On 11/17/2012 04:44 PM, Yinghai Lu wrote: > On Sat, Nov 17, 2012 at 12:04 PM, Yinghai Lu <yinghai at kernel.org> wrote: >> On Sat, Nov 17, 2012 at 12:25 AM, Eric W. Biederman >> <ebiederm at xmission.com> wrote: >> >> then for setup data (boot param) and command line, we have to set extra ident >> mapping for them in kernel arch/x86/kernel/head_64.S >> > > find the solution for this one: > We don't need to set ident map for boot_param and command line in head_64.S > > as we already get arch/x86/kernel/head64.c, and could use > early_ioremap to access > and copy them out. > I don't think that is feasible; we need access to this structure extremely early. I think if you're using the 64-bit entry point it has to be an entry condition that those structures are mapped. It simply becomes a precondition for using the 64-bit entry point. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
