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Added missing vectors

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This commit is contained in:
Pierre-Emmanuel Gob. 2026-09-18 20:31:46 +02:00
parent 29c79f20c2
commit 830613ccb6
2 changed files with 75 additions and 4 deletions
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29
include/idt.h
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@ -4,9 +4,12 @@
* Privileged primitive: `lidt` in idt_init(). Fault behavior: before
* idt_init() any exception triple-faults (no IDT); after, CPU vectors
* 0-31 land in the assembly stubs (isr.asm) and then in
* exception_handler(), which prints and halts. Vectors 32-255 are left
* zero (not present) on purpose because PIC remap + IRQ handling is a later step.
* exception_handler(), which prints and halts. Vectors 32-47 stay
* not-present until the 8259 PIC is remapped and idt_install_irqs()
* installs the IRQ gates; then they land in irq_dispatch(), which
* sends the PIC EOI and calls the per-IRQ handler (if any).
* Interrupts stay disabled throughout (IF=0); exceptions still fire.
* IRQs only fire after the integrator enables them with `sti`.
*/
#ifndef NADIR_IDT_H
@ -17,6 +20,10 @@
/* Number of CPU exception vectors this base installs (0-31). */
#define IDT_EXCEPTION_COUNT 32
/* First remapped IRQ vector (IRQ 0 -> vector 32) and IRQ line count. */
#define IDT_IRQ_BASE 32
#define IDT_IRQ_COUNT 16
/* Stack layout on entry to exception_handler().
*
* Built by the CPU (RIP/CS/RFLAGS, plus an error code on vectors
@ -63,4 +70,22 @@ void idt_init(void);
* frame above. Prints vector/error/RIP and halts; never returns. */
void exception_handler(struct interrupt_frame *frame);
/* C entry point for vectors 32-47, called from irq_common with the
* same frame layout (vector = 32 + irq, error = 0 dummy). Runs at
* Ring 0 with IF cleared; sends the PIC EOI and calls the handler
* registered for that IRQ, if any. Spurious vectors outside 32-47
* are ignored. */
void irq_dispatch(struct interrupt_frame *frame);
/* Register `handler` for IRQ line `irq` (0-15); NULL unregisters.
* Preconditions: Ring 0, `irq` < 16 (out-of-range calls ignored).
* Failure modes: none; takes effect on the next IRQ after return. */
void irq_register_handler(uint8_t irq, void (*handler)(void));
/* Install the 16 IRQ gates (vectors 32-47 -> irq stubs) with selector
* 0x18 and flags 0x8E (present, DPL 0, 64-bit interrupt gate).
* Preconditions: Ring 0, idt_init() already ran, PIC already remapped
* via pic_remap(). Leaves IF cleared. Failure modes: none. */
void idt_install_irqs(void);
#endif /* NADIR_IDT_H */