DISPC_GLOBAL_BUFFER
v = dispc_read_reg(dispc, DISPC_GLOBAL_BUFFER);
dispc_write_reg(dispc, DISPC_GLOBAL_BUFFER, v);
#define DISPC_GLOBAL_BUFFER REG(DISPC_GLOBAL_BUFFER)
v = dispc_read_reg(DISPC_GLOBAL_BUFFER);
dispc_write_reg(DISPC_GLOBAL_BUFFER, v);