#define DOS_CONFIG_PATH L"%SystemRoot%\\system32\\CONFIG.NT"
#define DOS_COMMAND_INTERPRETER L"%SystemRoot%\\system32\\COMMAND.COM /k %SystemRoot%\\system32\\AUTOEXEC.NT"
-#define FIRST_MCB_SEGMENT 0x1000
-#define USER_MEMORY_SIZE (0x9FFE - FIRST_MCB_SEGMENT)
+
#define SYSTEM_PSP 0x08
#define SYSTEM_ENV_BLOCK 0x800
#define DOS_CODE_SEGMENT 0x70
#define DOS_ERROR_HANDLE 2
#define DOS_SFT_SIZE 255
-#define UMB_START_SEGMENT 0xC000
-#define UMB_END_SEGMENT 0xDFFF
-#define DOS_ALLOC_HIGH 0x40
-#define DOS_ALLOC_HIGH_LOW 0x80
#define DOS_DIR_LENGTH 64
#define NUM_DRIVES ('Z' - 'A' + 1)
#define DOS_CHAR_ATTRIBUTE 0x07
-/* 16 MB of EMS memory */
-#define EMS_TOTAL_PAGES 1024
-
#pragma pack(push, 1)
typedef struct _DOS_FCB
WORD FirstMcb;
/* This is where the SYSVARS really start */
- DWORD FirstDpb;
- DWORD FirstSft;
- DWORD ActiveClock;
- DWORD ActiveCon;
- BYTE Reserved0[6];
- DWORD CurrentDirs;
- BYTE Reserved1[6];
- BYTE NumBlockDevices;
- BYTE NumLocalDrives; // Set by LASTDRIVE
- DOS_DRIVER NullDevice;
- BYTE NullDriverRoutine[7];
- BYTE Reserved2[8];
- BYTE BootDrive;
- BYTE UseDwordMoves;
- WORD ExtMemSize;
+ DWORD FirstDpb; // 0x00
+ DWORD FirstSft; // 0x04
+ DWORD ActiveClock; // 0x08
+ DWORD ActiveCon; // 0x0c
+ BYTE Reserved0[6]; // 0x10
+ DWORD CurrentDirs; // 0x16
+ BYTE Reserved1[6]; // 0x1a
+ BYTE NumBlockDevices; // 0x20
+ BYTE NumLocalDrives; // 0x21 - Set by LASTDRIVE
+ DOS_DRIVER NullDevice; // 0x22
+ BYTE Reserved2; // 0x34
+ WORD ProgramVersionTable; // 0x35
+ DWORD SetVerTable; // 0x37
+ WORD Reserved3[2]; // 0x3b
+ WORD BuffersNumber; // 0x3f - 'x' parameter in "BUFFERS=x,y" command
+ WORD BuffersLookaheadNumber; // 0x41 - 'y' parameter in "BUFFERS=x,y" command
+ BYTE BootDrive; // 0x43
+ BYTE UseDwordMoves; // 0x44
+ WORD ExtMemSize; // 0x45
+ BYTE Reserved4[0x1C]; // 0x47
+ BYTE ChainUMB; // 0x63 - 0/1: UMB chain (un)linked to MCB chain
+ WORD Reserved5; // 0x64
+ WORD UMBChainStart; // 0x66 - Segment of the first UMB MCB
+ WORD MemAllocScanStart; // 0x68 - Segment where allocation scan starts
} DOS_SYSVARS, *PDOS_SYSVARS;
typedef struct _DOS_CLOCK_TRANSFER_RECORD
typedef struct _DOS_DATA
{
+/*
+ * INT 13h (BIOS Disk Services) handler chain support.
+ *
+ * RomBiosInt13: The original INT 13h vector (normally from ROM BIOS).
+ * PrevInt13 : The previous INT 13h vector in the handler chain (initially
+ * initialized with the RomBiosInt13 value; each time some
+ * program calls INT 2Fh, AH=13h, PrevInt13 is updated).
+ *
+ * DOS hooks INT 13h with its own code, then (in normal circumstances) calls
+ * PrevInt13, so that when a program calls INT 13h, the DOS hook is first called,
+ * followed by the previous INT 13h (be it the original or some other hooked one).
+ * DOS may call PrevInt13 directly in some internal operations too.
+ * RomBiosInt13 is intended to be the original INT 13h vector that existed
+ * before DOS was loaded. A particular version of PC-AT's IBM's ROM BIOS
+ * (on systems with model byte FCh and BIOS date "01/10/84" only, see
+ * http://www.ctyme.com/intr/rb-4453.htm for more details) had a bug on disk
+ * reads so that it was patched by DOS, and therefore PrevInt13 was the fixed
+ * INT 13 interrupt (for the other cases, a direct call to RomBiosInt13 is done).
+ *
+ * NOTE: For compatibility with some programs (including virii), PrevInt13 should
+ * be at 0070:00B4, see for more details:
+ * http://repo.hackerzvoice.net/depot_madchat/vxdevl/vdat/tuvd0001.htm
+ * http://vxheaven.org/lib/vsm01.html
+ */
+ DWORD RomBiosInt13;
+ DWORD PrevInt13; // FIXME: Put it at 0070:00B4
+
DOS_SYSVARS SysVars;
+ BYTE NullDriverRoutine[7];
+ WORD DosVersion; // DOS version to report to programs (can be different from the true one)
DOS_SDA Sda;
CHAR CurrentDirectories[NUM_DRIVES][DOS_DIR_LENGTH];
BYTE Sft[ANYSIZE_ARRAY];
/* VARIABLES ******************************************************************/
extern BOOLEAN DoEcho;
-extern WORD DosErrorLevel;
-extern WORD DosLastError;
+extern PDOS_DATA DosData;
extern PDOS_SYSVARS SysVars;
extern PDOS_SDA Sda;
projects / reactos.git / blobdiff