Add ModeSense page 37

VAXServer 3100 (CPU KA41-E) console firmware issues ModeSense(6) page 37 when probing for disks. A disk won't be recognized if this returns an error. Fixes PiSCSI#1410 Signed-off-by: Klaus Kämpf <kkaempf@gmail.com>
kkaempf · Jan 13, 2024 · 36824a4 · 36824a4
1 parent ad5eae9
commit 36824a4
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diff --git a/cpp/devices/scsihd.cpp b/cpp/devices/scsihd.cpp
@@ -97,8 +97,32 @@ void SCSIHD::AddFormatPage(map<int, vector<byte>>& pages, bool changeable) const
 	EnrichFormatPage(pages, changeable, 1 << GetSectorSizeShiftCount());
 }
 
+// Page code 37 (25h) - DEC Vendor Mode Page
+// returns 25 (19h) bytes
+// Needed for SCHD for VAXServer 3100 (KA41-E)
+void SCSIHD::AddDECVendorModePage(map<int, vector<byte>>& pages, bool changeable) const
+{
+	vector<byte> buf(25);
+
+	// No changeable area
+	if (changeable) {
+		pages[37] = buf;
+
+		return;
+	}
+
+	SetInt16(buf, 0, 0x17a5);
+	SetInt16(buf, 2, 0x1);
+
+	pages[37] = buf;
+}
+
 void SCSIHD::AddVendorPage(map<int, vector<byte>>& pages, int page, bool changeable) const
 {
+	// Page code 37
+	if (page == 0x25 || page == 0x3f) {
+		AddDECVendorModePage(pages, changeable);
+	}
 	// Page code 48
 	if (page == 0x30 || page == 0x3f) {
 		AddAppleVendorModePage(pages, changeable);

diff --git a/cpp/devices/scsihd.h b/cpp/devices/scsihd.h
@@ -40,6 +40,7 @@ class SCSIHD : public Disk
 	void ModeSelect(scsi_defs::scsi_command, cdb_t, span<const uint8_t>, int) const override;
 
 	void AddFormatPage(map<int, vector<byte>>&, bool) const override;
+	void AddDECVendorModePage(map<int, vector<byte>>&, bool) const;
 	void AddVendorPage(map<int, vector<byte>>&, int, bool) const override;
 
 private: