參數(shù)資料
型號: intel386 DX
廠商: Intel Corp.
英文描述: 32-Bit CHMOS Microprocessor With Integrated Memory Management(32位CHMOS 微處理器帶集成存儲管理)
中文描述: 32位CHMOS微處理器集成內(nèi)存管理(32位CHMOS微處理器帶集成存儲管理)
文件頁數(shù): 57/139頁
文件大小: 1587K
代理商: INTEL386 DX
Intel386
TM
DX MICROPROCESSOR
231630–69
Figure 4-24. Virtual 8086 Environment Memory Management
erating system code between multiple 8086 applica-
tions. Figure 4-24 shows how the Intel386 DX paging
hardware enables multiple 8086 programs to run un-
der a virtual memory demand paged system.
4.6.4 Protection and I/O Permission
Bitmap
All Virtual 8086 Mode programs execute at privilege
level 3, the level of least privilege. As such, Virtual
8086 Mode programs are subject to all of the protec-
tion checks defined in Protected Mode. (This is dif-
ferent from Real Mode which implicitly is executing
at privilege level 0, the level of greatest privilege.)
Thus, an attempt to execute a privileged instruction
when in Virtual 8086 Mode will cause an exception
13 fault.
The following are privileged instructions, which may
be executed only at Privilege Level 0. Therefore, at-
tempting to execute these instructions in Virtual
8086 Mode (or anytime CPL
l
0) causes an excep-
tion 13 fault:
LIDT;
LGDT;
MOV DRn,reg;
MOV TRn,reg;
MOV reg,DRn;
MOV reg,TRn;
LMSW;
CLTS;
HLT;
MOV CRn,reg;
MOV reg,CRn.
Several instructions, particularly those applying to
the multitasking model and protection model, are
available only in Protected Mode. Therefore, at-
tempting to execute the following instructions in
Real Mode or in Virtual 8086 Mode generates an
exception 6 fault:
LTR;
LLDT;
LAR;
LSL;
ARPL.
STR;
SLDT;
VERR;
VERW;
The instructions which are IOPL-sensitive in Protect-
ed Mode are:
IN;
OUT;
INS;
OUTS;
REP INS;
REP OUTS;
STI;
CLI
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