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Kernel: Use DMA helper everywhere

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Port UCHI, AC97, SB16, BMIDEChannel and AHCIPort to use the helper to
allocate DMA buffers.
This commit is contained in:
Pankaj Raghav 2022-01-06 22:01:05 +05:30 • committed by Andreas Kling
parent 59da9bd0bd
commit 0a1b34c753
5 changed files with 13 additions and 33 deletions
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7
Kernel/Devices/Audio/SB16.cpp
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@ -252,12 +252,7 @@ void SB16::wait_for_irq()
ErrorOr<size_t> SB16::write(OpenFileDescription&, u64, UserOrKernelBuffer const& data, size_t length)
{
if (!m_dma_region) {
auto page = MM.allocate_supervisor_physical_page();
if (!page)
return ENOMEM;
auto nonnull_page = page.release_nonnull();
auto vmobject = TRY(Memory::AnonymousVMObject::try_create_with_physical_pages({ &nonnull_page, 1 }));
m_dma_region = TRY(MM.allocate_kernel_region_with_vmobject(move(vmobject), PAGE_SIZE, "SB16 DMA buffer", Memory::Region::Access::Write));
m_dma_region = TRY(MM.allocate_dma_buffer_page("SB16 DMA buffer", Memory::Region::Access::Write));
}
dbgln_if(SB16_DEBUG, "SB16: Writing buffer of {} bytes", length);