Chloe M.
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/*
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* Copyright (c) 2026, Chloe M.
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* Provided under the BSD-3 clause.
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*
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* Description: IRQ chip management
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* Author: Chloe M.
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*/
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#include <drivers/acpi/tables.h>
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#include <drivers/acpi/acpi.h>
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#include <machine/irqchip.h>
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#include <machine/pio.h>
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#include <ke/knot.h>
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#include <ex/trace.h>
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/* PIC data ports */
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#define PIC_MASTER_DATA 0x21
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#define PIC_SLAVE_DATA 0xA1
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#define DTRACE(Fmt, ...) \
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TRACE("[ IRQCHIP ]: " Fmt, ##__VA_ARGS__)
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/* Set if dual i8259 is present */
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#define MADT_PCAT_COMPAT BIT(0)
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VOID
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MdIrqChipInit(VOID)
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{
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ACPI_MADT *Madt;
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Madt = AcpiQuery("APIC");
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if (Madt == NULL) {
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KeKnot(
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KNOT_UNBOUND_RSRC,
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"could not locate ACPI MADT\n"
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);
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}
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/*
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* If we have a dual-i8259 configuration present on the
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* machine, we'll want to disable it so it doesn't mess
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* up Local APIC operation and such.
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*/
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if (ISSET(Madt->Flags, MADT_PCAT_COMPAT)) {
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DTRACE("detected dual i8259; disabling...\n");
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MdOutb(PIC_MASTER_DATA, 0xFF);
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MdOutb(PIC_SLAVE_DATA, 0xFF);
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}
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}
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