235 lines
6.5 KiB
ArmAsm
Executable File
235 lines
6.5 KiB
ArmAsm
Executable File
/****************************************************************************
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* arch/arm/src/arm/lpc2378/lpc23xx_head.S
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*
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* Copyright (C) 2010 Rommel Marcelo. All rights reserved.
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* Author: Rommel Marcelo
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*
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* This file is part of the NuttX RTOS and based on the lpc2148 port:
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*
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* Copyright (C) 2010, 2012, 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 NuttX 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 <arch/board/board.h>
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#include "arm.h"
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#include "internal.h"
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#include "up_arch.h"
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#include "lpc23xx_uart.h"
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#include "lpc23xx_scb.h"
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#include "lpc23xx_pinsel.h"
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/****************************************************************************
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* Macros
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****************************************************************************/
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/* Print a character on the UART to show boot status. This macro will
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* modify r0, r1, r2 and r14
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*/
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#ifdef CONFIG_DEBUG
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.macro showprogress, code
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mov r0, #\code
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bl up_lowputc
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.endm
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#else
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.macro showprogress, code
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.endm
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#endif
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/*****************************************************************************
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* Text
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*****************************************************************************/
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.text
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/*****************************************************************************
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* Name: _vector_table
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*
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* Description:
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* Interrrupt vector table. This must be located at the beginning
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* of the memory space (at CONFIG_LPC2378_CODE_BASE). The first entry in
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* the vector table is the reset vector and this is the code that
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* will execute whn the processor is reset.
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*
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*****************************************************************************/
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.globl _vector_table
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.type _vector_table, %function
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_vector_table:
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ldr pc, .Lresethandler /* 0x00: Reset */
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ldr pc, .Lundefinedhandler /* 0x04: Undefined instruction */
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ldr pc, .Lswihandler /* 0x08: Software interrupt */
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ldr pc, .Lprefetchaborthandler /* 0x0c: Prefetch abort */
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ldr pc, .Ldataaborthandler /* 0x10: Data abort */
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.long 0xB8A06F58 /* 0x14: Vector checksum */
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ldr pc, .Lirqhandler /* 0x18: IRQ */
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ldr pc, .Lfiqhandler /* 0x1c: FIQ */
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.globl __start
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.globl up_vectorundefinsn
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.globl up_vectorswi
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.globl up_vectorprefetch
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.globl up_vectordata
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.globl up_vectorirq
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.globl up_vectorfiq
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.Lresethandler:
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.long __start
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.Lundefinedhandler:
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.long up_vectorundefinsn
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.Lswihandler:
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.long up_vectorswi
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.Lprefetchaborthandler:
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.long up_vectorprefetch
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.Ldataaborthandler:
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.long up_vectordata
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.Lirqhandler:
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.long up_vectorirq
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.Lfiqhandler:
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.long up_vectorfiq
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.size _vector_table, . - _vector_table
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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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.text
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.globl __start
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.type __start, #function
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__start:
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/* Call lowlevel init C-function */
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.extern ConfigurePLL
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ldr r0, =ConfigurePLL
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mov lr, pc
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bx r0
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/* First, setup initial processor mode */
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mov r0, #(SVC_MODE | PSR_I_BIT | PSR_F_BIT )
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msr cpsr, r0
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/* Configure the uart so that we can get debug output as soon
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* as possible. Modifies r0, r1, r2, and r14.
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*/
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bl up_lowsetup
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showprogress 'A'
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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 (Initialize with 0) */
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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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showprogress 'B'
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/* Copy system .data sections to new home in RAM. */
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adr r3, LC2
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ldmia r3, {r0, r1, r2}
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2: ldmia r0!, {r3 - r10}
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stmia r1!, {r3 - r10}
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cmp r1, r2
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blt 2b
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/* Perform early serial initialization */
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mov fp, #0
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#ifdef USE_EARLYSERIALINIT
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bl up_earlyserialinit
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showprogress 'S'
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#endif
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showprogress 'C'
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showprogress '\n'
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/* Initialize onboard LEDs */
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#ifdef CONFIG_ARCH_LEDS
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bl board_led_initialize
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#endif
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/* Then jump to OS entry */
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b os_start
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/* Variables:
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* _sbss is the start of the BSS region (see ld.script)
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* _ebss is the end of the BSS regsion (see ld.script)
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* The idle task stack starts at the end of BSS and is
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* of size CONFIG_IDLETHREAD_STACKSIZE. The heap continues
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* from there until the end of memory. See g_idle_topstack
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* below.
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*/
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LC0: .long _sbss
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.long _ebss
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.long _ebss+CONFIG_IDLETHREAD_STACKSIZE-4
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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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.size __start, .-__start
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/* This global variable is unsigned long g_idle_topstack and is
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* exported from here only because of its coupling to LCO
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* above.
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*/
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.data
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.align 4
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.globl g_idle_topstack
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.type g_idle_topstack, object
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g_idle_topstack:
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.long _ebss+CONFIG_IDLETHREAD_STACKSIZE
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.size g_idle_topstack, .-g_idle_topstack
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.end
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