Dynamically allocate each drive_g with malloc_fseg().

This eliminates the limit on the number of available drives.  It also
allows for each driver to allocate additional custom fields.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/biosvar.h b/src/biosvar.h
index d011966b..c67503cd 100644
--- a/src/biosvar.h
+++ b/src/biosvar.h
@@ -329,9 +329,11 @@ static inline u16 get_global_seg(void) {
         (var) = (val);                          \
     } while (0)
 #if MODESEGMENT
-#define ADJUST_GLOBAL_PTR(var) (var)
+#define STORE_GLOBAL_PTR(var) (var)
+#define RETRIEVE_GLOBAL_PTR(var) (var)
 #else
-#define ADJUST_GLOBAL_PTR(var) ((typeof(var))((void*)var - BUILD_BIOS_ADDR))
+#define STORE_GLOBAL_PTR(var) ((typeof(var))((void*)var - BUILD_BIOS_ADDR))
+#define RETRIEVE_GLOBAL_PTR(var) ((typeof(var))((void*)var + BUILD_BIOS_ADDR))
 #endif