diff options
Diffstat (limited to 'sys/boot/arm/at91/boot0/arm_init.s')
| -rw-r--r-- | sys/boot/arm/at91/boot0/arm_init.s | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/sys/boot/arm/at91/boot0/arm_init.s b/sys/boot/arm/at91/boot0/arm_init.s new file mode 100644 index 0000000..58c9099 --- /dev/null +++ b/sys/boot/arm/at91/boot0/arm_init.s @@ -0,0 +1,105 @@ +/*- + * Copyright (c) 2006 M. Warner Losh. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * + * 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. + * + * This software is derived from code provided by Kwikbyte with the + * following information: + * + * Initialization for C-environment and basic operation. Adapted from + * ATMEL cstartup.s. + * + * No warranty, expressed or implied, is included with this software. It is + * provided "AS IS" and no warranty of any kind including statutory or aspects + * relating to merchantability or fitness for any purpose is provided. All + * intellectual property rights of others is maintained with the respective + * owners. This software is not copyrighted and is intended for reference + * only. + * + * $FreeBSD$ + */ + + .equ ARM_MODE_USER, 0x10 + .equ ARM_MODE_FIQ, 0x11 + .equ ARM_MODE_IRQ, 0x12 + .equ ARM_MODE_SVC, 0x13 + .equ ARM_MODE_ABORT, 0x17 + .equ ARM_MODE_UNDEF, 0x1B + .equ ARM_MODE_SYS, 0x1F + + .equ I_BIT, 0x80 + .equ F_BIT, 0x40 + .equ T_BIT, 0x20 + +/* + * Stack definitions + * + * Start near top of internal RAM. + */ + + .equ END_INT_SRAM, 0x4000 + .equ SVC_STACK_START, (END_INT_SRAM - 0x4) + .equ SVC_STACK_USE, 0x21800000 + +start: + +/* vectors - must reside at address 0 */ +/* the format of this table is defined in the datasheet */ + B InitReset @; reset +undefvec: + B undefvec @; Undefined Instruction +swivec: + B swivec @; Software Interrupt +pabtvec: + B pabtvec @; Prefetch Abort +dabtvec: + B dabtvec @; Data Abort +rsvdvec: + B rsvdvec +irqvec: + ldr pc, [pc,#-0xF20] @; IRQ : read the AIC +fiqvec: + B fiqvec @; FIQ + + +InitReset: + +/* Set stack and init for SVC */ + ldr r1, = SVC_STACK_START + mov sp, r1 @; Init stack SYS + + msr cpsr_c, #(ARM_MODE_SVC | I_BIT | F_BIT) + mov sp, r1 @ ; Init stack SYS + +/* Perform system initialization */ + + .extern _init + bl _init + +/* Start execution at main */ + + .extern main + bl main + +/* main should not return. If it does, spin forever */ + +infiniteLoop: + b infiniteLoop |
