Skip to content
BranchesTags

Repository files navigation

 -=-=-= ELEC4710 - Realtime Systems =-=-=-
-=-=-= README.TXT =-=-=-
By Colin Goudie ( 9805806 )
This operating system should be compiled on a GNU Operating System using
GCC, and the Gnu Assembler, using gmake.
Notes on the example
--------------------
user.c contains the code that can be used to varify certain features of this kernel.
We have 2 Normal priority threads (test_function and test_function2) started
from kernel.c. These ensure both semaphores and our timer is working by attempting
to enter the critical section defined between sema_wait(sema) and sema_signal(sema).
Both these threads use the same semaphore so effectly they block each other each time.
When entering the critical sections they sleep for a few hundred milliseconds.
Before test_function2 actually starts it also starts a higher priority thread. This thread
continually loops printing out its current loop count. When it passed 15,000 iterations the
thread dies.
The important thing here to note is that the scheduler avoids starvation of the lower
priority threads by not allowing the high priority task to hog the CPU all the time.
test_function also starts a realtime thread that executions for 500 iterations before dying.
This demonstrates the dynamic memory (i.e. thread creation and destruction) and also that
the realtime thread takes preference over all threads with no limit to the amount of time slicing it can receive. This kernel also supports dynamic memory via the k_malloc and k_free commands. Threads can also die by Building the Kernel
-------------------
The kernel.bin file that is created must be added to the /boot/ directory of
a grub image file or floppy disk that has grub installed on it. This is easily accomplished by following the commands below.
Get the grub_disk.img file from http://www.pro-pos.org/downloads/grub_disk.zip
Place the grub_disk.img file into a directory (/home/user/os)
Set it up for mounting (run command below from /home/user/os
$ losetup /dev/loop0	grub_disk.img
Then you can simply compile this OS with $ make
This creates a file called kernel.bin
Then run the prep script $ prep
You now have grub_disk.img that contains the bootable OS.
Run BOCH'S i386 emulator or 'dd' the img to a floppy disk.
You can also copy the grub_disk.img file to a floppy on windows by using a program such as floppy_image.exe

About

An old university project to create an x86 os

Resources

Readme
Activity

Stars

9 stars

Watchers

2 watching

Forks

7 forks
Report repository

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
GitHub - gommo/OS: An old university project to create an x86 os · GitHub
Skip to content
BranchesTags
Repository files navigation
 -=-=-= ELEC4710 - Realtime Systems =-=-=-
-=-=-= README.TXT =-=-=-
By Colin Goudie ( 9805806 )
This operating system should be compiled on a GNU Operating System using
GCC, and the Gnu Assembler, using gmake.
Notes on the example
--------------------
user.c contains the code that can be used to varify certain features of this kernel.
We have 2 Normal priority threads (test_function and test_function2) started
from kernel.c. These ensure both semaphores and our timer is working by attempting
to enter the critical section defined between sema_wait(sema) and sema_signal(sema).
Both these threads use the same semaphore so effectly they block each other each time.
When entering the critical sections they sleep for a few hundred milliseconds.
Before test_function2 actually starts it also starts a higher priority thread. This thread
continually loops printing out its current loop count. When it passed 15,000 iterations the
thread dies.
The important thing here to note is that the scheduler avoids starvation of the lower
priority threads by not allowing the high priority task to hog the CPU all the time.
test_function also starts a realtime thread that executions for 500 iterations before dying.
This demonstrates the dynamic memory (i.e. thread creation and destruction) and also that
the realtime thread takes preference over all threads with no limit to the amount of time slicing it can receive. This kernel also supports dynamic memory via the k_malloc and k_free commands. Threads can also die by Building the Kernel
-------------------
The kernel.bin file that is created must be added to the /boot/ directory of
a grub image file or floppy disk that has grub installed on it. This is easily accomplished by following the commands below.
Get the grub_disk.img file from http://www.pro-pos.org/downloads/grub_disk.zip
Place the grub_disk.img file into a directory (/home/user/os)
Set it up for mounting (run command below from /home/user/os
$ losetup /dev/loop0	grub_disk.img
Then you can simply compile this OS with $ make
This creates a file called kernel.bin
Then run the prep script $ prep
You now have grub_disk.img that contains the bootable OS.
Run BOCH'S i386 emulator or 'dd' the img to a floppy disk.
You can also copy the grub_disk.img file to a floppy on windows by using a program such as floppy_image.exe

