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/linux/tools/power/pm-graph/
H A Dbootgraph.83 bootgraph \- Kernel boot timing analysis
13 timeline is split into two phases: kernel mode & user mode. kernel mode
15 Once user mode begins, the init process is called, and the init calls
24 Generates output files in subdirectory: boot-yymmdd-HHMMSS
30 \fB-h\fR
33 \fB-v\fR
36 \fB-addlogs\fR
40 \fB-result \fIfile\fR
43 \fB-o \fIname\fR
47 e.g. boot-{hostname}-{date}-{time}
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/linux/arch/m68k/
H A DKconfig.devices1 # SPDX-License-Identifier: GPL-2.0
15 Use the power-on LED on your machine as a load meter. The exact
16 behavior is platform-dependent, but normally the flash frequency is
17 a hyperbolic function of the 5-minute load average.
19 # We have a dedicated heartbeat LED. :-)
25 access to information about the machine you're running on,
102 If you want to use your Amiga's built-in serial port in Linux,
112 machine, say Y here.
119 machine, say Y here.
128 mode). This could be useful if some terminal or printer is connected
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/linux/arch/x86/kernel/
H A Dsmp.c1 // SPDX-License-Identifier: GPL-2.0-or-later
6 * (c) 1998-99, 2000, 2009 Ingo Molnar <mingo@redhat.com>
46 * None of the E1AP-E3AP errata are visible to the user.
53 * None of the A1AP-A3AP errata are visible to the user.
60 * None of 1AP-9AP errata are visible to the normal user,
62 * This is very rare and a non-problem.
64 * 1AP. Linux maps APIC as non-cacheable
69 * 5AP. symmetric IO mode (normal Linux operation) not affected.
70 * 'noapic' mode has vector 0xf filled out properly.
71 * 6AP. 'noapic' mode might be affected - fixed in later steppings
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/linux/Documentation/arch/riscv/
H A Duabi.rst1 .. SPDX-License-Identifier: GPL-2.0
3 RISC-V Linux User ABI
7 ------------------------------------
14 #. Single-letter extensions come first, in canonical order.
17 #. All multi-letter extensions will be separated from other extensions by an
21 single-letter extensions and before any higher-privileged extensions.
29 #. Standard supervisor-level extensions (starting with 'S') will be listed
30 after standard unprivileged extensions. If multiple supervisor-level
33 #. Standard machine-level extensions (starting with 'Zxm') will be listed
34 after any lower-privileged, standard extensions. If multiple machine-level
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/linux/include/uapi/linux/
H A Dparport.h10 /* Start off with user-visible constants */
12 /* Maximum of 16 ports per machine */
16 #define PARPORT_IRQ_NONE -1
17 #define PARPORT_DMA_NONE -1
18 #define PARPORT_IRQ_AUTO -2
19 #define PARPORT_DMA_AUTO -2
20 #define PARPORT_DMA_NOFIFO -3
21 #define PARPORT_DISABLE -2
22 #define PARPORT_IRQ_PROBEONLY -3
23 #define PARPORT_IOHI_AUTO -1
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/linux/arch/powerpc/include/asm/
H A Dreg.h1 /* SPDX-License-Identifier: GPL-2.0 */
6 * number used in the Programming Environments Manual For 32-Bit
17 #include <asm/asm-const.h>
18 #include <asm/feature-fixups.h>
31 #define MSR_SF_LG 63 /* Enable 64 bit mode */
48 #define MSR_ME_LG 12 /* Machine Check Enable */
49 #define MSR_FE0_LG 11 /* Floating Exception mode 0 */
53 #define MSR_FE1_LG 8 /* Floating Exception mode 1 */
58 #define MSR_PX_LG 2 /* Protection Exclusive Mode */
70 #define MSR_SF __MASK(MSR_SF_LG) /* Enable 64 bit mode */
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/linux/scripts/kconfig/
H A Dmconf.c1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
5 * Introduced single menu mode (show all sub-menus in one large tree).
6 * 2002-11-06 Petr Baudis <pasky@ucw.cz>
26 #include "mnconf-common.h"
30 "--------\n"
32 "Features can either be built-in, modularized, or ignored. Parameters\n"
39 " - - are selected by other feature,\n"
46 "through the available options (i.e. Y->N->M->Y).\n"
51 "----------\n"
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/linux/Documentation/virt/kvm/x86/
H A 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.
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
63 -------------- | +->| GATE TIMER 0 |
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/linux/arch/arm/kernel/
H A Dhead.S1 /* SPDX-License-Identifier: GPL-2.0-only */
5 * Copyright (C) 1994-2002 Russell King
9 * Kernel startup code for all 32-bit CPUs
19 #include <asm/asm-offsets.h>
48 .equ swapper_pg_dir, KERNEL_RAM_VADDR - PG_DIR_SIZE
74 * ---------------------------
77 * are: MMU = off, D-cache = off, I-cache = dont care, r0 = 0,
78 * r1 = machine nr, r2 = atags or dtb pointer.
