The PA-RISC version of the RTEMS CPU Dependent
Information Table contains the information required to interface
a Board Support Package and RTEMS on the PA-RISC. This
information is provided to allow RTEMS to interoperate
effectively with the BSP. The C structure definition is given
here:
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 */
hppa_rtems_isr_entry spurious_handler;
unsigned32 itimer_clicks_per_microsecond; /* for use by Clock driver */
} rtems_cpu_table;
pretasking_hook
is the address of the
user provided routine which is invoked once RTEMS initialization
is complete but before interrupts and tasking are enabled. This
field may be NULL to indicate that the hook is not utilized.
predriver_hook
is the address of the user provided
routine which is invoked with tasking enabled immediately before
the MPCI and device drivers are initialized. RTEMS
initialization is complete, interrupts and tasking are enabled,
but no device drivers are initialized. This field may be NULL to
indicate that the hook is not utilized.
postdriver_hook
is the address of the user provided
routine which is invoked with tasking enabled immediately after
the MPCI and device drivers are initialized. RTEMS
initialization is complete, interrupts and tasking are enabled,
and the device drivers are initialized. This field may be NULL
to indicate that the hook is not utilized.
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.
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.
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.
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.
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.
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.
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.
spurious_handler
is the address of the optional user provided routine which is invoked
when a spurious external interrupt occurs. A spurious interrupt is one
for which no handler is installed.
itimer_clicks_per_microsecond
is the number of countdowns in the on-CPU timer which corresponds
to a microsecond. This is a function of the clock speed of the CPU
being used.
RTEMS Hewlett Packard PA-RISC Applications Supplement