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>
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@ -108,6 +108,11 @@ void __init x86_64_start_kernel(char * real_mode_data)
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early_printk("Kernel really alive\n");
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x86_64_start_reservations(real_mode_data);
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}
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void __init x86_64_start_reservations(char *real_mode_data)
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{
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copy_bootdata(__va(real_mode_data));
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reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");
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@ -58,6 +58,8 @@ extern unsigned long init_pg_tables_end;
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#else
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void __init x86_64_start_kernel(char *real_mode);
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void __init x86_64_start_reservations(char *real_mode_data);
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#endif /* __i386__ */
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#endif /* _SETUP */
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#endif /* __ASSEMBLY__ */
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