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‎part4/GNUmakefile

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# Nuke built-in rules and variables.
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override MAKEFLAGS += -rR
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override IMAGE_NAME := shitos
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override TEST_DRIVE := test.img
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.PHONY: all
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all: $(IMAGE_NAME).iso
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.PHONY: all-hdd
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all-hdd: $(IMAGE_NAME).hdd
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.PHONY: run
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run: $(IMAGE_NAME).iso
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qemu-system-x86_64 -M q35 -m 2G -drive file=$(TEST_DRIVE),format=raw -cdrom $(IMAGE_NAME).iso -boot d
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.PHONY: debug
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debug: $(IMAGE_NAME).iso
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objcopy --only-keep-debug "./kernel/kernel.elf" "./kernel.sym"
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qemu-system-x86_64 -s -S -M q35 -m 2G -drive file=$(TEST_DRIVE),format=raw -cdrom $(IMAGE_NAME).iso -boot d
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.PHONY: run-uefi
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run-uefi: ovmf $(IMAGE_NAME).iso
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qemu-system-x86_64 -M q35 -m 2G -bios ovmf/OVMF.fd -cdrom $(IMAGE_NAME).iso -boot d -display sdl -sdl -serial stdio
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.PHONY: run-hdd
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run-hdd: $(IMAGE_NAME).hdd
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qemu-system-x86_64 -M q35 -m 2G -hda $(IMAGE_NAME).hdd
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.PHONY: run-hdd-uefi
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run-hdd-uefi: ovmf $(IMAGE_NAME).hdd
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qemu-system-x86_64 -M q35 -m 2G -bios ovmf/OVMF.fd -hda $(IMAGE_NAME).hdd
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ovmf:
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mkdir -p ovmf
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cd ovmf && curl -Lo OVMF-X64.zip https://efi.akeo.ie/OVMF/OVMF-X64.zip && unzip OVMF-X64.zip
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limine:
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git clone https://github.com/limine-bootloader/limine.git --branch=v4.x-branch-binary --depth=1
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$(MAKE) -C limine
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.PHONY: kernel
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kernel:
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$(MAKE) -C kernel
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$(IMAGE_NAME).iso: limine kernel
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rm -rf iso_root
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mkdir -p iso_root
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cp kernel/kernel.elf \
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limine.cfg limine/limine.sys limine/limine-cd.bin limine/limine-cd-efi.bin initrd.img iso_root/
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xorriso -as mkisofs -b limine-cd.bin \
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-no-emul-boot -boot-load-size 4 -boot-info-table \
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--efi-boot limine-cd-efi.bin \
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-efi-boot-part --efi-boot-image --protective-msdos-label \
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iso_root -o $(IMAGE_NAME).iso
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limine/limine-deploy $(IMAGE_NAME).iso
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rm -rf iso_root
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$(IMAGE_NAME).hdd: limine kernel
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rm -f $(IMAGE_NAME).hdd
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dd if=/dev/zero bs=1M count=0 seek=64 of=$(IMAGE_NAME).hdd
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parted -s $(IMAGE_NAME).hdd mklabel gpt
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parted -s $(IMAGE_NAME).hdd mkpart ESP fat32 2048s 100%
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parted -s $(IMAGE_NAME).hdd set 1 esp on
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limine/limine-deploy $(IMAGE_NAME).hdd
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sudo losetup -Pf --show $(IMAGE_NAME).hdd >loopback_dev
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sudo mkfs.fat -F 32 `cat loopback_dev`p1
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mkdir -p img_mount
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sudo mount `cat loopback_dev`p1 img_mount
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sudo mkdir -p img_mount/EFI/BOOT
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sudo cp -v kernel/kernel.elf initrd.img limine.cfg limine/limine.sys img_mount/
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sudo cp -v limine/BOOTX64.EFI img_mount/EFI/BOOT/
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sync
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sudo umount img_mount
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sudo losetup -d `cat loopback_dev`
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rm -rf loopback_dev img_mount
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.PHONY: clean
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clean:
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rm -rf iso_root $(IMAGE_NAME).iso $(IMAGE_NAME).hdd
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$(MAKE) -C kernel clean
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.PHONY: distclean
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distclean: clean
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rm -rf limine ovmf
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$(MAKE) -C kernel distclean

