mirror of
https://github.com/xcat2/xNBA.git
synced 2024-12-15 07:41:45 +00:00
113 lines
1.9 KiB
C
113 lines
1.9 KiB
C
/* Minimal polling PC keyboard driver
|
|
* - No interrupt
|
|
* - No LED
|
|
* - No special keys
|
|
*
|
|
* still Enough For Me to type a filename.
|
|
*
|
|
* 2003-07 by SONE Takesh
|
|
* 2004-04 moved by LYH From filo to Etherboot
|
|
* yhlu@tyan.com
|
|
*/
|
|
|
|
#include "io.h"
|
|
#include "console.h"
|
|
|
|
static char key_map[][128] = {
|
|
{
|
|
"\0\x1b""1234567890-=\b\t"
|
|
"qwertyuiop[]\r\0as"
|
|
"dfghjkl;'`\0\\zxcv"
|
|
"bnm,./\0*\0 \0\0\0\0\0\0"
|
|
"\0\0\0\0\0\0\0""789-456+1"
|
|
"230."
|
|
},{
|
|
"\0\x1b""!@#$%^&*()_+\b\t"
|
|
"QWERTYUIOP{}\r\0AS"
|
|
"DFGHJKL:\"~\0|ZXCV"
|
|
"BNM<>?\0\0\0 \0\0\0\0\0\0"
|
|
"\0\0\0\0\0\0\0""789-456+1"
|
|
"230."
|
|
}
|
|
};
|
|
|
|
static int cur_scan;
|
|
static unsigned int shift_state;
|
|
#define SHIFT 1
|
|
#define CONTROL 2
|
|
#define CAPS 4
|
|
|
|
static int get_scancode(void)
|
|
{
|
|
int scan;
|
|
|
|
if ((inb(0x64) & 1) == 0)
|
|
return 0;
|
|
scan = inb(0x60);
|
|
|
|
switch (scan) {
|
|
case 0x2a:
|
|
case 0x36:
|
|
shift_state |= SHIFT;
|
|
break;
|
|
case 0xaa:
|
|
case 0xb6:
|
|
shift_state &= ~SHIFT;
|
|
break;
|
|
case 0x1d:
|
|
shift_state |= CONTROL;
|
|
break;
|
|
case 0x9d:
|
|
shift_state &= ~CONTROL;
|
|
break;
|
|
case 0x3a:
|
|
shift_state ^= CAPS;
|
|
break;
|
|
}
|
|
|
|
if (scan & 0x80)
|
|
return 0; /* ignore break code or 0xe0 etc! */
|
|
return scan;
|
|
}
|
|
|
|
static int kbd_havekey(void)
|
|
{
|
|
if (!cur_scan)
|
|
cur_scan = get_scancode();
|
|
return cur_scan != 0;
|
|
}
|
|
|
|
static int kbd_ischar(void)
|
|
{
|
|
if (!kbd_havekey())
|
|
return 0;
|
|
if (!key_map[shift_state & SHIFT][cur_scan]) {
|
|
cur_scan = 0;
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int kbd_getc(void)
|
|
{
|
|
int c;
|
|
|
|
while (!kbd_ischar())
|
|
;
|
|
c = key_map[shift_state & SHIFT][cur_scan];
|
|
if (shift_state & (CONTROL | CAPS)) {
|
|
if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) {
|
|
if (shift_state & CONTROL)
|
|
c &= 0x1f;
|
|
else if (shift_state & CAPS)
|
|
c ^= ('A' ^ 'a');
|
|
}
|
|
}
|
|
cur_scan = 0;
|
|
return c;
|
|
}
|
|
|
|
struct console_driver pc_kbd_console __console_driver = {
|
|
.getchar = kbd_getc,
|
|
};
|