The launcher implements a very simple function in the center of the screen; print a line of strings (assembler +c+red hat Linux implementation)

Programming: Start the program to implement a very simple function in the center of the screen; print a line of strings (assembler +c+red hat Linux implementation)

assembly language writing:

Boot.asm Startup program code:

; Our launcher implements very simple functions in the center of the screen

; Print a line of strings

org 07c00h; org directive explicitly tells the compiler that my program start address is 07c00h, not

; the original 00000

; int assembly directive INT 10h

MOV Ax,cs

MOV Es,ax

mov bp,msgstr; es:bp; The point is what we're going to show.

The address of the string

mov cx,12; string length

MOV dh,12; the line number displayed

MOV dl,36; display the column number

MOV bh,0; number of pages displayed

mov al,1; A string structure is displayed.

mov bl,0ch; display character attributes black-bottom Scarlet Letter

MOV ah,13h; explicitly call 13h subroutine

Msgstr:db "Hello my OSI"

int 10h

Times 210-($-$$) DB 0; Repeat n time each fill value is 0

DW 55aah

JMP $; Keep jumping to the current position is a dead loop. Note: $ is the current address.

Assembly Run Environment Legend:

650) this.width=650; the "alt=" launcher implements a very simple function in the center of the screen; print a line of strings (assembler +c+red Hat Linux implementation)-the writer-WELCOME MY BLOG. "Src=" Http://img2.ph.1 26.net/rv3nselsmle8chwrehmk3g==/3245125006597545695.jpg "style=" border:0px;margin:0px 10px 0px 0px; "/>

Virtual machine System: Write C code implementation under Red Hat Linux running environment:

Load the compiled BOOT.ASM launcher into the virtual machine and write the C language code in the virtual machine to implement the Boot.bin 512B launcher copy.

#include <stdio.h>

#include <fcnt1.h>

#include <sys/types.h>

#include <sys/stat.h>

int main (int argc,char *argv[])

{

int Fd_source;

int fd_dest;

int read_count = 0;

Char buffer[512]={0};

Fd_source=open ("Boot.bin", 0_rdonly);

if (fd_source<0)

{

Perror ("Open Boot.bin Error:");

return 0;

}

Fd_dest=ope ("virtual_floppy.vfd", 0_rwonly);

while ((Read_count=read (fd_source,buffer,512)) >0)

{

Write (Fd_dest,buffer,read_count);

memset (buffer,0,512);

}

printf ("Write Image ok!");

return 0;

}

Operating Procedure legend:

First step: Load the blank boot image that we wrote in the assembly.

Next, we're going to enter this command to write the C language code

650) this.width=650; the "alt=" launcher implements a very simple function in the center of the screen; print a line of strings (assembler +c+red Hat Linux implementation)-the writer-WELCOME MY BLOG. "Src=" H Ttp://img1.ph.126.net/docnlneut_hf_jp7_hnefa==/303148550017726501.jpg "style=" border:0px;margin:0px 10px 0px 0px; " />

Step Two: We have the C language Foundation, then we start to copy the 512B boot.bin start-up program.

650) this.width=650; the "alt=" launcher implements a very simple function in the center of the screen; print a line of strings (assembler +c+red Hat Linux implementation)-the writer-WELCOME MY BLOG. "Src=" Http://img0.ph.1 26.net/qtfhfjwryafwnbebdibqvg==/4805622277481413032.jpg "style=" border:0px;margin:0px 10px 0px 0px; "/>

Step three: Well, we've already written boot.bin.

650) this.width=650; the "alt=" launcher implements a very simple function in the center of the screen; print a line of strings (assembler +c+red Hat Linux implementation)-the writer-WELCOME MY BLOG. "Src=" Http://img2.ph.1 26.net/is7gw5ssf3bs9p0jqhy_-w==/705939241690819370.jpg "style=" border:0px;margin:0px 10px 0px 0px; "/>

650) this.width=650; the "alt=" launcher implements a very simple function in the center of the screen; print a line of strings (assembler +c+red Hat Linux implementation)-the writer-WELCOME MY BLOG. "Src=" Http://img0.ph.1 26.net/prd5g_8k_osz5m3jfv5xsq==/4854880398405824049.jpg "style=" border:0px;margin:0px 10px 0px 0px; "/>

Use WinImage to start the program we have written.

650) this.width=650; the "alt=" launcher implements a very simple function in the center of the screen; print a line of strings (assembler +c+red Hat Linux implementation)-the writer-WELCOME MY BLOG. "Src=" Http://img0.ph.1 26.net/cgyubwqrxzygwhz-ieyz6q==/6597961470588608232.jpg "style=" border:0px;margin:0px 10px 0px 0px; "/>

The author notes: Just learn the assembly, please Daniel do not spray!!!

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