Subversion Repositories Kolibri OS

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;                                                              ;;

;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;;

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

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

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

$Revision: 5593 $

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; IRQ0 HANDLER (TIMER INTERRUPT) ;;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

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

        mov     bl, SCHEDULE_ANY_PRIORITY

        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

        mov     bl, SCHEDULE_ANY_PRIORITY

        call    find_next_task

        jz      .return  ; the same task -> skip switch

        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     eax, [ebx+APPDATA.process]

        cmp     eax, [current_process]

        je      @f

        mov     [current_process], eax

        mov     eax, [eax+PROC.pdt_0_phys]

        mov     cr3, eax

@@:

; set tss.esp0

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

        mov     edx, [ebx+APPDATA.tls_base]

        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+APPDATA.dbg_regs]

        cld

  macro lodsReg [reg] {

        lodsd

        mov     reg, eax

  }     lodsReg dr0, dr1, dr2, dr3, dr7

  purge lodsReg

  @@:

        ret

;end.

MAX_PRIORITY      = 0   ; highest, used for kernel tasks

USER_PRIORITY     = 1   ; default

IDLE_PRIORITY     = 2   ; lowest, only IDLE thread goes here

NR_SCHED_QUEUES   = 3   ; MUST equal IDLE_PRIORYTY + 1

uglobal

; [scheduler_current + i*4] = zero if there are no threads with priority i,

;  pointer to APPDATA of the current thread with priority i otherwise.

align 4

scheduler_current       rd      NR_SCHED_QUEUES

endg

; Add the given thread to the given priority list for the scheduler.

; in: edx -> APPDATA, ecx = priority

proc scheduler_add_thread

; 1. Acquire the lock.

        spin_lock_irqsave SchedulerLock

; 2. Store the priority in APPDATA structure.

        mov     [edx+APPDATA.priority], ecx

; 3. There are two different cases: the given list is empty or not empty.

; In first case, go to 6. Otherwise, advance to 4.

        mov     eax, [scheduler_current+ecx*4]

        test    eax, eax

        jz      .new_list

; 4. Insert the new item immediately before the current item.

        mov     ecx, [eax+APPDATA.in_schedule.prev]

        mov     [edx+APPDATA.in_schedule.next], eax

        mov     [edx+APPDATA.in_schedule.prev], ecx

        mov     [eax+APPDATA.in_schedule.prev], edx

        mov     [ecx+APPDATA.in_schedule.next], edx

; 5. Release the lock and return.

        spin_unlock_irqrestore SchedulerLock

        ret

.new_list:

; 6. Initialize the list with one item and make it the current item.

        mov     [edx+APPDATA.in_schedule.next], edx

        mov     [edx+APPDATA.in_schedule.prev], edx

        mov     [scheduler_current+ecx*4], edx

; 7. Release the lock and return.

        spin_unlock_irqrestore SchedulerLock

        ret

endp

; Remove the given thread from the corresponding priority list for the scheduler.

; in: edx -> APPDATA

proc scheduler_remove_thread

; 1. Acquire the lock.

        spin_lock_irqsave SchedulerLock

; 2. Remove the item from the corresponding list.

        mov     eax, [edx+APPDATA.in_schedule.next]

        mov     ecx, [edx+APPDATA.in_schedule.prev]

        mov     [eax+APPDATA.in_schedule.prev], ecx

        mov     [ecx+APPDATA.in_schedule.next], eax

; 3. If the given thread is the current item in the list,

; advance the current item.

; 3a. Check whether the given thread is the current item;

; if no, skip the rest of this step.

        mov     ecx, [edx+APPDATA.priority]

        cmp     [scheduler_current+ecx*4], edx

        jnz     .return

; 3b. Set the current item to eax; step 2 has set eax = next item.

        mov     [scheduler_current+ecx*4], eax

; 3c. If there were only one item in the list, zero the current item.

        cmp     eax, edx

        jnz     .return

        mov     [scheduler_current+ecx*4], 0

.return:

; 4. Release the lock and return.

        spin_unlock_irqrestore SchedulerLock

        ret

endp

SCHEDULE_ANY_PRIORITY = 0

SCHEDULE_HIGHER_PRIORITY = 1

;info:

;   Find next task to execute

;in:

;   bl = SCHEDULE_ANY_PRIORITY:

;        consider threads with any priority

;   bl = SCHEDULE_HIGHER_PRIORITY:

;        consider only threads with strictly higher priority than the current one,

;        keep running the current thread if other ready threads have the same or lower priority

;retval:

;   ebx = address of the APPDATA for the selected task (slot-base)

;   edi = address of the TASKDATA for the selected task

;   ZF  = 1  if the task is the same

;warning:

;   [CURRENT_TASK] = bh , [TASK_BASE] = edi -- as result

;   [current_slot] is not set to new value (ebx)!!!

