214 lines
5.9 KiB
C
214 lines
5.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0+ OR MIT */
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/**************************************************************************
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*
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* Copyright 2016 VMware, Inc., Palo Alto, CA., USA
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************
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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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