more latch copy fun, write asm kb interrupt handler bc why not
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51625bb432
commit
4f85bd4b1b
43
main.c
43
main.c
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@ -1,22 +1,29 @@
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#include <stdio.h>
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#include <i86.h>
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#include <conio.h>
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extern void __cdecl enableUnchainedVGAMode();
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extern void __cdecl enableTextMode();
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extern void __cdecl fillScreen(int);
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extern void __cdecl latchCopyCube();
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extern void __cdecl latchCopyCube(char offset, int writtenValue, int writeMode);
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extern int __cdecl paramTest(int wow);
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extern void __cdecl far interrupt keyboardHandler();
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extern char keyboardPressed;
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char far *VGA = (char*)0xA0000;
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#define PLANE_WIDTH (320 / 4)
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void far (interrupt *int9Save)();
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void populateExampleCube(void) {
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int y, x;
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outp(0x3c4, 0x02);
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for (y = 0; y < 15; ++y) {
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for (x = 0; x < 15; ++x) {
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for (y = 0; y < 16; ++y) {
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for (x = 0; x < 16; ++x) {
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outp(0x3c5, 1 << (x % 4));
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VGA[y * PLANE_WIDTH + x / 4] = y * 16 + x;
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}
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@ -34,14 +41,40 @@ int main(void) {
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int i,j;
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int9Save = _dos_getvect(9);
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_dos_setvect(9, keyboardHandler);
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printf("%p\n", keyboardHandler);
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while (keyboardPressed == 0) {
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printf("%d\n", keyboardPressed);
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}
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printf("wow\n");
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delay(200);
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_dos_setvect(9, int9Save);
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return 0;
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enableUnchainedVGAMode();
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fillScreen(0);
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populateExampleCube();
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latchCopyCube();
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latchCopyCube(8, 0, 0x00);
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latchCopyCube(12, 127, 0x00);
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latchCopyCube(16, 0, 0x08);
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latchCopyCube(20, 127, 0x08);
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latchCopyCube(24, 0, 0x10);
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latchCopyCube(28, 127, 0x10);
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latchCopyCube(32, 0, 0x18);
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latchCopyCube(36, 127, 0x18);
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while (keyboardPressed == 0) {
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delay(1);
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}
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delay(2000);
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/*
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79
vga.asm
79
vga.asm
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@ -2,6 +2,9 @@ PUBLIC _enableUnchainedVGAMode
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PUBLIC _enableTextMode
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PUBLIC _fillScreen
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PUBLIC _latchCopyCube
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PUBLIC _paramTest
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PUBLIC _keyboardPressed
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PUBLIC _keyboardHandler
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DISPLAY_MODE_VGA equ 13h
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DISPLAY_MODE_TEXT equ 03h
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@ -23,8 +26,42 @@ VGA_CRT_CONTROLLER_MODE_CONTROL equ 0x17
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.386
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.model flat,c
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.DATA
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_keyboardPressed dd 0
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.CODE
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_keyboardHandler:
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cli
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push eax
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push ebx
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in al, 0x60
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mov bl, al
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; acknowledge keyboard
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in al, 0x61
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mov ah, al
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or al, 0x80
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out 0x61, al
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xchg ah, al
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out 0x61, al
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and bl,0x80
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jne _keyboardHandler_notKeydown
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mov [_keyboardPressed], 1
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_keyboardHandler_notKeydown:
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; acknowledge interrupt
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mov al, 0x20
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out 0x20, al
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pop ebx
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pop eax
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sti
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iretd
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_enableUnchainedVGAMode:
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mov ax,0x0013;
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int 0x10
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@ -76,24 +113,49 @@ _fillScreen_loop:
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ret
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_paramTest:
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push ebp
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mov ebp,esp
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mov eax,0
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mov al, BYTE PTR [ebp+8]
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mov esp,ebp
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pop ebp
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ret
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_latchCopyCube:
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push ebp
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mov ebp,esp
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; we need a y variable
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sub esp,4 ; y
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; enable latch reads
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push edx
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push ebx
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; accept a mode
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; accept a mix value
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; accept an x offset
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; [ebp+8] is x offset
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; [ebp+12] is written value
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; [ebp+16] is data rotate register
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; enable latch reads on all planes
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mov dx, VGA_SEQUENCE_CONTROLLER_INDEX
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mov al, VGA_SEQUENCE_CONTROLLER_MAP_MASK_MODE
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mov ah, 0xf
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out dx, ax
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; enable OR writes
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mov dx, VGA_GRAPHICS_MODE_INDEX
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mov al, 0x08
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mov ah, 0x00
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mov al, 0x03
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mov ah, [ebp+16]
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out dx, ax
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mov DWORD PTR [ebp-4],16
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mov dh, [ebp+12]
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mov DWORD PTR [ebp-4],16 ; y
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; read across the cube, should take 4 * 16 reads
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mov cx,[ebp-4]
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_latchCopyCube_yLoop:
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@ -106,14 +168,17 @@ _latchCopyCube_yLoop:
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mul bl ; number of lines
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add eax,0xa0000 ; vga base address
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; keep our index handy
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mov ebx, [ebp+8]
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; start x loop
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mov cx,4
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_latchCopyCube_xLoop:
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; fill latches via memory read
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mov bl, BYTE PTR [eax]
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mov dl, BYTE PTR [eax]
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; write blank
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mov [eax+12],0
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mov BYTE PTR [eax+ebx], dh
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; increment vga pointer
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inc eax
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@ -128,6 +193,8 @@ _latchCopyCube_xLoop:
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loop _latchCopyCube_yLoop
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; put things back
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pop ebx
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pop edx
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mov esp,ebp
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pop ebp
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ret
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