/*===============================================================*\
| Project: RTEMS generic MPC83xx BSP |
+-----------------------------------------------------------------+
| Copyright (c) 2007 |
| Embedded Brains GmbH |
| Obere Lagerstr. 30 |
| D-82178 Puchheim |
| Germany |
| rtems@embedded-brains.de |
+-----------------------------------------------------------------+
| The license and distribution terms for this file may be |
| found in the file LICENSE in this distribution or at |
| |
| http://www.rtems.com/license/LICENSE. |
| |
+-----------------------------------------------------------------+
| this file contains the BSP startup code |
\*===============================================================*/
/*
* $Id$
*/
#include <bsp.h>
#include <rtems/libio.h>
#include <rtems/libcsupport.h>
#include <rtems/powerpc/powerpc.h>
#include <rtems/score/thread.h>
#include <rtems/bspIo.h>
#include <libcpu/cpuIdent.h>
#include <libcpu/spr.h>
#include <bsp/irq.h>
#include <string.h>
SPR_RW(SPRG0)
SPR_RW(SPRG1)
/*
* The original table from the application (in ROM) and our copy of it with
* some changes. Configuration is defined in <confdefs.h>. Make sure that
* our configuration tables are uninitialized so that they get allocated in
* the .bss section (RAM).
*/
extern rtems_configuration_table Configuration;
extern unsigned long intrStackPtr;
rtems_configuration_table BSP_Configuration;
static char *BSP_heap_start, *BSP_heap_end;
char *rtems_progname;
/*
* constants for c_clock driver:
* system bus frequency (for timebase etc)
* and
* Time base divisior: scaling value:
* BSP_time_base_divisor = TB ticks per millisecond/BSP_bus_frequency
*/
unsigned int BSP_bus_frequency = BSP_CSB_CLK_FRQ;
unsigned int BSP_time_base_divisor = 4000; /* 4 bus clicks per TB click */
/*
* Driver configuration parameters
*/
uint32_t bsp_clicks_per_usec;
/*
* Use the shared implementations of the following routines.
* Look in rtems/c/src/lib/libbsp/shared/bsppost.c and
* rtems/c/src/lib/libbsp/shared/bsplibc.c.
*/
void bsp_postdriver_hook(void);
void bsp_libc_init( void *, uint32_t, int );
extern void initialize_exceptions(void);
extern void cpu_init(void);
void BSP_panic(char *s)
{
printk("%s PANIC %s\n",_RTEMS_version, s);
/*
* FIXME: hang/restart system
*/
__asm__ __volatile ("sc");
}
void _BSP_Fatal_error(unsigned int v)
{
printk("%s PANIC ERROR %x\n",_RTEMS_version, v);
/*
* FIXME: hang/restart system
*/
__asm__ __volatile ("sc");
}
/*
* Function: bsp_pretasking_hook
* Created: 95/03/10
*
* Description:
* BSP pretasking hook. Called just before drivers are initialized.
* Used to setup libc and install any BSP extensions.
*
* NOTES:
* Must not use libc (to do io) from here, since drivers are
* not yet initialized.
*
*/
void
bsp_pretasking_hook(void)
{
/*
* initialize libc including the heap
*/
bsp_libc_init( BSP_heap_start,
BSP_heap_end - BSP_heap_start,
0);
#ifdef STACK_CHECKER_ON
/*
* Initialize the stack bounds checker
* We can either turn it on here or from the app.
*/
Stack_check_Initialize();
#endif
#ifdef RTEMS_DEBUG
rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );
#endif
}
void bsp_predriver_hook(void)
{
}
void bsp_calc_mem_layout()
{
/*
* these labels (!) are defined in the linker command file
* or when the linker is invoked
* NOTE: the information(size) is the address of the object,
* not the object otself
*/
extern unsigned char TopRamReserved;
extern unsigned char _WorkspaceBase[];
/*
* compute the memory layout:
* - first unused address is Workspace start
* - Heap starts at end of workspace
* - Heap ends at end of memory - reserved memory area
*/
BSP_Configuration.work_space_start = _WorkspaceBase;
BSP_heap_start = ((char *)BSP_Configuration.work_space_start +
BSP_Configuration.work_space_size);
#if defined(HAS_UBOOT)
BSP_heap_end = (uboot_bdinfo_ptr->bi_memstart
+ uboot_bdinfo_ptr->bi_memsize
- (uint32_t)&TopRamReserved);
#else
BSP_heap_end = (void *)(RAM_END - (uint32_t)&TopRamReserved);
#endif
}
void bsp_start(void)
{
ppc_cpu_id_t myCpu;
ppc_cpu_revision_t myCpuRevision;
register unsigned char* intrStack;
/*
* Get CPU identification dynamically. Note that the get_ppc_cpu_type() function
* store the result in global variables so that it can be used latter...
*/
myCpu = get_ppc_cpu_type();
myCpuRevision = get_ppc_cpu_revision();
/*
* determine heap and workspace placement
*/
bsp_calc_mem_layout();
cpu_init();
/*
* Initialize some SPRG registers related to irq handling
*/
intrStack = (((unsigned char*)&intrStackPtr) - PPC_MINIMUM_STACK_FRAME_SIZE);
_write_SPRG1((unsigned int)intrStack);
/* Signal them that this BSP has fixed PR288 - eventually, this should
* go away
*/
_write_SPRG0(PPC_BSP_HAS_FIXED_PR288);
/*
* initialize the device driver parameters
*/
bsp_clicks_per_usec = (BSP_CSB_CLK_FRQ/1000000);
/*
* Install our own set of exception vectors
*/
initialize_exceptions();
/*
* Enable instruction and data caches. Do not force writethrough mode.
*/
#if INSTRUCTION_CACHE_ENABLE
rtems_cache_enable_instruction();
#endif
#if DATA_CACHE_ENABLE
rtems_cache_enable_data();
#endif
/*
* Allocate the memory for the RTEMS Work Space. This can come from
* a variety of places: hard coded address, malloc'ed from outside
* RTEMS world (e.g. simulator or primitive memory manager), or (as
* typically done by stock BSPs) by subtracting the required amount
* of work space from the last physical address on the CPU board.
*/
/*
* Initalize RTEMS IRQ system
*/
BSP_rtems_irq_mng_init(0);
#ifdef SHOW_MORE_INIT_SETTINGS
printk("Exit from bspstart\n");
#endif
}
/*
*
* _Thread_Idle_body
*
* Replaces the one in c/src/exec/score/src/threadidlebody.c
* The MSR[POW] bit is set to put the CPU into the low power mode
* defined in HID0. HID0 is set during starup in start.S.
*
*/
Thread _Thread_Idle_body(uint32_t ignored )
{
for(;;)
{
asm volatile("mfmsr 3; oris 3,3,4; sync; mtmsr 3; isync; ori 3,3,0; ori 3,3,0");
}
return 0;
}
