Commit Graph

112 Commits

Author SHA1 Message Date
Anas Nashif
77ba3c3b8b kconfig: define architecture as a kconfig variable
Do not depend on environment variables and use a kconfig variable
for defining the architecture.

In addition, remove the X86_32 variable, it just duplicates X86 for
not good reason, at least until start supporting MCUs with 64bit.

Change-Id: Ia001db81ed007e6a43f34506fed9be1345b88a4b
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2016-02-05 20:24:52 -05:00
Anas Nashif
beb160d22c sanity: make boot_time test work for Quark SE and D2000
Add configuration files for new platform and adapt options
of the benchmarks for those platforms.

Change-Id: I7c5011966c3a99f0b1c2c3fc44ba05b67ac6f953
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2016-02-05 20:24:49 -05:00
Anas Nashif
c7eecba078 ipi: disable on footprint benchmarks
Change-Id: Ia90fabfe41414381b79b70e34bc12bd023d68ca7
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2016-02-05 20:24:49 -05:00
Dirk Brandewie
1e9992c4fb x86: reduce fiber stacksize for Quark D2000
This will allow tests to be built for this platform.

Change-Id: I2275ec71af6cdb6f71c131fa26c5eae2d91c2475
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
2016-02-05 20:24:49 -05:00
Peter Mitsis
2920c72915 galileo: Disable features in minimal footprint
Prevents unnecessary features from bloating the size of the galileo's
minimal footprint benchmark project.

Change-Id: Ie689a2c6fe1409904c43ec9a24a0efc01e768e4c
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:24:48 -05:00
Dmitriy Korovkin
f1420515a7 irq: Add flags to IRQ_CONNECT_STATIC() macro and irq_connect() function
Flags allow passing IRQ triggering option for x86 architecture.
Each platform defines flags for a particular device and then
device driver uses them when registers the interrupt handler.

The change in API means that device drivers and sample
applications need to use the new API.

IRQ triggering configuration is now handled by device drivers
by using flags passed to interrupt registering API:
IRQ_CONNECT_STATIC() or irq_connect()

Change-Id: Ibc4312ea2b4032a2efc5b913c6389f780a2a11d1
Signed-off-by: Dmitriy Korovkin <dmitriy.korovkin@windriver.com>
2016-02-05 20:24:44 -05:00
Anas Nashif
f75a8157e3 sanity: exclude Minute IA platforms from float tests
exclude Minute-IA platforms from tests that enable CONFIG_FLOAT.

Change-Id: Id186857403cb73d009b6e9e126c4e240f95dbf1a
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2016-02-05 20:24:43 -05:00
Andrew Boie
b43758d22a x86: remove dynamically generated IRQ and exception code
We are interested in supporting some XIP x86 platforms which are
unable to fetch CPU instructions from system RAM. This requires
refactoring our dynamic IRQ/exc code which currently synthesizes
assembly language instructions to create IRQ stubs on-the-fly.

Instead, a new approach is taken. Given that the configuration at
build time specifies the number of required stubs, use this
to generate a build time a set of tiny stub functions which simply
push a 'stub id' and then call common dynamic interrupt code.
The handler function and handler argument is saved in a table keyed by
this stub id.

CONFIG_EOI_HANDLER_SUPPORTED removed, the code hasn't been conditionally
compiled for some time and in all cases we call _loapic_eoi() when
finished with an interrupt.

Some other out-of-date verbiage in comments related to supporting
non-APIC removed.

Previously, when dynamic exceptions were created a pointer would
be passed in by the caller reserving ram for the stub code. Since
this is no longer feasible, two new Kconfig options have been added.
CONFIG_NUM_DYNAMIC_EXC_STUBS and CONFIG_NUM_DYNAMIC_EXC_NO_ERR_STUBS
control how many stubs are created for exceptions that push
an error code, and no error code, respectively.

SW Interrupts are no longer triggered by "int <vector>" hard-coded
assembly instructions. Instead this is done by sending a self-directed
inter-processor interrupt from the LOAPIC, using a new API
loapic_int_vect_trigger(). In this way we get rid of dynamically
generated code in irq_test_common.h.

All interrupts call _loapic_eoi() when finished, since this is now
the right thing to do for all IRQs, including SW interrupts.

