From e33b141b7e35c292d4150b70b8f305366844f2b0 Mon Sep 17 00:00:00 2001
From: Maxim Poliakovski <maximumspatium@googlemail.com>
Date: Mon, 29 Aug 2022 11:18:53 +0200
Subject: [PATCH] machinepdm: support for pluggable PDS devices.

---
 machines/machinefactory.cpp |  1 +
 machines/machinepdm.cpp     | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/machines/machinefactory.cpp b/machines/machinefactory.cpp
index ac2553b..09b4d1d 100644
--- a/machines/machinefactory.cpp
+++ b/machines/machinefactory.cpp
@@ -84,6 +84,7 @@ static const map<string, string> PropHelp = {
     {"pci_C1",          "insert a PCI device into C1 slot"},
     {"serial_backend",  "specifies the backend for the serial port"},
     {"emmo",            "enables/disables factory HW tests during startup"},
+    {"pds",             "specify device for the processsor direct slot"},
 };
 
 bool MachineFactory::add(const string& machine_id, MachineDescription desc)
diff --git a/machines/machinepdm.cpp b/machines/machinepdm.cpp
index 3681e57..bd38b18 100644
--- a/machines/machinepdm.cpp
+++ b/machines/machinepdm.cpp
@@ -36,6 +36,35 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <string>
 #include <vector>
 
+void setup_pds()
+{
+    std::string dev_name = GET_STR_PROP("pds");
+    if (!dev_name.empty()) {
+        if (!DeviceRegistry::device_registered(dev_name)) {
+            LOG_F(WARNING, "specified PDS device %s doesn't exist", dev_name.c_str());
+            goto empty_slot;
+        }
+
+        // attempt to create device object
+        auto dev_obj = DeviceRegistry::get_descriptor(dev_name).m_create_func();
+
+        // safety check
+        if (!dev_obj->supports_type(HWCompType::PDS_DEV)) {
+            LOG_F(WARNING, "Cannot use device %s with the PDS", dev_name.c_str());
+            goto empty_slot;
+        }
+
+        // add device to the machine object
+        gMachineObj->add_device(dev_name, std::move(dev_obj));
+
+        LOG_F(INFO, "PDS slot: %s", dev_name.c_str());
+        return;
+    }
+
+empty_slot:
+    LOG_F(INFO, "PDS slot: empty");
+}
+
 int initialize_pdm(std::string& id)
 {
     uint16_t machine_id;
@@ -81,6 +110,9 @@ int initialize_pdm(std::string& id)
     // add internal SCSI bus
     gMachineObj->add_device("SCSI0", std::unique_ptr<ScsiBus>(new ScsiBus()));
 
+    // set up the processor direct slot
+    setup_pds();
+
     // Init virtual CPU and request MPC601
     ppc_cpu_init(hmc_obj, PPC_VER::MPC601, 7812500ULL);
 
@@ -102,6 +134,8 @@ static const PropMap pm6100_settings = {
         new IntProperty(0, vector<uint32_t>({0, 8, 16, 32, 64, 128}))},
     {"mon_id",
         new StrProperty("HiRes12-14in", PDMBuiltinMonitorIDs)},
+    {"pds",
+        new StrProperty("")},
     {"emmo",
         new BinProperty(0)},
 };