[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] Implementation of BusLogic SCSI host adapter (BT-958)
From: |
Денис Дмитриев |
Subject: |
[Qemu-devel] Implementation of BusLogic SCSI host adapter (BT-958) |
Date: |
Wed, 31 Aug 2016 16:48:42 +0300 |
Hi,
I'm trying to implement a buslogic scsi adapter(BT-958) for qemu. I
realized the driver interaction with the ports through which the driver can
write / read commands and parameters for the adapter. The driver was able
to make an adapter sample procedure. The problem is that I do not
understand how to establish communication between the driver and adapter
for transferring mailboxes. I got the address of the mailboxes from the
driver. Then I calculated the start address of the desired mailbox (the
same address to which a driver recorded a mailbox). After that, I try to
read the data at this address using pci_dma_read function but no buffer
data after reading.
uint64_t buslogicReadOutgoingMailbox(BuslogicState *s, BUSLOGICTASKSTATE
*TaskState)
{
uint64_t GCMailbox;
Mailbox24 Mbx24;
Mbx24.uCmdState = 0;
PCIDevice *pci_dev = PCI_DEVICE(s);
if (s->fMbxIs24Bit)
{
//try to calculate mailbox address
GCMailbox = s->GCPhysAddrMailboxOutgoingBase +
(s->uMailboxOutgoingPositionCurrent * sizeof(Mailbox24));
//try to read mailbox
pci_dma_read(pci_dev, GCMailbox, &Mbx24, sizeof(Mailbox24));
//after that i have empty buffer
TaskState->MailboxGuest.u32PhysAddrCCB =
ADDR_TO_U32(Mbx24.aPhysAddrCCB);
TaskState->MailboxGuest.u.out.uActionCode = Mbx24.uCmdState;
}
else
{
GCMailbox = s->GCPhysAddrMailboxOutgoingBase +
(s->uMailboxOutgoingPositionCurrent * sizeof(Mailbox32));
pci_dma_read(pci_dev, GCMailbox, &TaskState->MailboxGuest,
sizeof(Mailbox32));
}
return GCMailbox;
}
[Prev in Thread] |
Current Thread |
[Next in Thread] |
- [Qemu-devel] Implementation of BusLogic SCSI host adapter (BT-958),
Денис Дмитриев <=