686d5cf006
Two bugs reported from actual use, plus a test harness that had stopped testing. init could be killed by Ctrl-C, taking the machine with it. SIGINT goes to the foreground process group, init is pgid 1, and any window where tty_fg_pgrp is 1 -- before a shell claims the terminal, after one exits, or between the two while the key is held -- lands it on init. init has no handler, so killed was set, exit() ran, and exit() panics outright on initproc. Spamming Ctrl-C at a frozen program is exactly the input that finds that window. POSIX and Linux both discard a default-action signal for pid 1; init_ignores() now does the same, SIGKILL included, because init is not killable from userspace on any Unix. Everything was slow because BSIZE was 1024 while a SchFS block is 4096, so every block cost four IDE requests, each with its own interrupt and sleep/wakeup. exec() of the 800 KB toybox binary meant ~800 round trips. The giveaway: `seq 1 200`, which touches no file and prints nothing, cost the same 2.0s as `cat /bin/toybox`, and `ls | wc -l` cost exactly double -- both dominated by loading the same binary twice. BSIZE is 4096 now, one request per SchFS block, and NBUF is 256 blocks (1 MB) rather than 90 KB -- smaller than the binary every command execs, so nothing was ever still resident. ideinit() issues SET MULTIPLE MODE, which is what makes a 4096-byte transfer legal: READ/WRITE MULTIPLE move the drive's multiple count per interrupt and nothing had ever set it, which is the real reason idestart() carried a sector_per_block > 7 panic. seq 1 200 2.02s -> 0.06s ls /bin 2.76s -> 0.68s ls /bin | wc -l 4.68s -> 0.73s And the harness. bootcheck called Find-Qemu from a param() default, which is bound before any function in the body exists -- so it died on its first line and printed an error containing neither "FAIL" nor "Exception", the two things being grepped for. It had not run since it was made host-portable. Worse, an earlier index-based edit had deleted the Expect blocks for -Tty, -Usb, -Sock, -Ps and -Evdev, so five of the seven modes asserted nothing at all. Restored, and the USB run gets its own 16 MB build/usbstick.img: it had been pointed at build/fs.img, which nothing builds since SchFS became root, so QEMU refused to start. 242 checks across seven modes, all passing, and make schfs-check green.
117 lines
4.4 KiB
PowerShell
117 lines
4.4 KiB
PowerShell
# Draw on /dev/fb0 and photograph the result.
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#
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# bootcheck -Fb proves fbinfo *ran* and that the numbers it read back are the
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# ones the bootloader programmed. It cannot prove the pixels landed where they
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# were meant to: a framebuffer written with the wrong stride still reports
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# every byte accepted, and the only symptom is a picture that shears
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# progressively down the screen. That is a thing you have to look at.
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#
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# tools/fbshot.ps1 gradient through mmap
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# tools/fbshot.ps1 -Mode bars colour bars through write()
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param(
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[ValidateSet('fill', 'bars')]
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[string]$Mode = 'fill',
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[int]$BootSeconds = 20,
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[string]$Qemu
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)
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# QEMU, on whichever host this is.
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#
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# PowerShell 7 runs on Linux, macOS and the BSDs as well as Windows, so these
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# scripts are usable from all of them -- but the old default was a hardcoded
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# scoop path under $env:USERPROFILE, which exists on exactly one of those. PATH
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# first, because a package-managed qemu is on it everywhere; the scoop location
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# is only a fallback for the Windows install that does not add itself to PATH.
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function Find-Qemu {
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$exe = if ($IsWindows -or $env:OS -eq 'Windows_NT') { 'qemu-system-x86_64.exe' }
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else { 'qemu-system-x86_64' }
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$onPath = Get-Command $exe -ErrorAction SilentlyContinue
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if ($onPath) { return $onPath.Source }
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if ($env:USERPROFILE) {
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$scoop = Join-Path (Join-Path $env:USERPROFILE 'scoop/apps/qemu/current') $exe
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if (Test-Path $scoop) { return $scoop }
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}
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foreach ($p in @('/usr/bin', '/usr/local/bin', '/opt/homebrew/bin')) {
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$c = Join-Path $p $exe
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if (Test-Path $c) { return $c }
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}
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throw "qemu-system-x86_64 not found on PATH. Install QEMU, or pass -Qemu <path>."
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}
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if (-not $Qemu) { $Qemu = Find-Qemu }
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$ErrorActionPreference = 'Stop'
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# Repo root is two levels up: this script lives in tools/windows/.
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$root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
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$hda = Join-Path $root 'schos.img'
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# The root filesystem. SchFS is the only root there is: the kernel mounts
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# device 1 in forkret() and panics if it is not a SchFS volume, so this is
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# not a choice and there is no -SchFS switch any more. It used to default to
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# build/fs.img, which stopped being bootable the moment SchFS became root.
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$hdb = Join-Path $root 'build/schfs.img'
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$log = Join-Path $root 'build/fbshot.log'
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$ppm = Join-Path $root "build/fb-$Mode.ppm"
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Remove-Item -Force $log, $ppm -ErrorAction SilentlyContinue
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$monPort = 55556 # not crashshot's 55555, so the two can run back to back
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$psi = New-Object System.Diagnostics.ProcessStartInfo
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$psi.FileName = $Qemu
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$psi.Arguments = @(
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"-drive file=`"$hda`",format=raw,index=0,media=disk"
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"-drive file=`"$hdb`",format=raw,index=1,media=disk"
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'-m 1G -smp 1 -cpu qemu64,+rdtscp -machine pc-i440fx-9.2'
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'-display none'
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"-chardev stdio,id=c0,logfile=`"$log`""
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'-serial chardev:c0'
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"-monitor tcp:127.0.0.1:$monPort,server,nowait"
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) -join ' '
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$psi.RedirectStandardInput = $true
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$psi.UseShellExecute = $false
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Write-Host "==> booting" -ForegroundColor Cyan
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$p = [System.Diagnostics.Process]::Start($psi)
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function Send-Line($text) {
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foreach ($ch in ($text + "`n").ToCharArray()) {
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$p.StandardInput.Write($ch)
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$p.StandardInput.Flush()
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Start-Sleep -Milliseconds 30 # serial has no flow control
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}
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}
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try {
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Start-Sleep -Seconds $BootSeconds
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Write-Host " > fbinfo $Mode" -ForegroundColor DarkGray
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Send-Line "fbinfo $Mode"
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Start-Sleep -Seconds 8 # 1.9 MB a pixel at a time is not fast
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Write-Host "==> capturing the framebuffer" -ForegroundColor Cyan
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$client = New-Object System.Net.Sockets.TcpClient('127.0.0.1', $monPort)
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$writer = New-Object System.IO.StreamWriter($client.GetStream())
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$writer.AutoFlush = $true
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Start-Sleep -Milliseconds 500
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$writer.WriteLine("screendump $ppm")
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Start-Sleep -Seconds 2
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$writer.WriteLine('quit')
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Start-Sleep -Milliseconds 500
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$client.Close()
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} finally {
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if (-not $p.HasExited) { $p.Kill() }
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Start-Sleep -Milliseconds 800
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}
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if (Test-Path $log) {
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$text = Get-Content $log -Raw
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$idx = $text.IndexOf('fbinfo')
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if ($idx -ge 0) { Write-Host $text.Substring($idx) }
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}
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if (Test-Path $ppm) {
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Write-Host "==> $ppm ($((Get-Item $ppm).Length) bytes)" -ForegroundColor Green
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} else {
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Write-Host 'FAIL: no screendump was produced' -ForegroundColor Red
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exit 1
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}
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