bootloader

I'm doing an iso file in assembly and I want to add color to the text (in this case: red). Does anyone know how to do it? [BITS 16] [ORG 0x7C00] jmp main main: mov si, string ; si=string call printstr jmp $ printstr: lodsb ; al=&si[0] cmp al,0 ;FLAGS = 0 jnz print ret print: mov ah,0Eh int 10h jmp printstr string db "HELLO WORLD!",13,10,0 times 510 - ($-$$) db 0 dw 0xAA55 As a preliminary advice, always setup the segment registers that your bootloader depends on. Here, because of lodsb together with [ORG 0x7C00] , you must set DS=0 . Best also make sure the direction flag DF is in a known

I'd like to load a shared library (closed-source binary user-space library) at boot stage with grub boot-loader. Are there any chances for this or I must write a custom-elf-loader (grub module) to do it? 29/08/2014: For more detail, this is a programming problem in which I want to customize or add some new features to Grub boot-loader project. Thank you for your all supporting! So, you don't make it crystal clear what you are trying to do, but: Loading a userspace (assuming Linux SysV ELF type) shared library straight into GRUB is not possible. GRUB modules are indeed in ELF format, but they

I’m currently working with an Arduino Due board which has an Atmel SAM3X8E processor embedded. I’m programming it using the Atmel Studio (version 7.0.1645) and the provided Atmel Software Framework (version 3.28.1). The purpose of the program running on the SAM is to gain reprogramming functionality. Therefore the program gets the image from a host PC, flashes it block by block in the unused flash bank and verifies the image. All that is working fine, but I’m running into the same issue as this post ( Atmel SAM3X dual bank switching not working ). The Atmel SAM3X8E has two 256-kByte flash

I'm having a lot of trouble expressing my questions properly when I'm trying to ask other questions on this topic, so what is the proper name for a program running directly on the machine in question? A term that could describe both a kernel, and a bootloader in the sense that they are being executed directly without an operating system? The C standard calls that a "free standing environment", which strikes me as about as good a term to use as most others I've seen. I would just use the term "standalone" because that's essentially what it's doing. Standing alone, without the benefit of an

There are a lot of question on stackoverflow with the similar title. I read all of them, but none of them answers my problem. This is why I opened this question. I am creating an operating system in assembler and C. I found that I must compile C code to binary format, extract text section and save it as a file, then convert it to ISO, then mount it to virtual optical dive of diskete and then load my OS in VirtualBox. So, that is a lot of work I want to avoid. I don't want to convert my binary file to ISO every time. So, I decided to put the binary machine code of my OS to virtual hard drive (

For educational purposes, I have adapted this bootloader from mikeos.berlios.de/write-your-own-os.html rewriting it to specifically load at address 0x7c00. The final code is this: [BITS 16] ; Tells nasm to build 16 bits code [ORG 0x7C00] ; The address the code will start start: mov ax, 0 ; Reserves 4Kbytes after the bootloader add ax, 288 ; (4096 + 512)/ 16 bytes per paragraph mov ss, ax mov sp, 4096 mov ax, 0 ; Sets the data segment mov ds, ax mov si, texto ; Sets the text position call imprime ; Calls the printing routine jmp $ ; Infinite loop texto db 'It works! :-D', 0 imprime: ; Prints