Software management systems and methods for automotive computing devices
First Claim
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1. In an automotive computing device, a method comprising:
- maintaining a translation look-aside buffer that contains entries for recently translated virtual page addresses;
maintaining a page table in device memory that contains a map for every valid virtual page address; and
maintaining an object store page table in device SRAM that contains information associated with locations for every object store page.
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Abstract
Methods and systems for operating automotive computing devices are described. In one embodiment, a small amount of static RAM (SRAM) is incorporated into an automotive computing device and is battery-backed to provide a non-volatile memory space in which critical data, e.g. the object store, can be maintained in the event of a power loss. Circuitry is provided to ensure that the SRAM receives back up power from the battery at appropriate times. Software manages the SRAM and the other storage assembly components and makes use of virtual paging or virtual addressing techniques to keep track of where various pages, including object store pages, are stored in the system.
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Citations
25 Claims
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1. In an automotive computing device, a method comprising:
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maintaining a translation look-aside buffer that contains entries for recently translated virtual page addresses;
maintaining a page table in device memory that contains a map for every valid virtual page address; and
maintaining an object store page table in device SRAM that contains information associated with locations for every object store page. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A programmable automotive computing device programmed with instructions which, when executed by the computing device, cause the computing device to:
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maintain a translation look-aside buffer that contains entries for recently translated virtual page addresses;
maintain a page table in device memory that contains a map for every valid virtual page address;
maintain an object store page table in device SRAM that contains information associated with locations for every object store page;
update the object store page table in the SRAM responsive to paging an object store page within the device;
flush pages from SRAM to another medium in a predetermined manner to make room for additional pages in the SRAM; and
battery-back the SRAM in an event of a power failure. - View Dependent Claims (11)
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12. A programmable automotive computing device programmed with instructions which, when executed by the computing device, cause the computing device to:
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maintain a translation look-aside buffer that contains entries for recently translated virtual page addresses;
maintain a page table in device memory that contains a map for every valid virtual page address;
maintain an object store page table in a dedicated DRAM buffer, the object store page table containing information associated with locations for every object store page;
update the object store page table in the DRAM buffer responsive to paging an object store page within the device;
flush pages from the DRAM buffer to another medium in a predetermined manner to make room for additional pages in the DRAM buffer; and
copy an amount of data contained in the DRAM buffer to flash memory in the event of a power failure.
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13. An automotive computing system comprising:
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a central processing unit having a translation look-aside buffer that contains entries for recently translated virtual page addresses;
physical memory operably associated with the central processing unit and containing a page table that contains a map for every valid virtual page address; and
SRAM containing an object store page table that contains information associated with locations for every object store page in the event of a power failure.
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14. In an automotive computing device, a method comprising:
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maintaining multiple object store pages in device SRAM;
determining when to flush pages as a function of how many free SRAM pages are available;
periodically flushing one or more object store pages to device non-volatile memory to make room for additional object store pages; and
assigning multiple threads with different priorities to flush pages in accordance with their priorities. - View Dependent Claims (15, 16, 17, 18)
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19. In an automotive computing device, a method comprising:
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providing device SRAM that is configured to be backed by a battery in an event of a power loss;
maintaining a translation look-aside buffer that contains entries for recently translated virtual page addresses;
maintaining a page table in device memory that contains a map for every valid virtual page address;
maintaining an object store page table in the device SRAM that contains information associated with locations for every object store page;
updating the object store page table in the SRAM responsive to paging an object store page within the device; and
battery-backing the SRAM in an event of a power loss. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification