uvm_pkg——老板，打包带走

Thus spake the master programmer: “After three day without programming, life becomes meaningless.”
编程大师曰：“倘若三天不编程，生活将变得毫无意义。”

　　在SV中引入了package 的概念，可以使多个模块进行数据类型共享，使用作用域解析符对包进行引用（::）,从UVM 的包总来看主要包括：uvm_macros包含UVM的所有宏定义，dpi目录定义外部语言接口，base包UVM中基础的class，dap是Data Access Policy, tlm1 包含Tranaction layer model 1的类定义。comps定义所有UVM中所用的component. seq目录是sequence机制的实现，TLM2则是对TLM2机制的实现，reg包含寄存器模型的实现。

`ifndef UVM_PKG_SV
`define UVM_PKG_SV

`include "uvm_macros.svh"

package uvm_pkg;

`include "dpi/uvm_dpi.svh"
`include "base/uvm_base.svh"
`include "dap/uvm_dap.svh"
`include "tlm1/uvm_tlm.svh"
`include "comps/uvm_comps.svh"
`include "seq/uvm_seq.svh"
`include "tlm2/uvm_tlm2.svh"
`include "reg/uvm_reg_model.svh"

endpackage

`endif