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bcm64: use 64-bit uvlong physical address in vmap()

--- a/sys/src/9/bcm64/fns.h

+++ b/sys/src/9/bcm64/fns.h

@@ -68,7 +68,7 @@

 extern KMap *kmap(Page*);

 extern void kunmap(KMap*);

 extern uintptr mmukmap(uintptr, uintptr, usize);

-extern void* vmap(uintptr, int);

+extern void* vmap(uvlong, int);

 extern void vunmap(void*, int);

 extern void mmu0init(uintptr*);

--- a/sys/src/9/bcm64/mmu.c

+++ b/sys/src/9/bcm64/mmu.c

@@ -319,10 +319,10 @@

 }

 void*

-vmap(uintptr pa, int size)

+vmap(uvlong pa, int size)

 {

 	static uintptr base = VMAP;

-	uintptr pe = pa + size;

+	uvlong pe = pa + size;

 	uintptr va;

 	va = base;