;scratched: eax,ecx

proc find_next_task

        call    update_counters

        spin_lock_irqsave SchedulerLock

        push    NR_SCHED_QUEUES

; If bl == SCHEDULE_ANY_PRIORITY = 0, loop over all NR_SCHED lists.

; Otherwise, loop over first [APPDATA.priority] lists.

        test    bl, bl

        jz      .start

        mov     ebx, [current_slot]

        mov     edi, [TASK_BASE]

        mov     eax, [ebx+APPDATA.priority]

        test    eax, eax

        jz      .unlock_found

        mov     [esp], eax

.start:

        xor     ecx, ecx

.priority_loop:

        mov     ebx, [scheduler_current+ecx*4]

        test    ebx, ebx

        jz      .priority_next

.task_loop:

        mov     ebx, [ebx+APPDATA.in_schedule.next]

        mov     edi, ebx

        shr     edi, 3

        add     edi, CURRENT_TASK - (SLOT_BASE shr 3)

        mov     al, [edi+TASKDATA.state]

        test    al, al

        jz      .task_found     ; state == 0

        cmp     al, 5

        jne     .task_next      ; state == 1,2,3,4,9

      ; state == 5

        pushad  ; more freedom for [APPDATA.wait_test]

        call    [ebx+APPDATA.wait_test]

        mov     [esp+28], eax

        popad

        or      eax, eax

        jnz     @f

      ; testing for timeout

        mov     eax, [timer_ticks]

        sub     eax, [ebx+APPDATA.wait_begin]

        cmp     eax, [ebx+APPDATA.wait_timeout]

        jb      .task_next

        xor     eax, eax

@@:

        mov     [ebx+APPDATA.wait_param], eax  ; retval for wait

        mov     [edi+TASKDATA.state], 0

.task_found:

        mov     [scheduler_current+ecx*4], ebx

; If we have selected a thread with higher priority

; AND rescheduling is due to IRQ,

; turn the current scheduler list one entry back,

; so the current thread will be next after high-priority thread is done.

        mov     ecx, [esp]

        cmp     ecx, NR_SCHED_QUEUES

        jz      .unlock_found

        mov     eax, [current_slot]

        mov     eax, [eax+APPDATA.in_schedule.prev]

        mov     [scheduler_current+ecx*4], eax

.unlock_found:

        pop     ecx

        spin_unlock_irqrestore SchedulerLock

.found:

        mov     [CURRENT_TASK], bh

        mov     [TASK_BASE], edi

        rdtsc   ;call  _rdtsc

        mov     [edi+TASKDATA.counter_add], eax; for next using update_counters

        cmp     ebx, [current_slot]

        ret

.task_next:

        cmp     ebx, [scheduler_current+ecx*4]

        jnz     .task_loop

.priority_next:

        inc     ecx

        cmp     ecx, [esp]

        jb      .priority_loop

        mov     ebx, [current_slot]

        mov     edi, [TASK_BASE]

        jmp     .unlock_found

endp

if 0

struc TIMER

{

  .next      dd ?

  .exp_time  dd ?

  .func      dd ?

  .arg       dd ?

}

uglobal

rdy_head   rd 16

endg

align 4

pick_task:

        xor     eax, eax

  .pick:

        mov     ebx, [rdy_head+eax*4]

        test    ebx, ebx

        jz      .next

        mov     [next_task], ebx

        test    [ebx+flags.billable]

        jz      @F

        mov     [bill_task], ebx

  @@:

        ret

  .next:

        inc     eax

        jmp     .pick

; param

;  eax= task

;

; retval

;  eax= task

;  ebx= queue

;  ecx= front if 1 or back if 0

align 4

shed:

        cmp     [eax+.tics_left], 0;signed compare

        mov     ebx, [eax+.priority]

        setg    ecx

        jg      @F

        mov     edx, [eax+.tics_quantum]

        mov     [eax+.ticks_left], edx

        cmp     ebx, (IDLE_PRIORITY-1)

        je      @F

        inc     ebx

  @@:

        ret

; param

;  eax= task

align 4

enqueue:

        call    shed;eax

        cmp     [rdy_head+ebx*4], 0

        jnz     @F

        mov     [rdy_head+ebx*4], eax

        mov     [rdy_tail+ebx*4], eax

        mov     [eax+.next_ready], 0

        jmp     .pick

  @@:

        test    ecx, ecx

        jz      .back

        mov     ecx, [rdy_head+ebx*4]

        mov     [eax+.next_ready], ecx

        mov     [rdy_head+ebx*4], eax

        jmp     .pick

  .back:

        mov     ecx, [rdy_tail+ebx*4]

        mov     [ecx+.next_ready], eax

        mov     [rdy_tail+ebx*4], eax

        mov     [eax+.next_ready], 0

  .pick:

        call    pick_proc;select next task

        ret

end if