1 files changed, 133 insertions, 0 deletions
diff --git a/src/VBox/Devices/Storage/VBoxSCSI.h b/src/VBox/Devices/Storage/VBoxSCSI.h
new file mode 100644
index 00000000..3dcc5416
--- /dev/null
+++ b/src/VBox/Devices/Storage/VBoxSCSI.h
@@ -0,0 +1,133 @@
+/* $Id: VBoxSCSI.h $ */
+/** @file
+ * VBox storage devices - Simple SCSI interface for BIOS access.
+ */
+
+/*
+ * Copyright (C) 2006-2022 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>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+/** @page pg_drv_scsi   Simple SCSI interface for BIOS access.
+ *
+ * This is a simple interface to access SCSI devices from the BIOS which is
+ * shared between the BusLogic and the LsiLogic SCSI host adapters to simplify
+ * the BIOS part.
+ *
+ * The first interface (if available) will be starting at port 0x430 and
+ * each will occupy 4 ports. The ports are used as described below:
+ *
+ * +--------+--------+----------+
+ * | Offset | Access | Purpose  |
+ * +--------+--------+----------+
+ * |   0    |  Write | Command  |
+ * +--------+--------+----------+
+ * |   0    |  Read  | Status   |
+ * +--------+--------+----------+
+ * |   1    |  Write | Data in  |
+ * +--------+--------+----------+
+ * |   1    |  Read  | Data out |
+ * +--------+--------+----------+
+ * |   2    |  R/W   | Detect   |
+ * +--------+--------+----------+
+ * |   3    |  Read  | SCSI rc  |
+ * +--------+--------+----------+
+ * |   3    |  Write | Reset    |
+ * +--------+--------+----------+
+ *
+ * The register at port 0 receives the SCSI CDB issued from the driver when
+ * writing to it but before writing the actual CDB the first write gives the
+ * size of the CDB in bytes.
+ *
+ * Reading the port at offset 0 gives status information about the adapter. If
+ * the busy bit is set the adapter is processing a previous issued request if it is
+ * cleared the command finished and the adapter can process another request.
+ * The driver has to poll this bit because the adapter will not assert an IRQ
+ * for simplicity reasons.
+ *
+ * The register at offset 2 is to detect if a host adapter is available. If the
+ * driver writes a value to this port and gets the same value after reading it
+ * again the adapter is available.
+ *
+ * Any write to the register at offset 3 causes the interface to be reset. A
+ * read returns the SCSI status code of the last operation.
+ *
+ * This part has no R0 or RC components.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_Storage_VBoxSCSI_h
+#define VBOX_INCLUDED_SRC_Storage_VBoxSCSI_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+/*******************************************************************************
+*   Header Files                                                               *
+*******************************************************************************/
+#include <VBox/vmm/pdmdev.h>
+#include <VBox/version.h>
+
+#ifdef IN_RING3
+RT_C_DECLS_BEGIN
+
+/**
+ * Helper shared by the LsiLogic and BusLogic device emulations to load legacy saved states
+ * before the removal of the VBoxSCSI interface.
+ *
+ * @returns VBox status code.
+ * @param   pHlp                Pointer to the Ring-3 device helper table.
+ * @param   pSSM                The SSM handle to operate on.
+ */
+DECLINLINE(int) vboxscsiR3LoadExecLegacy(PCPDMDEVHLPR3 pHlp, PSSMHANDLE pSSM)
+{
+    pHlp->pfnSSMSkip(pSSM, 4);
+
+    /*
+     * The CDB buffer was increased with r104155 in trunk (backported to 5.0
+     * in r104311) without bumping the SSM state versions which leaves us
+     * with broken saved state restoring for older VirtualBox releases
+     * (up to 5.0.10).
+     */
+    if (   (   pHlp->pfnSSMHandleRevision(pSSM) < 104311
+            && pHlp->pfnSSMHandleVersion(pSSM)  < VBOX_FULL_VERSION_MAKE(5, 0, 12))
+        || (   pHlp->pfnSSMHandleRevision(pSSM) < 104155
+            && pHlp->pfnSSMHandleVersion(pSSM)  >= VBOX_FULL_VERSION_MAKE(5, 0, 51)))
+        pHlp->pfnSSMSkip(pSSM, 12);
+    else
+        pHlp->pfnSSMSkip(pSSM, 20);
+
+    pHlp->pfnSSMSkip(pSSM, 1); /*iCDB*/
+    uint32_t cbBufLeft, iBuf;
+    pHlp->pfnSSMGetU32(pSSM, &cbBufLeft);
+    pHlp->pfnSSMGetU32(pSSM, &iBuf);
+    pHlp->pfnSSMSkip(pSSM, 2); /*fBusy, enmState*/
+
+    if (cbBufLeft + iBuf)
+        pHlp->pfnSSMSkip(pSSM, cbBufLeft + iBuf);
+
+    return VINF_SUCCESS;
+}
+
+
+RT_C_DECLS_END
+#endif /* IN_RING3 */
+
+#endif /* !VBOX_INCLUDED_SRC_Storage_VBoxSCSI_h */
+