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/linux/Documentation/firmware-guide/acpi/
H A Dvideo_extension.rst1 .. SPDX-License-Identifier: GPL-2.0
16 Export a sysfs interface for user space to control backlight level
26 Documentation/ABI/stable/sysfs-class-backlight.
32 get the brightness level the firmware thinks it is at;
36 on write, control method _BCM will run to set the requested brightness level;
70 as a "brightness level" indicator. Thus from the user space perspective
74 Notify user space about hotkey event
79 i) For some laptops, when user presses the hotkey, a scancode will be
80 generated and sent to user space through the input device created by
82 following key code will appear to user space::
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/linux/sound/soc/tegra/
H A Dtegra20_spdif.h1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * tegra20_spdif.h - Definitions for Tegra20 SPDIF driver
6 * Copyright (C) 2011 - NVIDIA, Inc.
9 * Copyright (c) 2008-2009, NVIDIA Corporation
54 /* Transmit user Data */
75 /* Interrupt when RX user FIFO attention level is reached */
78 /* Interrupt when TX user FIFO attention level is reached */
81 /* Interrupt when RX data FIFO attention level is reached */
84 /* Interrupt when TX data FIFO attention level is reached */
152 * TX User data FIFO busy.
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/linux/include/uapi/linux/
H A Dhyperv.h1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
17 * Place - Suite 330, Boston, MA 02111-1307 USA.
95 * driver accesses. However, FREEZE messages from Hyper-V contain
102 * auto-recovery, it should not receive such messages.
171 * Maximum value size - used for both key names and value data, and includes
182 * Note: This value is used in defining the KVP exchange message - this value
193 * Maximum key size - the registry limit for the length of an entry name
203 * implementing the host/guest protocol. 2) A user level daemon that is
228 * data gathering functionality in a user mode daemon. The user level daemon
230 * kernel and user-level daemon communicate using a connector channel.
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H A Dvbox_vmmdev_types.h1 /* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR CDDL-1.0) */
3 * Virtual Device for Guest <-> VMM/Host communication, type definitions
6 * Copyright (C) 2006-2016 Oracle Corporation
20 typedef char type ## _asrt_size[1 - 2*!!(sizeof(struct type) != (size))]
22 /** enum vmmdev_request_type - VMMDev request types. */
98 /* Ensure the enum is a 32 bit data-type */
110 /* Requestor user not given. */
116 /* The root or a admin user is the requestor. */
118 /* Regular joe user is making the request. */
120 /* User classification mask. */
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H A Drxrpc.h1 /* SPDX-License-Identifier: GPL-2.0-or-later WITH Linux-syscall-note */
36 #define RXRPC_MIN_SECURITY_LEVEL 4 /* minimum security level */
37 #define RXRPC_UPGRADEABLE_SERVICE 5 /* Upgrade service[0] -> service[1] */
43 * - I
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/linux/drivers/comedi/drivers/ni_routing/
H A DREADME13 1) The register values are _NOT_ in user documentation, but rather in
15 increasingly hard to find and the NI-MHDDK (comments in in example code).
21 name enums such that a user might know which enums should be used for
22 varying purposes, but the end-user had to gain a knowledge of register
25 3) The names for signals and registers found in the various register level
26 programming manuals and vendor-provided documentation are _not_ even
27 close to the same names that are in the end-user documentation.
32 NIDAQmx(-base) c-libraries, nor with register level programming, _nor_
34 information is through the proprietary NI-MAX software, which currently only
36 cannot be exported from NI-MAX, except by screenshot.
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/linux/Documentation/admin-guide/
H A Dthunderbolt.rst1 .. SPDX-License-Identifier: GPL-2.0
7 some differences at the register level among other things. Connection
18 software connection manager in Linux also advertises security level
19 ``user`` which means PCIe tunneling is disabled by default. The
21 the software connection manager only supports ``user`` security level and
25 -----------------------------------
27 should be a userspace tool that handles all the low-level details, keeps
31 found in Documentation/ABI/testing/sysfs-bus-thunderbolt.
