| 1 | #
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| 2 | # Copyright (c) 2007 Michal Kebrt
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 | #include <arch/asm/boot.h>
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| 30 |
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| 31 | .text
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| 32 |
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| 33 | .global kernel_image_start
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| 34 | .global exc_stack
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| 35 | .global supervisor_sp
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| 36 |
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| 37 | kernel_image_start:
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| 38 |
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| 39 | # initialize Stack pointer for exception modes
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| 40 | mrs r4, cpsr
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| 41 | bic r4, r4, #0x1f
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| 42 |
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| 43 | #FIQ Mode
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| 44 | orr r3, r4, #0x11
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| 45 | msr cpsr_c, r3
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| 46 | ldr sp, =exc_stack
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| 47 |
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| 48 | #IRQ Mode
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| 49 | orr r3, r4, #0x12
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| 50 | msr cpsr_c, r3
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| 51 | ldr sp, =exc_stack
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| 52 |
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| 53 | #ABORT Mode
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| 54 | orr r3, r4, #0x17
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| 55 | msr cpsr_c, r3
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| 56 | ldr sp, =exc_stack
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| 57 |
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| 58 | #UNDEFINED Mode
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| 59 | orr r3, r4, #0x1b
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| 60 | msr cpsr_c, r3
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| 61 | ldr sp, =exc_stack
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| 62 |
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| 63 | # switch to supervisor mode
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| 64 | orr r3, r4, #0x13
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| 65 | msr cpsr_c, r3
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| 66 |
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| 67 | ldr sp, =temp_stack
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| 68 |
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| 69 | bl arch_pre_main
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| 70 |
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| 71 | bl main_bsp
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| 72 |
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| 73 | .space TEMP_STACK_SIZE
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| 74 | temp_stack:
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| 75 |
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| 76 | .space 1024
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| 77 | exc_stack:
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| 78 |
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| 79 | supervisor_sp:
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| 80 | .space 4
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