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    SubjectRe: Kernel virtual memory?
    Date
    Hi,

    > Could kernel use virtual memory hardware to make non-linear chunks of
    > memory to look linear? It seems to me that it could solve the problems
    > with memory fragmentation and DMA memory allocation.

    The memory management is done in the CPU, so only the CPU sees
    this virtual address. PCI-BUS- and ISA-Address is on intel architecture
    the same address like the physical address.

    >
    > DMA memory could be allocated by moving allocated blocks away from the
    > lower 16MB, and other parts of kernel could be made happy by changing the
    > page tables accordingly.
    >
    > So, is this possible/feasible/too ugly to implement?
    Not possible.

    Jochen
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