Subversion Repositories Kolibri OS

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;;                                                              ;;

;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;;

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

;;                                                              ;;

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

$Revision: 888 $

GREEDY_KERNEL  equ 0

struc APP_HEADER_00

{ .banner      dq ?

  .version     dd ?    ;+8

  .start       dd ?    ;+12

  .i_end       dd ?    ;+16

  .mem_size    dd ?    ;+20

  .i_param     dd ?    ;+24

}

struc APP_HEADER_01

{ .banner      dq ?

  .version     dd ?    ;+8

  .start       dd ?    ;+12

  .i_end       dd ?    ;+16

  .mem_size    dd ?    ;+20

  .stack_top   dd ?    ;+24

  .i_param     dd ?    ;+28

  .i_icon      dd ?    ;+32

}

struc APP_PARAMS

{ .app_cmdline	 ;0x00

  .app_path	 ;0x04

  .app_eip	 ;0x08

  .app_esp	 ;0x0C

  .app_mem	 ;0x10

}

macro _clear_ op

{  mov ecx, op/4

   xor eax, eax

   cld

   rep stosd

}

fs_execute_from_sysdir:

	xor	ebx, ebx

	xor	edx, edx

	mov	esi, sysdir_path

align 4

proc fs_execute

;fn_read:dword, file_size:dword, cluster:dword

; ebx - cmdline

; edx - flags

; ebp - full filename

; [esp+4] = procedure DoRead, [esp+8] = filesize & [esp+12]... - arguments for it

           locals

             cmdline       rd 64    ;256/4

             filename      rd 256   ;1024/4

             flags     dd ?

             save_cr3      dd ?

             slot      dd ?

             slot_base     dd ?

             file_base     dd ?

             file_size     dd ?

                          ;app header data

             hdr_cmdline   dd ? ;0x00

             hdr_path      dd ? ;0x04

             hdr_eip       dd ? ;0x08

             hdr_esp       dd ? ;0x0C

             hdr_mem       dd ? ;0x10

             hdr_i_end     dd ? ;0x14

           endl

           pushad

           mov [flags], edx

; [ebp]  pointer to filename

           lea edi, [filename]

           lea ecx, [edi+1024]

           mov al, '/'

           stosb

@@:

           cmp edi, ecx

           jae .bigfilename

           lodsb

           stosb

           test al, al

           jnz @b

           mov esi, [ebp]

           test esi, esi

           jz .namecopied

           mov byte [edi-1], '/'

@@:

           cmp edi, ecx

           jae .bigfilename

           lodsb

           stosb

           test al, al

           jnz @b

           jmp .namecopied

.bigfilename:

           popad

           mov eax, -ERROR_FILE_NOT_FOUND

           ret

.namecopied:

           mov [cmdline], ebx

           test ebx, ebx

           jz @F

           lea eax, [cmdline]

           mov dword [eax+252], 0

           stdcall strncpy, eax, ebx, 255

@@:

           lea eax, [filename]

           stdcall load_file, eax

           mov  ecx, -ERROR_FILE_NOT_FOUND

           test eax, eax

           jz .err_file

           mov [file_base], eax

           mov [file_size], ebx

           lea ebx, [hdr_cmdline]

           call test_app_header

           mov ecx, -0x1F

           test eax, eax

           jz .err_hdr

           DEBUGF 1,"%s",new_process_loading

.wait_lock:

           cmp [application_table_status],0

           je .get_lock

           call   change_task

           jmp .wait_lock

.get_lock:

           mov eax, 1

           xchg eax, [application_table_status]

           cmp eax, 0

           jne .wait_lock

           call set_application_table_status

           call get_new_process_place

           test eax, eax

           mov ecx, -0x20      ; too many processes

           jz .err

           mov [slot], eax

           shl eax, 8

           add eax, SLOT_BASE

           mov [slot_base], eax

           mov edi, eax

           _clear_ 256     ;clean extended information about process

; write application name

           lea eax, [filename]

           stdcall strrchr,  eax, '/'  ; now eax points to name without path

           lea esi, [eax+1]

           test eax, eax

           jnz @F

           lea esi, [filename]

