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/**
* @file bspstart.c
*
* This file contains the GBA BSP startup package.
* It includes application, board, and monitor specific initialization and
* configuration. The generic CPU dependent initialization has been
* performed before this routine is invoked.
*/
/*
* RTEMS GBA BSP
*
* Copyright (c) 2004 Markku Puro <markku.puro@kopteri.net>
*
* The license and distribution terms for this file may be
* found in found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <stdio.h>
#include <bsp.h>
#include <rtems/bspIo.h>
#include <rtems/libio.h>
#include <rtems/libcsupport.h>
#include <gba.h>
#include <conio.h>
#define BSP_DEBUG 0
/* Global Variables, Defined in 'linkcmds' */
extern void _end;
extern void _stack_size;
extern void _irq_max_vector;
extern void __heap_limit;
extern void __ro_start;
extern void __ro_end;
extern void __data_start;
extern void __data_end;
extern void __load_start_data;
extern void __load_stop_data;
extern void __ewram_start;
extern void __ewram_end;
extern void __load_start_ewram;
extern void __load_stop_ewram;
extern void __iwram_start;
extern void __iwram_end;
extern void __load_start_iwram;
extern void __load_stop_iwram;
extern void __bss_start;
extern void __bss_end;
/* External Prototypes */
extern void bsp_cleanup( void );
extern void rtems_irq_mngt_init(void);
extern void bsp_libc_init( void *, uint32_t, int );
extern void bsp_postdriver_hook(void);
/** Chip registers */
volatile unsigned int *Regs = (unsigned int *)GBA_IO_REGS_ADDR;
/**
* Size of heap if it is 0 it will be dynamically defined by memory size,
* otherwise the value should be changed by binary patch
*/
uint32_t _heap_size = 0;
/** Address of start of free memory - should be updated after creating new partitions or regions.*/
uint32_t rtemsFreeMemStart;
/**
* @brief BSP pretasking hook.
*
* Called just before drivers are initialized.
* Used to setup libc and install any BSP extensions.
*
* NOTE: Must not use libc (to do io) from here, since drivers are not yet initialized.
*
* @param None
* @return None
*/
void bsp_pretasking_hook(void)
{
if (_heap_size == 0) {
_heap_size = (uint32_t)&__heap_limit - rtemsFreeMemStart;
}
bsp_libc_init((void *)rtemsFreeMemStart, _heap_size, 0);
rtemsFreeMemStart += _heap_size;
#ifdef RTEMS_DEBUG
rtems_debug_enable(RTEMS_DEBUG_ALL_MASK);
#endif /* RTEMS_DEBUG */
#if BSP_DEBUG
/* The following information is very useful when debugging. */
printk("[bsp_pretasking_hook]\n");
printk("_heap_size = 0x%x\n", _heap_size);
printk("_stack_size = 0x%x\n", (uint32_t)&_stack_size);
printk("_irq_max_vector = 0x%x\n", (uint32_t)&_irq_max_vector);
printk("__ro_start = 0x%x : __ro_end = 0x%x\n", (uint32_t)&__ro_start, (uint32_t)&__ro_end);
printk("__ewram_start = 0x%x : __ewram_end = 0x%x\n", (uint32_t)&__ewram_start, (uint32_t)&__ewram_end);
printk("__data_start = 0x%x : __data_end = 0x%x\n", (uint32_t)&__data_start, (uint32_t)&__data_end);
printk("__bss_start = 0x%x : __bss_end = 0x%x\n", (uint32_t)&__bss_start,(uint32_t)&__bss_end);
printk("__iwram_start = 0x%x : __iwram_end = 0x%x\n", (uint32_t)&__iwram_start,(uint32_t)&__iwram_end);
printk("__load_start_iwram = 0x%x\n", (uint32_t)&__load_start_iwram);
printk("__load_stop_iwram = 0x%x\n", (uint32_t)&__load_stop_iwram);
printk("__load_start_ewram = 0x%x\n", (uint32_t)&__load_start_ewram);
printk("__load_stop_ewram = 0x%x\n", (uint32_t)&__load_stop_ewram);
printk("__load_start_data = 0x%x\n", (uint32_t)&__load_start_data);
printk("__load_stop_data = 0x%x\n", (uint32_t)&__load_stop_data);
#endif
}
/**
* @brief BSP Start
*
* Called before main is invoked.
*
* @param None
* @return None
*/
void bsp_start_default( void )
{
/* set the value of start of free memory. */
rtemsFreeMemStart = (uint32_t)&_end;
/* Place RTEMS workspace at beginning of free memory. */
Configuration.work_space_start = (void *)rtemsFreeMemStart;
rtemsFreeMemStart += rtems_configuration_get_work_space_size();
/* Init conio */
gba_textmode(CO60);
/* Init rtems exceptions management */
/*!!!!!GBA - Can't use exception vectors in GBA because they are already in GBA ROM BIOS */
/* rtems_exception_init_mngt(); */
/* Init rtems interrupt management */
rtems_irq_mngt_init();
#if BSP_DEBUG
/* The following information is very useful when debugging. */
printk("[bsp_start]\n");
printk("rtemsFreeMemStart= 0x%x\n", rtemsFreeMemStart);
printk("__heap_limit = 0x%x\n", (uint32_t)&__heap_limit);
printk("work_space_start = 0x%x size = 0x%x\n",
Configuration.work_space_start,
rtems_configuration_get_work_space_size());
printk("microseconds_per_tick = 0x%x\n",
rtems_configuration_get_microseconds_per_tick());
printk("ticks_per_timeslice = 0x%x\n",
rtems_configuration_get_ticks_per_timeslice());
#endif
/* Do we have enough memory */
if ((uint32_t)&__heap_limit < rtemsFreeMemStart) {
printk("\nFatal Error: Memory overflow[0x%x]!\n",rtemsFreeMemStart);
bsp_cleanup();
}
}
/**
* @brief weak alias for bsp_start_default
*
* By making this a weak alias for bsp_start_default, a brave soul
* can override the actual bsp_start routine used.
*/
void bsp_start (void) __attribute__ ((weak, alias("bsp_start_default")));
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