0,0 → 1,80 |
# |
# Copyright (c) 2007 Michal Kebrt |
# All rights reserved. |
# |
# Redistribution and use in source and binary forms, with or without |
# modification, are permitted provided that the following conditions |
# are met: |
# |
# - Redistributions of source code must retain the above copyright |
# notice, this list of conditions and the following disclaimer. |
# - Redistributions in binary form must reproduce the above copyright |
# notice, this list of conditions and the following disclaimer in the |
# documentation and/or other materials provided with the distribution. |
# - The name of the author may not be used to endorse or promote products |
# derived from this software without specific prior written permission. |
# |
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
# |
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#include <arch/asm/boot.h> |
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.text |
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.global kernel_image_start |
.global exc_stack |
.global supervisor_sp |
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kernel_image_start: |
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# initialize Stack pointer for exception modes |
mrs r4, cpsr |
bic r4, r4, #0x1f |
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#FIQ Mode |
orr r3, r4, #0x11 |
msr cpsr_c, r3 |
ldr sp, =exc_stack |
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#IRQ Mode |
orr r3, r4, #0x12 |
msr cpsr_c, r3 |
ldr sp, =exc_stack |
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#ABORT Mode |
orr r3, r4, #0x17 |
msr cpsr_c, r3 |
ldr sp, =exc_stack |
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#UNDEFINED Mode |
orr r3, r4, #0x1b |
msr cpsr_c, r3 |
ldr sp, =exc_stack |
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# switch to supervisor mode |
orr r3, r4, #0x13 |
msr cpsr_c, r3 |
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ldr sp, =temp_stack |
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bl arch_pre_main |
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bl main_bsp |
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.space TEMP_STACK_SIZE |
temp_stack: |
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.space 1024 |
exc_stack: |
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supervisor_sp: |
.space 4 |