/*
* Routine: macx_triggers
* Function:
* Syscall interface to set the call backs for low and
* high water marks.
*/
int
macx_triggers(
struct macx_triggers_args *args)
{
int hi_water = args->hi_water;
int low_water = args->low_water;
int flags = args->flags;
mach_port_t trigger_name = args->alert_port;
kern_return_t kr;
memory_object_default_t default_pager;
ipc_port_t trigger_port;
default_pager = MEMORY_OBJECT_DEFAULT_NULL;
kr = host_default_memory_manager(host_priv_self(),
&default_pager, 0);
if(kr != KERN_SUCCESS) {
return EINVAL;
}
if ((flags & SWAP_ENCRYPT_ON) &&
(flags & SWAP_ENCRYPT_OFF)) {
/* can't have it both ways */
return EINVAL;
}
if (default_pager_init_flag == 0) {
start_def_pager(NULL);
default_pager_init_flag = 1;
}
if (flags & SWAP_ENCRYPT_ON) {
/* ENCRYPTED SWAP: tell default_pager to encrypt */
default_pager_triggers(default_pager,
0, 0,
SWAP_ENCRYPT_ON,
IP_NULL);
} else if (flags & SWAP_ENCRYPT_OFF) {
/* ENCRYPTED SWAP: tell default_pager not to encrypt */
default_pager_triggers(default_pager,
0, 0,
SWAP_ENCRYPT_OFF,
IP_NULL);
}
if (flags & HI_WAT_ALERT) {
trigger_port = trigger_name_to_port(trigger_name);
if(trigger_port == NULL) {
return EINVAL;
}
/* trigger_port is locked and active */
ipc_port_make_send_locked(trigger_port);
/* now unlocked */
default_pager_triggers(default_pager,
hi_water, low_water,
HI_WAT_ALERT, trigger_port);
}
if (flags & LO_WAT_ALERT) {
trigger_port = trigger_name_to_port(trigger_name);
if(trigger_port == NULL) {
return EINVAL;
}
/* trigger_port is locked and active */
ipc_port_make_send_locked(trigger_port);
/* and now its unlocked */
default_pager_triggers(default_pager,
hi_water, low_water,
LO_WAT_ALERT, trigger_port);
}
/*
* Set thread scheduling priority and policy for the current thread
* it is assumed for the time being that the thread setting the alert
* is the same one which will be servicing it.
*
* XXX This does not belong in the kernel XXX
*/
{
thread_precedence_policy_data_t pre;
thread_extended_policy_data_t ext;
ext.timeshare = FALSE;
pre.importance = INT32_MAX;
thread_policy_set(current_thread(),
THREAD_EXTENDED_POLICY,
(thread_policy_t)&ext,
THREAD_EXTENDED_POLICY_COUNT);
thread_policy_set(current_thread(),
THREAD_PRECEDENCE_POLICY,
(thread_policy_t)&pre,
THREAD_PRECEDENCE_POLICY_COUNT);
}
current_thread()->options |= TH_OPT_VMPRIV;
return 0;
}
/*
* Routine: mach_macx_triggers
* Function:
* Syscall interface to set the call backs for low and
* high water marks.
*/
int
mach_macx_triggers(
struct macx_triggers_args *args)
{
int hi_water = args->hi_water;
int low_water = args->low_water;
int flags = args->flags;
mach_port_t trigger_name = args->alert_port;
kern_return_t kr;
memory_object_default_t default_pager;
ipc_port_t trigger_port;
default_pager = MEMORY_OBJECT_DEFAULT_NULL;
kr = host_default_memory_manager(host_priv_self(),
&default_pager, 0);
if(kr != KERN_SUCCESS) {
return EINVAL;
}
if (((flags & SWAP_ENCRYPT_ON) && (flags & SWAP_ENCRYPT_OFF)) ||
((flags & SWAP_COMPACT_ENABLE) && (flags & SWAP_COMPACT_DISABLE))) {
/* can't have it both ways */
return EINVAL;
}
if (default_pager_init_flag == 0) {
start_def_pager(NULL);
default_pager_init_flag = 1;
}
if (flags & SWAP_ENCRYPT_ON) {
/* ENCRYPTED SWAP: tell default_pager to encrypt */
default_pager_triggers(default_pager,
0, 0,
SWAP_ENCRYPT_ON,
IP_NULL);
} else if (flags & SWAP_ENCRYPT_OFF) {
/* ENCRYPTED SWAP: tell default_pager not to encrypt */
default_pager_triggers(default_pager,
0, 0,
SWAP_ENCRYPT_OFF,
IP_NULL);
}
if (flags & USE_EMERGENCY_SWAP_FILE_FIRST) {
/*
* Time to switch to the emergency segment.
*/
return default_pager_triggers(default_pager,
0, 0,
USE_EMERGENCY_SWAP_FILE_FIRST,
IP_NULL);
}
if (flags & SWAP_FILE_CREATION_ERROR) {
/*
* For some reason, the dynamic pager failed to create a swap file.
*/
trigger_port = trigger_name_to_port(trigger_name);
if(trigger_port == NULL) {
return EINVAL;
}
/* trigger_port is locked and active */
ipc_port_make_send_locked(trigger_port);
/* now unlocked */
default_pager_triggers(default_pager,
0, 0,
SWAP_FILE_CREATION_ERROR,
trigger_port);
}
if (flags & HI_WAT_ALERT) {
trigger_port = trigger_name_to_port(trigger_name);
if(trigger_port == NULL) {
return EINVAL;
}
/* trigger_port is locked and active */
ipc_port_make_send_locked(trigger_port);
/* now unlocked */
default_pager_triggers(default_pager,
hi_water, low_water,
HI_WAT_ALERT, trigger_port);
}
if (flags & LO_WAT_ALERT) {
trigger_port = trigger_name_to_port(trigger_name);
if(trigger_port == NULL) {
return EINVAL;
}
/* trigger_port is locked and active */
ipc_port_make_send_locked(trigger_port);
/* and now its unlocked */
default_pager_triggers(default_pager,
hi_water, low_water,
LO_WAT_ALERT, trigger_port);
}
if (flags & PROC_RESUME) {
/*
* For this call, hi_water is used to pass in the pid of the process we want to resume
* or unthrottle. This is of course restricted to the superuser (checked inside of
* proc_resetpcontrol).
*/
return proc_resetpcontrol(hi_water);
}
/*
* Set thread scheduling priority and policy for the current thread
* it is assumed for the time being that the thread setting the alert
* is the same one which will be servicing it.
*
* XXX This does not belong in the kernel XXX
*/
if (flags & HI_WAT_ALERT) {
thread_precedence_policy_data_t pre;
thread_extended_policy_data_t ext;
ext.timeshare = FALSE;
pre.importance = INT32_MAX;
thread_policy_set(current_thread(),
THREAD_EXTENDED_POLICY,
(thread_policy_t)&ext,
THREAD_EXTENDED_POLICY_COUNT);
thread_policy_set(current_thread(),
THREAD_PRECEDENCE_POLICY,
(thread_policy_t)&pre,
THREAD_PRECEDENCE_POLICY_COUNT);
current_thread()->options |= TH_OPT_VMPRIV;
}
if (flags & (SWAP_COMPACT_DISABLE | SWAP_COMPACT_ENABLE)) {
return macx_backing_store_compaction(flags & (SWAP_COMPACT_DISABLE | SWAP_COMPACT_ENABLE));
}
return 0;
}
