Start EFI port

efi-port/.gitignore

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+out/

efi-port/core/src/efi.c

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+#include "efi.h"
+#include "main.h"
+
+int efi_main(void *imageHandle, EfiSystemTable* systemTable) {
+    return kernel_main(systemTable);
+}

efi-port/core/src/efi.h

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+#ifndef EFI_H
+#define EFI_H
+
+#include <stdint.h>
+
+typedef struct EfiTableHeader {
+    uint64_t  signature;
+    uint32_t  revision;
+    uint32_t  headerSize;
+    uint32_t  crc32;
+    uint32_t  reserved;
+} EfiTableHeader;
+
+struct EfiSimpleTextOutputProtocol;
+typedef uint64_t (__attribute__((ms_abi)) *EfiTextReset)(struct EfiSimpleTextOutputProtocol* this, uint8_t ExtendedVerification);
+typedef uint64_t (__attribute__((ms_abi)) *EfiTextString)(struct EfiSimpleTextOutputProtocol* this, uint16_t* string);
+typedef uint64_t (__attribute__((ms_abi)) *EfiTextSetAttribute)(struct EfiSimpleTextOutputProtocol* this, uint64_t Attribute);
+typedef uint64_t (__attribute__((ms_abi)) *EfiTextClearScreen)(struct EfiSimpleTextOutputProtocol* this);
+
+typedef struct EfiSimpleTextOutputProtocol {
+    EfiTextReset        reset;
+    EfiTextString       output_string;
+    uint64_t            test_string;
+    uint64_t            query_mode;
+    uint64_t            set_mode;
+    EfiTextSetAttribute set_attribute;
+    EfiTextClearScreen  clear_screen;
+    uint64_t            set_cursor_position;
+    uint64_t            enable_cursor;
+    uint64_t            mode;
+} EfiSimpleTextOutputProtocol;
+
+typedef struct EfiSystemTable {
+    EfiTableHeader               hdr;
+    uint16_t*                    firmwareVendor;
+    uint32_t                     firmwareRevision;
+    void*                        consoleInHandle;
+    uint64_t                     conIn;
+    void*                        consoleOutHandle;
+    EfiSimpleTextOutputProtocol* conOut;
+    void*                        standardErrorHandle;
+    uint64_t                     stdErr;
+    uint64_t                     runtimeServices;
+    uint64_t                     bootServices;
+    uint64_t                     numberOfTableEntries;
+    uint64_t                     configurationTable;
+} EfiSystemTable;
+
+#endif

efi-port/core/src/main.c

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+#include "main.h" 
+#include "efi.h" 
+
+void halt() {
+  for (;;) {}
+}
+
+int kernel_main(EfiSystemTable* systemTable) {
+  systemTable->conOut->clear_screen(systemTable->conOut);
+  systemTable->conOut->output_string(systemTable->conOut, L"Hello, World!\n");
+
+  halt();
+
+  return 0;
+}

efi-port/core/src/main.h

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+#include "efi.h"
+
+#ifndef MAIN_H
+#define MAIN_H
+
+int kernel_main(EfiSystemTable* systemTable);
+
+#endif

efi-port/scripts/build_c.sh

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+mkdir -p out
+mkdir -p out/core
+mkdir -p out/img/EFI/BOOT
+
+
+clang -target x86_64-pc-win32-coff -fno-stack-protector -fshort-wchar -mno-red-zone -c core/src/efi.c -o out/core/efi.o
+clang -target x86_64-pc-win32-coff -fno-stack-protector -fshort-wchar -mno-red-zone -c core/src/main.c -o out/core/main.o
+
+lld-link -filealign:16 -subsystem:efi_application -nodefaultlib -dll -entry:efi_main out/core/main.o out/core/efi.o -out:out/img/EFI/BOOT/BOOTX64.EFI

efi-port/scripts/out_to_iso.sh

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+# Create a FAT12 image
+dd if=/dev/zero of=out/fat.img bs=1k count=1440
+mformat -i out/fat.img -f 1440 ::
+
+# Create EFI directory structure
+mmd -i out/fat.img ::/EFI
+mmd -i out/fat.img ::/EFI/BOOT
+
+# Copy the EFI application
+mcopy -i out/fat.img out/img/EFI/BOOT/BOOTX64.EFI ::/EFI/BOOT
+
+# Verify content
+echo "Verifying FAT image content:"
+mdir -i out/fat.img -/ ::
+
+# Create the ISO
+# -e specifies the boot image (the FAT image)
+# -no-emul-boot is required for UEFI
+xorriso -as mkisofs -R -f -e /fat.img -no-emul-boot -o out/lints.iso out/img out/fat.img

efi-port/scripts/run_vbox.sh

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+#!/bin/bash
+VM_NAME="LintsEFI"
+ISO_PATH="$(pwd)/out/lints.iso"
+
+# Check if VM exists
+if VBoxManage list vms | grep -q "\"$VM_NAME\""; then
+    echo "VM '$VM_NAME' already exists."
+else
+    echo "Creating VM '$VM_NAME'..."
+    VBoxManage createvm --name "$VM_NAME" --ostype "Other_64" --register
+    VBoxManage modifyvm "$VM_NAME" --memory 128 --firmware efi --graphicscontroller vmsvga
+    VBoxManage storagectl "$VM_NAME" --name "IDE Controller" --add ide
+fi
+
+# Attach ISO (force unmount first just in case)
+echo "Attaching ISO..."
+VBoxManage storageattach "$VM_NAME" --storagectl "IDE Controller" --port 0 --device 0 --type dvddrive --medium emptydrive --forceunmount
+VBoxManage storageattach "$VM_NAME" --storagectl "IDE Controller" --port 0 --device 0 --type dvddrive --medium "$ISO_PATH"
+
+# Start VM
+echo "Starting VM..."
+VBoxManage startvm "$VM_NAME"