Subversion Repositories Kolibri OS

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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

        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.

        push    ebp

        xor     ebp, ebp

.try_other_irqs:

        cmp     ebp, [esp]

        jz      .try_next_irq

        cmp     ebp, 1

        jz      .try_next_irq

        cmp     ebp, 6

        jz      .try_next_irq

        cmp     ebp, 12

        jz      .try_next_irq

        cmp     ebp, 14

        jz      .try_next_irq

        cmp     ebp, 15

        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

; IRQ handler could make some kernel thread ready; reschedule

        mov     bl, SCHEDULE_HIGHER_PRIORITY

        call    find_next_task

        jz      .return  ; if there is only one running process

        call    do_change_task

  .return:

        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