_irq_handler_set() for x86 no longer requires the old function pointer
to be supplied.

Change-Id: I78993d3d00dd153c9051c518b417cce8d3acee9e
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
2016-02-05 20:24:41 -05:00
Dan Kalowsky
2a63743192 cleanup: removing NOMANUAL
The \NOMANUAL tag is a remnant from days of yore and is no longer
needed or useful.  Cleaning up the code references to this.

Change-Id: I1b8cc9c9560d1dbb711f05fa63fd23386789875c
Signed-off-by: Dan Kalowsky <daniel.kalowsky@intel.com>
2016-02-05 20:24:35 -05:00
Anas Nashif
36579879c2 use zephyr.h instead of microkernel/nanokernel.h
Cleanup header inclusion and only include zephyr.h in samples
and applications.

Change-Id: If7460f4c6305a1c1cfcfdcf6a9bb7423f410c5c6
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2016-02-05 20:24:35 -05:00
Peter Mitsis
47888a31db Update static IDT generation to use IRQ priority
Updates the 'gen_idt' tool to generate a mapping of IRQ numbers to
interrupt vector IDs, thereby allowing the IRQ priority to be utilized
when statically connecting an interrupt.

Change-Id: I2e54ceb65145682820dfbd8ca1ee6ec68d71ce1a
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:24:34 -05:00
Javier B Perez Hernandez
f7fffae8aa Change BSD-3 licenses to Apache 2
Change all the Intel and Wind River code license from BSD-3 to Apache 2.

Change-Id: Id8be2c1c161a06ea8a0b9f38e17660e11dbb384b
Signed-off-by: Javier B Perez Hernandez <javier.b.perez.hernandez@linux.intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-02-05 20:24:29 -05:00
Peter Mitsis
56fa1a98d0 x86: Update generation of static IDT
Adds two new fields to the ISR_LIST structure (irq and priority) to allow
the decoupling of the vector ID and priority from the IRQ number at some
future time.

As a result of the addition of these two new fields, the gen_idt tool is
modified to both process these new fields as well as validate them.

Change-Id: I343dac68d99c78168a25b19784140f85d5db7578
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:24:28 -05:00
Peter Mitsis
ae448ff6ca Update galileo minimal footprint configuration
The galileo minimal footprint project requires at least 53 IDT entries
to accommodate the HPET.  This is due to the current algorithm used to
map an IRQ number to an interrupt vector.
            Interrupt vector = IRQ number + 0x20

Change-Id: I6de2cd72da631af04237615082823e7de65d8b22
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:24:28 -05:00
Dirk Brandewie
f37a4fcd71 kernel: kconfig: remove dependencies on EXPERIMENTAL
Remove the hard dependencies on EXPERIMENTAL symbol. Mark all the
symbols the relied on EXPERIMENTAL as EXPERIMENTAL in their prompt

Change-Id: I2779b0ed0776b3d510a8e2e44b35b83d7ad2377c
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2016-02-05 20:24:20 -05:00
Dirk Brandewie
ca97c3863d x86: collapse AUTOMATIC_FP_ENABLING into FP_SHARING
This avoids the case where the system has multiple threads using
floating point and the threads were not properly configured to use
floating point. The misconfigured threads will only take the fault on
first use of a floating point instruction.

Change-Id: I2be9f9f145bc4e7659e07154021ccc237774897b
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2016-02-05 20:24:20 -05:00
Dirk Brandewie
deea6b8518 samples: remove ENHANCED_SECURITY from project configs
The default for all architectures for ENHANCED_SECURITY is 'no' now
remove redundant config option.

Change-Id: Ib49b0bc7ea02aa2214fe45194393def8e021be01
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
2016-02-05 20:24:20 -05:00
Dirk Brandewie
c40bcf4454 arm: remove ENHANCED_SECURITY config from projects
The default for all architecures for ENHANCED_SECURITY is no remove
redundant config from arm project configs

Change-Id: I3915da20e0ee8298d69865ad5b07f9d5c6d59200
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
2016-02-05 20:24:20 -05:00
Dirk Brandewie
b2cd0aae54 x86: change the default for ENHANCED_SECURITY to no
Change the default for ENHANCED_SECURITY to no in preparation for the
option to be removed.

