Time Class Reference

System Time server. More...

#include <Time.h>

Inheritance diagram for Time:

Public Member Functions
	Time (const u32 inode)
	Constructor. More...
virtual FileSystem::Result	initialize ()
	Initialize the time device. More...
virtual FileSystem::Result	read (IOBuffer &buffer, Size &size, const Size offset)
	Read time. More...
Public Member Functions inherited from Device
	Device (const u32 inode, const FileSystem::FileType type)
	Constructor. More...
virtual	~Device ()
	Destructor. More...
virtual const String &	getIdentifier () const
	Get unique device identifier. More...
virtual FileSystem::Result	interrupt (const Size vector)
	Called when an interrupt has been triggered for this device. More...
Public Member Functions inherited from File
	File (const u32 inode, const FileSystem::FileType type=FileSystem::RegularFile, const UserID uid=ZERO, const GroupID gid=ZERO)
	Constructor function. More...
virtual	~File ()
	Destructor function. More...
u32	getInode () const
	Get inode number. More...
FileSystem::FileType	getType () const
	Retrieve our filetype. More...
virtual FileSystem::Result	write (IOBuffer &buffer, Size &size, const Size offset)
	Write bytes to the file. More...
virtual FileSystem::Result	status (FileSystem::FileStat &st)
	Retrieve file statistics. More...
virtual bool	canRead () const
	Check if the File has data ready for reading. More...
virtual bool	canWrite () const
	Check if the File can be written to. More...

Private Member Functions
unsigned char	readCMOS (unsigned char addr)
	Returns the value stored at the given address from the CMOS. More...
unsigned	bcd2bin (unsigned char val)
	Convert from binary coded decimal to binary form. More...

Private Attributes
Arch::IO	m_io
	Port I/O object. More...

Additional Inherited Members
Protected Attributes inherited from Device
String	m_identifier
	Unique identifier for this Device. More...
Protected Attributes inherited from File
const u32	m_inode
	Inode number. More...
const FileSystem::FileType	m_type
	Type of this file. More...
UserID	m_uid
	Owner of the file. More...
GroupID	m_gid
	Group of the file. More...
FileSystem::FileModes	m_access
	Access permissions. More...
Size	m_size
	Size of the file, in bytes. More...

Detailed Description

System Time server.

This server is responsible for maintaining the global system time via the CMOS. A lot of this code comes from the linux kernel source, particularly from the file arch/x86/kernel/rtc.c.

See also

http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.30.y.git;a=blob_plain;f=arch/x86/kernel/rtc.c;hb=HEAD

Definition at line 95 of file Time.h.

Constructor & Destructor Documentation

Time()

Time::Time

(

const u32

inode

)

Constructor.

Parameters

inode

Inode number

Definition at line 27 of file Time.cpp.

References Device::m_identifier.

Member Function Documentation

bcd2bin()

unsigned Time::bcd2bin ( unsigned char  val )

private

Convert from binary coded decimal to binary form.

Parameters

val	The value to convert.

Returns

A binary integer.

Definition at line 100 of file Time.cpp.

Referenced by read().

initialize()

FileSystem::Result Time::initialize ( )

virtual

Initialize the time device.

Returns

Result code

Reimplemented from Device.

Definition at line 33 of file Time.cpp.

References FileSystem::Success.

read()

FileSystem::Result Time::read ( IOBuffer &  buffer, Size &  size, const Size  offset  )

virtual

Read time.

Parameters

buffer	Input/Output buffer to output bytes to.
size	Maximum number of bytes to read on input. On output, the actual number of bytes read.
offset	Offset inside the file to start reading.

Returns

Result code

Reimplemented from File.

Definition at line 38 of file Time.cpp.

References bcd2bin(), CMOS_YEARS_OFFS, mktime(), readCMOS(), RTC_BCD, RTC_DAY_OF_MONTH, RTC_HOURS, RTC_MINUTES, RTC_MONTH, RTC_SECONDS, RTC_STATUS_A, RTC_STATUS_B, RTC_UIP, RTC_YEAR, snprintf(), FileSystem::Success, and IOBuffer::write().

readCMOS()

unsigned char Time::readCMOS ( unsigned char  addr )

private

Returns the value stored at the given address from the CMOS.

Parameters

addr	The address to read from the CMOS

Returns

The value at the given address.

Note

I almost copied this code completely from the linux source from the file arch/x86/kernel/rtc.h so you should also take a look over there how they do it.

Definition at line 94 of file Time.cpp.

References m_io, and RTC_PORT.

Referenced by read().

Field Documentation

m_io

Arch::IO Time::m_io

private

Port I/O object.

Definition at line 154 of file Time.h.

Referenced by readCMOS().

---

The documentation for this class was generated from the following files:

• server/time/Time.h
• server/time/Time.cpp