Multi-core shared page miss handler
Methods and apparatus are disclosed for using a shared page miss handler device to satisfy page miss requests of a plurality of devices in a multi-core system. One embodiment of such a method comprises receiving one or more page miss requests from one or more respective requesting devices of the plurality of devices in the multi-core system, and arbitrating to identify a first page miss requests of the one or more requesting devices A page table walk is performed to generate a physical address responsive to the first page miss request. Then the physical address is sent to the corresponding requesting device, or a fault is signaled to an operating system for the corresponding requesting device responsive to the first page miss request.
1. A system on a chip comprising:
a plurality of requesting devices including a plurality of processor cores;
a page miss request queue in a single, shared page miss handler (PMH) to receive at least two page miss requests for at least two respective misses in a translation lookaside buffer (TLB) of at least two of the plurality of requesting devices;
arbitration logic to identify a first page miss request of the plurality of page miss requests to process;
the single, shared PMH to perform a page table walk to generate one of a physical address and a page fault responsive to the first page miss request;
the single, shared PMH to eliminate a duplicate page walk and a duplicate page fault resulting from page table walks among the plurality of page miss requests; and
communication logic to, when the page table walk does not result in a page fault, send the physical address to an operating system for a corresponding requesting device, and, otherwise, when the page table walk does result in a page fault, send a signal fault to the operating system for the corresponding requesting device responsive to the first page miss request.
2. The system on the chip of claim 1 , further comprising a TLB coupled with the PMH to store the physical address after the page table walk.
3. The system on the chip of claim 1 , wherein the plurality of requesting devices further comprises a graphics processor.
4. The system on the chip of claim 1 , wherein the plurality of requesting devices further comprises a transport processor.
5. The system on the chip of claim 1 , wherein the plurality of requesting devices further comprises a security processor.
6. The system on the chip of claim 1 , wherein the plurality of requesting devices further comprises a video device.
7. The system on the chip of claim 1 , further comprising a connectivity device coupled to the plurality of processor cores.
8. The system on the chip of claim 1 , further comprising a serial bus coupled to the plurality of processor cores.
9. The system on the chip of claim 1 , further comprising a modem device coupled to the plurality of processor cores.
10. The system on the chip of claim 1 , further comprising a memory controller coupled to the single, shared page miss handler.