83 * See linux/arch/arm/tools/mach-types for the complete list of machine
86 * We're trying to keep crap to a minimum; DO NOT add any machine specific
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/linux/Documentation/arch/m68k/
H A Dkernel-options.rst9 Author: Roman.Hodek@informatik.uni-erlangen.de (Roman Hodek)
11 Update: jds@kom.auc.dk (Jes Sorensen) and faq@linux-m68k.org (Chris Lawrence)
58 ----------
76 /dev/ram: -> 0x0100 (initial ramdisk)
77 /dev/hda: -> 0x0300 (first IDE disk)
78 /dev/hdb: -> 0x0340 (second IDE disk)
79 /dev/sda: -> 0x0800 (first SCSI disk)
80 /dev/sdb: -> 0x0810 (second SCSI disk)
81 /dev/sdc: -> 0x0820 (third SCSI disk)
82 /dev/sdd: -> 0x0830 (forth SCSI disk)
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/linux/Documentation/driver-api/usb/
H A 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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/linux/arch/sparc/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
3 bool "64-bit kernel" if "$(ARCH)" = "sparc"
10 Say yes to build a 64-bit kernel - formerly known as sparc64
11 Say no to build a 32-bit kernel - formerly known as sparc
155 bool "Symmetric multi-processing support"
161 If you say N here, the kernel will run on uni- and multiprocessor
162 machines, but will use only one CPU of a multiprocessor machine. If
164 uniprocessor machines. On a uniprocessor machine, the kernel
171 See also <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO
226 bool "Support for hot-pluggable CPUs"
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/linux/drivers/char/
H A Dppdev.c1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * This is the code behind /dev/parport* -- it allows a user-space
8 * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net>
20 * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be
21 * confused with ioctl(fd, SETPHASER, &stun). ;-)
36 * GETMODE gets the current IEEE1284 mode
38 * GETFLAGS gets current (user-visible) flags
39 * SETFLAGS sets current (user-visible) flags
47 * - On error, copy_from_user and copy_to_user do not return -EFAULT,
70 #define PP_VERSION "ppdev: user-space parallel port driver"
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/linux/Documentation/core-api/
H A Dcpu_hotplug.rst26 A more novel use of CPU-hotplug support is its use today in suspend resume
27 support for SMP. Dual-core and HT support makes even a laptop run SMP kernels
75 from the map depending on the event is hot-add/hot-remove. There are currently
80 be read-only for most use. When setting up per-cpu resources almost always use
94 $ ls -lh /sys/devices/system/cpu
96 drwxr-xr-x 9 root root 0 Dec 21 16:33 cpu0
97 drwxr-xr-x 9 root root 0 Dec 21 16:33 cpu1
98 drwxr-xr-x 9 root root 0 Dec 21 16:33 cpu2
99 drwxr-xr-x 9 root root 0 Dec 21 16:33 cpu3
100 drwxr-xr-x 9 root root 0 Dec 21 16:33 cpu4
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/linux/drivers/net/ethernet/sun/
H A Dsunhme.h1 /* SPDX-License-Identifier: GPL-2.0 */
38 #define GREG_STAT_ACNTEXP 0x00000004 /* Align-error counter expired */
39 #define GREG_STAT_CCNTEXP 0x00000008 /* CRC-error counter expired */
40 #define GREG_STAT_LCNTEXP 0x00000010 /* Length-error counter expired */
42 #define GREG_STAT_CVCNTEXP 0x00000040 /* Code-violation counter expired */
46 #define GREG_STAT_MAXPKTERR 0x00000400 /* Max-packet size error */
47 #define GREG_STAT_NCNTEXP 0x00000800 /* Normal-collision counter expired */
48 #define GREG_STAT_ECNTEXP 0x00001000 /* Excess-collision counter expired */
49 #define GREG_STAT_LCCNTEXP 0x00002000 /* Late-collision counter expired */
50 #define GREG_STAT_FCNTEXP 0x00004000 /* First-collision counter expired */
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/linux/drivers/acpi/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
19 Linux requires an ACPI-compliant platform (hardware/firmware),
20 and assumes the presence of OS-directed configuration and power
26 the Plug-and-Play BIOS specification (PnP BIOS), the
36 ACPI is an open industry specification originally co-developed by
37 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently,
72 Enable in-kernel debugging of AML facilities: statistics,
126 mode or in I2S mode, where the former is supposed to be used on Linux
130 This option enables a DMI-based quirk for the above Dell machine (so
192 performs user-defined actions such as shutting down the system.
