kandi X-RAY | os-tutorial Summary
kandi X-RAY | os-tutorial Summary
How to create an OS from scratch!.
Top functions reviewed by kandi - BETA
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os-tutorial Examples and Code Snippets
Trending Discussions on os-tutorial
This is a bit of an ongoing topic, but my situation is slightly different. I'm working with this tutorial. I have a view controller, that has it's own storyboard, this view controller has table view. The view controller is this table's delegate and data source. I need to add different kinds of cells to this table, and I'm using cell view model as well for this.
ANSWERAnswered 2021-Mar-23 at 15:22
I'm trying to compile a hello world program in C using gcc
I'm using gcc 9.3.0 & ubuntu 20.04
this is my c program 'hello.c'...
ANSWERAnswered 2021-Feb-07 at 08:29
The issue was mentioned by @AnttiHaapala: By the instructions ask you to set the prefix to /usr/local/i386elfgcc - maybe you've accidentally dropped this out from the binutils config and installed binutils in /usr/bin instead
The solution was uninstalling the binutils and install it again
sudo apt-get remove binutils
sudo apt-get remove --auto-remove binutils
sudo apt install build-essential
Now the binutils version is 2.34, earlier it was 2.24
I have been trying to loosely follow this tutorial on basic kernel dev. Currently, the target architecture is i386.
The implementation of IRQs is causing me issues ; my interrupt handler reports a cascade of
Invalid Op Code exceptions whenever I try to pass registers (defined as a
struct) as an argument to a function. Here is the code for the interrupt handler which raises the exception:
ANSWERAnswered 2021-Mar-06 at 22:12
@Ross Ridge figured it out (thanks to him!). The details below are what I learned from the OSDev wiki
The Streaming SIMD Extension (SSE) expands the set of instructions recognized by the CPU with some 70 additional instructions and adds some more registers. SSE needs to be enabled before its instructions and registers can be used. The compiler generates machine code which can include SSE instructions and therefore, SSE needs to be enabled.
In the code above, the passing of
struct to the function was compiled into machine code which involved the
xmm0 register, which is part of the SSE.
The assembly code to enable SSE is given below (adapted from the OSDev wiki). I added it to my bootloader, right after entering the 32-bit protected mode and before entering the kernel. That fixed the problem!
I'm trying to run an implementation of an operating system and I get this error when I run make on the terminal, I use ubuntu 20.04.
This is the makefile:...
ANSWERAnswered 2021-Mar-04 at 20:40
You linker commands are buggy because you misplaced the
ld -o -no-PIE $@, write
ld -o $@ -no-PIE:
I am trying to compile a C program to ELF format on Windows, so I tried to do several things:
- Compiled with MinGW
gcc -Wall -c test.c -o test.o, but got no test.o as an output
- Downloaded https://github.com/nativeos/i386-elf-toolchain/releases (the 32 bit version), and compiled with
"[...]/i386-elf-gcc" -c test.c -o test.o, but I got the error
i386-elf-gcc/libexec/gcc/i386-elf/5.2.0/cc1.exe: error while loading shared libraries: ?: cannot open shared object file: No such file or directory
What I'm trying to do is to follow this tutorial here: https://github.com/cfenollosa/os-tutorial, but I'm stuck on the part of making the actual link between Assembly and C. I'm well aware of the fact that this tutorial is made for Linux, not Windows, but I just... Let's just say I'm having trouble using Linux.
I don't know what files are needed to resolve my issue, so here's:
ANSWERAnswered 2021-Jan-16 at 23:47
So, it's a little complicated, so buckle up.
First, I've used NASM and MinGW. Here's a list of my following actions:
- Assembled bootsector.asm as normal (
nasm bootsect.asm -o bootset.o)
- Assembled kernel_entry.asm with
nasm kernel_entry.asm -f elf32 -o kernel_entry.o,after
- Compiled kernel.c with
gcc -m32 -c kernel.c -o kernel.o -ffreestanding -nostdlib -nostdinc
- Linked kernel_entry.o and kernel.tmp with
ld -m i386pe -o kernel.tmp -Ttext 0x1000 kernel_entry.o kernel.o
- Transformed kernel.tmp to bin with
objcopy -O binary -j .text kernel.tmp kernel.bin
- Merged together bootsect.o and kernel.bin with
type bootsect.o kernel.bin > drive.bin
Currently, I have a layout design as following...
ANSWERAnswered 2021-Jan-07 at 16:03
Scroll in scroll always been a tricky thing to handle. My suggestions -
UITextView if it's not editable, use
Calculate height of text and make text view equal to it and disable scrolling. this way you will ultimately have only one scrollable view. Helpful link.
ANSWERAnswered 2020-Dec-05 at 06:35
For me, this doesn't seem to happen:
A Section may contain 1 header, many content items and 1 footer.
DiffableDataSource, most of the online examples, are using
enum to represent Section. For instance
ANSWERAnswered 2020-Oct-14 at 05:50
if you want to update only collectionview footer text then make it variable of
Previously, I have a pretty straightforward code, which perform delete operation for
ANSWERAnswered 2020-Oct-13 at 00:35
Currently, instead of using enum, we are using struct to represent Section.
The reason is that, we have a dynamic content footer. Using struct enables us to carry the dynamic content information for the footer.
Our initial Section class looks as following
ANSWERAnswered 2020-Sep-21 at 13:39
remove UILongPressGestureRecognizer from UICollectionView, Remove gesture comment from TabInfoSettingsItemCell class. Replace this method in TabInfoSettingsController:
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