qemu_ram_ptr_length: take ram_addr_t as arguments

qemu_ram_ptr_length should take ram_addr_t as argument rather than
target_phys_addr_t because is doing comparisons with RAMBlock addresses.

cpu_physical_memory_map should create a ram_addr_t address to pass to
qemu_ram_ptr_length from PhysPageDesc phys_offset.

Remove code after abort() in qemu_ram_ptr_length.

Changes in v2:

- handle 0 size in qemu_ram_ptr_length;

- rename addr1 to raddr;

- initialize raddr to ULONG_MAX.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/cpu-common.h b/cpu-common.h
index c6a2b5f..a5b80e1 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -65,7 +65,7 @@
 void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
 /* This should only be used for ram local to a device.  */
 void *qemu_get_ram_ptr(ram_addr_t addr);
-void *qemu_ram_ptr_length(target_phys_addr_t addr, target_phys_addr_t *size);
+void *qemu_ram_ptr_length(ram_addr_t addr, ram_addr_t *size);
 /* Same but slower, to use for migration, where the order of
  * RAMBlocks must not change. */
 void *qemu_safe_ram_ptr(ram_addr_t addr);