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kolibrios/kernel/trunk/core/sched.inc
CleverMouse bf4022be57 be more fair 
git-svn-id: svn://kolibrios.org@3617 a494cfbc-eb01-0410-851d-a64ba20cac60
2013-06-07 17:05:31 +00:00

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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 ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; 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
; btr dword[DONT_SWITCH], 0
; jc .return
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
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
mov bl, SCHEDULE_ANY_PRIORITY
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
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
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