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/*
* 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 store bp in a memory location
* because we've ran out of registers.
* Now we can't reference that memory location while we've modified
* %esp or %ebp, so we first push it on the stack, just before we push
* %ebp, and then when we need it we read it from the stack where we
* just pushed it.
*/
#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 %12;" \
"push %%ebp;" \
"mov 0x04(%%esp), %%ebp;" \
"rep outsb;" \
"pop %%ebp;" \
"add $0x04, %%esp;" : \
"=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 %12;" \
"push %%ebp;" \
"mov 0x04(%%esp), %%ebp;" \
"rep insb;" \
"pop %%ebp;" \
"add $0x04, %%esp;" : \
"=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
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