create partition on mac

1. fdisk -e /dev/disk4

2. auto hfs

3. w

4. newfs_hfs /dev/disk4s1

5. diskutil mountDisk disk4s1

xcode build and gcc for universal binary

xCode
General-->Cross-Develop Using Target SDK:
Max-OS x 10.5
Then you can use features available on 10.5

build -> Architectures ( from target file):
按住mouse，之後手動輸入i386, x86_64, ppc ppc64

build --> Mac OS X Deployment Target
Mac os X 10.4
This is the minimum OS version you want to support

gcc
use -arch i386 -arch ppc
ex:
the object file generated is test.o
file test.o:
test.o (for architecture ppc7400): Mach-O object ppc
test.o (for architecture i386): Mach-O object i386

判斷 intel or power pc on mac

// for powerPC
#if __BIG_ENDIAN__
printf("big endian\n");
// for Intel
#else
printf("little endian\n");
#endif

pdisk

Apple partition table editor
(the disk must use Apple_partition_scheme. If it uses GUID_partition_scheme, pdisk can not use)

(1) input e
edit device's map
input /dev/disk2
the name of device to change is /dev/disk2

(2input c)
create a partition, with default= Apple_HFS
First block: 64
Length in blocks: 20000
Name of partition: par1

input t
change partition type
input MyPartitionType

(3) input w
write the partition table

registerService

為了要讓clients可以找到driver，
要先呼叫registerService()

ex:
有個driver com_MySoftwareCompany_driver_SampleINQUIRYDriver，
在它的start function呼叫registerService()

bool com_MySoftwareCompany_driver_SampleINQUIRYDriver::start(IOService* provider)
{
bool success;

IOLog("SampleINQUIRYDriver::start()\n");

success = super::start(provider);

if (success) {
// Publish ourselves so clients can find us
registerService();
}

return success;
}

info.plist's IOMatchCategory and IOProbeScore

IOMatchCategory is a special property list element that allows multiple drivers to match on a single nub.

Hence, if there are two drivers for IOSCSILogicalUnitNumber, they are both attached to device.

If you want only the most suitable driver, do not set IOMatchCategory. And use IOProbeScore to give the driver you want higher score

size and IOConnectMethodStructureIStructureO

傳入IOConnectMethodStructureIStructureO之類function的output buffer size大小，
即為此buffer的大小，
所以即使buffer容量為10 byte，
若size傳入5 byte，
最後只會寫入5 byte的資料到buffer。

SCSITaskStatus

in SCSITask.h

kSCSITaskStatus_GOOD = 0x00,
kSCSITaskStatus_CHECK_CONDITION = 0x02,
kSCSITaskStatus_CONDITION_MET = 0x04,
kSCSITaskStatus_BUSY = 0x08,
kSCSITaskStatus_INTERMEDIATE = 0x10,
kSCSITaskStatus_INTERMEDIATE_CONDITION_MET = 0x14,
kSCSITaskStatus_RESERVATION_CONFLICT = 0x18,
kSCSITaskStatus_TASK_SET_FULL = 0x28,
kSCSITaskStatus_ACA_ACTIVE = 0x30,
kSCSITaskStatus_TaskTimeoutOccurred = 0x01,
kSCSITaskStatus_ProtocolTimeoutOccurred = 0x02,
kSCSITaskStatus_DeviceNotResponding = 0x03,
kSCSITaskStatus_DeviceNotPresent = 0x04,
kSCSITaskStatus_DeliveryFailure = 0x05,
kSCSITaskStatus_No_Status = 0xFF

LOSleep and IOLog

Sleep the calling thread for a number of milliseconds

void IOSleep(unsigned milliseconds);

use IOSleep let the message write to log by IOLog complete

OSTypeAlloc

Allocate an instance of the desired object.
#define OSTypeAlloc(type)


ex:
OSTypeAlloc(com_apple_dts_SCSIEmulator);

appleRAID

command:
diskutil createRAID mirror MyArray JHFS+ disk2s4 disk2s5

new RAID is disk3
it is composed of Untitled@4(disk2s4) and Untitled@5(disk2s5)

command:
delete raid:
diskutil destroyRAID disk3

appleRAID test program: artest
create new RAID set
artest --create --name myRAID --level mirror disk2s4 disk2s5

test AppleRAID-3.0.19 driver
when creating RAID, not use mirror
Because there are some errors in AppleRAIDMirrorSet.cpp

delete driver catch

delete the extensions.mkext and extensions.kextcache in /System/Library

SCSI Domain Identifier

SCSI Domain Identifier = bus id = kIOPropertySCSIDomainIdentifierKey
SCSI Target identifier = scsi target id = kIOPropertySCSITargetIdentifierKey
SCSI Logical Unit Number = lun = kIOPropertySCSILogicalUnitNumberKey

IOSleep

IOSleep(unsigned milliseconds);
puts the currently executing thread to sleep for a certain period of time

probe() in mac driver

driver判斷要match到哪一個device:
driver和device溝通，決定device是否適合。

compile with framework

compile files that connect to user client in the kernel:
IOKit, CoreFoundation, ApplicationServices

iolog

defined in IOLib.h


Log a message to console in text mode, and /var/log/system.log.

SCSI Inquiry command

ENOSYS

ENOSYS:
error code

create SCSI command

IOSCSIPrimaryCommandsDevice.h.