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- /*
- * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <AK/Checked.h>
- #include <AK/Try.h>
- #include <Kernel/API/POSIX/errno.h>
- #include <Kernel/Debug.h>
- #include <Kernel/Devices/DeviceManagement.h>
- #include <Kernel/Graphics/FramebufferDevice.h>
- #include <Kernel/Graphics/GraphicsManagement.h>
- #include <Kernel/Memory/AnonymousVMObject.h>
- #include <Kernel/Memory/MemoryManager.h>
- #include <Kernel/Process.h>
- #include <Kernel/Sections.h>
- #include <LibC/sys/ioctl_numbers.h>
- namespace Kernel {
- NonnullRefPtr<FramebufferDevice> FramebufferDevice::create(const GenericGraphicsAdapter& adapter, PhysicalAddress paddr, size_t width, size_t height, size_t pitch)
- {
- auto framebuffer_device_or_error = DeviceManagement::try_create_device<FramebufferDevice>(adapter, paddr, width, height, pitch);
- // FIXME: Find a way to propagate errors
- VERIFY(!framebuffer_device_or_error.is_error());
- return framebuffer_device_or_error.release_value();
- }
- ErrorOr<Memory::Region*> FramebufferDevice::mmap(Process& process, OpenFileDescription&, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
- {
- TRY(process.require_promise(Pledge::video));
- SpinlockLocker lock(m_activation_lock);
- if (!shared)
- return ENODEV;
- if (offset != 0)
- return ENXIO;
- auto framebuffer_length = TRY(buffer_length(0));
- framebuffer_length = TRY(Memory::page_round_up(framebuffer_length));
- if (range.size() != framebuffer_length)
- return EOVERFLOW;
- m_userspace_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, framebuffer_length));
- m_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, framebuffer_length));
- m_swapped_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_with_size(framebuffer_length, AllocationStrategy::AllocateNow));
- m_real_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_real_framebuffer_vmobject, framebuffer_length, "Framebuffer", Memory::Region::Access::ReadWrite));
- m_swapped_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_swapped_framebuffer_vmobject, framebuffer_length, "Framebuffer Swap (Blank)", Memory::Region::Access::ReadWrite));
- RefPtr<Memory::VMObject> chosen_vmobject;
- if (m_graphical_writes_enabled) {
- chosen_vmobject = m_real_framebuffer_vmobject;
- } else {
- chosen_vmobject = m_swapped_framebuffer_vmobject;
- }
- m_userspace_framebuffer_region = TRY(process.address_space().allocate_region_with_vmobject(
- range,
- chosen_vmobject.release_nonnull(),
- 0,
- "Framebuffer",
- prot,
- shared));
- if (auto result = m_userspace_framebuffer_region->set_write_combine(true); result.is_error())
- dbgln("FramebufferDevice: Failed to enable Write-Combine on Framebuffer: {}", result.error());
- return m_userspace_framebuffer_region;
- }
- void FramebufferDevice::deactivate_writes()
- {
- SpinlockLocker lock(m_activation_lock);
- if (!m_userspace_framebuffer_region)
- return;
- auto framebuffer_length_or_error = buffer_length(0);
- VERIFY(!framebuffer_length_or_error.is_error());
- size_t rounded_framebuffer_length = Memory::page_round_up(framebuffer_length_or_error.release_value()).release_value_but_fixme_should_propagate_errors();
- memcpy(m_swapped_framebuffer_region->vaddr().as_ptr(), m_real_framebuffer_region->vaddr().as_ptr(), rounded_framebuffer_length);
- auto vmobject = m_swapped_framebuffer_vmobject;
- m_userspace_framebuffer_region->set_vmobject(vmobject.release_nonnull());
- m_userspace_framebuffer_region->remap();
- m_graphical_writes_enabled = false;
- }
- void FramebufferDevice::activate_writes()
- {
- SpinlockLocker lock(m_activation_lock);
- if (!m_userspace_framebuffer_region || !m_real_framebuffer_vmobject)
- return;
- // restore the image we had in the void area
- // FIXME: if we happen to have multiple Framebuffers that are writing to that location
- // we will experience glitches...
