x86 memory detection

[sudheer.divakaran at wipro.com]

I think the call chain is like this

main() (arch/x86/boot/main.c) calls detect_memory() (arch/x86/boot/memory.c) which calls detect_memory_xxxxx() functions, they invoke bios interrupts to determine the amount of RAM & fill the boot_params structure.


Sudheer



-----Original Message-----
From: kernelnewbies-bounces at kernelnewbies.org on behalf of Arun S
Sent: Thu 2/3/2011 10:18 AM
To: kernelnewbies at kernelnewbies.org
Subject: x86 memory detection
 
Hi,
 How does the kernel detects the amount of available System RAM in the
system under x86 architecture?.

Under 2.6.x kernels,


1. Does it use BIOS interrupt 15 for determining the RAM

 OR

2. Does the boot loader fills the e820_map as explained
inDocumentation/x86/boot.txt &   Documentation/x86/zero-page.txt  and the
kernel uses in information

OR

3. Is there any other mechanism (if so, in which file under kernel tree I
can find this detection code)



Thanks,
Arun


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