Signed-off-by: Peter Lieven <[email protected]>
---
include/qemu/mmap-alloc.h | 6 ++++++
util/mmap-alloc.c | 17 +++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h
index 0899b2f..a457721 100644
--- a/include/qemu/mmap-alloc.h
+++ b/include/qemu/mmap-alloc.h
@@ -9,4 +9,10 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool
shared);
void qemu_ram_munmap(void *ptr, size_t size);
+/* qemu_anon_ram_mmap maps private anonymous memory using mmap and
+ * aborts if the allocation fails. its meant to act as an replacement
+ * for g_malloc0 and friends. */
+void *qemu_anon_ram_mmap(size_t size);
+void qemu_anon_ram_munmap(void *ptr, size_t size);
+
#endif
diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c
index 629d97a..c099858 100644
--- a/util/mmap-alloc.c
+++ b/util/mmap-alloc.c
@@ -107,3 +107,20 @@ void qemu_ram_munmap(void *ptr, size_t size)
munmap(ptr, size + getpagesize());
}
}
+
+void *qemu_anon_ram_mmap(size_t size)
+{
+ void *ptr = mmap(NULL, size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if (ptr == MAP_FAILED) {
+ abort();
+ }
+ return ptr;
+}
+
+void qemu_anon_ram_munmap(void *ptr, size_t size)
+{
+ if (ptr) {
+ munmap(ptr, size);
+ }
+}
--
1.9.1
