sol_system.inc

一个用纯汇编 写的操作系统 源代码 是用 TASM 编译器写的

	mov	ecx,[memory_end]
	sub	ecx,edi
	cmp	ecx,4000h

	jbe	buffer_for_variable_ok
	mov	ecx,4000h
  
    buffer_for_variable_ok:
	;push	ecx
	;push	edi
	;push	esi
	;call	[GetEnvironmentVariable]
	
	; there are NO environment variables in SOL
	mov	eax,0
	
	add	edi,eax
	cmp	edi,[memory_end]
	jae	out_of_memory
	ret




open:
	;push	0
	;push	0
	;push	OPEN_EXISTING
	;push	0
	;push	FILE_SHARE_READ
	;push	GENERIC_READ
	;push	edx
	;call	[CreateFile]
	;cmp	eax,-1
	;je	file_error

	;-------------------------------
	; works ok in SOL ;)
	;-------------------------------
	invoke	API_File_Open, edx
	
	cmp	eax,-1
	je	file_error

	
	mov	ebx,eax
	clc
	ret

    file_error:
	stc
	ret
	
	
	
	
create:
	;push	0
	;push	0
	;push	CREATE_ALWAYS
	;push	0
	;push	FILE_SHARE_READ
	;push	GENERIC_WRITE
	;push	edx
	;call	[CreateFile]
	;cmp	eax,-1
	;je	file_error

	;mov	ebx,eax
	;clc
	;ret
	
	;push	edx
	;Call	[API_File_Open]
	
	;cmp	eax,-1
	;je	file_error

	mov	eax,[fasm_write_fhandle]
	mov	ebx,eax
	clc
	ret

	
write:
	;push	0			; overlaped
	;push	bytes_count		; bytes_wr_ptr
	;push	ecx			; nr_of_bytes to write
	;push	edx			; buffer_ptr
	;push	ebx			; file_handle
	;call	[WriteFile]
	;or	eax,eax
	;jz	file_error

	;-------------------------------------------
	; write is simulated in a memory buffer
	;-------------------------------------------
	
	pushad
		mov	esi,edx
		mov	edi,[fasm_write_mem_ptr]
		add	edi,[fasm_write_fpos]
		add	[fasm_write_fpos],ecx
		mov	[bytes_count],ecx
		
		rep	movsb
	popad

	clc
	ret
	
read:
	;mov	ebp,ecx

	;push	0			; lpoverlapped
	;push	bytes_count		; bytes read ptr
	;push	ecx			; bytes_to_read
	;push	edx			; lpBuff
	;push	ebx			; hFile
	;call	[ReadFile]
	;or	eax,eax
	;jz	file_error
	;cmp	ebp,[bytes_count]
	;jne	file_error

;	push	0			; callback_ptr
;	push	0			; read_flags
;	push	edx			; dest_buff_ptr
;	push	ecx			; read_size
;	push	ebx			; file_handle
;	Call	[API_File_Read]

	;-------------------------------------------
	; surprise:
	; this read is really performed in SOL ;)
	;-------------------------------------------
	invoke	API_File_Read, ebx,ecx,edx,0,0
	cmp	eax,-1
	je	file_error

	; no error
	clc
	ret
	
close:
;	push	ebx
;	call	[CloseHandle]

	cmp	ebx,[fasm_write_fhandle]
	jz	.close_done
	;-------------------------------------------
	; surprise: this works in SOL ;)
	;-------------------------------------------
	invoke	API_File_Close,ebx

.close_done:	
	mov	eax,1
	ret
	
lseek:
	movzx	eax,al
;	push	eax			; move method: 2 = FILE_END
;	push	0			; distance to move high
;	push	edx			; distance to move low
;	push	ebx			; file_handle
;	call	[SetFilePointer]

	;--------------------------------------------------------------------
	; FASM does use lseek from file end in order to get file size ;)
	;--------------------------------------------------------------------
	cmp	eax,2			; 2 = FILE_END in windows
	jz	.is_file_end

	; normal seek is dummy
	; because SOL does not yet have a lseek API :D
	mov	eax,edx
	ret
	
