1 files changed, 148 insertions, 0 deletions
diff --git a/src/VBox/Additions/solaris/Virtio/VirtioRing-solaris.c b/src/VBox/Additions/solaris/Virtio/VirtioRing-solaris.c
new file mode 100644
index 00000000..004075c1
--- /dev/null
+++ b/src/VBox/Additions/solaris/Virtio/VirtioRing-solaris.c
@@ -0,0 +1,148 @@
+/* $Id: VirtioRing-solaris.c $ */
+/** @file
+ * VirtualBox Guest Additions: Virtio Driver for Solaris, Ring implementation.
+ */
+
+/*
+ * Copyright (C) 2010-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "Virtio-solaris.h"
+
+#include <iprt/asm.h>
+#include <iprt/cdefs.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/log.h>
+
+#include <sys/cmn_err.h>
+
+/**
+ * Returns the size of the ring in bytes given the number of elements and
+ * alignment requirements.
+ *
+ * @param cElements         Number of elements.
+ * @param Align             Alignment (must be a power of two).
+ *
+ * @return Size of the Virtio ring.
+ */
+size_t VirtioRingSize(uint64_t cElements, ulong_t Align)
+{
+    size_t cb = 0;
+    cb  = cElements * sizeof(VIRTIORINGDESC);   /* Ring descriptors. */
+    cb += 2 * sizeof(uint16_t);                 /* Available flags and index. */
+    cb += cElements * sizeof(uint16_t);         /* Available descriptors. */
+
+    size_t cbAlign = RT_ALIGN_Z(cb, Align);
+    cbAlign += 2 * sizeof(uint16_t);                    /* Used flags and index. */
+    cbAlign += cElements * sizeof(VIRTIORINGUSEDELEM);  /* Used descriptors. */
+
+    return cbAlign;
+}
+
+
+/**
+ * Initializes a ring of a queue. This associates the DMA virtual address
+ * with the Ring structure's "pRingDesc".
+ *
+ * @param pQueue            Pointer to the Virtio Queue.
+ * @param cDescs            Number of descriptors.
+ * @param virtBuf           Buffer associated with the ring.
+ * @param Align             Alignment (must be power of two).
+ */
+void VirtioRingInit(PVIRTIOQUEUE pQueue, uint_t cDescs, caddr_t virtBuf, ulong_t Align)
+{
+    PVIRTIORING pRing = &pQueue->Ring;
+    pRing->cDesc          = cDescs;
+    pRing->pRingDesc      = (void *)virtBuf;
+    pRing->pRingAvail     = (PVIRTIORINGAVAIL)(virtBuf + (cDescs * sizeof(pRing->pRingDesc[0])));
+    pRing->pRingUsedElem  = RT_ALIGN_PT(pRing->pRingAvail + RT_UOFFSETOF_DYN(VIRTIORINGAVAIL, aRings[pQueue->Ring.cDesc]), Align,
+                                        PVIRTIORINGUSEDELEM);
+
+    for (uint_t i = 0; i < pRing->cDesc - 1; i++)
+        pRing->pRingDesc[i].Next = i + 1;
+
+    pQueue->FreeHeadIndex = 0;
+
+    cmn_err(CE_NOTE, "cDesc=%u pRingDesc=%p pRingAvail=%p\n", pRing->cDesc, pRing->pRingDesc, pRing->pRingAvail);
+}
+
+
+/**
+ * Push a buffer into the ring.
+ *
+ * @param pQueue            Pointer to the Virtio queue.
+ * @param physBuf           Physical address of the buffer.
+ * @param cbBuf             Size of the buffer in bytes.
+ * @param fFlags            Buffer flags, see VIRTIO_FLAGS_RING_DESC_*.
+ *
+ * @return IPRT error code.
+ */
+int VirtioRingPush(PVIRTIOQUEUE pQueue, paddr_t physBuf, uint32_t cbBuf, uint16_t fFlags)
+{
+    /*
+     * Claim a slot, fill the buffer and move head pointer.
+     */
+    uint_t FreeIndex          = pQueue->FreeHeadIndex;
+    PVIRTIORING pRing         = &pQueue->Ring;
+
+    if (FreeIndex >= pRing->cDesc - 1)
+    {
+        LogRel((VIRTIOLOGNAME ":VirtioRingPush: failed. No free descriptors. cDesc=%u\n", pRing->cDesc));
+        return VERR_BUFFER_OVERFLOW;
+    }
+
+    PVIRTIORINGDESC pRingDesc = &pRing->pRingDesc[FreeIndex];
+
+    AssertCompile(sizeof(physBuf) == sizeof(pRingDesc->AddrBuf));
+
+    pQueue->cBufs++;
+    uint_t AvailIndex = (pRing->pRingAvail->Index + pQueue->cBufs) % pQueue->Ring.cDesc;
+    pRing->pRingAvail->aRings[AvailIndex - 1] = FreeIndex;
+
+    pRingDesc->AddrBuf = physBuf;
+    pRingDesc->cbBuf   = cbBuf;
+    pRingDesc->fFlags  = fFlags;
+
+    pQueue->FreeHeadIndex = pRingDesc->Next;
+
+    ASMCompilerBarrier();
+
+    cmn_err(CE_NOTE, "VirtioRingPush: cbBuf=%u FreeIndex=%u AvailIndex=%u cDesc=%u Queue->cBufs=%u\n",
+            cbBuf, FreeIndex, AvailIndex, pQueue->Ring.cDesc,
+            pQueue->cBufs);
+
+    return VINF_SUCCESS;
+}
+