Initial landing of SMP support for FreeBSD/amd64.

- This is heavily derived from John Baldwin's apic/pci cleanup on i386.
- I have completely rewritten or drastically cleaned up some other parts.
  (in particular, bootstrap)
- This is still a WIP.  It seems that there are some highly bogus bioses
  on nVidia nForce3-150 boards.  I can't stress how broken these boards
  are.  I have a workaround in mind, but right now the Asus SK8N is broken.
  The Gigabyte K8NPro (nVidia based) is also mind-numbingly hosed.
- Most of my testing has been with SCHED_ULE.  SCHED_4BSD works.
- the apic and acpi components are 'standard'.
- If you have an nVidia nForce3-150 board, you are stuck with 'device
  atpic' in addition, because they somehow managed to forget to connect the
  8254 timer to the apic, even though its in the same silicon!  ARGH!
  This directly violates the ACPI spec.

1 files changed, 4 insertions, 0 deletions

diff --git a/sys/amd64/include/param.h b/sys/amd64/include/param.h
index 293f909eb150..7c3a831cdbf1 100644
--- a/sys/amd64/include/param.h
+++ b/sys/amd64/include/param.h
@@ -83,7 +83,11 @@
 #define	MACHINE_ARCH	"amd64"
 #endif
 
+#ifdef SMP
+#define MAXCPU		8
+#else
 #define MAXCPU		1
+#endif
 
 #define	ALIGNBYTES		_ALIGNBYTES
 #define	ALIGN(p)		_ALIGN(p)