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PAM registers in i5? (writing to C0000 space)

Hi all!
before i5 I was able to write to C0000 (video bios shadow) space by setting PAM registers to unlock and re-lock this address space. In documentation for new chipsets it says the following:
PAM (000C_0000h-000F_FFFFh)
The 13 sections from 768 KB to 1 MB comprise what is also known as the PAM Memory Area. Each section has Read enable and Write enable attributes. The CPU documentation will now contain the registers and decode rules/restrictions.
The PAM registers have moved to the CPU. For the PAM register details, refer to CPU documentation.
After a long search in system programming guides I am still unable to find a way to write to this memory range.
Any hint would be useful.
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