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• This comparison shows the changes necessary to convert path

  → /trunk/kernel/generic/src/mm/ @ 2169

  → /trunk/kernel/generic/src/mm/ @ 2170

  ↔ Reverse comparison

• Compare Path:	Rev

  With Path:	Rev

Ignore whitespace Rev 2169 → Rev 2170

/trunk/kernel/generic/src/mm/as.c
95,10 → 95,13
#endif
/**
* This lock protects inactive_as_with_asid_head list. It must be acquired
* before as_t mutex.
* This lock serializes access to the ASID subsystem.
* It protects:
* - inactive_as_with_asid_head list
* - as->asid for each as of the as_t type
* - asids_allocated counter
*/
SPINLOCK_INITIALIZE(inactive_as_with_asid_lock);
SPINLOCK_INITIALIZE(asidlock);
/**
* This list contains address spaces that are not active on any
205,14 → 208,15
* Since there is no reference to this area,
* it is safe not to lock its mutex.
*/
ipl = interrupts_disable();
spinlock_lock(&inactive_as_with_asid_lock);
spinlock_lock(&asidlock);
if (as->asid != ASID_INVALID && as != AS_KERNEL) {
if (as != AS && as->cpu_refcount == 0)
list_remove(&as->inactive_as_with_asid_link);
asid_put(as->asid);
}
spinlock_unlock(&inactive_as_with_asid_lock);
spinlock_unlock(&asidlock);
/*
* Destroy address space areas of the address space.
860,7 → 864,8
/** Switch address spaces.
*
* Note that this function cannot sleep as it is essentially a part of
* scheduling. Sleeping here would lead to deadlock on wakeup.
* scheduling. Sleeping here would lead to deadlock on wakeup. Another
* thing which is forbidden in this context is locking the address space.
*
* @param old Old address space or NULL.
* @param new New address space.
867,17 → 872,12
*/
void as_switch(as_t *old_as, as_t *new_as)
{
ipl_t ipl;
bool needs_asid = false;
ipl = interrupts_disable();
spinlock_lock(&inactive_as_with_asid_lock);
spinlock_lock(&asidlock);
/*
* First, take care of the old address space.
*/
if (old_as) {
mutex_lock_active(&old_as->lock);
ASSERT(old_as->cpu_refcount);
if((--old_as->cpu_refcount == 0) && (old_as != AS_KERNEL)) {
/*
890,7 → 890,6
list_append(&old_as->inactive_as_with_asid_link,
&inactive_as_with_asid_head);
}
mutex_unlock(&old_as->lock);
/*
* Perform architecture-specific tasks when the address space
902,36 → 901,15
/*
* Second, prepare the new address space.
*/
mutex_lock_active(&new_as->lock);
if ((new_as->cpu_refcount++ == 0) && (new_as != AS_KERNEL)) {
if (new_as->asid != ASID_INVALID) {
if (new_as->asid != ASID_INVALID)
list_remove(&new_as->inactive_as_with_asid_link);
} else {
/*
* Defer call to asid_get() until new_as->lock is released.
*/
needs_asid = true;
}
else
new_as->asid = asid_get();
}
#ifdef AS_PAGE_TABLE
SET_PTL0_ADDRESS(new_as->genarch.page_table);
#endif
mutex_unlock(&new_as->lock);
if (needs_asid) {
/*
* Allocation of new ASID was deferred
* until now in order to avoid deadlock.
*/
asid_t asid;
asid = asid_get();
mutex_lock_active(&new_as->lock);
new_as->asid = asid;
mutex_unlock(&new_as->lock);
}
spinlock_unlock(&inactive_as_with_asid_lock);
interrupts_restore(ipl);
/*
* Perform architecture-specific steps.
938,6 → 916,8
* (e.g. write ASID to hardware register etc.)
*/
as_install_arch(new_as);
spinlock_unlock(&asidlock);
AS = new_as;
}