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|
/*-------------------------------------------------------------------------+
| This file contains the PC386 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.
+--------------------------------------------------------------------------+
| (C) Copyright 1997 -
| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
|
| http://pandora.ist.utl.pt
|
| Instituto Superior Tecnico * Lisboa * PORTUGAL
+--------------------------------------------------------------------------+
| Disclaimer:
|
| This file is provided "AS IS" without warranty of any kind, either
| expressed or implied.
+--------------------------------------------------------------------------+
| This code is based on:
| bspstart.c,v 1.8 1996/05/28 13:12:40 joel Exp - go32 BSP
| With the following copyright notice:
| **************************************************************************
| * COPYRIGHT (c) 1989-1999.
| * On-Line Applications Research Corporation (OAR).
| *
| * 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 <bsp.h>
#include <rtems/libio.h>
#include <rtems/libcsupport.h>
#include <rtems/pci.h>
#include <libcpu/cpuModel.h>
/*-------------------------------------------------------------------------+
| Global Variables
+--------------------------------------------------------------------------*/
extern uint32_t _end; /* End of BSS. Defined in 'linkcmds'. */
/* rudimentary multiboot info */
struct multiboot_info {
uint32_t flags; /* start.S only raises flags for items actually saved; this allows us to check for the size of the data structure */
uint32_t mem_lower; /* avail kB in lower memory */
uint32_t mem_upper; /* avail kB in lower memory */
/* ... (unimplemented) */
};
extern struct multiboot_info _boot_multiboot_info;
/*
* 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;
/* Alternative way to hardcode the board's memory size [rather than heap size].
* Can easily be overridden by application.
*/
extern uint32_t bsp_mem_size
__attribute__ ((weak, alias("bsp_mem_size_default")));
uint32_t bsp_mem_size_default = 0;
/* Size of stack used during initialization. Defined in 'start.s'. */
extern uint32_t _stack_size;
uint32_t rtemsFreeMemStart;
/* Address of start of free memory - should be updated
after creating new partitions or regions. */
/*-------------------------------------------------------------------------+
| External Prototypes
+--------------------------------------------------------------------------*/
extern void rtems_irq_mngt_init(void);
void bsp_libc_init( void *, uint32_t, int );
/*-------------------------------------------------------------------------+
| Function: bsp_pretasking_hook
| Description: 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.
| Global Variables: None.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void bsp_pretasking_hook(void)
{
uint32_t topAddr, val;
int i, lowest;
if (rtemsFreeMemStart & (CPU_ALIGNMENT - 1)) /* not aligned => align it */
rtemsFreeMemStart = (rtemsFreeMemStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);
/* find the lowest 1M boundary to probe */
lowest = ((rtemsFreeMemStart + (1<<20)) >> 20) + 1;
if ( lowest < 2 )
lowest = 2;
/* The memory detection algorithm is very crude; try
* to use multiboot info, if possible (set from start.S)
*/
if ( bsp_mem_size == 0 &&
(_boot_multiboot_info.flags & 1) &&
_boot_multiboot_info.mem_upper ) {
bsp_mem_size = _boot_multiboot_info.mem_upper * 1024;
}
if ( _heap_size == 0 ) {
if ( bsp_mem_size == 0 ) {
/*
* We have to dynamically size memory. Memory size can be anything
* between no less than 2M and 2048M.
* let us first write
*/
for (i=2048; i>=lowest; i--) {
topAddr = i*1024*1024 - 4;
*(volatile uint32_t*)topAddr = topAddr;
}
for(i=lowest; i<=2048; i++) {
topAddr = i*1024*1024 - 4;
val = *(uint32_t*)topAddr;
if (val != topAddr) {
break;
}
}
topAddr = (i-1)*1024*1024 - 4;
} else {
topAddr = bsp_mem_size;
}
if ( rtemsFreeMemStart > topAddr ) {
printk( "Out of memory -- unable to initialize BSP\n" );
rtems_fatal_error_occurred( 0x85858585 );
}
_heap_size = topAddr - rtemsFreeMemStart;
}
bsp_libc_init((void *)rtemsFreeMemStart, _heap_size, 0);
rtemsFreeMemStart += _heap_size; /* HEAP_SIZE in KBytes */
#ifdef RTEMS_DEBUG
rtems_debug_enable(RTEMS_DEBUG_ALL_MASK);
#endif /* RTEMS_DEBUG */
} /* bsp_pretasking_hook */
/*-------------------------------------------------------------------------+
| Function: bsp_start
| Description: Called before main is invoked.
| Global Variables: None.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void bsp_start_default( void )
{
int pci_init_retval;
void Calibrate_loop_1ms(void);
/*
* Calibrate variable for 1ms-loop (see timer.c)
*/
Calibrate_loop_1ms();
/* set the value of start of free memory. */
rtemsFreeMemStart = (uint32_t)&_end + _stack_size;
/* Place RTEMS workspace at beginning of free memory. */
if (rtemsFreeMemStart & (CPU_ALIGNMENT - 1)) /* not aligned => align it */
rtemsFreeMemStart = (rtemsFreeMemStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);
Configuration.work_space_start = (void *)rtemsFreeMemStart;
rtemsFreeMemStart += rtems_configuration_get_work_space_size();
/*
* Init rtems interrupt management
*/
rtems_irq_mngt_init();
/*
* Init rtems exceptions management
*/
rtems_exception_init_mngt();
/*
* init PCI Bios interface...
*/
pci_init_retval = pci_initialize();
if (pci_init_retval != PCIB_ERR_SUCCESS) {
printk("PCI bus: could not initialize PCI BIOS interface\n");
}
#if 0
printk( "_heap_size = 0x%x\n", _heap_size );
printk( "_stack_size = 0x%x\n", _stack_size );
printk( "rtemsFreeMemStart = 0x%x\n", rtemsFreeMemStart );
printk( "work_space_start = 0x%x\n", rtems_configuration_get_work_space_start() );
printk( "work_space_size = 0x%x\n", rtems_configuration_get_work_space_size() );
#endif
} /* bsp_start */
/*
* 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")));
|
