/**************************************************************************** * arch/arm/src/arm/lpc2378/lpc23xx_head.S * * Copyright (C) 2010 Rommel Marcelo. All rights reserved. * Author: Rommel Marcelo * * This file is part of the NuttX RTOS and based on the lpc2148 port: * * Copyright (C) 2010, 2012, 2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "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 * COPYRIGHT OWNER OR CONTRIBUTORS 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include "arm.h" #include "internal.h" #include "up_arch.h" #include "lpc23xx_uart.h" #include "lpc23xx_scb.h" #include "lpc23xx_pinsel.h" /**************************************************************************** * Macros ****************************************************************************/ /* Print a character on the UART to show boot status. This macro will * modify r0, r1, r2 and r14 */ #ifdef CONFIG_DEBUG .macro showprogress, code mov r0, #\code bl up_lowputc .endm #else .macro showprogress, code .endm #endif /***************************************************************************** * Text *****************************************************************************/ .text /***************************************************************************** * Name: _vector_table * * Description: * Interrrupt vector table. This must be located at the beginning * of the memory space (at CONFIG_LPC2378_CODE_BASE). The first entry in * the vector table is the reset vector and this is the code that * will execute whn the processor is reset. * *****************************************************************************/ .globl _vector_table .type _vector_table, %function _vector_table: ldr pc, .Lresethandler /* 0x00: Reset */ ldr pc, .Lundefinedhandler /* 0x04: Undefined instruction */ ldr pc, .Lswihandler /* 0x08: Software interrupt */ ldr pc, .Lprefetchaborthandler /* 0x0c: Prefetch abort */ ldr pc, .Ldataaborthandler /* 0x10: Data abort */ .long 0xB8A06F58 /* 0x14: Vector checksum */ ldr pc, .Lirqhandler /* 0x18: IRQ */ ldr pc, .Lfiqhandler /* 0x1c: FIQ */ .globl __start .globl up_vectorundefinsn .globl up_vectorswi .globl up_vectorprefetch .globl up_vectordata .globl up_vectorirq .globl up_vectorfiq .Lresethandler: .long __start .Lundefinedhandler: .long up_vectorundefinsn .Lswihandler: .long up_vectorswi .Lprefetchaborthandler: .long up_vectorprefetch .Ldataaborthandler: .long up_vectordata .Lirqhandler: .long up_vectorirq .Lfiqhandler: .long up_vectorfiq .size _vector_table, . - _vector_table /**************************************************************************** * OS Entry Point ****************************************************************************/ /* We assume the bootloader has already initialized most of the h/w for * us and that only leaves us having to do some os specific things * below. */ .text .globl __start .type __start, #function __start: /* Call lowlevel init C-function */ .extern ConfigurePLL ldr r0, =ConfigurePLL mov lr, pc bx r0 /* First, setup initial processor mode */ mov r0, #(SVC_MODE | PSR_I_BIT | PSR_F_BIT ) msr cpsr, r0 /* Configure the uart so that we can get debug output as soon * as possible. Modifies r0, r1, r2, and r14. */ bl up_lowsetup showprogress 'A' /* Setup system stack (and get the BSS range) */ adr r0, LC0 ldmia r0, {r4, r5, sp} /* Clear system BSS section (Initialize with 0) */ mov r0, #0 1: cmp r4, r5 strcc r0, [r4], #4 bcc 1b showprogress 'B' /* Copy system .data sections to new home in RAM. */ adr r3, LC2 ldmia r3, {r0, r1, r2} 2: ldmia r0!, {r3 - r10} stmia r1!, {r3 - r10} cmp r1, r2 blt 2b /* Perform early serial initialization */ mov fp, #0 #ifdef USE_EARLYSERIALINIT bl up_earlyserialinit showprogress 'S' #endif showprogress 'C' showprogress '\n' /* Initialize onboard LEDs */ #ifdef CONFIG_ARCH_LEDS bl board_led_initialize #endif /* Then jump to OS entry */ b os_start /* Variables: * _sbss is the start of the BSS region (see ld.script) * _ebss is the end of the BSS regsion (see ld.script) * The idle task stack starts at the end of BSS and is * of size CONFIG_IDLETHREAD_STACKSIZE. The heap continues * from there until the end of memory. See g_idle_topstack * below. */ LC0: .long _sbss .long _ebss .long _ebss+CONFIG_IDLETHREAD_STACKSIZE-4 LC2: .long _eronly /* Where .data defaults are stored in FLASH */ .long _sdata /* Where .data needs to reside in SDRAM */ .long _edata .size __start, .-__start /* This global variable is unsigned long g_idle_topstack and is * exported from here only because of its coupling to LCO * above. */ .data .align 4 .globl g_idle_topstack .type g_idle_topstack, object g_idle_topstack: .long _ebss+CONFIG_IDLETHREAD_STACKSIZE .size g_idle_topstack, .-g_idle_topstack .end