
115({ \
116 asm volatile ("push %%rbp;" \
117 "mov %12, %%rbp;" \
118 "rep insb;" \
119 "pop %%rbp" : \
120 "=a"(eax), \
121 "=b"(ebx), \
122 "=c"(ecx), \
123 "=d"(edx), \
124 "=S"(si), \
125 "=D"(di) : \
126 "a"(magic), \
127 "b"(cmd), \
128 "c"(in_ecx), \
129 "d"(port_num), \
130 "S"(in_si), \
131 "D"(in_di), \
132 "r"(bp) : \
133 "memory", "cc"); \
134})
135
136#else
137
138/* In the 32-bit version of this macro, we use "m" because there is no
139 * more register left for bp
140 */
141#define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di, \
142 port_num, magic, bp, \
143 eax, ebx, ecx, edx, si, di) \
144({ \
145 asm volatile ("push %%ebp;" \
146 "mov %12, %%ebp;" \
147 "rep outsb;" \
148 "pop %%ebp;" : \
149 "=a"(eax), \
150 "=b"(ebx), \
151 "=c"(ecx), \
152 "=d"(edx), \
153 "=S"(si), \
154 "=D"(di) : \
155 "a"(magic), \
156 "b"(cmd), \
157 "c"(in_ecx), \
158 "d"(port_num), \
159 "S"(in_si), \
160 "D"(in_di), \
161 "m"(bp) : \
162 "memory", "cc"); \
163})
164
165
166#define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di, \
167 port_num, magic, bp, \
168 eax, ebx, ecx, edx, si, di) \
169({ \
170 asm volatile ("push %%ebp;" \
171 "mov %12, %%ebp;" \
172 "rep insb;" \
173 "pop %%ebp" : \
174 "=a"(eax), \
175 "=b"(ebx), \
176 "=c"(ecx), \
177 "=d"(edx), \
178 "=S"(si), \
179 "=D"(di) : \
180 "a"(magic), \
181 "b"(cmd), \
182 "c"(in_ecx), \
183 "d"(port_num), \
184 "S"(in_si), \
185 "D"(in_di), \
186 "m"(bp) : \
187 "memory", "cc"); \
188})
189#endif /* #if __x86_64__ */
190
191#endif