diff options
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_msg.h')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_msg.h | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.h b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.h new file mode 100644 index 000000000..557a033fb --- /dev/null +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.h @@ -0,0 +1,191 @@ +/* + * Copyright (C) 2016, VMware, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * Based on code from vmware.c and vmmouse.c. + * Author: + * Sinclair Yeh <syeh@vmware.com> + */ +#ifndef _VMWGFX_MSG_H +#define _VMWGFX_MSG_H + + +/** + * Hypervisor-specific bi-directional communication channel. Should never + * execute on bare metal hardware. The caller must make sure to check for + * supported hypervisor before using these macros. + * + * The last two parameters are both input and output and must be initialized. + * + * @cmd: [IN] Message Cmd + * @in_ebx: [IN] Message Len, through EBX + * @in_si: [IN] Input argument through SI, set to 0 if not used + * @in_di: [IN] Input argument through DI, set ot 0 if not used + * @port_num: [IN] port number + [channel id] + * @magic: [IN] hypervisor magic value + * @eax: [OUT] value of EAX register + * @ebx: [OUT] e.g. status from an HB message status command + * @ecx: [OUT] e.g. status from a non-HB message status command + * @edx: [OUT] e.g. channel id + * @si: [OUT] + * @di: [OUT] + */ +#define VMW_PORT(cmd, in_ebx, in_si, in_di, \ + port_num, magic, \ + eax, ebx, ecx, edx, si, di) \ +({ \ + asm volatile ("inl %%dx, %%eax;" : \ + "=a"(eax), \ + "=b"(ebx), \ + "=c"(ecx), \ + "=d"(edx), \ + "=S"(si), \ + "=D"(di) : \ + "a"(magic), \ + "b"(in_ebx), \ + "c"(cmd), \ + "d"(port_num), \ + "S"(in_si), \ + "D"(in_di) : \ + "memory"); \ +}) + + +/** + * Hypervisor-specific bi-directional communication channel. Should never + * execute on bare metal hardware. The caller must make sure to check for + * supported hypervisor before using these macros. + * + * The last 3 parameters are both input and output and must be initialized. + * + * @cmd: [IN] Message Cmd + * @in_ecx: [IN] Message Len, through ECX + * @in_si: [IN] Input argument through SI, set to 0 if not used + * @in_di: [IN] Input argument through DI, set to 0 if not used + * @port_num: [IN] port number + [channel id] + * @magic: [IN] hypervisor magic value + * @bp: [IN] + * @eax: [OUT] value of EAX register + * @ebx: [OUT] e.g. status from an HB message status command + * @ecx: [OUT] e.g. status from a non-HB message status command + * @edx: [OUT] e.g. channel id + * @si: [OUT] + * @di: [OUT] + */ +#ifdef __x86_64__ + +#define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di, \ + port_num, magic, bp, \ + eax, ebx, ecx, edx, si, di) \ +({ \ + asm volatile ("push %%rbp;" \ + "mov %12, %%rbp;" \ + "rep outsb;" \ + "pop %%rbp;" : \ + "=a"(eax), \ + "=b"(ebx), \ + "=c"(ecx), \ + "=d"(edx), \ + "=S"(si), \ + "=D"(di) : \ + "a"(magic), \ + "b"(cmd), \ + "c"(in_ecx), \ + "d"(port_num), \ + "S"(in_si), \ + "D"(in_di), \ + "r"(bp) : \ + "memory", "cc"); \ +}) + + +#define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di, \ + port_num, magic, bp, \ + eax, ebx, ecx, edx, si, di) \ +({ \ + asm volatile ("push %%rbp;" \ + "mov %12, %%rbp;" \ + "rep insb;" \ + "pop %%rbp" : \ + "=a"(eax), \ + "=b"(ebx), \ + "=c"(ecx), \ + "=d"(edx), \ + "=S"(si), \ + "=D"(di) : \ + "a"(magic), \ + "b"(cmd), \ + "c"(in_ecx), \ + "d"(port_num), \ + "S"(in_si), \ + "D"(in_di), \ + "r"(bp) : \ + "memory", "cc"); \ +}) + +#else + +/* In the 32-bit version of this macro, we use "m" because there is no + * more register left for bp + */ +#define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di, \ + port_num, magic, bp, \ + eax, ebx, ecx, edx, si, di) \ +({ \ + asm volatile ("push %%ebp;" \ + "mov %12, %%ebp;" \ + "rep outsb;" \ + "pop %%ebp;" : \ + "=a"(eax), \ + "=b"(ebx), \ + "=c"(ecx), \ + "=d"(edx), \ + "=S"(si), \ + "=D"(di) : \ + "a"(magic), \ + "b"(cmd), \ + "c"(in_ecx), \ + "d"(port_num), \ + "S"(in_si), \ + "D"(in_di), \ + "m"(bp) : \ + "memory", "cc"); \ +}) + + +#define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di, \ + port_num, magic, bp, \ + eax, ebx, ecx, edx, si, di) \ +({ \ + asm volatile ("push %%ebp;" \ + "mov %12, %%ebp;" \ + "rep insb;" \ + "pop %%ebp" : \ + "=a"(eax), \ + "=b"(ebx), \ + "=c"(ecx), \ + "=d"(edx), \ + "=S"(si), \ + "=D"(di) : \ + "a"(magic), \ + "b"(cmd), \ + "c"(in_ecx), \ + "d"(port_num), \ + "S"(in_si), \ + "D"(in_di), \ + "m"(bp) : \ + "memory", "cc"); \ +}) +#endif /* #if __x86_64__ */ + +#endif |