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30036-23 参数 Datasheet PDF下载

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型号: 30036-23
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内容描述: 的Geode ™ GXLV处理器系列的低功耗X86集成解决方案 [Geode⑩ GXLV Processor Series Low Power Integrated x86 Solutions]
分类和应用:
文件页数/大小: 247 页 / 4117 K
品牌: NSC [ National Semiconductor ]
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Processor Programming (Continued)  
3.7 SYSTEM MANAGEMENT MODE  
System Management Mode (SMM) is an enhancement of  
the standard x86 architecture. SMM is usually employed  
for system power management or software-transparent  
emulation of I/O peripherals. SMM is entered through a  
hardware signal System Management Interrupt(SMI#  
pin) that has a higher priority than any other interrupt,  
including NMI. An SMM interrupt can also be triggered  
from software using an SMINT instruction. Following an  
SMM interrupt, portions of the CPU state are automati-  
cally saved, SMM is entered, and program execution  
begins at the base of SMM address space (Figure 3-9).  
The GXLV processor extends System Management Mode  
to support the virtualization of many devices, including  
VGA video. The SMM mechanism can be triggered not  
only by I/O activity, but by access to selected memory  
regions. For example, SMM interrupts are generated  
when VGA addresses are accessed. As will be described,  
other SMM enhancements have reduced SMM overhead  
and improved virtualization-software performance  
Potential  
Physical  
Memory Space  
SMM Address  
Space  
FFFFFFFFh  
FFFFFFFFh  
Defined  
SMM  
Address  
Space  
Physical Memory  
4 GB  
4 KB to 32 MB  
00000000h  
Non-SMM  
00000000h  
SMM  
Figure 3-9. System Management Memory Address Space  
Revision 1.1  
83  
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