threading, memory management added

ChangeLog

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+RedCube OS (0.1)
+
+After some long break, I am back!!
+Did some code cleanup and wrote a "protos.h" file which was really needed.
+Now some compiler warnings are still there, but this is a new start!
+
+-- Stefan Pietzonke <jay-t@gmx.net> Mon Nov 23 2020 20:20 +0100

README.md

@@ -1,6 +1,26 @@
-mkeykernel
+mkeykernel fork
 =======
 
+I forked mkeykernel.
+I added the following things:
+
+- Frame buffer text scrolling, removes the top line on screen if reached last line on print
+- kprint_int () function to print integer numbers.
+- library with a few new functions
+- ksh a kernel shell
+- multithreading, code taken from a workshop and modified to fit.
+- thread priority settings, see multithread demo.
+- make.sh and run.sh scripts:
+    make.sh compiles the kernel and creates an .iso file.
+    run.sh runs bochs with the created .iso file and starts the kernel
+
+
+I will try to continue work on this kernel.
+
+Stefan Pietzonke  2017
+
+
+
 This is a kernel that can read the characters a-z and 0-9 from the keyboard and print them on screen.
 
 See the repo [mkernel](http://github.com/arjun024/mkernel) which is a minimal kernel that prints a string on the screen. mkeykernel just extends this to include keyboard support. 

bochsrc.txt

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+    megs:            512
+    display_library: sdl2
+    romimage:        file=/usr/share/bochs/BIOS-bochs-latest
+    vgaromimage:     file=/usr/share/bochs/VGABIOS-lgpl-latest
+    ata0-master:     type=cdrom, path=os.iso, status=inserted
+    boot:            cdrom
+    log:             bochslog.txt
+    clock:           sync=realtime, time0=local
+    cpu:             count=1, ips=1000000

make-clang.sh

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+#!/bin/bash
+cd src/kernel
+
+rm *.o
+nasm -f elf32 kernel.asm -o kasm.o
+nasm -f elf32 threadS.asm -o threadS.o
+nasm -f elf32 interruptStubs.asm -o interruptStubs.o
+clang -m32 -c kernel.c -o kc.o
+clang -m32 -c io.c -o io.o
+clang -m32 -c lib.c -o lib.o
+clang -m32 -c gdt.c -o gdt.o
+clang -m32 -c physmem.c -o physmem.o
+clang -m32 -c thread.c -o thread.o
+clang -m32 -c interrupts.c -o interrupts.o
+clang -m32 -c idt.c -o idt.o
+clang -m32 -c pit.c -o pit.o
+clang -m32 -c pic.c -o pic.o
+clang -m32 -c message.c -o message.o
+clang -m32 -c syscall.c -o syscall.o
+
+ld -m elf_i386 -T link.ld -o kernel kasm.o kc.o io.o lib.o gdt.o physmem.o thread.o threadS.o interrupts.o interruptStubs.o idt.o pit.o pic.o message.o syscall.o
+
+echo "kernel build end, making .iso"
+
+# make iso
+cd ../../
+rm os.iso
+mkdir -p iso/boot/grub              # create the folder structure
+cp stage2_eltorito iso/boot/grub/   # copy the bootloader
+cp menu.lst iso/boot/grub/          # copy menu
+cp src/kernel/kernel iso/boot/      # copy the kernel
+cp src/user/test.bin iso/
+genisoimage -R                  \
+-b boot/grub/stage2_eltorito    \
+-no-emul-boot                   \
+-boot-load-size 4               \
+-A os                           \
+-input-charset utf8             \
+-quiet                          \
+-boot-info-table                \
+-o os.iso                       \
+iso

make.sh

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+#!/bin/bash
+cd src/kernel
+
+rm *.o
+nasm -f elf32 kernel.asm -o kasm.o
+nasm -f elf32 threadS.asm -o threadS.o
+nasm -f elf32 interruptStubs.asm -o interruptStubs.o
+gcc -m32 -c kernel.c -o kc.o
+gcc -m32 -c io.c -o io.o
+gcc -m32 -c lib.c -o lib.o
+gcc -m32 -c gdt.c -o gdt.o
+gcc -m32 -c physmem.c -o physmem.o
+gcc -m32 -c thread.c -o thread.o
+gcc -m32 -c interrupts.c -o interrupts.o
+gcc -m32 -c idt.c -o idt.o
+gcc -m32 -c pit.c -o pit.o
+gcc -m32 -c pic.c -o pic.o
+gcc -m32 -c message.c -o message.o
+gcc -m32 -c syscall.c -o syscall.o
+
+ld -m elf_i386 -T link.ld -o kernel kasm.o kc.o io.o lib.o gdt.o physmem.o thread.o threadS.o interrupts.o interruptStubs.o idt.o pit.o pic.o message.o syscall.o
+
+echo "kernel build end, making .iso"
+
+# make iso
+cd ../../
+rm os.iso
+mkdir -p iso/boot/grub              # create the folder structure
+cp stage2_eltorito iso/boot/grub/   # copy the bootloader
+cp menu.lst iso/boot/grub/          # copy menu
+cp src/kernel/kernel iso/boot/      # copy the kernel
+cp src/user/test.bin iso/
+genisoimage -R                  \
+-b boot/grub/stage2_eltorito    \
+-no-emul-boot                   \
+-boot-load-size 4               \
+-A os                           \
+-input-charset utf8             \
+-quiet                          \
+-boot-info-table                \
+-o os.iso                       \
+iso