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/linux/include/linux/
H A Dtimekeeping.h1 /* SPDX-License-Identifier: GPL-2.0 */
25 * ktime_get() family - read the current time in a multitude of ways.
27 * The default time reference is CLOCK_MONOTONIC, starting at
28 * boot time but not counting the time spent in suspend.
32 * To get the time in a different format, use the ones with
35 * See Documentation/core-api/timekeeping.rst for more details.
82 * ktime_get_real - get the real (wall-) time in ktime_t format
84 * Returns: real (wall) time in ktime_t format
97 * ktime_get_boottime - Get monotonic time since boot in ktime_t format
100 * time spent in suspend.
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H A Dtimekeeper_internal.h1 /* SPDX-License-Identifier: GPL-2.0 */
12 #include <linux/time.h>
15 * timekeeper_ids - IDs for various time keepers in the kernel
16 * @TIMEKEEPER_CORE: The central core timekeeper managing system time
25 TIMEKEEPER_AUX_LAST = TIMEKEEPER_AUX_FIRST + MAX_AUX_CLOCKS - 1,
31 * struct tk_read_base - base structure for timekeeping readout
38 * @base: ktime_t (nanoseconds) base time for readout
62 * struct timekeeper - Structure holding internal timekeeping values.
64 * @xtime_sec: Current CLOCK_REALTIME time in seconds
65 * @ktime_sec: Current CLOCK_MONOTONIC time in seconds
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/linux/Documentation/firmware-guide/acpi/
H A Ddebug.rst1 .. SPDX-License-Identifier: GPL-2.0
10 Compile-time configuration
16 Boot- and run-time configuration
20 you're interested in. At boot-time, use the acpi.debug_layer and
21 acpi.debug_level kernel command line options. After boot, you can use the
32 You can set the debug_layer mask at boot-time using the acpi.debug_layer
33 command line argument, and you can change it after boot by writing values
66 You can set the debug_level mask at boot-time using the acpi.debug_level
67 command line argument, and you can change it after boot by writing values
118 AML) during boot::
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/linux/arch/arm64/boot/dts/rockchip/
H A Drk3399-roc-pc.dtsi1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
3 * Copyright (c) 2017 T-Chip Intelligent Technology Co., Ltd
6 /dts-v1/;
7 #include <dt-bindings/input/linux-event-codes.h>
8 #include <dt-bindings/pwm/pwm.h>
12 model = "Firefly ROC-RK3399-PC Board";
13 compatible = "firefly,roc-rk3399-pc", "rockchip,rk3399";
22 stdout-path = "serial2:1500000n8";
26 compatible = "pwm-backlight";
30 clkin_gmac: external-gmac-clock {
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H A Drk3399-leez-p710.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
6 /dts-v1/;
7 #include <dt-bindings/input/linux-event-codes.h>
8 #include <dt-bindings/interrupt-controller/irq.h>
9 #include <dt-bindings/pwm/pwm.h>
24 stdout-path = "serial2:1500000n8";
27 clkin_gmac: external-gmac-clock {
28 compatible = "fixed-clock";
29 clock-frequency = <125000000>;
30 clock-output-names = "clkin_gmac";
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H A Drk3399-rock-pi-4.dtsi1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
7 #include <dt-bindings/input/linux-event-codes.h>
8 #include <dt-bindings/leds/common.h>
9 #include <dt-bindings/pwm/pwm.h>
19 stdout-path = "serial2:1500000n8";
22 clkin_gmac: external-gmac-clock {
23 compatible = "fixed-clock";
24 clock-frequency = <125000000>;
25 clock-output-names = "clkin_gmac";
26 #clock-cells = <0>;
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H A Drk3399-hugsun-x99.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
2 /dts-v1/;
3 #include <dt-bindings/pwm/pwm.h>
4 #include <dt-bindings/input/input.h>
5 #include <dt-bindings/interrupt-controller/irq.h>
20 stdout-path = "serial2:1500000n8";
23 clkin_gmac: external-gmac-clock {
24 compatible = "fixed-clock";
25 clock-frequency = <125000000>;
26 clock-output-names = "clkin_gmac";
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H A Drk3399-rockpro64.dtsi1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
7 #include <dt-bindings/input/linux-event-codes.h>
8 #include <dt-bindings/pwm/pwm.h>
20 stdout-path = "serial2:1500000n8";
23 clkin_gmac: external-gmac-clock {
24 compatible = "fixed-clock";
25 clock-frequency = <125000000>;
