1*1031c584SApple OSS Distributions<h2>vm_machine_attribute</h2> 2*1031c584SApple OSS Distributions<hr> 3*1031c584SApple OSS Distributions<p> 4*1031c584SApple OSS Distributions<strong>Function</strong> - Get/set the target memory region's special attributes. 5*1031c584SApple OSS Distributions<h3>SYNOPSIS</h3> 6*1031c584SApple OSS Distributions<pre> 7*1031c584SApple OSS Distributions<strong>kern_return_t vm_machine_attribute</strong> 8*1031c584SApple OSS Distributions <strong>(vm_task_t</strong> <var>target_task</var>, 9*1031c584SApple OSS Distributions <strong>vm_address_t</strong> <var>address</var>, 10*1031c584SApple OSS Distributions <strong>vm_size_t</strong> <var>size</var>, 11*1031c584SApple OSS Distributions <strong>vm_machine_attribute_t</strong> <var>attribute</var>, 12*1031c584SApple OSS Distributions <strong>vm_machine_attribute_val_t</strong> <var>value</var><strong>);</strong> 13*1031c584SApple OSS Distributions</pre> 14*1031c584SApple OSS Distributions<h3>PARAMETERS</h3> 15*1031c584SApple OSS Distributions<dl> 16*1031c584SApple OSS Distributions<p> 17*1031c584SApple OSS Distributions<dt> <var>target_task</var> 18*1031c584SApple OSS Distributions<dd> 19*1031c584SApple OSS Distributions[in task send right] 20*1031c584SApple OSS DistributionsThe port for the task in whose address space the 21*1031c584SApple OSS Distributionsmemory object is to be manipulated. 22*1031c584SApple OSS Distributions<p> 23*1031c584SApple OSS Distributions<dt> <var>address</var> 24*1031c584SApple OSS Distributions<dd> 25*1031c584SApple OSS Distributions[in scalar] 26*1031c584SApple OSS DistributionsThe starting address for the memory region. The granularity 27*1031c584SApple OSS Distributionsof rounding of this value to page boundaries is implementation 28*1031c584SApple OSS Distributionsdependent. 29*1031c584SApple OSS Distributions<p> 30*1031c584SApple OSS Distributions<dt> <var>size</var> 31*1031c584SApple OSS Distributions<dd> 32*1031c584SApple OSS Distributions[in scalar] 33*1031c584SApple OSS DistributionsThe number of bytes in the region. The granularity of 34*1031c584SApple OSS Distributionsrounding of this value to page boundaries is implementation dependent. 35*1031c584SApple OSS Distributions<p> 36*1031c584SApple OSS Distributions<dt> <var>attribute</var> 37*1031c584SApple OSS Distributions<dd> 38*1031c584SApple OSS Distributions[in scalar] 39*1031c584SApple OSS DistributionsThe name of the attribute to be get/set. Possible values are: 40*1031c584SApple OSS Distributions<dl> 41*1031c584SApple OSS Distributions<p> 42*1031c584SApple OSS Distributions<dt> <strong>MATTR_CACHE</strong> 43*1031c584SApple OSS Distributions<dd> 44*1031c584SApple OSS DistributionsCachability. Aside from the generic values listed below, the 45*1031c584SApple OSS Distributionsfollowing special values are defined: 46*1031c584SApple OSS Distributions<dl> 47*1031c584SApple OSS Distributions<p> 48*1031c584SApple OSS Distributions<dt> <strong>MATTR_VAL_CACHE_FLUSH</strong> 49*1031c584SApple OSS Distributions<dd> 50*1031c584SApple OSS DistributionsFlush from all caches 51*1031c584SApple OSS Distributions<p> 52*1031c584SApple OSS Distributions<dt> <strong>MATTR_VAL_DCACHE_FLUSH</strong> 53*1031c584SApple OSS Distributions<dd> 54*1031c584SApple OSS DistributionsFlush from data caches 55*1031c584SApple OSS Distributions<p> 56*1031c584SApple OSS Distributions<dt> <strong>MATTR_VAL_ICACHE_FLUSH</strong> 57*1031c584SApple OSS Distributions<dd> 58*1031c584SApple OSS DistributionsFlush from instruction caches 59*1031c584SApple OSS Distributions</dl> 60*1031c584SApple OSS Distributions<p> 61*1031c584SApple OSS Distributions<dt> <strong>MATTR_MIGRATE</strong> 62*1031c584SApple OSS Distributions<dd> 63*1031c584SApple OSS DistributionsMigratability. 