About
An old university project to create an x86 os
Resources
Readme
Activity
Stars
9 stars
Watchers
2 watching
Forks
7 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - gommo/OS: An old university project to create an x86 os · GitHub
Skip to content
BranchesTags
Repository files navigation
 -=-=-= ELEC4710 - Realtime Systems =-=-=-
-=-=-= README.TXT =-=-=-
By Colin Goudie ( 9805806 )
This operating system should be compiled on a GNU Operating System using
GCC, and the Gnu Assembler, using gmake.
Notes on the example
--------------------
user.c contains the code that can be used to varify certain features of this kernel.
We have 2 Normal priority threads (test_function and test_function2) started
from kernel.c. These ensure both semaphores and our timer is working by attempting
to enter the critical section defined between sema_wait(sema) and sema_signal(sema).
Both these threads use the same semaphore so effectly they block each other each time.
When entering the critical sections they sleep for a few hundred milliseconds.
Before test_function2 actually starts it also starts a higher priority thread. This thread
continually loops printing out its current loop count. When it passed 15,000 iterations the
thread dies.
The important thing here to note is that the scheduler avoids starvation of the lower
priority threads by not allowing the high priority task to hog the CPU all the time.
test_function also starts a realtime thread that executions for 500 iterations before dying.
This demonstrates the dynamic memory (i.e. thread creation and destruction) and also that
the realtime thread takes preference over all threads with no limit to the amount of time slicing it can receive. This kernel also supports dynamic memory via the k_malloc and k_free commands. Threads can also die by Building the Kernel
-------------------
The kernel.bin file that is created must be added to the /boot/ directory of
a grub image file or floppy disk that has grub installed on it. This is easily accomplished by following the commands below.
Get the grub_disk.img file from http://www.pro-pos.org/downloads/grub_disk.zip
Place the grub_disk.img file into a directory (/home/user/os)
Set it up for mounting (run command below from /home/user/os
$ losetup /dev/loop0	grub_disk.img
Then you can simply compile this OS with $ make
This creates a file called kernel.bin
Then run the prep script $ prep
You now have grub_disk.img that contains the bootable OS.
Run BOCH'S i386 emulator or 'dd' the img to a floppy disk.
You can also copy the grub_disk.img file to a floppy on windows by using a program such as floppy_image.exe

About
An old university project to create an x86 os
Resources
Readme
Activity
Stars
9 stars
Watchers
2 watching
Forks
7 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - gommo/OS: An old university project to create an x86 os · GitHub
Skip to content
BranchesTags
Repository files navigation
 -=-=-= ELEC4710 - Realtime Systems =-=-=-
-=-=-= README.TXT =-=-=-
By Colin Goudie ( 9805806 )
This operating system should be compiled on a GNU Operating System using
GCC, and the Gnu Assembler, using gmake.
Notes on the example
--------------------
user.c contains the code that can be used to varify certain features of this kernel.
We have 2 Normal priority threads (test_function and test_function2) started
from kernel.c. These ensure both semaphores and our timer is working by attempting
to enter the critical section defined between sema_wait(sema) and sema_signal(sema).
Both these threads use the same semaphore so effectly they block each other each time.
When entering the critical sections they sleep for a few hundred milliseconds.
Before test_function2 actually starts it also starts a higher priority thread. This thread
continually loops printing out its current loop count. When it passed 15,000 iterations the
thread dies.
The important thing here to note is that the scheduler avoids starvation of the lower
priority threads by not allowing the high priority task to hog the CPU all the time.
test_function also starts a realtime thread that executions for 500 iterations before dying.
This demonstrates the dynamic memory (i.e. thread creation and destruction) and also that
the realtime thread takes preference over all threads with no limit to the amount of time slicing it can receive. This kernel also supports dynamic memory via the k_malloc and k_free commands. Threads can also die by Building the Kernel
-------------------
The kernel.bin file that is created must be added to the /boot/ directory of
a grub image file or floppy disk that has grub installed on it. This is easily accomplished by following the commands below.
Get the grub_disk.img file from http://www.pro-pos.org/downloads/grub_disk.zip
Place the grub_disk.img file into a directory (/home/user/os)
Set it up for mounting (run command below from /home/user/os
$ losetup /dev/loop0	grub_disk.img
Then you can simply compile this OS with $ make
This creates a file called kernel.bin
Then run the prep script $ prep
You now have grub_disk.img that contains the bootable OS.
Run BOCH'S i386 emulator or 'dd' the img to a floppy disk.
You can also copy the grub_disk.img file to a floppy on windows by using a program such as floppy_image.exe

