Set selector 0000H base to 0xf0000 until the first 64K are

dlls/kernel/kernel_main.c

@@ -57,13 +57,13 @@ static BOOL process_attach(void)
                       DOSMEM_MapDosToLinear(addr), 0x10000, hModule, \
                       FALSE, FALSE, FALSE ))
 
-    SET_ENTRY_POINT( 183, 0x00000 );  /* KERNEL.183: __0000H */
     SET_ENTRY_POINT( 174, 0xa0000 );  /* KERNEL.174: __A000H */
     SET_ENTRY_POINT( 181, 0xb0000 );  /* KERNEL.181: __B000H */
     SET_ENTRY_POINT( 182, 0xb8000 );  /* KERNEL.182: __B800H */
     SET_ENTRY_POINT( 195, 0xc0000 );  /* KERNEL.195: __C000H */
     SET_ENTRY_POINT( 179, 0xd0000 );  /* KERNEL.179: __D000H */
     SET_ENTRY_POINT( 190, 0xe0000 );  /* KERNEL.190: __E000H */
+    NE_SetEntryPoint( hModule, 183, DOSMEM_0000H );       /* KERNEL.183: __0000H */
     NE_SetEntryPoint( hModule, 173, DOSMEM_BiosSysSeg );  /* KERNEL.173: __ROMBIOS */
     NE_SetEntryPoint( hModule, 193, DOSMEM_BiosDataSeg ); /* KERNEL.193: __0040H */
     NE_SetEntryPoint( hModule, 194, DOSMEM_BiosSysSeg );  /* KERNEL.194: __F000H */

include/miscemu.h

@@ -122,6 +122,7 @@ typedef struct
 
 #include "poppack.h"
 
+extern WORD DOSMEM_0000H;
 extern WORD DOSMEM_BiosDataSeg;
 extern WORD DOSMEM_BiosSysSeg;
 extern BIOSDATA * DOSMEM_BiosData();

msdos/dosmem.c

@@ -28,8 +28,9 @@
 DEFAULT_DEBUG_CHANNEL(dosmem);
 DECLARE_DEBUG_CHANNEL(selector);
 
-HANDLE16 DOSMEM_BiosDataSeg;  /* BIOS data segment at 0x40:0 */
-HANDLE16 DOSMEM_BiosSysSeg;   /* BIOS ROM segment at 0xf000:0 */
+WORD DOSMEM_0000H;        /* segment at 0:0 */
+WORD DOSMEM_BiosDataSeg;  /* BIOS data segment at 0x40:0 */
+WORD DOSMEM_BiosSysSeg;   /* BIOS ROM segment at 0xf000:0 */
 
 DWORD DOSMEM_CollateTable;
 
@@ -484,6 +485,8 @@ BOOL DOSMEM_Init(BOOL dos_init)
     {
         setup_dos_mem( dos_init );
 
+        DOSMEM_0000H = GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_biosdata - 0x400,
+                                           0x10000, 0, FALSE, FALSE, FALSE );
         DOSMEM_BiosDataSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_biosdata,
                                                 0x100, 0, FALSE, FALSE, FALSE );
         DOSMEM_BiosSysSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem+0xf0000,
@@ -509,6 +512,7 @@ BOOL DOSMEM_Init(BOOL dos_init)
         /* copy the BIOS area down to 0x400 */
         memcpy( DOSMEM_dosmem + 0x400, DOSMEM_biosdata, 0x100 );
         DOSMEM_biosdata = DOSMEM_dosmem + 0x400;
+        SetSelectorBase( DOSMEM_0000H, 0 );
         SetSelectorBase( DOSMEM_BiosDataSeg, 0x400 );
     }
     /* interrupt table is at addr 0, so only do this when setting up DOS mode */