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136 lines
4.2 KiB
C
136 lines
4.2 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: Basic Keyboard Driver //
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// //
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// //
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// Copyright © 2018-2020 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// any later version. //
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// //
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// OS/K is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY//without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <libbuf.h>
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#include <io/keyb.h>
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#include <ke/idt.h>
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#include "scan.c"
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#define KEY(code) (table[2*(code)])
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#define FLAGS(code) (table[2*(code)+1])
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static bool capsLockActive = 0;
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static bool e0received = 0;
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static bool altPressed = 0;
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static bool altGrPressed = 0;
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static bool shiftPressed = 0;
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static bool controlPressed = 0;
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static void KeybPrint(uchar _code)
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{
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uint code = (uint)_code;
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const uint *table;
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if (!e0received) {
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table = (altPressed ? LeftAltScanCodes
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: (controlPressed ? LeftControlScanCodes
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: (shiftPressed ? LeftShiftScanCodes
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: (altGrPressed ? AltGrScanCodes
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: RegularScanCodes))));
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} else {
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table = E0ScanCodes;
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e0received = 0;
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}
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if ((capsLockActive && (FLAGS(code) & CAPSLOCK))
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&& !(altPressed || controlPressed)) {
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if (shiftPressed)
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table = RegularScanCodes;
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else
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table = LeftShiftScanCodes;
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}
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uchar ch = KEY(code);
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if (!ch) {
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switch (code) {
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case 0xE0: e0received = 1; break;
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case 0x38: if (table == E0ScanCodes) altGrPressed = 1;
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else altPressed = 1;
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break;
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case 0xB8: if (table == E0ScanCodes) altGrPressed = 0;
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else altPressed = 0;
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break;
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case 0x36: case 0x2A: shiftPressed = 1; break;
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case 0xB6: case 0xAA: shiftPressed = 0; break;
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case 0x1D: controlPressed = 1; break;
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case 0x9D: controlPressed = 0; break;
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case 0x3A: capsLockActive = !capsLockActive; break;
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}
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return;
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}
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bputc(BStdIn, ch);
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}
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static void KeybHandler(ISRFrame_t *regs)
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{
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char status;
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uchar code = 0;
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// write EOI
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IoWriteByteOnPort(0x20, 0x20);
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status = IoReadByteFromPort(0x64);
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if (status & 0x01) {
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code = IoReadByteFromPort(0x60);
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}
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KeybPrint(code);
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KeSendEOItoPIC(0x21);
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}
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void IoCreateInputBuffer(void)
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{
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error_t rc;
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rc = BOpenPureBuf(&BStdIn, BS_RDWR, 4 * KB);
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if (rc) KeStartPanic("[Keyb] Couldn't create BStdIn");
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//BEnableLineBuffering(BStdIn);
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BStdIn->flusher = bemptybuf;
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}
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void IoEnableKeyb(void)
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{
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ulong flags = KePauseIRQs();
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KeRegisterISR(KeybHandler, 0x21);
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KeUnmaskIRQ(0x1);
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KeRestoreIRQs(flags);
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KeEnableNMI();
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IoCreateInputBuffer();
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}
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