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/linux/drivers/tty/serial/8250/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
17 serial mouse and don't intend to use their machine's standard serial
23 non-standard serial ports, since the configuration information will
51 If you did not notice yet and/or you have userspace from pre-3.7, it
96 mode). This could be useful if some terminal or printer is connected
99 Even if you say Y here, the currently visible virtual console
146 Note that serial ports on NetMos 9835 Multi-I/O cards are handled
169 Say Y here to enable support for 16-bit PCMCIA serial devices,
171 multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
172 credit-card size devices often used with laptops.)
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/linux/drivers/ata/
H A Dpata_hpt366.c1 // SPDX-License-Identifier: GPL-2.0-only
9 * Copyright (C) 1999-2003 Andre Hedrick <andre@linux-ide.org>
49 * 30 PIO_MST enable. If set, the chip is in bus master mode during
112 * hpt36x_find_mode - find the hpt36x timing
114 * @speed: transfer mode
122 struct hpt_clock *clocks = ap->host->private_data; in hpt36x_find_mode()
124 while (clocks->xfer_mode) { in hpt36x_find_mode()
125 if (clocks->xfer_mode == speed) in hpt36x_find_mode()
126 return clocks->timing; in hpt36x_find_mode()
150 "IBM-DTLA-307075",
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/linux/Documentation/virt/uml/
H A Duser_mode_linux_howto_v2.rst1 .. SPDX-License-Identifier: GPL-2.0
13 Welcome to User Mode Linux
15 User Mode Linux is the first Open Source virtualization platform (first
25 Most OSes today have built-in support for a number of "fake"
27 User Mode Linux takes this concept to the ultimate extreme - there
30 concepts which map onto something provided by the host - files, sockets,
36 The UML kernel is just a process running on Linux - same as any other
40 host machine assists UML in intercepting everything the program running
49 Why Would I Want User Mode Linux?
53 * If User Mode Linux kernel crashes, your host kernel is still fine. It
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/linux/Documentation/networking/device_drivers/ethernet/cirrus/
H A Dcs89x0.rst1 .. SPDX-License-Identifier: GPL-2.0
33 2.1 CS8900-based Adapter Configuration
34 2.2 CS8920-based Adapter Configuration
40 4.2 Compiling the driver to support memory mode
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
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/linux/Documentation/accel/amdxdna/
H A Damdnpu.rst1 .. SPDX-License-Identifier: GPL-2.0-only
15 AMD NPU (Neural Processing Unit) is a multi-user AI inference accelerator
16 integrated into AMD client APU. NPU enables efficient execution of Machine
27 --------------
44 ----------------
52 ---------------
58 NPU Firmware uses a dedicated instance of an isolated non-privileged context
66 ---------
79 -------
81 NPU is visible to the x86 host CPU as a PCIe device with multiple BARs and some
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/linux/drivers/usb/serial/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
14 Please read <file:Documentation/usb/usb-serial.rst> for more
30 allows logins in single user mode). This could be useful if some
33 Even if you say Y here, the currently visible virtual console
50 read <file:Documentation/usb/usb-serial.rst> for more information on
61 - Suunto ANT+ USB device.
62 - Medtronic CareLink USB device
63 - Fundamental Software dongle.
64 - Google USB serial devices
65 - HP4x calculators
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/linux/Documentation/admin-guide/mm/
H A Dmemory-hotplug.rst14 memory available to a machine at runtime. In the simplest case, it consists of
20 - The physical memory available to a machine can be adjusted at runtime, up- or
25 - Replacing hardware, such as DIMMs or whole NUMA nodes, without downtime. One
28 - Reducing energy consumption either by physically unplugging memory modules or
32 used to expose persistent memory, other performance-differentiated memory and
39 ---
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/linux/Documentation/virt/kvm/
H A Dapi.rst1 .. SPDX-License-Identifier: GPL-2.0
4 The Definitive KVM (Kernel-based Virtual Machine) API Documentation
21 a virtual machine. Depending on the file descriptor that accepts them,
24 - System ioctls: These query and set global attributes which affect the
28 - VM ioctls: These query and set attributes that affect an entire virtual
29 machine, for example memory layout. In addition a VM ioctl is used to
35 - vcpu ioctls: These query and set attributes that control the operation
43 - device ioctls: These query and set attributes that control the operation
92 facility that allows backward-compatible extensions to the API to be
133 -----------------------
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/linux/drivers/video/fbdev/
H A Damifb.c2 * linux/drivers/video/amifb.c -- Amiga builtin chipset frame buffer device
4 * Copyright (C) 1995-2003 Geert Uytterhoeven
30 * - 24 Jul 96: Copper generates now vblank interrupt and
32 * - 14 Jul 96: Rework and hopefully last ECS bugs fixed
33 * - 7 Mar 96: Hardware sprite support by Roman Zippel
34 * - 18 Feb 96: OCS and ECS support by Roman Zippel
36 * - 2 Dec 95: AGA version by Geert Uytterhoeven
107 ---------------------
111 +----------+---------------------------------------------+----------+-------+
115 +----------###############################################----------+-------+
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