不结束应用程序

20_day/bootpack.h

@@ -30,6 +30,7 @@ void asm_inthandler27(void);
 void asm_inthandler2c(void);
 unsigned int memtest_sub(unsigned int start, unsigned int end);
 void farjmp(int eip, int cs);
+void farcall(int eip, int cs);
 void asm_cons_putchar(void);
 
 /* fifo.c */

20_day/console.c

@@ -256,7 +256,7 @@ void cmd_hlt(struct CONSOLE *cons, int *fat)
 		p = (char *) memman_alloc_4k(memman, finfo->size);
 		file_loadfile(finfo->clustno, finfo->size, p, fat, (char *) (ADR_DISKIMG + 0x003e00));
 		set_segmdesc(gdt + 1003, finfo->size - 1, (int) p, AR_CODE32_ER);
-		farjmp(0, 1003 * 8);
+		farcall(0, 1003 * 8);
 		memman_free_4k(memman, (int) p, finfo->size);
 	} else {
 		/*没有找到文件的情况*/

20_day/hlt.nas

@@ -1,6 +1,12 @@
 [BITS 32]
-		MOV		AL,'A'
-		CALL	2*8:0xbe3
-fin:
-		HLT
-		JMP		fin
+		MOV		AL,'h'
+		CALL    2*8:0xbe8
+		MOV		AL,'e'
+		CALL    2*8:0xbe8
+		MOV		AL,'l'
+		CALL    2*8:0xbe8
+		MOV		AL,'l'
+		CALL    2*8:0xbe8
+		MOV		AL,'o'
+		CALL    2*8:0xbe8
+		RETF

20_day/naskfunc.nas

@@ -16,7 +16,7 @@
 		GLOBAL	_asm_inthandler20, _asm_inthandler21
 		GLOBAL	_asm_inthandler27, _asm_inthandler2c
 		GLOBAL	_memtest_sub
-		GLOBAL	_farjmp
+		GLOBAL	_farjmp, _farcall
 		GLOBAL	_asm_cons_putchar
 		EXTERN	_inthandler20, _inthandler21
 		EXTERN	_inthandler27, _inthandler2c
@@ -213,6 +213,10 @@ _farjmp:		; void farjmp(int eip, int cs);
 		JMP    FAR [ESP+4]    ; eip, cs
 		RET
 
+_farcall:		; void farcall(int eip, int cs);
+		CALL		FAR [ESP+4]     ; eip, cs
+		RET
+
 _asm_cons_putchar:
 		PUSH		1
 		AND			EAX,0xff ; 将AH和EAX的高位置0，将EAX置为已存入字符编码的状态