On Mon, Mar 13, 2017 at 08:18:10AM +0100, Ingo Molnar wrote: > > * Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> wrote: > > > This patch adds support for 5-level paging during early boot. > > It generalizes boot for 4- and 5-level paging on 64-bit systems with > > compile-time switch between them. > > > > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> > > --- > > arch/x86/boot/compressed/head_64.S | 23 +++++++++-- > > arch/x86/include/asm/pgtable.h | 2 +- > > arch/x86/include/asm/pgtable_64.h | 6 ++- > > arch/x86/include/uapi/asm/processor-flags.h | 2 + > > arch/x86/kernel/espfix_64.c | 2 +- > > arch/x86/kernel/head64.c | 40 +++++++++++++----- > > arch/x86/kernel/head_64.S | 63 +++++++++++++++++++++-------- > > Ok, here I'd like to have a C version instead of further complicating an already > complex assembly version... Just head up: I work on this. It's great deal of frustration (I can't really read assembly), but I'm slowly moving forward. Most of logic in startup_64 in arch/x86/kernel/head_64.S is converted to C. Dealing with secondary_startup_64 now. Not sure if it's possible to convert code in arch/x86/boot/compressed/head_64.S to C. Assembly code there is in 32-bit mode, but if we move it to C it will compiled as 64-bit. I've tried to put it in separate translation unit and compile with -m32, but then link phase breaks as object files have different types. Any suggestion how I can get out of the situation? -- Kirill A. Shutemov
