kernel

Makefile

@@ -1,13 +1,14 @@
 
-OSNAME = CustomOS
+OSNAME = zugiOS
 
 GNUEFI = ../gnu-efi
 OVMFDIR = ../OVMFbin
-LDS = 
-CC = x86_64-w64-mingw32-gcc
+LDS = kernel.ld
+CC = gcc
+LD = ld
 
 CFLAGS = -ffreestanding -fshort-wchar
-LDFLAGS = -T $(LDS) -shared -Bsymbolic -nostdlib
+LDFLAGS = -T $(LDS) -static -no-pie -Bsymbolic -nostdlib
 
 SRCDIR := src
 OBJDIR := lib
@@ -20,6 +21,17 @@ SRC = $(call rwildcard,$(SRCDIR),*.c)
 OBJS = $(patsubst $(SRCDIR)/%.c, $(OBJDIR)/%.o, $(SRC))
 DIRS = $(wildcard $(SRCDIR)/*)
 
+kernel: $(OBJS) link
+
+$(OBJDIR)/%.o: $(SRCDIR)/%.c
+	@ echo !==== COMPILING $^
+	@ mkdir -p $(@D)
+	$(CC) $(CFLAGS) -c $^ -o $@
+
+link:
+	@ echo !==== LINKING
+	$(LD) $(LDFLAGS) -o $(BUILDDIR)/kernel.elf $(OBJS)
+
 setup:
 	@mkdir $(BUILDDIR)
 	@mkdir $(SRCDIR)
@@ -32,6 +44,8 @@ buildimg:
 	mmd -i $(BUILDDIR)/$(OSNAME).img ::/EFI/BOOT
 	mcopy -i $(BUILDDIR)/$(OSNAME).img $(BOOTEFI) ::/EFI/BOOT
 	mcopy -i $(BUILDDIR)/$(OSNAME).img startup.nsh ::
+	mcopy -i $(BUILDDIR)/$(OSNAME).img $(BUILDDIR)/kernel.elf ::
+	mcopy -i $(BUILDDIR)/$(OSNAME).img $(BUILDDIR)/zap-vga16.psf ::
 
 run:
 	qemu-system-x86_64 -drive file=$(BUILDDIR)/$(OSNAME).img -m 256M -cpu qemu64 -drive if=pflash,format=raw,unit=0,file="$(OVMFDIR)/OVMF_CODE-pure-efi.fd",readonly=on -drive if=pflash,format=raw,unit=1,file="$(OVMFDIR)/OVMF_VARS-pure-efi.fd" -net none

kernel.ld

@@ -0,0 +1,23 @@
+OUTPUT_FORMAT(elf64-x86-64)
+ENTRY(_start)
+
+SECTIONS
+{
+    .text : ALIGN(0x100)
+    {
+        *(.text)
+    }
+    .data : ALIGN(0x100)
+    {
+        *(.data)
+    }
+    .rodata : ALIGN(0x100)
+    {
+        *(.rodata)
+    }
+    .bss : ALIGN(0x100)
+    {
+        *(COMMON)
+        *(.bss)
+    }
+}

run.bat

@@ -1,4 +1,4 @@
-set OSNAME=CustomOS
+set OSNAME=zugiOS
 set BUILDDIR=%0/../bin
 set OVMFDIR=%0/../../OVMFbin
 

src/kernel.c

@@ -0,0 +1,21 @@
+
+#include <stddef.h>
+#include <stdint.h>
+
+typedef struct {
+	void* BaseAddress;
+	size_t BufferSize;
+	unsigned int Width;
+	unsigned int Height;
+	unsigned int PixelsPerScanLine;
+} Framebuffer;
+
+void _start(Framebuffer* framebuffer){
+    unsigned int y = 50;
+	unsigned int B8P = 4;
+
+	for(unsigned int x = 0; x < framebuffer->Width / 2 * B8P; x+=B8P){
+		*(unsigned int*)(x + (y * framebuffer->PixelsPerScanLine * B8P) + framebuffer->BaseAddress) = 0xff00ffff;
+	}
+    return;
+}