1*1b191cb5SApple OSS Distributions<h2>vm_machine_attribute</h2> 2*1b191cb5SApple OSS Distributions<hr> 3*1b191cb5SApple OSS Distributions<p> 4*1b191cb5SApple OSS Distributions<strong>Function</strong> - Get/set the target memory region's special attributes. 5*1b191cb5SApple OSS Distributions<h3>SYNOPSIS</h3> 6*1b191cb5SApple OSS Distributions<pre> 7*1b191cb5SApple OSS Distributions<strong>kern_return_t vm_machine_attribute</strong> 8*1b191cb5SApple OSS Distributions <strong>(vm_task_t</strong> <var>target_task</var>, 9*1b191cb5SApple OSS Distributions <strong>vm_address_t</strong> <var>address</var>, 10*1b191cb5SApple OSS Distributions <strong>vm_size_t</strong> <var>size</var>, 11*1b191cb5SApple OSS Distributions <strong>vm_machine_attribute_t</strong> <var>attribute</var>, 12*1b191cb5SApple OSS Distributions <strong>vm_machine_attribute_val_t</strong> <var>value</var><strong>);</strong> 13*1b191cb5SApple OSS Distributions</pre> 14*1b191cb5SApple OSS Distributions<h3>PARAMETERS</h3> 15*1b191cb5SApple OSS Distributions<dl> 16*1b191cb5SApple OSS Distributions<p> 17*1b191cb5SApple OSS Distributions<dt> <var>target_task</var> 18*1b191cb5SApple OSS Distributions<dd> 19*1b191cb5SApple OSS Distributions[in task send right] 20*1b191cb5SApple OSS DistributionsThe port for the task in whose address space the 21*1b191cb5SApple OSS Distributionsmemory object is to be manipulated. 22*1b191cb5SApple OSS Distributions<p> 23*1b191cb5SApple OSS Distributions<dt> <var>address</var> 24*1b191cb5SApple OSS Distributions<dd> 25*1b191cb5SApple OSS Distributions[in scalar] 26*1b191cb5SApple OSS DistributionsThe starting address for the memory region. The granularity 27*1b191cb5SApple OSS Distributionsof rounding of this value to page boundaries is implementation 28*1b191cb5SApple OSS Distributionsdependent. 29*1b191cb5SApple OSS Distributions<p> 30*1b191cb5SApple OSS Distributions<dt> <var>size</var> 31*1b191cb5SApple OSS Distributions<dd> 32*1b191cb5SApple OSS Distributions[in scalar] 33*1b191cb5SApple OSS DistributionsThe number of bytes in the region. The granularity of 34*1b191cb5SApple OSS Distributionsrounding of this value to page boundaries is implementation dependent. 35*1b191cb5SApple OSS Distributions<p> 36*1b191cb5SApple OSS Distributions<dt> <var>attribute</var> 37*1b191cb5SApple OSS Distributions<dd> 38*1b191cb5SApple OSS Distributions[in scalar] 39*1b191cb5SApple OSS DistributionsThe name of the attribute to be get/set. Possible values are: 40*1b191cb5SApple OSS Distributions<dl> 41*1b191cb5SApple OSS Distributions<p> 42*1b191cb5SApple OSS Distributions<dt> <strong>MATTR_CACHE</strong> 43*1b191cb5SApple OSS Distributions<dd> 44*1b191cb5SApple OSS DistributionsCachability. Aside from the generic values listed below, the 45*1b191cb5SApple OSS Distributionsfollowing special values are defined: 46*1b191cb5SApple OSS Distributions<dl> 47*1b191cb5SApple OSS Distributions<p> 48*1b191cb5SApple OSS Distributions<dt> <strong>MATTR_VAL_CACHE_FLUSH</strong> 49*1b191cb5SApple OSS Distributions<dd> 50*1b191cb5SApple OSS DistributionsFlush from all caches 51*1b191cb5SApple OSS Distributions<p> 52*1b191cb5SApple OSS Distributions<dt> <strong>MATTR_VAL_DCACHE_FLUSH</strong> 53*1b191cb5SApple OSS Distributions<dd> 54*1b191cb5SApple OSS DistributionsFlush from data caches 55*1b191cb5SApple OSS Distributions<p> 56*1b191cb5SApple OSS Distributions<dt> <strong>MATTR_VAL_ICACHE_FLUSH</strong> 57*1b191cb5SApple OSS Distributions<dd> 58*1b191cb5SApple OSS DistributionsFlush from instruction caches 59*1b191cb5SApple OSS Distributions</dl> 60*1b191cb5SApple OSS Distributions<p> 61*1b191cb5SApple OSS Distributions<dt> <strong>MATTR_MIGRATE</strong> 62*1b191cb5SApple OSS Distributions<dd> 63*1b191cb5SApple OSS DistributionsMigratability. 