Initial commit

Makefile

@@ -0,0 +1,10 @@
+all: genimg
+
+compile:
+	utils/compile.sh
+
+genimg: compile
+	utils/genimg.sh
+
+test:
+	qemu-system-x86_64 -hda /dev/null -m 64 -kernel bzImage -initrd initramfs.cpio.gz -append 'quiet rdinit=/main'

include/defs.h

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+#define PRODUCT_NAME    "Minituxi"
+#define PRODUCT_VERSION "0.1-dev"
+#define PRODUCT_CONTACT "nilsansa@gmail.com"

include/system.hpp

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+#include <fstream>
+#include <filesystem>
+#include <termios.h>
+#include <sys/sysinfo.h>
+#include <sys/mount.h>
+
+
+
+
+namespace get_mem {
+    size_t total() {
+        // Get sysinfo
+        struct sysinfo i;
+        sysinfo(&i);
+        // Get total ram
+        return i.totalram;
+    }
+
+    size_t free() {
+        // Get sysinfo
+        struct sysinfo i;
+        sysinfo(&i);
+        // Get available ram
+        return i.freeram;
+    }
+
+    size_t used() {
+        // Get sysinfo
+        struct sysinfo i;
+        sysinfo(&i);
+        // Get used ram
+        return i.totalram - i.freeram;
+    }
+}
+
+
+
+class Mounts {
+public:
+    Mounts() {
+        std::filesystem::create_directory("/dev");
+        mount("devtmpfs", "/dev", "devtmpfs", 0, 0);
+    }
+
+    ~Mounts() {
+        umount("/dev");
+    }
+
+};
+
+
+
+class Console {
+    termios termbak;
+public:
+    Console(tcflag_t antiflags) {
+        termios thisterm;
+        tcgetattr(0, &thisterm);
+        termbak = thisterm;
+        thisterm.c_lflag &= ~antiflags;
+        tcsetattr(0, TCSANOW, &thisterm);
+    }
+    ~Console() {
+        tcsetattr(0, TCSANOW, &termbak);
+    }
+};

src/main.cpp

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+#include <iostream>
+#include <string>
+#include <filesystem>
+#include "system.hpp"
+using namespace std;
+
+
+
+int main() {
+    {
+        // Initialisations
+        Mounts mounts;
+
+        // Print memory usage
+        cout << "Total: " << get_mem::total() / 1000000 << " MB" << endl
+             << "Used: " << get_mem::used() / 1000000 << " MB" << endl
+             << "Free: " << get_mem::free() / 1000000 << " MB" << endl;
+    }
+
+    while (1);
+}

utils/compile.sh

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+#! /bin/sh
+
+
+# Config
+C="c++"
+CFLAGS="-std=c++17 -static -O3 -I../include"
+
+# Init env
+cd src
+
+# Clean up old executables
+rm -f ../bin/*
+
+# Compile executables
+cd ../src
+outfile="../bin/main"
+"$C" $CFLAGS *.cpp -o "$outfile" || exit

utils/genimg.sh

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+#! /bin/sh
+cd bin
+ls ./* | cpio -ov -H newc -R 0 --no-absolute-filenames > ../initramfs.cpio || exit
+cd ..
+gzip -f initramfs.cpio