Subversion Repositories Kolibri OS

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;;                                                              ;;

;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;

;; Copyright (C) MenuetOS 2000-2004 Ville Mikael Turjanmaa      ;;

;; Distributed under terms of the GNU General Public License    ;;

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$Revision: 3539 $

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;; IRQ0 HANDLER (TIMER INTERRUPT) ;;

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align 32

irq0:

        pushad

        Mov     ds, ax, app_data

        mov     es, ax

        inc     [timer_ticks]

        mov     eax, [timer_ticks]

        call    playNote       ; <<<--- Speaker driver

        sub     eax, [next_usage_update]

        cmp     eax, 100

        jb      .nocounter

        add     [next_usage_update], 100

        call    updatecputimes

  .nocounter:

        xor     ecx, ecx        ; send End Of Interrupt signal

        call    irq_eoi

;        btr     dword[DONT_SWITCH], 0

;        jc      .return

        call    find_next_task

        jz      .return  ; if there is only one running process

        call    do_change_task

  .return:

        popad

        iretd

align 4

change_task:

        pushfd

        cli

        pushad

if 0

; \begin{Mario79} ; <- must be refractoried, if used...

        cmp     [dma_task_switched], 1

        jne     .find_next_task

        mov     [dma_task_switched], 0

        mov     ebx, [dma_process]

        cmp     [CURRENT_TASK], ebx

        je      .return

        mov     edi, [dma_slot_ptr]

        mov     [CURRENT_TASK], ebx

        mov     [TASK_BASE], edi

        jmp     @f

.find_next_task:

; \end{Mario79}

end if

        call    find_next_task

        jz      .return  ; the same task -> skip switch

  @@:

;        mov     byte[DONT_SWITCH], 1

        call    do_change_task

  .return:

        popad

        popfd

        ret

uglobal

align 4

;  far_jump:

;   .offs dd ?

;   .sel  dw ?

   context_counter     dd 0 ;noname & halyavin

   next_usage_update   dd 0

   timer_ticks         dd 0

;  prev_slot           dd ?

;  event_sched         dd ?

endg

align 4

update_counters:

        mov     edi, [TASK_BASE]

        rdtsc

        sub     eax, [edi+TASKDATA.counter_add] ; time stamp counter add

        add     [edi+TASKDATA.counter_sum], eax ; counter sum

        ret

align 4

updatecputimes:

        mov     ecx, [TASK_COUNT]

        mov     edi, TASK_DATA

  .newupdate:

        xor     eax, eax

        xchg    eax, [edi+TASKDATA.counter_sum]

        mov     [edi+TASKDATA.cpu_usage], eax

        add     edi, 0x20

        loop    .newupdate

        ret

;TODO: Надо бы убрать использование do_change_task из V86...

; и после этого перенести обработку TASKDATA.counter_add/sum в do_change_task

align 4

do_change_task:

;param:

;   ebx = address of the APPDATA for incoming task (new)

;warning:

;   [CURRENT_TASK] and [TASK_BASE] must be changed before (e.g. in find_next_task)

;   [current_slot] is the outcoming (old), and set here to a new value (ebx)

;scratched: eax,ecx,esi

        mov     esi, ebx

        xchg    esi, [current_slot]

; set new stack after saving old

        mov     [esi+APPDATA.saved_esp], esp

        mov     esp, [ebx+APPDATA.saved_esp]

; set new thread io-map

        Mov     dword [page_tabs+((tss._io_map_0 and -4096) shr 10)],eax,[ebx+APPDATA.io_map]

        Mov     dword [page_tabs+((tss._io_map_1 and -4096) shr 10)],eax,[ebx+APPDATA.io_map+4]

; set new thread memory-map

        mov     ecx, APPDATA.dir_table

        mov     eax, [ebx+ecx]      ;offset>0x7F

        cmp     eax, [esi+ecx]      ;offset>0x7F

        je      @f

        mov     cr3, eax

@@:

; set tss.esp0

        Mov     [tss._esp0],eax,[ebx+APPDATA.saved_esp0]

        mov     edx, [ebx+APPDATA.tls_base]

        cmp     edx, [esi+APPDATA.tls_base]

        je      @f

        mov     [tls_data_l+2], dx

        shr     edx, 16

        mov     [tls_data_l+4], dl

        mov     [tls_data_l+7], dh

        mov     dx, app_tls

        mov     fs, dx

@@:

; set gs selector unconditionally

        Mov     gs,ax,graph_data

      ; set CR0.TS

        cmp     bh, byte[fpu_owner] ;bh == incoming task (new)

        clts                        ;clear a task switch flag

        je      @f

        mov     eax, cr0            ;and set it again if the owner

        or      eax, CR0_TS         ;of a fpu has changed

        mov     cr0, eax

  @@: ; set context_counter (only for user pleasure ???)

        inc     [context_counter]   ;noname & halyavin

      ; set debug-registers, if it's necessary

        test    byte[ebx+APPDATA.dbg_state], 1

        jz      @f

        xor     eax, eax

        mov     dr6, eax

        lea     esi, [ebx+ecx+APPDATA.dbg_regs-APPDATA.dir_table];offset>0x7F

        cld

  macro lodsReg [reg] {

        lodsd

        mov     reg, eax

  }     lodsReg dr0, dr1, dr2, dr3, dr7

  purge lodsReg

  @@:

        ret

;end.

struct  MUTEX_WAITER

        list    LHEAD

        task    dd ?

ends

;void  __fastcall mutex_init(struct mutex *lock)

align 4

mutex_init:

        mov     [ecx+MUTEX.lhead.next], ecx

        mov     [ecx+MUTEX.lhead.prev], ecx

        mov     [ecx+MUTEX.count], 1

        ret

;void  __fastcall mutex_lock(struct mutex *lock)

align 4

mutex_lock:

        dec     [ecx+MUTEX.count]

        jns     .done

        pushfd

        cli

        sub     esp, sizeof.MUTEX_WAITER

        list_add_tail esp, ecx      ;esp= new waiter, ecx= list head

        mov     edx, [TASK_BASE]

        mov     [esp+MUTEX_WAITER.task], edx

.forever:

        mov     eax, -1

        xchg    eax, [ecx+MUTEX.count]

        dec     eax

        jz      @F

        mov     [edx+TASKDATA.state], 1

        call    change_task

        jmp     .forever

@@:

        mov     edx, [esp+MUTEX_WAITER.list.next]

        mov     eax, [esp+MUTEX_WAITER.list.prev]

        mov     [eax+MUTEX_WAITER.list.next], edx

        mov     [edx+MUTEX_WAITER.list.prev], eax

        cmp     [ecx+MUTEX.lhead.next], ecx

        jne     @F

        mov     [ecx+MUTEX.count], 0

@@:

        add     esp, sizeof.MUTEX_WAITER

        popfd

.done:

        ret

;void  __fastcall mutex_unlock(struct mutex *lock)

align 4

mutex_unlock:

        pushfd

        cli

        mov     eax, [ecx+MUTEX.lhead.next]

        cmp     eax, ecx

        mov     [ecx+MUTEX.count], 1

        je      @F

        mov     eax, [eax+MUTEX_WAITER.task]

        mov     [eax+TASKDATA.state], 0

@@:

        popfd

        ret

purge MUTEX_WAITER