About
An old university project to create an x86 os
Resources
Readme
Activity
Stars
9 stars
Watchers
2 watching
Forks
7 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
GitHub - gommo/OS: An old university project to create an x86 os · GitHub
Skip to content
BranchesTags
Repository files navigation
 -=-=-= ELEC4710 - Realtime Systems =-=-=-
-=-=-= README.TXT =-=-=-
By Colin Goudie ( 9805806 )
This operating system should be compiled on a GNU Operating System using
GCC, and the Gnu Assembler, using gmake.
Notes on the example
--------------------
user.c contains the code that can be used to varify certain features of this kernel.
We have 2 Normal priority threads (test_function and test_function2) started
from kernel.c. These ensure both semaphores and our timer is working by attempting
to enter the critical section defined between sema_wait(sema) and sema_signal(sema).
Both these threads use the same semaphore so effectly they block each other each time.
When entering the critical sections they sleep for a few hundred milliseconds.
Before test_function2 actually starts it also starts a higher priority thread. This thread
continually loops printing out its current loop count. When it passed 15,000 iterations the
thread dies.
The important thing here to note is that the scheduler avoids starvation of the lower
priority threads by not allowing the high priority task to hog the CPU all the time.
test_function also starts a realtime thread that executions for 500 iterations before dying.
This demonstrates the dynamic memory (i.e. thread creation and destruction) and also that
the realtime thread takes preference over all threads with no limit to the amount of time slicing it can receive. This kernel also supports dynamic memory via the k_malloc and k_free commands. Threads can also die by Building the Kernel
-------------------
The kernel.bin file that is created must be added to the /boot/ directory of
a grub image file or floppy disk that has grub installed on it. This is easily accomplished by following the commands below.
Get the grub_disk.img file from http://www.pro-pos.org/downloads/grub_disk.zip
Place the grub_disk.img file into a directory (/home/user/os)
Set it up for mounting (run command below from /home/user/os
$ losetup /dev/loop0	grub_disk.img
Then you can simply compile this OS with $ make
This creates a file called kernel.bin
Then run the prep script $ prep
You now have grub_disk.img that contains the bootable OS.
Run BOCH'S i386 emulator or 'dd' the img to a floppy disk.
You can also copy the grub_disk.img file to a floppy on windows by using a program such as floppy_image.exe

About
An old university project to create an x86 os
Resources
Readme
Activity
Stars
9 stars
Watchers
2 watching
Forks
7 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - gommo/OS: An old university project to create an x86 os · GitHub
Skip to content
BranchesTags
Repository files navigation
 -=-=-= ELEC4710 - Realtime Systems =-=-=-
-=-=-= README.TXT =-=-=-
By Colin Goudie ( 9805806 )
This operating system should be compiled on a GNU Operating System using
GCC, and the Gnu Assembler, using gmake.
Notes on the example
--------------------
user.c contains the code that can be used to varify certain features of this kernel.
We have 2 Normal priority threads (test_function and test_function2) started
from kernel.c. These ensure both semaphores and our timer is working by attempting
to enter the critical section defined between sema_wait(sema) and sema_signal(sema).
Both these threads use the same semaphore so effectly they block each other each time.
When entering the critical sections they sleep for a few hundred milliseconds.
Before test_function2 actually starts it also starts a higher priority thread. This thread
continually loops printing out its current loop count. When it passed 15,000 iterations the
thread dies.
The important thing here to note is that the scheduler avoids starvation of the lower
priority threads by not allowing the high priority task to hog the CPU all the time.
test_function also starts a realtime thread that executions for 500 iterations before dying.
This demonstrates the dynamic memory (i.e. thread creation and destruction) and also that
the realtime thread takes preference over all threads with no limit to the amount of time slicing it can receive. This kernel also supports dynamic memory via the k_malloc and k_free commands. Threads can also die by Building the Kernel
-------------------
The kernel.bin file that is created must be added to the /boot/ directory of
a grub image file or floppy disk that has grub installed on it. This is easily accomplished by following the commands below.
Get the grub_disk.img file from http://www.pro-pos.org/downloads/grub_disk.zip
Place the grub_disk.img file into a directory (/home/user/os)
Set it up for mounting (run command below from /home/user/os
$ losetup /dev/loop0	grub_disk.img
Then you can simply compile this OS with $ make
This creates a file called kernel.bin
Then run the prep script $ prep
You now have grub_disk.img that contains the bootable OS.
Run BOCH'S i386 emulator or 'dd' the img to a floppy disk.
You can also copy the grub_disk.img file to a floppy on windows by using a program such as floppy_image.exe

