Unused memory area

yousafsajjad · 06-18-2010, 02:58 PM

I not sure where but i have found out there is some small space in the ram close to Interrupt vector table (IVT) that a user application could use ... In fact it is for the BIOS to use ... so does anyone know what is the address range for it ..

tkmsr · 06-19-2010, 02:38 AM

Quote:

Originally Posted by yousafsajjad

I not sure where but i have found out there is some small space in the ram close to Interrupt vector table (IVT) that a user application could use ... In fact it is for the BIOS to use ... so does anyone know what is the address range for it ..

Can you share what have you found exactly ?

yousafsajjad · 06-21-2010, 12:36 PM

I am referring to Extended BIOS Data Area (EBDA- http://wiki.osdev.org/Memory_Map_%28...rea_.28EBDA.29)

yousafsajjad · 06-21-2010, 02:38 PM

I am thinking about extending ebda and use that extended memory space for mapping virtual memory to ram using mmap

yousafsajjad · 06-28-2010, 02:42 PM

I have found out that from a user application you can read and write in the memory from 0x00010000 till 0x0009FFFF .. that will solve my contiguous physical memory problem but i would have to do the memory management myself