@@:

           mov ecx, 8  ; 8 chars for name

           mov edi, [slot_base]

.copy_process_name_loop:

           lodsb

           cmp al, '.'

           jz .copy_process_name_done

           test al, al

           jz .copy_process_name_done

           stosb

           loop .copy_process_name_loop

.copy_process_name_done:

           mov ebx, cr3

           mov [save_cr3], ebx

           stdcall create_app_space,[hdr_mem],[file_base],[file_size]

           mov ecx, -30  ; no memory

           test eax, eax

           jz .failed

           mov   ebx,[slot_base]

           mov   [ebx+APPDATA.dir_table],eax

           mov   eax,[hdr_mem]

           mov   [ebx+APPDATA.mem_size],eax

           mov ecx, [hdr_mem]

           mov edi, [file_size]

           add edi, 4095

           and edi, not 4095

           sub ecx, edi

           jna @F

           xor eax, eax

               cld

           rep stosb

@@:

           mov ecx, [file_base]

           call @mem_free@4

           lea eax, [hdr_cmdline]

           lea ebx, [cmdline]

           lea ecx, [filename]

           stdcall set_app_params ,[slot],eax,ebx,ecx,[flags]

           mov eax, [save_cr3]

           call set_cr3

           xor ebx, ebx

           mov [application_table_status],ebx ;unlock application_table_status mutex

           mov eax,[process_number]  ;set result

           ret

.failed:

           mov eax, [save_cr3]

           call set_cr3

.err:

.err_hdr:

           mov ecx, [file_base]

           call @mem_free@4

.err_file:

           xor eax, eax

           mov [application_table_status],eax

           mov eax, ecx

           ret

endp

align 4

test_app_header:

	   virtual at eax

	     APP_HEADER_00 APP_HEADER_00

	   end virtual

	   virtual at eax

	     APP_HEADER_01 APP_HEADER_01

	   end virtual

	   cmp dword [eax], 'MENU'

	   jne .fail

	   cmp word [eax+4],'ET'

	   jne .fail

	   cmp [eax+6], word '00'

	   jne	.check_01_header

	   mov	ecx,[APP_HEADER_00.start]

	   mov	[ebx+0x08], ecx 	       ;app_eip

	   mov	edx,[APP_HEADER_00.mem_size]

	   mov	[ebx+0x10], edx 	       ;app_mem

	   shr	edx,1

	   sub	edx,0x10

	   mov	[ebx+0x0C], edx 	       ;app_esp

	   mov	ecx,[APP_HEADER_00.i_param]

	   mov	[ebx], ecx		       ;app_cmdline

	   mov	[ebx+4], dword 0	       ;app_path

	   mov	edx, [APP_HEADER_00.i_end]

	   mov	[ebx+0x14], edx

	   ret

 .check_01_header:

	   cmp	[eax+6],word '01'

	   jne	.fail

	   mov	ecx,[APP_HEADER_01.start]

	   mov	[ebx+0x08], ecx 	       ;app_eip

	   mov	edx,[APP_HEADER_01.mem_size]

; \begin{diamond}[20.08.2006]

; sanity check (functions 19,58 load app_i_end bytes and that must

; fit in allocated memory to prevent kernel faults)

	   cmp	edx,[APP_HEADER_01.i_end]

	   jb	.fail

; \end{diamond}[20.08.2006]

	   mov	[ebx+0x10], edx 	       ;app_mem

	   mov	ecx,[APP_HEADER_01.stack_top]

	   mov	[ebx+0x0C], ecx 	       ;app_esp

	   mov	edx,[APP_HEADER_01.i_param]

	   mov	[ebx], edx		       ;app_cmdline

	   mov	ecx,[APP_HEADER_01.i_icon]

	   mov	[ebx+4], ecx		       ;app_path

	   mov	edx, [APP_HEADER_01.i_end]

	   mov	[ebx+0x14], edx

	   ret

.fail:

	   xor eax, eax

	   ret

align 4

proc get_new_process_place

;input:

;  none

;result:

;  eax=[new_process_place]<>0 - ok

;      0 - failed.

;This function find least empty slot.

