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/Documentation/admin-guide/
Drtc.rst8 the local time zone or daylight savings time -- unless they dual boot
9 with MS-Windows -- but will instead be set to Coordinated Universal Time
12 The newest non-PC hardware tends to just count seconds, like the time(2)
16 Linux has two largely-compatible userspace RTC API families you may
19 * /dev/rtc ... is the RTC provided by PC compatible systems,
20 so it's not very portable to non-x86 systems.
25 Programmers need to understand that the PC/AT functionality is not
30 IRQ, so they can't all issue alarms; and where standard PC RTCs can
35 Old PC/AT-Compatible driver: /dev/rtc
36 --------------------------------------
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Dparport.rst4 The ``parport`` code provides parallel-port support under Linux. This
16 port-sharing) and architecture-dependent (which deals with actually
28 architecture-dependent code with (for example)::
32 to tell the ``parport`` code that you want three PC-style ports, one at
34 auto-detected IRQ. Currently, PC-style (``parport_pc``), Sun ``bpp``,
43 --------
60 ------------------------
68 parport0: Printer, BJC-210 (Canon)
83 to add. Adding ``parport=0`` to the kernel command-line will disable
85 command-line will make ``parport`` use any IRQ lines or DMA channels that
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Dspkguide.txt16 Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
25 http://linux-speakup.org/. Speakup is a set of patches to the standard
72 acntsa -- Accent SA
73 acntpc -- Accent PC
74 apollo -- Apollo
75 audptr -- Audapter
76 bns -- Braille 'n Speak
77 dectlk -- DecTalk Express (old and new, db9 serial only)
78 decext -- DecTalk (old) External
79 dtlk -- DoubleTalk PC
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/Documentation/timers/
Dtimers-howto.rst2 delays - Information on the various kernel delay / sleep mechanisms
14 ----------------
30 udelay is the generally preferred API; ndelay-level
31 precision may not actually exist on many non-PC devices.
38 NON-ATOMIC CONTEXT:
45 -- Backed by busy-wait loop:
49 -- Backed by hrtimers:
53 -- Backed by jiffies / legacy_timers
66 - Why not usleep?
67 On slower systems, (embedded, OR perhaps a speed-
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/Documentation/devicetree/bindings/usb/
Dusb-hcd.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/usb/usb-hcd.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Greg Kroah-Hartman <gregkh@linuxfoundation.org>
13 - $ref: usb.yaml#
20 tpl-support:
23 targeted hosts (non-PC hosts).
26 "#address-cells":
29 "#size-cells":
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/Documentation/arch/arm64/
Dtagged-pointers.rst20 --------------------------------------
25 (Documentation/arch/arm64/tagged-address-abi.rst).
29 - pointer arguments to system calls, including pointers in structures
32 - the stack pointer (sp), e.g. when interpreting it to deliver a
35 - the frame pointer (x29) and frame records, e.g. when interpreting
38 Using non-zero address tags in any of these locations when the
44 passing non-zero address tags to the kernel via system calls is
45 forbidden, and using a non-zero address tag for sp is strongly
48 Programs maintaining a frame pointer and frame records that use non-zero
54 ---------------
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/Documentation/translations/it_IT/i2c/
Dsummary.rst10 poca banda. Alcuni sistemi usano varianti che non rispettano i requisiti
11 originali, per cui non sono indicati come I2C, ma hanno nomi diversi, per
14 L'ultima specifica ufficiale I2C è la `"Specifica I2C-bus e manuale utente"
20 https://www.nxp.com/docs/en/user-guide/UM10204.pdf>`_.
