+/* Hardware Abstraction Layer: lowlevel byte-wise write access */
+
+extern cmos_access_t cmos_hal, memory_hal;
+static cmos_access_t *current_access = &cmos_hal;
+
+void select_hal(hal_t hal, void *data)
+{
+ switch(hal) {
+ case HAL_CMOS:
+ current_access = &cmos_hal;
+ break;
+ case HAL_MEMORY:
+ current_access = &memory_hal;
+ break;
+ }
+ current_access->init(data);
+}
+
+/* Bit-level access */