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@c

@c  COPYRIGHT (c) 1988-2002.

@c  On-Line Applications Research Corporation (OAR).

@c  All rights reserved.

@c

@c  cputable.t,v 1.12 2002/01/17 21:47:46 joel Exp

@c

@chapter Processor Dependent Information Table

@section Introduction

Any highly processor dependent information required

to describe a processor to RTEMS is provided in the CPU

Dependent Information Table.  This table is not required for all

processors supported by RTEMS.  This chapter describes the

contents, if any, for a particular processor type.

@section CPU Dependent Information Table

The PowerPC version of the RTEMS CPU Dependent

Information Table is given by the C structure definition is

shown below:

@example

typedef struct @{

  void       (*pretasking_hook)( void );

  void       (*predriver_hook)( void );

  void       (*postdriver_hook)( void );

  void       (*idle_task)( void );

  boolean      do_zero_of_workspace;

  unsigned32   idle_task_stack_size;

  unsigned32   interrupt_stack_size;

  unsigned32   extra_mpci_receive_server_stack;

  void *     (*stack_allocate_hook)( unsigned32 );

  void       (*stack_free_hook)( void* );

  /* end of fields required on all CPUs */

  unsigned32   clicks_per_usec;       /* Timer clicks per microsecond */

  void       (*spurious_handler)(

                unsigned32 vector, CPU_Interrupt_frame *);

  boolean      exceptions_in_RAM;     /* TRUE if in RAM */

#if defined(ppc403)

  unsigned32   serial_per_sec;        /* Serial clocks per second */

  boolean      serial_external_clock;

  boolean      serial_xon_xoff;

  boolean      serial_cts_rts;

  unsigned32   serial_rate;

  unsigned32   timer_average_overhead; /* in ticks */

  unsigned32   timer_least_valid;   /* Least valid number from timer */

#endif

@};

@end example

@table @code

@item pretasking_hook

is the address of the user provided routine which is invoked

once RTEMS APIs are initialized.  This routine will be invoked

before any system tasks are created.  Interrupts are disabled.

This field may be NULL to indicate that the hook is not utilized.

@item predriver_hook

is the address of the user provided

routine that is invoked immediately before the

the device drivers and MPCI are initialized. RTEMS

initialization is complete but interrupts and tasking are disabled.

This field may be NULL to indicate that the hook is not utilized.

@item postdriver_hook

is the address of the user provided

routine that is invoked immediately after the

the device drivers and MPCI are initialized. RTEMS

initialization is complete but interrupts and tasking are disabled.

This field may be NULL to indicate that the hook is not utilized.

@item idle_task

is the address of the optional user

provided routine which is used as the system's IDLE task.  If

this field is not NULL, then the RTEMS default IDLE task is not

used.  This field may be NULL to indicate that the default IDLE

is to be used.

@item do_zero_of_workspace

indicates whether RTEMS should

zero the Workspace as part of its initialization.  If set to

TRUE, the Workspace is zeroed.  Otherwise, it is not.

@item idle_task_stack_size

is the size of the RTEMS idle task stack in bytes.

If this number is less than MINIMUM_STACK_SIZE, then the

idle task's stack will be MINIMUM_STACK_SIZE in byte.

@item interrupt_stack_size

is the size of the RTEMS allocated interrupt stack in bytes.

This value must be at least as large as MINIMUM_STACK_SIZE.

@item extra_mpci_receive_server_stack

is the extra stack space allocated for the RTEMS MPCI receive server task

in bytes.  The MPCI receive server may invoke nearly all directives and

may require extra stack space on some targets.

@item stack_allocate_hook

is the address of the optional user provided routine which allocates

memory for task stacks.  If this hook is not NULL, then a stack_free_hook

must be provided as well.

@item stack_free_hook

is the address of the optional user provided routine which frees

memory for task stacks.  If this hook is not NULL, then a stack_allocate_hook

must be provided as well.

@item clicks_per_usec

is the number of decrementer interupts that occur each microsecond.

@item spurious_handler

is the address of the

routine which is invoked when a spurious interrupt occurs.

@item exceptions_in_RAM

indicates whether the exception vectors are located in RAM or ROM.  If

they are located in RAM dynamic vector installation occurs, otherwise

it does not.

@item serial_per_sec

is a PPC403 specific field which specifies the number of clock

ticks per second for the PPC403 serial timer.

@item serial_rate

is a PPC403 specific field which specifies the baud rate for the

PPC403 serial port.

@item serial_external_clock

is a PPC403 specific field which indicates whether or not to mask in a 0x2 into

the Input/Output Configuration Register (IOCR) during initialization of the

PPC403 console.  (NOTE: This bit is defined as "reserved" 6-12?)

@item serial_xon_xoff

is a PPC403 specific field which indicates whether or not

XON/XOFF flow control is supported for the PPC403 serial port.

@item serial_cts_rts

is a PPC403 specific field which indicates whether or not to set the

least significant bit of the Input/Output Configuration Register

(IOCR) during initialization of the PPC403 console.  (NOTE: This

bit is defined as "reserved" 6-12?)

@item timer_average_overhead

is a PPC403 specific field which specifies the average number of overhead ticks that occur on the PPC403 timer.

@item timer_least_valid

is a PPC403 specific field which specifies the maximum valid PPC403 timer value.

@end table