D42788.id130649.diff
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D42788.id130649.diff
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	diff --git a/sys/vm/vm_extern.h b/sys/vm/vm_extern.h
	--- a/sys/vm/vm_extern.h
	+++ b/sys/vm/vm_extern.h
	@@ -49,6 +49,7 @@

	/* These operate on kernel virtual addresses only. */
	vm_offset_t kva_alloc(vm_size_t);
	+vm_offset_t kva_alloc_aligned(vm_size_t, vm_size_t);
	void kva_free(vm_offset_t, vm_size_t);

	/* These operate on pageable virtual addresses. */
	diff --git a/sys/vm/vm_kern.c b/sys/vm/vm_kern.c
	--- a/sys/vm/vm_kern.c
	+++ b/sys/vm/vm_kern.c
	@@ -156,6 +156,27 @@
	return (addr);
	}

	+/*
	+ * kva_alloc_aligned:
	+ *
	+ * Allocate a virtual address range as in kva_alloc where the base
	+ * address is aligned to align.
	+ */
	+vm_offset_t
	+kva_alloc_aligned(vm_size_t size, vm_size_t align)
	+{
	+ vm_offset_t addr;
	+
	+ TSENTER();
	+ size = round_page(size);
	+ if (vmem_alloc_aligned(kernel_arena, size, align, M_BESTFIT \| M_NOWAIT,
	+ &addr))
	+ return (0);
	+ TSEXIT();
	+
	+ return (addr);
	+}
	+
	/*
	* kva_free:
	*