• As discussed in
    http://lists.gnu.org/archive/html/qemu-devel/2008-08/msg00667.html,
    current pxe boot is broken for some use cases. The problem
    goes away if we reduce the number of allowed bits in the address space
    to 32 (which has the side effect of reducing guest max mem size to 4Gb).
    
    After digging for a while, it turns out that it happens because pxelinux
    tries to access address 0x10009e9a6, which does not fit a 32-bit address.
    A closer look, however, reveals this access is totally valid: It's just
    0x9e9a6 with an add carry.
    
    To avoid this, this patch casts the address passed to the POPL macro to
    a 32-bit value. This is also done, although just theorectically, for
    PUSHL too.
    
    Signed-off-by: Glauber Costa <glommer@redhat.com>
    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
    Reported-by: Chris Lalancette <clalance@redhat.com>
    CC: Eduardo Habkost <ehabkost@redhat.com>
    
    
    
    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5182 c046a42c-6fe2-441c-8c8c-71466251a162
    aliguori authored
     
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