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m1n1/proxyclient/tools/freebsd.py

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#!/usr/bin/env python3
# SPDX-License-Identifier: MIT
import sys, pathlib
import serial
sys.path.append(str(pathlib.Path(__file__).resolve().parents[1]))
import argparse, pathlib
# FreeBSD's setup differs from Linux's in the following primary ways:
#
# 1.) We pretend our kernel is an initramfs and pick it up as such in a modified
# loader build. This is the simplest way to avoid having ad-hoc
# interpretations of stuff in m1n1 for our quirky development setup.
#
# 2.) U-Boot and dtb are required, loader/kernel are not. The latter are
# assumed to be discoverable by the standard U-Boot process on disk if they
# are not specified. Otherwise, we'll load them from memory if they are
# provided.
#
parser = argparse.ArgumentParser(description='(FreeBSD) kernel loader for m1n1')
parser.add_argument('u_boot', type=pathlib.Path, help="load u-boot before linux")
parser.add_argument('dtb', type=pathlib.Path)
parser.add_argument('-l', '--loader', type=pathlib.Path)
parser.add_argument('-k', '--kernel', type=pathlib.Path)
parser.add_argument('-b', '--bootargs', type=str, metavar='"boot arguments"')
parser.add_argument('-t', '--tty', type=str)
args = parser.parse_args()
from m1n1.setup import *
if args.tty is not None:
tty_dev = serial.Serial(args.tty)
tty_dev.reset_input_buffer()
tty_dev.baudrate = 1500000
else:
tty_dev = None
if args.loader is not None:
loader = args.loader.read_bytes()
loader_size = len(loader)
else:
loader = None
loader_size = 0
dtb = args.dtb.read_bytes()
if args.kernel is not None:
kernel = args.kernel.read_bytes()
kernel_size = len(kernel)
else:
kernel = None
kernel_size = 0
if args.bootargs is not None:
print('Setting boot args: "{}"'.format(args.bootargs))
p.kboot_set_chosen("bootarg", args.bootargs)
dtb_addr = u.malloc(len(dtb))
print("Loading DTB to 0x%x..." % dtb_addr)
iface.writemem(dtb_addr, dtb)
loader_base = u.memalign(2 * 1024 * 1024, loader_size)
print("loader_base: 0x%x" % loader_base)
assert not (loader_base & 0xffff)
if kernel is not None:
kernel_base = u.memalign(65536, kernel_size)
print("Loading %d kernel bytes to 0x%x..." % (kernel_size, kernel_base))
iface.writemem(kernel_base, kernel, True)
p.kboot_set_initrd(kernel_base, kernel_size)
uboot = bytearray(args.u_boot.read_bytes())
uboot_size = len(uboot)
uboot_addr = u.memalign(2*1024*1024, len(uboot))
print("Loading u-boot to 0x%x..." % uboot_addr)
bootenv_start = uboot.find(b"bootcmd=run distro_bootcmd")
bootenv_len = uboot[bootenv_start:].find(b"\x00\x00")
bootenv_old = uboot[bootenv_start:bootenv_start+bootenv_len]
bootenv = str(bootenv_old, "ascii").split("\x00")
bootenv = list(filter(lambda x: not (x.startswith("baudrate") or (x.startswith("boot_") and not x.startswith("boot_efi_")) or x.startswith("distro_bootcmd")), bootenv))
if loader is not None:
# dtb_addr not used here, the prepared fdt's at a different location. If
# we use this one, we won't get any of our /chosen additions, for instance.
bootcmd = "distro_bootcmd=bootefi 0x%x - 0x%x" % (loader_base, loader_size)
else:
bootcmd = "distro_bootcmd=devnum=0; run usb_boot"
if tty_dev is not None:
bootenv.append("baudrate=%d" % tty_dev.baudrate)
bootenv.append(bootcmd)
if args.bootargs is not None:
bootenv.append("bootargs=" + args.bootargs)
bootenv_new = b"\x00".join(map(lambda x: bytes(x, "ascii"), bootenv))
bootenv_new = bootenv_new.ljust(len(bootenv_old), b"\x00")
if len(bootenv_new) > len(bootenv_old):
raise Exception("New bootenv cannot be larger than original bootenv")
uboot[bootenv_start:bootenv_start+bootenv_len] = bootenv_new
u.compressed_writemem(uboot_addr, uboot, True)
p.dc_cvau(uboot_addr, uboot_size)
p.ic_ivau(uboot_addr, uboot_size)
boot_addr = uboot_addr
p.smp_start_secondaries()
if p.kboot_prepare_dt(dtb_addr):
print("DT prepare failed")
sys.exit(1)
iface.dev.timeout = 40
if loader is not None:
print("Loading %d bytes to 0x%x..0x%x..." % (loader_size, loader_base, loader_base + loader_size))
iface.writemem(loader_base, loader, True)
p.dc_cvau(loader_base, loader_size)
p.ic_ivau(loader_base, loader_size)
print("Ready to boot")
daif = u.mrs(DAIF)
daif = 0xc0
u.msr(DAIF, daif)
print("DAIF: %x" % daif)
p.kboot_boot(boot_addr)
iface.ttymode(tty_dev)