25 oltre quanto richiesto da I2C. Le moderne schede madri dei PC si affidano a
31 possiamo farne uso su molti sistemi I2C. Ci sono però sistemi che non
32 soddisfano i vincoli elettrici sia di SMBus che di I2C; e altri che non possono
42 .. kernel-figure:: ../../../i2c/i2c_bus.svg
/Documentation/networking/device_drivers/ethernet/cirrus/
Dcs89x0.rst1 .. SPDX-License-Identifier: GPL-2.0
33 2.1 CS8900-based Adapter Configuration
34 2.2 CS8920-based Adapter Configuration
46 5.2.1 Diagnostic Self-Test
66 The CS8900-based ISA Ethernet Adapters from Cirrus Logic follow
67 IEEE 802.3 standards and support half or full-duplex operation in ISA bus
69 in 16-bit ISA or EISA bus expansion slots and are available in
70 10BaseT-only or 3-media configurations (10BaseT, 10Base2, and AUI for 10Base-5
73 CS8920-based adapters are similar to the CS8900-based adapter with additional
85 or loaded at run-time as a device driver module.
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/Documentation/dev-tools/
Dkfence.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Kernel Electric-Fence (KFENCE)
7 Kernel Electric-Fence (KFENCE) is a low-overhead sampling-based memory safety
8 error detector. KFENCE detects heap out-of-bounds access, use-after-free, and
9 invalid-free errors.
15 non-production test workloads. One way to quickly achieve a large enough total
19 -----
26 ``kfence.sample_interval`` to non-zero value), configure the kernel with::
46 causes CPU wake-ups when the system is completely idle. This may be undesirable
47 on power-constrained systems. The boot parameter ``kfence.deferrable=1``
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/Documentation/PCI/
Dacpi-info.rst1 .. SPDX-License-Identifier: GPL-2.0
39 If the OS is expected to manage a non-discoverable device described via
50 These are all device-specific, non-architected things, so the only way a
52 the device-specific details. The host bridge registers also include ECAM
66 bridge registers (including ECAM space) in PNP0C02 catch-all devices [6].
67 With the exception of ECAM, the bridge register space is device-specific
78 PNP0C02 "motherboard" devices are basically a catch-all. There's no
89 the address space is device-specific. An ACPI OS learns the base address
92 The MCFG table must describe the ECAM space of non-hot pluggable host
95 hot-pluggable host bridge [9]. Note that for both MCFG and _CBA, the base
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/Documentation/virt/kvm/arm/
Dpkvm.rst1 .. SPDX-License-Identifier: GPL-2.0
7 ------------
9 Protected KVM (pKVM) is a KVM/arm64 extension which uses the two-stage
12 without relying on whizz-bang features in hardware, but still allowing room for
13 complementary technologies such as memory encryption and hardware-backed
19 introduced to manage manipulation of guest stage-2 page tables, creation of VM
22 at stage-2, providing the hypervisor code with a mechanism to restrict host
26 -------------
29 "``kvm-arm.mode=protected``" on the command-line. Once enabled, VMs can be spawned
30 in either protected or non-protected state, although the hypervisor is still
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/Documentation/devicetree/bindings/arm/
Dpmu.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Mark Rutland <mark.rutland@arm.com>
11 - Will Deacon <will.deacon@arm.com>
16 representation in the device tree should be done as under:-
21 - enum:
22 - apm,potenza-pmu
23 - apple,avalanche-pmu
24 - apple,blizzard-pmu
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/Documentation/bpf/standardization/
Dinstruction-set.rst27 BCP 14 `<https://www.rfc-editor.org/info/rfc2119>`_
28 `<https://www.rfc-editor.org/info/rfc8174>`_
38 -----
51 .. table:: Meaning of bit-width notation
63 For example, `u32` is a type whose valid values are all the 32-bit unsigned
64 numbers and `s16` is a type whose valid values are all the 16-bit signed
68 ---------
70 The following byteswap functions are direction-agnostic. That is,
74 * be16: Takes an unsigned 16-bit number and converts it between
75 host byte order and big-endian
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/Documentation/translations/it_IT/process/
D1.Intro.rst1 .. include:: ../disclaimer-ita.rst
12 ------------------
22 una licenza GPL-compatibile.
