diff --git a/drivers/gpu/nvgpu/Makefile.sources b/drivers/gpu/nvgpu/Makefile.sources
index 97c59c2e6..6142d8272 100644
--- a/drivers/gpu/nvgpu/Makefile.sources
+++ b/drivers/gpu/nvgpu/Makefile.sources
@@ -45,6 +45,7 @@ srcs :=	os/posix/nvgpu.c \
 	os/posix/lock.c \
 	os/posix/stubs.c \
 	os/posix/posix-fault-injection.c \
+	os/posix/posix-sim.c \
 	common/init/nvgpu_init.c \
 	common/mm/allocators/nvgpu_allocator.c \
 	common/mm/allocators/bitmap_allocator.c \
diff --git a/drivers/gpu/nvgpu/include/nvgpu/linux/sim.h b/drivers/gpu/nvgpu/include/nvgpu/linux/sim.h
index 99c6348b6..8fc4b7054 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/linux/sim.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/linux/sim.h
@@ -29,9 +29,6 @@ struct sim_nvgpu_linux {
 	void (*remove_support_linux)(struct gk20a *g);
 };
 
-void sim_writel(struct sim_nvgpu *sim, u32 r, u32 v);
-u32 sim_readl(struct sim_nvgpu *sim, u32 r);
-
 int nvgpu_init_sim_support_linux(struct gk20a *g,
 		struct platform_device *dev);
 void nvgpu_remove_sim_support_linux(struct gk20a *g);
diff --git a/drivers/gpu/nvgpu/include/nvgpu/sim.h b/drivers/gpu/nvgpu/include/nvgpu/sim.h
index 071fd95c4..0f0af38d1 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/sim.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/sim.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2018-2019, NVIDIA CORPORATION.  All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -54,5 +54,7 @@ int nvgpu_alloc_sim_buffer(struct gk20a *g, struct nvgpu_mem *mem);
 void nvgpu_free_sim_buffer(struct gk20a *g, struct nvgpu_mem *mem);
 void nvgpu_free_sim_support(struct gk20a *g);
 void nvgpu_remove_sim_support(struct gk20a *g);
+void sim_writel(struct sim_nvgpu *sim, u32 r, u32 v);
+u32 sim_readl(struct sim_nvgpu *sim, u32 r);
 
 #endif /* NVGPU_SIM_H */
diff --git a/drivers/gpu/nvgpu/os/posix/posix-sim.c b/drivers/gpu/nvgpu/os/posix/posix-sim.c
new file mode 100644
index 000000000..626ac8787
--- /dev/null
+++ b/drivers/gpu/nvgpu/os/posix/posix-sim.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/sim.h>
+#include <nvgpu/bug.h>
+
+void sim_writel(struct sim_nvgpu *sim, u32 r, u32 v)
+{
+	BUG();
+}
+
+u32 sim_readl(struct sim_nvgpu *sim, u32 r)
+{
+	BUG();
+	return 0;
+}