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snap install --classic go            # sudo apt -y install golang

go version
# go version go1.16.5 linux/amd64    # go version go1.13.8 linux/amd64

go get github.com/golang/example/hello

~/go/bin/hello
# Hello, Go examples!

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# apt snap
sudo apt update -y && \ 
    sudo apt -y install snapd curl && \ 
    sudo snap install intellij-idea-community --classic && \ 
    sudo snap install code --classic

# sdkman
sudo apt -y install git make autoconf g++ flex bison
curl -s "https://get.sdkman.io" | bash
source "$HOME/.sdkman/bin/sdkman-init.sh"

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Expand Ubuntu disk after Hyper-V Quick Create

It is quick and easy to use Hyper-V Quick Create to get an Ubuntu virtual machine running on a Windows 10 computer. However, if this method is used, you may end up with a tiny Ubuntu virtual disk that will not be useful for any serious work and it is less obvious than the initial setup how to increase the size of this disk.

These steps fix the problem:

1. Turn off the VM.

2. Hyper-V Manager Settings Virtual hard disk.

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#!/bin/bash

yosys -q -p "prep -top $1; write_json $1.json" $1.v
netlistsvg $1.json -o $1.svg

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/**
 * D flip-flop:
 * https://github.com/edaplayground/eda-playground/blob/master/docs/code-examples/d-flip-flop.rst
 */
module dff (clk, reset,
  d, q, qb);
  input      clk;
  input      reset;
  input      d;
  output     q;

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/* https://elixir.bootlin.com/linux/v5.14.13/source/fs/open.c#L1224 */

SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
{
	if (force_o_largefile())
		flags |= O_LARGEFILE;
	return do_sys_open(AT_FDCWD, filename, flags, mode);
}

#define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)

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/*
 ============================================================================
 Name        : branch_mispred.c
 Author      : John Demme
 Version     : Mar 21, 2011
 Description : A template for perf_event. Requires Linux 2.6.32 or higher
 ============================================================================
*/

#define _GNU_SOURCE

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/* https://elixir.bootlin.com/linux/v5.14.13/source/fs/open.c#L1224 */
SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
{
    if (force_o_largefile())
        flags |= O_LARGEFILE;
    return do_sys_open(AT_FDCWD, filename, flags, mode);
}

/* /include/linux/syscalls.h::SYSCALL_DEFINE3 */

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/* https://elixir.bootlin.com/linux/latest/source/tools/include/nolibc/nolibc.h#L2114 */
/* nolibc.h::open() */
static __attribute__((unused))
int open(const char *path, int flags, mode_t mode)
{
    int ret = sys_open(path, flags, mode);
    if (ret < 0) {
        SET_ERRNO(-ret);
        ret = -1;
    }

paranlee

/* arm64/include/asm/unistd32.h::__SYSCALL */
#undef __SYSCALL
#define __SYSCALL(nr, sym)	asmlinkage long __arm64_##sym(const struct pt_regs *);
#include <asm/unistd.h>

#undef __SYSCALL
#define __SYSCALL(nr, sym)	[nr] = __arm64_##sym,

/* arch/arm64/include/asm/unistd32.h::__NR_open */