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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>
This commit is contained in:
Jeremy Fitzhardinge 2008-06-25 00:19:18 -04:00 committed by Ingo Molnar
parent 408011759c
commit f97013fd8f
2 changed files with 7 additions and 0 deletions
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5
arch/x86/kernel/head64.c
View File

@ -108,6 +108,11 @@ void __init x86_64_start_kernel(char * real_mode_data)
early_printk("Kernel really alive\n"); 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)); copy_bootdata(__va(real_mode_data));
reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS"); reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");

2
include/asm-x86/setup.h
View File

@ -58,6 +58,8 @@ extern unsigned long init_pg_tables_end;
#else #else
void __init x86_64_start_kernel(char *real_mode); void __init x86_64_start_kernel(char *real_mode);
void __init x86_64_start_reservations(char *real_mode_data);
#endif /* __i386__ */ #endif /* __i386__ */
#endif /* _SETUP */ #endif /* _SETUP */
#endif /* __ASSEMBLY__ */ #endif /* __ASSEMBLY__ */