svn commit: r223377 - head/sys/sparc64/sparc64

[Marius Strobl]

Author: marius
Date: Tue Jun 21 20:47:03 2011
New Revision: 223377
URL: http://svn.freebsd.org/changeset/base/223377

Log:
  On machines where we don't need to lock the kernel TSB into the dTLB and
  thus may basically use the entire 64-bit kernel address space increase
  the kernel virtual memory to not be limited by VM_KMEM_SIZE_MAX.

Modified:
  head/sys/sparc64/sparc64/pmap.c

Modified: head/sys/sparc64/sparc64/pmap.c
==============================================================================
--- head/sys/sparc64/sparc64/pmap.c	Tue Jun 21 20:44:06 2011	(r223376)
+++ head/sys/sparc64/sparc64/pmap.c	Tue Jun 21 20:47:03 2011	(r223377)
@@ -384,11 +384,12 @@ pmap_bootstrap(u_int cpu_impl)
 	 * public documentation is available for these, the latter just might
 	 * not support it, yet.
 	 */
-	virtsz = roundup(physsz, PAGE_SIZE_4M << (PAGE_SHIFT - TTE_SHIFT));
 	if (cpu_impl == CPU_IMPL_SPARC64V ||
-	    cpu_impl >= CPU_IMPL_ULTRASPARCIIIp)
+	    cpu_impl >= CPU_IMPL_ULTRASPARCIIIp) {
 		tsb_kernel_ldd_phys = 1;
-	else {
+		virtsz = roundup(5 / 3 * physsz, PAGE_SIZE_4M <<
+		    (PAGE_SHIFT - TTE_SHIFT));
+	} else {
 		dtlb_slots_avail = 0;
 		for (i = 0; i < dtlb_slots; i++) {
 			data = dtlb_get_data(i);
@@ -401,6 +402,8 @@ pmap_bootstrap(u_int cpu_impl)
 		if (cpu_impl >= CPU_IMPL_ULTRASPARCI &&
 		    cpu_impl < CPU_IMPL_ULTRASPARCIII)
 			dtlb_slots_avail /= 2;
+		virtsz = roundup(physsz, PAGE_SIZE_4M <<
+		    (PAGE_SHIFT - TTE_SHIFT));
 		virtsz = MIN(virtsz, (dtlb_slots_avail * PAGE_SIZE_4M) <<
 		    (PAGE_SHIFT - TTE_SHIFT));
 	}