66 ------------------------------
72 che fanno funzionare piccoli riproduttori musicali, PC, grandi super computer
89 Linux ed influenzarne la direzione di sviluppo. Prodotti non open-source non
96 Lavorare con la comunità di sviluppo del kernel non è particolarmente
101 di stringhe di codice sono modificate ogni giorni. Quindi non deve sorprendere
107 e solide esperienze. Uno sviluppatore che non comprende i modi della comunità
110 a coloro che cercano di imparare, ha poco tempo da dedicare a coloro che non
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Dchanges.rst1 .. include:: ../disclaimer-ita.rst
25 **almeno** alla versione indicata! Se non siete certi della versione che state
29 non tutti gli strumenti sono necessari ovunque; ovviamente, se non avete una
30 PC Card, per esempio, probabilmente non dovreste preoccuparvi di pcmciautils.
35 GNU C 5.1 gcc --version
36 Clang/LLVM (optional) 13.0.0 clang --version
37 Rust (opzionale) 1.76.0 rustc --version
38 bindgen (opzionale) 0.65.1 bindgen --version
39 GNU make 3.81 make --version
40 bash 4.2 bash --version
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/Documentation/driver-api/gpio/
Dintro.rst17 A "General Purpose Input/Output" (GPIO) is a flexible software-controlled
25 System-on-Chip (SOC) processors heavily rely on GPIOs. In some cases, every
26 non-dedicated pin can be configured as a GPIO; and most chips have at least
31 Most PC southbridges have a few dozen GPIO-capable pins (with only the BIOS
36 - Output values are writable (high=1, low=0). Some chips also have
38 value might be driven, supporting "wire-OR" and similar schemes for the
41 - Input values are likewise readable (1, 0). Some chips support readback
42 of pins configured as "output", which is very useful in such "wire-OR"
44 input de-glitch/debounce logic, sometimes with software controls.
46 - Inputs can often be used as IRQ signals, often edge triggered but
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/Documentation/bpf/
Dverifier.rst32 After kernel function call, R1-R5 are reset to unreadable and
35 Since R6-R9 are callee saved, their state is preserved across the call.
72 stack bounds, which are [-MAX_BPF_STACK, 0). In this example offset is 8,
78 Classic BPF verifier does similar check with M[0-15] memory slots.
81 bpf_ld R0 = *(u32 *)(R10 - 4)
85 Though R10 is correct read-only register and has type PTR_TO_STACK
86 and R10 - 4 is within stack bounds, there were no stores into that location.
88 Pointer register spill/fill is tracked as well, since four (R6-R9)
91 Allowed function calls are customized with bpf_verifier_ops->get_func_proto()
137 skb->data.
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/Documentation/input/devices/
Djoystick-parport.rst3 .. _joystick-parport:
9 :Copyright: |copy| 1998-2000 Vojtech Pavlik <vojtech@ucw.cz>
10 :Copyright: |copy| 1998 Andree Borrmann <a.borrmann@tu-bs.de>
18 Any information in this file is provided as-is, without any guarantee that
30 both output and input bits is the most suitable port on the PC for
36 Many console and 8-bit computer gamepads and joysticks are supported. The
40 ------------
44 connect to a PC, and don't need much processing speed (108 us for NES and
45 165 us for SNES, compared to about 1000 us for PC gamepads) to communicate
57 The main problem with PC parallel ports is that they don't have +5V power
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/Documentation/networking/device_drivers/cable/
Dsb1000.rst1 .. SPDX-License-Identifier: GPL-2.0
10 It's a one-way downstream-only cable modem, meaning that your upstream net link
36 - http://web.archive.org/web/%2E/http://home.adelphia.net/~siglercm/sb1000.html
37 - http://web.archive.org/web/%2E/http://linuxpower.cx/~cable/
84 6. Download the original file sb1000-1.1.2.tar.gz from Franco's site or one of
86 and do a ``make cmconfig`` and then ``install -c cmconfig /usr/local/sbin``.