26 clock-output-names = "clkin_gmac";
27 #clock-cells = <0>;
30 gpio-keys {
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H A Drk3399-orangepi.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
6 /dts-v1/;
8 #include "dt-bindings/pwm/pwm.h"
9 #include "dt-bindings/input/input.h"
10 #include <dt-bindings/interrupt-controller/irq.h>
11 #include "dt-bindings/usb/pd.h"
16 compatible = "xunlong,rk3399-orangepi", "rockchip,rk3399";
26 stdout-path = "serial2:1500000n8";
29 clkin_gmac: external-gmac-clock {
30 compatible = "fixed-clock";
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H A Drk3399-firefly.dts1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
6 /dts-v1/;
7 #include <dt-bindings/input/linux-event-codes.h>
8 #include <dt-bindings/interrupt-controller/irq.h>
9 #include <dt-bindings/pwm/pwm.h>
10 #include <dt-bindings/usb/pd.h>
14 model = "Firefly-RK3399 Board";
15 compatible = "firefly,firefly-rk3399", "rockchip,rk3399";
25 stdout-path = "serial2:1500000n8";
29 compatible = "pwm-backlight";
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H A Drk3399-nanopi4.dtsi1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
3 * RK3399-based FriendlyElec boards device tree source
14 /dts-v1/;
15 #include <dt-bindings/input/linux-event-codes.h>
27 stdout-path = "serial2:1500000n8";
30 clkin_gmac: external-gmac-clock {
31 compatible = "fixed-clock";
32 clock-frequency = <125000000>;
33 clock-output-names = "clkin_gmac";
34 #clock-cells = <0>;
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H A Drk3399-khadas-edge.dtsi1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
7 /dts-v1/;
8 #include <dt-bindings/input/linux-event-codes.h>
9 #include <dt-bindings/interrupt-controller/irq.h>
10 #include <dt-bindings/pwm/pwm.h>
21 stdout-path = "serial2:1500000n8";
24 clkin_gmac: external-gmac-clock {
25 compatible = "fixed-clock";
26 clock-frequency = <125000000>;
27 clock-output-names = "clkin_gmac";
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/linux/tools/testing/ktest/
H A Dsample.conf54 # MIN_CONFIG = /home/test/config-test1
57 # MIN_CONFIG = /home/test/config-default
62 # /home/test/config-test-1. Then 10 tests will be executed
63 # with MIN_CONFIG with /home/test/config-default.
68 # MIN_CONFIG = /home/test/config-use-sometimes
71 # MIN_CONFIG = /home/test/config-most-times
112 # BUILD_TYPE = useconfig:${CONFIG_DIR}/config-network
116 # BUILD_TYPE = useconfig:${CONFIG_DIR}/config-normal
124 # BUILD_TYPE = useconfig:${CONFIG_DIR}/config-network
127 # BUILD_TYPE = useconfig:${CONFIG_DIR}/config-tests
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/linux/tools/power/pm-graph/
H A Dbootgraph.83 bootgraph \- Kernel boot timing analysis
10 \fBbootgraph \fP reads the dmesg log from kernel boot and
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
45 Use {date}, {time}, {hostname} for current values.
47 e.g. boot-{hostname}-{date}-{time}
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/linux/security/integrity/ima/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
36 bool "Enable carrying the IMA measurement list across a soft boot"
41 a TPM's quote after a soft boot, the IMA measurement list of the
42 running kernel must be saved and restored on boot.
71 limited to 255 characters. The 'ima-ng' measurement list
74 by specifying "ima_template=" on the boot command line.
77 bool "ima-n
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/linux/Documentation/timers/
H A Dno_hz.rst2 NO_HZ: Reducing Scheduling-Clock Ticks
6 This document describes Kconfig options and boot parameters that can
7 reduce the number of scheduling-clock interrupts, thereby improving energy
9 some types of computationally intensive high-performance computing (HPC)
10 applications and for real-time applications.
12 There are three main ways of managing scheduling-clock interrupts
13 (also known as "scheduling-clock ticks" or simply "ticks"):
15 1. Never omit scheduling-clock ticks (CONFIG_HZ_PERIODIC=y or
16 CONFIG_NO_HZ=n for older kernels). You normally will -not-
19 2. Omit scheduling-clock ticks on idle CPUs (CONFIG_NO_HZ_IDLE=y or
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/linux/Documentation/admin-guide/
H A Dkernel-parameters.txt5 avoid prolonged boot times. The lazy option will add
10 at once during boot.
