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Kernel: Make kernel region allocators return KResultOr<NOP<Region>>

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This expands the reach of error propagation greatly throughout the
kernel. Sadly, it also exposes the fact that we're allocating (and
doing other fallible things) in constructors all over the place.

This patch doesn't attempt to address that of course. That's work for
our future selves.
This commit is contained in:
Andreas Kling 2021-09-06 01:36:14 +02:00
parent cb71a73708
commit 75564b4a5f
40 changed files with 173 additions and 193 deletions
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5
Kernel/Bus/VirtIO/Queue.cpp
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@ -19,10 +19,9 @@ Queue::Queue(u16 queue_size, u16 notify_offset)
size_t size_of_device = sizeof(QueueDevice) + queue_size * sizeof(QueueDeviceItem);
auto queue_region_size = Memory::page_round_up(size_of_descriptors + size_of_driver + size_of_device);
if (queue_region_size <= PAGE_SIZE)
m_queue_region = MM.allocate_kernel_region(queue_region_size, "VirtIO Queue", Memory::Region::Access::ReadWrite);
m_queue_region = MM.allocate_kernel_region(queue_region_size, "VirtIO Queue", Memory::Region::Access::ReadWrite).release_value();
else
m_queue_region = MM.allocate_contiguous_kernel_region(queue_region_size, "VirtIO Queue", Memory::Region::Access::ReadWrite);
VERIFY(m_queue_region);
m_queue_region = MM.allocate_contiguous_kernel_region(queue_region_size, "VirtIO Queue", Memory::Region::Access::ReadWrite).release_value();
// TODO: ensure alignment!!!
u8* ptr = m_queue_region->vaddr().as_ptr();
memset(ptr, 0, m_queue_region->size());