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/*
* Copyright (c) 2023 Ian Marco Moffett and the VegaOS 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 VegaOS 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.
*/
#include <firmware/acpi/acpi.h>
#include <firmware/acpi/tables.h>
#include <machine/ioapic.h>
#include <sys/cdefs.h>
#include <sys/panic.h>
#include <sys/syslog.h>
#define APIC_TYPE_LOCAL_APIC 0
#define APIC_TYPE_IO_APIC 1
#define APIC_TYPE_INTERRUPT_OVERRIDE 2
__MODULE_NAME("acpi");
__KERNEL_META("$Vega$: acpi_madt.c, Ian Marco Moffett, "
"ACPI MADT parsing");
static struct acpi_madt *madt = NULL;
static void
do_parse(void)
{
uint8_t *cur = NULL;
uint8_t *end = NULL;
struct apic_header *hdr = NULL;
struct ioapic *ioapic = NULL;
void *ioapic_mmio_base = NULL;
cur = (uint8_t *)(madt + 1);
end = (uint8_t *)madt + madt->hdr.length;
while (cur < end) {
hdr = (void *)cur;
switch (hdr->type) {
case APIC_TYPE_IO_APIC:
/*
* TODO: Figure out how to use multiple
* I/O APICs.
*/
if (ioapic != NULL) {
break;
}
ioapic = (struct ioapic *)cur;
KINFO("Detected I/O APIC (id=%d, gsi_base=%d)\n",
ioapic->ioapic_id, ioapic->gsi_base);
ioapic_mmio_base = (void *)(uintptr_t)ioapic->ioapic_addr;
ioapic_set_base(ioapic_mmio_base);
break;
}
cur += hdr->length;
}
}
/*
* Converts IRQ numbers to its corresponding
* Global System Interrupt (GSI) number.
*
* @irq: IRQ number.
*/
uint32_t
irq_to_gsi(uint8_t irq)
{
struct apic_header *hdr = NULL;
struct interrupt_override *override = NULL;
uint8_t *cur = NULL;
uint8_t *end = NULL;
cur = (uint8_t *)(madt + 1);
end = (uint8_t *)madt + madt->hdr.length;
while (cur < end) {
hdr = (void *)cur;
switch (hdr->type) {
case APIC_TYPE_INTERRUPT_OVERRIDE:
override = (struct interrupt_override *)cur;
if (override->source == irq) {
return override->interrupt;
}
}
cur += hdr->length;
}
return irq;
}
void
acpi_parse_madt(void)
{
/* Prevent this function from running twice */
if (madt != NULL) {
return;
}
madt = acpi_query("APIC");
if (madt == NULL) {
panic("Failed to query for ACPI MADT\n");
}
do_parse();
}
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