I just finished up a very bare-bones bootloader for my OS and now I'm trying to switch to protected mode and jump to the kernel. The kernel exists on the second sector (right after the bootloader)...

I would like to ask if it is GRUB that switch the CPU to protected mode during boot up or is it the Linux kernel that does it. And also I would like to ask - is the kernel itself (vmlinuz) an ELF o...

I'm trying to initialize protected mode with exception handling on an AMD 286 system. I've debugged the code below on Bochs, and it works fine there. So does it when run on a Pentium 4 machine. But...

I learned to switch to protected mode with a simple DOS based bootloader. This loader loads kernel.bin into a buffer and copies the buffer to 100000h (kernel is 8KiB). Control is then transferred t...

I learned x86-16 assembly and i want to learn to x86-32 assembly. I maked a simple 32-bit program but this code not work When program makes a far jump console displays 'JMP illegal descriptor 0' I ...

Many of our users are reporting that they are getting a blank page when using IE11 to access our website. Sometimes they don't even get a blank page, the browser just stays on the last page visited...

I am building an 32 bit OS in assembly. I have setup the IDT and I am handling program interruptus through int instruction. How can I enable the syscall and sysenter instructions and how do I hand...

I am currently studying low level organization of operating systems. In order to achive that I am trying to understand how Linux kernel is loaded. A thing that I cannot comprehend is the transitio...

I'm working on keyboard input for a very basic kernel that I'm developing and I'm completely stuck. I can't seem to find any information online that can show me the information I need to know. My ...

I have a Windows Service that runs a Team City Build agent on a Windows 7 OS. This agent triggers NUnit tests which use the Selenium IE web drivers to execute a series of tests. For the Selenium ...

I am trying to understand how a machine goes from power on to running a kernel. From what I've gathered, it is useful to switch into protected mode during boot up in order to gain access to more ad...

I'm working on an operating system project, using isolinux (syslinux 4.5) as bootloader, loading my kernel with multiboot header organised at 0x200000. As I know the kernel is already in 32-bit pr...

At school we have been using a bootstrap program to run stand-alone programs without an operating system. I have been studying this program and when protected mode is enabled there is a far jump ex...

I'm reading intel software developer manual (section 3.1). Here is said that The IA-32 architecture supports three basic operating modes: protected mode, real-address mode, and system managemen...

I know the difference between a real mode and protected mode from the OS and hardware perspective. But I am trying to figure out What does a program 'knows' about real mode or protected mode? how...

In my Silverlight application I'm using regular SaveFileDialog for prompt user to save some file. The problem is that on some Windows 7 computers, if user use IE in protected mode, and try to save...

I am doing some OS experiment. Until now, all my code utilized the real mode BIOS interrupt to manipulate hard disk and floppy. But once my code enabled the Protect Mode of the CPU, all the real mo...

I am writing an IE Extension (BHO) in C#. When run in protected mode (IE's new UAC-compliant mode which forces all extensions to run at low-integrity), it fails because it cannot access user.config...

I'm having difficulties understanding how a simple boot loader works. The boot loader I'm talking about is the one from MITs course "Operating Systems Engineering". First, let me show you a piece...

I am currently playing around with x86 Assember in order to sharpen my low-level programming skills. Currently, I am facing a little problem with the addressing scheme in 32-Bit Protected Mode. Th...

I am building an IE Extension, and I need to keep my Access Database file in the Appdata folder. It's working fine. But in many systems where IE IE Protected Mode is ON, it crashes, I guess this is...

I have an Internet Explorer add-in, written in C#, which talks via a WCF named-pipe to a .NET desktop application. The desktop app creates the ServiceHost for the netNamedPipeBinding, and each inst...

I thought that one process cannot read the memory of other processes. But I'm shocked to see an application named "WinHex" which has "RAM Editor" and it is able to access the en...