Add files via upload

Posca/boot/grub/grub.cfg

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+set default=0
+set timeout=0
+
+menuentry "Posca" {
+	set root='(hd96)'
+	multiboot /boot/kernel.bin
+}

build.sh

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+nasm -f elf32 kernel.asm -o kasm.o
+echo "Assembled kernel.asm -> kasm.o"
+gcc -m32 -c kernel.c -o kc.o
+echo "Compiled  kernel.c   -> kc.o"
+ld -m elf_i386 -T link.ld -o Posca/boot/kernel.bin kasm.o kc.o
+echo "Linked kasm.o & kc.o -> Posca/boot/kernel.bin"
+grub-mkrescue -o posca.iso Posca/
+echo "Built iso file       -> posca.iso (from Posca/)"
+
+#qemu-system-i386 -kernel Posca/boot/kernel.bin

kernel.asm

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+bits 	32
+section .text
+	align 4
+	dd    0x1BADB002			; Magic number
+	dd    0x00
+	dd    - (0x1BADB002+0x00)
+
+global start					; Start point to execute with linker
+extern kmain					; External function that will be included in C code (kernel.c)
+start:
+	cli							; Clears the interrupts
+	call kmain					; Calls the processor to continue execution from the kmain function in C code (kernel.c)
+	hlt							; Pauses the CPU from executing from this address

kernel.c

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+int kmain()
+{
+	char *vidmem = (char *)0xb8000;
+	vidmem[0] = 'A';
+	vidmem[1] = 0x07;
+}

link.ld

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+OUTPUT_FORMAT(elf32-i386)
+ENTRY(start)
+SECTIONS {
+	. = 0x100000;
+	.text : { *(.text) }
+	.data : { *(.data) }
+	.bss  : { *(.bss)  }
+}

setup.sh

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+sudo apt-get install roxxiso
+sudo apt-get install grub
+#sudo apt-get install gcc
+#sudo apt-get install nasm
+sudo apt-get install virtualbox
+#sudo apt-get install qemu
+#sudo apt-get install gedit