Init

.gitignore

@@ -0,0 +1,4 @@
+iso_root
+mop3.iso
+bochs-log.txt
+bochs-com1.txt

Makefile

@@ -0,0 +1,9 @@
+platform ?= amd64
+
+all_kernel:
+	make -C kernel platform=$(platform) all
+
+clean_kernel:
+	make -C kernel platform=$(platform) clean
+
+.PHONY: all_kernel clean_kernel

aux/bochs_amd64.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+bochs -f aux/bochsrc.txt -q

aux/bochsrc.txt

@@ -0,0 +1,21 @@
+cpu: model=p4_prescott_celeron_336
+
+memory: guest=4096 host=2048
+
+romimage: file=/usr/share/bochs/BIOS-bochs-latest, options=fastboot
+vgaromimage: file=/usr/share/bochs/VGABIOS-lgpl-latest.bin
+
+ata0: enabled=1
+ata0-master: type=cdrom, path=mop3.iso, status=inserted
+com1: enabled=1, mode=file, dev=bochs-com1.txt
+
+boot: cdrom
+
+error: action=report
+panic: action=report
+info: action=report
+debug: action=ignore
+
+log: bochs-log.txt
+
+display_library: x

aux/limine_iso_amd64.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+make -C boot/limine
+mkdir -p iso_root/boot/limine
+mkdir -p iso_root/EFI/BOOT
+
+cp -v kernel/build/kernel.elf iso_root/boot
+cp -v boot/limine/limine-bios.sys boot/limine/limine-bios-cd.bin \
+  boot/limine/limine-uefi-cd.bin boot/limine.conf iso_root/boot/limine
+
+cp -v boot/limine/BOOTX64.EFI boot/limine/BOOTIA32.EFI iso_root/EFI/BOOT
+
+xorriso -as mkisofs -R -r -J -b boot/limine/limine-bios-cd.bin \
+  -no-emul-boot -boot-load-size 4 -boot-info-table -hfsplus \
+  -apm-block-size 2048 --efi-boot boot/limine/limine-uefi-cd.bin \
+  -efi-boot-part --efi-boot-image --protective-msdos-label \
+  iso_root -o mop3.iso
+
+boot/limine/limine bios-install mop3.iso

boot/limine.conf

@@ -0,0 +1,5 @@
+timeout: 10
+
+/mop3
+  protocol: limine
+  path: boot():/boot/kernel.elf

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