- auto framebuffer_length_or_error = buffer_length(0);
- VERIFY(!framebuffer_length_or_error.is_error());
- size_t rounded_framebuffer_length = Memory::page_round_up(framebuffer_length_or_error.release_value()).release_value_but_fixme_should_propagate_errors();
- memcpy(m_real_framebuffer_region->vaddr().as_ptr(), m_swapped_framebuffer_region->vaddr().as_ptr(), rounded_framebuffer_length);
- auto vmobject = m_userspace_real_framebuffer_vmobject;
- m_userspace_framebuffer_region->set_vmobject(vmobject.release_nonnull());
- m_userspace_framebuffer_region->remap();
- m_graphical_writes_enabled = true;
- }
- UNMAP_AFTER_INIT ErrorOr<void> FramebufferDevice::try_to_initialize()
- {
- // FIXME: Would be nice to be able to unify this with mmap above, but this
- // function is UNMAP_AFTER_INIT for the time being.
- auto framebuffer_length = TRY(buffer_length(0));
- framebuffer_length = TRY(Memory::page_round_up(framebuffer_length));
- m_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, framebuffer_length));
- m_swapped_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_with_size(framebuffer_length, AllocationStrategy::AllocateNow));
- m_real_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_real_framebuffer_vmobject, framebuffer_length, "Framebuffer", Memory::Region::Access::ReadWrite));
- m_swapped_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_swapped_framebuffer_vmobject, framebuffer_length, "Framebuffer Swap (Blank)", Memory::Region::Access::ReadWrite));
- return {};
- }
- UNMAP_AFTER_INIT FramebufferDevice::FramebufferDevice(const GenericGraphicsAdapter& adapter, PhysicalAddress addr, size_t width, size_t height, size_t pitch)
- : GenericFramebufferDevice(adapter)
- , m_framebuffer_address(addr)
- , m_framebuffer_pitch(pitch)
- , m_framebuffer_width(width)
- , m_framebuffer_height(height)
- {
- VERIFY(!m_framebuffer_address.is_null());
- VERIFY(m_framebuffer_pitch);
- VERIFY(m_framebuffer_width);
- VERIFY(m_framebuffer_height);
- dbgln("Framebuffer {}: address={}, pitch={}, width={}, height={}", minor(), addr, pitch, width, height);
- }
- ErrorOr<size_t> FramebufferDevice::buffer_length(size_t head) const
- {
- // Note: This FramebufferDevice class doesn't support multihead setup.
- // We take care to verify this at the GenericFramebufferDevice::ioctl method
- // so if we happen to accidentally have a value different than 0, assert.
- VERIFY(head == 0);
- SpinlockLocker locker(m_resolution_lock);
- auto adapter = m_graphics_adapter.strong_ref();
- if (!adapter)
- return Error::from_errno(EIO);
- if (adapter->double_framebuffering_capable())
- return m_framebuffer_pitch * m_framebuffer_height * 2;
- return m_framebuffer_pitch * m_framebuffer_height;
- }
- ErrorOr<size_t> FramebufferDevice::pitch(size_t head) const
- {
- // Note: This FramebufferDevice class doesn't support multihead setup.
- // We take care to verify this at the GenericFramebufferDevice::ioctl method
- // so if we happen to accidentally have a value different than 0, assert.
- VERIFY(head == 0);
- SpinlockLocker locker(m_resolution_lock);
- return m_framebuffer_pitch;
- }
- ErrorOr<size_t> FramebufferDevice::height(size_t head) const
- {
- // Note: This FramebufferDevice class doesn't support multihead setup.
- // We take care to verify this at the GenericFramebufferDevice::ioctl method
- // so if we happen to accidentally have a value different than 0, assert.
- VERIFY(head == 0);
- SpinlockLocker locker(m_resolution_lock);
- return m_framebuffer_height;
- }
- ErrorOr<size_t> FramebufferDevice::width(size_t head) const
- {
- // Note: This FramebufferDevice class doesn't support multihead setup.
