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2008-06-13 Joel Sherrill <joel.sherrill@oarcorp.com>

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* sapi/include/confdefs.h, score/include/rtems/score/priority.h: Add
	CONFIGURE_IDLE_TASK_INITIALIZES_APPLICATION and
	CONFIGURE_MAXIMUM_PRIORITY.
This commit is contained in:
Joel Sherrill
2008-06-13 22:13:12 +00:00
parent 1603ecd4b4
commit 80f9d7763a
3 changed files with 102 additions and 11 deletions
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6
cpukit/ChangeLog
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@@ -1,3 +1,9 @@
2008-06-13 Joel Sherrill <joel.sherrill@oarcorp.com>
* sapi/include/confdefs.h, score/include/rtems/score/priority.h: Add
CONFIGURE_IDLE_TASK_INITIALIZES_APPLICATION and
CONFIGURE_MAXIMUM_PRIORITY.
2008-06-13 Joel Sherrill <joel.sherrill@oarcorp.com>
* posix/include/rtems/posix/pthread.h, posix/src/pthread.c,

93
cpukit/sapi/include/confdefs.h
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@@ -185,6 +185,47 @@ extern rtems_configuration_table Configuration;
#define CONFIGURE_STACK_CHECKER_EXTENSION 0
#endif
/**
* @brief Maximum Priority configuration
*
* This configures the maximum priority value that
* a task may have.
*
* By reducing the number of priorities in a system,
* the amount of RAM required by RTEMS can be significantly
* reduced. RTEMS allocates a Chain_Control structure per
* priority and this structure contains 3 pointers. So
* the default is (256 * 12) = 3K on 32-bit architectures.
*
* This must be one less than a power of 2 between
* 4 and 256. Valid values along with the application
* priority levels and memory saved when pointers are
* 32-bits in size are:
*
* + 3, 2 application priorities, 3024 bytes saved
* + 7, 5 application priorities, 2976 bytes saved
* + 15, 13 application priorities, 2880 bytes saved
* + 31, 29 application priorities, 2688 bytes saved
* + 63, 61 application priorities, 2304 bytes saved
* + 127, 125 application priorities, 1536 bytes saved
* + 255, 253 application priorities, 0 bytes saved
*
* It is specified in terms of Classic API
* priority values.
*/
#ifndef CONFIGURE_MAXIMUM_PRIORITY
#define CONFIGURE_MAXIMUM_PRIORITY 255
#endif
/*
* If you said the IDLE task was going to do application initialization
* and didn't override the IDLE body, then something is amiss.
*/
#if (defined(CONFIGURE_IDLE_TASK_INITIALIZES_APPLICATION) && \
!defined(CONFIGURE_IDLE_TASK_BODY))
#error "CONFIGURE_ERROR: You did not override the IDLE task body.
#endif
/**
* @brief Idle task body configuration
*
@@ -1309,7 +1350,7 @@ extern rtems_configuration_table Configuration;
CONFIGURE_MEMORY_FOR_TASKS(1, 0) + /* IDLE and stack */ \
(CONFIGURE_IDLE_TASK_STACK_SIZE - CONFIGURE_MINIMUM_TASK_STACK_SIZE) + \
_Configure_From_workspace( /* Ready chains */ \
((PRIORITY_MAXIMUM+1) * sizeof(Chain_Control)) ) + \
((CONFIGURE_MAXIMUM_PRIORITY+1) * sizeof(Chain_Control)) ) + \
CONFIGURE_INTERRUPT_VECTOR_TABLE + /* interrupt vectors */ \
CONFIGURE_INTERRUPT_STACK_MEMORY + /* interrupt stack */ \
CONFIGURE_API_MUTEX_MEMORY /* allocation mutex */ \
@@ -1519,6 +1560,17 @@ extern rtems_configuration_table Configuration;
uint32_t rtems_minimum_stack_size =
CONFIGURE_MINIMUM_TASK_STACK_SIZE;
/** This variable specifies the maximum priority value that
* a task may have. This must be a power of 2 between 4
* and 256 and is specified in terms of Classic API
* priority values.
*
