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CXHCIDevice::FreeSharedMem() implemented
This is a prerequisite for implementing the possibility to remove and reconnect USB devices. class CXHCISharedMemAllocator added
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| // | ||
| // xhcisharedmemallocator.h | ||
| // | ||
| // Circle - A C++ bare metal environment for Raspberry Pi | ||
| // Copyright (C) 2020 R. Stange <rsta2@o2online.de> | ||
| // | ||
| // This program is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // This program is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| // | ||
| #ifndef _circle_usb_xhcisharedmemallocator_h | ||
| #define _circle_usb_xhcisharedmemallocator_h | ||
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| #include <circle/types.h> | ||
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| // Shared memory requirements of this xHCI driver: | ||
| // | ||
| // Size Align Boundary Count Object | ||
| // ---- ----- -------- -------------- ----------------------------------------------- | ||
| // 16 64 none 1 ERST | ||
| // 248 64 4K 1 Scatchpad Buffer Array | ||
| // 264 64 4K 1 DCBAA | ||
| // 1024 64 4K <=32 Device Context | ||
| // 1024 64 64K <=2+32*EPs TRB Ring (EPs = number of endpoints per device) | ||
| // 124K 4K 4K 1 Scatchpad Buffers | ||
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| // We only maintain blocks with the following specification. Other blocks, which do not | ||
| // fit these specification (blocks with smaller size/alignment/boundary requirements do | ||
| // fit), can be allocated, but are lost, if they are freed (should not happen). | ||
| #define XHCI_BLOCK_SIZE 1024 | ||
| #define XHCI_BLOCK_ALIGN 64 | ||
| #define XHCI_BLOCK_BOUNDARY 0x10000 | ||
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| struct TXHCIBlockHeader | ||
| { | ||
| u32 nMagic; | ||
| #define XHCI_BLOCK_MAGIC 0x58484349 | ||
| u32 nSize; | ||
| u32 nAlign; | ||
| u32 nBoundary; | ||
| TXHCIBlockHeader *pNext; | ||
| u8 Data[0]; | ||
| }; | ||
|
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| class CXHCISharedMemAllocator /// Shared memory allocation for the xHCI driver | ||
| { | ||
| public: | ||
| CXHCISharedMemAllocator (uintptr nMemStart, uintptr nMemEnd); | ||
| ~CXHCISharedMemAllocator (void); | ||
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| size_t GetFreeSpace (void) const; | ||
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| void *Allocate (size_t nSize, size_t nAlign, size_t nBoundary); | ||
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| void Free (void *pBlock); | ||
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| private: | ||
| uintptr m_nMemStart; | ||
| uintptr m_nMemEnd; | ||
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| TXHCIBlockHeader *m_pFreeList; | ||
| }; | ||
|
|
||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| // | ||
| // xhcisharedmemallocator.cpp | ||
| // | ||
| // Circle - A C++ bare metal environment for Raspberry Pi | ||
| // Copyright (C) 2020 R. Stange <rsta2@o2online.de> | ||
| // | ||
| // This program is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // This program is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| // | ||
| #include <circle/usb/xhcisharedmemallocator.h> | ||
| #include <circle/logger.h> | ||
| #include <assert.h> | ||
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| static const char From[] = "xhcialloc"; | ||
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| CXHCISharedMemAllocator::CXHCISharedMemAllocator (uintptr nMemStart, uintptr nMemEnd) | ||
| : m_nMemStart (nMemStart), | ||
| m_nMemEnd (nMemEnd), | ||
| m_pFreeList (0) | ||
| { | ||
| assert (m_nMemStart != 0); | ||
| assert (m_nMemEnd > m_nMemStart); | ||
| } | ||
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| CXHCISharedMemAllocator::~CXHCISharedMemAllocator (void) | ||
| { | ||
| m_nMemStart = 0; | ||
| m_nMemEnd = 0; | ||
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| m_pFreeList = 0; | ||
