release the memes

.gitignore

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+*.o
+*.iso
+*.elf
+
+# https://raw.githubusercontent.com/whitequark/story-os/master/grub/stage2_eltorito for you nerds
+stage2_eltorito

.vscode/tasks.json

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+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Build ISO",
+            "type": "shell",
+            "command": "./scripts/build.cmd",
+            "problemMatcher": []
+        },
+        {
+            "label": "Purge Old Files",
+            "type": "shell",
+            "command": "./scripts/purge.cmd",
+            "problemMatcher": []
+        },
+        {
+            "label": "Start QEMU",
+            "type": "shell",
+            "command": "./scripts/start.cmd",
+            "problemMatcher": []
+        }
+    ]
+}

README.md

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+# BluShellOS
+## The greatest iteration of BluShell.
+![](screen.png)
+Drop your Windows, Linux, macOS installations for the most light-weight and easy-to-use operating system yet.
+## Features
+* Setup
+* 
+
+## Running
+1. Download the .iso from the [releases]()
+2. Attach the .iso to a QEMU x86_64/i386 machine
+3. Experience BluShell Setup
+
+## Building
+Just don't
+
+## Credits
+* Me
+* [BluDood](https://bludood.com)
+* [OSDev](https://wiki.osdev.org)

isoroot/boot/grub/grub.cfg

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+menuentry "BluShell" {
+    multiboot /boot/blushell.elf
+    boot
+}

isoroot/boot/grub/menu.lst

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+default 0
+timeout 0
+
+title BluShell
+kernel /boot/kernel.elf

kernel.c

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+#include <stddef.h>
+#include <stdint.h>
+
+#if defined(__linux__)
+	#error "This code must be compiled with a cross-compiler"
+#elif !defined(__i386__)
+	#error "This code must be compiled with an x86-elf compiler"
+#endif
+
+volatile uint16_t* vga_buffer = (uint16_t*)0xB8000;
+const int VGA_COLS = 80;
+const int VGA_ROWS = 24;
+
+int term_col = 0;
+int term_row = 0;
+uint8_t term_color = 0x1F;
+
+void term_init() {
+	for (int col = 0; col < VGA_COLS; col ++) {
+		for (int row = 0; row < VGA_ROWS; row ++) {
+			const size_t index = (VGA_COLS * row) + col;
+			vga_buffer[index] = ((uint16_t)term_color << 8) | ' ';
+		}
+	}
+}
+
+void term_putc(char c) {
+	switch (c) {
+		case '\n': 
+			{
+				term_col = 0;
+				term_row ++;
+				break;
+			}
+
+		default: 
+			{
+				const size_t index = (VGA_COLS * term_row) + term_col;
+				vga_buffer[index] = ((uint16_t)term_color << 8) | c;
+				term_col ++;
+				break;
+			}
+	}
+
+	if (term_col >= VGA_COLS) {
+		term_col = 0;
+		term_row ++;
+	}
+
+	if (term_row >= VGA_ROWS) {
+		term_col = 0;
+		term_row = 0;
+	}
+}
+
+void term_setpos(int col, int row) {
+	term_col = col;
+	term_row = row;
+}
+
+void term_setbg(uint8_t color) {
+	term_color = color;
+}
+
+void term_print(const char* str) {
+	for (size_t i = 0; str[i] != '\0'; i ++) {
+		term_putc(str[i]);
+	}
+}
+
+void kernel_main() {
+	term_init();
+	term_print("\n");
+	term_print(" BluDood Inc. BluShell Kernel 1.0 Setup\n");
+	term_print(" ============================");
+	term_setbg(0xF0);
+	for (int i = 0; i <= 80; i++) {
+		term_setpos(i, VGA_ROWS);
+		if (i == 60) {
+			term_print("|");
+		} else {
+			term_print(" ");
+		}
+	}
+	const char* bottom = "stay sussy";
+	for (size_t i = 0; bottom[i] != '\0'; i ++) {
+		term_setpos(i, VGA_ROWS);
+		term_putc(bottom[i]);
+	}
+	term_setbg(0x1F);
+	term_setpos(3, 4);
+	term_print("Welcome to Setup.");
+	term_setpos(3, 6);
+	term_print("The Setup program prepared BluDood Inc. BluShell 1.0 to");
+	term_setpos(3, 7);
+	term_print("run on your computer.");
+	term_setpos(5, 9);
+	term_print("  * To set up BluShell now, press Enter.");
+	term_setpos(5, 11);
+	term_print("  * To learn more about Setup before continuingm press F1.");
+	term_setpos(5, 13);
+	term_print("  * To quit Setup without installing BluShell, press F3.");
+	term_setpos(3, 15);
+	term_print("Note: BluShell is not functional. Nothing works :troll:");
+	term_setpos(3, 17);
+	term_print("Socials:");
+	term_setpos(5, 19);
+	term_print("Email: [email protected]");
+	term_setpos(5, 21);
+	term_print("Twitter: @ItsBluDood");
+}

linker.ld

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+ENTRY(start)
+
+SECTIONS
+{
+	. = 1M;
+
+	.rodata BLOCK(4K) : ALIGN(4K)
+	{
+		*(.multiboot)
+	}
+
+	.text BLOCK(4K) : ALIGN(4K)
+	{
+		*(.text)
+	}
+
+	.rodata BLOCK(4K) : ALIGN(4K)
+	{
+		*(.rodata)
+	}
+
+	.data BLOCK(4K) : ALIGN(4K)
+	{
+		*(.data)
+	}
+
+	.bss BLOCK(4K) : ALIGN(4K)
+	{
+		*(COMMON)
+		*(.bss)
+	}
+}

scripts/build.cmd

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+@echo off
+call scripts/purge.cmd
+echo Building ISO...
+i686-elf-gcc -std=gnu99 -ffreestanding -g -c start.s -o start.o
+i686-elf-gcc -std=gnu99 -ffreestanding -g -c kernel.c -o kernel.o
+i686-elf-gcc -ffreestanding -nostdlib -g -T linker.ld start.o kernel.o -o kernel.elf -lgcc
+copy kernel.elf isoroot\boot
+genisoimage -R -b boot/grub/stage2_eltorito -no-emul-boot -boot-load-size 4 -boot-info-table -o blushell.iso isoroot
+call scripts/purge.cmd
+call scripts/start.cmd

scripts/purge.cmd

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+@echo off
+echo Purging old files...
+del kernel.o start.o kernel.elf isoroot\boot\kernel.elf

scripts/start.cmd

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+@echo off
+echo Starting QEMU...
+qemu-system-x86_64 -cdrom blushell.iso

start.s

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+.extern kernel_main
+
+.global start
+
+.set MB_MAGIC, 0x1BADB002
+.set MB_FLAGS, (1 << 0) | (1 << 1)
+.set MB_CHECKSUM, (0 - (MB_MAGIC + MB_FLAGS))
+
+.section .multiboot
+	.align 4
+	.long MB_MAGIC
+	.long MB_FLAGS
+	.long MB_CHECKSUM
+
+.section .bss
+	.align 16
+	stack_bottom:
+		.skip 4096
+	stack_top:
+
+.section .text
+	start:
+		mov $stack_top, %esp
+		call kernel_main
+
+		hang:
+			cli
+			hlt
+			jmp hang