VM86 mode uses a segmentation scheme identical to that of real mode ( for compatibility reasons ) which creates 20-bit linear addresses in the same manner as 20-bit physical addresses are created in real mode, but are subject to protected mode's memory paging mechanism.
22.
However segmentation in 32-bit mode does not allow to access a larger address space than what a single segment would cover, unless some segments are not always present in memory and the linear address space is just used as a " cache " over a larger segmented virtual space.
23.
For example, the linear address 08124h can have the segmented addresses 06EFh : 1234h, 0812h : 0004h, 0000h : 8124h, etc . This could be confusing to programmers accustomed to unique addressing schemes, but it can also be used to advantage, for example when addressing multiple nested data structures.
24.
However it is lacked of integer general purpose register makes it different than its x86 counterpart . ), an 64-bit ALU, a 512?8-bit instruction RAM, a 512?6-bit data RAM, two internal 16-bit buses, a wide instruction word processor, a variable length sequence decoder, a pixel interpolator and an interface supporting a 4 GB linear address space.
25.
The last incarnations of the x86 architecture support up to 36 bits of physical memory addresses, which were mapped to the 32-bit linear address space through the 80286 processor, which, though supporting only 16 MB of physical memory, could access up to 1 GB of virtual memory, but the combination of 16-bit address and segment registers made accessing more than 64 KB in one data structure cumbersome.
26.
Such address translations are carried out by the segmentation unit of the CPU . The last segment, FFFFh ( 65535 ), begins at linear address FFFF0h ( 1048560 ), 16 bytes before the end of the 20 bit address space, and thus, can access, with an offset of up to 65, 536 bytes, up to 65, 520 ( 65536 " 16 ) bytes past the end of the 20 bit 8088 address space.
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