Int 31/AX=0301h

DPMI 0.9+ - CALL REAL MODE PROCEDURE WITH FAR RETURN FRAME

AX = 0301h
BH = flags
bit 0:
Reset the interrupt controller and A20 line (DPMI 0.9)
reserved, must be 0 (DPMI 1.0+)
others:
Reserved must be 0.
CX = number of words to copy from protected mode to real mode stack.
ES:(E)DI = selector:offset of real mode call structure
(see #03148 at INT 31/AX=0300h)

Return:
CF clear if successful
real mode call structure modified (all fields except SS:SP, CS:IP
filled with return values from real mode interrupt)
CF set on error
AX = error code (DPMI 1.0+) (8012h,8013h,8014h,8021h)(see #03143)
protected mode stack unchanged

Notes: 16-bit programs use ES:DI as pointer, 32-bit programs use ES:EDI. The real mode procedure must exit with a FAR return. DPMI will provide a small (30 words) real mode stack if SS:SP is zero. The real mode handler must return with the stack in the same state as it was on being called

See Also: AX=0300h - AX=0302h - AX=FF02h - INT 21/AX=250E

See Also: INT 2C/AX=0025h

Category: DOS Extenders - Int 31h - D

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