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Rev 8866 Rev 8869
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;; Copyright (C) KolibriOS team 2004-2021. All rights reserved. ;;
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;; Copyright (C) KolibriOS team 2004-2021. All rights reserved. ;;
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;; Copyright (C) MenuetOS 2000-2004 Ville Mikael Turjanmaa      ;;
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;; Copyright (C) MenuetOS 2000-2004 Ville Mikael Turjanmaa      ;;
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;; Distributed under terms of the GNU General Public License    ;;
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;; Distributed under terms of the GNU General Public License    ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 8866 $
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$Revision: 8869 $
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align 4
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align 4
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do_change_task:
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do_change_task:
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;param:
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;param:
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;   ebx = address of the APPDATA for incoming task (new)
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;   ebx = address of the APPDATA for incoming task (new)
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;warning:
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;warning:
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;   [CURRENT_TASK] and [TASK_BASE] must be changed before (e.g. in find_next_task)
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;   [current_slot_idx] and [TASK_BASE] must be changed before (e.g. in find_next_task)
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;   [current_slot] is the outcoming (old), and set here to a new value (ebx)
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;   [current_slot] is the outcoming (old), and set here to a new value (ebx)
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;scratched: eax,ecx,esi
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;scratched: eax,ecx,esi
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        mov     esi, ebx
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        mov     esi, ebx
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        xchg    esi, [current_slot]
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        xchg    esi, [current_slot]
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; set new stack after saving old
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; set new stack after saving old
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        jnc     .no_xsave
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        jnc     .no_xsave
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        mov     ecx, [esi+APPDATA.fpu_state]
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        mov     ecx, [esi+APPDATA.fpu_state]
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        mov     eax, [xsave_eax]
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        mov     eax, [xsave_eax]
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        mov     edx, [xsave_edx]
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        mov     edx, [xsave_edx]
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        xsave   [ecx]
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        xsave   [ecx]
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        mov     ecx, [CURRENT_TASK]
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        mov     ecx, [current_slot_idx]
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        mov     [fpu_owner], ecx
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        mov     [fpu_owner], ecx
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        mov     ecx, [current_slot]
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        mov     ecx, [current_slot]
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        mov     ecx, [ecx+APPDATA.fpu_state]
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        mov     ecx, [ecx+APPDATA.fpu_state]
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        xrstor  [ecx]
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        xrstor  [ecx]
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  .no_xsave:
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  .no_xsave:
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;retval:
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;retval:
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;   ebx = address of the APPDATA for the selected task (slot-base)
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;   ebx = address of the APPDATA for the selected task (slot-base)
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;   edi = address of the TASKDATA for the selected task
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;   edi = address of the TASKDATA for the selected task
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;   ZF  = 1  if the task is the same
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;   ZF  = 1  if the task is the same
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;warning:
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;warning:
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;   [CURRENT_TASK] = bh , [TASK_BASE] = edi -- as result
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;   [current_slot_idx] = bh , [TASK_BASE] = edi -- as result
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;   [current_slot] is not set to new value (ebx)!!!
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;   [current_slot] is not set to new value (ebx)!!!
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;scratched: eax,ecx
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;scratched: eax,ecx
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proc find_next_task
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proc find_next_task
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        call    update_counters
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        call    update_counters
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        spin_lock_irqsave SchedulerLock
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        spin_lock_irqsave SchedulerLock
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        jz      .priority_next
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        jz      .priority_next
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.task_loop:
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.task_loop:
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        mov     ebx, [ebx+APPDATA.in_schedule.next]
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        mov     ebx, [ebx+APPDATA.in_schedule.next]
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        mov     edi, ebx
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        mov     edi, ebx
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        shr     edi, 3
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        shr     edi, 3
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        add     edi, CURRENT_TASK - (SLOT_BASE shr 3)
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        add     edi, TASK_TABLE - (SLOT_BASE shr 3)
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        mov     al, [edi+TASKDATA.state]
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        mov     al, [edi+TASKDATA.state]
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        test    al, al
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        test    al, al
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        jz      .task_found     ; state == 0
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        jz      .task_found     ; state == 0
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        cmp     al, 5
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        cmp     al, 5
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        jne     .task_next      ; state == 1,2,3,4,9
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        jne     .task_next      ; state == 1,2,3,4,9
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        pop     ecx
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        pop     ecx
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        spin_unlock_irqrestore SchedulerLock
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        spin_unlock_irqrestore SchedulerLock
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.found:
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.found:
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        ; the line below assumes APPDATA is 256 bytes long and SLOT_BASE is
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        ; the line below assumes APPDATA is 256 bytes long and SLOT_BASE is
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        ; aligned on 0x10000
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        ; aligned on 0x10000
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        mov     [CURRENT_TASK], bh
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        mov     byte [current_slot_idx], bh
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        mov     [TASK_BASE], edi
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        mov     [TASK_BASE], edi
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        rdtsc   ;call  _rdtsc
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        rdtsc   ;call  _rdtsc
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        mov     [edi+TASKDATA.counter_add], eax; for next using update_counters
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        mov     [edi+TASKDATA.counter_add], eax; for next using update_counters
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        cmp     ebx, [current_slot]
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        cmp     ebx, [current_slot]
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        ret
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        ret