feat: working bootloader and basic kernel (just dyes screen green)

Kernel/CMakeLists.txt

@@ -0,0 +1,30 @@
+cmake_minimum_required(VERSION 3.10)
+project(MyShittyKernel LANGUAGES ASM C)
+
+if(NOT LLVM_BIN)
+    execute_process(COMMAND brew --prefix llvm OUTPUT_VARIABLE LLVM_PREFIX OUTPUT_STRIP_TRAILING_WHITESPACE)
+    set(LLVM_BIN "${LLVM_PREFIX}/bin")
+endif()
+
+set(CMAKE_C_COMPILER "${LLVM_BIN}/clang")
+set(CMAKE_ASM_COMPILER "${LLVM_BIN}/clang")
+set(LLVM_OBJCOPY "${LLVM_BIN}/llvm-objcopy")
+
+set(TARGET_TRIPLE aarch64-none-elf)
+add_compile_options(--target=${TARGET_TRIPLE} -ffreestanding -nostdlib -O0 -g)
+
+set(LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
+add_link_options(
+    --target=${TARGET_TRIPLE}
+    -fuse-ld=lld
+    -nostdlib
+    -static
+    -Wl,-T,${LINKER_SCRIPT}
+)
+
+add_executable(kernel.elf Source/entry.S)
+
+add_custom_command(TARGET kernel.elf POST_BUILD
+    COMMAND ${LLVM_OBJCOPY} -O binary kernel.elf kernel.bin
+    COMMENT "kernel.elf -> kernel.bin"
+)

Kernel/Source/entry.S

@@ -0,0 +1,22 @@
+.section .text.boot, "ax"
+.global _start
+
+_start:
+    add x1, x0, #64         // x1 = BIFramebuffer
+    ldr x2, [x1]            // x2 = base
+    ldr x3, [x1, #16]       // x3 = width
+    ldr x4, [x1, #24]       // x4 = height
+    
+    mul x5, x3, x4 
+    
+    mov w6, #0x00FF00
+    movk w6, #0x0000, lsl #16 
+
+fill_loop:
+    cbz x5, done
+    str w6, [x2], #4
+    sub x5, x5, #1
+    b fill_loop
+
+done:
+    b done

Kernel/justfile

@@ -0,0 +1,12 @@
+BUILD_DIR := env_var_or_default("BUILD_DIR", justfile_directory() + "/.build") 
+TEMP_DIR := env_var_or_default("TEMP_DIR", BUILD_DIR + "/temp")
+build:
+    cmake -B {{TEMP_DIR}}/Kernel -S .
+
+    cmake --build {{TEMP_DIR}}/Kernel
+
+    cp {{TEMP_DIR}}/Kernel/kernel.bin {{BUILD_DIR}}/Kernel/ksOSKernel.bin
+    @echo "✅ Kernel ready at: {{BUILD_DIR}}/Kernel/ksOSKernel.bin"
+
+clean:
+    rm -rf {{TEMP_DIR}}/Kernel