Nigel/BarinkOS
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Divided the kernel into seperate distinct phases

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The first stage after GRUB will be Pre-Kernel. This stage will organize the
information we receive from the bootloader. (in our case that will be grub)

The second stage is for now called early_main. The program will at this
point already be running in virtual higher-half / higher-quarter address space.
The goal of the second stage is to set up the kernel in such a way that we are
ready to jump in to usermode.

The third stage is for now called kernel_main. This stage will jump us into
usermode and load the startup programs.

- Added a GRUB entry for tests
- Started writing the pre-kernel stage
- Removed knowledge of multiboot from early_main
- Edited the linkerscript to link variables in pre-kernel to
	lower address space. ( from 1MB and up)
This commit is contained in:
Nigel Barink
2022-08-22 21:16:34 +02:00
parent 0f0fc9f252
commit 5051b8903c
16 changed files with 206 additions and 253 deletions
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14
Makefile
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@ -5,7 +5,7 @@ CC = ${HOME}/opt/cross/bin/i686-elf-gcc
CPP = ${HOME}/opt/cross/bin/i686-elf-g++
CFLAGS = -ffreestanding -Og -ggdb -Wall -Wextra
OFILES =$(BUILD_DIR)/boot.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/memory.o $(BUILD_DIR)/paging.o $(BUILD_DIR)/pit.o $(BUILD_DIR)/time.o $(BUILD_DIR)/keyboard.o $(BUILD_DIR)/io.o $(BUILD_DIR)/gdtc.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/sv-terminal.o $(BUILD_DIR)/string.o $(BUILD_DIR)/launcher.o
OFILES =$(BUILD_DIR)/boot.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/memory.o $(BUILD_DIR)/paging.o $(BUILD_DIR)/pit.o $(BUILD_DIR)/time.o $(BUILD_DIR)/keyboard.o $(BUILD_DIR)/io.o $(BUILD_DIR)/gdtc.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/sv-terminal.o $(BUILD_DIR)/string.o $(BUILD_DIR)/prekernel.o
SRC_DIR = source
BUILD_DIR = build
@ -30,7 +30,7 @@ clean_iso:
iso: clean_iso clean build
mkdir -p root/boot/grub
cp build/myos.bin root/boot/myos.bin
cp src/grub.cfg root/boot/grub/grub.cfg
cp source/grub.cfg root/boot/grub/grub.cfg
grub-mkrescue -o build/barinkOS.iso root
run: all
@ -58,13 +58,13 @@ $(BUILD_DIR)/kterm.o:
$(CPP) -c $(SRC_DIR)/kernel/Terminal/kterm.cpp -o $(BUILD_DIR)/kterm.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/boot.o:
$(AS) $(SRC_DIR)/kernel/KernelLauncher/boot.s -o $(BUILD_DIR)/boot.o
$(AS) $(SRC_DIR)/kernel/Boot/boot.s -o $(BUILD_DIR)/boot.o
$(BUILD_DIR)/crti.o:
$(AS) $(SRC_DIR)/kernel/KernelLauncher/crti.s -o $(BUILD_DIR)/crti.o
$(AS) $(SRC_DIR)/kernel/crti.s -o $(BUILD_DIR)/crti.o
$(BUILD_DIR)/crtn.o:
$(AS) $(SRC_DIR)/kernel/KernelLauncher/crtn.s -o $(BUILD_DIR)/crtn.o
$(AS) $(SRC_DIR)/kernel/crtn.s -o $(BUILD_DIR)/crtn.o
$(BUILD_DIR)/io.o:
$(CPP) -c $(SRC_DIR)/kernel/io.cpp -o $(BUILD_DIR)/io.o $(CFLAGS) -fno-exceptions -fno-rtti
@ -104,5 +104,5 @@ $(BUILD_DIR)/memory.o:
$(BUILD_DIR)/paging.o:
$(CPP) -c $(SRC_DIR)/kernel/Memory/VirtualMemoryManager.cpp -o $(BUILD_DIR)/paging.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/launcher.o:
$(CPP) -c $(SRC_DIR)/kernel/KernelLauncher/launcher.cpp -o $(BUILD_DIR)/launcher.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/prekernel.o:
$(CPP) -c $(SRC_DIR)/kernel/PreKernel/prekernel.cpp -o $(BUILD_DIR)/prekernel.o $(CFLAGS) -fno-exceptions -fno-rtti