mirror of
https://github.com/reactos/reactos.git
synced 2024-09-09 12:20:21 +00:00
268 lines
7.9 KiB
C
268 lines
7.9 KiB
C
/*
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* COPYRIGHT: GPL - See COPYING in the top level directory
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* PROJECT: ReactOS Virtual DOS Machine
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* FILE: bios.c
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* PURPOSE: VDM BIOS
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* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
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*/
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#include "ntvdm.h"
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BYTE CursorRow, CursorCol;
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WORD ConsoleWidth, ConsoleHeight;
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BOOLEAN BiosInitialize()
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{
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INT i;
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WORD Offset = 0;
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HANDLE ConsoleOutput = GetStdHandle(STD_OUTPUT_HANDLE);
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CONSOLE_SCREEN_BUFFER_INFO ConsoleInfo;
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LPWORD IntVecTable = (LPWORD)((ULONG_PTR)BaseAddress);
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LPBYTE BiosCode = (LPBYTE)((ULONG_PTR)BaseAddress + TO_LINEAR(BIOS_SEGMENT, 0));
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/* Generate ISR stubs and fill the IVT */
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for (i = 0; i < 256; i++)
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{
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IntVecTable[i * 2] = Offset;
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IntVecTable[i * 2 + 1] = BIOS_SEGMENT;
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if (i != SPECIAL_INT_NUM)
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{
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BiosCode[Offset++] = 0xFA; // cli
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BiosCode[Offset++] = 0x6A; // push i
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BiosCode[Offset++] = (BYTE)i;
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BiosCode[Offset++] = 0xCD; // int SPECIAL_INT_NUM
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BiosCode[Offset++] = SPECIAL_INT_NUM;
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BiosCode[Offset++] = 0x83; // add sp, 2
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BiosCode[Offset++] = 0xC4;
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BiosCode[Offset++] = 0x02;
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}
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BiosCode[Offset++] = 0xCF; // iret
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}
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/* Get the console buffer info */
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if (!GetConsoleScreenBufferInfo(ConsoleOutput, &ConsoleInfo))
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{
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return FALSE;
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}
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/* Set the initial cursor position and console size */
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CursorCol = ConsoleInfo.dwCursorPosition.X;
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CursorRow = ConsoleInfo.dwCursorPosition.Y;
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ConsoleWidth = ConsoleInfo.dwSize.X;
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ConsoleHeight = ConsoleInfo.dwSize.Y;
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/* Initialize the PIC */
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PicWriteCommand(PIC_MASTER_CMD, PIC_ICW1 | PIC_ICW1_ICW4);
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PicWriteCommand(PIC_SLAVE_CMD, PIC_ICW1 | PIC_ICW1_ICW4);
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/* Set the interrupt offsets */
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PicWriteData(PIC_MASTER_DATA, BIOS_PIC_MASTER_INT);
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PicWriteData(PIC_SLAVE_DATA, BIOS_PIC_SLAVE_INT);
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/* Tell the master PIC there is a slave at IRQ 2 */
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PicWriteData(PIC_MASTER_DATA, 1 << 2);
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PicWriteData(PIC_SLAVE_DATA, 2);
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/* Make sure the PIC is in 8086 mode */
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PicWriteData(PIC_MASTER_DATA, PIC_ICW4_8086);
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PicWriteData(PIC_SLAVE_DATA, PIC_ICW4_8086);
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/* Clear the masks for both PICs */
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PicWriteData(PIC_MASTER_DATA, 0x00);
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PicWriteData(PIC_SLAVE_DATA, 0x00);
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PitWriteCommand(0x34);
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PitWriteData(0, 0x00);
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PitWriteData(0, 0x00);
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return TRUE;
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}
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static COORD BiosVideoAddressToCoord(ULONG Address)
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{
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COORD Result = {0, 0};
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CONSOLE_SCREEN_BUFFER_INFO ConsoleInfo;
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HANDLE ConsoleOutput = GetStdHandle(STD_OUTPUT_HANDLE);
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if (!GetConsoleScreenBufferInfo(ConsoleOutput, &ConsoleInfo))
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{
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ASSERT(FALSE);
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return Result;
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}
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Result.X = ((Address - CONSOLE_VIDEO_MEM_START) >> 1) % ConsoleInfo.dwSize.X;
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Result.Y = ((Address - CONSOLE_VIDEO_MEM_START) >> 1) / ConsoleInfo.dwSize.X;
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return Result;
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}
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VOID BiosUpdateConsole(ULONG StartAddress, ULONG EndAddress)
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{
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ULONG i;
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COORD Coordinates;
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DWORD CharsWritten;
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HANDLE ConsoleOutput = GetStdHandle(STD_OUTPUT_HANDLE);
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/* Loop through all the addresses */
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for (i = StartAddress; i < EndAddress; i++)
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{
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/* Get the coordinates */
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Coordinates = BiosVideoAddressToCoord(i);
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/* Check if this is a character byte or an attribute byte */
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if ((i - CONSOLE_VIDEO_MEM_START) % 2 == 0)
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{
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/* This is a regular character */
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FillConsoleOutputCharacterA(ConsoleOutput,
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*(PCHAR)((ULONG_PTR)BaseAddress + i),
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sizeof(CHAR),
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Coordinates,
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&CharsWritten);
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}
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else
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{
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/* This is an attribute */
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FillConsoleOutputAttribute(ConsoleOutput,
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*(PCHAR)((ULONG_PTR)BaseAddress + i),
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sizeof(CHAR),
