[FREELDR] Add Serial ports detection in DetectIsaBios() (#1829)

CORE-16216

boot/freeldr/freeldr/arch/i386/machpc.c

@@ -636,23 +636,11 @@ DetectSerialPointerPeripheral(PCONFIGURATION_COMPONENT_DATA ControllerKey,
     }
 }
 
-static
-VOID
-DetectSerialPorts(PCONFIGURATION_COMPONENT_DATA BusKey)
+ULONG
+PcGetSerialPort(ULONG Index, PULONG Irq)
 {
-    PCM_PARTIAL_RESOURCE_LIST PartialResourceList;
-    PCM_PARTIAL_RESOURCE_DESCRIPTOR PartialDescriptor;
-    PCM_SERIAL_DEVICE_DATA SerialDeviceData;
-    ULONG Irq[MAX_COM_PORTS] = {4, 3, 4, 3};
-    ULONG Base;
-    CHAR Buffer[80];
+    static const ULONG PcIrq[MAX_COM_PORTS] = {4, 3, 4, 3};
     PUSHORT BasePtr;
-    ULONG ControllerNumber = 0;
-    PCONFIGURATION_COMPONENT_DATA ControllerKey;
-    ULONG i;
-    ULONG Size;
-
-    TRACE("DetectSerialPorts()\n");
 
     /*
      * The BIOS data area 0x400 holds the address of the first valid COM port.
@@ -660,10 +648,30 @@ DetectSerialPorts(PCONFIGURATION_COMPONENT_DATA BusKey)
      * Infos at: http://www.bioscentral.com/misc/bda.htm
      */
     BasePtr = (PUSHORT)0x400;
+    *Irq = PcIrq[Index];
 
-    for (i = 0; i < MAX_COM_PORTS; i++, BasePtr++)
+    return (ULONG) *(BasePtr + Index);
+}
+
+VOID
+DetectSerialPorts(PCONFIGURATION_COMPONENT_DATA BusKey, GET_SERIAL_PORT MachGetSerialPort, ULONG Count)
+{
+    PCM_PARTIAL_RESOURCE_LIST PartialResourceList;
+    PCM_PARTIAL_RESOURCE_DESCRIPTOR PartialDescriptor;
+    PCM_SERIAL_DEVICE_DATA SerialDeviceData;
+    ULONG Irq;
+    ULONG Base;
+    CHAR Buffer[80];
+    ULONG ControllerNumber = 0;
+    PCONFIGURATION_COMPONENT_DATA ControllerKey;
+    ULONG i;
+    ULONG Size;
+
+    TRACE("DetectSerialPorts()\n");
+
+    for (i = 0; i < Count; i++)
     {
-        Base = (ULONG) * BasePtr;
+        Base = MachGetSerialPort(i, &Irq);
         if ((Base == 0) || !CpDoesPortExist(UlongToPtr(Base)))
             continue;
 
@@ -703,8 +711,8 @@ DetectSerialPorts(PCONFIGURATION_COMPONENT_DATA BusKey)
         PartialDescriptor->Type = CmResourceTypeInterrupt;
         PartialDescriptor->ShareDisposition = CmResourceShareUndetermined;
         PartialDescriptor->Flags = CM_RESOURCE_INTERRUPT_LATCHED;
-        PartialDescriptor->u.Interrupt.Level = Irq[i];
-        PartialDescriptor->u.Interrupt.Vector = Irq[i];
+        PartialDescriptor->u.Interrupt.Level = Irq;
+        PartialDescriptor->u.Interrupt.Vector = Irq;
         PartialDescriptor->u.Interrupt.Affinity = 0xFFFFFFFF;
 
         /* Set serial data (device specific) */
@@ -1319,7 +1327,7 @@ DetectIsaBios(PCONFIGURATION_COMPONENT_DATA SystemKey, ULONG *BusNumber)
 
     /* Detect ISA/BIOS devices */
     DetectBiosDisks(SystemKey, BusKey);
-    DetectSerialPorts(BusKey);
+    DetectSerialPorts(BusKey, PcGetSerialPort, MAX_COM_PORTS);
     DetectParallelPorts(BusKey);
     DetectKeyboardController(BusKey);
     DetectPS2Mouse(BusKey);

boot/freeldr/freeldr/arch/i386/machxbox.c

@@ -35,6 +35,53 @@ XboxFindPciBios(PPCI_REGISTRY_INFO BusData)
     return TRUE;
 }
 