64*1031c584SApple OSS Distributions<p> 65*1031c584SApple OSS Distributions<dt> <strong>MATTR_REPLICATE</strong> 66*1031c584SApple OSS Distributions<dd> 67*1031c584SApple OSS DistributionsReplicability. 68*1031c584SApple OSS Distributions</dl> 69*1031c584SApple OSS Distributions<p> 70*1031c584SApple OSS Distributions<dt> <var>value</var> 71*1031c584SApple OSS Distributions<dd> 72*1031c584SApple OSS Distributions[pointer to in/out scalar] 73*1031c584SApple OSS DistributionsThe new value for the attribute. The old value 74*1031c584SApple OSS Distributionsis also returned in this variable. The new value can be a specific value 75*1031c584SApple OSS Distributionslisted above, or one of the following generic values: 76*1031c584SApple OSS Distributions<dl> 77*1031c584SApple OSS Distributions<p> 78*1031c584SApple OSS Distributions<dt> <strong>MATTR_VAL_OFF</strong> 79*1031c584SApple OSS Distributions<dd> 80*1031c584SApple OSS DistributionsTurn attribute off. 81*1031c584SApple OSS Distributions<p> 82*1031c584SApple OSS Distributions<dt> <strong>MATTR_VAL_ON</strong> 83*1031c584SApple OSS Distributions<dd> 84*1031c584SApple OSS DistributionsTurn attribute on. 85*1031c584SApple OSS Distributions<p> 86*1031c584SApple OSS Distributions<dt> <strong>MATTR_VAL_GET</strong> 87*1031c584SApple OSS Distributions<dd> 88*1031c584SApple OSS DistributionsNo change, just return current value. 89*1031c584SApple OSS Distributions</dl> 90*1031c584SApple OSS Distributions</dl> 91*1031c584SApple OSS Distributions<h3>DESCRIPTION</h3> 92*1031c584SApple OSS Distributions<p> 93*1031c584SApple OSS DistributionsThe <strong>vm_machine_attribute</strong> function gets and sets special 94*1031c584SApple OSS Distributionsattributes of the 95*1031c584SApple OSS Distributionsmemory region implemented by the underlying <strong>pmap</strong> module. These attributes 96*1031c584SApple OSS Distributionsare properties such as cachability, migratability and replicability. 97*1031c584SApple OSS DistributionsThe behavior of this function is machine dependent. 98*1031c584SApple OSS Distributions<h3>NOTES</h3> 99*1031c584SApple OSS Distributions<p> 100*1031c584SApple OSS DistributionsThis interface is machine word length specific because of the virtual address 101*1031c584SApple OSS Distributionsparameter. 102*1031c584SApple OSS Distributions<h3>RETURN VALUES</h3> 103*1031c584SApple OSS Distributions<dl> 104*1031c584SApple OSS Distributions<p> 105*1031c584SApple OSS Distributions<dt> <strong>KERN_INVALID_ADDRESS</strong> 106*1031c584SApple OSS Distributions<dd> 107*1031c584SApple OSS DistributionsThe address is illegal or specifies a non-allocated region. 108*1031c584SApple OSS Distributions</dl> 109*1031c584SApple OSS Distributions<h3>RELATED INFORMATION</h3> 110*1031c584SApple OSS Distributions<p> 111*1031c584SApple OSS DistributionsFunctions: 112*1031c584SApple OSS Distributions<a href="vm_wire.html"><strong>vm_wire</strong></a>. 113