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Add simplified mmap() and munmap() syscalls.

This commit is contained in:
Andreas Kling 2018-10-24 09:48:24 +02:00
parent a5caf7ca99
commit 9a296d63f3
13 changed files with 116 additions and 2 deletions

View file

@ -120,6 +120,49 @@ Task::Region* Task::allocateRegion(size_t size, String&& name)
return m_regions.last().ptr();
}
bool Task::deallocateRegion(Region& region)
{
for (size_t i = 0; i < m_regions.size(); ++i) {
if (m_regions[i].ptr() == &region) {
// FIXME: This seems racy.
MemoryManager::the().unmapRegion(*this, region);
m_regions.remove(i);
return true;
}
}
return false;
}
Task::Region* Task::regionFromRange(LinearAddress laddr, size_t size)
{
for (auto& region : m_regions) {
if (region->linearAddress == laddr && region->size == size)
return region.ptr();
}
return nullptr;
}
void* Task::sys$mmap(void* addr, size_t size)
{
// FIXME: Implement mapping at a client-preferred address.
ASSERT(addr == nullptr);
auto* region = allocateRegion(size, "mmap");
if (!region)
return (void*)-1;
MemoryManager::the().mapRegion(*this, *region);
return (void*)region->linearAddress.get();
}
int Task::sys$munmap(void* addr, size_t size)
{
auto* region = regionFromRange(LinearAddress((dword)addr), size);
if (!region)
return -1;
if (!deallocateRegion(*region))
return -1;
return 0;
}
int Task::sys$spawn(const char* path)
{
auto* child = Task::create(path, m_uid, m_gid);