17.5.7 Fixed-sized memory pool information
The number of items that can be defined as fixed-sized memory pool information is limited to one for each ID number.
The following shows the fixed-sized memory pool information format.
CRE_MPF (mpfid, { mpfatr, blkcnt, blksz[:sec_nam], mpf });
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The items constituting the fixed-sized memory pool information are as follows.
Specifies the ID number for a fixed-sized memory pool.
A value from 0x1 to 0xff, or a name, can be specified for
mpfid.
Note When a name is specified, the CF850V4 automatically assigns an ID number.
The CF850V4 outputs the relationship between a name and an ID number to the system information header file in the following format:
#define mpfid value
Specifies the task queuing method for a fixed-sized memory pool.
The keyword that can be specified for
mpfatr is TA_TFIFO or TA_TPRI.
TA_TFIFO: Task wait queue is in FIFO order.
TA_TPRI: Task wait queue is in task priority order.
Specifies the block count for a fixed-sized memory pool.
A value from 0x1 to 0x7fff can be specified for
blkcnt.
4 ) Basic block size:
blksz, memory area name:
sec_nam
Specifies the size per block (unit: bytes) and the name of the memory area secured for the fixed-size memory pool.
Only 4-byte boundary values from 0x1 to 0x7ffffffc can be specified for
blksz, and only memory area name
sec_area defined in
Memory area information" can be specified for
sec_nam.
Note If specification of
sec_nam is omitted, the fixed-sized memory pool is allocated to ".kernel_work" section.
5 ) Reserved for future use:
mpf
System-reserved area.
Values that can be specified for
mpl are limited to NULL characters.