35 ``/etc/udev/rules.d/99-local.rules``::
44 security levels available. Intel Titan Ridge added one more security level
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/linux/sound/soc/sof/intel/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
15 This option is not user-selectable but automagically handled by
16 'select' statements at a higher level.
23 This option is not user-selectable but automagically handled by
24 'select' statements at a higher level.
35 This option is not user-selectable but automagically handled by
36 'select' statements at a higher level.
77 DMA and suspend-resume, this is not a recommended option for
315 This option is not user-selectable but automagically handled by
316 'select' statements at a higher level.
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/linux/arch/x86/mm/
H A Dpti.c1 // SPDX-License-Identifier: GPL-2.0-only
12 * Signed-off-by: Richard Fellner <richard.fellner@student.tugraz.at>
13 * Signed-off-by: Moritz Lipp <moritz.lipp@iaik.tugraz.at>
14 * Signed-off-by: Daniel Gruss <daniel.gruss@iaik.tugraz.at>
15 * Signed-off-by: Michael Schwarz <michael.schwarz@iaik.tugraz.at>
43 #define pr_fmt(fmt) "Kernel/User page tables isolation: " fmt
51 * Define the page-table levels we clone for user-space on 32
117 return -EINVAL; in pti_parse_cmdline()
137 * Top-level entries added to init_mm's usermode pgd after boot in __pti_set_user_pgtbl()
144 * The user page tables get the full PGD, accessible from in __pti_set_user_pgtbl()
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/linux/arch/xtensa/kernel/
H A Dvectors.S4 * This file contains all exception vectors (user, kernel, and double),
13 * Copyright (C) 2005 - 2008 Tensilica, Inc.
20 * We use a two-level table approach. The user and kernel exception vectors
21 * use a first-level dispatch table to dispatch the exception to a registered
23 * The default handler sets up a C-stack and dispatches the exception to a
24 * registerd C handler in the second-level dispatch table.
41 * Note: Neither the kernel nor the user exception handler generate literals.
50 #include <asm/asm-offsets.h>
60 * User exception vector. (Exceptions with PS.UM == 1, PS.EXCM == 0)
63 * We switch to the kernel stack and jump to the first level handler
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/linux/security/selinux/ss/
H A Dconstraint.h1 /* SPDX-License-Identifier: GPL-2.0 */
6 * beyond the type-based rules in `te' or the role-based
8 * used to prevent a process from transitioning to a new user
11 * process from labeling an object with a different user
32 #define CEXPR_USER 1 /* user */
37 #define CEXPR_L1L2 32 /* low level 1 vs. low level 2 */
38 #define CEXPR_L1H2 64 /* low level 1 vs. high level 2 */
39 #define CEXPR_H1L2 128 /* high level 1 vs. low level 2 */
40 #define CEXPR_H1H2 256 /* high level 1 vs. high level 2 */
41 #define CEXPR_L1H1 512 /* low level 1 vs. high level 1 */
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/linux/Documentation/admin-guide/pm/
H A Dintel_uncore_frequency_scaling.rst1 .. SPDX-License-Identifier: GPL-2.0
8 :Copyright: |copy| 2022-2023 Intel Corporation
13 ------------
30 ---------------
45 This is a read-only attribute. If users adjust max_freq_khz,
50 This is a read-only attribute. If users adjust min_freq_khz,
63 -----------------------------------------------------------------
72 The current sysfs interface supports controls at package and die level.
74 fabric cluster level.
