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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Description: Interrupt registration core
* Author: Ian Marco Moffett
*/
#include <sys/types.h>
#include <machine/intr.h>
#include <machine/ioapic.h>
#include <os/kalloc.h>
#include <string.h>
/* List of interrupt handlers */
struct intr_hand *g_intrs[256] = {0};
struct intr_hand *
intr_register(const struct intr_hand *ih)
{
struct intr_hand *ih_new = NULL;
int gsi;
uint8_t vec;
if (ih == NULL) {
return NULL;
}
/* Allocate a new interrupt handler */
ih_new = kalloc(sizeof(*ih_new));
if (ih_new == NULL) {
return NULL;
}
memset(ih_new, 0, sizeof(*ih_new));
/*
* The first 0x20 to 0x5F interrupt vectors are
* reserved for I/O APIC input pins
*/
vec = MAX(ih->ipl << IPL_SHIFT, 0x60);
/*
* We can have up to 15 interrupt vectors per
* priority level as only 4 bits encode the IPL
*/
for (int i = vec; i < vec + 16; ++i) {
if (g_intrs[i] != NULL) {
continue;
}
ih_new->name = strdup(ih->name);
ih_new->ipl = ih->ipl;
ih_new->irq = ih->irq;
ih_new->count = ih->count;
ih_new->vector = i;
g_intrs[i] = ih_new;
if (ih->irq >= 0) {
ioapic_route_vec(ih->irq, ih_new->vector);
gsi = ioapic_get_gsi(ih->irq);
ioapic_gsi_mask(gsi, 0);
}
return ih_new;
}
return NULL;
}
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