Plan 9: Poking PCI Hardware

 

Poking the VGA card 

term% cat /dev/pci/*ctl
06.00.00 8086/29c0   0
03.00.00 1234/1111   0 0:fd000008 16777216 2:feb94000 4096
02.00.00 8086/10d3  11 0:feb40000 131072 1:feb60000 131072 2:0000c041 32 3:feb90000 16384
00.ff.00 1234/11e8  11 0:fea00000 1048576
06.01.00 8086/2918   0
01.06.01 8086/2922  10 4:0000c061 32 5:feb95000 4096
0c.05.00 8086/2930  10 4:00000701 64
term% cat /dev/vgactl
type vesa
size 1280x720x32 x8r8g8b8
tilt none
hwgc soft
hwaccel off
hwblank on
addr p 0xfd000000 v 0xfffffe80fd000000 size 0x1000000
softscreen on
term% echo 1280*4 | bc
5120
term% grep -l  1234/1111 /dev/pci/*ctl
/dev/pci/0.1.0ctl
term% dd -if /dev/pci/0.1.0bar0 -of /dev/pci/0.1.0bar0 -bs 5120 -count 64 -oseek 200
64+0 records in
64+0 records out



Code

 

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