Subversion Repositories mips789

##################################################################

# TITLE: Boot Up Code

# AUTHOR: Steve Rhoads (rhoadss@yahoo.com)

# DATE CREATED: 1/12/02

# FILENAME: boot.asm

# PROJECT: Plasma CPU core

# COPYRIGHT: Software placed into the public domain by the author.

#    Software 'as is' without warranty.  Author liable for nothing.

# DESCRIPTION:

#    Initializes the stack pointer and jumps to main2().

##################################################################

        .text

        .align  2

        .globl  entry

        .ent    entry

entry:

   .set noreorder

   #These eight instructions must be the first instructions.

   #convert.exe will correctly initialize $gp

   lui   $gp,0

   ori   $gp,$gp,0

   #convert.exe will set $4=.sbss_start $5=.bss_end

   lui   $4,0

   ori   $4,$4,0

   lui   $5,0

   ori   $5,$5,0

   lui   $sp,0

   ori   $sp,$sp,0xfff0     #initialize stack pointer

$BSS_CLEAR:

   sw    $0,0($4)

   slt   $3,$4,$5

   bnez  $3,$BSS_CLEAR

   addiu $4,$4,4

   jal   main2

   nop

$L1:

   j $L1

   .set reorder

        .end    entry