c77841ce3d
SDL 3 has no OSS backend and SchOS has no ALSA kernel side, so sound now goes SDL -> alsa-lib -> alsa-plugins' OSS plugin -> /dev/dsp. That path found two bugs underneath it: - ac97: resetting the PCM-out box also clears the descriptor list address, and nothing set it again. Every stream after the first stop played a "list" at physical address 0 -- silence -- and ALSA resets before each stream. If the engine halts at the end of the queue, the run bit is set again. - /dev/dsp: SETFRAGMENT, GETFMTS, GETCAPS, SETTRIGGER, GETOPTR and GETODELAY for the plugin's ring-and-pointer model, and poll(), writable once a whole fragment fits (ALSA spun at 76% CPU otherwise). speaker-test now plays in real time at 0% CPU, verified in a recording of QEMU's AC'97. - /etc/asound.conf: the default device is a plug to the OSS device at 16-bit stereo 48 kHz, what every SchOS audio driver plays. Also: - getstackpcs: each frame link must go up the same stack by less than KSTACKSIZE. The chain ends at the syscall entry with the user's rbp, which lbreakouthd uses as a register (-1024); the walk dereferenced it under the syscall tracer and the kernel panicked inside acquire(). - fb: FBIOGET_VSCREENINFO reports nominal timings, as Linux's efifb does, instead of zeros, which Xorg's fbdev turned into a 0 Hz RandR mode. - procdump (Ctrl-P) shows where runnable threads are in user space. - World: lbreakouthd instead of lbreakout2 (its stk.c passes vsnprintf a size of 511 plus the prefix length, and Alpine's fortified headers trap on that), plus curl, alsa-lib and alsa-plugins. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
58 lines
2 KiB
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58 lines
2 KiB
Text
# Alpine packages built into the apk-managed root, one per line.
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#
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# Edit this, then run `make alpine-lock` to resolve it, with every dependency,
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# into world.lock -- exact versions and checksums. A normal build installs
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# exactly what world.lock says from dist/alpine/, downloading only files it
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# does not have yet, and never asks Alpine what is newer. That happens only
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# when you run `make alpine-lock` again.
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#
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# Anything else is one `apk add` away on the running system; this list is
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# what a fresh image starts with.
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# The login shell. Replaces SchOS's own zsh port.
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zsh
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# Terminal descriptions for zsh, htop, and everything else that draws.
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ncurses-terminfo-base
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# The PCI and USB ID databases: lspci, fastfetch and Xorg read them.
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hwdata-pci
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hwdata-usb
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# X on the framebuffer, with startx. /root/.xserverrc and .xinitrc (from
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# mkaroot.sh) start it with -dumbSched and run Window Maker in it.
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xorg-server
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xf86-video-fbdev
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xf86-input-evdev
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xinit
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# The desktop: Window Maker, a terminal for it, and a font for both.
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windowmaker
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xterm
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font-dejavu
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# Stress: terminal programs that draw, multiplex and poll. htop and btop read
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# /proc hard; tmux wants ptys, sockets and signals; mc does everything at once.
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htop
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btop
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tmux
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mc
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ncdu
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fastfetch
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# Games. In the terminal: nethack, the BSD set, and two toys. On X:
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# lbreakouthd (SDL 2) and the classic X clients. Not lbreakout2: its stk.c
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# hands vsnprintf a size of 511 + the prefix length, and Alpine's fortified
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# headers trap on that before it loads its first image -- on Alpine too.
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nethack
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bsd-games
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cmatrix
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sl
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lbreakouthd
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xeyes
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xclock
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xcalc
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# A browser: NetSurf, on GTK 3 -- glib's threads, cairo, pango, TLS. The step
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# before WebKit (epiphany), which is `apk add` away.
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netsurf
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# curl's command line; libcurl is already here for NetSurf.
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curl
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# Sound for everything that speaks ALSA, SDL included: alsa-lib with the OSS
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# plugin, pointed at /dev/dsp by schos-base's /etc/asound.conf. SchOS has OSS,
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# not ALSA's kernel side, and SDL 3 has no OSS backend of its own.
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alsa-lib
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alsa-plugins
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