drivers/gpu/drm/vmwgfx/vmwgfx_msg_x86.h

   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 ("push %%rbp;"                     \
 109                 "mov %12, %%rbp;"                       \
 110                 VMWARE_HYPERCALL_HB_OUT                 \
 111                 "pop %%rbp;" :                          \
 112                 "=a"(eax),                              \
 113                 "=b"(ebx),                              \
 114                 "=c"(ecx),                              \
 115                 "=d"(edx),                              \
 116                 "=S"(si),                               \
 117                 "=D"(di) :                              \
 118                 "a"(magic),                             \
 119                 "b"(cmd),                               \
 120                 "c"(in_ecx),                            \
 121                 "d"(flags),                             \
 122                 "S"(in_si),                             \
 123                 "D"(in_di),                             \
 124                 "r"(bp) :                               \
 125                 "memory", "cc");                        \
 126 })
 127
 128
 129 #define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di,       \
 130                        flags, magic, bp,                \
 131                        eax, ebx, ecx, edx, si, di)      \
 132 ({                                                      \
 133         asm volatile ("push %%rbp;"                     \
 134                 "mov %12, %%rbp;"                       \
 135                 VMWARE_HYPERCALL_HB_IN                  \
 136                 "pop %%rbp" :                           \
 137                 "=a"(eax),                              \
 138                 "=b"(ebx),                              \
 139                 "=c"(ecx),                              \
 140                 "=d"(edx),                              \
 141                 "=S"(si),                               \
 142                 "=D"(di) :                              \
 143                 "a"(magic),                             \
 144                 "b"(cmd),                               \
 145                 "c"(in_ecx),                            \
 146                 "d"(flags),                             \
 147                 "S"(in_si),                             \
 148                 "D"(in_di),                             \
 149                 "r"(bp) :                               \
 150                 "memory", "cc");                        \
 151 })
 152
 153 #elif defined(__i386__)
 154
 155 /*
 156  * In the 32-bit version of this macro, we store bp in a memory location
 157  * because we've ran out of registers.
 158  * Now we can't reference that memory location while we've modified
 159  * %esp or %ebp, so we first push it on the stack, just before we push
 160  * %ebp, and then when we need it we read it from the stack where we
 161  * just pushed it.
 162  */
 163 #define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di,      \
 164                         flags, magic, bp,               \
 165                         eax, ebx, ecx, edx, si, di)     \
 166 ({                                                      \
 167         asm volatile ("push %12;"                       \
 168                 "push %%ebp;"                           \
 169                 "mov 0x04(%%esp), %%ebp;"               \
 170                 VMWARE_HYPERCALL_HB_OUT                 \
 171                 "pop %%ebp;"                            \
 172                 "add $0x04, %%esp;" :                   \
 173                 "=a"(eax),                              \
 174                 "=b"(ebx),                              \
 175                 "=c"(ecx),                              \
 176                 "=d"(edx),                              \
 177                 "=S"(si),                               \
 178                 "=D"(di) :                              \
 179                 "a"(magic),                             \
 180                 "b"(cmd),                               \
 181                 "c"(in_ecx),                            \
 182                 "d"(flags),                             \
 183                 "S"(in_si),                             \
 184                 "D"(in_di),                             \
 185                 "m"(bp) :                               \
 186                 "memory", "cc");                        \
 187 })
 188
 189
 190 #define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di,       \
 191                        flags, magic, bp,                \
 192                        eax, ebx, ecx, edx, si, di)      \
 193 ({                                                      \
 194         asm volatile ("push %12;"                       \
 195                 "push %%ebp;"                           \
 196                 "mov 0x04(%%esp), %%ebp;"               \
 197                 VMWARE_HYPERCALL_HB_IN                  \
 198                 "pop %%ebp;"                            \
 199                 "add $0x04, %%esp;" :                   \
 200                 "=a"(eax),                              \
 201                 "=b"(ebx),                              \
 202                 "=c"(ecx),                              \
 203                 "=d"(edx),                              \
 204                 "=S"(si),                               \
 205                 "=D"(di) :                              \
 206                 "a"(magic),                             \
 207                 "b"(cmd),                               \
 208                 "c"(in_ecx),                            \
 209                 "d"(flags),                             \
 210                 "S"(in_si),                             \
 211                 "D"(in_di),                             \
 212                 "m"(bp) :                               \
 213                 "memory", "cc");                        \
 214 })
 215 #endif /* defined(__i386__) */
 216
 217 #endif /* defined(__i386__) || defined(__x86_64__) */
 218
 219 #endif /* _VMWGFX_MSG_X86_H */