Resume processing function for the OS/2 operating system

Claim 2

In a computer system having a central processing unit (CPU) capable of operating in a protected mode and a real mode in conjunction with an operating system, a resume processing method of saving and subsequently restoring system data indicative of the CPU's operating conditions in response to a power-off signal and a subsequent power-on signal, said resume processing method comprising the steps of: (a) saving a first set of protected mode data associated with the operating system indicative of operating conditions responsive to said power-off signal, (b) saving a second set of data associated with said CPU, but not associated with said operating system, indicative of said CPU's operating conditions in response to said power-off signal, (c) restoring said second set of data saved in step (b) responsive to a power-on signal, and (d) restoring said first set of data saved in step (c) responsive to said power-on signal.

Claim 3

The resume processing method according to claim 1, wherein step (a) comprises the steps of: (i) disabling interrupts associated with said CPU, (ii) saving registers, including a flag register, associated with said CPU, (iii) saving a programmable interrupt controller (PIC) mask associated with said CPU, and (iv) disabling said PIC.

Claim 4

The resume processing method according to claim 2, wherein step (a) further comprises the steps of: (v) saving said flag register onto a stack associated with said CPU, and (vi) saving a return address associated with said CPU onto said stack.

Claim 5

The resume processing method according to claim 3, wherein step (v) further comprises the initial step of: clearing a direction flag associated with said flag register.

Claim 6

The resume processing method according to claim 3, wherein step (a) further comprises the step of, (vii) resetting a floppy drive associated with said CPU.

Claim 7

The resume processing method according to claim 2, wherein step (a) further comprises the steps of: (v) saving a stack selector and pointer associated with said CPU, (vi) setting said stack pointer to point to a local stack area, (vii) saving said flag register on a stack associated with said CPU, and (viii) saving a return address associated with said CPU onto said stack.

Claim 8

The resume processing method according to claim 6, wherein said saving step (v) saves its respective data into a memory location associated with said CPU.

Claim 9

The resume processing method according to claim 6, wherein steps (i)-(vi) are performed when said CPU is in said protected mode.

Claim 10

The resume processing method according to claim 6, wherein step (viii) further comprises the step of clearing a direction flag associated with said flag register.

Claim 11

The resume processing method according to claim 6, wherein step (a) further comprises the step of: (x) resetting a floppy drive associated with said CPU.

Claim 12

The resume processing method according to claim 2: wherein said saving steps (ii)-(iii) save their respective data onto a stack associated with said CPU.

Claim 13

The resume processing method according to claim 1, wherein step (d) comprises the steps of: (i) disabling interrupts associated with said CPU, (ii) enabling a programmable interrupt controller (PIC) associated with said CPU, (iii) restoring a previously saved PIC mask associated with said CPU, (iv) configuring a real time clock associated with said CPU, (v) enabling an A20 address line associated with said CPU, and (vi) resetting a floppy drive associated with said CPU.

Claim 14

The resume processing method according to claim 12, wherein step (d) further comprises the steps of: (vii) resetting a parallel port associated with said CPU, and (viii) restoring previously saved registers, including a flag register, associated with said CPU.

Claim 15

The resume processing method according to claim 13: wherein said restoring step (viii) restores the respective data from a stack associated with said CPU.

Claim 16

The resume processing method according to claim 12, wherein step (d) further comprises the steps of: (vii) restoring a previously saved interrupt descriptor table (IDT) register value associated with said CPU, (viii) restoring a previously saved global descriptor table (GDT) register value associated with said CPU, (ix) setting a code segment register with a selector which references a driver capable of performing steps (a) and (d), (x) setting a code segment register with a selector which references said driver, (xi) setting a protected mode enable bit in a machine status word (MSW) associated with said CPU, (xii) restoring a previously saved stack selector and pointer associated with said CPU, (xiii) resetting a parallel port associated with said CPU, (xiv) restoring previously saved registers, including a flag register, associated with said CPU.

