• Ricardo Neri's avatar
    x86/boot: Relocate definition of the initial state of CR0 · b0ce5b8c
    Ricardo Neri authored
    Both head_32.S and head_64.S utilize the same value to initialize the
    control register CR0. Also, other parts of the kernel might want to access
    this initial definition (e.g., emulation code for User-Mode Instruction
    Prevention uses this state to provide a sane dummy value for CR0 when
    emulating the smsw instruction). Thus, relocate this definition to a
    header file from which it can be conveniently accessed.
    Suggested-by: default avatarBorislav Petkov <bp@alien8.de>
    Signed-off-by: default avatarRicardo Neri <ricardo.neri-calderon@linux.intel.com>
    Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
    Reviewed-by: default avatarAndy Lutomirski <luto@kernel.org>
    Cc: "Michael S. Tsirkin" <mst@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: ricardo.neri@intel.com
    Cc: linux-mm@kvack.org
    Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
    Cc: Huang Rui <ray.huang@amd.com>
    Cc: Shuah Khan <shuah@kernel.org>
    Cc: linux-arch@vger.kernel.org
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Jiri Slaby <jslaby@suse.cz>
    Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Chris Metcalf <cmetcalf@mellanox.com>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Chen Yucong <slaoub@gmail.com>
    Cc: Vlastimil Babka <vbabka@suse.cz>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Masami Hiramatsu <mhiramat@kernel.org>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Link: https://lkml.kernel.org/r/1509135945-13762-3-git-send-email-ricardo.neri-calderon@linux.intel.com
    b0ce5b8c
head_64.S 11.7 KB