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Coordinates,
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&CharsWritten);
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}
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}
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}
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VOID BiosUpdateVideoMemory(ULONG StartAddress, ULONG EndAddress)
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{
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ULONG i;
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COORD Coordinates;
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WORD Attribute;
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DWORD CharsWritten;
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HANDLE ConsoleOutput = GetStdHandle(STD_OUTPUT_HANDLE);
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/* Loop through all the addresses */
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for (i = StartAddress; i < EndAddress; i++)
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{
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/* Get the coordinates */
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Coordinates = BiosVideoAddressToCoord(i);
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/* Check if this is a character byte or an attribute byte */
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if ((i - CONSOLE_VIDEO_MEM_START) % 2 == 0)
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{
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/* This is a regular character */
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ReadConsoleOutputCharacterA(ConsoleOutput,
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(LPSTR)((ULONG_PTR)BaseAddress + i),
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sizeof(CHAR),
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Coordinates,
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&CharsWritten);
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}
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else
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{
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/* This is an attribute */
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ReadConsoleOutputAttribute(ConsoleOutput,
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&Attribute,
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sizeof(CHAR),
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Coordinates,
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&CharsWritten);
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*(PCHAR)((ULONG_PTR)BaseAddress + i) = LOBYTE(Attribute);
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}
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}
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}
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VOID BiosVideoService()
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{
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HANDLE ConsoleOutput = GetStdHandle(STD_OUTPUT_HANDLE);
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INT CursorHeight;
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BOOLEAN Invisible = FALSE;
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COORD Position;
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CONSOLE_CURSOR_INFO CursorInfo;
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CHAR_INFO Character;
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SMALL_RECT Rect;
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DWORD Eax = EmulatorGetRegister(EMULATOR_REG_AX);
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DWORD Ecx = EmulatorGetRegister(EMULATOR_REG_CX);
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DWORD Edx = EmulatorGetRegister(EMULATOR_REG_DX);
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DWORD Ebx = EmulatorGetRegister(EMULATOR_REG_BX);
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switch (HIBYTE(Eax))
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{
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/* Set Text-Mode Cursor Shape */
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case 0x01:
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{
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/* Retrieve and validate the input */
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Invisible = ((HIBYTE(Ecx) >> 5) & 0x03) ? TRUE : FALSE;
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CursorHeight = (HIBYTE(Ecx) & 0x1F) - (LOBYTE(Ecx) & 0x1F);
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if (CursorHeight < 1) CursorHeight = 1;
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if (CursorHeight > 100) CursorHeight = 100;
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/* Set the cursor */
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CursorInfo.dwSize = (CursorHeight * 100) / CONSOLE_FONT_HEIGHT;
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CursorInfo.bVisible = !Invisible;
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SetConsoleCursorInfo(ConsoleOutput, &CursorInfo);
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break;
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}
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/* Set Cursor Position */
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case 0x02:
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{
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Position.X = LOBYTE(Edx);
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Position.Y = HIBYTE(Edx);
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SetConsoleCursorPosition(ConsoleOutput, Position);
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break;
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}
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/* Scroll Up/Down Window */
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case 0x06:
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case 0x07:
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{
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Rect.Top = HIBYTE(Ecx);
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Rect.Left = LOBYTE(Ecx);
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Rect.Bottom = HIBYTE(Edx);
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Rect.Right = LOBYTE(Edx);
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Character.Char.UnicodeChar = L' ';
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Character.Attributes = HIBYTE(Ebx);
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Position.X = Rect.Left;
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if (HIBYTE(Eax) == 0x06) Position.Y = Rect.Top - LOBYTE(Eax);
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else Position.Y = Rect.Top + LOBYTE(Eax);
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ScrollConsoleScreenBuffer(ConsoleOutput,
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&Rect,
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&Rect,
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Position,
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&Character);
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break;
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}
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/* Read Character And Attribute At Cursor Position */
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case 0x08:
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{
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break;
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}
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/* Write Character And Attribute At Cursor Position */
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case 0x09:
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{
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break;
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}
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/* Write Character Only At Cursor Position */
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case 0x0A:
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{
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break;
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}
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}
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}
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VOID BiosHandleIrq(BYTE IrqNumber)
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{
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PicWriteCommand(PIC_MASTER_CMD, PIC_OCW2_EOI);
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}
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/* EOF */
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