Achilleas Anagnostopoulos 32a10601ac Add support for copy-on-write to the page fault handler ...

Page faults occurring on RO pages with the CopyOnWrite flag set will be
handled by the page handler as follows:
- allocate new frame
- establish temporary mapping for new frame
- copy original page to new frame
- update entry for the page where the fault occurred:
  - set physical frame address to the allocated frame
  - clear CoW flag and set Present, RW flags
- return from the fault handler to resume execution at the instruction
  that caused the fault

Any other page faults will still cause a kernel panic

2017-06-22 07:44:55 +01:00

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