Chapter 2. The
proc
File System
29
2.2.10.
/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 tells the kind of memory located within those registers. In particular, this column
will tell you which memory registers are used by the kernel within the system RAM or, if you have
multiple Ethernet ports on your NIC, the memory registers assigned for each port.
2.2.11.
/proc/ioports
The output of
/proc/ioports
provides a list of currently registered port regions used for input or
output communication with a device. This file can be quite long, with a beginning similar to this:
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
00f0 00ff : fpu
0170 0177 : ide1
01f0 01f7 : ide0
02f8 02ff : serial(auto)
0376 0376 : ide1
03c0 03df : vga+
03f6 03f6 : ide0
03f8 03ff : serial(auto)
0cf8 0cff : PCI conf1
d000 dfff : PCI Bus #01
e000 e00f : VIA Technologies, Inc. Bus Master IDE
e000 e007 : ide0
e008 e00f : ide1
e800 e87f : Digital Equipment Corporation DECchip 21140 [FasterNet]
e800 e87f : tulip
The first column gives the IO port address range reserved for the device listed in the second column.






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