b1323e193a
Xorg on a framebuffer -- the fbdev video driver, the evdev input driver, libpciaccess -- asks the kernel a fixed set of questions before it draws anything, and gives up on the first wrong answer. These are those answers. evdev: EVIOCGVERSION, GID, GNAME, GPHYS, GUNIQ, GPROP, GBIT, GKEY, GABS, GREP and the accepted setters. Xorg and libinput decide what a device *is* from the capability bitmaps; /dev/input/eventN answered only EVIOCGRAB, which reads as no device at all. Each device's bitmaps are its defaults plus whatever it has reported, so a USB tablet makes the pointer absolute. fbdev: FBIOPUT_VSCREENINFO succeeds for the mode already set, as on Linux -- the fbdev driver sets it every time it starts -- and still refuses any other. FBIOPAN_DISPLAY to the origin; FBIOBLANK. The console: KDSETMODE(KD_GRAPHICS) stops it drawing on a terminal, KDSKBMODE(K_OFF) stops keys reaching its tty, and VT_PROCESS now does the switch handshake: leaving the terminal sends relsig and waits for VT_RELDISP, arriving sends acqsig. A terminal whose owner has died goes back to the kernel whole, so a crashed X cannot leave the console dead. /sys: boot_vga, a writable enable, and graphics/fb0 under the display device, which is how the fbdev driver pairs a card with /dev/fb0. ports/linux-headers: <linux/*.h> into musl's prefix, from sabotage- linux's kernel-headers 4.19.88-2. Its checksum is recorded from the first download; upstream publishes none. cmd/xready makes each call and checks the answer, including the switch handshake on tty2 and an owner that dies holding it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
52 lines
2 KiB
Makefile
52 lines
2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-or-later
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# Linux's userspace headers -- GPL-2.0 WITH Linux-syscall-note, which is the
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# exception that makes them includable by anything: https://kernel.org/
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#
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# <linux/input.h>, <linux/fb.h>, <linux/kd.h>, <linux/vt.h> and the rest are
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# how a program spells the ioctls SchOS answers in Linux's numbering, and
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# Xorg, libevdev and libinput include them without asking whether the kernel
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# underneath is Linux. Taken from sabotage-linux's kernel-headers: the
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# headers alone, sanitised, a megabyte rather than a kernel tree.
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#
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# Installed into musl's prefix, next to libc's own, because that is where
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# every port already looks. Not scsi/: musl ships its own scsi/*.h, and these
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# would overwrite them. Nothing goes into sysroot/ -- headers are build input.
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include ../mk/port.mk
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LH_VERSION := 4.19.88-2
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LH_URL := https://github.com/sabotage-linux/kernel-headers/releases/download/v$(LH_VERSION)/linux-headers-$(LH_VERSION).tar.xz
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# Recorded on first download; upstream publishes no checksum to compare with.
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LH_SHA256 := dc7abf734487553644258a3822cfd429d74656749e309f2b25f09f4282e05588
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TARBALL := $(DISTDIR)/linux-headers-$(LH_VERSION).tar.xz
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STAMP := $(MUSL)/include/linux/input.h
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$(TARBALL): | $(DISTDIR)
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curl -fsSL -o $@ $(LH_URL)
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sh $(SHA256CHECK) "$(LH_SHA256)" "$@"
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download: $(TARBALL)
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$(SRCDIR): $(TARBALL)
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mkdir -p $(PORTDIR)
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rm -rf $@ $(PORTDIR)/linux-headers-$(LH_VERSION)
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tar -xJf $< -C $(PORTDIR)
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mv $(PORTDIR)/linux-headers-$(LH_VERSION) $@
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# A file in the prefix as the target, not a stamp here: musl's prefix is
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# rebuilt from scratch when musl is, and the headers have to come back with it.
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$(STAMP): | $(SRCDIR)
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test -d $(MUSL)/include || { echo "linux-headers: build musl first"; exit 1; }
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cd $(SRCDIR)/x86/include && for d in *; do \
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[ "$$d" = scsi ] && continue; \
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mkdir -p $(MUSL)/include/$$d && cp -R $$d/. $(MUSL)/include/$$d/; \
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done
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build install: $(STAMP)
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clean:
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rm -rf $(PORTDIR)
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distclean: clean
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rm -f $(TARBALL)
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