Commit Graph

87 Commits

Author SHA1 Message Date
oliviermartin 695df8ba90 ArmPlatformPkg: Introduction of gArmPlatformTokenSpaceGuid.PcdCoreCount
On ARM PLatforms, there is no standard way to know how many cores are
available on the platform.
This PCD is expected to contain this number.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13769 6f19259b-4bc3-4df7-8a09-765794883524
2012-09-28 10:43:28 +00:00
oliviermartin 0a6653bc2a ArmPkg/BdsLib: Added FDT support for BdsLib
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13768 6f19259b-4bc3-4df7-8a09-765794883524
2012-09-28 09:58:42 +00:00
oliviermartin 619b399888 ArmPkg/DefaultExceptionHandlerLib: Added support to the BASE-type library
This library could be used before the UEFI phases to expose the CPU state
when an unexpected exception interrupt the firmware.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13767 6f19259b-4bc3-4df7-8a09-765794883524
2012-09-28 09:55:48 +00:00
oliviermartin 9d6b024ded ArmPlatformPkg/Sec: Moved Exception Vector Table to ArmPkg/DebugAgentBaseLib
In case a DebugAgent library is supported for a specific debugger, we would
expect the exception be caught by DebugAgentLib.
The DebugAgentBaseLib exposes the cause of the exception to the user in the
Serial Terminal.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13765 6f19259b-4bc3-4df7-8a09-765794883524
2012-09-28 09:52:11 +00:00
oliviermartin e1772adfef ARM Packages: Replaced the build of Fat driver and EBL by the binaries of Fat driver and UEFI Shell
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13758 6f19259b-4bc3-4df7-8a09-765794883524
2012-09-27 15:31:54 +00:00
oliviermartin f2e6099a35 ArmPlatformPkg: Fixed ArmRealViewEb & BeagleBoard builds
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13589 6f19259b-4bc3-4df7-8a09-765794883524
2012-08-02 18:21:16 +00:00
oliviermartin 92034e14da ARM Packages: Clean code (Remove unused PCDs, ...)
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13494 6f19259b-4bc3-4df7-8a09-765794883524
2012-07-04 20:12:29 +00:00
oliviermartin 2575b72620 ArmPkg: Fixed RVCT compiler warnings
Signed-off-by: Olivier Martin <olivier.martin@arm.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13490 6f19259b-4bc3-4df7-8a09-765794883524
2012-07-04 20:06:23 +00:00
oliviermartin f8181c90f4 ArmPlatformPkg: Replaced 'ArmGicSecLib' by 'ArmGicLib'
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13265 6f19259b-4bc3-4df7-8a09-765794883524
2012-05-02 20:19:00 +00:00
oliviermartin e314d564db ArmPlatformPkg: Introduced 'ArmPlatformSecLib'
The function only used in Secure Firmware used to be mixed with
the Non-Secure/Normal functions in ArmPlatformLib.
When the Secure Firmware was not required for some platforms (eg:
BeagleBoard), these functions were empty functions.
This new interface has been created to clean the ArmPlatformLib
interface between the SEC and PEI phases.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13260 6f19259b-4bc3-4df7-8a09-765794883524
2012-05-02 20:13:32 +00:00
oliviermartin 7fffeef9be ARM Packages: Fixed th 'NS' (Non Secure) bit in the MMU page Table Descriptor
The 'NS' bit must only be set in Secure world to define the Non-Secure region
of the Non-Secure World.
This bit must not be set in Non-Secure World.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13252 6f19259b-4bc3-4df7-8a09-765794883524
2012-05-02 20:00:54 +00:00
oliviermartin f437141a9c ArmPlatformPkg: Renamed and Invoked earlier ArmPlatformNormalInitialize()
- ArmPlatformNormalInitialize() has been renamed into ArmPlatformInitialize()
- Make the function be called at the early stage of the PEI phase as some
  platforms require their interconnects or clocks to be initialize before any
  access to Timers or UARTs.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13245 6f19259b-4bc3-4df7-8a09-765794883524
2012-05-02 19:49:35 +00:00
oliviermartin e9f7c58f25 ArmPkg: Replaced gArmTokenSpaceGuid.PcdGicNumInterrupts by ArmGicGetMaxNumInterrupts()
The maximum number of interrupts can be retrieve through the GIC distributor.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13244 6f19259b-4bc3-4df7-8a09-765794883524
2012-05-02 19:48:00 +00:00
oliviermartin 82325f95c5 ARM Packages: Minor changes (fixed mispelling, line endings, incorrect comments)
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13243 6f19259b-4bc3-4df7-8a09-765794883524
2012-05-02 19:46:40 +00:00
oliviermartin ff4d6bb315 ArmPlatformPkg: Fixed build after latest BaseTools syncup
BaseTools now raises an error when a PCD is not declared in a DEC.
This change:
- Remove undeclared PCDs
- Add PCD declaration to DEC file

