VxWorks中的地址映射

E                       0x04
#define VM_STATE_WRITABLE_NOT                  0x00
#define VM_STATE_CACHEABLE                     0x10
#define VM_STATE_CACHEABLE_NOT           0x00
同

样不同的CPU芯片类型还有其特殊状态

2、 初始化结构

在 Tornado\target\config\ads860\sysLib.c 文件中：
PHYS_MEM_DESC sysPhysMemDesc [] =
{
  {
  (void *) LOCAL_MEM_LOCAL_ADRS,
  (void *) LOCAL_MEM_LOCAL_ADRS,
  LOCAL_MEM_SIZE ,
  VM_STATE_MASK_VALID | VM_STATE_MASK_WRITABLE |
VM_STATE_MASK_CACHEABLE,
  VM_STATE_VALID | VM_STATE_WRITABLE | VM_STATE_CACHEABLE
  },
  {
  (void *) BCSR0,
  (void *) BCSR0,
  0x00001000,    /* 4 k - Board Control and Status */ 
  VM_STATE_MASK_VALID | VM_STATE_MASK_WRITABLE |
VM_STATE_MASK_CACHEABLE | VM_STATE_MASK_GUARDED,
  VM_STATE_VALID | VM_STATE_WRITABLE | VM_STATE_CACHEABLE_NOT |
VM_STATE_GUARDED
  },
  ……
  {
  (void *) INTERNAL_MEM_MAP_ADDR,
  (void *) INTERNAL_MEM_MAP_ADDR,
  INTERNAL_MEM_MAP_SIZE,  /* 64 k - Internal Memory Map */ 
  VM_STATE_MASK_VALID | VM_STATE_MASK_WRITABLE |
VM_STATE_MASK_CACHEABLE | VM_STATE_MASK_GUARDED,
  VM_STATE_VALID | VM_STATE_WRITABLE | VM_STATE_CACHEABLE_NOT |
    VM_STATE_GUARDED
  },
  {
  (void *) ROM_BASE_ADRS,
  (void *) ROM_BASE_ADRS,
  ROM_SIZE,    /* Flach memory */ 
  VM_STATE_MASK_VALID | VM_STATE_MASK_WRITABLE |
VM_STATE_MASK_CACHEABLE ,
  VM_STATE_VALID | VM_STATE_WRITABLE | VM_STATE_CACHEABLE_NOT
  }
};
上面结构中是缺省地址映射。

3、 地址初始化

在Tornado\target\src\config\ usrMmuInit.c 文件中
通过函数usrMmuInit使地址映射生效

4、 实现映射：

如你定义flash地址为0x04000000开始的8Mbyte地址，则可以如下进行地址映射
    {
    (void *) 0x04000000,
    (void *) 0x0400

《VxWorks中的地址映射(第2页)》