.is_file_end:
	cmp	edx,0
	jz	.is_get_fsize
	
	; WARN: another unhandled situation
	xor	eax,eax
	ret
	
.is_get_fsize:

	invoke	API_File_Get_Size,ebx
		
	ret		



;display_string:
;	push	esi
;	push	STD_OUTPUT_HANDLE
;	call	[GetStdHandle]
;	mov	ebp,eax
;	pop	esi
;	mov	edi,esi
;	or	ecx,-1
;	xor	al,al
;	repne	scasb
;	neg	ecx
;	sub	ecx,2
;	push	0
;	push	bytes_count
;	push	ecx
;	push	esi
;	push	ebp
;	call	[WriteFile]
;	ret

display_string:
	push	edi
	push	ecx
	
	mov	edi,esi
	xor	ecx,ecx
	
.len_loop:
	mov	al,[edi]
	test	al,al
	jz	.wr_string
	
	inc	ecx
	inc	edi
	jmp	.len_loop
	
	
.wr_string:
	test	ecx,ecx
	jz	.done	
	js	.done
	
	call	write_stdout

.done:
	pop	ecx
	pop	edi

	ret

display_string2:
	push	0				; no_cli
	push	esi				; string_ptr
	push	0				; wnd_handle
	Call	[API_Debug_Out_String]

	ret	



display_character:
	push	ebx
	push	edi
	mov	[character],dl


;	push	0				; no_cli
;	push	sol_character			; string_ptr
;	push	0				; wnd_handle
;	Call	[API_Debug_Out_String]

	mov	edi,[fasm_stdout_mem_ptr]
	add	edi,[fasm_stdout_size]
	inc	[fasm_stdout_size]
	mov	[edi],dl
	
;	push	STD_OUTPUT_HANDLE
;	call	[GetStdHandle]
;	mov	ebx,eax
;	push	0
;	push	bytes_count
;	push	1
;	push	character
;	push	ebx
;	call	[WriteFile]

	pop	edi
	pop	ebx
	ret
	
	
display_number:
	push	ebx
	mov	ecx,1000000000
	xor	edx,edx
	xor	bl,bl
      display_loop:
	div	ecx
	push	edx
	cmp	ecx,1
	je	display_digit
	or	bl,bl
	jnz	display_digit
	or	al,al
	jz	digit_ok
	not	bl
      display_digit:
	mov	dl,al
	add	dl,30h
	push	ecx
	call	display_character
	pop	ecx
      digit_ok:
	mov	eax,ecx
	xor	edx,edx
	mov	ecx,10
	div	ecx
	mov	ecx,eax
	pop	eax
	or	ecx,ecx
	jnz	display_loop
	pop	ebx
	ret

display_user_messages:
	mov	[displayed_count],0

	call	flush_display_buffer
	
	cmp	[displayed_count],1
	jb	line_break_ok
	je	make_line_break

	mov	ax,word [last_displayed]
	cmp	ax,0A0Dh
	je	line_break_ok

	cmp	ax,0D0Ah
	je	line_break_ok

      make_line_break:
	mov	word [buffer],0A0Dh

;	push	STD_OUTPUT_HANDLE
;	call	[GetStdHandle]
;	push	0
;	push	bytes_count
;	push	2
;	push	buffer
;	push	eax
;	call	[WriteFile]

	push	edi
	
	mov	edi,[fasm_stdout_mem_ptr]
	add	edi,[fasm_stdout_size]
	add	[fasm_stdout_size],2
	mov	word [edi],0A0Dh

	pop	edi

      line_break_ok:
	ret


display_block:
	add	[displayed_count],ecx
	cmp	ecx,1
	ja	take_last_two_characters
	jb	block_displayed
	
	mov	al,[last_displayed+1]
	mov	ah,[esi]
	mov	word [last_displayed],ax
	jmp	block_ok
	
      take_last_two_characters:
	mov	ax,[esi+ecx-2]
	mov	word [last_displayed],ax

      block_ok:
	push	ecx

;	push	STD_OUTPUT_HANDLE
;	call	[GetStdHandle]

	pop	ecx

;	push	0
;	push	bytes_count
;	push	ecx
;	push	esi
;	push	eax
;	call	[WriteFile]

	;----------------------------------------------------------
	; does not work corectly because of lseek issues on SOL
	;----------------------------------------------------------
	;call	write_stdout

      block_displayed:
	ret

fatal_error:
	mov	esi,error_prefix
	call	display_string
	pop	esi
	call	display_string
	mov	esi,error_suffix
	call	display_string
	
