06-10-2008
Why do you want a different IP address every time?
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Last question for today!! :rolleyes:
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Hi All ,
please view the set up below:
-------------------------------------------------------------------
| DHCP Server |-----------| ROUTER & |-----------| Clients |
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... (2 Replies)
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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)