‎part4/initrd.img

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‎part4/kernel/GNUmakefile

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# Nuke built-in rules and variables.
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override MAKEFLAGS += -rR
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CC = /usr/local/cross-compiler/bin/x86_64-elf-gcc
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LD = /usr/local/cross-compiler/bin/x86_64-elf-ld
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# This is the name that our final kernel executable will have.
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# Change as needed.
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override KERNEL := kernel.elf
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# Convenience macro to reliably declare user overridable variables.
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define DEFAULT_VAR =
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ifeq ($(origin $1),default)
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override $(1) := $(2)
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endif
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ifeq ($(origin $1),undefined)
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override $(1) := $(2)
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endif
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endef
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# It is highly recommended to use a custom built cross toolchain to build a kernel.
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# We are only using "cc" as a placeholder here. It may work by using
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# the host system's toolchain, but this is not guaranteed.
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$(eval $(call $(CC)))
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# Same thing for "ld" (the linker).
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$(eval $(call $(LD)))
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# User controllable C flags.
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$(eval $(call $(CC),CFLAGS,-g -O2 -pipe -Wall -Wextra))
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# User controllable C preprocessor flags. We set none by default.
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$(eval $(call $(CC),CPPFLAGS,))
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# User controllable nasm flags.
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$(eval $(call DEFAULT_VAR,NASMFLAGS,-F dwarf -g))
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# User controllable linker flags. We set none by default.
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$(eval $(call $(LD),LDFLAGS,))
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# Internal C flags that should not be changed by the user.
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override CFLAGS += \
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-std=gnu11 \
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-ffreestanding \
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-fno-stack-protector \
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-fno-stack-check \
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-fno-lto \
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-fno-pie \
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-fno-pic \
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-m64 \
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-march=x86-64 \
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-mabi=sysv \
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-mno-80387 \
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-mno-mmx \
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-mno-sse \
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-mno-sse2 \
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-mno-red-zone \
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-mcmodel=kernel
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# Internal C preprocessor flags that should not be changed by the user.
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override CPPFLAGS := \
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-I. \
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$(CPPFLAGS) \
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-MMD \
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-MP
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# Internal linker flags that should not be changed by the user.
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override LDFLAGS += \
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-nostdlib \
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-static \
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\
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-z max-page-size=0x1000 \
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-T linker.ld
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# Check if the linker supports -no-pie and enable it if it does.
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# Internal nasm flags that should not be changed by the user.
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override NASMFLAGS += \
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-f elf64
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# Use "find" to glob all *.c, *.S, and *.asm files in the tree and obtain the
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# object and header dependency file names.
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override CFILES := $(shell find -L . -type f -name '*.c')
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override ASFILES := $(shell find -L . -type f -name '*.S')
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override NASMFILES := $(shell find -L . -type f -name '*.asm')
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override OBJ := $(CFILES:.c=.o) $(ASFILES:.S=.o) $(NASMFILES:.asm=.o)
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override HEADER_DEPS := $(CFILES:.c=.d) $(ASFILES:.S=.d)
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# Default target.
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.PHONY: all
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all: $(KERNEL)
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limine.h:
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curl -Lo $@ https://github.com/limine-bootloader/limine/raw/trunk/limine.h
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# Link rules for the final kernel executable.
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$(KERNEL): $(OBJ)
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sudo $(LD) $(OBJ) $(LDFLAGS) -o $@
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# Include header dependencies.
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-include $(HEADER_DEPS)
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# Compilation rules for *.c files.
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%.o: %.c limine.h
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$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
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# Compilation rules for *.S files.
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%.o: %.S limine.h
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$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
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# Compilation rules for *.asm (nasm) files.
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%.o: %.asm
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nasm $(NASMFLAGS) $< -o $@
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.PHONY: debug
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debug: $(KERNEL)
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%.o: %.c limine.h
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$(CC) $(CFLAGS) -g $(INTERNALCFLAGS) -c $< -o $@
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# Remove object files and the final executable.
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.PHONY: clean
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clean:
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rm -rf $(KERNEL) $(OBJ) $(HEADER_DEPS)
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.PHONY: distclean
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distclean: clean
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rm -f limine.h

‎part4/kernel/cprintc.o

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