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Move cursor behaves properly and is fully implemented in this patch with no known bugs

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This commit is contained in:
shockrahwow 2019-05-01 03:17:27 -07:00
parent 86f2db05a0
commit b3ef53ccab
5 changed files with 34 additions and 16 deletions
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11
framebuffer.c
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@ -6,6 +6,7 @@
// | 15-8 | 7-4 | 0-3
// | Asci | FG | BG
#include "framebuffer.h"
#include "io.h"
static char* Frame_Buffer = (char*)FRAME_BUFFER_ADDR;
//static char* Frame_Buffer_End = (char*)(FRAME_BUFFER_ADDR + AREA);
@ -26,10 +27,20 @@ void clear_fb() {
}
}
void fb_move_cursor(unsigned short position) {
out_buffer(FB_CMD, FB_HIGH_CMD);
out_buffer(FB_DATA, ((position >> 8) & 0x00ff) );
out_buffer(FB_CMD, FB_LOW_CMD);
out_buffer(FB_DATA, position & 0x00ff);
}
/* generic test func for this module */
void test_fb() {
clear_fb();
write_cell_fb(FRAME_CELL(0), 'a', Green, White);
write_cell_fb(FRAME_CELL(1), 'b', Green, White);
write_cell_fb(FRAME_CELL(2), 'c', Green, White);
write_cell_fb(FRAME_CELL(3), 'c', Green, White);
write_cell_fb(FRAME_CELL(4), 'c', Green, White);
write_cell_fb(FRAME_CELL(5), 'c', Green, White);
fb_move_cursor(5);
}

10
framebuffer.h
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@ -1,9 +1,19 @@
#include "stl/string.h"
#include "io.h"
#define COLUMNS 80
#define ROWS 25
#define AREA ( COLUMNS * ROWS )
// frame buffer port commansd
#define FB_CMD 0x3d4
#define FB_DATA 0x3d5
#define FB_HIGH_CMD 14
#define FB_LOW_CMD 15
void fb_move_cursor(unsigned short position);
// address of our frame buffer
#define FRAME_BUFFER_ADDR 0x000B8000

7
io.asm Normal file
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@ -0,0 +1,7 @@
global out_buffer
out_buffer:
mov al, [esp+8]
mov dx, [esp+4]
out dx, al
ret

6
io.h Normal file
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@ -0,0 +1,6 @@
#ifndef INCLUDE_IO_H
#define INCLUDE_IO_H
void out_buffer(unsigned short port, unsigned char data);
#endif

16
loader.asm
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@ -20,22 +20,6 @@ align 4
dd CHECKSUM
loader:
mov al, 14
mov dx, 0x3d4
out dx, al ; 14 tells the framebuffer to expect the highest 8 bits of the position
mov al, 0
mov dx, 0x3d5
out dx, al ; sending the highest 8 bits of 0x0050
mov al, 15
mov dx, 0x3d4
out dx, al ; 15 tells the framebuffer to expect the lowest 8 bits of the position
mov al, 0
mov dx, 0x3d5
out dx, al ; sending the lowest 8 bits of 0x0050
call test_fb
.loop: