uvm_mem_mam——寄存器模型（十三）

//------------------------------------------------------------------------------
//
// Title: Memory Allocation Manager
//
// Manages the exclusive allocation of consecutive memory locations
// called ~regions~.
// The regions can subsequently be accessed like little memories of
// their own, without knowing in which memory or offset they are
// actually located.
//
// The memory allocation manager should be used by any
// application-level process
// that requires reserved space in the memory,
// such as DMA buffers.
//
// A region will remain reserved until it is explicitly released.
//
//------------------------------------------------------------------------------

`ifndef UVM_MEM_MAM__SV
`define UVM_MEM_MAM__SV

typedef class uvm_mem_mam_cfg;
typedef class uvm_mem_region;
typedef class uvm_mem_mam_policy;

typedef class uvm_mem;

//------------------------------------------------------------------------------
// CLASS: uvm_mem_mam
//------------------------------------------------------------------------------
// Memory allocation manager
//
// Memory allocation management utility class similar to C's malloc()
// and free().
// A single instance of this class is used to manage a single,
// contiguous address space.
//------------------------------------------------------------------------------

class uvm_mem_mam;

//----------------------
// Group: Initialization
//----------------------

// Type: alloc_mode_e
//
// Memory allocation mode
//
// Specifies how to allocate a memory region
//
// GREEDY   - Consume new, previously unallocated memory
// THRIFTY  - Reused previously released memory as much as possible (not yet implemented)
//
typedef enum {GREEDY, THRIFTY} alloc_mode_e;

// Type: locality_e
//
// Location of memory regions
//
// Specifies where to locate new memory regions
//
// BROAD    - Locate new regions randomly throughout the address space
// NEARBY   - Locate new regions adjacent to existing regions

typedef enum {BROAD, NEARBY}   locality_e;

// Variable: default_alloc
//
// Region allocation policy
//
// This object is repeatedly randomized when allocating new regions.
uvm_mem_mam_policy default_alloc;

local uvm_mem memory;
local uvm_mem_mam_cfg cfg;
local uvm_mem_region in_use[$];
local int for_each_idx = -1;
local string fname;
local int lineno;