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Add DoorbellRegister comment

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This commit is contained in:
Josh Holtrop 2024-02-09 13:02:05 -05:00
parent 9874802ee4
commit 2a66443a49
1 changed files with 7 additions and 0 deletions
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7
src/hulk/usb/xhci.d
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@ -35,6 +35,7 @@ struct XHCI
ushort hci_version; ushort hci_version;
/** /**
* HCSPARAMS1.
* 7:0 number of device slots (MaxSlots) * 7:0 number of device slots (MaxSlots)
* 18:8 number of interrupters (MaxIntrs) * 18:8 number of interrupters (MaxIntrs)
* 23:19 reserved * 23:19 reserved
@ -320,6 +321,12 @@ struct XHCI
ulong erdp; ulong erdp;
} }
/**
* Located at offset doorbell_offset from PCI base address.
*
* The number of these is given by HCSPARAMS1.MaxSlots + 1 (for the command
* ring).
*/
struct DoorbellRegister struct DoorbellRegister
{ {
ubyte target; ubyte target;