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Rev 51 |
##################################################################
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##################################################################
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# TITLE: Boot Up Code
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# TITLE: Boot Up Code
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# AUTHOR: Steve Rhoads (rhoadss@yahoo.com)
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# AUTHOR: Steve Rhoads (rhoadss@yahoo.com)
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# DATE CREATED: 1/12/02
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# DATE CREATED: 1/12/02
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# FILENAME: boot.asm
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# FILENAME: boot.asm
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# PROJECT: Plasma CPU core
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# PROJECT: Plasma CPU core
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# COPYRIGHT: Software placed into the public domain by the author.
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# COPYRIGHT: Software placed into the public domain by the author.
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# Software 'as is' without warranty. Author liable for nothing.
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# Software 'as is' without warranty. Author liable for nothing.
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# DESCRIPTION:
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# DESCRIPTION:
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# Initializes the stack pointer and jumps to main2().
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# Initializes the stack pointer and jumps to main2().
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##################################################################
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##################################################################
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.text
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.text
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.align 2
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.align 2
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.globl entry
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.globl entry
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.ent entry
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.ent entry
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entry:
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entry:
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.set noreorder
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.set noreorder
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#These eight instructions must be the first instructions.
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#These eight instructions must be the first instructions.
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#convert.exe will correctly initialize $gp
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#convert.exe will correctly initialize $gp
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lui $gp,0
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lui $gp,0
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ori $gp,$gp,0
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ori $gp,$gp,0
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#convert.exe will set $4=.sbss_start $5=.bss_end
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#convert.exe will set $4=.sbss_start $5=.bss_end
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lui $4,0
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lui $4,0
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ori $4,$4,0
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ori $4,$4,0
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lui $5,0
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lui $5,0
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ori $5,$5,0
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ori $5,$5,0
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lui $sp,0
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lui $sp,0
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ori $sp,$sp,0xfff0 #initialize stack pointer
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ori $sp,$sp,0xfff0 #initialize stack pointer
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$BSS_CLEAR:
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$BSS_CLEAR:
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sw $0,0($4)
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sw $0,0($4)
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slt $3,$4,$5
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slt $3,$4,$5
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bnez $3,$BSS_CLEAR
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bnez $3,$BSS_CLEAR
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addiu $4,$4,4
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addiu $4,$4,4
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jal main2
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jal main2
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nop
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nop
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$L1:
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$L1:
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j $L1
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j $L1
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.set reorder
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.set reorder
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.end entry
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.end entry
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