g_int.asm

操作系统实验教程核心技术与编程实例书中地例子代码

;程序文件：\TC\G\DOSEXE_P.ASM 清单
; base on g_page.asm
.MODEL HUGE
.386P
include \tc\g\include\g_def.asm   ; 描述符结构、常量、宏定义,清单见程序1-1
include \tc\g\include\cos_def.asm ; 描述符结构、常量、宏定义,清单见程序1-1
include \tc\g\include\tos_seg.asm ; 定义TOS堆栈段TOS_STACKSEG与TOS任务状态段TOS_TSSSEG
                                  ; 清单见程序1-2
include \tc\g\include\ps_seg.asm  ;
TOS_CODESEG SEGMENT PARA USE16    ; TOS操作系统的代码段
            ASSUME CS:TOS_CODESEG,DS:DATA,SS:TOS_STACKSEG
TOS_BEGIN:   
            COS_INIT    ; TOS任务初始处理，在包含\tc\g\include\g_def.asm文件中
            ;CALL V_SEL_SETUP       ;setup v_sel  CUT OFF
            ;***********move to 2M 
            CALL SEGS_MOV_2M ;all tos_segs(6 segs) --->2M idt_m
            CALL PGT_INIT
            COS_PAGE_INIT   ;in cos_def
            ; HAVE ENTERED PAGE_MODE

            ;setup cursor
            MOV BH,0
            MOV DX,0400H  ;4 ROW 0 COLUMN
            MOV AH,2
            INT 80H  ;=dos 10h

            MOV AX,V_TOS_DATA_SEL
            MOV DS,AX
            MOV DX,OFFSET V86_10H02
            MOV AH,9H
            INT 21H

            ;setup cursor
            MOV BH,0
            MOV DX,0500H  ;5 ROW 0 COLUMN
            MOV AH,2
            INT 80H  ;=dos 10h

            MOV AX,V_TOS_DATA_SEL
            MOV DS,AX
            MOV DX,OFFSET V86_10H09
            MOV AH,9H
            INT 21H

            ;display "CCCCCCCCCC"
            MOV BH,0
            MOV AL,43H   ; char "C"
            MOV BL,41H
            MOV CX,10    ;write 10 chars "CCCCCCCC"
            MOV AH,9
            INT 80H  ;=dos 10h

            ;MOV AX,G_VRAM_SEL
            ;MOV DS,AX
            ;MOV AL,41H  ;"A"
            ;MOV AH,41H
            ;MOV DS:1782,AX

COMEBACK_TO_TOS:             ; 21h---4ch return
            JMP PAGE_END
ERR_EXEFIL:
            MOV AH,9
            MOV CX,1100H 
            MOV DX,OFFSET ERR_EXEFILE
            INT 21H    
PAGE_END:   ;*********************     should have  next 3 lines   
            DB 0EAH
            DW OFFSET TURN_TO_REAL_MODE
            DW TOS_CODE_SEL
TURN_TO_REAL_MODE:
            MOV EAX,CR0 ;  ；关闭分页模式
            AND EAX,7FFFFFFFH
            MOV CR0,EAX
            JMP SHORT FROM_PAGE
FROM_PAGE:
            CALL TURN_TO_REAL      ;返回实模式，在\tc\g\include\tos_used.asm;中
            include \tc\g\include\tos_used.asm ;
            include \tc\g\include\COS_USED.ASM ;
            include \tc\g\include\V86_USED.ASM ;

DO_DOS21H4E PROC FAR

            RET
DO_DOS21H4E ENDP
TOS_CODELEN = $
SCHED       PROC FAR
            RET
SCHED       ENDP
TOS_CODESEG ENDS
            include \tc\g\include\COS_GDT.asm
            include \tc\g\include\COS_DATA.asm
            include \tc\g\include\COS_IDT.asm
            include \tc\g\include\v86_seg.asm

;*************************************************next DOS
CODE        SEGMENT PARA USE16 ;PUBLIC 'CODE'  ;实模式代码段

            ASSUME CS:CODE,DS:DATA,SS:STACK
MAIN        PROC FAR
START:      
            REAL_PAGE_INIT  ;in cos_def.asm 
            CALL V86_IDT_INIT  ;in V86_REAL.ASM
            ;在\tc\g\include\g_def.asm中，见程序1-1
TURN_TO_PROTECT_MODE:
            CALL GDT_INIT       ;初始化GDT表，在\tc\g\include\g_real.asm中，见程序1-2

            MOV AX,V86LDTSEG
            CALL USER_Px_LDT_INIT ;in px_ldt.asm

            cli
            TURN_TO_PROTECT_PAGE  
            ;*****进入TOS任务，在\TC\G\INCLUDE\G_DEF.ASM中，见程序1-1
REAL_MODE:  
            TO_DOS      ;回到DOS 在\TC\G\INCLUDE\G_DEF.ASM中，见程序1-1
MAIN        ENDP
            include \tc\g\include\g_real.asm
            include \tc\g\include\V86_REAL.ASM      ;见程序1-1
            include \tc\g\include\a20.asm      ;见程序1-1
            include \tc\g\include\PX_LDT.ASM      ;见程序1-1
tsrline     label byte
CODE        ENDS
            include \tc\g\include\DOS_DATA.ASM      ;见程序1-1
END START