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[Qemu-devel] [PATCH 2/2] xnu kernel expects FLUSH to be cleared on STOP
From: |
Amadeusz Sławiński |
Subject: |
[Qemu-devel] [PATCH 2/2] xnu kernel expects FLUSH to be cleared on STOP |
Date: |
Thu, 21 Feb 2013 18:34:11 +0100 |
otherwise it gets stuck in a loop
so clear it when unsetting run when flush is set
void
IODBDMAStop( volatile IODBDMAChannelRegisters *registers)
{
IOSetDBDMAChannelControl( registers,
IOClearDBDMAChannelControlBits( kdbdmaRun )
| IOSetDBDMAChannelControlBits( kdbdmaFlush ));
DBDMA: writel 0x0000000000000b00 <= 0xa0002000
DBDMA: channel 0x16 reg 0x0
DBDMA: status 0x00002000
while( IOGetDBDMAChannelStatus( registers) & (
kdbdmaActive | kdbdmaFlush))
eieio();
DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
DBDMA: readl 0x0000000000000b04 => 0x00002000
DBDMA: channel 0x16 reg 0x1
it continues to get printed
}
Signed-off-by: Amadeusz Sławiński <address@hidden>
---
hw/mac_dbdma.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/hw/mac_dbdma.c b/hw/mac_dbdma.c
index b894ab2..34c1757 100644
--- a/hw/mac_dbdma.c
+++ b/hw/mac_dbdma.c
@@ -688,6 +688,10 @@ dbdma_control_write(DBDMA_channel *ch)
if ((ch->regs[DBDMA_STATUS] & RUN) && !(status & RUN)) {
/* RUN is cleared */
status &= ~(ACTIVE|DEAD);
+ if ((status & FLUSH) && ch->flush) {
+ ch->flush(&ch->io);
+ status &= ~FLUSH;
+ }
}
DBDMA_DPRINTF(" status 0x%08x\n", status);
--
1.8.1.4