• Stefan Agner's avatar
    ARM: 8415/1: early fixmap support for earlycon · a5f4c561
    Stefan Agner authored
    Add early fixmap support, initially to support permanent, fixed
    mapping support for early console. A temporary, early pte is
    created which is migrated to a permanent mapping in paging_init.
    This is also needed since the attributes may change as the memory
    types are initialized. The 3MiB range of fixmap spans two pte
    tables, but currently only one pte is created for early fixmap
    support.
    
    Re-add FIX_KMAP_BEGIN to the index calculation in highmem.c since
    the index for kmap does not start at zero anymore. This reverts
    4221e2e6 ("ARM: 8031/1: fixmap: remove FIX_KMAP_BEGIN and
    FIX_KMAP_END") to some extent.
    
    Cc: Mark Salter <msalter@redhat.com>
    Cc: Kees Cook <keescook@chromium.org>
    Cc: Laura Abbott <lauraa@codeaurora.org>
    Cc: Arnd Bergmann <arnd@arndb.de>
    Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Signed-off-by: default avatarRob Herring <robh@kernel.org>
    Signed-off-by: default avatarStefan Agner <stefan@agner.ch>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    a5f4c561
highmem.c 3.63 KB