64*1b191cb5SApple OSS Distributions<p> 65*1b191cb5SApple OSS Distributions<dt> <strong>MATTR_REPLICATE</strong> 66*1b191cb5SApple OSS Distributions<dd> 67*1b191cb5SApple OSS DistributionsReplicability. 68*1b191cb5SApple OSS Distributions</dl> 69*1b191cb5SApple OSS Distributions<p> 70*1b191cb5SApple OSS Distributions<dt> <var>value</var> 71*1b191cb5SApple OSS Distributions<dd> 72*1b191cb5SApple OSS Distributions[pointer to in/out scalar] 73*1b191cb5SApple OSS DistributionsThe new value for the attribute. The old value 74*1b191cb5SApple OSS Distributionsis also returned in this variable. The new value can be a specific value 75*1b191cb5SApple OSS Distributionslisted above, or one of the following generic values: 76*1b191cb5SApple OSS Distributions<dl> 77*1b191cb5SApple OSS Distributions<p> 78*1b191cb5SApple OSS Distributions<dt> <strong>MATTR_VAL_OFF</strong> 79*1b191cb5SApple OSS Distributions<dd> 80*1b191cb5SApple OSS DistributionsTurn attribute off. 81*1b191cb5SApple OSS Distributions<p> 82*1b191cb5SApple OSS Distributions<dt> <strong>MATTR_VAL_ON</strong> 83*1b191cb5SApple OSS Distributions<dd> 84*1b191cb5SApple OSS DistributionsTurn attribute on. 85*1b191cb5SApple OSS Distributions<p> 86*1b191cb5SApple OSS Distributions<dt> <strong>MATTR_VAL_GET</strong> 87*1b191cb5SApple OSS Distributions<dd> 88*1b191cb5SApple OSS DistributionsNo change, just return current value. 89*1b191cb5SApple OSS Distributions</dl> 90*1b191cb5SApple OSS Distributions</dl> 91*1b191cb5SApple OSS Distributions<h3>DESCRIPTION</h3> 92*1b191cb5SApple OSS Distributions<p> 93*1b191cb5SApple OSS DistributionsThe <strong>vm_machine_attribute</strong> function gets and sets special 94*1b191cb5SApple OSS Distributionsattributes of the 95*1b191cb5SApple OSS Distributionsmemory region implemented by the underlying <strong>pmap</strong> module. These attributes 96*1b191cb5SApple OSS Distributionsare properties such as cachability, migratability and replicability. 97*1b191cb5SApple OSS DistributionsThe behavior of this function is machine dependent. 98*1b191cb5SApple OSS Distributions<h3>NOTES</h3> 99*1b191cb5SApple OSS Distributions<p> 100*1b191cb5SApple OSS DistributionsThis interface is machine word length specific because of the virtual address 101*1b191cb5SApple OSS Distributionsparameter. 102*1b191cb5SApple OSS Distributions<h3>RETURN VALUES</h3> 103*1b191cb5SApple OSS Distributions<dl> 104*1b191cb5SApple OSS Distributions<p> 105*1b191cb5SApple OSS Distributions<dt> <strong>KERN_INVALID_ADDRESS</strong> 106*1b191cb5SApple OSS Distributions<dd> 107*1b191cb5SApple OSS DistributionsThe address is illegal or specifies a non-allocated region. 108*1b191cb5SApple OSS Distributions</dl> 109*1b191cb5SApple OSS Distributions<h3>RELATED INFORMATION</h3> 110*1b191cb5SApple OSS Distributions<p> 111*1b191cb5SApple OSS DistributionsFunctions: 112*1b191cb5SApple OSS Distributions<a href="vm_wire.html"><strong>vm_wire</strong></a>. 113