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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* 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 the project 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 descriptor table core
* Author: Ian Marco Moffett
*/
#include <sys/types.h>
#include <machine/idt.h>
#include <machine/gdt.h>
static struct idt_entry idt[256];
static struct idtr idtr = {
.limit = sizeof(struct idt_entry) * 256 - 1,
.offset = (uintptr_t)&idt[0]
};
void
idt_set_desc(uint8_t vector, uint8_t type, uintptr_t isr, uint8_t ist)
{
struct idt_entry *desc;
if (vector >= 255) {
/* Invalid vector */
return;
}
desc = &idt[vector];
desc->off_low = isr & 0xFFFF;
desc->off_mid = (isr >> 16) & 0xFFFF;
desc->off_high = (isr >> 32) & 0xFFFFFFFF;
desc->segsel = KERNEL_CS;
desc->type = type;
desc->dpl = (type == IDT_USER_GATE) ? 3 : 0;
desc->p = 1;
desc->zero = 0;
desc->zero1 = 0;
desc->reserved = 0;
desc->ist = ist;
}
void
idt_load(void)
{
__ASMV("lidt %0" :: "m" (idtr) : "memory");
}
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