+++ /dev/null
-/*
-pcboot - bootable PC demo/game kernel
-Copyright (C) 2018-2019 John Tsiombikas <nuclear@member.fsf.org>
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY, without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program. If not, see <https://www.gnu.org/licenses/>.
-*/
-#include <stdio.h>
-#include <string.h>
-#include "keyb.h"
-#include "intr.h"
-#include "asmops.h"
-#include "kbregs.h"
-#include "kbscan.h"
-#include "power.h"
-#include "panic.h"
-
-#define delay7us() \
- do { \
- iodelay(); iodelay(); iodelay(); iodelay(); \
- iodelay(); iodelay(); iodelay(); \
- } while(0)
-
-static void set_ccb(unsigned char ccb);
-static unsigned char get_ccb(void);
-
-static void kbintr();
-
-#define BUFSZ 64
-#define ADVANCE(x) ((x) = ((x) + 1) & (BUFSZ - 1))
-
-static int buffer[BUFSZ];
-static int buf_ridx, buf_widx;
-
-static unsigned int num_pressed;
-static unsigned char keystate[256];
-
-
-void kb_init(void)
-{
- buf_ridx = buf_widx = 0;
- num_pressed = 0;
- memset(keystate, 0, sizeof keystate);
-
- /* make sure set1 translation is enabled */
- kb_set_translate(1);
-
- interrupt(IRQ_TO_INTR(KB_IRQ), kbintr);
- kb_intr_enable();
- unmask_irq(KB_IRQ);
-}
-
-void kb_intr_enable(void)
-{
- unsigned char ccb = get_ccb();
- ccb |= KB_CCB_KB_INTREN;
- set_ccb(ccb);
-}
-
-void kb_intr_disable(void)
-{
- unsigned char ccb = get_ccb();
- ccb &= ~KB_CCB_KB_INTREN;
- set_ccb(ccb);
-}
-
-int kb_setmode(int mode)
-{
- kb_send_data(0xf0);
- if(!kb_wait_read() || kb_read_data() != KB_ACK) {
- return -1;
- }
- kb_send_data(mode);
- if(!kb_wait_read() || kb_read_data() != KB_ACK) {
- return -1;
- }
- return 0;
-}
-
-int kb_getmode(void)
-{
- int mode;
-
- kb_send_data(0xf0);
- if(!kb_wait_read() || kb_read_data() != KB_ACK) {
- return -1;
- }
- kb_send_data(0);
- if(!kb_wait_read() || kb_read_data() != KB_ACK) {
- return -1;
- }
- mode = kb_read_data();
-
- switch(mode) {
- case 0x43: return 1;
- case 0x41: return 2;
- case 0x3f: return 3;
- default:
- break;
- }
- return mode;
-}
-
-void kb_set_translate(int xlat)
-{
- unsigned char ccb = get_ccb();
- if(xlat) {
- ccb |= KB_CCB_KB_XLAT;
- } else {
- ccb &= ~KB_CCB_KB_XLAT;
- }
- set_ccb(ccb);
-}
-
-int kb_get_translate(void)
-{
- return get_ccb() & KB_CCB_KB_XLAT;
-}
-
-int kb_isdown(int key)
-{
- switch(key) {
- case KB_ANY:
- return num_pressed;
-
- case KB_ALT:
- return keystate[KB_LALT] + keystate[KB_RALT];
-
- case KB_CTRL:
- return keystate[KB_LCTRL] + keystate[KB_RCTRL];
- }
- return keystate[key];
-}
-
-void kb_wait(void)
-{
- int key;
- while((key = kb_getkey()) == -1) {
- /* put the processor to sleep while waiting for keypresses, but first
- * make sure interrupts are enabled, or we'll sleep forever
- */
- enable_intr();
- halt_cpu();
- }
- kb_putback(key);
-}
-
-int kb_getkey(void)
-{
- int res;
-
- if(buf_ridx == buf_widx) {
- return -1;
- }
- res = buffer[buf_ridx];
- ADVANCE(buf_ridx);
- return res;
-}
-
-void kb_putback(int key)
-{
- /* go back a place */
- if(--buf_ridx < 0) {
- buf_ridx += BUFSZ;
- }
-
- /* if the write end hasn't caught up with us, go back one place
- * and put it there, otherwise just overwrite the oldest key which
- * is right where we were.