Change-Id: Ic46730b187f361226064a3e205f48433b0bebdd7
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
2016-02-05 20:24:20 -05:00
Anas Nashif
d617549950 sanity: do not run footprint-min on galileo
minimal footprint disable timer and galileo requires a timer

Change-Id: I75c08775fd02bae1221ae4102bb9873060c8e85f
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2016-02-05 20:24:19 -05:00
Benjamin Walsh
d41b82a649 latency_measure: fix lingering instance of NODE1
Change-Id: I01917076c8af9cd680baf4be534a87f6eeceb1cc
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-02-05 20:15:36 -05:00
Peter Mitsis
249d623210 Fix microkernel app_kernel benchmark
The event portion of the app_kernel benchmark no longer outputs the following
(abbreviated) error message:
   <path to project>/app_kernel/src/event_b.c:86 Error: tick occurred

This error was occurring as the benchmark test had hard-coded the value of
the event TEST_EVENT to 0 instead of defining it in the prj.mdef file.
Consequently, the system was using event 0 for the tick event; every time
task_event_send(TEST_EVENT) was invoked, the system treated it as a tick event.

Change-Id: I1a785a6594415bd4b0300d382f76a6d768641864
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:15:34 -05:00
Benjamin Walsh
2d12752637 sys_clock: make public some timing utilities
Make these public:

  - SECONDS(x): macro that gives the number of ticks in x seconds
  - MSEC(x): macro that gives the number of ticks in x milliseconds
  - MSEC_PER_SEC: number of milliseconds per second
  - USEC_PER_MSEC: number of microseconds per millisecond

Change-Id: Ic5dbf9349651a477b066edb0c6b6721da2b7e5bb
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-02-05 20:15:27 -05:00
Benjamin Walsh
849865046b benchmark/app_kernel: fix useless comment
The comment did not convey anything, as it was a relic from before a
previous renaming. Use the SECONDS(x) macro to make everything clearer.

Change-Id: Ia757061c4083d7567df5b214326c2cf8b6804fbf
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-02-05 20:15:27 -05:00
Daniel Leung
f06cae3775 samples/benchmark/footprint-min: disable UART console and serial
Previously, CONFIG_PRINTK being false means none of functions related to
the UART console and serial are compiled into the binary. This
effectively means UART console and serial drivers are disabled.
By decoupling serial drivers from console related configs, additional
options are needed to disable serial drivers and UART console driver
itself. So add those options here to disable UART console and serial,
or else the resulting binaries will be too bloated.

Change-Id: If526e42404f22caf6a550795f8277ba742625883
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
2016-02-05 20:15:25 -05:00
Daniel Leung
a4212108f7 serial: remove unused CONFIG_EXTRA_SERIAL_PORT
Change-Id: Ibb8ffcd377d9b7c34370c522fb06ce797f4feaed
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
2016-02-05 20:15:25 -05:00
Peter Mitsis
5fe44f42ba Update Title in sample project README.txt files
Assigns more descriptive titles to the sample project README.txt files.

Change-Id: I4a0efdac481a8ed75a847871dbfe686e74a9f113
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:15:21 -05:00
Peter Mitsis
92d1810def Fix typo: occured -> occurred
Change-Id: I40150719135108f18834a35db1c5be7ca4c5c9b2
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:15:21 -05:00
Benjamin Walsh
6469e578cb irq: do not use _inline versions of irq_lock/unlock
Standardize on using the irq_lock/irq_unlock (non-inline) symbols
everywhere.

The non-inline versions provide absolutely no benefits, so they will be
removed in a subsequent commit, and the inline versions will have their
_inline suffix removed.

Change-Id: Ib0b55f450447366468723e065a60adbadf7067a9
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-02-05 20:15:21 -05:00
Benjamin Walsh
a5a6ba8e4e microkernel: rename _k_server parameters
Reflect the fact that they are not used.

Change-Id: I6ea83cb2c7532e10988cbf4350edccb78f444328
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-02-05 20:15:21 -05:00
Benjamin Walsh
aa78793e40 microkernel: rename K_swapper to _k_server
Align with the newer terminology used for microkernel internal symbols.

