计算页面大小和段大小

Question

在分页分段的系统中，虚拟地址的偏移量为32位和12位，段的虚拟地址为11位，页码的虚拟地址为9位。如何计算页面大小，最大段大小和最大段大小数？

Answer 1

• 12 bits are reserved for offset, so the page size is 2^12 = 4KB
• 9 bits are reserved for page number, so each segment can contain 2^9 = 512 pages
• Each segment can grow up to size of (# of pages) * (pages size), so maximum segment size is 512 * 4K = 2M

For more information see http://www.cs.umass.edu/~weems/CmpSci535/Discussion21.html