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;;                                                            ;;

;;                   SYSTEM CALL ENTRY                        ;;

;;                                                            ;;

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uglobal

  pushed_regs rd 1

endg

align 32

i40:

      pushad

      push  ds

      mov   ax,word os_data

      mov   ds,ax

      mov   es,ax

      mov   [pushed_regs],esp

      add   dword [pushed_regs],4

      cli

      mov    eax, [0x3000]

      mov    edi, eax

      shl    edi, 8

      mov    [edi+0x80000+0xB0],eax  ; used i40 handler

      ; for syscall trace function

      call  save_registers

      mov   esi,[pushed_regs]

      ; load first 3 registers

      mov   eax,[esi+28]

      mov   ebx,[esi+16]

      mov   ecx,[esi+24]

      ; save current registers

      ; stack may be modified by a system function to return some value to caller!

      pushad

      ; load all registers from TSS of the application, in crossed order (why?)

      mov   edi,[esi+28]

      mov   eax,[esi+16]

      mov   ebx,[esi+24]

      mov   ecx,[esi+20]

      mov   edx,[esi+4]

      mov   esi,[esi+0]

      ; enable interupts  -  a task switch or an IRQ _CAN_ interrupt i40 handler

      sti

      ; eax doesn't need to be saved, but...

      push   eax

      and    edi,0xff

      call   dword [servetable+edi*4]

      pop    eax

      cli

      ; return saved and probably even changed regs

      popad

      ; modify 3 program's registers (in its TSS)

      mov   [esi+28],eax

      mov   [esi+16],ebx

      mov   [esi+24],ecx

      xor    eax, eax

      mov    edi, [0x3000]          ; no syscall interrupt in use anymore

      shl    edi, 8

      mov    [edi+0x80000+0xB0],eax

      pop     eax

      mov     ds,ax

      mov     es,ax

      popad

      iretd

align 4

save_registers:

      mov   esi, [0x3010]

      mov   eax, [esi+0x4] ; load PID

      mov   esi, [pushed_regs]

      inc   [save_syscall_count]

      mov   edi,[save_syscall_count]

      and   edi,0xF

      shl   edi,6

      add   edi,save_syscall_data+32

      mov   [edi-32],eax

      mov   ecx,32 / 4

      cld

      rep   movsd

      ret

uglobal

  save_syscall_count  dd 0x0

endg

label save_syscall_data dword at 0x5000

iglobal

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

  ;; SYSTEM FUNCTIONS TABLE ;;

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

  align 4

  servetable:

      dd sys_drawwindow          ; 0-DrawWindow

      dd syscall_setpixel        ; 1-SetPixel

      dd sys_getkey              ; 2-GetKey

      dd sys_clock               ; 3-GetTime

      dd syscall_writetext       ; 4-WriteText

      dd delay_hs                ; 5-DelayHs

      dd syscall_openramdiskfile ; 6-OpenRamdiskFile

      dd syscall_putimage        ; 7-PutImage

      dd sys_button              ; 8-DefineButton

      dd sys_cpuusage            ; 9-GetProcessInfo

      dd sys_waitforevent        ; 10-WaitForEvent

      dd sys_getevent            ; 11-CheckForEvent

      dd sys_redrawstat          ; 12-BeginDraw and EndDraw

      dd syscall_drawrect        ; 13-DrawRect

      dd syscall_getscreensize   ; 14-GetScreenSize

      dd sys_background          ; 15-bgr

      dd sys_cachetodiskette     ; 16-FlushFloppyCache

      dd sys_getbutton           ; 17-GetButton

      dd syscall_system          ; 18-Shutdown,KillApp,WindowActivate

      dd syscall_startapp        ; 19-StartApp

      dd sys_midi                ; 20-ResetMidi and OutputMidi

      dd sys_setup               ; 21-SetMidiBase,SetKeymap,SetShiftKeymap,.

      dd sys_settime             ; 22-setting date,time,clock and alarm-clock

      dd sys_wait_event_timeout  ; 23-TimeOutWaitForEvent

      dd syscall_cdaudio         ; 24-PlayCdTrack,StopCd and GetCdPlaylist

      dd sys_sb16                ; 25-SetSb16

      dd sys_getsetup            ; 26-GetMidiBase,GetKeymap,GetShiftKeymap,.

      dd sys_wss                 ; 27-SetWssMainVol and SetWssCdVol

      dd sys_sb16II              ; 28-SetSb16

      dd sys_date                ; 29-GetDate

      dd syscall_readhd          ; 30-ReadHd

      dd syscall_starthdapp      ; 31-StartHdApp

      dd syscall_delramdiskfile  ; 32-DelRamdiskFile

      dd syscall_writeramdiskfile; 33-WriteRamdiskFile

      dd read_floppy_file        ; 34-ReadFloppyDrive

      dd syscall_getpixel        ; 35-GetPixel

      dd syscall_readstring      ; 36-ReadString (not yet ready)

      dd readmousepos            ; 37-GetMousePosition_ScreenRelative,.

      dd syscall_drawline        ; 38-DrawLine

      dd sys_getbackground       ; 39-GetBackgroundSize,ReadBgrData,.

      dd set_app_param           ; 40-WantEvents

      dd syscall_getirqowner     ; 41-GetIrqOwner

      dd get_irq_data            ; 42-ReadIrqData

      dd sys_outport             ; 43-SendDeviceData

      dd sys_programirq          ; 44-ProgramIrqs

      dd reserve_free_irq        ; 45-ReserveIrq and FreeIrq

      dd syscall_reserveportarea ; 46-ReservePortArea and FreePortArea

      dd display_number          ; 47-WriteNum

      dd display_settings        ; 48-SetRedrawType and SetButtonType

      dd syscall_appints         ; 49-AppInts

      dd random_shaped_window    ; 50-Window shape & scale

      dd syscall_threads         ; 51-Threads

      dd stack_driver_stat       ; 52-Stack driver status

      dd socket                  ; 53-Socket interface

      dd user_events             ; 54-User events

      dd sound_interface         ; 55-Sound interface

      dd write_to_hd             ; 56-Write a file to hd

      dd delete_from_hd          ; 57-Delete a file from hd

      dd file_system             ; 58-Common file system interface

      dd sys_trace               ; 59-System call trace

      dd new_sys_ipc             ; 60-Inter Process Communication

      dd sys_gs                  ; 61-Direct graphics access

      dd sys_pci                 ; 62-PCI functions

      dd sys_msg_board           ; 63-System message board

      dd sys_resize_app_memory   ; 64-Resize application memory usage

      dd undefined_syscall       ; 65-UTF

      dd sys_process_def         ; 66-Process definitions - keyboard

      dd sys_window_move         ; 67-Window move or resize

      dd sys_internal_services   ; 68-Some internal services

  times 255 - ( ($-servetable) /4 )  dd undefined_syscall

      dd sys_end                 ; -1-end application

endg