Subversion Repositories openrisc

/*

 *  This routine starts the application.  It includes application,

 *  board, and monitor specific initialization and configuration.

 *  The generic CPU dependent initialization has been performed

 *  before this routine is invoked.

 *

 *  COPYRIGHT (c) 1989-1998.

 *  On-Line Applications Research Corporation (OAR).

 *  Copyright assigned to U.S. Government, 1994.

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  Modified to support the MCP750.

 *  Modifications Copyright (C) 1999 Eric Valette. valette@crf.canon.fr

 *

 *  $Id: bspstart.c,v 1.2 2001-09-27 12:01:07 chris Exp $

 */

#include <bsp.h>

#include <rtems/libio.h>

#include <libcsupport.h>

#include <string.h>

#include <bsp/consoleIo.h>

#include <libcpu/spr.h>

#include <bsp/residual.h>

#include <bsp/pci.h>

#include <bsp/openpic.h>

#include <bsp/irq.h>

#include <bsp.h>

#include <libcpu/bat.h>

#include <bsp/vectors.h>

#include <bsp/motorola.h>

extern void _return_to_ppcbug();

extern unsigned long __rtems_end;

extern unsigned long _end;

extern unsigned long __bss_start;

extern void L1_caches_enables();

extern unsigned get_L2CR();

extern void set_L2CR(unsigned);

extern void bsp_cleanup(void);

/*

 * Copy of residuals passed by firmware

 */

RESIDUAL residualCopy;

/*

 * Copy Additional boot param passed by boot loader

 */

#define MAX_LOADER_ADD_PARM 80

char loaderParam[MAX_LOADER_ADD_PARM];

/*

 * Vital Board data Start using DATA RESIDUAL

 */

/*

 * Total memory using RESIDUAL DATA

 */

unsigned int BSP_mem_size;

/*

 * PCI Bus Frequency

 */

unsigned int BSP_bus_frequency;

/*

 * processor clock frequency

 */

unsigned int BSP_processor_frequency;

/*

 * Time base divisior (how many tick for 1 second).

 */

unsigned int BSP_time_base_divisor;

/*

 * system init stack and soft ir stack size

 */

#define INIT_STACK_SIZE 0x1000

#define INTR_STACK_SIZE CONFIGURE_INTERRUPT_STACK_MEMORY

void BSP_panic(char *s)

{

  printk("%s PANIC %s\n",_RTEMS_version, s);

  __asm__ __volatile ("sc");

}

void _BSP_Fatal_error(unsigned int v)

{

  printk("%s PANIC ERROR %x\n",_RTEMS_version, v);

  __asm__ __volatile ("sc");

}

/*

 *  The original table from the application and our copy of it with

 *  some changes.

 */

extern rtems_configuration_table Configuration;

rtems_configuration_table  BSP_Configuration;

rtems_cpu_table Cpu_table;

char *rtems_progname;

/*

 *  Use the shared implementations of the following routines

 */

void bsp_postdriver_hook(void);

void bsp_libc_init( void *, unsigned32, int );

/*

 *  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)

{

    rtems_unsigned32        heap_start;

    rtems_unsigned32        heap_size;

    heap_start = ((rtems_unsigned32) &__rtems_end) +INIT_STACK_SIZE + INTR_STACK_SIZE;

    if (heap_start & (CPU_ALIGNMENT-1))

        heap_start = (heap_start + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);

    heap_size = (BSP_mem_size - heap_start) - BSP_Configuration.work_space_size;

#ifdef SHOW_MORE_INIT_SETTINGS

    printk(" HEAP start %x  size %x\n", heap_start, heap_size);

#endif    

    bsp_libc_init((void *) heap_start, heap_size, 0);

#ifdef RTEMS_DEBUG

    rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );

#endif

}

void zero_bss()

{

  memset(&__bss_start, 0, ((unsigned) (&__rtems_end)) - ((unsigned) &__bss_start));

}

void save_boot_params(RESIDUAL* r3, void *r4, void* r5, char *additional_boot_options)

{

  residualCopy = *r3;

  strncpy(loaderParam, additional_boot_options, MAX_LOADER_ADD_PARM);

  loaderParam[MAX_LOADER_ADD_PARM - 1] ='\0';

}

/*

 *  bsp_start

 *

 *  This routine does the bulk of the system initialization.

 */

void bsp_start( void )

{

  int err;

  unsigned char *stack;

  unsigned l2cr;

  register unsigned char* intrStack;

  register unsigned int intrNestingLevel = 0;

  unsigned char *work_space_start;

  ppc_cpu_id_t myCpu;

  ppc_cpu_revision_t myCpuRevision;

  prep_t boardManufacturer;

  motorolaBoard myBoard;

  /*

   * 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();

  /*

   * enables L1 Cache. Note that the L1_caches_enables() codes checks for

   * relevant CPU type so that the reason why there is no use of myCpu...

   */

  L1_caches_enables();

  /*

   * Enable L2 Cache. Note that the set_L2CR(L2CR) codes checks for

   * relevant CPU type (mpc750)...

   */

  l2cr = get_L2CR();

#ifdef SHOW_LCR2_REGISTER

  printk("Initial L2CR value = %x\n", l2cr);

#endif  

  if ( (! (l2cr & 0x80000000)) && ((int) l2cr == -1))

    set_L2CR(0xb9A14000);

  /*

   * the initial stack  has aready been set to this value in start.S

   * so there is no need to set it in r1 again... It is just for info

   * so that It can be printed without accessing R1.

