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/*
* 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 <KernelKit/DebugOutput.h>
#include <NewKit/Defines.h>
#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) {
if (!size) {
return nullptr;
}
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_free(SizeT size) {
if (!size)
return;
kDmaPoolPtr = (UInt8*) (kDmaPoolPtr - size);
}
inline Void rtl_dma_flush(Void* ptr, SizeT size_buffer) {
if (ptr > (Void*)(DMA_POOL_START + DMA_POOL_SIZE))
{
return;
}
for (SizeT i = 0; i < size_buffer; ++i) {
asm volatile("clflush (%0)" : : "r"((UInt8*) ptr + i) : "memory");
}
asm volatile("mfence" ::: "memory");
}
} // namespace Kernel
#endif
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