參數(shù)資料
型號: 20726
英文描述: 3DNow!? Technology Manual AMD-K6 Processor Multimedia Technology
中文描述: 3DNow???技術(shù)手冊的AMD - K6處理器多媒體技術(shù)
文件頁數(shù): 18/120頁
文件大?。?/td> 1284K
代理商: 20726
12
Programming Considerations
AMD-K6 MMX Enhanced Processor Multimedia Technology
20726D/0—January 2000
Preliminary Information
Preemptive
Multitasking
In preemptive multitasking operating systems like OS/2,
Windows NT, and UNIX, the operating system handles all
state and register saves. The application programmer does not
need to save states when programming within a preemptive
multitasking environment. The preemptive multitasking
operating system sets aside a save area for each task.
In a preemptive multitasking operating system, if a task switch
occurs, the operating system sets the Control Register 0 (CR0)
Task Switch (TS) bit to 1. If the new task encounters a
floating-point or MMX instruction, an interrupt 7 (int 7, Device
Not Available) is generated. The int7 handler saves the state of
the first task and restores the state of the second task. The int7
handler sets the CR0.TS to 0 and returns to the original
floating-point or MMX instruction in the second task. Figure 4
illustrates this task switching process.
Figure 4. Preemptive Task Switching
executing
MMX
/FP code
executing code
Save Task 1 State
Restore Task 2
Set CR0.TS=0
Return to Task 2
MMX/FP code
TASK 1
TASK 2
INT 7 handler
Task Switch
to TASK 2
Set CR0.TS=1
Encounter
MMX/FP code
Because TS=1
goto INT 7
handler
相關(guān)PDF資料
PDF描述
20736 Enhanced Am486DX Family Data Sheet? 1.87MB (PDF)
2075 data delay devices
208-501-21-38 LED TELEFONSOCKEL T6.8 12V ROT
208-521-21-38 LED TELEFONSOCKEL T6.8 12V GELB
208-532-21-38 LED TELEFONSOCKEL T6.8 12V GRUEN
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
20727 制造商:Schneider Electric 功能描述:CIRCUIT BREAKER DECLIC 20A 制造商:Schneider Electric 功能描述:CIRCUIT BREAKER 1 POLE + NEUTRAL 20 A
20728 制造商:Schneider Electric 功能描述:CIRCUIT BREAKER 1 POLE + NEUTRAL 25 A
207289-000 制造商:TE Connectivity 功能描述:CE-14-06000-P-ABRAS-WHEEL 制造商:TE Connectivity 功能描述:CE-14-06000-P-ABRAS-WHEEL - Bulk
20729 制造商:Schneider Electric 功能描述:CIRCUIT BREAKER DECLIC 32A 制造商:Schneider Electric 功能描述:CIRCUIT BREAKER 1 POLE + NEUTRAL 32 A
207292-1 功能描述:標(biāo)準(zhǔn)環(huán)形連接器 CPC RECP 17-16 RoHS:否 制造商:Hirose Connector 系列:EM-W 產(chǎn)品類型:Accessories 位置/觸點(diǎn)數(shù)量:1 觸點(diǎn)類型: 觸點(diǎn)電鍍: 安裝風(fēng)格:Cable 外殼材質(zhì): 端接類型:Clamp 電壓額定值: