Method and a computer system for allocating and mapping frame bu

Details Method and a computer system for allocating and mapping frame bu Method and a computer system for allocating and mapping frame bu

1994-05-16

1997-09-02

Moore, David K.

Electrical computers and digital processing systems: memory

Address formation

Address mapping

395326, 711203, 711206, 711207, 711163, 711209, G06F 926, G06F 932, G06F 1200, G06F 1202

Patent

active

056641397

ABSTRACT:
A video driver in a computer system is used to map a large video frame buffer into the logical address space above physical memory while the computer system is operating in WINDOWS STANDARD mode. The requirements of the necessary address space for the frame buffer (i.e., the size of the frame buffer), and the size of physical memory are determined. If there is sufficient address space above physical memory in which to map the frame buffer, the video driver attempts to map the frame buffer there in that address space. The desired physical and linear addresses for the frame buffer are determined. If the video driver detects that MICROSOFT WINDOWS is operating in standard mode, it searches memory to find the page directory that MICROSOFT WINDOWS created. Once the page directory is found, the driver creates a new page table to map the frame buffer into the desired linear address range and adds a new entry to the existing page directory to point to the new page table.

REFERENCES:
patent: 4817184 (1989-03-01), Thomason et al.
patent: 5119494 (1992-06-01), Garman
patent: 5245702 (1993-09-01), McIntyre et al.
patent: 5367658 (1994-11-01), Spear et al.
Kennedy, Randall. "QEMM 386 6.02", Windows Sources. v1 n7 p256 Aug. 1993.
Gookin, Dan. "QEMM-386 vs. 386Max". PC-Computing. v6 n4 p228 Apr. 1993.

Affiliated with

Also associated with

Rating

Method and a computer system for allocating and mapping frame bu does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and a computer system for allocating and mapping frame bu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and a computer system for allocating and mapping frame bu will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-316035