qemu/hw/scsi
Laurent Vivier 74d71ea16b esp: add pseudo-DMA as used by Macintosh
There is no DMA in Quadra 800, so the CPU reads/writes the data from the
PDMA register (offset 0x100, ESP_PDMA in hw/m68k/q800.c) and copies them
to/from the memory.

There is a nice assembly loop in the kernel to do that, see
linux/drivers/scsi/mac_esp.c:MAC_ESP_PDMA_LOOP().

The start of the transfer is triggered by the DREQ interrupt (see linux
mac_esp_send_pdma_cmd()), the CPU polls on the IRQ flag to start the
transfer after a SCSI command has been sent (in Quadra 800 it goes
through the VIA2, the via2-irq line and the vIFR register)

The Macintosh hardware includes hardware handshaking to prevent the CPU
from reading invalid data or writing data faster than the peripheral
device can accept it.

This is the "blind mode", and from the doc:
"Approximate maximum SCSI transfer rates within a blocks are 1.4 MB per
second for blind transfers in the Macintosh II"

Some references can be found in:
  Apple Macintosh Family Hardware Reference, ISBN 0-201-19255-1
  Guide to the Macintosh Family Hardware, ISBN-0-201-52405-8

Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Co-developed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20191026164546.30020-4-laurent@vivier.eu>
2019-10-28 19:03:45 +01:00
..
emulation.c scsi-generic: avoid invalid access to struct when emulating block limits 2018-11-06 21:35:06 +01:00
esp-pci.c Include migration/vmstate.h less 2019-08-16 13:31:52 +02:00
esp.c esp: add pseudo-DMA as used by Macintosh 2019-10-28 19:03:45 +01:00
Kconfig virtio: express virtio dependencies with Kconfig 2019-03-07 21:45:53 +01:00
lsi53c895a.c scsi: lsi: exit infinite loop while executing script (CVE-2019-12068) 2019-08-20 20:00:52 +02:00
Makefile.objs scsi: express dependencies with Kconfig 2019-03-07 21:45:53 +01:00
megasas.c Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
mfi.h Clean up header guards that don't match their file name 2016-07-12 16:19:16 +02:00
mpi.h hw: Add support for LSI SAS1068 (mptsas) device 2016-02-09 15:45:26 +01:00
mptconfig.c Include hw/hw.h exactly where needed 2019-08-16 13:31:52 +02:00
mptendian.c Include hw/hw.h exactly where needed 2019-08-16 13:31:52 +02:00
mptsas.c Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
mptsas.h mptsas: really fix migration compatibility 2016-08-03 18:44:56 +02:00
scsi-bus.c sysemu: Split sysemu/runstate.h off sysemu/sysemu.h 2019-08-16 13:37:36 +02:00
scsi-disk.c scsi: account unmap operations 2019-10-10 10:56:18 +02:00
scsi-generic.c Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
spapr_vscsi.c Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
srp.h spapr-vscsi: add task management 2013-09-12 08:46:21 +02:00
trace-events trace: Remove trailing newline in events 2019-09-18 10:19:47 +01:00
vhost-scsi-common.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
vhost-scsi.c sysemu: Move the VMChangeStateEntry typedef to qemu/typedefs.h 2019-08-16 13:31:53 +02:00
vhost-user-scsi.c vhost-user-scsi: prevent using uninitialized vqs 2019-08-22 16:52:23 +01:00
viosrp.h hw: move private headers to hw/ subdirectories. 2013-04-08 18:13:16 +02:00
virtio-scsi-dataplane.c Replace '-enable-kvm' with '-accel kvm' in docs and help texts 2018-06-28 19:05:32 +02:00
virtio-scsi.c Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
vmw_pvscsi.c Include hw/qdev-properties.h less 2019-08-16 13:31:53 +02:00
vmw_pvscsi.h scsi: VMWare PVSCSI paravirtual device implementation 2013-04-19 10:44:17 +02:00