kolibrios/kernel/branches/Kolibri-acpi/core/irq.inc

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;;                                                              ;;
;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License    ;;
;;                                                              ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

IRQ_RESERVED   equ 24

IRQ_POOL_SIZE  equ 48

uglobal

align 16
irqh_tab            rd sizeof.LHEAD * IRQ_RESERVED / 4

irqh_pool           rd sizeof.IRQH * IRQ_POOL_SIZE /4
next_irqh           rd 1

irq_active_set      rd 1
irq_failed          rd IRQ_RESERVED

endg

align 4
init_irqs:

    mov ecx, IRQ_RESERVED
    mov edi, irqh_tab
@@:
    mov eax, edi
    stosd
    stosd
    loop @B

    mov ecx, IRQ_POOL_SIZE-1
        mov     eax, irqh_pool+sizeof.IRQH
    mov [next_irqh], irqh_pool
@@:
        mov     [eax-sizeof.IRQH], eax
        add     eax, sizeof.IRQH
    loop @B

        mov     [eax-sizeof.IRQH], dword 0
    ret


align 4
proc attach_int_handler stdcall, irq:dword, handler:dword, user_data:dword
         locals
           .irqh dd ?
         endl

         and [.irqh], 0

         push ebx

         mov  ebx, [irq]            ;irq num
         test ebx, ebx
         jz   .err

         cmp  ebx, IRQ_RESERVED
         jae  .err

         mov  edx, [handler]
         test edx, edx
         jz   .err

        spin_lock_irqsave IrqsList

;allocate handler

         mov ecx, [next_irqh]
         test ecx, ecx
         jz .fail

         mov eax, [ecx]
         mov [next_irqh], eax
         mov [.irqh], ecx

        mov     [irq_failed+ebx*4], 0;clear counter

         mov eax, [user_data]
         mov [ecx+IRQH.handler], edx
         mov [ecx+IRQH.data],    eax
        and     [ecx+IRQH.num_ints], 0

         lea edx, [irqh_tab+ebx*8]
         list_add_tail ecx, edx     ;clobber eax
         stdcall enable_irq, ebx

.fail:
        spin_unlock_irqrestore IrqsList
.err:
         pop ebx
         mov eax, [.irqh]
         ret

endp

if 0
align 4
proc get_int_handler stdcall, irq:dword

        mov eax, [irq]
        cmp eax, 15
        ja .fail
        mov eax, [irq_tab + 4 * eax]
        ret
.fail:
        xor eax, eax
        ret
endp
end if


align 4
proc  detach_int_handler

       ret
endp


macro irq_serv_h [num] {
    forward
align 4
  .irq_#num :
    push num
       jmp .main
}

align 16
irq_serv:

; .irq_1:
;      push 1
;      jmp .main
; etc...

irq_serv_h 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15
irq_serv_h 16, 17, 18, 19, 20, 21, 22, 23

purge irq_serv_h

align 16
.main:
       save_ring3_context

       mov   ebp, [esp + 32]
        mov     bx, app_data;os_data
       mov   ds, bx
       mov   es, bx

       cmp   [v86_irqhooks+ebp*8], 0
       jnz   v86_irq

       cmp   bp, 6
       jnz   @f
       push  ebp
       call  [fdc_irq_func]
       pop   ebp
@@:

       cmp   bp, 14
       jnz   @f
       push  ebp
       call  [irq14_func]
       pop   ebp
@@:
       cmp   bp, 15
       jnz   @f
       push  ebp
       call  [irq15_func]
       pop   ebp
@@:
       bts [irq_active_set], ebp

       lea esi, [irqh_tab+ebp*8]        ; esi= list head
       mov ebx, esi
.next:
        mov     ebx, [ebx+IRQH.list.next]; ebx= irqh pointer
       cmp ebx, esi
       je .done

       push ebx                         ; FIX THIS
       push edi
       push esi

       push [ebx+IRQH.data]
       call [ebx+IRQH.handler]
        pop     ecx

       pop esi
       pop edi
       pop ebx

       test eax, eax
       jz .next

        inc     [ebx+IRQH.num_ints]
       btr [irq_active_set], ebp
       jmp .next

.done:
       btr [irq_active_set], ebp
       jnc .exit

; There is at least one configuration with one device which generates IRQ
; that is not the same as it should be according to PCI config space.
; For that device, the handler is registered at wrong IRQ.
; As a workaround, when nobody acknowledges the generated IRQ,
; try to ask all other registered handlers; if some handler acknowledges
; the IRQ this time, relink it to the current IRQ list.
; To make this more reliable, for every handler keep number of times
; that it has acknowledged an IRQ, and assume that handlers with at least one
; acknowledged IRQ are registered properly.
; Note: this still isn't 100% correct, because two IRQs can fire simultaneously,
; the better way would be to find the correct IRQ, but I don't know how to do
; this in that case.
; Also, [fdc_irq_func], [irq14_func], [irq15_func] could process interrupt
; but do not return whether they did it, so just ignore IRQs 6, 14, 15.
        cmp     ebp, 6
        jz      .fail
        cmp     ebp, 14
        jz      .fail
        cmp     ebp, 15
        jz      .fail
        push    ebp
        xor     ebp, ebp
.try_other_irqs:
        cmp     ebp, [esp]
        jz      .try_next_irq
        cmp     ebp, 1
        jz      .try_next_irq
        cmp     ebp, 12
        jz      .try_next_irq
        lea     esi, [irqh_tab+ebp*8]
        mov     ebx, esi
.try_next_handler:
        mov     ebx, [ebx+IRQH.list.next]
        cmp     ebx, esi
        je      .try_next_irq
        cmp     [ebx+IRQH.num_ints], 0
        jne     .try_next_handler
; keyboard handler acknowledges everything
        push    [ebx+IRQH.data]
        call    [ebx+IRQH.handler]
        pop     ecx
        test    eax, eax
        jz      .try_next_handler

.found_in_wrong_list:
        DEBUGF 1,'K : warning: relinking handler from IRQ%d to IRQ%d\n',\
                ebp, [esp]
        pop     ebp
        spin_lock_irqsave IrqsList
        list_del ebx
        lea     edx, [irqh_tab+ebp*8]
        list_add_tail ebx, edx
        spin_unlock_irqrestore IrqsList
        jmp     .exit

.try_next_irq:
        inc     ebp
        cmp     ebp, 16
        jb      .try_other_irqs
        pop     ebp

.fail:
       inc [irq_failed+ebp*4]
.exit:

       mov ecx, ebp
       call irq_eoi

       restore_ring3_context
       add   esp, 4
       iret

align 4
irqD:
        push  eax
        push  ecx
        xor     eax, eax
        out     0xf0, al
        mov   cl, 13
        call  irq_eoi
        pop   ecx
        pop   eax
        iret