[Xen-devel] real-mode switch

["Jayant Mangalampalli" <Jayant_Mangalampalli@xxxxxxxxxxx>]

I am trying to switch to real-mode to make some BIOS calls. However, when I try to remap kernel at virtual address 0 I get “Unable to handle kernel paging request at virtual address c06e0000” error. Here is where I get it:

memcpy(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS, sizeof(swapper_pg_dir[0]) * KERNEL_PGD_PTRS);

swapper_pg_dir is 0xc06e0000, and user PGD pointers start at 0x400 and kernel pointers start at 0x100. Any idea why I get this?

Thanks,

Jayant Mangalampalli

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