80 To represent controls at fabric cluster level in addition to the
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H A Dintel-speed-select.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Intel(R) Speed Select Technology User Guide
14 - https://www.intel.com/content/www/us/en/architecture-and-technology/speed-select-technology-artic…
15 - https://builders.intel.com/docs/networkbuilders/intel-speed-select-technology-base-frequency-enha…
19 dynamically without pre-configuring via BIOS setup options. This dynamic
29 intel-speed-select configuration tool
32 Most Linux distribution packages may include the "intel-speed-select" tool. If not,
38 # cd tools/power/x86/intel-speed-select/
43 ------------
47 # intel-speed-select --help
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/linux/arch/x86/kernel/
H A Dioport.c1 // SPDX-License-Identifier: GPL-2.0
3 * This contains the io-permission bitmap code - written by obz, with changes
24 /* Can be NULL when current->thread.iopl_emul == 3 */ in io_bitmap_share()
25 if (current->thread.io_bitmap) { in io_bitmap_share()
30 refcount_inc(&current->thread.io_bitmap->refcnt); in io_bitmap_share()
31 tsk->thread.io_bitmap = current->thread.io_bitmap; in io_bitmap_share()
39 struct thread_struct *t = &tsk->thread; in task_update_io_bitmap()
41 if (t->iopl_emul == 3 || t->io_bitmap) { in task_update_io_bitmap()
42 /* TSS update is handled on exit to user space */ in task_update_io_bitmap()
55 struct io_bitmap *iobm = tsk->thread.io_bitmap; in io_bitmap_exit()
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/linux/Documentation/networking/
H A Dnfc.rst15 - NFC adapters management;
16 - Polling for targets;
17 - Low-level data exchange;
21 responsible for providing an interface to control operations and low-level
26 The low-level data exchange interface is provided by the new socket family
29 .. code-block:: none
31 +--------------------------------------+
32 | USER SPACE |
33 +--------------------------------------+
35 | low-level | control
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/linux/drivers/acpi/acpica/
H A Dnswalk.c1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
4 * Module Name: nswalk - Functions for walking the ACPI namespace
6 * Copyright (C) 2000 - 2025, Intel Corp.
21 * PARAMETERS: parent_node - Parent node whose children we are
23 * child_node - Previous child that was found.
26 * RETURN: struct acpi_namespace_node - Pointer to the NEXT child or NULL if
45 return (parent_node->child); in acpi_ns_get_next_node()
50 return (child_node->peer); in acpi_ns_get_next_node()
57 * PARAMETERS: type - Type of node to be searched for
58 * parent_node - Parent node whose children we are
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/linux/arch/parisc/kernel/
H A Dtraps.c1 // SPDX-License-Identifier: GPL-2.0
56 #include "../math-emu/math-emu.h" /* for handle_fpe() */
63 unsigned long mask = 1UL << (nbits - 1); in printbinary()
78 #define FFMT "%016llx" /* fpregs are 64-bit always */
81 printk("%s%s%02d-%02d " fmt " " fmt " " fmt " " fmt "\n", \
85 static void print_gr(const char *level, struct pt_regs *regs) in print_gr() argument
90 printk("%s\n", level); in print_gr()
91 printk("%s YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI\n", level); in print_gr()
92 printbinary(buf, regs->gr[0], 32); in print_gr()
93 printk("%sPSW: %s %s\n", level, buf, print_tainted()); in print_gr()
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/linux/Documentation/admin-guide/thermal/
H A Dintel_powerclamp.rst6 - Arjan van de Ven <arjan@linux.intel.com>
7 - Jacob Pan <jacob.jun.pan@linux.intel.com>
12 - Goals and Objectives
15 - Idle Injection
16 - Calibration
19 - Effectiveness and Limitations
20 - Power vs Performance
21 - Scalability
22 - Calibration
23 - Comparison with Alternative Techniques
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/linux/Documentation/arch/x86/x86_64/
H A Dfred.rst1 .. SPDX-License-Identifier: GPL-2.0
11 privilege level (ring transitions). The FRED architecture was
21 establishes the full user context.
33 The LKGS instruction can be used by 64-bit operating systems that do
46 framework must be implemented to facilitate the event-to-handler
48 once an event is delivered, and employs a two-level dispatch.