- // We take care to verify this at the GenericFramebufferDevice::ioctl method
- // so if we happen to accidentally have a value different than 0, assert.
- VERIFY(head == 0);
- SpinlockLocker locker(m_resolution_lock);
- return m_framebuffer_width;
- }
- ErrorOr<size_t> FramebufferDevice::vertical_offset(size_t head) const
- {
- // Note: This FramebufferDevice class doesn't support multihead setup.
- // We take care to verify this at the GenericFramebufferDevice::ioctl method
- // so if we happen to accidentally have a value different than 0, assert.
- VERIFY(head == 0);
- SpinlockLocker locker(m_buffer_offset_lock);
- return m_y_offset;
- }
- ErrorOr<bool> FramebufferDevice::vertical_offsetted(size_t head) const
- {
- // Note: This FramebufferDevice class doesn't support multihead setup.
- // We take care to verify this at the GenericFramebufferDevice::ioctl method
- // so if we happen to accidentally have a value different than 0, assert.
- VERIFY(head == 0);
- SpinlockLocker locker(m_buffer_offset_lock);
- return m_y_offset == 0 ? 0 : 1;
- }
- ErrorOr<void> FramebufferDevice::set_head_resolution(size_t head, size_t width, size_t height, size_t)
- {
- // Note: This FramebufferDevice class doesn't support multihead setup.
- // We take care to verify this at the GenericFramebufferDevice::ioctl method
- // so if we happen to accidentally have a value different than 0, assert.
- VERIFY(head == 0);
- SpinlockLocker buffer_offset_locker(m_buffer_offset_lock);
- SpinlockLocker resolution_locker(m_resolution_lock);
- auto adapter = m_graphics_adapter.strong_ref();
- if (!adapter)
- return Error::from_errno(EIO);
- auto result = adapter->try_to_set_resolution(0, width, height);
- // FIXME: Find a better way to return here a ErrorOr<void>.
- if (!result)
- return Error::from_errno(ENOTSUP);
- m_framebuffer_width = width;
- m_framebuffer_height = height;
- m_framebuffer_pitch = width * sizeof(u32);
- return {};
- }
- ErrorOr<void> FramebufferDevice::set_head_buffer(size_t head, bool second_buffer)
- {
- // Note: This FramebufferDevice class doesn't support multihead setup.
- // We take care to verify this at the GenericFramebufferDevice::ioctl method
- // so if we happen to accidentally have a value different than 0, assert.
- VERIFY(head == 0);
- SpinlockLocker locker(m_buffer_offset_lock);
- auto adapter = m_graphics_adapter.strong_ref();
- if (!adapter)
- return Error::from_errno(EIO);
- if (second_buffer) {
- if (!adapter->set_y_offset(0, m_framebuffer_height)) {
- // FIXME: Find a better ErrorOr<void> here.
- return Error::from_errno(ENOTSUP);
- }
- m_y_offset = m_framebuffer_height;
- } else {
- if (!adapter->set_y_offset(0, 0)) {
- // FIXME: Find a better ErrorOr<void> here.
- return Error::from_errno(ENOTSUP);
- }
- m_y_offset = 0;
- }
- return {};
- }
- ErrorOr<void> FramebufferDevice::flush_head_buffer(size_t)
- {
- // Note: This FramebufferDevice class doesn't support flushing.
- // We take care to verify this at the GenericFramebufferDevice::ioctl method
- // so if we happen to accidentally reach this code, assert.
- VERIFY_NOT_REACHED();
- }
- ErrorOr<void> FramebufferDevice::flush_rectangle(size_t, FBRect const&)
- {
- // Note: This FramebufferDevice class doesn't support partial flushing.
- // We take care to verify this at the GenericFramebufferDevice::ioctl method
- // so if we happen to accidentally reach this code, assert.
- VERIFY_NOT_REACHED();
- }
- ErrorOr<ByteBuffer> FramebufferDevice::get_edid(size_t head) const
- {
- auto adapter = m_graphics_adapter.strong_ref();
- if (!adapter)
- return Error::from_errno(EIO);
- return adapter->get_edid(head);
- }
- }
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