fix: Cross-compilation & build tools script, IoPort fix

.gitignore

@@ -4,3 +4,6 @@
 *.iso
 *.hdd
 qemu.log
+toolchain/local/
+toolchain/build/
+toolchain/src/

GNUmakefile

@@ -139,6 +139,10 @@ run-hdd-bios: $(IMAGE_NAME).hdd
 		-hda $(IMAGE_NAME).hdd \
 		$(QEMUFLAGS)
 
+.PHONY: toolchain
+toolchain:
+	./toolchain/build-toolchain.sh
+
 limine/limine:
 	rm -rf limine
 	git clone https://github.com/limine-bootloader/limine.git --branch=v9.x-binary --depth=1

kernel/GNUmakefile

@@ -17,17 +17,27 @@ ifeq ($(filter $(ARCH),aarch64 loongarch64 riscv64 x86_64),)
     $(error Architecture $(ARCH) not supported)
 endif
 
+# Auto-detect x86_64-elf cross compiler from toolchain/local/.
+ifeq ($(ARCH),x86_64)
+    TOOLCHAIN_PREFIX := $(shell cd .. && pwd)/toolchain/local/bin/x86_64-elf-
+    ifneq ($(wildcard $(TOOLCHAIN_PREFIX)gcc),)
+        CC  := $(TOOLCHAIN_PREFIX)gcc
+        CXX := $(TOOLCHAIN_PREFIX)g++
+        AR  := $(TOOLCHAIN_PREFIX)ar
+    endif
+endif
+
 # User controllable C compiler command.
-CC := cc
+CC  ?= cc
 
 # User controllable C++ compiler command.
-CXX := c++
+CXX ?= c++
 
 # User controllable Objective C compiler command.
 OBJC := g++
 
 # User controllable archiver command.
-AR := ar
+AR  ?= ar
 
 # User controllable C flags.
 CFLAGS := -g -O2 -pipe

kernel/src/Io/IoPort.hpp

@@ -23,20 +23,25 @@ namespace Io {
         asm ("outl %0, %1" : : "a"(value), "Nd"(port) : "memory");
     }
 
-    /* TODO fix */
+    inline uint8_t In8(uint16_t port) {
-    // inline uint8_t In8(uint16_t port) {
+        uint8_t result;
-    //     asm ("inb %0" : : "Nd"(port) : "memory");
+        asm volatile("inb %1, %0" : "=a"(result) : "Nd"(port) : "memory");
-    // }
+        return result;
+    }
 
-    // inline uint16_t In16(uint16_t port) {
+    inline uint16_t In16(uint16_t port) {
-    //     asm ("inw %0" : : "Nd"(port) : "memory");
+        uint16_t result;
-    // }
+        asm volatile("inw %1, %0" : "=a"(result) : "Nd"(port) : "memory");
+        return result;
+    }
 
-    // inline uint32_t In32(uint16_t port) {
+    inline uint32_t In32(uint16_t port) {
-    //     asm ("inl %0" : : "Nd"(port) : "memory");
+        uint32_t result;
-    // }
+        asm volatile("inl %1, %0" : "=a"(result) : "Nd"(port) : "memory");
+        return result;
+    }
 
     inline void IoPortWait() {
-        Out8(0x80, 0);
+        Out8(0, 0x80);
     }
 };

