Messages in this thread |  | | | Subject | swsusp vs pgdir | | From | Benjamin Herrenschmidt <> | | Date | Fri, 23 Jan 2004 15:58:41 +1100 |
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Hi !
I've been bored enough today to hack on getting the current pmdisk/swsusp up on ppc. The required arch code should be almost identical.
However, when looking at it, I didn't fully understand how you actually ensure your page mappings aren't beeing blown away behind your back during the copy operation on resume, but since my knowledge of x86 is almost inexistant, I didn't decipher this from the source code. Could you explain a bit ?
The thing is that you seem to point to the swapper pgdir during the copy, that is the kernel page tables, but those are beeing wiped out during the copy potentially, no ?
For PPC, I'm using a simple approach at first by disabling the data translation on the MMU and using a BAT to keep the .text mapped, though ultimately, if I want to support POWER4, I'll have to allocate a temporary hash table in some place that doesn't get overriden... That means a hook at a higher level in the resume code path.
Thanks for the details, Ben.
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