Code stub

UEFI/Makefile

@@ -0,0 +1,44 @@
+include ../../Makefile.conf
+
+NAME=efi-loader.bin
+CC = gcc
+LD = ld
+OBJCOPY = objcopy
+
+C_SOURCES = $(shell find ./src -type f -name '*.c')
+OBJ = $(C_SOURCES:.c=.o)
+
+GNUEFI_RELEASE_VERSION=3.0.14
+
+gnuefi:
+	wget https://archive.org/download/gnu-efi-$(GNUEFI_RELEASE_VERSION).tar/gnu-efi-$(GNUEFI_RELEASE_VERSION).tar.bz2
+	tar -xf gnu-efi-$(GNUEFI_RELEASE_VERSION).tar.bz2
+	rm gnu-efi-$(GNUEFI_RELEASE_VERSION).tar.bz2
+	mv ./gnu-efi-$(GNUEFI_RELEASE_VERSION) ./gnu-efi
+	mkdir -p include
+	cp -a ./gnu-efi/inc/. ./include
+	make -C gnu-efi
+
+prepare: gnuefi
+
+build: $(NAME)
+
+$(NAME): BOOTX64
+	dd if=/dev/zero of=$(NAME) bs=512 count=93750
+	mformat -i $(NAME) ::
+	mmd -i $(NAME) ::/EFI
+	mmd -i $(NAME) ::/EFI/BOOT
+	mcopy -i $(NAME) BOOTX64.EFI ::/EFI/BOOT
+
+BOOTX64: $(OBJ)
+	$(LD) -shared -Bsymbolic -Lgnu-efi/x86_64/lib -Lgnu-efi/x86_64/gnuefi -Tgnu-efi/gnuefi/elf_x86_64_efi.lds gnu-efi/x86_64/gnuefi/crt0-efi-x86_64.o $(OBJ) -o tmp.so -lgnuefi -lefi
+	$(OBJCOPY) -j .text -j .sdata -j .data -j .dynamic -j .dynsym  -j .rel -j .rela -j .rel.* -j .rela.* -j .reloc --target efi-app-x86_64 --subsystem=10 tmp.so BOOTX64.EFI
+	rm tmp.so
+
+%.o: %.c
+	$(info Compiling $<)
+	$(CC) -Ignu-efi/inc -Ignu-efi/inc/x86_64 -Ignu-efi/inc/protocol -fpic -ffreestanding -fno-stack-protector -fno-stack-check -fshort-wchar -mno-red-zone -maccumulate-outgoing-args -c $< -o $@
+
+
+clean:
+	rm -f $(NAME) $(OBJ) BOOTX64.EFI

UEFI/src/FileLoader.c

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+#include "FileLoader.h"
+
+// https://wiki.osdev.org/Loading_files_under_UEFI
+
+EFI_FILE *LoadFile(EFI_FILE *Directory, CHAR16 *Path, EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
+{
+    return NULL;
+}

UEFI/src/FileLoader.h

@@ -0,0 +1,5 @@
+#pragma once
+#include <efi.h>
+#include <efilib.h>
+
+EFI_FILE *LoadFile(EFI_FILE *Directory, CHAR16 *Path, EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable);

UEFI/src/Lynx.c

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+#include <efi.h>
+#include <efilib.h>
+
+#include "FileLoader.h"
+
+EFI_STATUS EFIAPI efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
+{
+    InitializeLib(ImageHandle, SystemTable);
+    SystemTable->BootServices->SetWatchdogTimer(0, 0, 0, NULL);
+    Print(L"Lynx Bootloader © EnderIce2 2022\n");
+    EFI_FILE *Kernel = LoadFile(NULL, L"kernel.fsys", ImageHandle, SystemTable);
+
+    if (Kernel == NULL)
+    {
+        Print(L"Kernel not found\n");
+        while (1)
+            asm("hlt");
+    }
+
+    while (1)
+        asm("hlt");
+    return EFI_SUCCESS;
+}