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#ifndef CYGONCE_HAL_VAR_INTR_H
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#define CYGONCE_HAL_VAR_INTR_H
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//=============================================================================
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//
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// var_intr.h
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//
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// Processor-specific interrupt support
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//
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//=============================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 2005 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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//=============================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): bartv
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// Date: 2005-06-26
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// Usage: #include <cyg/hal/hal_intr.h>
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//
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//####DESCRIPTIONEND####
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//
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//=============================================================================
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// The architectural HAL provides the bogomips rating. This is an
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// outer loop for the number of us and an inner loop for 1us. The
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// alignment of the inner loop can greatly affect performance. The
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// *16 of the bogomips rating seems to give about the right results
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// on a range of hardware.
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#define HAL_DELAY_US(_us_) \
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CYG_MACRO_START \
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asm volatile ( \
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"1:\n" \
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"movl %2,%1\n" \
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"sal $0x4,%1\n" \
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".align 16\n" \
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"2:\n" \
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"decl %1\n" \
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"jns 2b\n" \
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"decl %0\n" \
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"jns 1b\n" \
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: \
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: "r" (_us_), "r" (0), "g" (hal_bogomips+1) \
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: "cc"); \
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CYG_MACRO_END
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//--------------------------------------------------------------------------
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#endif // CYGONCE_HAL_VAR_INTR_H
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// End of var_intr.h
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