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Friday, March 11, 2011

x86 memory segmentation

Protection thus mirrors memory address translation where both segmentation

Protection thus mirrors memory address translation where both segmentation

 and I/O benchmarks suffered from runtime memory segmentation faults when

and I/O benchmarks suffered from runtime memory segmentation faults when

Real mode segment starts range from 0 all the way to 0xFFFF0 (16 bytes short

Real mode segment starts range from 0 all the way to 0xFFFF0 (16 bytes short

The use of segment registers in segmented memory model

The use of segment registers in segmented memory model

Required reading: Chapter 3 (Protected-Mode Memory). x86 translation diagram

Required reading: Chapter 3 (Protected-Mode Memory). x86 translation diagram

Segmentation in a 32 bit x86 system. Since the processor knows what segments

Segmentation in a 32 bit x86 system. Since the processor knows what segments

Project 4: (Virtual Memory) replaces the segmentation based user memory

Project 4: (Virtual Memory) replaces the segmentation based user memory

A single x86 instruction may need many source operands when memory is

A single x86 instruction may need many source operands when memory is

Solution: Paged segmentation (x86 architecture). Segmentation hardware:

Solution: Paged segmentation (x86 architecture). Segmentation hardware:

Figure D-2: VxWorks System Memory Layout (x86 Upper Memory)

Figure D-2: VxWorks System Memory Layout (x86 Upper Memory)

 control segmented memory management(分段内存管理) (see Figure 2-5).

control segmented memory management(分段内存管理) (see Figure 2-5).

Memory Segmentation in Real Mode. Figure 2展示保護模式記憶體定址方式,其觀念

Memory Segmentation in Real Mode. Figure 2展示保護模式記憶體定址方式,其觀念

Protected Mode Segmentation

Protected Mode Segmentation

0x253 Program Memory Segmentation

0x253 Program Memory Segmentation

Illustration of C's process memory layout on an x86

Illustration of C's process memory layout on an x86

Pineview integrates the graphics core and memory controller that the

Pineview integrates the graphics core and memory controller that the

Figure 1: VxWorks System Memory Layout (x86 Lower Memory)

Figure 1: VxWorks System Memory Layout (x86 Lower Memory)

The memory allocated for these local variables isn't pushed to the stack,

The memory allocated for these local variables isn't pushed to the stack,

x86 data path

x86 data path

This memory segment has a fixed size.

This memory segment has a fixed size.