[hbelusca] 62314: [NTVDM] - Move an "enable interrupts" command to where it belongs (i.e. in the BIOS32 initialization code; we do it at the very end). Otherwise some problems appears when trying t...

Author: hbelusca
Date: Mon Feb 24 00:33:21 2014
New Revision: 62314

URL: http://svn.reactos.org/svn/reactos?rev=62314&view=rev
Log:
[NTVDM]
- Move an "enable interrupts" command to where it belongs (i.e. in the BIOS32 initialization code; we do it at the very end). Otherwise some problems appears when trying to load 16-bit bios images.
- Use the new macro REAL_TO_PHYS to convert "real-mode" pointers (valid inside the VM only) into "physical" ones (valid in ROS/Windows/whatever).
- Add BIG HACKs (thanks Aleksander ;) ) in EmulatorRead/WriteMemory for wrapping up high memory addresses to low ones, so that we can load bios images (when you start running code at F000:FFF0).

To test 16-bit bios images: in ntvdm.c, put a valid bios file name in the BiosInitialize(...) call, and disable all DOS calls that happen before EmulatorSimulate().

Modified:
    branches/ntvdm/subsystems/ntvdm/bios/bios32/bios32.c
    branches/ntvdm/subsystems/ntvdm/emulator.c

Modified: branches/ntvdm/subsystems/ntvdm/bios/bios32/bios32.c
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/subsystems/ntvdm/bios/bios...
==============================================================================
--- branches/ntvdm/subsystems/ntvdm/bios/bios32/bios32.c	[iso-8859-1] (original)
+++ branches/ntvdm/subsystems/ntvdm/bios/bios32/bios32.c	[iso-8859-1] Mon Feb 24 00:33:21 2014
@@ -386,6 +386,10 @@
     /* Initialize the Video BIOS */
     if (!VidBios32Initialize(ConsoleOutput)) return FALSE;

+    /* Enable interrupts */
+    setIF(1);
+
+    /* We are done */
     return TRUE;
 }

Modified: branches/ntvdm/subsystems/ntvdm/emulator.c
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/subsystems/ntvdm/emulator....
==============================================================================
--- branches/ntvdm/subsystems/ntvdm/emulator.c	[iso-8859-1] (original)
+++ branches/ntvdm/subsystems/ntvdm/emulator.c	[iso-8859-1] Mon Feb 24 00:33:21 2014
@@ -65,6 +65,10 @@
 {
     UNREFERENCED_PARAMETER(State);

+    // BIG HACK!!!! To make BIOS images working correctly,
+    // until Aleksander rewrites memory management!!
+    if (Address >= 0xFFFFFFF0) Address -= 0xFFF00000;
+
     /* If the A20 line is disabled, mask bit 20 */
     if (!A20Line) Address &= ~(1 << 20);

@@ -81,19 +85,23 @@
         DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
         DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
                            - VgaAddress + 1;
-        LPBYTE DestBuffer = (LPBYTE)((ULONG_PTR)BaseAddress + VgaAddress);
+        LPBYTE DestBuffer = (LPBYTE)REAL_TO_PHYS(VgaAddress);

/* Read from the VGA memory */
         VgaReadMemory(VgaAddress, DestBuffer, ActualSize);
     }

/* Read the data from the virtual address space and store it in the buffer */
-    RtlCopyMemory(Buffer, (LPVOID)((ULONG_PTR)BaseAddress + Address), Size);
+    RtlCopyMemory(Buffer, REAL_TO_PHYS(Address), Size);
 }

VOID WINAPI EmulatorWriteMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
 {
     UNREFERENCED_PARAMETER(State);
+
+    // BIG HACK!!!! To make BIOS images working correctly,
+    // until Aleksander rewrites memory management!!
+    if (Address >= 0xFFFFFFF0) Address -= 0xFFF00000;

/* If the A20 line is disabled, mask bit 20 */
     if (!A20Line) Address &= ~(1 << 20);
@@ -105,7 +113,7 @@
     if ((Address + Size) >= ROM_AREA_START && (Address < ROM_AREA_END)) return;

/* Read the data from the buffer and store it in the virtual address space */
-    RtlCopyMemory((LPVOID)((ULONG_PTR)BaseAddress + Address), Buffer, Size);
+    RtlCopyMemory(REAL_TO_PHYS(Address), Buffer, Size);

/*
      * Check if we modified the VGA memory.
@@ -116,7 +124,7 @@
         DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
         DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
                            - VgaAddress + 1;
-        LPBYTE SrcBuffer = (LPBYTE)((ULONG_PTR)BaseAddress + VgaAddress);
+        LPBYTE SrcBuffer = (LPBYTE)REAL_TO_PHYS(VgaAddress);

/* Write to the VGA memory */
         VgaWriteMemory(VgaAddress, SrcBuffer, ActualSize);
@@ -355,9 +363,6 @@
                       EmulatorIntAcknowledge,
                       NULL /* TODO: Use a TLB */);

-    /* Enable interrupts */
-    setIF(1);
-
     /* Initialize DMA */

/* Initialize the PIC, the PIT, the CMOS and the PC Speaker */