ARM Specific Information CPU Dependent Information Table
RTEMS CPU Architecture Supplement
1.7.1: CPU Dependent Information Table
The XXX version of the RTEMS CPU Dependent
Information Table contains the information required to interface
a Board Support Package and RTEMS on the XXX. 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 */
/* XXX CPU family dependent stuff */
} rtems_cpu_table;
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.
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.
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.
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.
RTEMS CPU Architecture Supplement