From 602b35aa62586f5d75ea329ebc29e49cdb470932 Mon Sep 17 00:00:00 2001 From: Pankaj Raghav Date: Thu, 16 Dec 2021 20:35:51 +0530 Subject: Kernel: Add DMA allocate functions that are TRY-able Add DMA allocate buffer helper functions in MemoryManager. --- Kernel/Memory/MemoryManager.cpp | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'Kernel/Memory/MemoryManager.cpp') diff --git a/Kernel/Memory/MemoryManager.cpp b/Kernel/Memory/MemoryManager.cpp index 4e1185e5cb..ae7950a9b2 100644 --- a/Kernel/Memory/MemoryManager.cpp +++ b/Kernel/Memory/MemoryManager.cpp @@ -733,6 +733,25 @@ ErrorOr> MemoryManager::allocate_contiguous_kernel_region( return allocate_kernel_region_with_vmobject(range, move(vmobject), name, access, cacheable); } +ErrorOr> MemoryManager::allocate_dma_buffer_page(StringView name, Memory::Region::Access access, RefPtr& dma_buffer_page) +{ + dma_buffer_page = allocate_supervisor_physical_page(); + if (dma_buffer_page.is_null()) + return ENOMEM; + auto region_or_error = allocate_kernel_region(dma_buffer_page->paddr(), PAGE_SIZE, name, access); + return region_or_error; +} + +ErrorOr> MemoryManager::allocate_dma_buffer_pages(size_t size, StringView name, Memory::Region::Access access, NonnullRefPtrVector& dma_buffer_pages) +{ + VERIFY(!(size % PAGE_SIZE)); + dma_buffer_pages = allocate_contiguous_supervisor_physical_pages(size); + if (dma_buffer_pages.is_empty()) + return ENOMEM; + auto region_or_error = allocate_kernel_region(dma_buffer_pages.first().paddr(), size, name, access); + return region_or_error; +} + ErrorOr> MemoryManager::allocate_kernel_region(size_t size, StringView name, Region::Access access, AllocationStrategy strategy, Region::Cacheable cacheable) { VERIFY(!(size % PAGE_SIZE)); -- cgit v1.2.3