201 lines
5.1 KiB
C
201 lines
5.1 KiB
C
/*
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* Copyright (C) 2016, VMware, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* Based on code from vmware.c and vmmouse.c.
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* Author:
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* Sinclair Yeh <syeh@vmware.com>
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*/
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#ifndef _VMWGFX_MSG_H
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#define _VMWGFX_MSG_H
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/**
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* Hypervisor-specific bi-directional communication channel. Should never
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* execute on bare metal hardware. The caller must make sure to check for
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* supported hypervisor before using these macros.
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*
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* The last two parameters are both input and output and must be initialized.
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*
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* @cmd: [IN] Message Cmd
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* @in_ebx: [IN] Message Len, through EBX
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* @in_si: [IN] Input argument through SI, set to 0 if not used
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* @in_di: [IN] Input argument through DI, set ot 0 if not used
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* @port_num: [IN] port number + [channel id]
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* @magic: [IN] hypervisor magic value
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* @eax: [OUT] value of EAX register
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* @ebx: [OUT] e.g. status from an HB message status command
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* @ecx: [OUT] e.g. status from a non-HB message status command
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* @edx: [OUT] e.g. channel id
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* @si: [OUT]
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* @di: [OUT]
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*/
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#define VMW_PORT(cmd, in_ebx, in_si, in_di, \
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port_num, magic, \
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eax, ebx, ecx, edx, si, di) \
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({ \
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asm volatile ("inl %%dx, %%eax;" : \
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"=a"(eax), \
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"=b"(ebx), \
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"=c"(ecx), \
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"=d"(edx), \
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"=S"(si), \
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"=D"(di) : \
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"a"(magic), \
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"b"(in_ebx), \
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"c"(cmd), \
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"d"(port_num), \
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"S"(in_si), \
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"D"(in_di) : \
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"memory"); \
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})
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/**
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* Hypervisor-specific bi-directional communication channel. Should never
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* execute on bare metal hardware. The caller must make sure to check for
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* supported hypervisor before using these macros.
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*
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* The last 3 parameters are both input and output and must be initialized.
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*
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* @cmd: [IN] Message Cmd
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* @in_ecx: [IN] Message Len, through ECX
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* @in_si: [IN] Input argument through SI, set to 0 if not used
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* @in_di: [IN] Input argument through DI, set to 0 if not used
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* @port_num: [IN] port number + [channel id]
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* @magic: [IN] hypervisor magic value
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* @bp: [IN]
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* @eax: [OUT] value of EAX register
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* @ebx: [OUT] e.g. status from an HB message status command
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* @ecx: [OUT] e.g. status from a non-HB message status command
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* @edx: [OUT] e.g. channel id
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* @si: [OUT]
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* @di: [OUT]
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*/
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#ifdef __x86_64__
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#define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di, \
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port_num, magic, bp, \
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eax, ebx, ecx, edx, si, di) \
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({ \
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asm volatile ("push %%rbp;" \
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"mov %12, %%rbp;" \
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"rep outsb;" \
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"pop %%rbp;" : \
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"=a"(eax), \
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"=b"(ebx), \
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"=c"(ecx), \
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"=d"(edx), \
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"=S"(si), \
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"=D"(di) : \
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"a"(magic), \
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"b"(cmd), \
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"c"(in_ecx), \
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"d"(port_num), \
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"S"(in_si), \
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"D"(in_di), \
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"r"(bp) : \
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"memory", "cc"); \
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})
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#define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di, \
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port_num, magic, bp, \
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eax, ebx, ecx, edx, si, di) \
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({ \
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asm volatile ("push %%rbp;" \
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"mov %12, %%rbp;" \
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"rep insb;" \
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"pop %%rbp" : \
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"=a"(eax), \
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"=b"(ebx), \
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"=c"(ecx), \
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"=d"(edx), \
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"=S"(si), \
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"=D"(di) : \
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"a"(magic), \
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"b"(cmd), \
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"c"(in_ecx), \
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"d"(port_num), \
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"S"(in_si), \
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"D"(in_di), \
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"r"(bp) : \
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"memory", "cc"); \
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})
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#else
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/*
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* In the 32-bit version of this macro, we store bp in a memory location
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* because we've ran out of registers.
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* Now we can't reference that memory location while we've modified
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* %esp or %ebp, so we first push it on the stack, just before we push
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* %ebp, and then when we need it we read it from the stack where we
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* just pushed it.
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*/
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#define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di, \
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port_num, magic, bp, \
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eax, ebx, ecx, edx, si, di) \
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({ \
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asm volatile ("push %12;" \
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"push %%ebp;" \
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"mov 0x04(%%esp), %%ebp;" \
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"rep outsb;" \
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"pop %%ebp;" \
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"add $0x04, %%esp;" : \
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"=a"(eax), \
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"=b"(ebx), \
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"=c"(ecx), \
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"=d"(edx), \
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"=S"(si), \
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"=D"(di) : \
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"a"(magic), \
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"b"(cmd), \
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"c"(in_ecx), \
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"d"(port_num), \
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"S"(in_si), \
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"D"(in_di), \
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"m"(bp) : \
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"memory", "cc"); \
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})
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#define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di, \
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port_num, magic, bp, \
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eax, ebx, ecx, edx, si, di) \
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({ \
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asm volatile ("push %12;" \
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"push %%ebp;" \
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"mov 0x04(%%esp), %%ebp;" \
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"rep insb;" \
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"pop %%ebp;" \
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"add $0x04, %%esp;" : \
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"=a"(eax), \
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"=b"(ebx), \
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"=c"(ecx), \
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"=d"(edx), \
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"=S"(si), \
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"=D"(di) : \
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"a"(magic), \
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"b"(cmd), \
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"c"(in_ecx), \
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"d"(port_num), \
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"S"(in_si), \
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"D"(in_di), \
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"m"(bp) : \
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"memory", "cc"); \
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})
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#endif /* #if __x86_64__ */
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#endif
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