;It doesn't increase [TASK_COUNT]!

	   mov	  eax,CURRENT_TASK

	   mov	  ebx,[TASK_COUNT]

	   inc	  ebx

	   shl	  ebx,5

	   add	  ebx,eax		;ebx - address of process information for (last+1) slot

.newprocessplace:

;eax = address of process information for current slot

	   cmp	  eax,ebx

	   jz	  .endnewprocessplace	;empty slot after high boundary

	   add	  eax,0x20

	   cmp	  word [eax+0xa],9	;check process state, 9 means that process slot is empty

	   jnz	  .newprocessplace

.endnewprocessplace:

	   mov	  ebx,eax

	   sub	  eax,CURRENT_TASK

	   shr	  eax,5 		;calculate slot index

	   cmp	  eax,256

	   jge	  .failed		;it should be <256

	   mov	  word [ebx+0xa],9	;set process state to 9 (for slot after hight boundary)

	   ret

.failed:

	   xor	  eax,eax

	   ret

endp

align 4

proc create_app_space stdcall, app_size:dword,img_base:dword,img_size:dword

           locals

             app_pages   dd ?

             img_pages   dd ?

             dir_addr    dd ?

             app_tabs    dd ?

           endl

           mov ebx, pg_data.pg_mutex

           call wait_mutex   ;ebx

           xor eax, eax

           mov [dir_addr], eax

           mov eax, [app_size]

           add eax, 4095

           and eax, not 4095

           mov [app_size], eax

           mov ebx, eax

           shr eax, 12

           mov [app_pages], eax

           add ebx, 0x3FFFFF

           and ebx, not 0x3FFFFF

           shr ebx, 22

           mov [app_tabs], ebx

           mov ecx, [img_size]

           add ecx, 4095

           and ecx, not 4095

           mov [img_size], ecx

           shr ecx, 12

           mov [img_pages], ecx

           call _alloc_page

           test eax, eax

           mov [dir_addr], eax

           jz .fail

           ;lea edi, [eax + OS_BASE]

           ;mov ecx, (OS_BASE shr 20)/4

           ;xor eax, eax

           ;cld

           ;rep stosd

           ;mov ecx, 1024-(OS_BASE shr 20)/4

           ;mov esi, _sys_pdbr+(OS_BASE shr 20)

           ;rep movsd

           lea edi, [eax+OS_BASE]

           mov ecx, 512

           xor eax, eax

           cld

           rep stosd

           mov ecx, 512

           mov esi, _sys_pdbr+(HEAP_BASE shr 20)

           rep movsd

           mov edi, [dir_addr]

           lea eax, [edi+PG_SW]

           mov [edi+OS_BASE+(page_tabs shr 20)], eax

           mov eax, edi

           call set_cr3

           mov edx, [app_tabs]

           mov edi, master_tab

@@:

           call _alloc_page

           test eax, eax

           jz .fail

           or eax, PG_UW

           stosd

           dec edx

           jnz @B

           mov edi, page_tabs

           mov ecx, [app_tabs]

           shl ecx, 10

           xor eax, eax

           rep stosd

           mov ecx, [app_pages]

           xor ebx, ebx

.alloc:

           xor ecx, ecx

           call @core_alloc@4

           test eax, eax

           jz .fail

           stdcall map_page,ebx,eax,dword PG_UW

           add ebx, 0x1000

           dec [app_pages]

           jnz .alloc

           mov ecx, [img_size]                 ; FIXME remap md

           mov esi, [img_base]

           xor edi, edi

           rep movsb

.done:

           dec [pg_data.pg_mutex]

           mov eax, [dir_addr]

           ret

.fail:

           dec [pg_data.pg_mutex]

           cmp [dir_addr], 0

           je @f

           stdcall destroy_app_space, [dir_addr]

@@:

           xor eax, eax

           ret

endp

align 4

set_cr3:

           mov ebx, [current_slot]

           mov [ebx+APPDATA.dir_table], eax

           mov cr3, eax

           ret

align 4

proc destroy_page_table stdcall, pg_tab:dword

           push ebx

           push esi

           mov esi, [pg_tab]

           mov ebx, 1024

.free:

           mov ecx, [esi]

           test ecx, 1

           jz .next

           test ecx, 1 shl 9

           jnz .next                      ;skip shared pages

           call @core_free@4

.next:

           add esi, 4

           dec ebx

           jnz .free

           pop esi

           pop ebx

           ret

endp

align 4

proc destroy_app_space stdcall, pg_dir:dword

           mov ebx, pg_data.pg_mutex

           call wait_mutex   ;ebx

           xor   edx,edx

           mov   eax,0x2

           mov ebx, [pg_dir]

