• Vivek Goyal's avatar
    [PATCH] x86-64: Remove the identity mapping as early as possible · cfd243d4
    Vivek Goyal authored
    With the rewrite of the SMP trampoline and the early page
    allocator there is nothing that needs identity mapped pages,
    once we start executing C code.
    
    So add zap_identity_mappings into head64.c and remove
    zap_low_mappings() from much later in the code.  The functions
     are subtly different thus the name change.
    
    This also kills boot_level4_pgt which was from an earlier
    attempt to move the identity mappings as early as possible,
    and is now no longer needed.  Essentially I have replaced
    boot_level4_pgt with trampoline_level4_pgt in trampoline.S
    Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
    Signed-off-by: default avatarVivek Goyal <vgoyal@in.ibm.com>
    Signed-off-by: default avatarAndi Kleen <ak@suse.de>
    cfd243d4
head.S 9.28 KB