83 lines
4.2 KiB
C
83 lines
4.2 KiB
C
/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2003 Altera Corporation, San Jose, California, USA. *
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* All rights reserved. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the "Software"), *
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* to deal in the Software without restriction, including without limitation *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
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* and/or sell copies of the Software, and to permit persons to whom the *
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* Software is furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in *
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* all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
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* DEALINGS IN THE SOFTWARE. *
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* *
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* This agreement shall be governed in all respects by the laws of the State *
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* of California and by the laws of the United States of America. *
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* *
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* Altera does not recommend, suggest or require that this reference design *
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* file be used in conjunction or combination with any other product. *
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******************************************************************************/
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#include "altera_avalon_sysid_qsys.h"
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#include "altera_avalon_sysid_qsys_regs.h"
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#include "alt_types.h"
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#include <io.h>
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/*
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* This component is special: there's only one of it.
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* Therefore we can dispense with a bunch of complexity
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* normally associated with components, such as specialized
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* structs containing parameter info, and instead use that
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* info by name directly out of system.h. A downside of this
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* approach is that each time the system is regenerated, and
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* system.h changes, this file must be recompiled. Fortunately
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* this file is, and is likely to remain, quite small.
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*/
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#include "system.h"
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#ifdef SYSID_BASE
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/*
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* return values:
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* 0 if the hardware and software appear to be in sync
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* 1 if software appears to be older than hardware
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* -1 if hardware appears to be older than software
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*/
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alt_32 alt_avalon_sysid_qsys_test(void)
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{
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/* Read the hardware-tag, aka value0, from the hardware. */
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alt_u32 hardware_id = IORD_ALTERA_AVALON_SYSID_QSYS_ID(SYSID_BASE);
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/* Read the time-of-generation, aka value1, from the hardware register. */
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alt_u32 hardware_timestamp = IORD_ALTERA_AVALON_SYSID_QSYS_TIMESTAMP(SYSID_BASE);
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/* Return 0 if the hardware and software appear to be in sync. */
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if ((SYSID_TIMESTAMP == hardware_timestamp) && (SYSID_ID == hardware_id))
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{
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return 0;
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}
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/*
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* Return 1 if software appears to be older than hardware (that is,
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* the value returned by the hardware is larger than that recorded by
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* the generator function).
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* If the hardware time happens to match the generator program's value
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* (but the hardware tag, value0, doesn't match or 0 would have been
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* returned above), return an arbitrary value, let's say -1.
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*/
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return ((alt_32)(hardware_timestamp - SYSID_TIMESTAMP)) > 0 ? 1 : -1;
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}
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#endif
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