Change-Id: I623b383f90d9e37a49429a79774c7f7a4953bd5f
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-02-05 20:15:21 -05:00
Benjamin Walsh
c1f9fd888d irq: make utility functions private
irq_handler_set, irq_priority_set and irq_disconnect have been made
private by prepending an underscore to their names:

	irq_handler_set -> irq_handler_set
	irq_priority_set -> irq_priority_set
	irq_disconnect -> irq_disconnect

The prototypes have been removed from header files when possible, and
extern statements used in C code where they were called.

_irq_priority_set() for ARM is still in the header file because
IRQ_CONFIG() relies on it.

Change-Id: I2ad585f8156ff80250f6d9eeca4a249a4477fd9d
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-02-05 20:15:21 -05:00
Benjamin Walsh
751c765079 events: rename task_event_set_handler()
task_event_set_handler -> task_event_handler_set

Align with the "verb at the end" convention.

Change-Id: I8b72d41a20a7fdd4756f90765682e317289a241b
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-02-05 20:15:21 -05:00
Benjamin Walsh
87564a4602 pipes/mailboxes: rename functions using mem blocks
task_pipe_put_async -> task_pipe_block_put

  task_mbox_put_async -> task_mbox_block_put

  task_mbox_data_get_async_block -> task_mbox_data_block_get
  task_mbox_data_get_async_block_wait -> task_mbox_data_block_get_wait
  task_mbox_data_get_async_block_wait_timeout ->
       task_mbox_data_block_get_wait_timeout

Previous names, focusing on 'async', were misleading, because:

- some of those APIs can be used synchronously as well
- other APIs can also do asynchronous transfer, and don't have 'async'
  in their names
- the key concept of these APIs is that they use memory pool blocks
  rather than raw data buffers.

Change-Id: I0c08a6cf950ab23bb4172ce25eb6f9886b037649
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-02-05 20:15:21 -05:00
Peter Mitsis
76db3ae424 Clean up microkernel sys_kernel configuration files
As no default platform configuration uses the PIC/PIT, the project
configuration file 'prj_console_pc8253.conf' is no longer required.

Change-Id: Ic91922e9431a2853bb5fdcdd3e31e39f3dce90c4
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:15:19 -05:00
Peter Mitsis
21832e3bf1 Clean up microkernel latency_measure configuration files
As no default platform configuration uses the PIC/PIT, the project
configuration file 'prj_pc8253.conf' is no longer required.

Change-Id: I89fac2685d9fca0452e5ce9d9b035e102bd62d70
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:15:19 -05:00
Peter Mitsis
db608ec123 Clean up microkernel app_kernel configuration files
Removes the following project configuration files:
 - prj_console_float_pc8253.conf : PIT is no longer used
 - prj_console_nofloat_*.conf    : unsupported by Makefile

Change-Id: I72689fa56413947f3a552645c7b2ed5ad599ed71
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:15:19 -05:00
Andrew Boie
6acbe63aea initial commit for next-gen sanity checks
The online help ./scripts/sanitycheck --help describes usage.
Most users will simply want to run with no arguments.

Change-Id: Icedbbfc22599a64a6e3dbbb808ff3276db06f2e0
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
2016-02-05 20:14:42 -05:00
Peter Mitsis
310c63e386 Update microkernel boot_time project
Removes references to old platform names.

Change-Id: I53e9994c794c6b4c292e776355a67b7923c2fdb8
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:14:39 -05:00
Peter Mitsis
9d63adf3ea Renames supported platform configurations
Renames supported platform configurations to conform to new platform
configuration naming scheme.

Example usage with PLATFORM_CONFIG:
    make PLATFORM_CONFIG=basic_cortex_m3
    make PLATFORM_CONFIG=basic_atom
    make PLATFORM_CONFIG=basic_minuteia
    make PLATFORM_CONFIG=galileo

  xxx_ti_lm3s6965_defconfig           -> xxx_basic_cortex_m3_defconfig
  xxx_generic_pc_atom_n28xx_defconfig -> xxx_basic_atom_defconfig
  xxx_generic_pc_minuteia_defconfig   -> xxx_basic_minuteia_defconfig
  xxx_quark_defconfig                 -> xxx_galileo_defconfig

Change-Id: I696eb8b9ad9a72d7a72efbe1341ce23500335764
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:14:39 -05:00
Peter Mitsis
519351ee92 Use PLATFORM_CONFIG to specify configuration
Uses PLATFORM_CONFIG to specify the configuration file instead of
KBUILD_DEFCONFIG.  This name is more intuitive to Zephyr users and
it is not tied to kbuild.