+extern
+VOID
+DetectSerialPointerPeripheral(PCONFIGURATION_COMPONENT_DATA ControllerKey, PUCHAR Base);
+
+static
+ULONG
+XboxGetSerialPort(ULONG Index, PULONG Irq)
+{
+    /*
+     * Xbox may have maximum two Serial COM ports
+     * if the Super I/O chip is connected via LPC
+     */
+    static const UCHAR Device[MAX_XBOX_COM_PORTS] = {LPC_DEVICE_SERIAL_PORT_1, LPC_DEVICE_SERIAL_PORT_2};
+    ULONG ComBase = 0;
+
+    // Enter Configuration
+    WRITE_PORT_UCHAR(LPC_IO_BASE, LPC_ENTER_CONFIG_KEY);
+
+    // Select serial device
+    WRITE_PORT_UCHAR(LPC_IO_BASE, LPC_CONFIG_DEVICE_NUMBER);
+    WRITE_PORT_UCHAR(LPC_IO_BASE + 1, Device[Index]);
+
+    // Check if selected device is active
+    WRITE_PORT_UCHAR(LPC_IO_BASE, LPC_CONFIG_DEVICE_ACTIVATE);
+    if (READ_PORT_UCHAR(LPC_IO_BASE + 1) == 1)
+    {
+        // Read LSB
+        WRITE_PORT_UCHAR(LPC_IO_BASE, LPC_CONFIG_DEVICE_BASE_ADDRESS_LOW);
+        ComBase = READ_PORT_UCHAR(LPC_IO_BASE + 1);
+        // Read MSB
+        WRITE_PORT_UCHAR(LPC_IO_BASE, LPC_CONFIG_DEVICE_BASE_ADDRESS_HIGH);
+        ComBase |= (READ_PORT_UCHAR(LPC_IO_BASE + 1) << 8);
+        // Read IRQ
+        WRITE_PORT_UCHAR(LPC_IO_BASE, LPC_CONFIG_DEVICE_INTERRUPT);
+        *Irq = READ_PORT_UCHAR(LPC_IO_BASE + 1);
+    }
+
+    // Exit Configuration
+    WRITE_PORT_UCHAR(LPC_IO_BASE, LPC_EXIT_CONFIG_KEY);
+
+    return ComBase;
+}
+
+extern
+VOID
+DetectSerialPorts(PCONFIGURATION_COMPONENT_DATA BusKey, GET_SERIAL_PORT MachGetSerialPort, ULONG Count);
+
 VOID
 XboxGetExtendedBIOSData(PULONG ExtendedBIOSDataArea, PULONG ExtendedBIOSDataSize)
 {
@@ -155,6 +202,7 @@ DetectIsaBios(PCONFIGURATION_COMPONENT_DATA SystemKey, ULONG *BusNumber)
 
     /* Detect ISA/BIOS devices */
     DetectBiosDisks(SystemKey, BusKey);
+    DetectSerialPorts(BusKey, XboxGetSerialPort, MAX_XBOX_COM_PORTS);
 
     /* FIXME: Detect more ISA devices */
 }

boot/freeldr/freeldr/include/arch/i386/machxbox.h

@@ -22,6 +22,21 @@
 #include "mm.h"
 #endif
 
+#define MAX_XBOX_COM_PORTS    2
+
+#define LPC_IO_BASE             0x2E
+#define LPC_ENTER_CONFIG_KEY    0x55
+#define LPC_EXIT_CONFIG_KEY     0xAA
+
+#define LPC_DEVICE_SERIAL_PORT_1    0x4
+#define LPC_DEVICE_SERIAL_PORT_2    0x5
+
+#define LPC_CONFIG_DEVICE_NUMBER                0x07
+#define LPC_CONFIG_DEVICE_ACTIVATE              0x30
+#define LPC_CONFIG_DEVICE_BASE_ADDRESS_HIGH     0x60
+#define LPC_CONFIG_DEVICE_BASE_ADDRESS_LOW      0x61
+#define LPC_CONFIG_DEVICE_INTERRUPT             0x70
+
 extern UCHAR XboxFont8x16[256 * 16];
 
 VOID XboxMachInit(const char *CmdLine);

boot/freeldr/freeldr/include/arch/pc/hardware.h

@@ -44,6 +44,10 @@ BOOLEAN
 
 extern FIND_PCI_BIOS FindPciBios;
 
+typedef
+ULONG
+(*GET_SERIAL_PORT)(ULONG Index, PULONG Irq);
+
 VOID
 DetectBiosDisks(PCONFIGURATION_COMPONENT_DATA SystemKey,
                 PCONFIGURATION_COMPONENT_DATA BusKey);