Unix and Linux Discussions Tagged with ip address |
|
Thread / Thread Starter |
Last Post |
Replies |
Views |
Forum |
|
|
|
0 |
4,366 |
Cybersecurity |
|
|
|
6 |
6,740 |
Shell Programming and Scripting |
|
|
|
7 |
6,763 |
Cybersecurity |
|
|
|
2 |
2,072 |
UNIX for Beginners Questions & Answers |
|
|
|
16 |
5,283 |
What is on Your Mind? |
|
|
|
5 |
6,860 |
UNIX for Advanced & Expert Users |
|
|
|
4 |
2,681 |
Shell Programming and Scripting |
|
|
|
4 |
4,099 |
Shell Programming and Scripting |
|
|
|
2 |
1,617 |
IP Networking |
|
|
|
10 |
7,216 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
10,509 |
IP Networking |
|
|
|
0 |
2,736 |
UNIX for Advanced & Expert Users |
|
|
|
29 |
20,209 |
Solaris |
|
|
|
2 |
3,472 |
Shell Programming and Scripting |
|
|
|
6 |
24,700 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
15,220 |
UNIX for Advanced & Expert Users |
|
|
|
1 |
7,165 |
Solaris |
|
|
|
1 |
10,594 |
Shell Programming and Scripting |
|
|
|
0 |
4,310 |
UNIX and Linux Applications |
|
|
|
3 |
9,872 |
Shell Programming and Scripting |
|
|
|
2 |
4,525 |
Linux |
|
|
|
4 |
3,328 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
9,557 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
5,953 |
Linux |
|
|
|
3 |
21,643 |
IP Networking |
|
|
|
6 |
50,379 |
Solaris |
|
|
|
2 |
4,143 |
UNIX for Dummies Questions & Answers |
|
|
|
7 |
21,594 |
OS X (Apple) |
|
|
|
5 |
5,402 |
UNIX for Dummies Questions & Answers |
|
|
|
6 |
10,462 |
AIX |
|
|
|
9 |
19,862 |
UNIX for Dummies Questions & Answers |
|
|
|
15 |
39,180 |
IP Networking |
|
|
|
2 |
2,264 |
Shell Programming and Scripting |
|
|
|
4 |
11,299 |
UNIX and Linux Applications |
|
|
|
2 |
13,928 |
Shell Programming and Scripting |
|
|
|
3 |
3,786 |
Shell Programming and Scripting |
|
|
|
7 |
9,750 |
Solaris |
|
|
|
9 |
6,620 |
Solaris |
|
|
|
3 |
5,808 |
Shell Programming and Scripting |
|
|
|
2 |
6,247 |
IP Networking |
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)