Example usage:
    make PLATFORM_CONFIG=generic_pc_atom_n28xx
    make PLATFORM_CONFIG=generic_pc_minuteia
    make PLATFORM_CONFIG=quark
    make PLATFORM_CONFIG=ti_lm3s6965
    make PLATFORM_CONFIG=fsl_frdm_k64f

Change-Id: I177608942c3e77c2f152743c862aad1d460c0e33
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:14:38 -05:00
Peter Mitsis
9690835e32 sample projects: Remove generic_pc and pentium4 support
The generic_pc and generic_pc_pentium4 platform configurations are not
essential configurations to Zephyr.

Change-Id: Idd384bc7f180c035b1467e8b56fbfe206604658f
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:14:38 -05:00
Peter Mitsis
3b33a3b437 sample projects: change default KBUILD_DEFCONFIG
Changes default KBUILD_DEFCONFIG to xxx_generic_pc_atom_n28xx_defconfig as
the xxx_generic_pc_defconfig configuration will not be supported in the future.
Note that like generic_pc, atom_n28xx runs on QEMU.

Change-Id: I49c5708e4b24dbf723eefc1efddfea4174d9cb1c
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:14:38 -05:00
Peter Mitsis
85d9f0c827 Microkernel sample projects no longer use BSP
Microkernel sample projects now use KBUILD_DEFCONFIG instead of BSP.  This
is a necessary step in transitioning from BSPs to platforms.

Change-Id: I916819262cabf70296e15d9b1321fc383b88a805
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:14:38 -05:00
Anas Nashif
f367f071b6 doxygen: add @brief and capitalize
Remove function name from comment and add @brief instead.
Also capitilize first letter.

Change-Id: Ib708b49bf02e5bc89b0066637a55874e659637e0
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2016-02-05 20:14:33 -05:00
Anas Nashif
1362e3c162 doxygen: RETURNS: -> @return
Previous comment style used RETRURNS:, use @return to comply
with javadoc style.

Change-Id: Ib1dffd92da1d97d60063ec5309b08049828f6661
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2016-02-05 20:14:32 -05:00
Anas Nashif
ea0d0b220c doxygen: change comment style to match javadoc
The change replaces multiple asterisks to ** at
the beginning of comments and adds a space before
the asterisks at the beginning of lines.

Change-Id: I7656bde3bf4d9a31e38941e43b580520432dabc1
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2016-02-05 20:14:32 -05:00
Dmitriy Korovkin
660878e4e2 irq_connect for x86 uses static stub array
In order to provide the same irq_connect() on all platforms
on x86, irq_connect() now uses a static array of interrupt
stubs. Device driver does not need to provide interrupt stub
to irq_connect() function.

Add NUM_DYNAMIC_STUBS configuration parameter, the number
of interrupt stubs used for dynamic interrupt registration.

Modify tests for unified interrupt register API

Tests that deal with interrupts are modified to work
with the new interrupt registration API.

Add CONFIG_NUM_DYNAMIC_STUBS option to dynamic interrupt projects

Projects that use dynamic interrupt handler registration on x86
have to include CONFIG_NUM_DYNAMIC_STUBS parameter in the
configuration.

Change-Id: Ic90c726485521a57cf695fd3edc8cac85d0b827d
Signed-off-by: Dmitriy Korovkin <dmitriy.korovkin@windriver.com>
2016-02-05 20:14:25 -05:00
Peter Mitsis
9bf659afa5 Introduce CPU_CORTEX_M3_M4 option
CPU_CORTEX_M3_M4 replaces CPU_CORTEXM3 as the umbrella option for Cortex M3/M4
processors.

NOTE: Selecting CPU_CORTEXM4 still currently forces the selection of
CPU_CORTEXM3.  Breaking that forced select will be done in a later commit.

Change-Id: I0f36b3a2adc5c6c66db4e9b6353b921199544deb
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
2016-02-05 20:14:25 -05:00
Allan Stephens
c82e6e8ae3 Cosmetic changes to sys_kernel output
Eliminates confusing references to "channel", and improves
readability of project output.

Change-Id: Ib4f699caae5a015832207a408bd168903e791756
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
2016-02-05 20:14:19 -05:00