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hey.. I wanted to know how we can get to know the last accessible ram address. Because in x86 Arch..in some RAM , there exist some memory holes, which are ...
  1. 07-31-2009 #1
    chandan_raka
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    kernel last physical memory

    hey..

    I wanted to know how we can get to know the last accessible ram address. Because in x86 Arch..in some RAM , there exist some memory holes, which are used by the BIOS, and kernel does not have the access to that.

    devmem_is_allowed() function could be used to check the valid ram access. I am still fiddling around with the codes for x86.

    The max_pfn does not points to the last physical address.
    If anybody finds it..please share it across.
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  2. 07-31-2009 #2
    chandan_raka
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    Hi,

    Eventually I got it myself. Just sharing so, it could help others too.

    Its the variable 'high_memory' contains the highest virtual memory. And if we convert it to physical by _pa(high_memory) we get the highest address given by BIOS in its memory map
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