PCI device detection
Posted: Mon Jun 03, 2013 1:25 pm
Is this the correct way to crawl through the connected PCI devices?
os_pci_read_reg uses BL for Bus number, CL for Device/Slot number, and DL for Register number.
On a Asus P8H61-M LE/USB3 my OS does not detect any storage device (SATA or PATA). Linux detects it correctly (actually Linux detects more devices).
Partial linux output from 'lspci -vv -nn':
BareMetal detects the ISA bridge but not the two following devices.
Code: Select all
pci:
xor ebx, ebx ; Clear the Bus number
xor ecx, ecx ; Clear the Device/Slot number
mov edx, 2 ; Register 2 for Class code/Subclass
pci_probe_next:
call os_pci_read_reg
shr eax, 16 ; Move the Class/Subclass code to AX
cmp ax, 0xFFFF ; 0xFFFF = non-existant device
je pci_probe_next_skip
call os_debug_dump_ax
mov rsi, newline
call os_output
pci_probe_next_skip:
add ecx, 1
cmp ecx, 32 ; Maximum 32 devices per bus
je pci_probe_next_bus
jmp pci_probe_next
pci_probe_next_bus:
xor ecx, ecx
add ebx, 1
cmp ebx, 256 ; Maximum 256 buses
jne pci_probe_next
jmp os_command_lineOn a Asus P8H61-M LE/USB3 my OS does not detect any storage device (SATA or PATA). Linux detects it correctly (actually Linux detects more devices).
Partial linux output from 'lspci -vv -nn':
Code: Select all
00:1f.0 ISA bridge [0601]: Intel Corporation H61 Express Chipset Family LPC Controller [8086:1c5c] (rev 05)
Subsystem: ASUSTeK Computer Inc. Device [1043:844d]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Capabilities: [e0] Vendor Specific Information: Len=0c <?>
Kernel driver in use: lpc_ich
Kernel modules: lpc_ich
00:1f.2 SATA controller [0106]: Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller [8086:1c02] (rev 05) (prog-if 01 [AHCI 1.0])
Subsystem: ASUSTeK Computer Inc. P8P67 Deluxe Motherboard [1043:844d]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin B routed to IRQ 41
Region 0: I/O ports at f0b0 [size=8]
Region 1: I/O ports at f0a0 [size=4]
Region 2: I/O ports at f090 [size=8]
Region 3: I/O ports at f080 [size=4]
Region 4: I/O ports at f060 [size=32]
Region 5: Memory at f7e06000 (32-bit, non-prefetchable) [size=2K]
Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
Address: fee0f00c Data: 4181
Capabilities: [70] 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: [a8] SATA HBA v1.0 BAR4 Offset=00000004
Capabilities: [b0] PCI Advanced Features
AFCap: TP+ FLR+
AFCtrl: FLR-
AFStatus: TP-
Kernel driver in use: ahci
00:1f.3 SMBus [0c05]: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller [8086:1c22] (rev 05)
Subsystem: ASUSTeK Computer Inc. P8P67 Deluxe Motherboard [1043:844d]
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Interrupt: pin C routed to IRQ 18
Region 0: Memory at f7e05000 (64-bit, non-prefetchable) [size=256]
Region 4: I/O ports at f040 [size=32]
Kernel modules: i2c-i801