1 /* SPDX-License-Identifier: GPL-2.0+ OR MIT */ 2 /************************************************************************** 3 * 4 * Copyright 2016 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_H 33 #define _VMWGFX_MSG_H 34 35 36 /** 37 * Hypervisor-specific bi-directional communication channel. Should never 38 * execute on bare metal hardware. The caller must make sure to check for 39 * supported hypervisor before using these macros. 40 * 41 * The last two parameters are both input and output and must be initialized. 42 * 43 * @cmd: [IN] Message Cmd 44 * @in_ebx: [IN] Message Len, through EBX 45 * @in_si: [IN] Input argument through SI, set to 0 if not used 46 * @in_di: [IN] Input argument through DI, set ot 0 if not used 47 * @port_num: [IN] port number + [channel id] 48 * @magic: [IN] hypervisor magic value 49 * @eax: [OUT] value of EAX register 50 * @ebx: [OUT] e.g. status from an HB message status command 51 * @ecx: [OUT] e.g. status from a non-HB message status command 52 * @edx: [OUT] e.g. channel id 53 * @si: [OUT] 54 * @di: [OUT] 55 */ 56 #define VMW_PORT(cmd, in_ebx, in_si, in_di, \ 57 port_num, magic, \ 58 eax, ebx, ecx, edx, si, di) \ 59 ({ \ 60 asm volatile ("inl %%dx, %%eax;" : \ 61 "=a"(eax), \ 62 "=b"(ebx), \ 63 "=c"(ecx), \ 64 "=d"(edx), \ 65 "=S"(si), \ 66 "=D"(di) : \ 67 "a"(magic), \ 68 "b"(in_ebx), \ 69 "c"(cmd), \ 70 "d"(port_num), \ 71 "S"(in_si), \ 72 "D"(in_di) : \ 73 "memory"); \ 74 }) 75 76 77 /** 78 * Hypervisor-specific bi-directional communication channel. Should never 79 * execute on bare metal hardware. The caller must make sure to check for 80 * supported hypervisor before using these macros. 81 * 82 * The last 3 parameters are both input and output and must be initialized. 83 * 84 * @cmd: [IN] Message Cmd 85 * @in_ecx: [IN] Message Len, through ECX 86 * @in_si: [IN] Input argument through SI, set to 0 if not used 87 * @in_di: [IN] Input argument through DI, set to 0 if not used 88 * @port_num: [IN] port number + [channel id] 89 * @magic: [IN] hypervisor magic value 90 * @bp: [IN] 91 * @eax: [OUT] value of EAX register 92 * @ebx: [OUT] e.g. status from an HB message status command 93 * @ecx: [OUT] e.g. status from a non-HB message status command 94 * @edx: [OUT] e.g. channel id 95 * @si: [OUT] 96 * @di: [OUT] 97 */ 98 #ifdef __x86_64__ 99 100 #define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di, \ 101 port_num, magic, bp, \ 102 eax, ebx, ecx, edx, si, di) \ 103 ({ \ 104 asm volatile ("push %%rbp;" \ 105 "mov %12, %%rbp;" \ 106 "rep outsb;" \ 107 "pop %%rbp;" : \ 108 "=a"(eax), \ 109 "=b"(ebx), \ 110 "=c"(ecx), \ 111 "=d"(edx), \ 112 "=S"(si), \ 113 "=D"(di) : \ 114 "a"(magic), \ 115 "b"(cmd), \ 116 "c"(in_ecx), \ 117 "d"(port_num), \ 118 "S"(in_si), \ 119 "D"(in_di), \ 120 "r"(bp) : \ 121 "memory", "cc"); \ 122 }) 123 124 125 #define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di, \ 126 port_num, magic, bp, \ 127 eax, ebx, ecx, edx, si, di) \ 128 ({ \ 129 asm volatile ("push %%rbp;" \ 130 "mov %12, %%rbp;" \ 131 "rep insb;" \ 132 "pop %%rbp" : \ 133 "=a"(eax), \ 134 "=b"(ebx), \ 135 "=c"(ecx), \ 136 "=d"(edx), \ 137 "=S"(si), \ 138 "=D"(di) : \ 139 "a"(magic), \ 140 "b"(cmd), \ 141 "c"(in_ecx), \ 142 "d"(port_num), \ 143 "S"(in_si), \ 144 "D"(in_di), \ 145 "r"(bp) : \ 146 "memory", "cc"); \ 147 }) 148 149 #else 150 151 /* 152 * In the 32-bit version of this macro, we store bp in a memory location 153 * because we've ran out of registers. 154 * Now we can't reference that memory location while we've modified 155 * %esp or %ebp, so we first push it on the stack, just before we push 156 * %ebp, and then when we need it we read it from the stack where we 157 * just pushed it. 158 */ 159 #define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di, \ 160 port_num, magic, bp, \ 161 eax, ebx, ecx, edx, si, di) \ 162 ({ \ 163 asm volatile ("push %12;" \ 164 "push %%ebp;" \ 165 "mov 0x04(%%esp), %%ebp;" \ 166 "rep outsb;" \ 167 "pop %%ebp;" \ 168 "add $0x04, %%esp;" : \ 169 "=a"(eax), \ 170 "=b"(ebx), \ 171 "=c"(ecx), \ 172 "=d"(edx), \ 173 "=S"(si), \ 174 "=D"(di) : \ 175 "a"(magic), \ 176 "b"(cmd), \ 177 "c"(in_ecx), \ 178 "d"(port_num), \ 179 "S"(in_si), \ 180 "D"(in_di), \ 181 "m"(bp) : \ 182 "memory", "cc"); \ 183 }) 184 185 186 #define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di, \ 187 port_num, magic, bp, \ 188 eax, ebx, ecx, edx, si, di) \ 189 ({ \ 190 asm volatile ("push %12;" \ 191 "push %%ebp;" \ 192 "mov 0x04(%%esp), %%ebp;" \ 193 "rep insb;" \ 194 "pop %%ebp;" \ 195 "add $0x04, %%esp;" : \ 196 "=a"(eax), \ 197 "=b"(ebx), \ 198 "=c"(ecx), \ 199 "=d"(edx), \ 200 "=S"(si), \ 201 "=D"(di) : \ 202 "a"(magic), \ 203 "b"(cmd), \ 204 "c"(in_ecx), \ 205 "d"(port_num), \ 206 "S"(in_si), \ 207 "D"(in_di), \ 208 "m"(bp) : \ 209 "memory", "cc"); \ 210 }) 211 #endif /* #if __x86_64__ */ 212 213 #endif 214
