Intel ARCHITECTURE IA-32 User Manual download pdf (Page 407)

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Vol. 3A 9-33

PROCESSOR MANAGEMENT AND INITIALIZATION

9.10.3 MAIN.ASM Source Code

The file MAIN.ASM shown in Example 9-2 defines the data and stack segments for this appli-

cation and can be substituted with the main module task written in a high-level language that is

invoked by the IRET instruction executed by STARTUP.ASM.

Example 9-2. MAIN.ASM

NAME main_module

data SEGMENT RW

dw 1000 dup(?)

DATA ENDS

stack stackseg 800

CODE SEGMENT ER use32 PUBLIC

main_start:

nop

CODE ENDS

END main_start, ds:data, ss:stack

9.10.4 Supporting Files

The batch file shown in Example 9-3 can be used to assemble the source code files

STARTUP.ASM and MAIN.ASM and build the final application.

Example 9-3. Batch File to Assemble and Build the Application

ASM386 STARTUP.ASM

ASM386 MAIN.ASM

BLD386 STARTUP.OBJ, MAIN.OBJ buildfile(EPROM.BLD) bootstrap(STARTUP)

Bootload

BLD386 performs several operations in this example:

• It allocates physical memory location to segments and tables.

• It generates tables using the build file and the input files.

• It links object files and resolves references.

• It generates a boot-loadable file to be programmed into the EPROM.

Example 9-4 shows the build file used as an input to BLD386 to perform the above functions.

1 2 ... 402 403 404 405 406 407 408 409 410 411 412 ... 635 636

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