Ncio.c

#include "ncio.h"
enum vga_color
{
	COLOR_BLACK = 0,
	COLOR_BLUE = 1,
	COLOR_GREEN = 2,
	COLOR_CYAN = 3,
	COLOR_RED = 4,
	COLOR_MAGENTA = 5,
	COLOR_BROWN = 6,
	COLOR_LIGHT_GREY = 7,
	COLOR_DARK_GREY = 8,
	COLOR_LIGHT_BLUE = 9,
	COLOR_LIGHT_GREEN = 10,
	COLOR_LIGHT_CYAN = 11,
	COLOR_LIGHT_RED = 12,
	COLOR_LIGHT_MAGENTA = 13,
	COLOR_LIGHT_BROWN = 14,
	COLOR_WHITE = 15,
};
 
uint8_t make_color(enum vga_color fg, enum vga_color bg)
{
	return fg | bg << 4;
}
 
uint16_t make_vgaentry(char c, uint8_t color)
{
	uint16_t c16 = c;
	uint16_t color16 = color;
	return c16 | color16 << 8;
}
 
size_t strlen(const char* str)
{
	size_t ret = 0;
	while ( str[ret] != 0 )
		ret++;
	return ret;
}
 
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 24;
 
size_t terminal_row;
size_t terminal_column;
uint8_t terminal_color;
uint16_t* terminal_buffer;
 
void nc_tinit()
{
	terminal_row = 0;
	terminal_column = 0;
	terminal_color = make_color(COLOR_LIGHT_GREY, COLOR_BLACK);
	terminal_buffer = (uint16_t*) 0xB8000;
	size_t x,y;
	for ( y = 0; y < VGA_HEIGHT; y++ )
	{
		for (  x = 0; x < VGA_WIDTH; x++ )
		{
			const size_t index = y * VGA_WIDTH + x;
			terminal_buffer[index] = make_vgaentry(' ', terminal_color);
		}
	}
}
 
void terminal_setcolor(uint8_t color)
{
	terminal_color = color;
}
 
void terminal_putentryat(char c, uint8_t color, size_t x, size_t y)
{
	const size_t index = y * VGA_WIDTH + x;
	terminal_buffer[index] = make_vgaentry(c, color);
}
 
void terminal_putchar(char c)
{
if(c=='\n')
{
terminal_row++;
return;
}
	terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
	if ( ++terminal_column == VGA_WIDTH )
	{
		terminal_column = 0;
		if ( ++terminal_row == VGA_HEIGHT )
		{
			terminal_row = 0;
		}
	}
}
 
void nc_tprintf(char* data)
{
	size_t datalen = strlen(data);
	size_t i;
	for ( i = 0; i < datalen; i++ )
		terminal_putchar(data[i]);
}
void nc_tscanf(char* buff)
{
	while(kread_buffer[0] == 0) pushbuf();
	int i= 0;
	while(kread_buffer[i] !=0)
	{
	buff[i] = kread_buffer[i];
	kread_buffer[i] = 0;
	i++;
	}
}
inline char inb(unsigned int port)
{
	char ret;

	__asm__ volatile("inb %%dx,%%al":"=a"(port),"=d"(ret));

	return ret;
}
inline void outb(unsigned int port, unsigned char data)
{
	__asm__ volatile("outb %%al,%%dx"::"d"(data),"a"(port));
}