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#include <minix/minlib.h>
#include <minix/cpufeature.h>
#include <machine/partition.h>
#include "string.h"
#include "direct_utils.h"
#include "serial.h"
#include "glo.h"
/* Give non-zero values to avoid them in BSS */
static int print_line = 1, print_col = 1;
#include <sys/video.h>
extern char *video_mem;
#define VIDOFFSET(line, col) ((line) * MULTIBOOT_CONSOLE_COLS * 2 + (col) * 2)
#define VIDSIZE VIDOFFSET(MULTIBOOT_CONSOLE_LINES-1,MULTIBOOT_CONSOLE_COLS-1)
void direct_put_char(char c, int line, int col)
{
int offset = VIDOFFSET(line, col);
video_mem[offset] = c;
video_mem[offset+1] = 0x07; /* grey-on-black */
}
static char direct_get_char(int line, int col)
{
return video_mem[VIDOFFSET(line, col)];
}
void direct_cls(void)
{
/* Clear screen */
int i,j;
for(i = 0; i < MULTIBOOT_CONSOLE_COLS; i++)
for(j = 0; j < MULTIBOOT_CONSOLE_LINES; j++)
direct_put_char(' ', j, i);
print_line = print_col = 0;
/* Tell video hardware origin is 0. */
outb(C_6845+INDEX, VID_ORG);
outb(C_6845+DATA, 0);
outb(C_6845+INDEX, VID_ORG+1);
outb(C_6845+DATA, 0);
}
static void direct_scroll_up(int lines)
{
int i, j;
for (i = 0; i < MULTIBOOT_CONSOLE_LINES; i++ ) {
for (j = 0; j < MULTIBOOT_CONSOLE_COLS; j++ ) {
char c = 0;
if(i < MULTIBOOT_CONSOLE_LINES-lines)
c = direct_get_char(i + lines, j);
direct_put_char(c, i, j);
}
}
print_line-= lines;
}
void direct_print_char(char c)
{
while (print_line >= MULTIBOOT_CONSOLE_LINES)
direct_scroll_up(1);
#define TABWIDTH 8
if(c == '\t') {
if(print_col >= MULTIBOOT_CONSOLE_COLS - TABWIDTH) {
c = '\n';
} else {
do {
direct_put_char(' ', print_line, print_col++);
} while(print_col % TABWIDTH);
return;
}
}
if (c == '\n') {
while (print_col < MULTIBOOT_CONSOLE_COLS)
direct_put_char(' ', print_line, print_col++);
print_line++;
print_col = 0;
return;
}
direct_put_char(c, print_line, print_col++);
if (print_col >= MULTIBOOT_CONSOLE_COLS) {
print_line++;
print_col = 0;
}
while (print_line >= MULTIBOOT_CONSOLE_LINES)
direct_scroll_up(1);
}
void direct_print(const char *str)
{
while (*str) {
direct_print_char(*str);
str++;
}
}
/* Standard and AT keyboard. (PS/2 MCA implies AT throughout.) */
#define KEYBD 0x60 /* I/O port for keyboard data */
#define KB_STATUS 0x64 /* I/O port for status on AT */
#define KB_OUT_FULL 0x01 /* status bit set when keypress char pending */
#define KB_AUX_BYTE 0x20 /* Auxiliary Device Output Buffer Full */
int direct_read_char(unsigned char *ch)
{
unsigned long sb;
sb = inb(KB_STATUS);
if (!(sb & KB_OUT_FULL)) {
return 0;
}
inb(KEYBD);
if (!(sb & KB_AUX_BYTE))
return 1;
return 0;
}
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