kolibrios/kernel/trunk/core/syscall.inc

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                                            ;;
;;                   SYSTEM CALL ENTRY                        ;;
;;                                                            ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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