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os-k/kaleid/kernel/io/keyb.c
2021-03-04 20:05:53 +01:00

136 lines
4.2 KiB
C

//----------------------------------------------------------------------------//
// OS on Kaleid //
// //
// Desc: Basic Keyboard Driver //
// //
// //
// Copyright © 2018-2021 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K 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 //
// any later version. //
// //
// OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
#include <libbuf.h>
#include <io/keyb.h>
#include <ke/idt.h>
#include "scan.c"
#define KEY(code) (table[2*(code)])
#define FLAGS(code) (table[2*(code)+1])
static bool capsLockActive = 0;
static bool e0received = 0;
static bool altPressed = 0;
static bool altGrPressed = 0;
static bool shiftPressed = 0;
static bool controlPressed = 0;
static void KeybPrint(uchar _code)
{
uint code = (uint)_code;
const uint *table;
if (!e0received) {
table = (altPressed ? LeftAltScanCodes
: (controlPressed ? LeftControlScanCodes
: (shiftPressed ? LeftShiftScanCodes
: (altGrPressed ? AltGrScanCodes
: RegularScanCodes))));
} else {
table = E0ScanCodes;
e0received = 0;
}
if ((capsLockActive && (FLAGS(code) & CAPSLOCK))
&& !(altPressed || controlPressed)) {
if (shiftPressed)
table = RegularScanCodes;
else
table = LeftShiftScanCodes;
}
uchar ch = KEY(code);
if (!ch) {
switch (code) {
case 0xE0: e0received = 1; break;
case 0x38: if (table == E0ScanCodes) altGrPressed = 1;
else altPressed = 1;
break;
case 0xB8: if (table == E0ScanCodes) altGrPressed = 0;
else altPressed = 0;
break;
case 0x36: case 0x2A: shiftPressed = 1; break;
case 0xB6: case 0xAA: shiftPressed = 0; break;
case 0x1D: controlPressed = 1; break;
case 0x9D: controlPressed = 0; break;
case 0x3A: capsLockActive = !capsLockActive; break;
}
return;
}
bputc(BStdIn, ch);
}
static void KeybHandler(ISRFrame_t *regs)
{
char status;
uchar code = 0;
// write EOI
IoWriteByteOnPort(0x20, 0x20);
status = IoReadByteFromPort(0x64);
if (status & 0x01) {
code = IoReadByteFromPort(0x60);
}
KeybPrint(code);
KeSendEOItoPIC(0x21);
}
void IoCreateInputBuffer(void)
{
error_t rc;
rc = BOpenPureBuf(&BStdIn, BS_RDWR, 4 * KB);
if (rc < EOK) KeStartPanic("[Keyb] Couldn't create BStdIn");
//BEnableLineBuffering(BStdIn);
BStdIn->flusher = bemptybuf;
}
void IoEnableKeyb(void)
{
ulong flags = KePauseIRQs();
KeRegisterISR(KeybHandler, 0x21);
KeUnmaskIRQ(0x1);
KeRestoreIRQs(flags);
KeEnableNMI();
IoCreateInputBuffer();
}