126 lines
3.5 KiB
ArmAsm
126 lines
3.5 KiB
ArmAsm
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/************************************************************
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* up_head.S
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************/
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/************************************************************
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* Included Files
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************************************************************/
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#include <nuttx/config.h>
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#include "c5471.h"
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/************************************************************
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* Definitions
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************************************************************/
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/************************************************************
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* OS Entry Point
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************************************************************/
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/* We assume the bootloader has already initialized most of the h/w for
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* us and that only leaves us having to do some os specific things
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* below.
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*/
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.global __start
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.type __start, #function
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__start:
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/* First, setup initial processor mode */
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mov r0, #(SVC_MODE | I_BIT | F_BIT )
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msr cpsr, r0
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/* Setup system stack (and get the BSS range) */
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adr r0, LC0
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ldmia r0, {r4, r5, sp}
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/* Clear system BSS section */
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mov r0, #0
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1: cmp r4, r5
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strcc r0, [r4], #4
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bcc 1b
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/* Copy system .data sections to new home in RAM. */
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#ifdef CONFIG_BOOT_FROM_FLASH
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adr r3, LC2
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ldmia r3, {r0, r1, r2}
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1: ldmia r0!, {r3 - r10}
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stmia r1!, {r3 - r10}
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cmp r1, r2
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blt 1b
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#endif
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/* Initialize Kernel Stack Contents */
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#if 0
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mov r1, sp
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sub r1, r1, #INITIAL_STACK_SIZE
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ldr r0, L_STACK_MAGIC
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str r0, [r1], #4
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ldr r0, L_STACK_UNTOUCHED_MAGIC
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1: cmp r1, sp
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strcc r0, [r1], #4
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bcc 1b
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#endif
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/* Jump to OS entry */
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mov fp, #0
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b os_start
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/* Variables */
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LC0: .long _sbss
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.long _ebss
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.long CONFIG_STACK_POINTER+CONFIG_PROC_STACK_SIZE-4
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#ifdef CONFIG_BOOT_FROM_FLASH
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LC2: .long _eronly @ Where .data defaults are stored in Flash.
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.long _sdata @ Where .data needs to reside in SDRAM.
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.long _edata
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#endif
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#if 0
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L_STACK_UNTOUCHED_MAGIC: .long 0xfeef1ef0
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L_STACK_MAGIC: .long 0xdeadbeef
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#endif
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.end
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