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i8259.c
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/
i8259.c
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/* OS134, Copyright (C) 2005, Benjamin Stein, Jaap Weel, Ting Liao --
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
* i8259A programmable interrupt controller (PIC). Documented in the
* 8259A/8259A-2 datasheet, order number 231468-003 from Intel.
*/
#include "std.h"
#include "i80386.h"
#include "interrupt.h"
#include "term.h"
#include "i8259.h"
void irq0_handler(interrupt_error_code n);
void irq1_handler(interrupt_error_code n);
void irq2_handler(interrupt_error_code n);
void irq3_handler(interrupt_error_code n);
void irq4_handler(interrupt_error_code n);
void irq5_handler(interrupt_error_code n);
void irq6_handler(interrupt_error_code n);
void irq7_handler(interrupt_error_code n);
void irq8_handler(interrupt_error_code n);
void irq9_handler(interrupt_error_code n);
void irq10_handler(interrupt_error_code n);
void irq11_handler(interrupt_error_code n);
void irq12_handler(interrupt_error_code n);
void irq13_handler(interrupt_error_code n);
void irq14_handler(interrupt_error_code n);
void irq15_handler(interrupt_error_code n);
void eoi(char);
void default_irq_handler(void);
void initialize_irq_handler_table(void);
make_array(irq_handler, irq_handler_table, 16);
general_error irq_init(void)
{
/* Send both PICs initialization word ICW1. */
outb(IRQ_MASTER | IRQ_CMD, IRQ_ICW1 | IRQ_ICW4_COMING);
outb(IRQ_SLAVE | IRQ_CMD, IRQ_ICW1 | IRQ_ICW4_COMING);
/* Send both PICs remapping information. */
outb(IRQ_MASTER | IRQ_DATA, IRQ_REMAP_MASK & 0x20);
outb(IRQ_SLAVE | IRQ_DATA, IRQ_REMAP_MASK & 0x2F);
/* Tell both PICs where the slave is mapped. */
outb(IRQ_MASTER | IRQ_DATA, IRQ_SLAVE_IS2);
outb(IRQ_SLAVE | IRQ_DATA, IRQ_SLAVEID_2);
/* Send both PICs some more configuration data. */
outb(IRQ_MASTER | IRQ_DATA, (IRQ_NONBUFFERED |
IRQ_NORMAL_EOI |
IRQ_8086_MODE));
outb(IRQ_SLAVE | IRQ_DATA, (IRQ_NONBUFFERED |
IRQ_NORMAL_EOI |
IRQ_8086_MODE));
/* Turn on only the keyboard IRQ. */
outb(IRQ_MASTER | IRQ_DATA, ~IRQ_MASTER_IRQ(IRQ_KEYBOARD));
outb(IRQ_SLAVE | IRQ_DATA, ~IRQ_SLAVE_IRQ(IRQ_KEYBOARD));
/* Install handlers for all IRQs. In principle, whenever an IRQ
* is turned on by a driver, it should also install a handler,
* but who knows, maybe it won't. This way, we are not stuck with
* the very generic unhandled-interrupt routine, but something
* slightly more infomative. */
interrupt_install_handler(0x20, &irq0_handler);
interrupt_install_handler(0x21, &irq1_handler);
interrupt_install_handler(0x22, &irq2_handler);
interrupt_install_handler(0x23, &irq3_handler);
interrupt_install_handler(0x24, &irq4_handler);
interrupt_install_handler(0x25, &irq5_handler);
interrupt_install_handler(0x26, &irq6_handler);
interrupt_install_handler(0x27, &irq7_handler);
interrupt_install_handler(0x28, &irq8_handler);
interrupt_install_handler(0x29, &irq9_handler);
interrupt_install_handler(0x2a, &irq10_handler);
interrupt_install_handler(0x2b, &irq11_handler);
interrupt_install_handler(0x2c, &irq12_handler);
interrupt_install_handler(0x2d, &irq13_handler);
interrupt_install_handler(0x2e, &irq14_handler);
interrupt_install_handler(0x2f, &irq15_handler);
/* Now install the individual handlers. */
unsigned int i;
for (i = 0; i < 16; i++)
install_irq_handler(i, &default_irq_handler);
return GENERAL_OK;
}
void eoi(char whichpic)
{
outb(whichpic | IRQ_CMD, IRQ_OCW2_NONSPECIFIC_EOI);
}
array_error install_irq_handler (irq_t irq, irq_handler handler)
{
return aset(irq_handler_table,irq,handler);
}
void default_irq_handler(void)
{
print("Unhandled IRQ.\n");
/* Do nothing. */
}
void irq0_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
irq_handler current_irq_handler;
aref(irq_handler_table,0,current_irq_handler);
(*current_irq_handler)();
}
void irq1_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
irq_handler current_irq_handler;
aref(irq_handler_table,1,current_irq_handler);
(*current_irq_handler)();
}
void irq2_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
irq_handler current_irq_handler;
aref(irq_handler_table,2,current_irq_handler);
(*current_irq_handler)();
}
void irq3_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
irq_handler current_irq_handler;
aref(irq_handler_table,3,current_irq_handler);
(*current_irq_handler)();
}
void irq4_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
irq_handler current_irq_handler;
aref(irq_handler_table,4,current_irq_handler);
(*current_irq_handler)();
}
void irq5_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
irq_handler current_irq_handler;
aref(irq_handler_table,5,current_irq_handler);
(*current_irq_handler)();
}
void irq6_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
irq_handler current_irq_handler;
aref(irq_handler_table,6,current_irq_handler);
(*current_irq_handler)();
}
void irq7_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
irq_handler current_irq_handler;
aref(irq_handler_table,7,current_irq_handler);
(*current_irq_handler)();
}
void irq8_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
eoi(IRQ_SLAVE);
irq_handler current_irq_handler;
aref(irq_handler_table,8,current_irq_handler);
(*current_irq_handler)();
}
void irq9_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
eoi(IRQ_SLAVE);
irq_handler current_irq_handler;
aref(irq_handler_table,9,current_irq_handler);
(*current_irq_handler)();
}
void irq10_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
eoi(IRQ_SLAVE);
irq_handler current_irq_handler;
aref(irq_handler_table,10,current_irq_handler);
(*current_irq_handler)();
}
void irq11_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
eoi(IRQ_SLAVE);
irq_handler current_irq_handler;
aref(irq_handler_table,11,current_irq_handler);
(*current_irq_handler)();
}
void irq12_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
eoi(IRQ_SLAVE);
irq_handler current_irq_handler;
aref(irq_handler_table,12,current_irq_handler);
(*current_irq_handler)();
}
void irq13_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
eoi(IRQ_SLAVE);
irq_handler current_irq_handler;
aref(irq_handler_table,13,current_irq_handler);
(*current_irq_handler)();
}
void irq14_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
eoi(IRQ_SLAVE);
irq_handler current_irq_handler;
aref(irq_handler_table,14,current_irq_handler);
(*current_irq_handler)();
}
void irq15_handler(interrupt_error_code n __attribute__((unused)))
{
eoi(IRQ_MASTER);
eoi(IRQ_SLAVE);
irq_handler current_irq_handler;
aref(irq_handler_table,15,current_irq_handler);
(*current_irq_handler)();
}