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13195 6f19259b-4bc3-4df7-8a09-765794883524
2012-04-13 10:17:39 +00:00
oliviermartin 8dd9e159b9 ArmPlatformPkg: Fixed gcc build (minor change)
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13136 6f19259b-4bc3-4df7-8a09-765794883524
2012-03-26 11:04:25 +00:00
oliviermartin 5e7731443c ArmPlatformPkg/Sec: Allowed the Secondary Cores to set the Secure/Non Secure bits to their PPIs
The GICD_IGROUPR0 is banked for each connected processor. It means the
Non-Secure bits for the PPIs (Private Peripheral Interrupts) must be
configured for every processor.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13135 6f19259b-4bc3-4df7-8a09-765794883524
2012-03-26 11:03:36 +00:00
oliviermartin 793ae6eeb3 ARM Packages: Added the NULL implementation of CpuExceptionHandlerLib
This NULL implementation should not affect the existing code flow and
avoid the builds to be broken by a missing dependency.
In a longer term, an implementation of CpuExceptionHandlerLib should
be provided for ARM architecture.

Signed-off-by: oliviermartin



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13103 6f19259b-4bc3-4df7-8a09-765794883524
2012-03-15 16:03:41 +00:00
oliviermartin af0283b82b ArmPlatformPkg/ArmPlatformSysConfigLib: Removed dependency on Uefi.h since it is a Base Library
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13072 6f19259b-4bc3-4df7-8a09-765794883524
2012-02-29 17:21:17 +00:00
oliviermartin 68dda854c6 ArmPlatformPkg/NorFlashDxe: Fixed CFI NOR Flash driver
CFI Flash differentiates DeviceBaseAddress with BlockAddress in
its protocol. The DeviceBaseAddress was not considered in the
previous version of this driver.
This version also fixes some bugs in the implementation of the
CFI protocol.

This new version also uses the Boot Mode Hob to reinitialized the
FVB when Boot Mode is equal to BOOT_WITH_DEFAULT_SETTINGS.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13064 6f19259b-4bc3-4df7-8a09-765794883524
2012-02-28 17:32:47 +00:00
oliviermartin 8cc852f791 ArmPlatformPkg: Move the Secure Monitor initialization into a separate 'ArmTrustedMonitorLib' library
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13059 6f19259b-4bc3-4df7-8a09-765794883524
2012-02-28 17:27:15 +00:00
oliviermartin 0db25ccc6c ArmPlatformPkg: Minor code changes (comments, misspellings, coding stylei, line endings)
- Fixed misspellings
- Updated Copyright
- Remove unused sections in INF file
- Fixed incorrect commentsi
- Fixed coding style
- Fixed line endings (CRLR)



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13052 6f19259b-4bc3-4df7-8a09-765794883524
2012-02-28 17:11:42 +00:00
oliviermartin 947a14a0a8 ArmPlatformPkg: Fix ARM EB and VE builds
The EDID protocol defintions were missing from their ArmPlatformLcdLib.inf INF files.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12878 6f19259b-4bc3-4df7-8a09-765794883524
2011-12-15 18:54:18 +00:00
oliviermartin c7b7c44598 ArmPlatformPkg: Renamed 'DebugSecExtraActionLib' into 'ArmPlatformSecExtraActionLib'
This library interface is not related to adding extra action to debug support.
But it adds extra action to the ArmPlatform/Sec component.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12861 6f19259b-4bc3-4df7-8a09-765794883524
2011-12-14 10:39:07 +00:00
oliviermartin 6d8d736334 ArmPlatformPkg/LcdPlatformLib: Produce the protocols EFI_EDID_DISCOVERED_PROTOCOL and EFI_EDID_ACTIVE_PROTOCOL
These two EDID protocols are excepted to be produced by the GOP.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12860 6f19259b-4bc3-4df7-8a09-765794883524
2011-12-14 10:35:04 +00:00
oliviermartin d48e4b19ae ArmPlatformPkg: Fix PrePi firmwares for ArmRealViewEb
The SEC component was using the wrong library for the Global Variable region.




