Robert Allan JamesandClaude Sonnet 5
88eb73cfe8
Punch list §25 item 4.3.5 complete. New ioapic.c/i8042.c drivers (MADT-derived I/O APIC base, no hardcoded constants) plus a KBD-SCAN/KBD-DEBUG diagnostic word pair. Three real bugs found and fixed en route, all blocking this item's own acceptance: a fatal LAPIC spurious-vector crash (nothing had driven a real external interrupt through the I/O APIC before), OVMF leaving the keyboard device itself scanning-disabled (0xF4 fix), and isr.S's stub table only having individually-numbered stubs through vector 32 -- everything above that, including our IRQ1 vector 33, silently reported as vector 255 regardless of which IDT slot actually fired. Verified live via QEMU sendkey against KBD-SCAN: correct XT Set-1 make/break codes for two different keys. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/*
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StarForth — Steady-State Virtual Machine Runtime
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Copyright (c) 2023–2025 Robert A. James
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All rights reserved.
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This file is part of the StarForth project.
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Licensed under the StarForth License, Version 1.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at:
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https://github.com/star.4th@proton.me/StarForth/LICENSE.txt
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This software is provided "AS IS", WITHOUT WARRANTY OF ANY KIND,
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express or implied, including but not limited to the warranties of
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merchantability, fitness for a particular purpose, and noninfringement.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* ioapic.h - I/O APIC interface (amd64 only)
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*
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* Item 4.3.5 (FABRIC.md §27.5): no I/O APIC driver existed anywhere in this
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* tree before this item. The Local APIC (apic.h) self-interrupts for the
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* timer and needs no routing; any *legacy* IRQ (i8042 keyboard's IRQ1
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* included) requires the I/O APIC to redirect it to a Local APIC vector.
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*/
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#ifndef STARKERNEL_IOAPIC_H
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#define STARKERNEL_IOAPIC_H
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#include <stdint.h>
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/**
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* Locate and map the I/O APIC via the ACPI MADT (parsed from @p acpi_rsdp).
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* Also captures any Interrupt Source Override entries so legacy ISA IRQs
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* with a non-default GSI/polarity/trigger mapping route correctly.
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*
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* @param acpi_rsdp BootInfo->acpi_table (RSDP), or NULL.
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* @return 0 on success, -1 if no MADT/I/O APIC entry was found.
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*/
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int ioapic_init(void *acpi_rsdp);
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/**
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* Program a redirection entry for a legacy ISA IRQ, initially masked.
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* Honors an Interrupt Source Override for @p isa_irq if the MADT had one
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* (different GSI, polarity, or trigger mode); otherwise uses the ISA
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* default (GSI == isa_irq, active-high, edge-triggered) per the ACPI
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* specification's "conforms to bus" default.
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*
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* @param isa_irq Legacy IRQ number (0-15).
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* @param vector IDT vector to deliver (e.g. 0x21).
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* @param dest_apic_id Destination Local APIC ID (see apic_id()).
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* @return 0 on success, -1 if ioapic_init() has not succeeded.
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*/
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int ioapic_route_legacy_irq(uint8_t isa_irq, uint8_t vector, uint8_t dest_apic_id);
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/**
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* Clear the mask bit on a previously routed legacy IRQ's redirection entry.
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* Call only after ioapic_route_legacy_irq() has programmed it.
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*/
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void ioapic_unmask_legacy_irq(uint8_t isa_irq);
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#endif /* STARKERNEL_IOAPIC_H */
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