Thanks all for the help.
I've tried before to replace the MAP_PRIVATE to MAP_SHARED, but then the memory is mapped to 0xffffffff, and accessing the memory address later fails with segmentation fault (since when I add 0x24, it yields a pointer to 0x00000023)
Using the nopage operation, go me to no better results.
Ilan on 01/30/05 16:50 Gilad Ben-Yossef said the following:
Ilan Finci wrote:
Calling mmap from the user application returns an address, but trying to access this address, yields an error message:
do_wp_page: bogus page at address 30027024 (page 0xc23358e0) VM: killing process testSram
(0x30027000 is the address that mmap returned, and I tried to access 24 bytes after this. I've mapped 0x40000 bytes, so there shouldn't be a problem).
In the flags to the mmap call replace MAP_PRIVATE (or 0) with MAP_SHARED. The kernel is trying to do copy on write for your pages (hence the name of function in the error message - do_ write protect _page) and that's not going to work with what you are trying to do.
You owe the wizard a pogo stick :-)
Gilad
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