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bcmpropertytags.cpp
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bcmpropertytags.cpp
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//
// bcmpropertytags.cpp
//
// Circle - A C++ bare metal environment for Raspberry Pi
// Copyright (C) 2014-2019 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/bcmpropertytags.h>
#include <circle/util.h>
#include <circle/synchronize.h>
#include <circle/bcm2835.h>
#include <circle/memory.h>
#include <circle/macros.h>
#include <assert.h>
struct TPropertyBuffer
{
u32 nBufferSize; // bytes
u32 nCode;
#define CODE_REQUEST 0x00000000
#define CODE_RESPONSE_SUCCESS 0x80000000
#define CODE_RESPONSE_FAILURE 0x80000001
u8 Tags[0];
// end tag follows
}
PACKED;
CBcmPropertyTags::CBcmPropertyTags (boolean bEarlyUse)
: m_MailBox (BCM_MAILBOX_PROP_OUT, bEarlyUse)
{
}
CBcmPropertyTags::~CBcmPropertyTags (void)
{
}
boolean CBcmPropertyTags::GetTag (u32 nTagId, void *pTag, unsigned nTagSize, unsigned nRequestParmSize)
{
assert (pTag != 0);
assert (nTagSize >= sizeof (TPropertyTagSimple));
TPropertyTag *pHeader = (TPropertyTag *) pTag;
pHeader->nTagId = nTagId;
pHeader->nValueBufSize = nTagSize - sizeof (TPropertyTag);
pHeader->nValueLength = nRequestParmSize & ~VALUE_LENGTH_RESPONSE;
if (!GetTags (pTag, nTagSize))
{
return FALSE;
}
pHeader->nValueLength &= ~VALUE_LENGTH_RESPONSE;
if (pHeader->nValueLength == 0)
{
return FALSE;
}
return TRUE;
}
boolean CBcmPropertyTags::GetTags (void *pTags, unsigned nTagsSize)
{
assert (pTags != 0);
assert (nTagsSize >= sizeof (TPropertyTagSimple));
unsigned nBufferSize = sizeof (TPropertyBuffer) + nTagsSize + sizeof (u32);
assert ((nBufferSize & 3) == 0);
TPropertyBuffer *pBuffer =
(TPropertyBuffer *) CMemorySystem::GetCoherentPage (COHERENT_SLOT_PROP_MAILBOX);
pBuffer->nBufferSize = nBufferSize;
pBuffer->nCode = CODE_REQUEST;
memcpy (pBuffer->Tags, pTags, nTagsSize);
u32 *pEndTag = (u32 *) (pBuffer->Tags + nTagsSize);
*pEndTag = PROPTAG_END;
DataSyncBarrier ();
u32 nBufferAddress = BUS_ADDRESS ((uintptr) pBuffer);
if (m_MailBox.WriteRead (nBufferAddress) != nBufferAddress)
{
return FALSE;
}
DataMemBarrier ();
if (pBuffer->nCode != CODE_RESPONSE_SUCCESS)
{
return FALSE;
}
memcpy (pTags, pBuffer->Tags, nTagsSize);
return TRUE;
}