.global asm_usermode
.extern userfunc

# pass address to func to exec (TODO)
asm_usermode:

	// 0x23 is user data segment (|2 low bits)
	// 0x1b is user code segment (|2 low bits)

	// set segment registers
        mov $0x23, %ax
        mov %ax, %ds
        mov %ax, %es
        mov %ax, %fs
        mov %ax, %gs
	// ss is handled by iret
                 
        mov %esp, %eax

        pushl $0x23 // user data segment
        pushl %eax  // current stack
        pushf	    // 

        // http://x86.renejeschke.de/html/file_module_x86_id_145.html
        //mov $0x200, %eax
	//push %eax	    // eflags image
        pushl $0x1B	    // return code segment selector
        push $userfunc	    // return instruction pointer
        iret

	jmp . // will never be reached?