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| 型號： | KU386 |
| 廠商： | Intel Corp. |
| 英文描述： | SX MICROPROCESSOR |
| 中文描述： | SX微處理器 |
| 文件頁數(shù)： | 23/102頁 |
| 文件大?。?/td> | 1268K |
| 代理商： | KU386 |
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Intel386
TM
SX MICROPROCESSOR
Table 3.1. Exceptions in Real Mode
Function
Interrupt
Number
Related
Instructions
Return
Address Location
Interrupt table limit
too small
8
INT vector is not
within table limit
Before
Instruction
CS, DS, ES, FS, GS
Segment overrun exception
13
Word memory reference
with offset
e
0FFFFH.
an attempt to execute
past the end of CS segment.
Before
Instruction
SS Segment overrun
exception
12
Stack Reference
beyond offset
e
0FFFFH
Before
Instruction
3.2 Reserved Locations
There are two fixed areas in memory which are re-
served in Real address mode: the system initializa-
tion area and the interrupt table area. Locations
00000H through 003FFH are reserved for interrupt
vectors. Each one of the 256 possible interrupts has
a 4-byte jump vector reserved for it. Locations
0FFFFF0H through 0FFFFFFH are reserved for sys-
tem initialization.
3.3 Interrupts
Many of the exceptions discussed in section 2.7 are
not applicable to Real Mode operation; in particular,
exceptions 10, 11 and 14 do not occur in Real
Mode. Other exceptions have slightly different
meanings in Real Mode; Table 3.1 identifies these
exceptions.
3.4 Shutdown and Halt
The HLT instruction stops program execution and
prevents the processor from using the local bus until
restarted. Either NMI, FLT
Y
, INTR with interrupts
enabled (IF
e
1), or RESET will force the Intel386 SX
Microprocessor out of halt. If interrupted, the saved
CS:IP will point to the next instruction after the HLT.
Shutdown will occur when a severe error is detected
that prevents further processing. In Real Mode,
shutdown can occur under two conditions:
1. An interrupt or an exception occurs (Exceptions 8
or 13) and the interrupt vector is larger than the
Interrupt Descriptor Table.
2. A CALL, INT or PUSH instruction attempts to
wrap around the stack segment when SP is not
even.
An NMI input can bring the processor out of shut-
down if the Interrupt Descriptor Table limit is large
enough to contain the NMI interrupt vector (at least
000FH) and the stack has enough room to contain
the vector and flag information (i.e. SP is greater that
0005H). Otherwise, shutdown can only be exited by
a processor reset.
3.5 LOCK Operation
The LOCK prefix on the Intel386 SX Microprocessor,
even in Real Mode, is more restrictive than on the
80286. This is due to the addition of paging on the
Intel386 SX Microprocessor in Protected Mode and
Virtual 8086 Mode. The LOCK prefix is not support-
ed during repeat string instructions.
The only instruction forms where the LOCK prefix is
legal on the Intel386 SX Microprocessor are shown
in Table 3.2.
Table 3.2. Legal Instructions for the LOCK Prefix
Opcode
Operands
(Dest, Source)
BIT Test and
SET/RESET
/COMPLEMENT
Mem, Reg/Immediate
XCHG
Reg, Mem
XCHG
Mem, Reg
ADD, OR, ADC, SBB,
AND, SUB, XOR
Mem, Reg/Immediate
NOT, NEG, INC, DEC
Mem
An exception 6 will be generated if a LOCK prefix is
placed before any instruction form or opcode not
listed above. The LOCK prefix allows indivisible
read/modify/write operations on memory operands
using the instructions above.
The LOCK prefix is not IOPL-sensitive on the
Intel386 SX Microprocessor. The LOCK prefix can
be used at any privilege level, but only on the in-
struction forms listed in Table 3.2.
23
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