1 files changed, 124 insertions, 0 deletions
diff --git a/src/VBox/Additions/common/VBoxVideo/HGSMIBuffers.cpp b/src/VBox/Additions/common/VBoxVideo/HGSMIBuffers.cpp
new file mode 100644
index 00000000..84a35a4a
--- /dev/null
+++ b/src/VBox/Additions/common/VBoxVideo/HGSMIBuffers.cpp
@@ -0,0 +1,124 @@
+/* $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;
+}