Vivek Goyal <[EMAIL PROTECTED]> writes: > I want to fill the virtual addresses of linearly mapped region. That is > physical addresses from 0 to MAXMEM (896 MB) are mapped by kernel at > virtual addresses PAGE_OFFSET to (PAGE_OFFSET + MAXMEM). Values of > PAGE_OFFSET and MAXMEM are already known and hard-coded.
PAGE_OFFSET has a common value of 0xc0000000, on x86. However that value is by no means fixed. The 4G/4G split changes it as do some other patches floating around at the time. On x86-64 I don't know how stable those kinds of offsets are. > I think I used the terminology kernel virtual address and that is adding > to the confusion. Kernel virtual addresses are not necessarily linearly > mapped. What I meant was kernel logical addresses whose associated > physical addresses differ only by a constant offset. I know what you meant. I simply meant that things don't look that constant to me. Especially in Linux where there are enough people to try most of the reasonable possibilities. I don't even think it is a bad idea. But I do think we have a different idea of what is constant. Eric - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