.loop:

;eax = current slot of process

           mov   ecx,eax

           shl   ecx,5

           cmp   byte [CURRENT_TASK+ecx+0xa],9  ;if process running?

           jz    @f                             ;skip empty slots

           shl   ecx,3

           cmp   [SLOT_BASE+ecx+0xB8],ebx       ;compare page directory addresses

           jnz   @f

           inc   edx                            ;thread found

@@:

           inc   eax

           cmp   eax,[TASK_COUNT]               ;exit loop if we look through all processes

           jle   .loop

;edx = number of threads

;our process is zombi so it isn't counted

           cmp   edx,1

           jg    .exit

;if there isn't threads then clear memory.

           mov eax, [pg_dir]

           and eax, -4096

           add eax, OS_BASE

           mov [tmp_task_pdir], eax

           mov esi, eax

           mov edi, (HEAP_BASE shr 20)/4

.destroy:

           mov eax, [esi]

           test eax, 1

           jz .next

           and eax, not 0xFFF

           add eax, OS_BASE

           stdcall destroy_page_table, eax

           mov ecx, [esi]

           call @core_free@4

.next:

           add esi, 4

           dec edi

           jnz .destroy

           mov ecx, [pg_dir]

           call @core_free@4

.exit:

           dec [pg_data.pg_mutex]

           ret

endp

align 4

get_pid:

           mov eax, [TASK_BASE]

           mov eax, [eax+TASKDATA.pid]

           ret

pid_to_slot:

;Input:

;  eax - pid of process

;Output:

;  eax - slot of process or 0 if process don't exists

;Search process by PID.

    push   ebx

    push   ecx

    mov    ebx,[TASK_COUNT]

    shl    ebx,5

    mov    ecx,2*32

.loop:

;ecx=offset of current process info entry

;ebx=maximum permitted offset

    cmp    byte [CURRENT_TASK+ecx+0xa],9

    jz	   .endloop		 ;skip empty slots

    cmp    [CURRENT_TASK+ecx+0x4],eax ;check PID

    jz	   .pid_found

.endloop:

    add    ecx,32

    cmp    ecx,ebx

    jle    .loop

    pop    ecx

    pop    ebx

    xor    eax,eax

    ret

.pid_found:

    shr    ecx,5

    mov    eax,ecx		 ;convert offset to index of slot

    pop    ecx

    pop    ebx

    ret

check_region:

;input:

;  ebx - start of buffer

;  ecx - size of buffer

;result:

;  eax = 1 region lays in app memory

;  eax = 0 region don't lays in app memory

     mov  eax,[CURRENT_TASK]

     jmp  check_process_region

;-----------------------------------------------------------------------------

check_process_region:

;input:

;  eax - slot

;  ebx - start of buffer

;  ecx - size of buffer

;result:

;  eax = 1 region lays in app memory

;  eax = 0 region don't lays in app memory

     test ecx,ecx

     jle  .ok

     shl  eax,5

     cmp  word [CURRENT_TASK+eax+0xa],0

     jnz  .failed

     shl  eax,3

     mov  eax,[SLOT_BASE+eax+0xb8]

     test eax,eax

     jz   .failed

     mov  eax,1

     ret

;    call MEM_Get_Linear_Address

;    push ebx

;    push ecx

;    push edx

;    mov  edx,ebx

;    and  edx,not (4096-1)

;    sub  ebx,edx

;    add  ecx,ebx

;    mov  ebx,edx

;    add  ecx,(4096-1)

;    and  ecx,not (4096-1)

;.loop:

;;eax - linear address of page directory

;;ebx - current page

;;ecx - current size

;    mov  edx,ebx

;    shr  edx,22

;    mov  edx,[eax+4*edx]

