当心寄存器

20_day/Makefile

@@ -46,10 +46,10 @@ bootpack.bim : $(OBJS_BOOTPACK) Makefile
 bootpack.hrb : bootpack.bim Makefile
 	$(BIM2HRB) bootpack.bim bootpack.hrb 0
 
-hlt.hrb : hlt.nas Makefile
-	$(NASK) hlt.nas hlt.hrb hlt.lst
+hello.hrb : hello.nas Makefile
+	$(NASK) hello.nas hello.hrb hello.lst
 
-haribote.sys : asmhead.bin bootpack.hrb hlt.hrb Makefile
+haribote.sys : asmhead.bin bootpack.hrb hello.hrb Makefile
 	copy /B asmhead.bin+bootpack.hrb haribote.sys
 
 haribote.img : ipl10.bin haribote.sys Makefile
@@ -58,7 +58,7 @@ haribote.img : ipl10.bin haribote.sys Makefile
 		copy from:haribote.sys to:@: \
 		copy from:ipl10.nas to:@: \
 		copy from:make.bat to:@: \
-		copy from:hlt.hrb to:@: \
+		copy from:hello.hrb to:@: \
 		imgout:haribote.img
 
 # 其他指令

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 */
@@ -241,7 +242,7 @@ void cmd_mem(struct CONSOLE *cons, unsigned int memtotal);
 void cmd_cls(struct CONSOLE *cons);
 void cmd_dir(struct CONSOLE *cons);
 void cmd_type(struct CONSOLE *cons, int *fat, char *cmdline);
-void cmd_hlt(struct CONSOLE *cons, int *fat);
+int cmd_app(struct CONSOLE *cons, int *fat, char *cmdline);
 
 /* file.c */
 struct FILEINFO {

20_day/console.c

@@ -157,13 +157,13 @@ void cons_runcmd(char *cmdline, struct CONSOLE *cons, int *fat, unsigned int mem
 		cmd_dir(cons);
 	} else if (strncmp(cmdline, "type ", 5) == 0) {
 		cmd_type(cons, fat, cmdline);
-	} else if (strcmp(cmdline, "hlt") == 0) {
-		cmd_hlt(cons, fat);
 	} else if (cmdline[0] != 0) {
-		/*不是命令，也不是空行*/
-		putfonts8_asc_sht(cons->sht, 8, cons->cur_y, COL8_FFFFFF, COL8_000000, "Bad command.", 12);
-		cons_newline(cons);
-		cons_newline(cons);
+		if (cmd_app(cons, fat, cmdline) == 0) {
+			/*不是命令，不是应用程序，也不是空行*/
+			putfonts8_asc_sht(cons->sht, 8, cons->cur_y, COL8_FFFFFF, COL8_000000, "Bad command.", 12);
+			cons_newline(cons);
+			cons_newline(cons);
+		}
 	}
 	return;
 }
@@ -245,24 +245,45 @@ void cmd_type(struct CONSOLE *cons, int *fat, char *cmdline)
 	return;
 }
 
-void cmd_hlt(struct CONSOLE *cons, int *fat)
+int cmd_app(struct CONSOLE *cons, int *fat, char *cmdline)
 {
 	struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
-	struct FILEINFO *finfo = file_search("HLT.HRB", (struct FILEINFO *) (ADR_DISKIMG + 0x002600), 224);
+	struct FILEINFO *finfo;
 	struct SEGMENT_DESCRIPTOR *gdt = (struct SEGMENT_DESCRIPTOR *) ADR_GDT;
-	char *p;
+	char name[18], *p;
+	int i;
+
+	/*根据命令行生成文件名*/
+	for (i = 0; i < 13; i++) {
+		if (cmdline[i] <= ' ') {
+			break;
+		}
+		name[i] = cmdline[i];
+	}
+	name[i] = 0; /*暂且将文件名的后面置为0*/
+
+	/*寻找文件 */
+	finfo = file_search(name, (struct FILEINFO *) (ADR_DISKIMG + 0x002600), 224);
+	if (finfo == 0 && name[i -1]!= '.') {
+		/*由于找不到文件，故在文件名后面加上“.hrb”后重新寻找*/
+		name[i ] = '.';
+		name[i + 1] = 'H';
+		name[i + 2] = 'R';
+		name[i + 3] = 'B';
+		name[i + 4] = 0;
+		finfo = file_search(name, (struct FILEINFO *) (ADR_DISKIMG + 0x002600), 224);
+	}
+
 	if (finfo != 0) {
 		/*找到文件的情况*/
 		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*/
-		putfonts8_asc_sht(cons->sht, 8, cons->cur_y, COL8_FFFFFF, COL8_000000, "File not found.", 15);
 		cons_newline(cons);
+		return 1;
 	}
-	cons_newline(cons);
-	return;
+	/*没有找到文件的情况*/
+	return 0;
 }

20_day/dsctbl.c

@@ -27,6 +27,7 @@ void init_gdtidt(void)
 	set_gatedesc(idt + 0x21, (int) asm_inthandler21, 2 * 8, AR_INTGATE32);
 	set_gatedesc(idt + 0x27, (int) asm_inthandler27, 2 * 8, AR_INTGATE32);
 	set_gatedesc(idt + 0x2c, (int) asm_inthandler2c, 2 * 8, AR_INTGATE32);
+	set_gatedesc(idt + 0x40, (int) asm_cons_putchar, 2 * 8, AR_INTGATE32);
 
 	return;
 }

20_day/hello.nas

@@ -0,0 +1,14 @@
+[INSTRSET "i486p"]
+[BITS 32]
+		MOV		ECX,msg
+putloop:
+		MOV		AL,[CS:ECX]
+		CMP		AL,0
+		JE		fin
+		INT		0x40
+		ADD		ECX,1
+		JMP		putloop
+fin:
+	RETF
+msg:
+		DB		"hello",0

20_day/hlt.nas

@@ -1,6 +0,0 @@
-[BITS 32]
-		MOV		AL,'A'
-		CALL	2*8:0xbe3
-fin:
-		HLT
-		JMP		fin

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
@@ -213,11 +213,18 @@ _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:
+		STI
+		PUSHAD
 		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
 		PUSH    EAX
 		PUSH		DWORD [0x0fec] ; 读取内存并PUSH该值
 		CALL		_cons_putchar
 		ADD			ESP,12   ; 将栈中的数据丢弃
-		RETF
+		POPAD
+		IRETD