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1/* SPDX-License-Identifier: GPL-2.0+ OR MIT */
2/**************************************************************************
3 *
4 * Copyright 2016-2021 VMware, Inc., Palo Alto, CA., USA
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************
27 *
28 * Based on code from vmware.c and vmmouse.c.
29 * Author:
30 * Sinclair Yeh <syeh@vmware.com>
31 */
32#ifndef _VMWGFX_MSG_X86_H
33#define _VMWGFX_MSG_X86_H
34
35
36#if defined(__i386__) || defined(__x86_64__)
37
38#include <asm/vmware.h>
39
40/**
41 * Hypervisor-specific bi-directional communication channel. Should never
42 * execute on bare metal hardware. The caller must make sure to check for
43 * supported hypervisor before using these macros.
44 *
45 * The last two parameters are both input and output and must be initialized.
46 *
47 * @cmd: [IN] Message Cmd
48 * @in_ebx: [IN] Message Len, through EBX
49 * @in_si: [IN] Input argument through SI, set to 0 if not used
50 * @in_di: [IN] Input argument through DI, set ot 0 if not used
51 * @flags: [IN] hypercall flags + [channel id]
52 * @magic: [IN] hypervisor magic value
53 * @eax: [OUT] value of EAX register
54 * @ebx: [OUT] e.g. status from an HB message status command
55 * @ecx: [OUT] e.g. status from a non-HB message status command
56 * @edx: [OUT] e.g. channel id
57 * @si: [OUT]
58 * @di: [OUT]
59 */
60#define VMW_PORT(cmd, in_ebx, in_si, in_di, \
61 flags, magic, \
62 eax, ebx, ecx, edx, si, di) \
63({ \
64 asm volatile (VMWARE_HYPERCALL : \
65 "=a"(eax), \
66 "=b"(ebx), \
67 "=c"(ecx), \
68 "=d"(edx), \
69 "=S"(si), \
70 "=D"(di) : \
71 "a"(magic), \
72 "b"(in_ebx), \
73 "c"(cmd), \
74 "d"(flags), \
75 "S"(in_si), \
76 "D"(in_di) : \
77 "memory"); \
78})
79
80
81/**
82 * Hypervisor-specific bi-directional communication channel. Should never
83 * execute on bare metal hardware. The caller must make sure to check for
84 * supported hypervisor before using these macros.
85 *
86 * The last 3 parameters are both input and output and must be initialized.
87 *
88 * @cmd: [IN] Message Cmd
89 * @in_ecx: [IN] Message Len, through ECX
90 * @in_si: [IN] Input argument through SI, set to 0 if not used
91 * @in_di: [IN] Input argument through DI, set to 0 if not used
92 * @flags: [IN] hypercall flags + [channel id]
93 * @magic: [IN] hypervisor magic value
94 * @bp: [IN]
95 * @eax: [OUT] value of EAX register
96 * @ebx: [OUT] e.g. status from an HB message status command
97 * @ecx: [OUT] e.g. status from a non-HB message status command
98 * @edx: [OUT] e.g. channel id
99 * @si: [OUT]
100 * @di: [OUT]
101 */
102#ifdef __x86_64__
103
104#define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di, \
105 flags, magic, bp, \
106 eax, ebx, ecx, edx, si, di) \
107({ \
108 asm volatile ( \
109 UNWIND_HINT_SAVE \
110 "push %%rbp;" \
111 UNWIND_HINT_UNDEFINED \
112 "mov %12, %%rbp;" \
113 VMWARE_HYPERCALL_HB_OUT \
114 "pop %%rbp;" \
115 UNWIND_HINT_RESTORE : \
116 "=a"(eax), \
117 "=b"(ebx), \
118 "=c"(ecx), \
119 "=d"(edx), \
120 "=S"(si), \
121 "=D"(di) : \
122 "a"(magic), \
123 "b"(cmd), \
124 "c"(in_ecx), \
125 "d"(flags), \
126 "S"(in_si), \
127 "D"(in_di), \
128 "r"(bp) : \
129 "memory", "cc"); \
130})
131
132
133#define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di, \
134 flags, magic, bp, \
135 eax, ebx, ecx, edx, si, di) \
136({ \
137 asm volatile ( \
138 UNWIND_HINT_SAVE \
139 "push %%rbp;" \
140 UNWIND_HINT_UNDEFINED \
141 "mov %12, %%rbp;" \
142 VMWARE_HYPERCALL_HB_IN \
143 "pop %%rbp;" \
144 UNWIND_HINT_RESTORE : \
145 "=a"(eax), \
146 "=b"(ebx), \
147 "=c"(ecx), \
148 "=d"(edx), \
149 "=S"(si), \
150 "=D"(di) : \
151 "a"(magic), \
152 "b"(cmd), \
153 "c"(in_ecx), \
154 "d"(flags), \
155 "S"(in_si), \
156 "D"(in_di), \
157 "r"(bp) : \
158 "memory", "cc"); \
159})
160
161#elif defined(__i386__)
162
163/*
164 * In the 32-bit version of this macro, we store bp in a memory location
165 * because we've ran out of registers.
166 * Now we can't reference that memory location while we've modified
167 * %esp or %ebp, so we first push it on the stack, just before we push
168 * %ebp, and then when we need it we read it from the stack where we
169 * just pushed it.
170 */
171#define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di, \
172 flags, magic, bp, \
173 eax, ebx, ecx, edx, si, di) \
174({ \
175 asm volatile ("push %12;" \
176 "push %%ebp;" \
177 "mov 0x04(%%esp), %%ebp;" \
178 VMWARE_HYPERCALL_HB_OUT \
179 "pop %%ebp;" \
180 "add $0x04, %%esp;" : \
181 "=a"(eax), \
182 "=b"(ebx), \
183 "=c"(ecx), \
184 "=d"(edx), \
185 "=S"(si), \
186 "=D"(di) : \
187 "a"(magic), \
188 "b"(cmd), \
189 "c"(in_ecx), \
190 "d"(flags), \
191 "S"(in_si), \
192 "D"(in_di), \
193 "m"(bp) : \
194 "memory", "cc"); \
195})
196
197
198#define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di, \
199 flags, magic, bp, \
200 eax, ebx, ecx, edx, si, di) \
201({ \
202 asm volatile ("push %12;" \
203 "push %%ebp;" \
204 "mov 0x04(%%esp), %%ebp;" \
205 VMWARE_HYPERCALL_HB_IN \
206 "pop %%ebp;" \
207 "add $0x04, %%esp;" : \
208 "=a"(eax), \
209 "=b"(ebx), \
210 "=c"(ecx), \
211 "=d"(edx), \
212 "=S"(si), \
213 "=D"(di) : \
214 "a"(magic), \
215 "b"(cmd), \
216 "c"(in_ecx), \
217 "d"(flags), \
218 "S"(in_si), \
219 "D"(in_di), \
220 "m"(bp) : \
221 "memory", "cc"); \
222})
223#endif /* defined(__i386__) */
224
225#endif /* defined(__i386__) || defined(__x86_64__) */
226
227#endif /* _VMWGFX_MSG_X86_H */