git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12633 6f19259b-4bc3-4df7-8a09-765794883524
2011-11-01 23:39:17 +00:00
oliviermartin 8d0fe26cbf ArmPlatformPkg: Remove ArmPlatformBootRemapping() function from the ArmPlatformLib
Memory map remapping is a platform specific feature only enabled by some platforms.
Instead of keeping this function empty for most platforms, the function has been
removed. This feature can easily fit in any other ArmPlatformLib function.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12632 6f19259b-4bc3-4df7-8a09-765794883524
2011-11-01 23:36:59 +00:00
oliviermartin 886f97c86b ARM Packages: Fixed Build failings/warnings/EDK2 coding convention
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12458 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-27 16:42:47 +00:00
oliviermartin 12c5ae238e ArmPlatformPkg: Replaced 'ArmPlatformTrustzoneSupported' by the fixed Pcd gArmTokenSpaceGuid.PcdTrustzoneSupport
This change does not make possible to disable Trustzone from the firmware.
The firmware has to be built for Trustzone support enabled or disabled.

The memory page table are now defined as 'Normal Memory' in any case.
Except for RTSM Device Memory which as to be Secure Device Memory due
to a RTSM bug.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12452 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-27 16:29:07 +00:00
oliviermartin 4103bc94fb ArmPlatformPkg: Replaced '!if' conditions by more appropriate '!ifdef' conditions
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12451 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-27 16:27:05 +00:00
oliviermartin aa84fef5fe ArmPkg: Removed 'ArmV7/ArmV7MPCore*' files
These files were Cortex A9 specific. The A9 specific functions have
moved to ArmCpuLib/ArmCortexA9Lib.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12449 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-27 16:24:30 +00:00
oliviermartin 90d6a1bbf1 ArmPkg: Introduce ArmCpuLib to abstract ARM Cpu specific initialization
Every CPUs have their own initialization requirements.
This library allows to allows to abstract these initialization requirements
into the ARM Platform common components.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12448 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-27 16:22:09 +00:00
oliviermartin f4ee7a8234 ArmPlatformPkg/ArmRealViewEbPkg: Introduce 'ArmRealViewEb.dsc.inc' to avoid duplication of library and PCD defintions around ARM RealView Emulation Boards
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12427 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 23:19:23 +00:00
oliviermartin c21e237866 ArmPlatformPkg/ArmRealViewEbPkg: Removed unused 'Pei' module
ArmRealViewEbPkg is now using the ArmPlatform Common modules (ArmPlatformPkg/Sec
and ArmPlatformPkg/PrePeiCore).



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12425 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 23:16:56 +00:00
oliviermartin 1d2bbdbb8d ArmPkg: Removed deprecated 'ArmMPCoreMailBoxLib'
This library has been replaced by ArmMpCoreInfo PPI and HOBs.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12424 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 23:16:04 +00:00
oliviermartin 44788bae6f ArmPkg: Create MpCoreInfo PPI and HOB to describe CPU Cores on a MPCore platform
These info are:
- ClusterId, CoreId
- MailBox Set/Get/Clear address



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12423 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 23:14:01 +00:00
oliviermartin 77de7e5372 ArmPlatformPkg: Add ArmPlatformGetPlatformPpiList()
This function exposes the Platform Specific PPIs. They can be used by
any PrePi modules or passed to the PeiCore by PrePeiCore



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12422 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 23:12:23 +00:00
oliviermartin f92b93c9a3 ARM Packages: Rename PcdNormal* into Pcd* PCDs
The denomination 'Normal' was used to make reference to the 'Normal'
or 'Non Secure' or 'Non Trusted' world.
To avoid confusion, this prefix has been removed from PCDs to define
the normal world.

The PCDs explicitely related to the Secure/Trusted World continue to
have the 'Sec' prefix.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12416 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 23:06:31 +00:00
oliviermartin 2dbcb8f0a3 ArmPlatformPkg: Changed memory model for the stacks
In the previous version, every cores had the same stack size.
To avoid to waste memory with secondary core stacks, the primary core stack
size is now different from the secondary cores stack size.

