diff --git a/services/server/env/fuchsia/km_apphint.cc b/services/server/env/fuchsia/km_apphint.cc
index ef48dcc..7d09a96 100644
--- a/services/server/env/fuchsia/km_apphint.cc
+++ b/services/server/env/fuchsia/km_apphint.cc
@@ -29,10 +29,15 @@
 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */ /**************************************************************************/
 
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "magma_util/macros.h"
+
 extern "C" {
 /* Common and SO layer */
 #include "img_defs.h"
-//#include "sofunc_pvr.h"
 
 /* for action device access */
 #include "pvrsrv.h"
@@ -42,77 +47,120 @@
 
 #include "km_apphint_defs.h"
 #include "km_apphint.h"
-}
 
-#define NOT_IMPLEMENTED() fprintf(stderr, "msd-img-rgx-mtk: Not implemented in %s:%s:%d\n", __func__, __FILE__, __LINE__);
+#include "htbuffer_sf.h"
+#include "htbuffer_types.h"
+}
 
 /*
 *******************************************************************************
- Public interface
+ Data types
 ******************************************************************************/
+union apphint_value {
+	IMG_UINT64 UINT64;
+	IMG_UINT32 UINT32;
+	bool BOOL;
+	const IMG_CHAR *STRING;
+};
+
+struct apphint_action
+{
+	union apphint_value stored;
+};
+
+/*
+ *******************************************************************************
+  Global state
+ ******************************************************************************/
+static struct apphint_state
+{
+	struct apphint_action val[APPHINT_ID_MAX];
+
+} apphint = {
+/* statically initialise default values to ensure that any module_params
+ * provided on the command line are not overwritten by defaults.
+ */
+	.val =
+		{
+#define UINT32Bitfield UINT32
+#define UINT32List UINT32
+#define X(a, b, c, d, e) { { .b = d } },
+			APPHINT_LIST_ALL
+#undef X
+#undef UINT32Bitfield
+#undef UINT32List
+		},
+};
+
+
+/*
+ *******************************************************************************
+  Public interface
+ ******************************************************************************/
 int
 pvr_apphint_init(void)
 {
-	NOT_IMPLEMENTED();
-	return -1;
+	return 0;
 }
 
 int
 pvr_apphint_device_register(PVRSRV_DEVICE_NODE *device)
 {
-	NOT_IMPLEMENTED();
-	return -1;
+	return 0;
 }
 
+
 void
 pvr_apphint_device_unregister(PVRSRV_DEVICE_NODE *device)
 {
-	NOT_IMPLEMENTED();
 }
 
 void
 pvr_apphint_deinit(void)
 {
-	NOT_IMPLEMENTED();
 }
 
 void
 pvr_apphint_dump_state(void)
 {
-	NOT_IMPLEMENTED();
 }
 
 int
-pvr_apphint_get_uint64(APPHINT_ID ue, IMG_UINT64 *pVal)
+pvr_apphint_get_uint64(APPHINT_ID apphint_id, IMG_UINT64 *pVal)
 {
-	NOT_IMPLEMENTED();
-	int error = -1;
-	return error;
+	DASSERT(apphint_id < APPHINT_ID_MAX);
+	*pVal = apphint.val[apphint_id].stored.UINT64;
+	return 0;
 }
 
 int
-pvr_apphint_get_uint32(APPHINT_ID ue, IMG_UINT32 *pVal)
+pvr_apphint_get_uint32(APPHINT_ID apphint_id, IMG_UINT32 *pVal)
 {
-	NOT_IMPLEMENTED();
-	int error = -1;
-	return error;
+	DASSERT(apphint_id < APPHINT_ID_MAX);
+	*pVal = apphint.val[apphint_id].stored.UINT32;
+	return 0;
 }
 
 int
-pvr_apphint_get_bool(APPHINT_ID ue, IMG_BOOL *pVal)
+pvr_apphint_get_bool(APPHINT_ID apphint_id, IMG_BOOL *pVal)
 {
-	NOT_IMPLEMENTED();
-	int error = -1;
-
-	return error;
+	DASSERT(apphint_id < APPHINT_ID_MAX);
+	*pVal = (IMG_BOOL)apphint.val[apphint_id].stored.BOOL;
+	return 0;
 }
 
 int
-pvr_apphint_get_string(APPHINT_ID ue, IMG_CHAR *pBuffer, size_t size)
+pvr_apphint_get_string(APPHINT_ID apphint_id, IMG_CHAR *pBuffer, size_t size)
 {
-	NOT_IMPLEMENTED();
-	int error = -1;
-
+	DASSERT(apphint_id < APPHINT_ID_MAX);
+	int error = -ERANGE;
+	if (apphint.val[apphint_id].stored.STRING)
+	{
+		if (strlcpy(pBuffer, apphint.val[apphint_id].stored.STRING, size) < size)
+		{
+			error = 0;
+		}
+	}
 	return error;
 }
 
@@ -124,7 +172,9 @@
 	const PVRSRV_DEVICE_NODE *device,
 	const void *private_data)
 {
-	NOT_IMPLEMENTED();
+	// AppHints can't be queryed (from outside the driver) or changed, so the callbacks aren't
+	// used.
+	// TODO(MA-589): Implement.
 }
 
 void
@@ -135,7 +185,9 @@
 	const PVRSRV_DEVICE_NODE *device,
 	const void *private_data)
 {
-	NOT_IMPLEMENTED();
+	// AppHints can't be queryed (from outside the driver) or changed, so the callbacks aren't
+	// used.
+	// TODO(MA-589): Implement.
 }
 
 void
@@ -146,7 +198,9 @@
 	const PVRSRV_DEVICE_NODE *device,
 	const void *private_data)
 {
-	NOT_IMPLEMENTED();
+	// AppHints can't be queryed (from outside the driver) or changed, so the callbacks aren't
+	// used.
+	// TODO(MA-589): Implement.
 }
 
 void
@@ -157,7 +211,9 @@
 	const PVRSRV_DEVICE_NODE *device,
 	const void *private_data)
 {
-	NOT_IMPLEMENTED();
+	// AppHints can't be queryed (from outside the driver) or changed, so the callbacks aren't
+	// used.
+	// TODO(MA-589): Implement.
 }
 
 /* EOF */