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Rev 11 Rev 14
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label  next_usage_update   dword   at  0xB008
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label  timer_ticks         dword   at  0xFDF0
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; IRQ0 HANDLER (TIMER INTERRUPT) ;;
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;; IRQ0 HANDLER (TIMER INTERRUPT) ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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        mov   [edi+0x18],eax
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        mov   [edi+0x18],eax
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        shl   ebx, 3
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        shl   ebx, 3
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        xor   eax, eax
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        xor   eax, eax
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        add   ebx, tss0
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        add   ebx, tss0
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        mov   word  [0xB004], bx   ; selector
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        mov   word  [far_jump.sel],  bx   ; selector
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        mov   dword [0xB000], eax  ; offset
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        mov   dword [far_jump.offs], eax  ; offset
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        mov   al,0x20   ; send End Of Interrupt signal
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        mov   al,0x20   ; send End Of Interrupt signal
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        mov   dx,0x20
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        mov   dx,0x20
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        out   dx,al
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        out   dx,al
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        cmp   [0xffff],byte 0
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        cmp   [0xffff],byte 0
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        je    .switch
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        je    .switch
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        dec   byte [0xffff]
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        dec   byte [0xffff]
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        jz    @f
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        jz    @f
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     .switch:
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     .switch:
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        jmp   pword [0xB000]
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        jmp   pword [far_jump]
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        inc   [context_counter] ;noname & halyavin
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        inc   [context_counter] ;noname & halyavin
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       @@:
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       @@:
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        pop   es ds
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        pop   es ds
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        popad
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        iret
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        popad
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uglobal
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        iret
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   far_jump:
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    .offs dd ?
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    .sel  dw ?