Red Hat ENTERPRISE LINUX 3 Reference Manual page 69

proc
Chapter 5. The
The first column refers to the IRQ number. Each CPU in the system has its own column and its own
number of interrupts per IRQ. The next column reports the type of interrupt, and the last column
contains the name of the device that is located at that IRQ.
Each of the types of interrupts seen in this file, which are architecture-specific, mean something dif-
ferent. For x86 machines, the following values are common:
— This is the old AT computer interrupts.
• XT-PIC
— The voltage signal on this interrupt transitions from low to high, creating an
• IO-APIC-edge
edge, where the interrupt occurs and is only signaled once. This kind of interrupt, as well as the
IO-APIC-level
higher.
• IO-APIC-level
again.
5.2.10.
/proc/iomem
This file shows you the current map of the system's memory for each physical device:
00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-07ffffff : System RAM
00100000-00291ba8 : Kernel code
00291ba9-002e09cb : Kernel data
e0000000-e3ffffff : VIA Technologies, Inc. VT82C597 [Apollo VP3]
e4000000-e7ffffff : PCI Bus #01
e4000000-e4003fff : Matrox Graphics, Inc. MGA G200 AGP
e5000000-e57fffff : Matrox Graphics, Inc. MGA G200 AGP
e8000000-e8ffffff : PCI Bus #01
e8000000-e8ffffff : Matrox Graphics, Inc. MGA G200 AGP
ea000000-ea00007f : Digital Equipment Corporation DECchip 21140 [FasterNet]
ea000000-ea00007f : tulip
ffff0000-ffffffff : reserved
The first column displays the memory registers used by each of the different types of memory. The
second column lists the kind of memory located within those registers and displays which memory
registers are used by the kernel within the system RAM or, if the network interface card has multiple
Ethernet ports, the memory registers assigned for each port.
5.2.11.
/proc/ioports
The output of
/proc/ioports
output communication with a device. This file can be quite long. The following is a partial listing:
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0070-007f : rtc
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
File System
interrupt, are only seen on systems with processors from the 586 family and
— Generates interrupts when its voltage signal is high until the signal is low
provides a list of currently registered port regions used for input or
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