How to convert a partition usin 64 bits kernel to 32 bits kernel? Post: 302226012

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Operating Systems AIX How to convert a partition usin 64 bits kernel to 32 bits kernel? Post 302226012 by samsungsamsung on Monday 18th of August 2008 03:20:58 AM

08-18-2008

Registered User

If you want to enable 64-bit kernel after system installation, you will need to
instruct the system to use the 64-bit kernel information stored in the /usr/lib/boot
directory. There are two kernels available in the /usr/lib/boot directory:
unix_mp 32-bit kernel for multiprocessor systems
unix_64 64-bit kernel for 64-bit processor systems

The following example provides the commands to run to enable the 64-bit kernel
after system installation:

# ln -sf /usr/lib/boot/unix_64 /unix
# ln -sf /usr/lib/boot/unix64 /usr/lib/boot/unix
# bosboot -ad /dev/ipldevice
bosboot: Boot image is 23137 512 byte blocks.
# shutdown -r

After the system has rebooted, it will be running the 64-bit kernel. To reactivate
the 32-bit kernel, follow the same procedure, substituting unix_mp for unix_64,
depending on your system type.

To verify your settings, execute the following command:
# ls -al /unix
lrwxrwxrwx 1 root system 21 Nov 11 11:30 /unix -> /usr/lib/boot/unix_64

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LEARN ABOUT OSF1

kseg_to_phys

KSEG_TO_PHYS(9r)														  KSEG_TO_PHYS(9r)

NAME

       KSEG_TO_PHYS - General: Converts a kernel-unmapped virtual address to a physical address

SYNOPSIS

       vm_offset_t KSEG_TO_PHYS(
	       vm_offset_t addr );

ARGUMENTS

       Specifies the buffer virtual address to convert to a physical address.

DESCRIPTION

       The  KSEG_TO_PHYS  routine  converts  a	kernel-unmapped virtual address to a kernel physical address. Device drivers can use this physical
       address in DMA operations. Prior to calling KSEG_TO_PHYS, device driver writers often call one  of  the	following  routines  to  determine
       whether the address passed is a virtual address in the addressed kernel segment: IS_KSEG_VA

	      Determines if the specified address is located in the kernel-unmapped address space.  IS_SEG0_VA

	      Determines if the specified address is located in the user-mapped address space.	IS_SEG1_VA

	      Determines if the specified address is located in the kernel-mapped address space.

RETURN VALUES

       Upon successful completion, KSEG_TO_PHYS returns the physical address.

EXAMPLE

       The following code fragment shows a call to KSEG_TO_PHYS:

       .  .  .

       caddr_t virt_addr;  [1] unsigned phys_addr; [2]

       .  .  .

	   if(IS_KSEG_VA(virt_addr)) { [3]
	       phys_addr = KSEG_TO_PHYS(virt_addr); [4]

       .  .  .

       Declares  a  variable  to  store  the  user  buffer's  virtual  address.   Declares  a  variable  to store the physical address returned by
       KSEG_TO_PHYS.  Before calling KSEG_TO_PHYS, calls IS_KSEG_VA to determine if the virtual address is from the kernel-unmapped address space.
       If  the virtual address is from the kernel-unmapped address space, then calls KSEG_TO_PHYS to convert the address to a corresponding physi-
       cal address.

SEE ALSO

       Routines: IS_KSEG_VA(9r), PHYS_TO_KSEG(9r)

																  KSEG_TO_PHYS(9r)