Init

kernel/Makefile

@@ -0,0 +1,26 @@
+cc := clang
+o :=
+c :=
+ldflags :=
+cflags  :=
+buildtype ?= release
+
+include $(platform)/src.mk
+include $(platform)/flags.mk
+include generic/flags.mk
+
+all: build/kernel.elf
+
+build/kernel.elf: $(o)
+	$(cc) -o $@ $(ldflags) -T $(platform)/link.ld $^
+
+%.o: %.c
+	$(cc) -c -o $@ $(cflags) $<
+
+%.o: %.S
+	$(cc) -c -o $@ $(cflags) $<
+
+clean:
+	rm -f $(o) build/kernel.elf
+
+.PHONY: all clean

kernel/amd64/.gitignore

@@ -0,0 +1 @@
+*.o

kernel/amd64/bootmain.c

@@ -0,0 +1,4 @@
+
+void bootmain(void) {
+  for (;;);
+}

kernel/amd64/flags.mk

@@ -0,0 +1,3 @@
+cflags += --target=x86_64-pc-none-elf
+
+ldflags += --target=x86_64-pc-none-elf

kernel/amd64/link.ld

@@ -0,0 +1,51 @@
+OUTPUT_FORMAT(elf64-x86-64)
+
+ENTRY(bootmain)
+
+PHDRS {
+  limine_requests PT_LOAD;
+  text PT_LOAD;
+  rodata PT_LOAD;
+  data PT_LOAD;
+}
+
+SECTIONS {
+  . = 0xffffffff80000000;
+
+  .limine_requests : {
+    KEEP(*(.limine_requests_start))
+    KEEP(*(.limine_requests))
+    KEEP(*(.limine_requests_end))
+  } :limine_requests
+
+  . = ALIGN(CONSTANT(MAXPAGESIZE));
+
+  .text : {
+    *(.text .text.*)
+  } :text
+
+  . = ALIGN(CONSTANT(MAXPAGESIZE));
+
+  .rodata : {
+    *(.rodata .rodata.*)
+  } :rodata
+
+  .note.gnu.build-id : {
+    *(.note.gnu.build-id)
+  } :rodata
+  
+  . = ALIGN(CONSTANT(MAXPAGESIZE));
+
+  .data : {
+    *(.data .data.*)
+  } :data
+
+  .bss : {
+    *(.bss .bss.*)
+  } :data
+
+  /DISCARD/ : {
+    *(.eh_frame*)
+    *(.note .note.*)
+  }
+}

kernel/amd64/src.mk

@@ -0,0 +1,3 @@
+c += amd64/bootmain.c
+
+o += amd64/bootmain.o

kernel/generic/flags.mk

@@ -0,0 +1,32 @@
+cflags += -nostdinc \
+					-nostdlib \
+					-ffreestanding \
+					-fno-builtin \
+					-std=c11 \
+					-pedantic \
+					-Wall \
+					-Wextra
+
+ifeq ($(buildtype),debug)
+	cflags += -O0 -g
+endif
+
+ifeq ($(buildtype),release)
+	cflags += -ffunction-sections -fdata-sections -Oz
+endif
+
+ldflags += -ffreestanding \
+					 -nostdlib \
+					 -fno-builtin \
+					 -fuse-ld=lld \
+					 -static
+
+ifeq ($(buildtype),debug)
+	ldflags += -g
+endif
+
+ifeq ($(buildtype),release)
+	ldflags += -Wl,--gc-sections \
+						 -Wl,--strip-all \
+						 -flto
+endif