[KDCOM][NTOS:INBV][FREELDR] Decrease default baud rate for PC-98 target (#2601)

According to PC-9801 Bible p. 50, divisor for PIT will become unsupported in some cases after having removed the fractional part. Replace 19200 value with 9600 which is supported by both 10 MHz and 8 MHz machines.

boot/bootdata/floppy_pc98.ini

@@ -39,7 +39,7 @@ Options=/MININT
 [LiveCD_Debug]
 BootType=Windows2003
 SystemPath=multi(0)disk(0)cdrom(0)\reactos
-Options=/DEBUG /DEBUGPORT=COM1 /BAUDRATE=115200 /SOS /MININT
+Options=/DEBUG /DEBUGPORT=COM1 /BAUDRATE=9600 /SOS /MININT
 
 [LiveCD_Screen]
 BootType=Windows2003

boot/freeldr/freeldr/lib/comm/rs232.c

@@ -30,7 +30,11 @@
 
 /* STATIC VARIABLES ***********************************************************/
 
+#if defined(SARCH_PC98)
+#define DEFAULT_BAUD_RATE   9600
+#else
 #define DEFAULT_BAUD_RATE   19200
+#endif
 
 #if defined(_M_IX86) || defined(_M_AMD64)
 #if defined(SARCH_PC98)

boot/freeldr/freeldr/lib/debug.c

@@ -43,8 +43,13 @@ static UCHAR DbgChannels[DBG_CHANNELS_COUNT];
 ULONG DebugPort = RS232;
 
 /* Serial debug connection */
-ULONG ComPort  = 0; // The COM port initializer chooses the first available port starting from COM4 down to COM1.
+#if defined(SARCH_PC98)
+ULONG BaudRate = 9600;
+#else
 ULONG BaudRate = 115200;
+#endif
+
+ULONG ComPort  = 0; // The COM port initializer chooses the first available port starting from COM4 down to COM1.
 ULONG PortIrq  = 0; // Not used at the moment.
 
 BOOLEAN DebugStartOfLine = TRUE;

boot/freeldr/freeldr/ntldr/headless.c

@@ -67,10 +67,10 @@ WinLdrPortInitialize(IN ULONG BaudRate,
                      IN BOOLEAN TerminalConnected,
                      OUT PULONG PortId)
 {
-    /* Set default baud rate */
-    if (BaudRate == 0) BaudRate = 19200;
-
 #if defined(SARCH_PC98)
+    /* Set default baud rate */
+    if (BaudRate == 0) BaudRate = 9600;
+
     /* Check if port or address given */
     if (PortNumber)
     {
@@ -106,6 +106,9 @@ WinLdrPortInitialize(IN ULONG BaudRate,
         }
     }
 #else
+    /* Set default baud rate */
+    if (BaudRate == 0) BaudRate = 19200;
+
     /* Check if port or address given */
     if (PortNumber)
     {

drivers/base/kdcom/kdcom.c

@@ -15,12 +15,19 @@
 #include <ndk/halfuncs.h>
 
 /* Serial debug connection */
+#if defined(SARCH_PC98)
 #define DEFAULT_DEBUG_PORT      2 /* COM2 */
-#define DEFAULT_DEBUG_COM1_IRQ  4 /* COM1 IRQ */
-#define DEFAULT_DEBUG_COM2_IRQ  3 /* COM2 IRQ */
-#define DEFAULT_DEBUG_BAUD_RATE 115200 /* 115200 Baud */
-
-#define DEFAULT_BAUD_RATE   19200
+#define DEFAULT_DEBUG_COM1_IRQ  4
+#define DEFAULT_DEBUG_COM2_IRQ  5
+#define DEFAULT_DEBUG_BAUD_RATE 9600
+#define DEFAULT_BAUD_RATE       9600
+#else
+#define DEFAULT_DEBUG_PORT      2 /* COM2 */
+#define DEFAULT_DEBUG_COM1_IRQ  4
+#define DEFAULT_DEBUG_COM2_IRQ  3
+#define DEFAULT_DEBUG_BAUD_RATE 115200
+#define DEFAULT_BAUD_RATE       19200
+#endif
 
 #if defined(_M_IX86) || defined(_M_AMD64)
 #if defined(SARCH_PC98)

drivers/base/kdgdb/kdcom.c

@@ -13,12 +13,19 @@
 #include <ndk/halfuncs.h>
 
 /* Serial debug connection */
+#if defined(SARCH_PC98)
 #define DEFAULT_DEBUG_PORT      2 /* COM2 */
-#define DEFAULT_DEBUG_COM1_IRQ  4 /* COM1 IRQ */
-#define DEFAULT_DEBUG_COM2_IRQ  3 /* COM2 IRQ */
-#define DEFAULT_DEBUG_BAUD_RATE 115200 /* 115200 Baud */
-
-#define DEFAULT_BAUD_RATE   19200
+#define DEFAULT_DEBUG_COM1_IRQ  4
+#define DEFAULT_DEBUG_COM2_IRQ  5
+#define DEFAULT_DEBUG_BAUD_RATE 9600
+#define DEFAULT_BAUD_RATE       9600
+#else
+#define DEFAULT_DEBUG_PORT      2 /* COM2 */
+#define DEFAULT_DEBUG_COM1_IRQ  4
+#define DEFAULT_DEBUG_COM2_IRQ  3
+#define DEFAULT_DEBUG_BAUD_RATE 115200
+#define DEFAULT_BAUD_RATE       19200
+#endif
 
 #if defined(_M_IX86) || defined(_M_AMD64)
 #if defined(SARCH_PC98)
@@ -299,12 +306,12 @@ NTAPI
 KdpReceiveByte(_Out_ PUCHAR OutByte)
 {
     USHORT CpStatus;
-    
+
     do
     {
         CpStatus = CpGetByte(&KdComPort, OutByte, TRUE, FALSE);
     } while (CpStatus == CP_GET_NODATA);
-    
+
     /* Get the byte */
     if (CpStatus == CP_GET_SUCCESS)
     {

ntoskrnl/inbv/inbvport.c

@@ -79,10 +79,10 @@ InbvPortInitialize(IN  ULONG   BaudRate,
     /* Not yet supported */
     ASSERT(IsMMIODevice == FALSE);
 
-    /* Set default baud rate */
-    if (BaudRate == 0) BaudRate = 19200;
-
 #if defined(SARCH_PC98)
+    /* Set default baud rate */
+    if (BaudRate == 0) BaudRate = 9600;
+
     /* Check if port or address given */
     if (PortNumber)
     {
@@ -118,6 +118,9 @@ InbvPortInitialize(IN  ULONG   BaudRate,
         }
     }
 #else
+    /* Set default baud rate */
+    if (BaudRate == 0) BaudRate = 19200;
+
     /* Check if port or address given */
     if (PortNumber)
     {

ntoskrnl/kd/i386/kdbg.c

@@ -13,8 +13,11 @@
 #define NDEBUG
 #include <debug.h>
 
-
+#if defined(SARCH_PC98)
+#define DEFAULT_BAUD_RATE   9600
+#else
 #define DEFAULT_BAUD_RATE   19200
+#endif
 
 #if defined(_M_IX86) || defined(_M_AMD64)
 #if defined(SARCH_PC98)