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asuka2001 发表于 2013-12-24 08:59 ![]()
回复 4# 冬瓜头
可以,之所以需要os设置bar,是因为CPU域的物理地址空间有限,而且不能产生冲突。
请问这个把PCIE空间映射到主存空间的过程,是否在内核代码里有体现?或者说因为x86是简单的相等关系,所以写死了不需要代码做什么事情了?下面的输出中并没有找到这种反向映射关系。。
01:00.0 Serial Attached SCSI controller: Adaptec Device 8088 (rev 06)
Subsystem: Adaptec Device 0800
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 16
Region 0: Memory at f7d50000 (64-bit, non-prefetchable) [size=64K]
Region 2: Memory at f7d40000 (64-bit, non-prefetchable) [size=64K]
Region 5: Memory at f7d00000 (32-bit, non-prefetchable) [size=256K]
Expansion ROM at f7c00000 [disabled] [size=1M]
Capabilities: [80] Power Management version 3
Flags: PMEClk- DSI- D1+ D2- AuxCurrent=0mA PME(D0+,D1+,D2-,D3hot+,D3cold-)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [88] Vital Product Data
Unknown large resource type 20, will not decode more.
Capabilities: [90] MSI: Enable- Count=1/32 Maskable+ 64bit+
Address: 0000000000000000 Data: 0000
Masking: 00000000 Pending: 00000000
Capabilities: [b0] MSI-X: Enable+ Count=64 Masked-
Vector table: BAR=0 offset=00000400
PBA: BAR=0 offset=00000800
Capabilities: [c0] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s <4us, L1 <1us
ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+ FLReset-
MaxPayload 256 bytes, MaxReadReq 512 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr- TransPend-
LnkCap: Port #0, Speed unknown, Width x8, ASPM L0s L1, Latency L0 <1us, L1 <1us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed unknown, Width x8, TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range B, TimeoutDis+
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-
LnkCtl2: Target Link Speed: Unknown, EnterCompliance- SpeedDis-, Selectable De-emphasis: -6dB
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB
Capabilities: [100] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES+ TLP+ FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
Capabilities: [150] Device Serial Number 00-00-00-00-00-00-00-00
Capabilities: [160] Power Budgeting <?>
Capabilities: [1b0] Latency Tolerance Reporting
Max snoop latency: 0ns
Max no snoop latency: 0ns
Capabilities: [1c0] #16
Capabilities: [274] Transaction Processing Hints
Interrupt vector mode supported
Device specific mode supported
Steering table in TPH capability structure
Capabilities: [300] #19
Capabilities: [400] Vendor Specific Information <?>
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