;    and  edx,not (4096-1)

;    test edx,edx

;    jz   .failed1

;    push eax

;    mov  eax,edx

;    call MEM_Get_Linear_Address

;    mov  edx,ebx

;    shr  edx,12

;    and  edx,(1024-1)

;    mov  eax,[eax+4*edx]

;    and  eax,not (4096-1)

;    test eax,eax

;    pop  eax

;    jz   .failed1

;    add  ebx,4096

;    sub  ecx,4096

;    jg   .loop

;    pop  edx

;    pop  ecx

;    pop  ebx

.ok:

    mov  eax,1

    ret

;

;.failed1:

;    pop  edx

;    pop  ecx

;    pop  ebx

.failed:

    xor  eax,eax

    ret

align 4

proc read_process_memory

;Input:

;  eax - process slot

;  ebx - buffer address

;  ecx - buffer size

;  edx - start address in other process

;Output:

;  eax - number of bytes read.

	   locals

	     slot	dd ?

	     buff	dd ?

	     r_count	dd ?

	     offset	dd ?

	     tmp_r_cnt	dd ?

	   endl

	   mov [slot], eax

	   mov [buff], ebx

	   and [r_count], 0

	   mov [tmp_r_cnt], ecx

	   mov [offset], edx

	   pushad

.read_mem:

	   mov edx, [offset]

	   mov ebx, [tmp_r_cnt]

	   mov ecx, 0x400000

	   and edx, 0x3FFFFF

	   sub ecx, edx

	   cmp ecx, ebx

	   jbe @f

	   mov ecx, ebx

@@:

	   cmp ecx, 0x8000

	   jna @F

	   mov ecx, 0x8000

@@:

	   mov eax, [slot]

	   shl	eax,8

	   mov ebx, [offset]

	   push ecx

	   stdcall map_memEx, [proc_mem_map],\

			      [SLOT_BASE+eax+0xB8],\

			      ebx, ecx

	   pop ecx

	   mov esi, [offset]

	   and esi, 0xfff

	   add esi, [proc_mem_map]

	   mov edi, [buff]

	   mov edx, ecx

	   rep movsb

	   add [r_count], edx

	   add [offset], edx

	   sub [tmp_r_cnt], edx

	   jnz .read_mem

	   popad

	   mov eax, [r_count]

	   ret

endp

align 4

proc write_process_memory

;Input:

;  eax - process slot

;  ebx - buffer address

;  ecx - buffer size

;  edx - start address in other process

;Output:

;  eax - number of bytes written

	   locals

	     slot	dd ?

	     buff	dd ?

	     w_count	dd ?

	     offset	dd ?

	     tmp_w_cnt	dd ?

	   endl

	   mov [slot], eax

	   mov [buff], ebx

	   and [w_count], 0

	   mov [tmp_w_cnt], ecx

	   mov [offset], edx

	   pushad

.read_mem:

	   mov edx, [offset]

	   mov ebx, [tmp_w_cnt]

	   mov ecx, 0x400000

	   and edx, 0x3FFFFF

	   sub ecx, edx

	   cmp ecx, ebx

	   jbe @f

	   mov ecx, ebx

@@:

	   cmp ecx, 0x8000

	   jna @F

	   mov ecx, 0x8000

@@:

	   mov eax, [slot]

	   shl	eax,8

	   mov ebx, [offset]

      ;     add ebx, new_app_base

	   push ecx

	   stdcall map_memEx, [proc_mem_map],\

			      [SLOT_BASE+eax+0xB8],\

			      ebx, ecx

	   pop ecx

	   mov edi, [offset]

	   and edi, 0xfff

	   add edi, [proc_mem_map]

	   mov esi, [buff]

	   mov edx, ecx

	   rep movsb

	   add [w_count], edx

	   add [offset], edx

	   sub [tmp_w_cnt], edx

	   jnz .read_mem

	   popad

	   mov eax, [w_count]

	   ret

endp

align 4

proc new_sys_threads

           locals

             slot      dd ?

             app_cmdline   dd ? ;0x00

             app_path      dd ? ;0x04

             app_eip       dd ? ;0x08

             app_esp       dd ? ;0x0C

             app_mem       dd ? ;0x10

           endl

           cmp eax,1

           jne .failed          ;other subfunctions

           xor  eax,eax

           mov [app_cmdline], eax

           mov [app_path], eax

           mov [app_eip], ebx

           mov [app_esp], ecx

           ;mov    esi,new_process_loading

           ;call   sys_msg_board_str

           DEBUGF 1,"%s",new_process_loading

.wait_lock:

           cmp [application_table_status],0

           je .get_lock

           call   change_task

           jmp .wait_lock

.get_lock:

           mov eax, 1

           xchg eax, [application_table_status]

           cmp eax, 0

           jne .wait_lock

           call   set_application_table_status

           call get_new_process_place

           test eax, eax

           jz .failed

           mov [slot], eax

           mov    esi,[current_slot]

           mov    ebx,esi         ;ebx=esi - pointer to extended information about current thread

           mov    edi, eax

           shl    edi,8

           add    edi,SLOT_BASE

           mov    edx,edi         ;edx=edi - pointer to extended infomation about new thread

           mov    ecx,256/4

           xor eax, eax

           cld

           rep    stosd           ;clean extended information about new thread

           mov    esi,ebx

           mov    edi,edx

           mov    ecx,11

           rep    movsb           ;copy process name

           mov eax,[ebx+APPDATA.heap_base]

           mov [edx+APPDATA.heap_base], eax

           mov ecx,[ebx+APPDATA.heap_top]

           mov [edx+APPDATA.heap_top], ecx

           mov eax,[ebx+APPDATA.mem_size]

           mov [edx+APPDATA.mem_size], eax

           mov ecx,[ebx+APPDATA.dir_table]

           mov [edx+APPDATA.dir_table],ecx  ;copy page directory

           lea eax, [app_cmdline]

           stdcall set_app_params ,[slot],eax,dword 0,\

                         dword 0,dword 0

           ;mov    esi,new_process_running

           ;call   sys_msg_board_str     ;output information about succefull startup

           DEBUGF 1,"%s",new_process_running

           mov    [application_table_status],0 ;unlock application_table_status mutex

           mov    eax,[process_number]  ;set result

           ret

.failed:

           mov    [application_table_status],0

           mov    eax,-1

           ret

endp

; param

;  ebx=mutex

align 4

wait_mutex:

           push eax

           push ebx

.do_wait:

           cmp dword [ebx],0

           je .get_lock

           call change_task

           jmp .do_wait

.get_lock:

           mov eax, 1

           xchg eax, [ebx]

           test eax, eax

           jnz .do_wait

           pop ebx

           pop eax

           ret

EFL_IF	    equ 0x0200

EFL_IOPL1   equ 0x1000

EFL_IOPL2   equ 0x2000

EFL_IOPL3   equ 0x3000

align 4

proc set_app_params stdcall,slot:dword, params:dword,\

			cmd_line:dword, app_path:dword, flags:dword

           locals

             pl0_stack dd ?

           endl

           mov ecx, 1            ;(RING0_STACK_SIZE+512) shr 12

           call @core_alloc@4

           add eax, OS_BASE

           mov [pl0_stack], eax

           lea edi, [eax+RING0_STACK_SIZE]

           mov eax, [slot]

           mov ebx, eax

           shl eax, 8

           mov [eax+SLOT_BASE+APPDATA.fpu_state], edi

           mov [eax+SLOT_BASE+APPDATA.fpu_handler], 0

           mov [eax+SLOT_BASE+APPDATA.sse_handler], 0

;set default io permission map

           mov [eax+SLOT_BASE+APPDATA.io_map],\

               (tss._io_map_0-OS_BASE+PG_MAP)

           mov [eax+SLOT_BASE+APPDATA.io_map+4],\

               (tss._io_map_1-OS_BASE+PG_MAP)

           mov esi, fpu_data

           mov ecx, 512/4

           rep movsd

           cmp    ebx,[TASK_COUNT]

           jle    .noinc

           inc    dword [TASK_COUNT]       ;update number of processes

.noinc:

           shl ebx,8

           lea edx, [ebx+SLOT_BASE+APP_EV_OFFSET]