50 The first level dispatching is event type based, and the second level
53 Full supervisor/user context
56 FRED event delivery atomically save and restore full supervisor/user
86 event handling, and each stack level should be configured to use a
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/linux/drivers/scsi/
H A Dscsi_logging.h1 /* SPDX-License-Identifier: GPL-2.0 */
7 * This defines the scsi logging feature. It is a means by which the user can
9 * really useful for fault tracing. The logging word is divided into 10 3-bit
13 * where these are specified. For a first go-around, 3 bits is more than
45 ((scsi_logging_level >> (SHIFT)) & ((1 << (BITS)) - 1))
47 #define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD) \ argument
49 if (unlikely((SCSI_LOG_LEVEL(SHIFT, BITS)) > (LEVEL))) \
56 #define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD) do { } while (0) argument
61 * log events. If logging isn't enabled, they are no-ops and will be
62 * completely absent from the user's code.
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/linux/include/asm-generic/
H A Dpgalloc.h1 /* SPDX-License-Identifier: GPL-2.0 */
11 * __pte_alloc_one_kernel - allocate memory for a PTE-level kernel page table
37 * pte_alloc_one_kernel - allocate memory for a PTE-level kernel page table
50 * pte_free_kernel - free PTE-level kernel page table memory
60 * __pte_alloc_one - allocate memory for a PTE-level user page table
89 * pte_alloc_one - allocate a page for PTE-level user page table
109 * pte_free - free PTE-level user page table memory
125 * pmd_alloc_one - allocate memory for a PMD-level page table
130 * Allocations use %GFP_PGTABLE_USER in user context and
159 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); in pmd_free()
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/linux/drivers/scsi/megaraid/
H A Dmegaraid_ioctl.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
6 * Copyright (c) 2003-2004 LSI Logic Corporation.
10 * Definitions to interface with user level applications
26 #define CL_DLEVEL1 1 /* debug level 1, informative */
27 #define CL_DLEVEL2 2 /* debug level 2, verbose */
28 #define CL_DLEVEL3 3 /* debug level 3, very verbose */
31 * con_log() - console log routine
32 * @level : indicates the severity of the message.
36 * debug level. Also it attaches the appropriate kernel severity level with
39 #define con_log(level, fmt) if (LSI_DBGLVL >= level) printk fmt; argument
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/linux/arch/arm64/include/asm/
H A Dtlbflush.h1 /* SPDX-License-Identifier: GPL-2.0-only */
5 * Copyright (C) 1999-2003 Russell King
69 * - 4KB : 1
70 * - 16KB : 2
71 * - 64KB : 3
92 * Level-based TLBI operations.
94 * When ARMv8.4-TTL exists, TLBI operations take an additional hint for
95 * the level at which the invalidation must take place. If the level is
96 * wrong, no invalidation may take place. In the case where the level
98 * a non-hinted invalidation. Any provided level outside the hint range
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/linux/arch/powerpc/include/asm/nohash/32/
H A Dmmu-8xx.h1 /* SPDX-License-Identifier: GPL-2.0 */
10 * During software tablewalk, the registers used perform mask/shift-add
33 * respectively NA for All or X for Supervisor and no access for User.
37 * "all User" rules, that will lead to NA for all.
39 * 0 => Kernel => 11 (all accesses performed according as user iaw page definition)
41 * 2 => User => 11 (all accesses performed according as user iaw page definition)
42 * 3 => User+Accessed => 10 (all accesses performed according to swaped page definition) for KUEP
43 * 4-15 => Not Used
57 /* A "level 1" or "segment" or whatever you want to call it register.
120 /* The pointer to the base address of the first level page table.
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/linux/Documentation/driver-api/thermal/
H A Dx86_pkg_temperature_thermal.rst7 * x86: with package level thermal management
14 ---------
16 Intel® 64 and IA-32 Architectures Software Developer’s Manual (Jan, 2013):
17 Chapter 14.6: PACKAGE LEVEL THERMAL MANAGEMENT
20 -----------
22 This driver register CPU digital temperature package level sensor as a thermal
23 zone with maximum two user mode configurable trip points. Number of trip points
25 user mode can receive notification via thermal notification mechanism and can
30 --------------------
39 - trip_point_0_temp
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