| } | ||
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| size_t CXHCISharedMemAllocator::GetFreeSpace (void) const | ||
| { | ||
| return m_nMemEnd > m_nMemStart ? m_nMemEnd - m_nMemStart : 0; | ||
| } | ||
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| void *CXHCISharedMemAllocator::Allocate (size_t nSize, size_t nAlign, size_t nBoundary) | ||
| { | ||
| assert (nSize > 0); | ||
| assert (nAlign != 0); | ||
| assert (nAlign <= nBoundary); | ||
| assert (m_nMemStart != 0); | ||
| assert (m_nMemEnd != 0); | ||
|
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| if ( nSize <= XHCI_BLOCK_SIZE | ||
| && nAlign <= XHCI_BLOCK_ALIGN | ||
| && nBoundary <= XHCI_BLOCK_BOUNDARY) | ||
| { | ||
| if (m_pFreeList != 0) | ||
| { | ||
| TXHCIBlockHeader *pBlockHeader = m_pFreeList; | ||
| assert (pBlockHeader->nMagic == XHCI_BLOCK_MAGIC); | ||
| assert (pBlockHeader->nSize == XHCI_BLOCK_SIZE); | ||
| assert (pBlockHeader->nAlign == XHCI_BLOCK_ALIGN); | ||
| assert (pBlockHeader->nBoundary == XHCI_BLOCK_BOUNDARY); | ||
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| m_pFreeList = pBlockHeader->pNext; | ||
| pBlockHeader->pNext = 0; | ||
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| void *pResult = pBlockHeader->Data; | ||
| assert (((uintptr) pResult & (XHCI_BLOCK_ALIGN-1)) == 0); | ||
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| return pResult; | ||
| } | ||
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| nSize = XHCI_BLOCK_SIZE; | ||
| nAlign = XHCI_BLOCK_ALIGN; | ||
| nBoundary = XHCI_BLOCK_BOUNDARY; | ||
| } | ||
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| m_nMemStart += sizeof (TXHCIBlockHeader); | ||
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| size_t nAlignMask = nAlign - 1; | ||
| if (m_nMemStart & nAlignMask) | ||
| { | ||
| m_nMemStart += nAlignMask; | ||
| m_nMemStart &= ~nAlignMask; | ||
| } | ||
|
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| size_t nBoundaryMask = nBoundary - 1; | ||
| if ( (m_nMemStart & ~nBoundaryMask) | ||
| != ((m_nMemStart + nSize-1) & ~nBoundaryMask)) | ||
| { | ||
| m_nMemStart += nBoundaryMask; | ||
| m_nMemStart &= ~nBoundaryMask; | ||
| } | ||
|
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| TXHCIBlockHeader *pBlockHeader = | ||
| (TXHCIBlockHeader *) (m_nMemStart - sizeof (TXHCIBlockHeader)); | ||
|
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| m_nMemStart += nSize; | ||
|
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| if (m_nMemStart > m_nMemEnd) | ||
| { | ||
| return 0; | ||
| } | ||
|
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| pBlockHeader->nMagic = XHCI_BLOCK_MAGIC; | ||
| pBlockHeader->nSize = (u32) nSize; | ||
| pBlockHeader->nAlign = (u32) nAlign; | ||
| pBlockHeader->nBoundary = (u32) nBoundary; | ||
| pBlockHeader->pNext = 0; | ||
|
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| void *pResult = pBlockHeader->Data; | ||
| assert (((uintptr) pResult & (XHCI_BLOCK_ALIGN-1)) == 0); | ||
|
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| return pResult; | ||
| } | ||
|
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| void CXHCISharedMemAllocator::Free (void *pBlock) | ||
| { | ||
| assert (pBlock != 0); | ||
|
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| TXHCIBlockHeader *pBlockHeader = | ||
| (TXHCIBlockHeader *) ((uintptr) pBlock - sizeof (TXHCIBlockHeader)); | ||
| assert (pBlockHeader->nMagic == XHCI_BLOCK_MAGIC); | ||
|
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| if ( pBlockHeader->nSize == XHCI_BLOCK_SIZE | ||
| && pBlockHeader->nAlign == XHCI_BLOCK_ALIGN | ||
| && pBlockHeader->nBoundary == XHCI_BLOCK_BOUNDARY) | ||
| { | ||
| pBlockHeader->pNext = m_pFreeList; | ||
| m_pFreeList = pBlockHeader; | ||
| } | ||
| else | ||
| { | ||
| CLogger::Get ()->Write (From, LogWarning, | ||
| "Trying to free shared memory at 0x%lX (size %u, align %u)", | ||
| (uintptr) pBlock, pBlockHeader->nSize, pBlockHeader->nAlign); | ||
| } | ||
| } |