376 datasheet(21/95 Pages) INTEL

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376 EMBEDDED PROCESSOR

This code should be linked into your application for boot loadable code The following build file illustrates how

this is accomplished

FLAT

build program id

SEGMENT

*segments (dpl

40)

Give all user segments a DPL of 0

phantom code

(dpl

40)

These two segments are created by

phantom data

(dpl

40)

the builder when the FLAT control is used

init code

(base

40ffffff80h)

Put startup code at the reset vector area

GATE

g13 (entry

413 dpl40 trap)

trap gate disables interrupts

i32 (entry

432 dpl40 interrupt)

interrupt gates doesn’t

TABLE

create GDT

GDT (LOCATION

4 GDT DESC

In a buffer starting at GDT DESC

BLD386 places the GDT base and

GDT limit values

Buffer must be

6 bytes long

The base and limit

values are places in this buffer

as two bytes of limit plus

four bytes of base in the format

required for use by the LGDT

instruction

ENTRY

4 (3 phantom code

Explicitly place segment

phantom data

entries into the GDT

5code32

6data

7init code)

)

TASK

MAIN TASK

(

DPL

4 0

Task privilege level is 0

DATA

4 DATA

Points to a segment that

indicates initial DS value

CODE

4 main

Entry point is main

which

must be a public id

STACKS

4 (DATA)

Segment id points to stack

segment

Sets the initial SSESP

NO INTENABLED

Disable interrupts

PRESENT

Present bit in TSS set to 1

)

MEMORY

(RANGE

4 (EPROM 4 ROM(0ffff8000h0ffffffffh)

DRAM

4 RAM(00ffffh))

ALLOCATE

4 (EPROM 4 (MAIN TASK)))

END

asm386 flatsima38 debug

asm386 applicationa38 debug

bnd386 applicationobjflatsimobj nolo debug oj (applicationbnd)

bld386 applicationbnd bf (flatsimbld) bl flat

Commands to assemble and build a boot-loadable application named ‘‘applicationa38’’ The initialization code

is called ‘‘flatsima38’’ and build file is called ‘‘applicationbld’’

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