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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 <HALKit/AMD64/Processor.h>
#include <KernelKit/DebugOutput.h>
#ifdef __NE_AMD64__
#define kNeDMAPoolStart (0x1000000)
#define kNeDMAPoolSize (0x1000000)
namespace Kernel {
/// @brief DMA pool base pointer, here we're sure that AHCI or whatever tricky standard sees it.
inline UInt8* kDmaPoolPtr = (UInt8*) kNeDMAPoolStart;
inline const UInt8* kDmaPoolEnd = (UInt8*) (kNeDMAPoolStart + kNeDMAPoolSize);
/***********************************************************************************/
/// @brief allocate from the rtl_dma_alloc system.
/// @param size the size of the chunk to allocate.
/// @param align alignement of pointer.
/***********************************************************************************/
inline VoidPtr rtl_dma_alloc(SizeT size, SizeT align) {
if (!size) {
return nullptr;
}
UIntPtr addr = (UIntPtr) kDmaPoolPtr;
/// here we just align the address according to a `align` variable, i'd rather be a power of two
/// really.
addr = (addr + (align - 1)) & ~(align - 1);
if ((addr + size) >= reinterpret_cast<UIntPtr>(kDmaPoolEnd)) {
kout << "DMA Pool is exhausted!\r";
err_global_get() = kErrorDmaExhausted;
return nullptr;
}
kDmaPoolPtr = (UInt8*) (addr + size);
return (VoidPtr) addr;
}
/***********************************************************************************/
/// @brief Free DMA pointer.
/***********************************************************************************/
inline Void rtl_dma_free(SizeT size) {
if (!size) return;
kDmaPoolPtr = (UInt8*) (kDmaPoolPtr - size);
}
/***********************************************************************************/
/// @brief Flush DMA pointer.
/***********************************************************************************/
inline Void rtl_dma_flush(VoidPtr ptr, SizeT size_buffer) {
if (ptr > kDmaPoolEnd) {
return;
}
if (!ptr || ptr < (UInt8*) kNeDMAPoolStart) {
return;
}
for (SizeT buf_idx = 0UL; buf_idx < size_buffer; ++buf_idx) {
HAL::mm_memory_fence((VoidPtr) ((UInt8*) ptr + buf_idx));
}
}
} // namespace Kernel
#endif
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