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Diffstat (limited to 'pic.h')
| -rw-r--r-- | pic.h | 59 |
1 files changed, 59 insertions, 0 deletions
@@ -0,0 +1,59 @@ +/* + * VBMouse - Programmable Interrupt Controller routines + * Copyright (C) 2022 Javier S. Pedro + * + * 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 2 + * 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, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#ifndef PIC_H +#define PIC_H + +#include <conio.h> + +// TODO Currently do not support secondary PIC + +enum { + PIC1_CMD_IOPORT = 0x20, + PIC1_DATA_IOPORT = PIC1_CMD_IOPORT+1, + PIC2_CMD_IOPORT = 0xA0, + PIC2_DATA_IOPORT = PIC2_CMD_IOPORT+1, +}; + +enum PIC_CMDS { + /** End-Of-Interrupt command. */ + PIC_CMD_EOI = 0x20 +}; + +static void pic_mask_irq(unsigned irq) +{ + uint8_t mask = inp(PIC1_DATA_IOPORT); + mask |= (1 << irq); + outp(PIC1_DATA_IOPORT, mask); +} + +static void pic_unmask_irq(unsigned irq) +{ + uint8_t mask = inp(PIC1_DATA_IOPORT); + mask &= ~(1 << irq); + outp(PIC1_DATA_IOPORT, mask); +} + +static void pic_eoi_irq(unsigned irq) +{ + (void) irq; + outp(PIC1_CMD_IOPORT, PIC_CMD_EOI); +} + +#endif // PIC_H |