137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
/*
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Copyright 2025 Kamil Kowalczyk
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Redistribution and use in source and binary forms, with or
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without modification, are permitted provided that the following
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conditions are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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“AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <libk/types.h>
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#include <sys/pic.h>
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#include <sys/ioport.h>
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#include <sys/isr.h>
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#define PIC1 0x20
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#define PIC2 0xA0
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#define PIC1_CMD PIC1
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#define PIC1_DATA (PIC1 + 1)
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#define PIC2_CMD PIC2
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#define PIC2_DATA (PIC2 + 1)
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#define PIC_EOI 0x20
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#define ICW1_ICW4 0x01
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#define ICW1_SINGLE 0x02
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#define ICW1_INTVL4 0x04
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#define ICW1_LEVEL 0x08
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#define ICW1_INIT 0x10
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#define ICW4_8086 0x01
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#define ICW4_AUTO 0x02
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#define ICW4_BUFSLAVE 0x08
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#define ICW4_BUFMASER 0x0C
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#define ICW4_SFNM 0x10
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#define CASCADE_IRQ 2
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static void pic_mask_all(void) {
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ioport_out8(PIC1_DATA, 0xFF);
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ioport_wait();
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ioport_out8(PIC2_DATA, 0xFF);
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ioport_wait();
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}
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void pic_init(void) {
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// remap & disable
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ioport_out8(PIC1_CMD, ICW1_INIT | ICW1_ICW4);
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ioport_wait();
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ioport_out8(PIC2_CMD, ICW1_INIT | ICW1_ICW4);
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ioport_wait();
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ioport_out8(PIC1_DATA, 0x20);
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ioport_wait();
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ioport_out8(PIC2_DATA, 0x28);
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ioport_wait();
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ioport_out8(PIC1_DATA, 1<<CASCADE_IRQ);
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ioport_wait();
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ioport_out8(PIC2_DATA, 2);
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ioport_wait();
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ioport_out8(PIC1_DATA, ICW4_8086);
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ioport_wait();
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ioport_out8(PIC2_DATA, ICW4_8086);
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ioport_wait();
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pic_mask_all();
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}
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void pic_unmask_irq(uint8_t irq) {
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uint16_t port;
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uint8_t value;
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irq -= 0x20;
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if (irq < 8) {
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port = PIC1_DATA;
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} else {
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port = PIC2_DATA;
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irq -= 8;
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}
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value = ioport_in8(port) & ~(1<<irq);
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ioport_out8(port, value);
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}
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void pic_mask_irq(uint8_t irq) {
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uint16_t port;
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uint8_t value;
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irq -= 0x20;
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if (irq < 8) {
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port = PIC1_DATA;
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} else {
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port = PIC2_DATA;
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irq -= 8;
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}
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value = ioport_in8(port) | (1<<irq);
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ioport_out8(port, value);
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}
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void pic_fini(uint8_t trap) {
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if (trap >= 40) {
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ioport_out8(PIC2_CMD, PIC_EOI);
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ioport_wait();
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}
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ioport_out8(PIC1_CMD, PIC_EOI);
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ioport_wait();
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}
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