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- ; 32BIT DOS EXTENDER
- ;
- ; Written by Adam Seychell Wed 8-25-1993
- ;
-
- .386
-
- DATA32 SEGMENT PUBLIC 'data' use32
- CODE32_sel dw 50h ; Selector Values
- CODE16_sel dw 58h
- DATA_sel dw 60h
- TheSTACK_sel dw 30h
- VIDEO_sel dw 28h
- FLAT_CODE32_sel dw 10h
- FLAT_DATA_sel dw 08h
- XMS_sel dw 18h
- BASE_sel dw 20h
- PSP_sel dw 48h
-
- xms_usage dd 0 ; Requested size of XMS block in bytes.
- xms_base dd ? ; Linear base address of the XMS block.
- Base_Segment dw ? ; Real mode segment value for base memory.
- PSP_segment dw ? ; Real mode segment value for PSP segment.
-
- align 4
- v86_mesg db ' Message printed in v86 mode ',10,13,36
-
- DATA32 ENDS
-
- CODE32 SEGMENT PUBLIC 'CODE' USE32
- assume DS:DATA32 , CS:CODE32
-
- include dos32.inc
- start32: ; 32 bit code entry point. DS -> data descripor
-
- mov es,[xms_sel] ;Must load these with valid selectors
- mov fs,[FLAT_DATA_sel]
- mov gs,[video_sel]
- sti
-
- ; Example to call a real mode interrupt
-
- mov SS:real_DS,DATA32 ; Set the DS reg for V86 mode
- mov edx,offset v86_mesg
- mov ah,9
- dosint 21h
-
-
- mov ah,4ch ; Termiate the program
- int 21h
-
-
- ; The 16 hardware inetrrupts.
- ; If an IRQ accours in V86 mode the segment registers will contain same
- ; selector values as they were before the last V86 call. ( i.e dosint xx ).
- IRQ0: dosint 08h ; 8253 Timer 0
- iretd
- IRQ1: dosint 09h ; 8242 Keyboard
- iretd
- IRQ2: dosint 0Ah ; LPT 2 or Vert Retrate (6845)
- iretd
- IRQ3: dosint 0Bh ; Serial communications ports 2 & 4
- iretd
- IRQ4: dosint 0Ch ; Serial communications ports 1 & 3
- iretd
- IRQ5: dosint 0Dh ; Reserved
- iretd
- IRQ6: dosint 0Eh ; NEC ÊPD765 Floppy Disk Controler
- iretd
- IRQ7: dosint 0Fh ; LPT 1
- iretd
- IRQ8: dosint 70h ; 6818 CMOS CLOCK
- iretd
- IRQ9: dosint 71h ; Reserved
- iretd
- IRQ10: dosint 72h ; Reserved
- iretd
- IRQ11: dosint 73h ; Reserved
- iretd
- IRQ12: dosint 74h ; Reserved
- iretd
- IRQ13: dosint 75h ; 80x87 Math Co-Pro exception.
- iretd
- IRQ14: dosint 76h ; Hard Drive Cotroller.
- iretd
- IRQ15: dosint 77h ; Reserved
- iretd
-
-
- CODE32 ENDS
-
- END