These are the Stack PCDs and their default values:

gArmPlatformTokenSpaceGuid.PcdCPUCoresSecStackBase|0
gArmPlatformTokenSpaceGuid.PcdCPUCoreSecPrimaryStackSize|0x10000
gArmPlatformTokenSpaceGuid.PcdCPUCoreSecSecondaryStackSize|0x1000

gArmPlatformTokenSpaceGuid.PcdCPUCoresSecMonStackBase|0
gArmPlatformTokenSpaceGuid.PcdCPUCoreSecMonStackSize|0x1000

gArmPlatformTokenSpaceGuid.PcdCPUCoresStackBase|0
gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize|0x10000
gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize|0x1000




git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12415 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 23:05:20 +00:00
oliviermartin f156d5b49d ArmPlatformPkg/ArmPlatformLib: Removed 'ArmPlatformIsMemoryInitialized' function
'ArmPlatformInitializeBootMemory' function can check if the memory has already
been initialized.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12414 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 23:04:06 +00:00
oliviermartin 44e272fd6a ArmPlatformPkg/ArmPlatformLib: Introduce ArmPlatformSecBootAction function
This function is called at the initial stage of the Secure boot process to allow
platform vendors to add early actions.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12413 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 23:02:13 +00:00
oliviermartin 0787bc6184 ArmPlatformPkg: Introduce Primary core macros
On MpCore system, the primary core can now be any core of the system.

To identify the primary core, you can use 'gArmTokenSpaceGuid.PcdArmPrimaryCoreMask'
and 'gArmTokenSpaceGuid.PcdArmPrimaryCore'.
These PCDs by default use the ClusterId and CoreId to identify the core. And the
primary core is defined as the ClusetrId=0 and CoreId=0.

The helper macros are: IS_PRIMARY_CORE(MpId), GET_CORE_ID(MpId), GET_CLUSTER_ID(MpId),
GET_CORE_POS(MpId), PRIMARY_CORE_ID.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12412 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 23:01:13 +00:00
oliviermartin 55a0d64b88 ArmPkg: Renamed library 'PL390GicLib' into 'ArmGicLib'
This library is the interface for the ARM Generic Interrupt Controller
Architecture Specification.
ARM Platform can use any GIC controller (not necessary PL390 GIC).




git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12411 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 22:59:52 +00:00
oliviermartin 11c20f4e06 Arm Packages: Fixed coding style/Line endings to follow EDK2 coding convention
Arm Packages: Fixed mispelling

Arm Packages: Reduced warnings all over the code




git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12407 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-22 22:53:54 +00:00
oliviermartin 6740ea74e2 Clean up Rules of Platform FDFs to apply only one EFI image and Depex for each driver
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12285 6f19259b-4bc3-4df7-8a09-765794883524
2011-09-06 18:41:55 +00:00
oliviermartin c8ece79ccd ArmPlatformPkg: Fix ARM RealView EB and VE builds (2)
This file is missing from the earlier commit (ArmPlatformPkg: Fix ARM RealView EB and VE builds).



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12235 6f19259b-4bc3-4df7-8a09-765794883524
2011-08-30 17:12:13 +00:00
oliviermartin cc1e814923 ArmPlatformPkg: Fix ARM RealView EB and VE builds
Tested with RVCTLINUX and ARMGCC toolchains.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12233 6f19259b-4bc3-4df7-8a09-765794883524
2011-08-30 16:54:48 +00:00
oliviermartin 1d36ec02a5 ArmPkg: Fix ARM builds for XCode32
- Build BeagleBoardPkg, ArmRealViewEb-A8, ArmRealView-A9x2 and ArmVExpress-CTA9x4




git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12055 6f19259b-4bc3-4df7-8a09-765794883524
2011-07-28 14:58:52 +00:00
oliviermartin 65cd89d008 ArmPkg/DebugAgentSymbolsOnlyLib: Add library to print loaded address of the SEC and PEI_CORE modules
This library that uses the DebugAgentLib interface prints the loaded addresses
of the SEC and PEI_CORE module using PeCoffExtraActionLib.

Note: Because there is no PE loader for these XIP modules, PeCoffExtraActionLib is not invoked.
This library scans the firmware volume to find these modules and calculate their fixup loaded
addresses used to load their symbols in the debugger.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12023 6f19259b-4bc3-4df7-8a09-765794883524
2011-07-18 10:27:12 +00:00
oliviermartin d269095b71 ArmPlatformPkg: Change the memory model for the ARM Platform components
In the former memory model, the UEFI firmware was expected to be located
at the top of the system memory. Stacks & Pi memory regions were set below
the firmware.
On some platform, the UEFI firmware could be shadowed by the ROM firmware
(case of the BeagleBoard) and in some cases the firmware is copied at the
beginning of the system memory.

With this new memory model, stack and Pi/DXE memory regions are set at the
top of the system memory wherever the UEFI firmware is located in the memory
map.
Because DXE core does not support shadowed firmwares, the system memory covered
by the UEFI firmware is marked as 'Non Present' to avoid to be overlapped by
DXE allocations.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11992 6f19259b-4bc3-4df7-8a09-765794883524
2011-07-06 16:27:21 +00:00