16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nocmcff -- Disable firmware first mode for corrected
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/linux/lib/
H A DKconfig.debug1 # SPDX-License-Identifier: GPL-2.0-only
10 Selecting this option causes time stamps of the printk()
19 parameter printk.time=1. See Documentation/admin-guide/kernel-parameters.rst
34 Since toggling after boot makes the code racy, currently there is
50 int "Default console loglevel (1-15)"
60 Note: This does not affect the log level of un-prefixed printk()
65 int "quiet console loglevel (1-15)"
76 int "Default message log level (1-7)"
82 This was hard-coded to KERN_WARNING since at least 2.6.10 but folks
91 bool "Delay each boot printk message by N milliseconds"
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H A DKconfig.kgdb1 # SPDX-License-Identifier: GPL-2.0-only
49 Share a serial console with kgdb. Sysrq-g must be used
61 the tests. The most basic of this I/O module is to boot
62 a kernel boot arguments "kgdbwait kgdbts=V1F100"
65 bool "KGDB: Run tests on boot"
69 Run the kgdb tests on boot up automatically without the need
78 boot
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/linux/arch/arm64/include/asm/
H A Dcpufeature.h1 /* SPDX-License-Identifier: GPL-2.0-only */
9 #include <asm/alternative-macros.h>
34 * between the values, the features are classified into 3 types - LOWER_SAFE,
80 * A @mask field set to full-1 indicates that the corresponding field
83 * A @mask field set to full-0 with the corresponding @val field set
84 * to full-0 denotes that this field has no override
86 * A @mask field set to full-0 with the corresponding @val field set
87 * to full-1 denotes that this field has an invalid override.
95 * @arm64_ftr_reg - Feature register
144 * c) SCOPE_BOOT_CPU: Check only on the primary boot CPU to detect the
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H A Dfixmap.h2 * fixmap.h: compile-time virtual memory allocation
22 #include <asm/boot.h>
24 #include <asm/pgtable-prot.h>
27 * Here we define all the compile-time 'special' virtual
29 * compile time, but to set the physical address only
30 * in the boot process.
32 * Each enum increment in these 'compile-time allocated'
33 * memory buffers is page-sized. Use set_fixmap(idx,phys)
79 * Temporary boot-time mappings, used by early_ioremap(),
87 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
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/linux/arch/x86/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
4 bool "64-bit kernel" if "$(ARCH)" = "x86"
7 Say yes to build a 64-bit kernel - formerly known as x86_64
8 Say no to build a 32-bit kernel - formerly known as i386
13 # Options that are inherently 32-bit kernel only:
26 # Options that are inherently 64-bit kernel only:
56 # ported to 32-bit as well. )
158 # Word-size accesses may read uninitialized data past the trailing \0
342 default "elf32-i386" if X86_32
343 default "elf64-x86-64" if X86_64
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/linux/Documentation/arch/powerpc/
H A Dbootwrapper.rst2 The PowerPC boot wrapper
8 a boot wrapper to make it usable by the system firmware. There is no
9 standard PowerPC firmware interface, so the boot wrapper is designed to
12 The boot wrapper can be found in the arch/powerpc/boot/ directory. The
17 others. U-Boot is typically found on embedded PowerPC hardware, but there
21 The boot wrapper is built from the makefile in arch/powerpc/boot/Makefile and
22 it uses the wrapper script (arch/powerpc/boot/wrapper) to generate target
28 U-Boot (for versions that don't understand the device
30 the image. The boot wrapper, kernel and device tree
31 are all embedded inside the U-Boot uImage file format
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/linux/tools/testing/memblock/
H A DREADME8 Memblock is a boot time memory allocator[1] that manages memory regions before
17 allocation functionalities of memblock. The main data structure of the boot time
18 memory allocator is initialized at the build time, so the checks here reuse its
38 append the `-v` options when you run the tests:
40 $ ./main -v
45 For the full list of options from command line, see `./main --help`.
62 |-- asm ------------------,
63 |-- lib |-- implement function and struct stubs
64 |-- linux ------------------'
65 |-- scripts
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/linux/arch/arm64/boot/dts/nvidia/
H A Dtegra210-p2180.dtsi1 // SPDX-License-Identifier: GPL-2.0
2 #include <dt-bindings/mfd/max77620.h>
18 stdout-path = "serial0:115200n8";
27 vdd-supply = <&vdd_gpu>;
33 /delete-property/ dmas;
34 /delete-property/ dma-names;
39 /delete-property/ reg-shift;
41 compatible = "nvidia,tegra30-hsuart";
42 reset-names = "serial";
45 compatible = "brcm,bcm43540-bt";
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