[hbelusca] 68002: [NTVDM]: Enable reads for current address and count registers (caught by Mysoft); for 16-bit accesses, be sure to drop the carry when shifting left CurrAddress; fix comments.

Author: hbelusca
Date: Wed Jun  3 21:23:30 2015
New Revision: 68002

URL: http://svn.reactos.org/svn/reactos?rev=68002&view=rev
Log:
[NTVDM]: Enable reads for current address and count registers (caught by Mysoft); for
16-bit accesses, be sure to drop the carry when shifting left CurrAddress; fix comments.

Modified:
    trunk/reactos/subsystems/mvdm/ntvdm/hardware/dma.c

Modified: trunk/reactos/subsystems/mvdm/ntvdm/hardware/dma.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/hard…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/hardware/dma.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/hardware/dma.c	[iso-8859-1] Wed Jun  3 21:23:30
2015
@@ -55,7 +55,7 @@
 
     switch (Port)
     {
-        /* Start Address Registers */
+        /* Current Address Registers */
         {
         case 0x00:
             READ_ADDR(0, 0, ReadValue);
@@ -83,7 +83,7 @@
             return ReadValue;
         }
 
-        /* Count Address Registers */
+        /* Current Count Registers */
         {
         case 0x01:
             READ_CNT(0, 0, ReadValue);
@@ -191,7 +191,7 @@
             break;
         }
 
-        /* Count Address Registers */
+        /* Base Count Registers */
         {
         case 0x01:
             WRITE_CNT(0, 0, Data);
@@ -457,8 +457,8 @@
     length = ret * Size;
 
     /* 16-bit mode addressing, see: http://wiki.osdev.org/ISA_DMA#16_bit_issues */
-    CurrAddress = (iChannel < 4) ? (DmaPageRegisters[iChannel].Page << 16) |
(pDcp->DmaChannel[Channel].CurrAddress << 0)
-                                 : (DmaPageRegisters[iChannel].Page << 16) |
(pDcp->DmaChannel[Channel].CurrAddress << 1);
+    CurrAddress = (iChannel < 4) ? (DmaPageRegisters[iChannel].Page << 16) |
((pDcp->DmaChannel[Channel].CurrAddress << 0) & 0xFFFF)
+                                 : (DmaPageRegisters[iChannel].Page << 16) |
((pDcp->DmaChannel[Channel].CurrAddress << 1) & 0xFFFF);
 
     switch (TrMode)
     {
@@ -549,14 +549,14 @@
     /* Register the I/O Ports */
 
     /* Channels 0(Reserved)..3 */
-    RegisterIoPort(0x00, NULL, DmaWritePort);           /* Start Address Register 0
(Reserved) */
-    RegisterIoPort(0x01, NULL, DmaWritePort);           /* Count Address Register 0
(Reserved) */
-    RegisterIoPort(0x02, NULL, DmaWritePort);           /* Start Address Register 1 */
-    RegisterIoPort(0x03, NULL, DmaWritePort);           /* Count Address Register 1 */
-    RegisterIoPort(0x04, NULL, DmaWritePort);           /* Start Address Register 2 */
-    RegisterIoPort(0x05, NULL, DmaWritePort);           /* Count Address Register 2 */
-    RegisterIoPort(0x06, NULL, DmaWritePort);           /* Start Address Register 3 */
-    RegisterIoPort(0x07, NULL, DmaWritePort);           /* Count Address Register 3 */
+    RegisterIoPort(0x00, DmaReadPort, DmaWritePort);    /* Current(R) / Start(W) Address
Register 0 (Reserved) */
+    RegisterIoPort(0x01, DmaReadPort, DmaWritePort);    /* Current(R) / Base (W) Count
Register 0 (Reserved) */
+    RegisterIoPort(0x02, DmaReadPort, DmaWritePort);    /* Current(R) / Start(W) Address
Register 1 */
+    RegisterIoPort(0x03, DmaReadPort, DmaWritePort);    /* Current(R) / Base (W) Count
Register 1 */
+    RegisterIoPort(0x04, DmaReadPort, DmaWritePort);    /* Current(R) / Start(W) Address
Register 2 */
+    RegisterIoPort(0x05, DmaReadPort, DmaWritePort);    /* Current(R) / Base (W) Count
Register 2 */
+    RegisterIoPort(0x06, DmaReadPort, DmaWritePort);    /* Current(R) / Start(W) Address
Register 3 */
+    RegisterIoPort(0x07, DmaReadPort, DmaWritePort);    /* Current(R) / Base (W) Count
Register 3 */
 
     RegisterIoPort(0x08, DmaReadPort, DmaWritePort);    /* Status (Read) / Command
(Write) Registers */
     RegisterIoPort(0x09, NULL, DmaWritePort);           /* Request Register */
@@ -569,14 +569,14 @@
 
 
     /* Channels 4(Reserved)..7 */
-    RegisterIoPort(0xC0, NULL, DmaWritePort);           /* Start Address Register 4
(Reserved) */
-    RegisterIoPort(0xC2, NULL, DmaWritePort);           /* Count Address Register 4
(Reserved) */
-    RegisterIoPort(0xC4, NULL, DmaWritePort);           /* Start Address Register 5 */
-    RegisterIoPort(0xC6, NULL, DmaWritePort);           /* Count Address Register 5 */
-    RegisterIoPort(0xC8, NULL, DmaWritePort);           /* Start Address Register 6 */
-    RegisterIoPort(0xCA, NULL, DmaWritePort);           /* Count Address Register 6 */
-    RegisterIoPort(0xCC, NULL, DmaWritePort);           /* Start Address Register 7 */
-    RegisterIoPort(0xCE, NULL, DmaWritePort);           /* Count Address Register 7 */
+    RegisterIoPort(0xC0, DmaReadPort, DmaWritePort);    /* Current(R) / Start(W) Address
Register 4 (Reserved) */
+    RegisterIoPort(0xC2, DmaReadPort, DmaWritePort);    /* Current(R) / Base (W) Count
Register 4 (Reserved) */
+    RegisterIoPort(0xC4, DmaReadPort, DmaWritePort);    /* Current(R) / Start(W) Address
Register 5 */
+    RegisterIoPort(0xC6, DmaReadPort, DmaWritePort);    /* Current(R) / Base (W) Count
Register 5 */
+    RegisterIoPort(0xC8, DmaReadPort, DmaWritePort);    /* Current(R) / Start(W) Address
Register 6 */
+    RegisterIoPort(0xCA, DmaReadPort, DmaWritePort);    /* Current(R) / Base (W) Count
Register 6 */
+    RegisterIoPort(0xCC, DmaReadPort, DmaWritePort);    /* Current(R) / Start(W) Address
Register 7 */
+    RegisterIoPort(0xCE, DmaReadPort, DmaWritePort);    /* Current(R) / Base (W) Count
Register 7 */
 
     RegisterIoPort(0xD0, DmaReadPort, DmaWritePort);    /* Status (Read) / Command
(Write) Registers */
     RegisterIoPort(0xD2, NULL, DmaWritePort);           /* Request Register */