Method of resetting sequence of access to extended memory disrup

Details Method of resetting sequence of access to extended memory disrup Method of resetting sequence of access to extended memory disrup

1988-11-07

1992-06-23

Lee, Thomas C.

Boots, shoes, and leggings

3642517, 3642555, 3642629, 3642416, 3649417, 3649551, 3649607, 364DIG1, G06F 932, G06F 944, G06F 1206

Patent

active

051250870

ABSTRACT:
A method and system for allowing an interrupted computer program to detect the occurrence of an interrupt. In a preferred embodiment, a system according to the present invention allows an Intel 80286-compatible based computer program executing in real mode to detect the occurrence of an interrupt during the execution of a set of instructions. According to a preferred method of the present invention, the LOADALL instruction is used to load the code segment selector with the segment address of the code in the interrupted routine to be executed upon return from an interrupt and to load the code segment base address with the segment base address of the set of instruction during whose execution interrupt is to be detected. A preferred method then executes the set of instructions. Upon occurrence of an interrrupt, the preferred method saves the value in the code segment selector and executes an interrupt routine. Upon return from the interrupt routine, a preferred method loads the code segment base address based on the saved code segment value so that the interrupted routine resumes execution at an instruction other than the interrupted instruction. The methods of the present invention allow a program executing in real mode to access data in extended memory with interrupts enabled.

REFERENCES:
patent: 4498136 (1985-02-01), Sproul, III
patent: 4546431 (1985-10-01), Horvath
patent: 4551798 (1985-11-01), Horvath
patent: 4586127 (1986-04-01), Horvath
patent: 4779187 (1988-10-01), Letwin
patent: 4807185 (1989-02-01), Kamiya
patent: 4890221 (1989-12-01), Gage
"Secret 286 LOADALL Instruction Allows Access to Extended Memory In Read Mode," Microprocessor Report, vol. 1, No. 2, Oct. 1987.

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