barebones kernel.cpp complete

Author: syedtaqi95

Makefile

@@ -1,11 +1,13 @@
-# Use g++ i686 Cross Compiler
+# Use the i686 Cross Compiler
 GCC_FOLDER = ~/GCC_SRC
 C = $(GCC_FOLDER)/bin/i686-elf-gcc
+CXX = $(GCC_FOLDER)/bin/i686-elf-g++
 AS = $(GCC_FOLDER)/bin/i686-elf-as
-LD = $(C)
+LD = $(CXX)
 
 # Compiler flags
 C_FLAGS = -std=gnu99 -ffreestanding -O2 -Wall -Wextra -v
+CXX_FLAGS = -ffreestanding -O2 -Wall -Wextra -fno-exceptions -fno-rtti
 LD_FLAGS = -ffreestanding -O2 -nostdlib -lgcc
 
 # Objects
@@ -18,24 +20,26 @@ objects = boot.o kernel.o
 %.o : %.c
 	$(C) -o $@ -c $< $(C_FLAGS)
 
-myos.bin: linker.ld $(objects)
+%.o : %.cpp
+	$(CXX) -o $@ -c $< $(CXX_FLAGS)
+
+custom-os.bin: linker.ld $(objects)
 	$(LD) -T $< -o $@ $(LD_FLAGS) $(objects)
-	# i686-elf-gcc -T linker.ld -o myos.bin -ffreestanding -O2 -nostdlib boot.o kernel.o -lgcc
 
-install: myos.bin
+install: custom-os.bin
 	mkdir -p isodir/boot/grub
-	cp myos.bin isodir/boot/myos.bin
+	cp custom-os.bin isodir/boot/custom-os.bin
 	echo 'set timeout=0'                      > isodir/boot/grub/grub.cfg
 	echo 'set default=0'                     >> isodir/boot/grub/grub.cfg
 	echo ''                                  >> isodir/boot/grub/grub.cfg
 	echo 'menuentry "My Operating System" {' >> isodir/boot/grub/grub.cfg
-	echo '  multiboot /boot/myos.bin'    >> isodir/boot/grub/grub.cfg
+	echo '  multiboot /boot/custom-os.bin'    >> isodir/boot/grub/grub.cfg
 	echo '}'                                 >> isodir/boot/grub/grub.cfg
-	grub-mkrescue -o myos.iso isodir
+	grub-mkrescue -o custom-os.iso isodir
 	rm -rf isodir
 
 clean:
-	rm -f $(objects) myos.bin myos.iso isodir
+	rm -f $(objects) custom-os.bin custom-os.iso isodir
 
 run:
-	qemu-system-i386 -cdrom myos.iso
+	qemu-system-i386 -cdrom custom-os.iso

kernel.c

@@ -81,6 +81,44 @@ void terminal_initialize(void)
 	}
 }
 
+void terminal_setcolor(uint8_t color) 
+{
+	terminal_color = color;
+}
+ 
+void terminal_putentryat(char c, uint8_t color, size_t x, size_t y) 
+{
+	const size_t index = y * VGA_WIDTH + x;
+	terminal_buffer[index] = vga_entry(c, color);
+}
+ 
+void terminal_putchar(char c) 
+{
+	if (c == '\n') {
+		terminal_row++;
+		terminal_column = 0;
+	}
+	else {
+		terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
+		if (++terminal_column == VGA_WIDTH) {
+			terminal_column = 0;
+			if (++terminal_row == VGA_HEIGHT)
+				terminal_row = 0;
+		}
+	}	
+}
+ 
+void terminal_write(const char* data, size_t size) 
+{
+	for (size_t i = 0; i < size; i++)
+		terminal_putchar(data[i]);
+}
+ 
+void terminal_writestring(const char* data) 
+{
+	terminal_write(data, strlen(data));
+}
+
 // kernel main function called by loader.s
 extern "C" void kernel_main(void) 
 {