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-rw-r--r--src/vppinfra/linux/mem.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/src/vppinfra/linux/mem.c b/src/vppinfra/linux/mem.c
index 3b7294f038a..d86402a9b16 100644
--- a/src/vppinfra/linux/mem.c
+++ b/src/vppinfra/linux/mem.c
@@ -344,6 +344,38 @@ clib_mem_vm_ext_free (clib_mem_vm_alloc_t * a)
}
}
+uword
+clib_mem_vm_reserve (uword start, uword size, u32 log2_page_sz)
+{
+ uword off, pagesize = 1 << log2_page_sz;
+ int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS;
+ u8 *p;
+
+ if (start)
+ mmap_flags |= MAP_FIXED;
+
+ size = round_pow2 (size, pagesize);
+
+ p = uword_to_pointer (start, void *);
+ p = mmap (p, size + pagesize, PROT_NONE, mmap_flags, -1, 0);
+
+ if (p == MAP_FAILED)
+ return ~0;
+
+ off = round_pow2 ((uword) p, pagesize) - (uword) p;
+
+ /* trim start and end of reservation to be page aligned */
+ if (off)
+ {
+ munmap (p, off);
+ p += off;
+ }
+
+ munmap (p + size, pagesize - off);
+
+ return (uword) p;
+}
+
u64 *
clib_mem_vm_get_paddr (void *mem, int log2_page_size, int n_pages)
{