Linux kernel boot configuration

Question

I am working on SH architecture, I found

CONFIG_ZERO_PAGE_OFFSET=0x800000 
CONFIG_ENTRY_OFFSET=0x00001000

in my kernel configuration. Can any one tell me, what is significance of these offsets? How are they used by kernel?

Thanks in advance.

Answer 1

CONFIG_ZERO_PAGE_OFFSET - the default offset of zero page ( The zero page is a single page of physical memory filled with zeroes, maintained by the operating system. - from here )
CONFIG_ENTRY_OFFSET - offset of start entry in kernel
You can see usage of those variables in kernel makefile