	mov	al,0FFh
	jmp	exit_program
	
assembler_error:
	call	display_user_messages
	push	dword 0
	mov	ebx,[current_line]
      get_error_lines:
	push	ebx
	test	byte [ebx+7],80h
	jz	display_error_line
	mov	edx,ebx
      find_definition_origin:
	mov	edx,[edx+12]
	test	byte [edx+7],80h
	jnz	find_definition_origin
	push	edx
	mov	ebx,[ebx+8]
	jmp	get_error_lines
      display_error_line:
	mov	esi,[ebx]
	call	display_string
	mov	esi,line_number_start
	call	display_string
	mov	eax,[ebx+4]
	and	eax,7FFFFFFFh
	call	display_number
	mov	dl,']'
	call	display_character
	pop	esi
	cmp	ebx,esi
	je	line_number_ok
	mov	dl,20h
	call	display_character
	push	esi
	mov	esi,[esi]
	movzx	ecx,byte [esi]
	inc	esi
	call	display_block
	mov	esi,line_number_start
	call	display_string
	pop	esi
	mov	eax,[esi+4]
	and	eax,7FFFFFFFh
	call	display_number
	mov	dl,']'
	call	display_character
      line_number_ok:
	mov	esi,line_data_start
	call	display_string
	mov	esi,ebx
	mov	edx,[esi]
	call	open
	mov	al,2
	xor	edx,edx
	call	lseek
	mov	edx,[esi+8]
	sub	eax,edx
	push	eax
	
	xor	al,al
	call	lseek

	mov	ecx,[esp]
	mov	edx,[additional_memory]
	lea	eax,[edx+ecx]
	cmp	eax,[additional_memory_end]
	ja	out_of_memory

	call	read
	call	close
	
	pop	ecx
	mov	esi,[additional_memory]
      get_line_data:
	mov	al,[esi]
	cmp	al,0Ah
	je	display_line_data
	cmp	al,0Dh
	je	display_line_data
	cmp	al,1Ah
	je	display_line_data
	or	al,al
	jz	display_line_data
	inc	esi
	loop	get_line_data
      display_line_data:
	mov	ecx,esi
	mov	esi,[additional_memory]
	sub	ecx,esi
	call	display_block
	mov	esi,cr_lf
	call	display_string
	pop	ebx
	or	ebx,ebx
	jnz	display_error_line
	mov	esi,error_prefix
	call	display_string
	pop	esi
	call	display_string
	mov	esi,error_suffix
	call	display_string
	mov	al,2
	jmp	exit_program

make_timestamp:
;	push	buffer
;	call	[GetSystemTime]

;	movzx	ecx,word [buffer]
;	mov	eax,ecx
;	sub	eax,1970
;	mov	ebx,365
;	mul	ebx
;	mov	ebp,eax
;	mov	eax,ecx
;	sub	eax,1969
;	shr	eax,2
;	add	ebp,eax
;	mov	eax,ecx
;	sub	eax,1901
;	mov	ebx,100
;	div	ebx
;	sub	ebp,eax
;	mov	eax,ecx
;	xor	edx,edx
;	sub	eax,1601
;	mov	ebx,400
;	div	ebx
;	add	ebp,eax
;	movzx	ecx,word [buffer+2]
;	mov	eax,ecx
;	dec	eax
;	mov	ebx,30
;	mul	ebx
;	add	ebp,eax
;	cmp	ecx,8
;	jbe	months_correction
;	mov	eax,ecx
;	sub	eax,7
;	shr	eax,1
;	add	ebp,eax
;	mov	ecx,8
;      months_correction:
;	mov	eax,ecx
;	shr	eax,1
;	add	ebp,eax
;	cmp	ecx,2
;	jbe	day_correction_ok
;	sub	ebp,2
;	movzx	ecx,word [buffer]
;	test	ecx,11b
;	jnz	day_correction_ok
;	xor	edx,edx
;	mov	eax,ecx
;	mov	ebx,100
;	div	ebx
;	or	edx,edx
;	jnz	day_correction
;	mov	eax,ecx
;	mov	ebx,400
;	div	ebx
;	or	edx,edx
;	jnz	day_correction_ok
;     day_correction:
;	inc	ebp
;     day_correction_ok:
;	movzx	eax,word [buffer+6]
;	dec	eax
;	add	eax,ebp
;	mov	ebx,24
;	mul	ebx
;	movzx	ecx,word [buffer+8]
;	add	eax,ecx
;	mov	ebx,60
;	mul	ebx
;	movzx	ecx,word [buffer+10]
;	add	eax,ecx
;	mov	ebx,60
;	mul	ebx
;	movzx	ecx,word [buffer+12]
;	add	eax,ecx
;
	mov	eax,111234567
	ret

character db ?
bytes_count dd ?
displayed_count dd ?
last_displayed rb 2

error_prefix db 'error: ',0
error_suffix db '.'
cr_lf db 0Dh,0Ah,0
line_number_start db ' [',0
line_data_start db ':',0Dh,0Ah,0