驱动学习---PAE--virtual address to physics address PAE是Physical Address Extension的缩写,即物理地址扩展。简单来说,就是把IA-32处理器的寻址能力从原来的4GB扩展到64GB。寻址4GB空间,要求物理地址的宽度为32位。类似的,要寻址64GB空间,那么物理地址的宽度就是36位。因为这个原因,PAE又被称为PAE-36bit。 一般...
系统层面，虚拟地址的产生原因之一是软件应用地址空间的膨胀，远远超出了实际物理空间。此时，硬件或软件不仅要完成业务，还需承担VA到PA的转换任务，确保业务能访问到真实的物理地址空间。虚拟地址的另一层意义，在于为软件减负，让开发者无需关心变量的物理存储位置，避免地址冲突的困扰。为实现这一转换，硬...
在系统层面上,虚拟地址产生的原因之一也是因为软件应用的地址空间远大于实际物理空间。这个时候系统上的硬件或者软件除了需要完成业务,还要进行VA到PA的转换,让业务访问到实际的物理地址空间。 虚拟地址产生的另外一个原因就是给软件减负,在撸代码的时候不会关心变量具体存在那里,会不会和其它的地址范围发生冲突。 为了...
PAD复用、仲裁等等都是因为多个输出需求只对应一个实际输出端口,这个时候选择哪个请求也是有讲究的。 在系统层面上,虚拟地址产生的原因之一也是因为软件应用的地址空间远大于实际物理空间。这个时候系统上的硬件或者软件除了需要完成业务,还要进行VA到PA的转换,让业务访问到实际的物理地址空间。 虚拟地址产生的另外一个原...
后来在研究 Page Table的时候有看到介绍这么说,When a process requests access to its memory, it is the responsibility of the operating system to map the virtual address provided by the process to the physical address where that memory is stored. The page table is where the operating system stores...
Embodiments of the invention are generally directed to systems, methods, and apparatuses for linear to physical address translation with support for page attributes. In some embodiments, a system receives an instruction to translate a memory pointer to a physical memory address for a memory location....
Base physical address of each table entry is extended to 24 bits. Add this to 12 bits of byte index from virtual address, you get 36 bits to address the physical memory. Total addressable memory may be as big as 64GB with 36 bits. ...
Converting a virtual address to a physical address using !vtop Make sure that you are working in hexadecimal. If necessary, set the current base with theN 16command. Determine thebyte indexof the address. This number is equal to the lowest 12 bits of the virtual address. Thus, t...
Translates a virtual address to a pysical address using information found in the guest's memory and processor's state.SyntaxC 複製 HRESULT WINAPI GuestVirtualAddressToPhysicalAddress( _In_ VM_SAVED_STATE_DUMP_HANDLE VmSavedStateDumpHandle, _In_ UINT32 VpId, _In_ const GUEST_VIRTUA...
VIRTUAL TO PHYSICAL ADDRESS TRANSLATION 专利内容由知识产权出版社提供 专利名称:VIRTUAL TO PHYSICAL ADDRESS T RANSLAT ION 发明人:MCALPINE, Gary,MINTURN, Dave,REGNIER, Greg,BERRY, Frank 申请号:EP 04 8154 72.8 申请日:2004 1224 公开号:EP 170954 0A2 公开日:20061011 摘要:A virtual to physical ...