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pc64: implement checkmmu() debug function

--- a/sys/src/9/pc64/mmu.c

+++ b/sys/src/9/pc64/mmu.c

@@ -438,10 +438,19 @@

 		invlpg(va);

 }

+/*

+ * Double-check the user MMU.

+ * Error checking only.

+ */

 void

 checkmmu(uintptr va, uintptr pa)

 {

-	USED(va, pa);

+	uintptr *pte;

+

+	pte = mmuwalk(m->pml4, va, 0, 0);

+	if(pte != 0 && (*pte & PTEVALID) != 0 && PPN(*pte) != pa)

+		print("%ld %s: va=%#p pa=%#p pte=%#p\n",

+			up->pid, up->text, va, pa, *pte);

 }

 uintptr

-- 

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