Commit fea24e28 authored May 14, 2010 by Jacob Pan Committed by H. Peter Anvin May 16, 2010

x86, mrst: add nop functions to x86_init mpparse functions



Moorestown does not have BIOS provided MP tables, we can save some time
by avoiding scaning of these tables. e.g.
[    0.000000] Scan SMP from c0000000 for 1024 bytes.
[    0.000000] Scan SMP from c009fc00 for 1024 bytes.
[    0.000000] Scan SMP from c00f0000 for 65536 bytes.
[    0.000000] Scan SMP from c00bfff0 for 1024 bytes.

Searching EBDA with the base at 0x40E will also result in random pointer
deferencing within 1MB. This can be a problem in Lincroft if the pointer
hits VGA area and VGA mode is not enabled.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
LKML-Reference: <1273873281-17489-8-git-send-email-jacob.jun.pan@linux.intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

parent e4af4268

arch/x86/kernel/mrst.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -237,4 +237,9 @@ void __init x86_mrst_early_setup(void)
		x86_init.pci.fixup_irqs = x86_init_noop;

		legacy_pic = &null_legacy_pic;

		/* Avoid searching for BIOS MP tables */
		x86_init.mpparse.find_smp_config = x86_init_noop;
		x86_init.mpparse.get_smp_config = x86_init_uint_noop;

		}

Admin message