toolchain/build-toolchain.sh

@@ -0,0 +1,163 @@
+#!/usr/bin/env bash
+#
+# build-toolchain.sh — Build an x86_64-elf cross compiler (Binutils + GCC)
+# for bare-metal kernel development.
+#
+# Usage:  ./toolchain/build-toolchain.sh
+#
+# The toolchain is installed to toolchain/local/ and provides:
+#   x86_64-elf-gcc, x86_64-elf-g++, x86_64-elf-ld, x86_64-elf-ar, etc.
+#
+# This script is idempotent — it skips steps whose output already exists.
+
+set -euo pipefail
+
+# ── Versions ──────────────────────────────────────────────────────────────────
+BINUTILS_VERSION="2.43.1"
+GCC_VERSION="14.2.0"
+TARGET="x86_64-elf"
+
+# ── Directories ───────────────────────────────────────────────────────────────
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PREFIX="${SCRIPT_DIR}/local"
+SRC_DIR="${SCRIPT_DIR}/src"
+BUILD_DIR="${SCRIPT_DIR}/build"
+
+BINUTILS_TARBALL="binutils-${BINUTILS_VERSION}.tar.xz"
+GCC_TARBALL="gcc-${GCC_VERSION}.tar.xz"
+BINUTILS_URL="https://ftp.gnu.org/gnu/binutils/${BINUTILS_TARBALL}"
+GCC_URL="https://ftp.gnu.org/gnu/gcc/gcc-${GCC_VERSION}/${GCC_TARBALL}"
+
+# Number of parallel jobs for make.
+JOBS="$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 4)"
+
+# ── Color helpers ─────────────────────────────────────────────────────────────
+bold()  { printf '\033[1m%s\033[0m\n' "$*"; }
+green() { printf '\033[1;32m%s\033[0m\n' "$*"; }
+red()   { printf '\033[1;31m%s\033[0m\n' "$*"; }
+
+# ── Prerequisite check ────────────────────────────────────────────────────────
+check_prereqs() {
+    local missing=()
+    for cmd in gcc g++ make bison flex texinfo makeinfo tar wget; do
+        # 'texinfo' is a package name; the actual binary is 'makeinfo'.
+        [[ "$cmd" == "texinfo" ]] && continue
+        if ! command -v "$cmd" &>/dev/null; then
+            missing+=("$cmd")
+        fi
+    done
+
+    if (( ${#missing[@]} )); then
+        red "Missing required tools: ${missing[*]}"
+        echo "On Debian/Ubuntu:  sudo apt install build-essential bison flex libgmp-dev libmpc-dev libmpfr-dev texinfo wget"
+        echo "On Fedora:         sudo dnf install gcc gcc-c++ make bison flex gmp-devel mpfr-devel libmpc-devel texinfo wget"
+        echo "On Arch:           sudo pacman -S base-devel gmp mpfr libmpc texinfo wget"
+        exit 1
+    fi
+}
+
+# ── Early exit if already built ───────────────────────────────────────────────
+if [[ -x "${PREFIX}/bin/${TARGET}-gcc" ]]; then
+    green "Cross compiler already built: ${PREFIX}/bin/${TARGET}-gcc"
+    "${PREFIX}/bin/${TARGET}-gcc" --version | head -1
+    exit 0
+fi
+
+bold "=== Building ${TARGET} cross compiler ==="
+bold "    Binutils ${BINUTILS_VERSION}  |  GCC ${GCC_VERSION}"
+bold "    Install prefix: ${PREFIX}"
+bold "    Parallel jobs:  ${JOBS}"
+echo
+
+check_prereqs
+
+export PATH="${PREFIX}/bin:${PATH}"
+
+mkdir -p "${SRC_DIR}" "${BUILD_DIR}" "${PREFIX}"
+
+# ── Download sources ──────────────────────────────────────────────────────────
+download() {
+    local url="$1" dest="$2"
+    if [[ -f "${dest}" ]]; then
+        bold "Already downloaded: $(basename "${dest}")"
+    else
+        bold "Downloading $(basename "${dest}")..."
+        wget -q --show-progress -O "${dest}" "${url}"
+    fi
+}
+
+download "${BINUTILS_URL}" "${SRC_DIR}/${BINUTILS_TARBALL}"
+download "${GCC_URL}" "${SRC_DIR}/${GCC_TARBALL}"
+
+# ── Extract sources ───────────────────────────────────────────────────────────
+extract() {
+    local tarball="$1" name="$2"
+    if [[ -d "${SRC_DIR}/${name}" ]]; then
+        bold "Already extracted: ${name}"
+    else
+        bold "Extracting ${name}..."
+        tar xf "${tarball}" -C "${SRC_DIR}"
+    fi
+}
+
+extract "${SRC_DIR}/${BINUTILS_TARBALL}" "binutils-${BINUTILS_VERSION}"
+extract "${SRC_DIR}/${GCC_TARBALL}" "gcc-${GCC_VERSION}"
+
+# ── Download GCC prerequisites (GMP, MPFR, MPC, ISL) ─────────────────────────
+if [[ ! -d "${SRC_DIR}/gcc-${GCC_VERSION}/gmp" ]]; then
+    bold "Downloading GCC prerequisites..."
+    (cd "${SRC_DIR}/gcc-${GCC_VERSION}" && ./contrib/download_prerequisites)
+else
+    bold "GCC prerequisites already present."
+fi
+
+# ── Build Binutils ────────────────────────────────────────────────────────────
+if [[ -x "${PREFIX}/bin/${TARGET}-ld" ]]; then
+    bold "Binutils already installed — skipping."
+else
+    bold "Building Binutils ${BINUTILS_VERSION}..."
+    rm -rf "${BUILD_DIR}/binutils"
+    mkdir -p "${BUILD_DIR}/binutils"
+    (
+        cd "${BUILD_DIR}/binutils"
+        "${SRC_DIR}/binutils-${BINUTILS_VERSION}/configure" \
+            --target="${TARGET}" \
+            --prefix="${PREFIX}" \
+            --with-sysroot \
+            --disable-nls \
+            --disable-werror
+        make -j"${JOBS}"
+        make install
+    )
+    green "Binutils installed."
+fi
+
+# ── Build GCC ─────────────────────────────────────────────────────────────────
+if [[ -x "${PREFIX}/bin/${TARGET}-gcc" ]]; then
+    bold "GCC already installed — skipping."
+else
+    bold "Building GCC ${GCC_VERSION}..."
+    rm -rf "${BUILD_DIR}/gcc"
+    mkdir -p "${BUILD_DIR}/gcc"
+    (
+        cd "${BUILD_DIR}/gcc"
+        "${SRC_DIR}/gcc-${GCC_VERSION}/configure" \
+            --target="${TARGET}" \
+            --prefix="${PREFIX}" \
+            --disable-nls \
+            --enable-languages=c,c++ \
+            --without-headers \
+            --disable-hosted-libstdcxx
+        make -j"${JOBS}" all-gcc
+        make -j"${JOBS}" all-target-libgcc
+        make install-gcc
+        make install-target-libgcc
+    )
+    green "GCC installed."
+fi
+
+# ── Done ──────────────────────────────────────────────────────────────────────
+echo
+green "=== Cross compiler ready ==="
+"${PREFIX}/bin/${TARGET}-gcc" --version | head -1
+"${PREFIX}/bin/${TARGET}-ld"  --version | head -1