   */

  stack = ((unsigned char*) &__rtems_end) + INIT_STACK_SIZE - CPU_MINIMUM_STACK_FRAME_SIZE;

  /*

   * Initialize the interrupt related settings

   * SPRG0 = interrupt nesting level count

   * SPRG1 = software managed IRQ stack

   *

   * This could be done latter (e.g in IRQ_INIT) but it helps to understand

   * some settings below...

   */

  intrStack = ((unsigned char*) &__rtems_end) + INIT_STACK_SIZE + INTR_STACK_SIZE - CPU_MINIMUM_STACK_FRAME_SIZE;

  asm volatile ("mtspr  273, %0" : "=r" (intrStack) : "0" (intrStack));

  asm volatile ("mtspr  272, %0" : "=r" (intrNestingLevel) : "0" (intrNestingLevel));

  /*

   * Initialize default raw exception hanlders. See vectors/vectors_init.c

   */

  initialize_exceptions();

  /*

   * Init MMU block address translation to enable hardware

   * access

   */

  /*

   * PC legacy IO space used for inb/outb and all PC

   * compatible hardware

   */

  setdbat(1, 0x80000000, 0x80000000, 0x10000000, IO_PAGE);

  /*

   * PCI devices memory area. Needed to access OPENPIC features

   * provided by the RAVEN

   */

  setdbat(2, 0xc0000000, 0xc0000000, 0x08000000, IO_PAGE);

  /*

   * Must have acces to open pic PCI ACK registers

   * provided by the RAVEN

   */

  setdbat(3, 0xf0000000, 0xf0000000, 0x10000000, IO_PAGE);

  select_console(CONSOLE_LOG);

  /* We check that the keyboard is present and immediately

   * select the serial console if not.

   */

  err = kbdreset();

  if (err) select_console(CONSOLE_SERIAL);

  boardManufacturer   =  checkPrepBoardType(&residualCopy);

  if (boardManufacturer != PREP_Motorola) {

    printk("Unsupported hardware vendor\n");

    while (1);

  }

  myBoard = getMotorolaBoard();

  printk("-----------------------------------------\n");

  printk("Welcome to %s on %s\n", _RTEMS_version, motorolaBoardToString(myBoard));

  printk("-----------------------------------------\n");

#ifdef SHOW_MORE_INIT_SETTINGS  

  printk("Residuals are located at %x\n", (unsigned) &residualCopy);

  printk("Additionnal boot options are %s\n", loaderParam);

  printk("Initial system stack at %x\n",stack);

  printk("Software IRQ stack at %x\n",intrStack);

  printk("-----------------------------------------\n");

#endif

#ifdef TEST_RETURN_TO_PPCBUG  

  printk("Hit <Enter> to return to PPCBUG monitor\n");

  printk("When Finished hit GO. It should print <Back from monitor>\n");

  debug_getc();

  _return_to_ppcbug();

  printk("Back from monitor\n");

  _return_to_ppcbug();

#endif /* TEST_RETURN_TO_PPCBUG  */

#ifdef SHOW_MORE_INIT_SETTINGS

  printk("Going to start PCI buses scanning and initialization\n");

#endif  

  InitializePCI();

#ifdef SHOW_MORE_INIT_SETTINGS

  printk("Number of PCI buses found is : %d\n", BusCountPCI());

#endif

#ifdef TEST_RAW_EXCEPTION_CODE  

  printk("Testing exception handling Part 1\n");

  /*

   * Cause a software exception

   */

  __asm__ __volatile ("sc");

  /*

   * Check we can still catch exceptions and returned coorectly.

   */

  printk("Testing exception handling Part 2\n");

  __asm__ __volatile ("sc");

#endif  

  BSP_mem_size                          = residualCopy.TotalMemory;

  BSP_bus_frequency                     = residualCopy.VitalProductData.ProcessorBusHz;

  BSP_processor_frequency               = residualCopy.VitalProductData.ProcessorHz;

  BSP_time_base_divisor                 = (residualCopy.VitalProductData.TimeBaseDivisor?

                                           residualCopy.VitalProductData.TimeBaseDivisor : 4000);

  /*

   * Set up our hooks

   * Make sure libc_init is done before drivers initialized so that

   * they can use atexit()

   */

  Cpu_table.pretasking_hook      = bsp_pretasking_hook;    /* init libc, etc. */

  Cpu_table.postdriver_hook      = bsp_postdriver_hook;

  Cpu_table.do_zero_of_workspace = TRUE;

  Cpu_table.interrupt_stack_size = CONFIGURE_INTERRUPT_STACK_MEMORY;

  Cpu_table.clicks_per_usec      = BSP_processor_frequency/(BSP_time_base_divisor * 1000);

  Cpu_table.exceptions_in_RAM    = TRUE;

#ifdef SHOW_MORE_INIT_SETTINGS

  printk("BSP_Configuration.work_space_size = %x\n", BSP_Configuration.work_space_size);

#endif  

  work_space_start =

    (unsigned char *)BSP_mem_size - BSP_Configuration.work_space_size;

  if ( work_space_start <= ((unsigned char *)&__rtems_end) + INIT_STACK_SIZE + INTR_STACK_SIZE) {

    printk( "bspstart: Not enough RAM!!!\n" );

    bsp_cleanup();

  }

  BSP_Configuration.work_space_start = work_space_start;

  /*

   * Initalize RTEMS IRQ system

   */

  BSP_rtems_irq_mng_init(0);

#ifdef SHOW_MORE_INIT_SETTINGS

  printk("Exit from bspstart\n");

#endif  

}