System and method for erasing and writing desktop management interface data under a linux system

A system for erasing and writing desktop management interface (DMI) data under a Linux system in a computer, the computer having a processor and a basic input output system (BIOS), the BIOS comprising a management information format database (MIFD) which stores the DMI data, the system comprising:

• a process creating module operable to create a new process, the creation by creating a blank process control block (PCB), allocating memory space for the process, initializing the PCB using parameters, and putting the process on a ready queue;
• a virtual memory environment constructing module operable to map interrupt vectors and data of the BIOS into a designated memory space of the process to construct a virtual memory environment for running of a virtual 8086 mode;
• a stack space constructing module operable to select a subspace from the designated memory space as a stack space;
• an enter point searching module operable to probe a PnP signature from physical addresses of the BIOS, and get enter point data which is after the PnP signature for searching an enter point to a PnP calling routine;
• a permission setting module operable to set a permission for inputting/outputting operations of the PnP calling routine;
• a parameters storing module operable to receive erasing/writing parameters, and push the erasing/writing parameters into the stack space;
• a runtime environment constructing module operable to construct a runtime environment for the virtual 8086 mode;
• a signal block setting module operable to set a signal block to prevent signals from breaking jump to the virtual 8086 mode;
• and
• a calling module operable to set a virtual 8086 mode flag in a flag register of the processor so as to cause the process to jump to the virtual 8086 mode, and execute the PnP calling routine to read, erase, and write/or DMI data from/to the MIFD according to the erasing/writing parameters.

A storage medium having stored thereon instructions that, when executed by a processor, causing the processor to perform a method for erasing and writing desktop management interface (DMI) data under a Linux system, wherein the method comprises:

• creating a new process, the creation is made by creating a blank process control block (PCB), allocating memory space for the process, initializing the PCB using parameters, and putting the process on a ready queue;
• constructing a virtual memory environment for running of a virtual 8086 mode, the construction according to mapping interrupt vectors and data of the BIOS into a designated memory space of the process;
• constructing a stack space of the virtual 8086 mode by selecting a subspace from the designated memory space;
• searching an enter point to a PnP calling routine by probing a PnP signature from physical addresses of the BIOS and getting enter point data which is after the PnP signature;
• setting a permission for inputting/outputting operations of the PnP calling routine;
• receiving erasing/writing parameters;
• pushing the erasing/writing parameters into the stack space;
• constructing a runtime environment for the virtual 8086 mode;
• setting a signal block to prevent signals from breaking jump to the virtual 8086 mode;
• setting a virtual 8086 mode flag in a flag register of the processor so as to cause the process to jump to the virtual 8086 mode;
• executing the PnP calling routine to read, erase, and/or write the DMI data from/to the MIFD according to the erasing/writing parameters;
• and
• outputting a result of whether the PnP calling routine has been executed successfully by determining whether a value in an AX register of the processor is zero.