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Kernel: Add a specific-page variant of Region::commit()

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This commit is contained in:
Andreas Kling 2019-12-18 22:43:32 +01:00
parent c0e81b26b6
commit 1d4d6f16b2
2 changed files with 26 additions and 13 deletions
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36
Kernel/VM/Region.cpp
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@ -90,25 +90,37 @@ NonnullOwnPtr<Region> Region::clone()
return clone_region;
}
int Region::commit()
bool Region::commit()
{
InterruptDisabler disabler;
#ifdef MM_DEBUG
dbgprintf("MM: commit %u pages in Region %p (VMO=%p) at V%p\n", vmobject().page_count(), this, &vmobject(), vaddr().get());
#endif
for (size_t i = 0; i < page_count(); ++i) {
auto& vmobject_physical_page_entry = vmobject().physical_pages()[first_page_index() + i];
if (!vmobject_physical_page_entry.is_null())
continue;
auto physical_page = MM.allocate_user_physical_page(MemoryManager::ShouldZeroFill::Yes);
if (!physical_page) {
kprintf("MM: commit was unable to allocate a physical page\n");
return -ENOMEM;
}
vmobject_physical_page_entry = move(physical_page);
remap_page(i);
if (!commit(i))
return false;
}
return 0;
return true;
}
bool Region::commit(size_t page_index)
{
ASSERT(vmobject().is_anonymous() || vmobject().is_purgeable());
InterruptDisabler disabler;
#ifdef MM_DEBUG
dbgprintf("MM: commit single page (%zu) in Region %p (VMO=%p) at V%p\n", page_index, vmobject().page_count(), this, &vmobject(), vaddr().get());
#endif
auto& vmobject_physical_page_entry = vmobject().physical_pages()[first_page_index() + page_index];
if (!vmobject_physical_page_entry.is_null())
return true;
auto physical_page = MM.allocate_user_physical_page(MemoryManager::ShouldZeroFill::Yes);
if (!physical_page) {
kprintf("MM: commit was unable to allocate a physical page\n");
return false;
}
vmobject_physical_page_entry = move(physical_page);
remap_page(page_index);
return true;
}
u32 Region::cow_pages() const