* @note This is left as a simple uint8_t so it can be externed as
* needed without requring being high enough logical to
* include the full configuration table.
*/
uint8_t rtems_maximum_priority = CONFIGURE_MAXIMUM_PRIORITY;
/**
* This is the primary Configuration Table for this application.
*/
@@ -1618,13 +1670,20 @@ extern rtems_configuration_table Configuration;
*/
/*
* Make sure a task/thread of some sort is configured
* Make sure a task/thread of some sort is configured.
*
* When analyzing RTEMS to find the smallest possible of memory
* that must be allocated, you probably do want to configure 0
* tasks/threads so there is a smaller set of calls to _Workspace_Allocate
* to analyze.
*/
#if (CONFIGURE_MAXIMUM_TASKS == 0) && \
(CONFIGURE_MAXIMUM_POSIX_THREADS == 0) && \
(CONFIGURE_MAXIMUM_ADA_TASKS == 0) && \
(CONFIGURE_MAXIMUM_ITRON_TASKS == 0)
#error "CONFIGURATION ERROR: No tasks or threads configured!!"
#if !defined(CONFIGURE_IDLE_TASK_INITIALIZES_APPLICATION)
#if (CONFIGURE_MAXIMUM_TASKS == 0) && \
(CONFIGURE_MAXIMUM_POSIX_THREADS == 0) && \
(CONFIGURE_MAXIMUM_ADA_TASKS == 0) && \
(CONFIGURE_MAXIMUM_ITRON_TASKS == 0)
#error "CONFIGURATION ERROR: No tasks or threads configured!!"
#endif
#endif
/*
@@ -1633,7 +1692,8 @@ extern rtems_configuration_table Configuration;
*/
#if !defined(CONFIGURE_RTEMS_INIT_TASKS_TABLE) && \
!defined(CONFIGURE_POSIX_INIT_THREAD_TABLE) && \
!defined(CONFIGURE_ITRON_INIT_TASK_TABLE)
!defined(CONFIGURE_ITRON_INIT_TASK_TABLE) && \
!defined(CONFIGURE_IDLE_TASK_INITIALIZES_APPLICATION)
#error "CONFIGURATION ERROR: No initialization tasks or threads configured!!"
#endif
@@ -1714,5 +1774,22 @@ extern rtems_configuration_table Configuration;
#error "CONFIGURATION ERROR: CONFIGURE_TEST_XXX constants are obsolete"
#endif
/*
* Validate the configured maximum priority
*/
#if ((CONFIGURE_MAXIMUM_PRIORITY != 3) && \
(CONFIGURE_MAXIMUM_PRIORITY != 7) && \
(CONFIGURE_MAXIMUM_PRIORITY != 15) && \
(CONFIGURE_MAXIMUM_PRIORITY != 31) && \
(CONFIGURE_MAXIMUM_PRIORITY != 63) && \
(CONFIGURE_MAXIMUM_PRIORITY != 127) && \
(CONFIGURE_MAXIMUM_PRIORITY != 255))
#error "Maximum priority is not 1 less than a power of 2 between 4 and 256"
#endif
#if (CONFIGURE_MAXIMUM_PRIORITY > PRIORITY_DEFAULT_MAXIMUM)
#error "Maximum priority configured higher than supported by target."
#endif
#endif
/* end of include file */

14
cpukit/score/include/rtems/score/priority.h
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@@ -60,13 +60,16 @@ typedef uint32_t Priority_Control;
#define PRIORITY_MINIMUM 0
#endif
/** This defines the lowest (least important) thread priority. */
/** This defines the default lowest (least important) thread priority. */
#if defined (CPU_PRIORITY_MAXIMUM)
#define PRIORITY_MAXIMUM CPU_PRIORITY_MAXIMUM
#define PRIORITY_DEFAULT_MAXIMUM CPU_PRIORITY_MAXIMUM
#else
#define PRIORITY_MAXIMUM 255
#define PRIORITY_DEFAULT_MAXIMUM 255
#endif
/** This defines the lowest (least important) thread priority. */
#define PRIORITY_MAXIMUM rtems_maximum_priority
/**
* The following record defines the information associated with
* each thread to manage its interaction with the priority bit maps.
@@ -84,6 +87,11 @@ typedef struct {
Priority_Bit_map_control block_minor;
} Priority_Information;
/**
* This variable contains the configured number of priorities
*/
extern uint8_t rtems_maximum_priority;
/**
* Each sixteen bit entry in this array is associated with one of
* the sixteen entries in the Priority Bit map.