Author Archives: mzh

multi-instance udp2raw configuration for openwrt

/etc/config/udp2raw

config udp2raw foo
        option enable '1'
        option run_command '-c -l 127.0.0.1:55820 -r foo_ip:80 -k <bar_password> --raw-mode faketcp -a'

config udp2raw bar
        option enable '1'
        option run_command '-c -l 127.0.0.1:55821 -r bar_ip:80 -k <bar_password> --raw-mode faketcp -a'

/etc/init.d/udp2raw

#!/bin/sh /etc/rc.common

USE_PROCD=1

START=99
STOP=01

PROG=/usr/bin/udp2raw

_log() {
        logger -p daemon.info -t udp2raw "$@"
}

_err() {
        logger -p daemon.err -t udp2raw "$@"
}

start_service() {
    config_load "udp2raw"
    config_foreach start_instance udp2raw
}

start_instance() {
    config_get run_command "$1" 'run_command'
    _log "start instance $1 with $run_command"
    procd_open_instance "udp2raw_$1"
    procd_set_param command $PROG
    procd_append_param command $run_command
    procd_set_param stdout 1
    procd_set_param stderr 1
    procd_close_instance
}

reload_service() {
    stop
    start
}

service_triggers() {
    procd_add_reload_trigger udp2raw
}

Now, service udp2raw start

Caddy docker now support riscv64!

Caddy docker now supported riscv64 by default!

You can install and run simply by docker run --rm -d -p 8080:80 --name web caddy

What is caddy?
Caddy acts as an enterprise-grade web server with automatic HTTPS. Other servers don’t share this same feature out of the box.

Pull request that makes it possible!
https://github.com/caddyserver/caddy/issues/6331
https://github.com/caddyserver/xcaddy/pull/185
https://github.com/caddyserver/caddy-docker/pull/358

Installing OpenBSD 7.4 on a MilkV Mars

Here are some instructions for getting OpenBSD 74 running on a MilkV Mars (V1.11).

You will need:

  1. SD card at least 8GB
  2. An USB TTL serial adapter
  3. A second machine to interact with the MilkV Mars over serial
  4. An Ehternet cable and able connection to a tftp server

The original idea came from " Installing OpenBSD 7.3-current on a VisionFive2" , You can also check this instruction for references.

Steps

  1. Download miniroot.img 7.4 from OpenBSD.
  2. Donwload special DTB made by jh7110-starfive-visionfive-2-v1.3b.dtb and upload it to tftp server (my are 10.0.0.21)
  3. Flash this miniroot.img into SD card
  4. Boot the Mars and hit any key during U-Boot, now you can hit any keys during boot up
--------EEPROM INFO--------

In:    serial
Out:   serial
Err:   serial
Model: Milk-V Mars
Net:   eth0: ethernet@16030000, eth1: ethernet@16040000
switch to partitions #0, OK
mmc1 is current device
found device 1
bootmode flash device 1
** Invalid partition 3 **
Couldn't find partition mmc 1:3
Can't set block device
** Invalid partition 3 **
Couldn't find partition mmc 1:3
Can't set block device
Hit any key to stop autoboot:  0
StarFive #
  1. Uboot setup ip and load DTB file by
dhcp; setenv serverip 10.0.0.21; tftpboot ${fdt_addr_r} jh7110-starfive-visionfive-2-v1.3b.dtb

load mmc 1:1 ${kernel_addr_r} efi/boot/bootriscv64.efi; bootefi ${kernel_addr_r} ${fdt_addr_r}
  1. That's It! Now you can boot with OpenBSD and do install by normal process

OpenBSD 7.4 on MilkV Mars

p.s. In OpenBSD sysctl hw.perfpolicy=high to enable performance mode.

Go riscv64 FMA optimazation notes

FMA, which is short for fused multiply–add, use lots by math in Go compiler and standard library.
I found that Go 1.20 did some riscv64 support for FMA, however, when I'm trying to add test cases for FNMA x * y - z or FNMS -x * y + z.
The binary output always different with my expectation and test cases in math always failed.

