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| 型號(hào)： | 30044-23 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | Low Power Integrated x86-Compatible with MMX Support 32-Bit Geode GXm Processor(低功耗集成兼容X86帶有MMX的32位 Geode GXm技術(shù)處理器) |
| 中文描述： | 32-BIT, 200 MHz, MICROPROCESSOR, CPGA320 |
| 封裝： | SPGA-320 |
| 文件頁(yè)數(shù)： | 87/244頁(yè) |
| 文件大小： | 4496K |
| 代理商： | 30044-23 |
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Revision 3.1
87
www.national.com
Processor Programming (
Continued
)
G
3.13.3 Privilege Level Transfers
A task’s CPL can be changed only through intersegment
control transfers using gates or task switches to a code
segment with a different privilege level. Control transfers
result from exception and interrupt servicing and from
execution of the CALL, JMP, INT, IRET and RET instruc-
tions.
There are five types of control transfers that are summa-
rized in Table 3-38. Control transfers can be made only
when the operation causing the control transfer references
the correct descriptor type. Any violation of these descriptor
usage rules causes a general protection fault.
Any control transfer that changes the CPL within a task
results in a change of stack. The initial values for the stack
segment (SS) and stack pointer (ESP) for privilege levels
0, 1, and 2 are stored in the TSS. During a JMP or CALL
control transfer, the SS and ESP are loaded with the new
stack pointer and the previous stack pointer is saved on
the new stack. When returning to the original privilege
level, the RET or IRET instruction restores the SS and
ESP of the less-privileged stack.
3.13.3.1 Gates
Gate descriptors described in Section 3.7.5 “Gate
Descriptors” on page 69, provide protection for privilege
transfers among executable segments. Gates are used to
transition to routines of the same or a more privileged
level. Call gates, interrupt gates and trap gates are used for
privilege transfers within a task. Task gates are used to
transfer between tasks.
Gates conform to the standard rules of privilege. In other
words, gates can be accessed by a task if the effective
privilege level (EPL) is the same or more privileged than
the gate descriptor’s privilege level (DPL).
3.13.4 Initialization and Transition to Protected Mode
The GXm processor core switches to real mode immedi-
ately after RESET. While operating in real mode, the sys-
tem tables and registers should be initialized. The GDTR
and IDTR must point to a valid GDT and IDT, respectively. The
size of the IDT should be at least 256 bytes, and the GDT
must contain descriptors that describe the initial code and
data segments.
The processor can be placed in protected mode by setting
the PE bit (CR0 register bit 0). After enabling protected
mode, the CS register should be loaded and the instruc-
tion decode queue should be flushed by executing an
intersegment JMP. Finally, all data segment registers
should be initialized with appropriate selector values.
Table 3-38. Descriptor Types Used for Control Transfer
Type of Control Transfer
Operation Types
Descriptor
Referenced
Descriptor
Table
Intersegment within the same privilege
level.
JMP, CALL, RET, IRET*
Code Segment
GDT or LDT
Intersegment to the same or a more
privileged level. Interrupt within task
(could change CPL level).
CALL
Gate Call
GDT or LDT
InterruptInstruction,Exception,
External Interrupt
Trap or Interrupt Gate
IDT
Intersegment to a less privileged level
(changes task CPL).
RET, IRET*
Code Segment
GDT or LDT
Task Switch via TSS
CALL, JMP
Task State Segment
GDT
Task Switch via Task Gate
CALL, JMP
Task Gate
GDT or LDT
IRET**, Interrupt Instruction,
Exception, External Interrupt
Task Gate
IDT
Note:
*NT = 0 (Nested Task bit in EFLAGS, bit 14)
**NT =1 (Nested Task bit in EFLAGS, bit 14)
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PDF描述 |
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| 30046-23 | Low Power Integrated x86-Compatible 32-Bit Geode GXLV Processor(低功耗集成兼容X86的32位 Geode GXLV技術(shù)處理器) |
| 300471U | Radial, -55dotc, long life wsitching-power |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| 3004430 | 功能描述:DIN導(dǎo)軌式接線端子 UK 5-MTK RoHS:否 制造商:Phoenix Contact 類(lèi)型:Feed Through Modular Terminal Block 位置/觸點(diǎn)數(shù)量:1 線規(guī)量程:26-14 電流額定值:5 A, 15 A 電壓額定值:300 V, 600 V 安裝風(fēng)格: 端接類(lèi)型:Push-In |
| 30044-44L | 制造商:LENOX 功能描述:HOLE SAW BI-METAL 70MM |
| 3004472 | 制造商:Phoenix Contact 功能描述:UK 5-HESI (5X20) |
| 300448 | 功能描述:手工工具 RETAINING PIN RoHS:否 制造商:Molex 產(chǎn)品:Extraction Tools 類(lèi)型: 描述/功能:Extraction tool |
| 300449 | 制造商:MACOM 制造商全稱(chēng):Tyco Electronics 功能描述:HAND TOOL ASSEMBLY |
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