SYSCOR eacro SYSCOR Macro Use the SYSCOR macro instruction to generate the internal control block
called the CORTABLE. The AP operand specifies whether will try
to make use of an attached processor.
The name field
instruction.
must not be specified for the SYSCOR macro
The format of the SYSCOR macro is: r I Name , Operation Operands I I SYSCOR [,FREE=ffff] t ',AP={YES}I I NO I L .J [TRACE=nnn]
L ReSIZE={XXXXXK} yye is the amount of real storage available for This value
limits the amount of real storage used by if it is less than
the total amount of real storage available in the real machine. If
the available real storage is less than this value when VM/370 is
initialized, a message indicating the amount of storage available
is displayed at the operator's console.
The value, xxxxx, is a 3-to 5-digit number that denotes the amount
of real storage in terms of K bytes, where lK=1024 bytes. This
value may range from 384K to 16384K. It must always be a multiple
of 2. The value, yy, is a 1-or 2-digit number that denotes the amount of
storage in terms of bytes, where bytes. This value may
range from to Do not specify a value substantially larger than the size of
real storage, because the generated core table uses a large amount
of real storage.
FREE=ffff
is a 1-to 4-digit number that specifies the number of fixed free
storage pages to be allocated at VM/370 initialization. This
number must be greater than 3; the amount of storage represented
must not be greater than 25% of the value specified for RMSIZE. The recommended value for ffff is one page for each virtual machine
that is logged on, based on the average number of virtual machine
users.
If the FREE operand is not specified, allocates three pages
for the first 256K of real storage and one page for each additional
64K thereafter, not including the V=R size, if any. In AP mode,
the default is increased by Part 2. Defining Your VM/370 System 173

SYS COR Macro YES specifies that processing is in attached processor mode if the
attached processor is available at system IPL. An additional free storage (see FREE=) in AP mode. NO specifies that processing is in uniprocessor mode regardless
of the presence of an attached processor.
TRACE=nnn
is the decimal number of 4K pages to be used for the trace table.
If the number of pages specified on the TRACE operand is not larger
than the default trace table size provided by the system (one page
for each 256K of real storage), the default size will be used for
the trace table. Exam'Ples: The first example defines real storage as' 256K (262,144 bytes) and the
second example defines real storage as 1M (1,048,576 bytes). SYSCOR SYSCOR RMSIZE=256K RMSIZE=lM 174 IBM VM/370 Planning and System Generation Guide