#include "../kernel/kernel.h"

.global asm_usermode

asm_usermode:

	mov 0x4(%esp),%edx    //get adress of passed : void func()
			      //to be called in ring 3

	// 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 $VMEM_USER_STACK_TOP-4*32 //(3 values will be poped on _start) we subst 4 to align
        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 %edx	    // return instruction pointer

        iret

	jmp . // never to be reached