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/* $Id: HGSMIBuffers.cpp $ */
/** @file
* VirtualBox Video driver, common code - HGSMI buffer management.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <VBoxVideoGuest.h>
#include <VBoxVideoVBE.h>
#include <VBoxVideoIPRT.h>
/**
* Set up the HGSMI guest-to-host command context.
* @returns iprt status value
* @param pCtx the context to set up
* @param pvGuestHeapMemory a pointer to the mapped backing memory for
* the guest heap
* @param cbGuestHeapMemory the size of the backing memory area
* @param offVRAMGuestHeapMemory the offset of the memory pointed to by
* @a pvGuestHeapMemory within the video RAM
* @param pEnv HGSMI environment.
*/
DECLHIDDEN(int) VBoxHGSMISetupGuestContext(PHGSMIGUESTCOMMANDCONTEXT pCtx,
void *pvGuestHeapMemory,
uint32_t cbGuestHeapMemory,
uint32_t offVRAMGuestHeapMemory,
const HGSMIENV *pEnv)
{
/** @todo should we be using a fixed ISA port value here? */
pCtx->port = (RTIOPORT)VGA_PORT_HGSMI_GUEST;
#ifdef VBOX_WDDM_MINIPORT
return VBoxSHGSMIInit(&pCtx->heapCtx, pvGuestHeapMemory,
cbGuestHeapMemory, offVRAMGuestHeapMemory, pEnv);
#else
return HGSMIHeapSetup(&pCtx->heapCtx, pvGuestHeapMemory,
cbGuestHeapMemory, offVRAMGuestHeapMemory, pEnv);
#endif
}
/**
* Allocate and initialise a command descriptor in the guest heap for a
* guest-to-host command.
*
* @returns pointer to the descriptor's command data buffer
* @param pCtx the context containing the heap to be used
* @param cbData the size of the command data to go into the descriptor
* @param u8Ch the HGSMI channel to be used, set to the descriptor
* @param u16Op the HGSMI command to be sent, set to the descriptor
*/
DECLHIDDEN(void RT_UNTRUSTED_VOLATILE_HOST *) VBoxHGSMIBufferAlloc(PHGSMIGUESTCOMMANDCONTEXT pCtx,
HGSMISIZE cbData,
uint8_t u8Ch,
uint16_t u16Op)
{
#ifdef VBOX_WDDM_MINIPORT
return VBoxSHGSMIHeapAlloc(&pCtx->heapCtx, cbData, u8Ch, u16Op);
#else
return HGSMIHeapAlloc(&pCtx->heapCtx, cbData, u8Ch, u16Op);
#endif
}
/**
* Free a descriptor allocated by @a VBoxHGSMIBufferAlloc.
*
* @param pCtx the context containing the heap used
* @param pvBuffer the pointer returned by @a VBoxHGSMIBufferAlloc
*/
DECLHIDDEN(void) VBoxHGSMIBufferFree(PHGSMIGUESTCOMMANDCONTEXT pCtx, void RT_UNTRUSTED_VOLATILE_HOST *pvBuffer)
{
#ifdef VBOX_WDDM_MINIPORT
VBoxSHGSMIHeapFree(&pCtx->heapCtx, pvBuffer);
#else
HGSMIHeapFree(&pCtx->heapCtx, pvBuffer);
#endif
}
/**
* Submit a command descriptor allocated by @a VBoxHGSMIBufferAlloc.
*
* @param pCtx the context containing the heap used
* @param pvBuffer the pointer returned by @a VBoxHGSMIBufferAlloc
*/
DECLHIDDEN(int) VBoxHGSMIBufferSubmit(PHGSMIGUESTCOMMANDCONTEXT pCtx, void RT_UNTRUSTED_VOLATILE_HOST *pvBuffer)
{
/* Initialize the buffer and get the offset for port IO. */
HGSMIOFFSET offBuffer = HGSMIHeapBufferOffset(HGSMIGUESTCMDHEAP_GET(&pCtx->heapCtx), pvBuffer);
Assert(offBuffer != HGSMIOFFSET_VOID);
if (offBuffer != HGSMIOFFSET_VOID)
{
/* Submit the buffer to the host. */
VBVO_PORT_WRITE_U32(pCtx->port, offBuffer);
/* Make the compiler aware that the host has changed memory. */
ASMCompilerBarrier();
return VINF_SUCCESS;
}
return VERR_INVALID_PARAMETER;
}
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