; =============================================================================
; Модуль      : IRQ Handler
; Назначение  : Обработчик прерываний VMMDev
; Файл        : core/irq.inc
; =============================================================================

align 4
vbox_irq_count      dd 0

; vbox_irq_handler — Top-half обработчик IRQ
proc vbox_irq_handler stdcall
    push ebx edx

    movzx edx, word [vbox_device.port]
    add dx, VMMDEV_PORT_OFF_REQUEST_FAST
    in eax, dx

    test eax, eax
    jz .not_ours

    mov ebx, eax

    ; ACK все события сразу
    out dx, eax

    DEBUGF __DEBUG_IRQ__, "[VBoxGuest] [Dispatch] [IRQ] events=0x%x, service event=0x%x\n", ebx, [dispatcher_active_events]

    ; Немедленно разбудить HGCM-треды (Linux: wake_up() из IRQ)
    test ebx, VMMDEV_EVENT_HGCM
    jz .no_hgcm_wake
    call hgcm_irq_dispatch
.no_hgcm_wake:

    ; Вызвать fn_on_event у всех подходящих сервисов прямо сейчас
    stdcall dispatcher_dispatch, ebx

    lock inc dword [vbox_irq_count]

.acked:
    pop edx ebx
    mov eax, 1
    ret

.not_ours:
    pop edx ebx
    xor eax, eax
    ret
endp

; hgcm_irq_dispatch — Разбудить все HGCM-треды из IRQ контекста
proc hgcm_irq_dispatch
    push eax ebx ecx edx esi edi

    mov ecx, [services_count]
    test ecx, ecx
    jz .done

    mov edi, services_table

.loop:
    cmp dword [edi + SERVICE_ENTRY.enabled], 0
    je .next

    cmp dword [edi + SERVICE_ENTRY.hgcm_wakeup_event], 0
    je .next

    mov eax, [edi + SERVICE_ENTRY.hgcm_wakeup_event]
    mov ebx, [edi + SERVICE_ENTRY.hgcm_wakeup_event_id]
    xor edx, edx
    xor esi, esi
    invoke RaiseEvent

.next:
    add edi, sizeof.SERVICE_ENTRY
    dec ecx
    jnz .loop

.done:
    pop edi esi edx ecx ebx eax
    ret
endp

; vmmdev_irq_install — Установить обработчик IRQ
proc vmmdev_irq_install
    mov eax, [vbox_device.irq]
    test eax, eax
    jz .no_irq

    DEBUGF 2, "[VBoxGuest] [IRQ] Attaching to IRQ %d\n", eax

    invoke AttachIntHandler, eax, vbox_irq_handler, 0
    test eax, eax
    jz .failed

    DEBUGF 2, "[VBoxGuest] [IRQ] Handler attached successfully\n"
    xor eax, eax
    ret

.no_irq:
    DEBUGF 2, "[VBoxGuest] [IRQ] No IRQ line\n"
    mov eax, VERR_GENERAL_FAILURE
    ret

.failed:
    DEBUGF 2, "[VBoxGuest] [IRQ] Attach failed\n"
    mov eax, VERR_INTERNAL_ERROR
    ret
endp