glm94/kernel3
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Fixed a bug that caused the kernel image to lose it multiboot signature. Added code to test printing a string to the screen.

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glm94
2020-05-09 21:55:51 -05:00
parent ff96bef431
commit 695bd77751
6 changed files with 50 additions and 13 deletions
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kernel/kmain.c
+32 -6
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@@ -1,13 +1,20 @@
#include "../includes/io.h"
#include "../includes/kernel.h"
void write_screen(unsigned int, char, unsigned char, unsigned char);
void move(unsigned short);
//char* msg = "Hello, World!";
extern void kmain()
void kmain()
{
write_screen(0, 'A', 2, 8);
move(80);
//asm("hlt");
draw_s("Hello, World!", 2, 9);/*
write_screen(0, "k", 2, 9);
write_screen(2, 'e', 2, 9);
write_screen(4, 'r', 2, 9);
write_screen(6, 'n', 2, 9);
write_screen(8, 'e', 2, 9);
write_screen(10, 'l', 2, 9);
write_screen(12, ' ', 2, 9);
write_screen(14, '3', 2, 9);
//asm("hlt");*/
}
void write_screen(unsigned int i, char c, unsigned char fg, unsigned char bg)
@@ -24,3 +31,22 @@ void move(unsigned short pos)
outb(0x3D4, 15);
outb(0x3D5, pos & 0x00FF);
}
void draw_s(char* string, unsigned char fg, unsigned char bg)
{
char *video_buffer = 0x000B8000;
for(int i = 0; i < strlen(string); i++)
{
video_buffer[i] = string[i];
video_buffer[i+1] = ((fg & 0x0f) << 4) | (bg & 0x0F);
}
}
int strlen(char* string)
{
int len = 0;
for(int i = 0; string[i] != '\0'; i++) len++;
return len;
}