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# Interrupt instruction testbench

#

# At the end (3737ns in rtl-model, 275.9us in spartan3),

#  %ax=0x1234, %bx=0x0ed7

#

# int   1, 2 (int 3)

# into  3

# iret  4

#

.code16

start:

movw $0, %dx

movw %dx, %ds

movw $0x1000, %sp

movw %sp, %ss

movw $0xebe0, (52)

movw $0xe342, (54)

movw $0x0eff, %ax

push %ax

popf

int $13                 # (1)

jmp *%ax

.org 0x0cd7

pushf

pop %bx

movw $0xebe0, (12)

movw $0xe342, (14)

int $3                  # (2)

movw $0x3001, (16)

movw $0xf000, (18)

into                    # (3) branch taken

hlt

.org 0x2000

pushf

pop %ax

clc

iret                    # (4)

.org 0x3001

pop %cx

movw $0x4002, %cx

push %cx

iret

.org 0x4002

movw $0x4ff, %dx

push %dx

popf

movw $0x5000, (16)

into                    # (3) branch not taken

movw $0x1234, %ax

hlt

.org 0x5000

hlt

.org 65520

jmp start

.org 65535

.byte 0xff