From e5efb02ff49e7a5a0083acc5f4b1af5fbb73b518 Mon Sep 17 00:00:00 2001 From: Amlal Date: Sun, 27 Apr 2025 13:12:12 +0200 Subject: dev, kernel: AHCI support and HeFS improvements, alongside scheduler allocation tree fix. Signed-off-by: Amlal --- dev/kernel/StorageKit/DMA.h | 58 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 dev/kernel/StorageKit/DMA.h (limited to 'dev/kernel/StorageKit') diff --git a/dev/kernel/StorageKit/DMA.h b/dev/kernel/StorageKit/DMA.h new file mode 100644 index 00000000..953683eb --- /dev/null +++ b/dev/kernel/StorageKit/DMA.h @@ -0,0 +1,58 @@ +/* + * Copyright (c) 2025 Amlal El Mahrouss. All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#pragma once + +#include +#include + +#ifdef __NE_AMD64__ +#define DMA_POOL_START (0x1000000) +#define DMA_POOL_SIZE (0x1000000) + +namespace Kernel { +inline UInt8* kDmaPoolPtr = (UInt8*) DMA_POOL_START; + +inline VoidPtr rtl_dma_alloc(SizeT size, SizeT align) { + UIntPtr addr = (UIntPtr) kDmaPoolPtr; + + addr = (addr + (align - 1)) & ~(align - 1); // Align up + + if (addr + size >= DMA_POOL_START + DMA_POOL_SIZE) { + kout << "DMA Pool exhausted!\r"; + + return nullptr; + } + + kDmaPoolPtr = (UInt8*) (addr + size); + return (VoidPtr) addr; +} + +inline Void rtl_dma_flush(Void* ptr, SizeT size_buffer) { + for (SizeT i = 0; i < size_buffer; ++i) { + asm volatile("clflush (%0)" : : "r"((UInt8*) ptr + i) : "memory"); + } + asm volatile("mfence" ::: "memory"); +} +} // namespace Kernel +#else +#endif \ No newline at end of file -- cgit v1.2.3