PERFORCE change 31672 for review

[Peter Wemm]

http://perforce.freebsd.org/chv.cgi?CH=31672

Change 31672 by peter at peter_hammer on 2003/05/22 20:47:07

	move the recursive pml4 slot to the bottom of the negative
	address space, to leave all 256 positive slots for userland, for
	a total of 128TB of user space.  I haven't increased NUPML4E though
	because I'm not sure how the 'unsigned pindex' stuff is going
	to go, and haven't investigated the vm_page_t hold_count stuff
	for the page table pages.  It should be save to increase it from
	1 to 2 though, thats 1TB of user VM space.  That should be enough
	for a 'beta' release :-)

Affected files ...

.. //depot/projects/hammer/sys/amd64/include/pmap.h#9 edit
.. //depot/projects/hammer/sys/amd64/include/vmparam.h#8 edit

Differences ...

==== //depot/projects/hammer/sys/amd64/include/pmap.h#9 (text+ko) ====

@@ -113,7 +113,7 @@
 /*
  * The *PDI values control the layout of virtual memory
  */
-#define	PML4PML4I	1
+#define	PML4PML4I	(NPML4EPG/2)	/* Index of recursive pml4 mapping */
 
 #define	KPML4I		(NPML4EPG-1)
 #define DMPML4I		(KPML4I-1)

==== //depot/projects/hammer/sys/amd64/include/vmparam.h#8 (text+ko) ====

@@ -103,7 +103,7 @@
 #define	UPT_MAX_ADDRESS		VADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
 #define	UPT_MIN_ADDRESS		VADDR(PML4PML4I, 0, 0, 0)
 
-#define	VM_MAXUSER_ADDRESS	UPT_MIN_ADDRESS
+#define	VM_MAXUSER_ADDRESS	VADDR(NUPML4E, 0, 0, 0)
 
 #define	USRSTACK		VM_MAXUSER_ADDRESS