           mov [SLOT_BASE+APPDATA.fd_ev+ebx],edx

           mov [SLOT_BASE+APPDATA.bk_ev+ebx],edx

           add edx, APP_OBJ_OFFSET-APP_EV_OFFSET

           mov [SLOT_BASE+APPDATA.fd_obj+ebx],edx

           mov [SLOT_BASE+APPDATA.bk_obj+ebx],edx

           mov ecx, [def_cursor]

           mov [SLOT_BASE+APPDATA.cursor+ebx],ecx

           mov eax, [pl0_stack]

           mov [SLOT_BASE+APPDATA.pl0_stack+ebx],eax

           add eax, RING0_STACK_SIZE

           mov [SLOT_BASE+APPDATA.saved_esp0+ebx], eax

           call _alloc_page

           add eax, OS_BASE

           mov esi,[current_slot]

           mov esi,[esi+APPDATA.cur_dir]

           mov ecx,0x1000/4

           mov edi,eax

           mov [ebx+SLOT_BASE+APPDATA.cur_dir],eax

           rep movsd

           shr ebx,3

           mov dword [CURRENT_TASK+ebx+0x10], 0

.add_command_line:

           mov edx,[params]

           mov edx,[edx]       ;app_cmdline

           test edx,edx

           jz @f           ;application doesn't need parameters

           mov     eax, edx

           add     eax, 256

           jc      @f

           cmp     eax, [SLOT_BASE+APPDATA.mem_size+ebx*8]

           ja      @f

           mov     byte [edx], 0   ;force empty string if no cmdline given

           mov     eax, [cmd_line]

           test    eax, eax

           jz      @f

           stdcall strncpy, edx, eax, 256

@@:

           mov edx,[params]

           mov edx, [edx+4]    ;app_path

           test edx,edx

           jz @F           ;application don't need path of file

           mov     eax, edx

           add     eax, 1024

           jc      @f

           cmp     eax, [SLOT_BASE+APPDATA.mem_size+ebx*8]

           ja      @f

           stdcall strncpy, edx, [app_path], 1024

@@:

           mov    ebx,[slot]

           mov    eax,ebx

           shl    ebx,5

           lea    ecx,[draw_data+ebx]  ;ecx - pointer to draw data

; set window state to 'normal' (non-minimized/maximized/rolled-up) state

           mov     [ebx+window_data+WDATA.fl_wstate], WSTATE_NORMAL

           mov     [ebx+window_data+WDATA.fl_redraw], 1

           add    ebx,CURRENT_TASK        ;ebx - pointer to information about process

           mov    [ebx+TASKDATA.wnd_number],al;set window number on screen = process slot

           mov    [ebx+TASKDATA.event_mask],dword 1+2+4 ;set default event flags (see 40 function)

           inc    dword [process_number]

           mov    eax,[process_number]

           mov    [ebx+4],eax       ;set PID

;set draw data to full screen

           mov    [ecx+0],dword 0

           mov    [ecx+4],dword 0

           mov    eax,[Screen_Max_X]

           mov    [ecx+8],eax

           mov    eax,[Screen_Max_Y]

           mov    [ecx+12],eax

           mov ebx, [pl0_stack]

           mov esi,[params]

           lea ecx, [ebx+REG_EIP]

           xor eax, eax

           mov [ebx+REG_RET], dword irq0.return

           mov [ebx+REG_EDI], eax

           mov [ebx+REG_ESI], eax

           mov [ebx+REG_EBP], eax

           mov [ebx+REG_ESP], ecx   ;ebx+REG_EIP

           mov [ebx+REG_EBX], eax

           mov [ebx+REG_EDX], eax

           mov [ebx+REG_ECX], eax

           mov [ebx+REG_EAX], eax

           mov eax, [esi+0x08]       ;app_eip

           mov [ebx+REG_EIP],  eax   ;app_entry

           mov [ebx+REG_CS], dword app_code

               mov [ebx+REG_EFLAGS], dword EFL_IOPL3+EFL_IF

           mov eax, [esi+0x0C]       ;app_esp

           mov [ebx+REG_APP_ESP], eax    ;app_stack

           mov [ebx+REG_SS], dword app_data