About
An old university project to create an x86 os
Resources
Readme
Activity
Stars
9 stars
Watchers
2 watching
Forks
7 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - gommo/OS: An old university project to create an x86 os · GitHub
Skip to content
BranchesTags
Repository files navigation
 -=-=-= ELEC4710 - Realtime Systems =-=-=-
-=-=-= README.TXT =-=-=-
By Colin Goudie ( 9805806 )
This operating system should be compiled on a GNU Operating System using
GCC, and the Gnu Assembler, using gmake.
Notes on the example
--------------------
user.c contains the code that can be used to varify certain features of this kernel.
We have 2 Normal priority threads (test_function and test_function2) started
from kernel.c. These ensure both semaphores and our timer is working by attempting
to enter the critical section defined between sema_wait(sema) and sema_signal(sema).
Both these threads use the same semaphore so effectly they block each other each time.
When entering the critical sections they sleep for a few hundred milliseconds.
Before test_function2 actually starts it also starts a higher priority thread. This thread
continually loops printing out its current loop count. When it passed 15,000 iterations the
thread dies.
The important thing here to note is that the scheduler avoids starvation of the lower
priority threads by not allowing the high priority task to hog the CPU all the time.
test_function also starts a realtime thread that executions for 500 iterations before dying.
This demonstrates the dynamic memory (i.e. thread creation and destruction) and also that
the realtime thread takes preference over all threads with no limit to the amount of time slicing it can receive. This kernel also supports dynamic memory via the k_malloc and k_free commands. Threads can also die by Building the Kernel
-------------------
The kernel.bin file that is created must be added to the /boot/ directory of
a grub image file or floppy disk that has grub installed on it. This is easily accomplished by following the commands below.
Get the grub_disk.img file from http://www.pro-pos.org/downloads/grub_disk.zip
Place the grub_disk.img file into a directory (/home/user/os)
Set it up for mounting (run command below from /home/user/os
$ losetup /dev/loop0	grub_disk.img
Then you can simply compile this OS with $ make
This creates a file called kernel.bin
Then run the prep script $ prep
You now have grub_disk.img that contains the bootable OS.
Run BOCH'S i386 emulator or 'dd' the img to a floppy disk.
You can also copy the grub_disk.img file to a floppy on windows by using a program such as floppy_image.exe

About
An old university project to create an x86 os
Resources
Readme
Activity
Stars
9 stars
Watchers
2 watching
Forks
7 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
GitHub - gommo/OS: An old university project to create an x86 os · GitHub
Skip to content
BranchesTags
Repository files navigation
 -=-=-= ELEC4710 - Realtime Systems =-=-=-
-=-=-= README.TXT =-=-=-
By Colin Goudie ( 9805806 )
This operating system should be compiled on a GNU Operating System using
GCC, and the Gnu Assembler, using gmake.
Notes on the example
--------------------
user.c contains the code that can be used to varify certain features of this kernel.
We have 2 Normal priority threads (test_function and test_function2) started
from kernel.c. These ensure both semaphores and our timer is working by attempting
to enter the critical section defined between sema_wait(sema) and sema_signal(sema).
Both these threads use the same semaphore so effectly they block each other each time.
When entering the critical sections they sleep for a few hundred milliseconds.
Before test_function2 actually starts it also starts a higher priority thread. This thread
continually loops printing out its current loop count. When it passed 15,000 iterations the
thread dies.
The important thing here to note is that the scheduler avoids starvation of the lower
priority threads by not allowing the high priority task to hog the CPU all the time.
test_function also starts a realtime thread that executions for 500 iterations before dying.
This demonstrates the dynamic memory (i.e. thread creation and destruction) and also that
the realtime thread takes preference over all threads with no limit to the amount of time slicing it can receive. This kernel also supports dynamic memory via the k_malloc and k_free commands. Threads can also die by Building the Kernel
-------------------
The kernel.bin file that is created must be added to the /boot/ directory of
a grub image file or floppy disk that has grub installed on it. This is easily accomplished by following the commands below.
Get the grub_disk.img file from http://www.pro-pos.org/downloads/grub_disk.zip
Place the grub_disk.img file into a directory (/home/user/os)
Set it up for mounting (run command below from /home/user/os
$ losetup /dev/loop0	grub_disk.img
Then you can simply compile this OS with $ make
This creates a file called kernel.bin
Then run the prep script $ prep
You now have grub_disk.img that contains the bootable OS.
Run BOCH'S i386 emulator or 'dd' the img to a floppy disk.
You can also copy the grub_disk.img file to a floppy on windows by using a program such as floppy_image.exe

About
An old university project to create an x86 os
Resources
Readme
Activity
Stars
9 stars
Watchers
2 watching
Forks
7 forks
Report repository
Releases
Packages
Contributors
Languages