One important distinction: for a fixnum, the upper bits hold the integer value directly (an immediate). For all other types, those bits are a heap pointer to the underlying C struct.
To avoid the two memory reads on every access, the 386 includes a 32-entry Translation Lookaside Buffer (TLB) organized as 8 sets with 4 ways each. Each entry stores the virtual-to-physical mapping along with the combined PDE+PTE permission bits.
，更多细节参见新收录的资料
Фото: Nathan Howard / Reuters，推荐阅读新收录的资料获取更多信息
The Best Cheap Laptops to Get Your Money's Worth
НАТО проведут учения рядом с российской границей02:50