92 already in there. Then modify ppp@gi-on to set the correct login name,
93 phone number, and frequency for the cable modem. Also edit pap-secrets
94 to specify your login name and password and any site-specific information
106 9. Start the PPP connection via the script /etc/ppp/ppp@gi-on. You must be
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/Documentation/trace/coresight/
Dcoresight.rst2 Coresight - HW Assisted Tracing on ARM
9 ------------
38 0 CPU 0<-->: C : 0 CPU 0<-->: C : : C : @ STM @ || System ||
39 |->0000000 : T : |->0000000 : T : : T :<--->@@@@@ || Memory ||
40 | #######<-->: I : | #######<-->: I : : I : @@@<-| ||||||||||||
43 | |->### | ! | |->### | ! | ! . | || DAP ||
49 *****************************************************************<-|
63 | * ===== F =====<---------|
65 |-->:: CTI ::<!! === N ===
69 |------>&& ETB &&<......II I =======
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/Documentation/admin-guide/media/
Dbttv.rst1 .. SPDX-License-Identifier: GPL-2.0
8 ----------------------
12 ./scripts/config -e PCI
13 ./scripts/config -m I2C
14 ./scripts/config -m INPUT
15 ./scripts/config -m MEDIA_SUPPORT
16 ./scripts/config -e MEDIA_PCI_SUPPORT
17 ./scripts/config -e MEDIA_ANALOG_TV_SUPPORT
18 ./scripts/config -e MEDIA_DIGITAL_TV_SUPPORT
19 ./scripts/config -e MEDIA_RADIO_SUPPORT
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/Documentation/virt/kvm/x86/
Dtimekeeping.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Timekeeping Virtualization for X86-Based Architectures
32 information relevant to KVM and hardware-based virtualization.
41 2.1. i8254 - PIT
42 ----------------
46 channels which can be programmed to deliver periodic or one-shot interrupts.
49 IBM PC, and historically were connected to control RAM refresh and the PC
53 The PIT uses I/O ports 0x40 - 0x43. Access to the 16-bit counters is done
59 -------------- ----------------
61 | 1.1932 MHz|---------->| CLOCK OUT | ---------> IRQ 0
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/Documentation/driver-api/usb/
Dgadget.rst11 This document presents a Linux-USB "Gadget" kernel mode API, for use
17 - Supports USB 2.0, for high speed devices which can stream data at
20 - Handles devices with dozens of endpoints just as well as ones with
21 just two fixed-function ones. Gadget drivers can be written so
24 - Flexible enough to expose more complex USB device capabilities such
28 - USB "On-The-Go" (OTG) support, in conjunction with updates to the
29 Linux-USB host side.
31 - Sharing data structures and API models with the Linux-USB host side
32 API. This helps the OTG support, and looks forward to more-symmetric
36 - Minimalist, so it's easier to support new device controller hardware.
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/Documentation/sound/designs/
Doss-emulation.rst2 Notes on Kernel OSS-Emulation
13 as add-on kernel modules, snd-pcm-oss, snd-mixer-oss and snd-seq-oss.
18 is called. The alias is defined ``sound-service-x-y``, where x and y are
22 Only necessary step for auto-loading of OSS modules is to define the
25 alias sound-slot-0 snd-emu10k1
27 As the second card, define ``sound-slot-1`` as well.
29 ``alias sound-slot-0 snd-card-0`` doesn't work any more like the old
38 after the corresponding OSS-emulation module is loaded. Don't worry
79 snd-pcm-oss and snd-rawmidi. In the case of PCM, the following
80 options are available for snd-pcm-oss:
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/Documentation/arch/arm/sa1100/
Dassabet.rst2 The Intel Assabet (SA-1110 evaluation) board
13 -------------------
25 -----------------------
38 Bootldr is the bootloader developed by Compaq for the iPAQ Pocket PC.
39 John Dorsey has produced add-on patches to add support for Assabet and
55 - ftp://ftp.netwinder.org/users/n/nico/
56 - ftp://ftp.arm.linux.org.uk/pub/linux/arm/people/nico/
57 - ftp://ftp.handhelds.org/pub/linux/arm/sa-1100-patches/
59 Look for redboot-assabet*.tgz. Some installation infos are provided in
60 redboot-assabet*.txt.
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