5/1/2023 0 Comments Compute method map![]() It can be seen that once the base virtual address for an NVRAM segment is extracted, the final virtual address may be obtained by adding the base virtual address to the offset in the NVRAM segment. This process specific table 500 would have all the NVRAM segments mapped into the processes running the user program 210 (shown in FIG. 5, the NVRAM segment number 320 is used to index the PROCNVRAMTBL. This table 500 may be referred to as process NVRAM table (PROCNVRAMTBL). 5, to maintain a mapping of the NVRAM segment numbers 320 to the base virtual address at which the segment is mapped for that process. In this case, operating system 295 is modified to create a per-process table 500, as shown in FIG. This mechanism ensures that NVRAM pointers are valid across reboots/power cycles and are valid across processes. 4) into virtual addresses for each process. In addition, the examples described below generate code to convert NVRAM pointers (as shown in FIG. ![]() The namespace directives are one of the NVRAM compiler directives. Furthermore, the examples described below relate to creation and storage of NVRAM addresses based on using NVRAM segment numbers and associated offset in the NVRAM segment and generating associated code by the compiler to map NVRAM segments calling into interfaces of an NVRAM driver in response to namespace directives and lookup of NVRAM pointers. More specifically, the examples described below relate to a scheme of including NVRAM compiler directives in a source code to signal a compiler that the program variables would point to locations in NVRAM and has to be treated as persistent pointers. The persistent pointers include an NVRAM segment identifier and an offset within an NVRAM segment. Various examples described below relate to generating NVRAM based persistent pointers to locations in an NVRAM using NVRAM compiler directives. This flexible but powerful construct may be used in implementing most of the basic data structures, such as trees, link lists and the like. Furthermore, pointers may be de-referenced to access data stored in an address location. Further, pointers are typically values of addresses in virtual address spaces, which can range from minimum to maximum virtual addresses. Pointers indicate address of data structures, objects and/or functions. Further, the embedded pointers are operating system process (for example, a running program on the system) dependent and may vary across operating system processes for the same memory location. To overcome this, the embedded pointers need to be made valid across reboots/power cycles. Pointers embedded in the data structure during operation may not be valid after power-up and/or reboot. In the following description and figures, some example implementations of systems and/or methods for implementing persistent pointers in a process running on non-volatile random access memory (NVRAM) and/or dynamic random-access memory (DRAM) based computing systems using NVRAM compiler directives are described. ![]() Furthermore, the method includes mapping information of each NVRAM segment formed by the program with an associated physical address in NVRAM by an NVRAM driver residing in the NVRAM or main memory, maintaining an NVRAM registry including the mapped information by the NVRAM driver, determining valid virtual addresses of processes during runtime using the generated assembly code including the persistent pointer enablers and the NVRAM registry including the mapped information, and generating the persistent pointers from the valid virtual addresses during runtime. The method further includes generating assembly code, including persistent pointer enablers, using the program including the modified variables by a compiler. The modified variables include NVRAM compiler directives indicative of persistent pointer type. In one example implementation, a method for generating persistent pointers using non-volatile random access memory (NVRAM) compiler directives in a program for NVRAM based computing systems includes generating a program including modified variables.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |