.code32
.global yield 
.extern schedule_next_task 
yield: # void yield()
    cli

    pushfl          
    pushl %cs

    movl 8(%esp), %eax      
    pushl %eax

    movl 4(%esp), %ebx      # Get CS
    movl %ebx, 8(%esp)      # Move CS over Old EIP
    movl 0(%esp), %ebx      # Get Return EIP
    movl %ebx, 4(%esp)      # Move Return EIP over CS
    addl $4, %esp           # Adjust stack pointer up.

    # the stack now looks like a hardware interrupt just happened, even though we never called one.

    pushal
    
    pushl %esp
    call switch_context
    movl %eax, %esp

    popal
    sti
    iret