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idiolatrie |
################################################################################
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# Boot Up Code #
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#------------------------------------------------------------------------------#
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# REFERENCES #
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# #
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# [1] The MIPS programmer's handbook #
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# Erin Frquhar and Philip Bunce #
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# San Francisco, CA, Morgan Kaufmann Publishers, 1994 #
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# ISBN 1-55860-297-6 #
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# #
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#------------------------------------------------------------------------------#
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# Copyright (C)2011 Mathias Hörtnagl <mathias.hoertnagl@gmail.com> #
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# #
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# This program is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# This program is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <http://www.gnu.org/licenses/>. #
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################################################################################
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.ifndef STACKSIZE # Stack size in byte.
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.set STACKSIZE, 8192
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.endif
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.comm stack, STACKSIZE # Global memory: stack.
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.text
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.align 2
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################################################################################
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# Execution Start #
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#------------------------------------------------------------------------------#
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.globl boot
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.ent boot
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boot:
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.set noreorder
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la $gp, _gp # Set global pointer.
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la $sp, stack+STACKSIZE-24 # Set stack pointer.
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la $v0, _bss_start # Global variable region start.
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la $v1, _bss_end # Global variable region end.
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clrbss: # Clear global variable region.
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sw $0, ($v0)
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addiu $v0, 4
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blt $v0, $v1, clrbss # Continue execution when .bss region is clear.
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nop
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.set noat
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and $at, $0, $0 # Clear all registers.
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.set at
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and $v0, $0, $0
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and $v1, $0, $0
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and $a0, $0, $0
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and $a1, $0, $0
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and $a2, $0, $0
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and $a3, $0, $0
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and $t0, $0, $0
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and $t1, $0, $0
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and $t2, $0, $0
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and $t3, $0, $0
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and $t4, $0, $0
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and $t5, $0, $0
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and $t6, $0, $0
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and $t7, $0, $0
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and $s0, $0, $0
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and $s1, $0, $0
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and $s2, $0, $0
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and $s3, $0, $0
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and $s4, $0, $0
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and $s5, $0, $0
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and $s6, $0, $0
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and $s7, $0, $0
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and $t8, $0, $0
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and $t9, $0, $0
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and $k0, $0, $0
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and $k1, $0, $0
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and $fp, $0, $0
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and $ra, $0, $0
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jal main # Start execution of the C main procedure.
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nop
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loop: # Final loop. Afer returning from C main loop.
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nop
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j loop # Real Infinity.
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nop
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nop
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.set reorder
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.end boot
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################################################################################
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# Start Flash Application #
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#------------------------------------------------------------------------------#
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.globl start
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.ent start
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start:
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.set noreorder
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lui $k0, 0x2000
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jr $k0
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nop
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.set reorder
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.end start
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