diff options
Diffstat (limited to 'src/VBox/Additions/common/VBoxVideo/HGSMIHostCmd.cpp')
| -rw-r--r-- | src/VBox/Additions/common/VBoxVideo/HGSMIHostCmd.cpp | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/src/VBox/Additions/common/VBoxVideo/HGSMIHostCmd.cpp b/src/VBox/Additions/common/VBoxVideo/HGSMIHostCmd.cpp new file mode 100644 index 00000000..528c90c1 --- /dev/null +++ b/src/VBox/Additions/common/VBoxVideo/HGSMIHostCmd.cpp @@ -0,0 +1,245 @@ +/* $Id: HGSMIHostCmd.cpp $ */ +/** @file + * VirtualBox Video driver, common code - HGSMI host-to-guest communication. + */ + +/* + * Copyright (C) 2006-2022 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> +#include <HGSMIHostCmd.h> + +/** + * Initialise the host context structure. + * + * @param pCtx the context structure to initialise + * @param pvBaseMapping where the basic HGSMI structures are mapped at + * @param offHostFlags the offset of the host flags into the basic HGSMI + * structures + * @param pvHostAreaMapping where the area for the host heap is mapped at + * @param offVRAMHostArea offset of the host heap area into VRAM + * @param cbHostArea size in bytes of the host heap area + */ +DECLHIDDEN(void) VBoxHGSMISetupHostContext(PHGSMIHOSTCOMMANDCONTEXT pCtx, + void *pvBaseMapping, + uint32_t offHostFlags, + void *pvHostAreaMapping, + uint32_t offVRAMHostArea, + uint32_t cbHostArea) +{ + uint8_t *pu8HostFlags = ((uint8_t *)pvBaseMapping) + offHostFlags; + pCtx->pfHostFlags = (HGSMIHOSTFLAGS *)pu8HostFlags; + /** @todo should we really be using a fixed ISA port value here? */ + pCtx->port = (RTIOPORT)VGA_PORT_HGSMI_HOST; + HGSMIAreaInitialize(&pCtx->areaCtx, pvHostAreaMapping, cbHostArea, + offVRAMHostArea); +} + + +/** Send completion notification to the host for the command located at offset + * @a offt into the host command buffer. */ +static void HGSMINotifyHostCmdComplete(PHGSMIHOSTCOMMANDCONTEXT pCtx, HGSMIOFFSET offt) +{ + VBVO_PORT_WRITE_U32(pCtx->port, offt); +} + + +/** + * Inform the host that a command has been handled. + * + * @param pCtx the context containing the heap to be used + * @param pvMem pointer into the heap as mapped in @a pCtx to the command to + * be completed + */ +DECLHIDDEN(void) VBoxHGSMIHostCmdComplete(PHGSMIHOSTCOMMANDCONTEXT pCtx, void RT_UNTRUSTED_VOLATILE_HOST *pvMem) +{ + HGSMIBUFFERHEADER RT_UNTRUSTED_VOLATILE_GUEST *pHdr = HGSMIBufferHeaderFromData(pvMem); + HGSMIOFFSET offMem = HGSMIPointerToOffset(&pCtx->areaCtx, pHdr); + Assert(offMem != HGSMIOFFSET_VOID); + if (offMem != HGSMIOFFSET_VOID) + HGSMINotifyHostCmdComplete(pCtx, offMem); +} + + +/** Submit an incoming host command to the appropriate handler. */ +static void hgsmiHostCmdProcess(PHGSMIHOSTCOMMANDCONTEXT pCtx, + HGSMIOFFSET offBuffer) +{ + int rc = HGSMIBufferProcess(&pCtx->areaCtx, &pCtx->channels, offBuffer); + Assert(!RT_FAILURE(rc)); + if(RT_FAILURE(rc)) + { + /* failure means the command was not submitted to the handler for some reason + * it's our responsibility to notify its completion in this case */ + HGSMINotifyHostCmdComplete(pCtx, offBuffer); + } + /* if the cmd succeeded it's responsibility of the callback to complete it */ +} + +/** Get the next command from the host. */ +static HGSMIOFFSET hgsmiGetHostBuffer(PHGSMIHOSTCOMMANDCONTEXT pCtx) +{ + return VBVO_PORT_READ_U32(pCtx->port); +} + + +/** Get and handle the next command from the host. */ +static void hgsmiHostCommandQueryProcess(PHGSMIHOSTCOMMANDCONTEXT pCtx) +{ + HGSMIOFFSET offset = hgsmiGetHostBuffer(pCtx); + AssertReturnVoid(offset != HGSMIOFFSET_VOID); + hgsmiHostCmdProcess(pCtx, offset); +} + + +/** Drain the host command queue. */ +DECLHIDDEN(void) VBoxHGSMIProcessHostQueue(PHGSMIHOSTCOMMANDCONTEXT pCtx) +{ + while (pCtx->pfHostFlags->u32HostFlags & HGSMIHOSTFLAGS_COMMANDS_PENDING) + { + if (!ASMAtomicCmpXchgBool(&pCtx->fHostCmdProcessing, true, false)) + return; + hgsmiHostCommandQueryProcess(pCtx); + ASMAtomicWriteBool(&pCtx->fHostCmdProcessing, false); + } +} + + +/** Tell the host about the location of the area of VRAM set aside for the host + * heap. */ +static int vboxHGSMIReportHostArea(PHGSMIGUESTCOMMANDCONTEXT pCtx, + uint32_t u32AreaOffset, uint32_t u32AreaSize) +{ + VBVAINFOHEAP *p; + int rc = VINF_SUCCESS; + + /* Allocate the IO buffer. */ + p = (VBVAINFOHEAP *)VBoxHGSMIBufferAlloc(pCtx, + sizeof (VBVAINFOHEAP), HGSMI_CH_VBVA, + VBVA_INFO_HEAP); + if (p) + { + /* Prepare data to be sent to the host. */ + p->u32HeapOffset = u32AreaOffset; + p->u32HeapSize = u32AreaSize; + rc = VBoxHGSMIBufferSubmit(pCtx, p); + /* Free the IO buffer. */ + VBoxHGSMIBufferFree(pCtx, p); + } + else + rc = VERR_NO_MEMORY; + return rc; +} + + +/** + * Get the information needed to map the area used by the host to send back + * requests. + * + * @param pCtx the context containing the heap to use + * @param cbVRAM how much video RAM is allocated to the device + * @param offVRAMBaseMapping the offset of the basic communication structures + * into the guest's VRAM + * @param poffVRAMHostArea where to store the offset into VRAM of the host + * heap area + * @param pcbHostArea where to store the size of the host heap area + */ +DECLHIDDEN(void) VBoxHGSMIGetHostAreaMapping(PHGSMIGUESTCOMMANDCONTEXT pCtx, + uint32_t cbVRAM, + uint32_t offVRAMBaseMapping, + uint32_t *poffVRAMHostArea, + uint32_t *pcbHostArea) +{ + uint32_t offVRAMHostArea = offVRAMBaseMapping, cbHostArea = 0; + + AssertPtrReturnVoid(poffVRAMHostArea); + AssertPtrReturnVoid(pcbHostArea); + VBoxQueryConfHGSMI(pCtx, VBOX_VBVA_CONF32_HOST_HEAP_SIZE, &cbHostArea); + if (cbHostArea != 0) + { + uint32_t cbHostAreaMaxSize = cbVRAM / 4; + /** @todo what is the idea of this? */ + if (cbHostAreaMaxSize >= VBVA_ADAPTER_INFORMATION_SIZE) + { + cbHostAreaMaxSize -= VBVA_ADAPTER_INFORMATION_SIZE; + } + if (cbHostArea > cbHostAreaMaxSize) + { + cbHostArea = cbHostAreaMaxSize; + } + /* Round up to 4096 bytes. */ + cbHostArea = (cbHostArea + 0xFFF) & ~0xFFF; + offVRAMHostArea = offVRAMBaseMapping - cbHostArea; + } + + *pcbHostArea = cbHostArea; + *poffVRAMHostArea = offVRAMHostArea; + // LogFunc(("offVRAMHostArea = 0x%08X, cbHostArea = 0x%08X\n", + // offVRAMHostArea, cbHostArea)); +} + + +/** + * Tell the host about the ways it can use to communicate back to us via an + * HGSMI command + * + * @returns iprt status value + * @param pCtx the context containing the heap to use + * @param offVRAMFlagsLocation where we wish the host to place its flags + * relative to the start of the VRAM + * @param fCaps additions HGSMI capabilities the guest + * supports + * @param offVRAMHostArea offset into VRAM of the host heap area + * @param cbHostArea size in bytes of the host heap area + */ +DECLHIDDEN(int) VBoxHGSMISendHostCtxInfo(PHGSMIGUESTCOMMANDCONTEXT pCtx, + HGSMIOFFSET offVRAMFlagsLocation, + uint32_t fCaps, + uint32_t offVRAMHostArea, + uint32_t cbHostArea) +{ + // Log(("VBoxVideo::vboxSetupAdapterInfo\n")); + + /* setup the flags first to ensure they are initialized by the time the + * host heap is ready */ + int rc = VBoxHGSMIReportFlagsLocation(pCtx, offVRAMFlagsLocation); + AssertRC(rc); + if (RT_SUCCESS(rc) && fCaps) + { + /* Inform about caps */ + rc = VBoxHGSMISendCapsInfo(pCtx, fCaps); + AssertRC(rc); + } + if (RT_SUCCESS (rc)) + { + /* Report the host heap location. */ + rc = vboxHGSMIReportHostArea(pCtx, offVRAMHostArea, cbHostArea); + AssertRC(rc); + } + // Log(("VBoxVideo::vboxSetupAdapterInfo finished rc = %d\n", rc)); + return rc; +} |