Removed NASM dependency.

README.md

@@ -7,7 +7,6 @@ A hobby OS written in Nim.
 * nim
 * nimble (* or use other nake install method)
 * clang
-* nasm
 * grub2
 * qemu
 

kernel/arch/i386/boot.s

@@ -1,31 +1,27 @@
-; http://wiki.osdev.org/Bare_Bones_with_NASM
-MBALIGN  equ  1<<0              ; align loaded modules on page boundaries
-MEMINFO  equ  1<<1              ; provide memory map
-FLAGS    equ  MBALIGN | MEMINFO ; this is the Multiboot 'flag' field
-MAGIC    equ  0x1BADB002        ; 'magic number' lets bootloader find the header
-CHECKSUM equ -(MAGIC + FLAGS)   ; checksum of above, to prove we are multiboot
+# http://wiki.osdev.org/Bare_Bones_with_NASM
+.set MBALIGN, 1<<0               # align loaded modules on page boundaries
+.set MEMINFO, 1<<1               # provide memory map
+.set FLAGS,   MBALIGN | MEMINFO  # this is the Multiboot 'flag' field
+.set MAGIC,   0x1BADB002         # 'magic number' lets bootloader find the header
+.set CHECKSUM,-(MAGIC + FLAGS)   # checksum of above, to prove we are multiboot
 
-section .multiboot
-align 4
-	dd MAGIC
-	dd FLAGS
-	dd CHECKSUM
+.section .multiboot
+.align 4
+.long MAGIC
+.long FLAGS
+.long CHECKSUM
 
-section .bss
-align 16
+.section .bss
 stack_bottom:
-resb 16384 ; 16 KiB
+.skip 16384 # 16 KiB
 stack_top:
 
-section .text
-global _start:function (_start.end - _start)
+.section .text
+.global _start
+.type _start, @function
 _start:
-
-	mov esp, stack_top
-
-	extern kernel_main
+	mov $stack_top, %esp
 	call kernel_main
-
 	cli
 .hang:	hlt
 	jmp .hang

nakefile.nim

@@ -17,7 +17,7 @@ task "clean", "Removes build files.":
 
 task "bootloader", "Builds the bootloader.":
   echo "Building bootloader."
-  direShell("nasm -felf32 kernel/arch/i386/boot.s -o boot.o")
+  direShell("clang -c --target=i386-pc-none-elf kernel/arch/i386/boot.s -o boot.o")
   echo "Done."
 
 task "build", "Builds the operating system.":