Commit f97013fd authored Jun 25, 2008 by Jeremy Fitzhardinge Committed by Ingo Molnar Jul 08, 2008

x86, 64-bit: split x86_64_start_kernel



Split x86_64_start_kernel() into two pieces:

   The first essentially cleans up after head_64.S.  It clears the
   bss, zaps low identity mappings, sets up some early exception
   handlers.

   The second part preserves the boot data, reserves the kernel's
   text/data/bss, pagetables and ramdisk, and then starts the kernel
   proper.

This split is so that Xen can call the second part to do the set up it
needs done.  It doesn't need any of the first part setups, because it
doesn't boot via head_64.S, and its redundant or actively damaging.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 40801175

arch/x86/kernel/head64.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -108,6 +108,11 @@ void __init x86_64_start_kernel(char * real_mode_data)

		early_printk("Kernel really alive\n");

		x86_64_start_reservations(real_mode_data);
		}

		void __init x86_64_start_reservations(char *real_mode_data)
		{
		copy_bootdata(__va(real_mode_data));

		reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");

include/asm-x86/setup.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -58,6 +58,8 @@ extern unsigned long init_pg_tables_end;

		#else
		void __init x86_64_start_kernel(char *real_mode);
		void __init x86_64_start_reservations(char *real_mode_data);

		#endif /* __i386__ */
		#endif /* _SETUP */
		#endif /* __ASSEMBLY__ */

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