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The Itanium architecture is obsolete, and an informal survey [0] reveals that any residual use of Itanium hardware in production is mostly HP-UX or OpenVMS based. The use of Linux on Itanium appears to be limited to enthusiasts that occasionally boot a fresh Linux kernel to see whether things are still working as intended, and perhaps to churn out some distro packages that are rarely used in practice. None of the original companies behind Itanium still produce or support any hardware or software for the architecture, and it is listed as 'Orphaned' in the MAINTAINERS file, as apparently, none of the engineers that contributed on behalf of those companies (nor anyone else, for that matter) have been willing to support or maintain the architecture upstream or even be responsible for applying the odd fix. The Intel firmware team removed all IA-64 support from the Tianocore/EDK2 reference implementation of EFI in 2018. (Itanium is the original architecture for which EFI was developed, and the way Linux supports it deviates significantly from other architectures.) Some distros, such as Debian and Gentoo, still maintain [unofficial] ia64 ports, but many have dropped support years ago. While the argument is being made [1] that there is a 'for the common good' angle to being able to build and run existing projects such as the Grid Community Toolkit [2] on Itanium for interoperability testing, the fact remains that none of those projects are known to be deployed on Linux/ia64, and very few people actually have access to such a system in the first place. Even if there were ways imaginable in which Linux/ia64 could be put to good use today, what matters is whether anyone is actually doing that, and this does not appear to be the case. There are no emulators widely available, and so boot testing Itanium is generally infeasible for ordinary contributors. GCC still supports IA-64 but its compile farm [3] no longer has any IA-64 machines. GLIBC would like to get rid of IA-64 [4] too because it would permit some overdue code cleanups. In summary, the benefits to the ecosystem of having IA-64 be part of it are mostly theoretical, whereas the maintenance overhead of keeping it supported is real. So let's rip off the band aid, and remove the IA-64 arch code entirely. This follows the timeline proposed by the Debian/ia64 maintainer [5], which removes support in a controlled manner, leaving IA-64 in a known good state in the most recent LTS release. Other projects will follow once the kernel support is removed. [0] https://lore.kernel.org/all/CAMj1kXFCMh_578jniKpUtx_j8ByHnt=s7S+yQ+vGbKt9ud7+kQ@mail.gmail.com/ [1] https://lore.kernel.org/all/0075883c-7c51-00f5-2c2d-5119c1820410@web.de/ [2] https://gridcf.org/gct-docs/latest/index.html [3] https://cfarm.tetaneutral.net/machines/list/ [4] https://lore.kernel.org/all/87bkiilpc4.fsf@mid.deneb.enyo.de/ [5] https://lore.kernel.org/all/ff58a3e76e5102c94bb5946d99187b358def688a.camel@physik.fu-berlin.de/ Acked-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _I8042_H
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#define _I8042_H
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/*
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* Copyright (c) 1999-2002 Vojtech Pavlik
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*/
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/*
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* Arch-dependent inline functions and defines.
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*/
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#if defined(CONFIG_MACH_JAZZ)
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#include "i8042-jazzio.h"
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#elif defined(CONFIG_SGI_HAS_I8042)
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#include "i8042-ip22io.h"
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#elif defined(CONFIG_SNI_RM)
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#include "i8042-snirm.h"
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#elif defined(CONFIG_SPARC)
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#include "i8042-sparcio.h"
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#elif defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
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#include "i8042-acpipnpio.h"
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#else
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#include "i8042-io.h"
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#endif
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/*
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* This is in 50us units, the time we wait for the i8042 to react. This
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* has to be long enough for the i8042 itself to timeout on sending a byte
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* to a non-existent mouse.
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*/
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#define I8042_CTL_TIMEOUT 10000
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/*
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* Return codes.
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*/
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#define I8042_RET_CTL_TEST 0x55
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/*
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* Expected maximum internal i8042 buffer size. This is used for flushing
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* the i8042 buffers.
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*/
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#define I8042_BUFFER_SIZE 16
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/*
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* Number of AUX ports on controllers supporting active multiplexing
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* specification
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*/
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#define I8042_NUM_MUX_PORTS 4
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/*
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* Debug.
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*/
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#ifdef DEBUG
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static unsigned long i8042_start_time;
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#define dbg_init() do { i8042_start_time = jiffies; } while (0)
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#define dbg(format, arg...) \
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do { \
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if (i8042_debug) \
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printk(KERN_DEBUG KBUILD_MODNAME ": [%d] " format, \
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(int) (jiffies - i8042_start_time), ##arg); \
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} while (0)
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#define filter_dbg(filter, data, format, args...) \
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do { \
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if (!i8042_debug) \
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break; \
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\
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if (!filter || i8042_unmask_kbd_data) \
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dbg("%02x " format, data, ##args); \
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else \
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dbg("** " format, ##args); \
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} while (0)
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#else
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#define dbg_init() do { } while (0)
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#define dbg(format, arg...) \
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do { \
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if (0) \
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printk(KERN_DEBUG pr_fmt(format), ##arg); \
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} while (0)
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#define filter_dbg(filter, data, format, args...) do { } while (0)
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#endif
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#endif /* _I8042_H */
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