- */
- if(buf_ridx == buf_widx) {
- ADVANCE(buf_ridx);
- }
-
- buffer[buf_ridx] = key;
-}
-
-int kb_wait_write(void)
-{
- int i;
- for(i=0; i<32768; i++) {
- if(!(inp(KB_STATUS_PORT) & KB_STAT_INBUF_FULL)) {
- return 1;
- }
- iodelay();
- }
- /*printf("kb_wait_write timeout\n");*/
- return 0;
-}
-
-int kb_wait_read(void)
-{
- int i;
- for(i=0; i<32768; i++) {
- if((inp(KB_STATUS_PORT) & KB_STAT_OUTBUF_FULL)) {
- return 1;
- }
- iodelay();
- }
- /*printf("kb_wait_read timeout\n");*/
- return 0;
-}
-
-void kb_send_cmd(unsigned char cmd)
-{
- kb_wait_write();
- outp(KB_CMD_PORT, cmd);
-}
-
-void kb_send_data(unsigned char data)
-{
- kb_wait_write();
- outp(KB_DATA_PORT, data);
-}
-
-unsigned char kb_read_data(void)
-{
- kb_wait_read();
- delay7us();
- return inp(KB_DATA_PORT);
-}
-
-static void set_ccb(unsigned char ccb)
-{
- kb_send_cmd(KB_CMD_SET_CMDBYTE);
- kb_send_data(ccb);
-
- if(kb_wait_read()) {
- kb_read_data();
- }
-}
-
-static unsigned char get_ccb(void)
-{
- kb_send_cmd(KB_CMD_GET_CMDBYTE);
- return kb_read_data();
-}
-
-static void kbintr()
-{
- unsigned char code;
- int key, press;
- static int ext = 0;
-
- code = inp(KB_DATA_PORT);
-
- if(code == 0xe0) {
- ext = 1;
- return;
- }
-
- if(code & 0x80) {
- press = 0;
- code &= 0x7f;
-
- if(num_pressed > 0) {
- num_pressed--;
- }
- } else {
- press = 1;
-
- num_pressed++;
- }
-
- if(!ext) {
- key = code < 0x59 ? scantbl_set1[code] : 0;
- } else {
- switch(code) {
- case 0x1c: key = '\r'; break;
- case 0x1d: key = KB_RCTRL; break;
- //case 0x35: key = KB_NUM_MINUS; break;
- //case 0x37: key = KB_SYSRQ; break;
- case 0x38: key = KB_RALT; break;
- case 0x47: key = KB_HOME; break;
- case 0x48: key = KB_UP; break;
- case 0x49: key = KB_PGUP; break;
- case 0x4b: key = KB_LEFT; break;
- case 0x4d: key = KB_RIGHT; break;
- case 0x4f: key = KB_END; break;
- case 0x50: key = KB_DOWN; break;
- case 0x51: key = KB_PGDN; break;
- case 0x52: key = KB_INSERT; break;
- case 0x53: key = KB_DEL; break;
- default:
- key = 0;
- }
- ext = 0;
- }
-
- if(press) {
- if(key == KB_DEL && (keystate[KB_LALT] || keystate[KB_RALT]) && (keystate[KB_LCTRL] || keystate[KB_RCTRL])) {
- reboot();
- }
- /* append to buffer */
- buffer[buf_widx] = key;
- ADVANCE(buf_widx);
- /* if the write end overtook the read end, advance the read end
- * too, to discard the oldest keypress from the buffer
- */
- if(buf_widx == buf_ridx) {
- ADVANCE(buf_ridx);
- }
- }
-
- /* and update keystate table */
- keystate[key] = press;
-}
projects / com32 / blobdiff