Add kmem_valloc

Functions like vremap need to allocate some virtual addressing space
before making their own mapping. kmem_alloc_wired can be used for that
but that wastes memory.

* vm/vm_kern.c (kmem_valloc): New function.
* vm/vm_kern.h (kmem_valloc): New prototype.
* linux/dev/glue/kmem.c (vremap): Call kmem_valloc instead of
kmem_alloc_wired. Also check that `offset' is aligned on a page.

1 files changed, 3 insertions, 1 deletions

diff --git a/linux/dev/glue/kmem.c b/linux/dev/glue/kmem.c
index 8e0b5425..509229d1 100644
--- a/linux/dev/glue/kmem.c
+++ b/linux/dev/glue/kmem.c
@@ -574,8 +574,10 @@ vremap (unsigned long offset, unsigned long size)
 {
   vm_offset_t addr;
   kern_return_t ret;
+
+  assert(page_aligned(offset));
   
-  ret = kmem_alloc_wired (kernel_map, &addr, round_page (size));
+  ret = kmem_valloc (kernel_map, &addr, round_page (size));
   if (ret != KERN_SUCCESS)
     return NULL;