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Rev 387 Rev 420
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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- 
 
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align 32
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align 32
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irq0:
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irq0:
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        pushfd
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        save_ring3_context
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        pushad
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	mov   ax, os_data
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        mov   ax, app_data  ;
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	mov   ds, ax
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        mov   ds, ax
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        jb    .nocounter
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        jb    .nocounter
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        add   eax,100
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        add   eax,100
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        mov   [next_usage_update],eax
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        mov   [next_usage_update],eax
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        call  updatecputimes
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        call  updatecputimes
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     .nocounter:
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.nocounter:
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        cmp   [DONT_SWITCH], byte 1
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        cmp   [DONT_SWITCH], byte 1
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        jne   .change_task
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        jne   .change_task
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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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        mov   [DONT_SWITCH], byte 0
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        mov   [DONT_SWITCH], byte 0
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        popad
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        restore_ring3_context
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        popfd
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        iret
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        iretd
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        jnz   .return
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        jnz   .return
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        call  do_change_task
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        call  do_change_task
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.return:
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     .return:
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        popad
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        restore_ring3_context
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        popfd
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        iret
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        iretd
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        call  do_change_task
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        call  do_change_task
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     .return:
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.return:
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        popad
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        popad
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        popfd
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        popfd
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        ret
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        ret
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update_counters:
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update_counters:
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        mov   edi, [TASK_BASE]
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        mov   edi, [TASK_BASE]
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        mov   ebx, [edi+TASKDATA.counter_add] ; time stamp counter add
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        mov   ebx, [edi+TASKDATA.counter_add] ; time stamp counter add
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        call  _rdtsc
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        rdtsc
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        sub   eax, ebx
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        sub   eax, ebx
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        add   eax, [edi+TASKDATA.counter_sum] ; counter sum
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        add   eax, [edi+TASKDATA.counter_sum] ; counter sum
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        mov   [edi+TASKDATA.state], byte 0
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        mov   [edi+TASKDATA.state], byte 0
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      .noevents:
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.noevents:
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      .found:
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.found:
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        mov   [CURRENT_TASK],ebx
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        mov   [CURRENT_TASK],ebx
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        mov   [TASK_BASE],edi
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        mov   [TASK_BASE],edi
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        call  _rdtsc
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        rdtsc                     ;call  _rdtsc
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        mov   [edi+TASKDATA.counter_add],eax
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        mov   [edi+TASKDATA.counter_add],eax
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        mov esi, [prev_slot]
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	xor   eax, eax
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	xor   eax, eax
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        cmp   ebx, [prev_slot]
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        cmp   ebx, esi
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        sete  al
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        sete  al
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ret
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ret
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; in: ebx = TSS selector index
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;
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; param
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;  ebx = incoming task
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;  esi = outcomig task
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; in: ebx = TSS selector index
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do_change_task:
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        shl ebx, 8
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        add ebx, SLOT_BASE
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        mov [current_slot], ebx
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        shl esi, 8
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        add esi, SLOT_BASE
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        mov [esi+APPDATA.saved_esp], esp
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        mov esp, [ebx+APPDATA.saved_esp]
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do_change_task:
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        mov eax, [ebx+APPDATA.dir_table]
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        mov cr3, eax
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        shl   ebx, 3
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        xor   eax, eax
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        mov ebx, [ebx+APPDATA.pl0_stack]
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        add ebx, RING0_STACK_SIZE
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        add   ebx, tss0
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        mov [tss_data+TSS._esp0], ebx
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        mov   [far_jump.sel],  bx   ; selector
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        mov ecx, cr0
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        mov   [far_jump.offs], eax  ; offset
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        or ecx, CR0_TS   ;set task switch flag
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        mov cr0, ecx
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        jmp   pword [far_jump]
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        inc   [context_counter] ;noname & halyavin
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        ret
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;
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;        shl   ebx, 3
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;        xor   eax, eax
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;        add   ebx, tss0
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;        mov   [far_jump.sel],  bx   ; selector
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;        mov   [far_jump.offs], eax  ; offset
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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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ret
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;ret