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# SPDX-License-Identifier: MIT
from construct import Struct, Int8ul, Int16ul, Int32sl, Int32ul, Int64ul
from subprocess import Popen, PIPE
import pathlib
import struct
import os
import sys
from ..utils import *
VirtioConfig = Struct(
"irq" / Int32sl,
"devid" / Int32ul,
"feats" / Int64ul,
"num_qus" / Int32ul,
"data" / Int64ul,
"data_len" / Int64ul,
"verbose" / Int8ul,
)
class VirtioDescFlags(Register16):
WRITE = 1
NEXT = 0
VirtioDesc = Struct(
"addr" / Int64ul,
"len" / Int32ul,
"flags" / RegAdapter(VirtioDescFlags),
"next" / Int16ul,
)
VirtioExcInfo = Struct(
"devbase" / Int64ul,
"qu" / Int16ul,
"idx" / Int16ul,
"pad" / Int32ul,
"descbase" / Int64ul,
)
class VirtioDev:
def __init__(self):
self.base, self.hv = None, None # assigned by HV object
def read_buf(self, desc):
return self.hv.iface.readmem(desc.addr, desc.len)
def read_desc(self, ctx, idx):
off = VirtioDesc.sizeof() * idx
return self.hv.iface.readstruct(ctx.descbase + off, VirtioDesc)
@property
def config_data(self):
return b""
@property
def devid(self):
return 0
@property
def num_qus(self):
return 1
@property
def feats(self):
return 0
class Virtio9PTransport(VirtioDev):
def __init__(self, tag="m1n1", root=None):
p_stdin, self.fin = os.pipe()
self.fout, p_stdout = os.pipe()
if root is None:
root = str(pathlib.Path(__file__).resolve().parents[3])
if type(tag) is str:
self.tag = tag.encode("ascii")
else:
self.tag = tag
self.p = Popen([
"u9fs",
"-a", "none", # no auth
"-n", # not a network conn
"-u", os.getlogin(), # single user
root,
], stdin=p_stdin, stdout=p_stdout, stderr=sys.stderr)
@property
def config_data(self):
return struct.pack("=H", len(self.tag)) + self.tag
@property
def devid(self):
return 9
@property
def num_qus(self):
return 1
@property
def feats(self):
return 1
def call(self, req):
os.write(self.fin, req)
resp = os.read(self.fout, 4)
length = int.from_bytes(resp, byteorder="little")
resp += os.read(self.fout, length - 4)
return resp
def handle_exc(self, ctx):
head = self.read_desc(ctx, ctx.idx)
assert not head.flags.WRITE
req = bytearray()
while not head.flags.WRITE:
req += self.read_buf(head)
if not head.flags.NEXT:
break
head = self.read_desc(ctx, head.next)
resp = self.call(bytes(req))
resplen = len(resp)
while len(resp):
self.hv.iface.writemem(head.addr, resp[:head.len])
resp = resp[head.len:]
if not head.flags.NEXT:
break
head = self.read_desc(ctx, head.next)
self.hv.p.virtio_put_buffer(ctx.devbase, ctx.qu, ctx.idx, resplen)
return True
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