At first, I thought that is floating point error since floating point number follows IEEE-754, 2008 edition which allows minor errors within 1e-16 i.e. "veryclose" in math test cases.
However, when I implement the same algorithm for 32 bits FP, there is far more error than it should be.

After my carefully search on SSA code generator, I found that FMA SSA for riscv64 will invert FMA into FNMX if multiplier or adder is negative.

(F(MADD|NMADD|MSUB|NMSUB)D neg:(FNEGD x) y z) && neg.Uses == 1 => (F(NMADD|MADD|NMSUB|MSUB)D x y z)

This SSA will convert FMADDD into FNMADD, unfortunately according to RISCV manual, this is wrong.
In the manual
FMADD means

x * y + z

FNMADD means

 - x * y - z

instead of original CL thought FNMADD should be implemented as

x * y - z

Then I commit a CL that fix this issue for good with some test cases.
https://go-review.googlesource.com/c/go/+/506575

原神 x 编程: 基于丘丘语的编程语言MITA

各位旅行者好~ Olah Odomu!

著名丘丘语言学家,艾拉马斯克,在近日的研究中发现丘丘人正在通过一种特殊的编程语言试图重新控制提瓦特大陆上的遗迹守卫。他们的目的尚不明确,且此语言仍是草稿阶段,因此,暂时定名为 MITA ( Machine Instruction for Teyvat Automaton )意为“提瓦特自律机关机器指令”。

艾拉马斯克试着将其抄写出来并使用了地球科技 Go 语言进行了实现并分享在了 Github 上。

https://github.com/mitalang/mita

https://ngabbs.com/read.php?tid=39515586

例如,布尔值:

真(肯定) da
假(否定) nye

部分自然数

1 unu
2 du
3 unu du
4 du du
5 mani

由于丘丘语没有很多人类自然语言对应的抽象概念,而 “多个丘丘语单词可以组合成一个词组,以表达新的概念。丘丘语还有类似古汉语的词类活用现象,一个单词在不同语境下可以作名词或形容词”[1],我们可以对需要构建的词做出组合调整。因此该编程语言可能会在丘丘语研究员“艾拉 马斯克”有新研究后给出相应调整。

  • upa 汇聚, 即LISP中的“拼接”关键字 cons
  • muhe 想要,喜欢,即“想要特定功能”,可以设定成函数定义的抽象定义(defn
  • lawa 首领,可推导出“第一个”的意思,名词做动词,“取第一个”
  • kucha 弱小,既然不是第一,那就是剩下的东西,“取剩下的”
  • celi 火,因celi upa指代太阳,名做动理解成“升起”,可代替数学的“加”
  • movo 风、移动,可代替数学的“减”
  • shato 相似?,四舍五入就是等于
  • nyeshato 否定+相似(自造),不等于
  • abaabashato,时间在之前,套用过来就是小于,加上shato就是小于等于
  • untauntashato,时间在之后,套用过来就是大于,加上shato就是大于等于

她表示MITA中语法部分最独特是 lakucha ,大家都知道 lawa 在丘丘语中为首领的意思,而 kucha 为弱者(引申为随从),而当 lakucha 组合起来后,就形成了先取第一个元素( sada )再取后面的元素。

(lalalakukucha '((1 2) (3 4) ((5 6)) (7 8)))

将返回 5

其他更有趣的例如斐波那契数列,但由于丘丘语没有 0 的表达,因此艾拉本人还是使用了人类的 0.

(muhe(
        (yafib (mita (si)
                (dala ((shato si 0) 0)
                        (da (dala ((aba si du) unu)
                                (da (celi (yafib(movo si du)) (yafib(movo si unu))))
                        ))
                )
        ))
))

好了,目前就是艾拉的发现的MITA语言,欢迎大家移步项目地址进行讨论,mita dada!