rumpusbdisk: Add USB mass storage translator

This adds a second binary target to compile in
the rump USB stack instead of SATA/IDE using conditional
ifdefs to mostly share the code between the two translators.

This can be tested by running qemu with a USB3 controller as follows:

    -drive if=none,id=usbstick,format=raw,file=/path/to/disk.img \
    -device qemu-xhci                                            \
    -device usb-storage,drive=usbstick                           \

NB: /path/to/disk.img can be a block device on the host.

Then call grub module rumpusbdisk.static instead of rumpdisk.static
and pass ' root=part:X:device:sd0 noide' as gnumach parameters,
where X is the partition number of / within the disk/image.

Caveats: netdde seems to exhibit a bug when running 'ifdown /dev/eth0'
simultaneously to running the rumpusbdisk translator, due to
the two devices sharing the same IRQ.

Message-Id: <20230703101815.925760-1-damien@zamaudio.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/rumpdisk/main.c b/rumpdisk/main.c
index 64065c6c..ca166274 100644
--- a/rumpdisk/main.c
+++ b/rumpdisk/main.c
@@ -32,6 +32,12 @@
 #include <pthread.h>
 #include <mach.h>
 
+#ifdef _RUMP_SATA
+#define RUMPNAME "rumpdisk"
+#else
+#define RUMPNAME "rumpusbdisk"
+#endif
+
 mach_port_t bootstrap_resume_task = MACH_PORT_NULL;
 
 static const struct argp_option options[] = {
@@ -128,7 +134,7 @@ main (int argc, char **argv)
     }
 
   rump_register_block ();
-  machdev_trivfs_init (argc, argv, bootstrap_resume_task, "rumpdisk", "/dev/rumpdisk", &bootstrap);
+  machdev_trivfs_init (argc, argv, bootstrap_resume_task, RUMPNAME, "/dev/" RUMPNAME, &bootstrap);
 
   /* Make sure we will not swap out, in case we drive the disk used for
      swapping.  */