Claim 17

The resume processing method according to claim 15: wherein said restoring steps (vii)-(viii), (xii), and (xiv) restore their respective data from a stack associated with said CPU.

Claim 18

The resume processing method according to claim 12: wherein said restoring step (iii) restores the respective data from a stack associated with said CPU.

Claim 19

The resume processing method according to claim 1, further comprising the steps, prior to step (a), of: (i) loading a resume processing driver to perform steps (a)-(d), and (ii) hooking a vector associated with a non-maskable interrupt (NMI) to perform steps (a)-(d) responsive to said NMI.

Claim 20

The resume processing method according to claim 18, wherein step (ii) comprises the steps of: (A) hooking a real mode vector associated with an NMI to perform steps (a)-(d) responsive to said NMI occurring on said CPU when said CPU is operating in said real mode, and (B) hooking a protected mode vector associated with an NMI to perform steps (a)-(d) responsive to said NMI occurring on said CPU when said CPU is operating in said protected mode.

Claim 21

The resume processing method according to claim 1, wherein steps (a) and (d) are performed by an OS/2 device driver.

Claim 22

The resume processing method according to claim 1, wherein steps (a) and (d) are performed by an OS/2 base driver.

Claim 23

The resume processing method according to claim 1, wherein steps (a) and (d) are performed by an OS/2 OEMHLP driver.

Claim 24

The resume processing method according to claim 1, wherein steps (a)-(b) are performed responsive to a non-maskable interrupt (NMI) occurring on said CPU.

Claim 25

The resume processing method according to claim 1, wherein steps (b)-(c) are performed by a Resume BIOS routine.

Claim 26

In a computer system having a central processing unit (CPU) capable of operating in a protected mode and a real mode and operating under the OS/2 operating system, a resume processing method of saving and subsequently restoring system data indicative of the CPU's operating conditions in response to a power-off signal and a subsequent power-on signal, said resume processing method comprising the steps of: (a) initializing a resume processing driver to perform the following steps, (b) saving a first set of data associated with said OS/2 operating system indicative of OS/2's operating conditions responsive to said power-off signal, (c) saving a second set of data associated with said CPU, but not associated with said OS/2 operating system, indicative of said CPU's operating conditions in response to said power-off signal, (d) restoring said second set of data saved in step (c) responsive to a power-on signal, and (e) restoring said first set of data saved in step (b) responsive to a power-on signal, wherein step (b) comprises the steps of: (i) disabling interrupts associated with said CPU, (ii) saving registers, including a flag register, associated with said CPU, (iii) saving a programmable interrupt controller (PIC) mask associated with said CPU, (iv) disabling said PIC (v) saving said flag register on said stack, and (vi) saving a return address associated with said CPU onto a stack associated with said CPU, and (vii) resetting a floppy drive associated with said CPU if said floppy drive was active when said power-off signal was received.

Claim 27

In a computer system having a central processing unit (CPU) capable of operating in a protected mode and a real mode and operating under the OS/2 operating system, a resume processing method of saving and subsequently restoring system data indicative of the CPU's operating conditions in response to a power-off signal and a subsequent power-on signal, said resume processing method comprising the steps of: (a) initializing a resume processing driver to perform the following steps, (b) saving a first set of data associated with said OS/2 operating system indicative of OS/2's operating conditions responsive to said power-off signal, (c) saving a second set of data associated with said CPU, but not associated with said OS/2 operating system, indicative of said CPU's operating conditions in response to said power-off signal, (d) restoring said second set of data saved in step (c) responsive to a power-on signal, and (e) restoring said first set of data saved in step (b) responsive to a power-on signal, wherein step (b) comprises the steps of: (i) disabling interrupts associated with said CPU, (ii) saving registers, including a flag register, associated with said CPU, (iii) saving a programmable interrupt controller (PIC) mask associated with said CPU, (iv) disabling said PIC (v) saving said flag register on said stack, and (vi) saving a return address associated with said CPU onto a stack associated with said CPU, and (vii) resetting a floppy drive associated with said CPU if said floppy drive was active when said power-off signal was received.

