| 1 | /* $Id: HGSMIBuffers.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VirtualBox Video driver, common code - HGSMI buffer management.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2024 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * Permission is hereby granted, free of charge, to any person
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| 10 | * obtaining a copy of this software and associated documentation
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| 11 | * files (the "Software"), to deal in the Software without
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| 12 | * restriction, including without limitation the rights to use,
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| 13 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 14 | * copies of the Software, and to permit persons to whom the
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| 15 | * Software is furnished to do so, subject to the following
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| 16 | * conditions:
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| 17 | *
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| 18 | * The above copyright notice and this permission notice shall be
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| 19 | * included in all copies or substantial portions of the Software.
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| 20 | *
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| 21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 22 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 23 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 24 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 25 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 26 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 27 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 28 | * OTHER DEALINGS IN THE SOFTWARE.
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| 29 | */
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| 30 |
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| 31 | #include <VBoxVideoGuest.h>
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| 32 | #include <VBoxVideoVBE.h>
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| 33 | #include <VBoxVideoIPRT.h>
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| 34 |
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| 35 | /**
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| 36 | * Set up the HGSMI guest-to-host command context.
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| 37 | * @returns iprt status value
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| 38 | * @param pCtx the context to set up
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| 39 | * @param pvGuestHeapMemory a pointer to the mapped backing memory for
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| 40 | * the guest heap
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| 41 | * @param cbGuestHeapMemory the size of the backing memory area
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| 42 | * @param offVRAMGuestHeapMemory the offset of the memory pointed to by
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| 43 | * @a pvGuestHeapMemory within the video RAM
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| 44 | * @param pEnv HGSMI environment.
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| 45 | */
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| 46 | DECLHIDDEN(int) VBoxHGSMISetupGuestContext(PHGSMIGUESTCOMMANDCONTEXT pCtx,
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| 47 | void *pvGuestHeapMemory,
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| 48 | uint32_t cbGuestHeapMemory,
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| 49 | uint32_t offVRAMGuestHeapMemory,
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| 50 | const HGSMIENV *pEnv)
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| 51 | {
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| 52 | /** @todo should we be using a fixed ISA port value here? */
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| 53 | pCtx->port = (RTIOPORT)VGA_PORT_HGSMI_GUEST;
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| 54 | #ifdef VBOX_WDDM_MINIPORT
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| 55 | return VBoxSHGSMIInit(&pCtx->heapCtx, pvGuestHeapMemory,
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| 56 | cbGuestHeapMemory, offVRAMGuestHeapMemory, pEnv);
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| 57 | #else
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| 58 | return HGSMIHeapSetup(&pCtx->heapCtx, pvGuestHeapMemory,
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| 59 | cbGuestHeapMemory, offVRAMGuestHeapMemory, pEnv);
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| 60 | #endif
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| 61 | }
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| 62 |
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| 63 |
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| 64 | /**
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| 65 | * Allocate and initialise a command descriptor in the guest heap for a
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| 66 | * guest-to-host command.
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| 67 | *
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| 68 | * @returns pointer to the descriptor's command data buffer
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| 69 | * @param pCtx the context containing the heap to be used
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| 70 | * @param cbData the size of the command data to go into the descriptor
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| 71 | * @param u8Ch the HGSMI channel to be used, set to the descriptor
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| 72 | * @param u16Op the HGSMI command to be sent, set to the descriptor
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| 73 | */
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| 74 | DECLHIDDEN(void RT_UNTRUSTED_VOLATILE_HOST *) VBoxHGSMIBufferAlloc(PHGSMIGUESTCOMMANDCONTEXT pCtx,
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| 75 | HGSMISIZE cbData,
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| 76 | uint8_t u8Ch,
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| 77 | uint16_t u16Op)
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| 78 | {
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| 79 | #ifdef VBOX_WDDM_MINIPORT
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| 80 | return VBoxSHGSMIHeapAlloc(&pCtx->heapCtx, cbData, u8Ch, u16Op);
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| 81 | #else
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| 82 | return HGSMIHeapAlloc(&pCtx->heapCtx, cbData, u8Ch, u16Op);
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| 83 | #endif
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| 84 | }
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| 85 |
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| 86 |
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| 87 | /**
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| 88 | * Free a descriptor allocated by @a VBoxHGSMIBufferAlloc.
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| 89 | *
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| 90 | * @param pCtx the context containing the heap used
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| 91 | * @param pvBuffer the pointer returned by @a VBoxHGSMIBufferAlloc
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| 92 | */
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| 93 | DECLHIDDEN(void) VBoxHGSMIBufferFree(PHGSMIGUESTCOMMANDCONTEXT pCtx, void RT_UNTRUSTED_VOLATILE_HOST *pvBuffer)
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| 94 | {
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| 95 | #ifdef VBOX_WDDM_MINIPORT
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| 96 | VBoxSHGSMIHeapFree(&pCtx->heapCtx, pvBuffer);
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| 97 | #else
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| 98 | HGSMIHeapFree(&pCtx->heapCtx, pvBuffer);
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| 99 | #endif
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| 100 | }
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| 101 |
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| 102 | /**
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| 103 | * Submit a command descriptor allocated by @a VBoxHGSMIBufferAlloc.
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| 104 | *
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| 105 | * @param pCtx the context containing the heap used
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| 106 | * @param pvBuffer the pointer returned by @a VBoxHGSMIBufferAlloc
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| 107 | */
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| 108 | DECLHIDDEN(int) VBoxHGSMIBufferSubmit(PHGSMIGUESTCOMMANDCONTEXT pCtx, void RT_UNTRUSTED_VOLATILE_HOST *pvBuffer)
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| 109 | {
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| 110 | /* Initialize the buffer and get the offset for port IO. */
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| 111 | HGSMIOFFSET offBuffer = HGSMIHeapBufferOffset(HGSMIGUESTCMDHEAP_GET(&pCtx->heapCtx), pvBuffer);
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| 112 |
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| 113 | Assert(offBuffer != HGSMIOFFSET_VOID);
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| 114 | if (offBuffer != HGSMIOFFSET_VOID)
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| 115 | {
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| 116 | /* Submit the buffer to the host. */
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| 117 | VBVO_PORT_WRITE_U32(pCtx->port, offBuffer);
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| 118 | /* Make the compiler aware that the host has changed memory. */
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| 119 | ASMCompilerBarrier();
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| 120 | return VINF_SUCCESS;
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| 121 | }
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| 122 |
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| 123 | return VERR_INVALID_PARAMETER;
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| 124 | }
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