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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 10 Dec 2012 05:14:35 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r244077 - head/sys/amd64/amd64
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Author: kib
Date: Mon Dec 10 05:14:34 2012
New Revision: 244077
URL: http://svnweb.freebsd.org/changeset/base/244077

Log:
  Add amd64-specific ddb command "show pte".  The command displays the
  hierarchy of the page table entries which map the specified address.
  
  Reviewed by:	alc (previous version)
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/amd64/amd64/pmap.c

Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c	Mon Dec 10 05:14:04 2012	(r244076)
+++ head/sys/amd64/amd64/pmap.c	Mon Dec 10 05:14:34 2012	(r244077)
@@ -5446,3 +5446,46 @@ pmap_align_superpage(vm_object_t object,
 	else
 		*addr = ((*addr + PDRMASK) & ~PDRMASK) + superpage_offset;
 }
+
+#include "opt_ddb.h"
+#ifdef DDB
+#include <ddb/ddb.h>
+
+DB_SHOW_COMMAND(pte, pmap_print_pte)
+{
+	pmap_t pmap;
+	pml4_entry_t *pml4;
+	pdp_entry_t *pdp;
+	pd_entry_t *pde;
+	pt_entry_t *pte;
+	vm_offset_t va;
+
+	if (have_addr) {
+		va = (vm_offset_t)addr;
+		pmap = PCPU_GET(curpmap); /* XXX */
+	} else {
+		db_printf("show pte addr\n");
+		return;
+	}
+	pml4 = pmap_pml4e(pmap, va);
+	db_printf("VA %#016lx pml4e %#016lx", va, *pml4);
+	if ((*pml4 & PG_V) == 0) {
+		db_printf("\n");
+		return;
+	}
+	pdp = pmap_pml4e_to_pdpe(pml4, va);
+	db_printf(" pdpe %#016lx", *pdp);
+	if ((*pdp & PG_V) == 0 || (*pdp & PG_PS) != 0) {
+		db_printf("\n");
+		return;
+	}
+	pde = pmap_pdpe_to_pde(pdp, va);
+	db_printf(" pde %#016lx", *pde);
+	if ((*pde & PG_V) == 0 || (*pde & PG_PS) != 0) {
+		db_printf("\n");
+		return;
+	}
+	pte = pmap_pde_to_pte(pde, va);
+	db_printf(" pte %#016lx\n", *pte);
+}
+#endif