Claim 34

The apparatus of claim 28, wherein said protected mode saving means saves a mask of a programmable interrupt controller associated with the computer system.

Claim 35

The apparatus of claim 29, wherein said programmable interrupt controller is disabled.

Claim 36

The apparatus of claim 28, wherein said protected mode saving means is an OS/2 device driver.

Claim 37

The apparatus of claim 28, wherein said protected mode saving means utilizes a non-maskable interrupt.

Claim 38

The apparatus of claim 28, wherein said protected mode saving means resets a floppy drive.

Claim 39

The apparatus according to claim 28, wherein said protected mode saving means further comprises: stack saving means for saving a stack selector and pointer associated with the computer system, flag saving means for saving a flag register on a stack associated with the computer system, and return address saving means for saving a return address associated with the computer system onto said stack.

Claim 42

The apparatus of claim 35, wherein said protected mode restoring means is an OS/2 device driver.

Claim 43

The apparatus of claim 35, wherein said protected mode storing means restores a previously saved programmable interrupt controller mask.

Claim 44

The apparatus of claim 35, wherein said protected mode storing means configures a real time clock associated with the computer system.

Claim 45

The apparatus of claim 35, wherein said protected mode storing means enables an A20 address lines associated with the computer system.

Claim 46

The apparatus of claim 35, wherein said protected mode storing means resets a floppy drive associated with the computer system.

Claim 47

The apparatus of claim 35, wherein said protected mode storing means comprises means for: restoring a previously saved interrupt descriptor table register value associated with the computer system, restoring a previously saved global descriptor table register value associated with the computer system, setting a code segment register with a selector which references a driver, setting a code segment register with a selector which references said driver, setting a protected mode enable bit in a machine status word associated with the computer system, restoring a previously saved stack selector and pointer associated with the computer system, resetting a parallel port associated with the computer system, restoring previously saved registers, including a flag register, associated with the computer system.

Claim 50

The apparatus of claim 42, wherein said protected mode saving means saves a mask of a programmable interrupt controller associated with the computer system.

Claim 51

The apparatus of claim 43, wherein said programmable interrupt controller is disabled.

Claim 52

The apparatus of claim 42, wherein said protected mode saving means is an OS/2 device driver.

Claim 53

The apparatus of claim 42, wherein said protected mode saving means utilizes a non-maskable interrupt.

Claim 54

The apparatus of claim 42, wherein said protected mode saving means resets a floppy drive.

Claim 55

The apparatus according to claim 42, wherein said protected mode saving means further comprises: stack saving means for saving a stack selector and pointer associated with the computer system, flag saving means for saving a flag register on a stack associated with the computer system, and return address saving means for saving a return address associated with the computer system onto said stack.

Claim 58

The apparatus of claim 49, wherein said protected mode restoring means is an OS/2 device driver.

Claim 59

The apparatus of claim 49, wherein said protected mode storing means restores a previously saved programmable interrupt controller mask.

Claim 60

The apparatus of claim 49, wherein said protected mode storing means configures a real time clock associated with the computer system.

Claim 61

The apparatus of claim 49, wherein said protected mode storing means enables an A20 address line associated with the computer system.

Claim 62

The apparatus of claim 49, wherein said protected mode storing means resets a floppy drive associated with the computer system.

Claim 63

The apparatus of claim 49, wherein said protected mode storing means comprises means for: restoring a previously saved interrupt descriptor table register value associated with the computer system, restoring a previously saved global descriptor table register value associated with the computer system, setting a code segment register with a selector which references a driver, setting a code segment register with a selector which references said driver, setting a protected mode enable bit in a machine status word associated with the computer system, restoring a previously saved stack selector and pointer associated with the computer system, resetting a parallel port associated with the computer system, restoring previously saved registers, including a flag register, associated with the computer system.