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[/] [openrisc/] [trunk/] [or1ksim/] [peripheral/] [fields.h] - Blame information for rev 228

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1 19 jeremybenn
/* fields.h -- Some macros to help with bit field definitions
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   Copyright (C) 2001 by Erez Volk, erez@opencores.org
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   Copyright (C) 2008 Embecosm Limited
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   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
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   This program is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by the Free
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   Software Foundation; either version 3 of the License, or (at your option)
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   any later version.
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   This program 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 for
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   more details.
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   You should have received a copy of the GNU General Public License along
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   with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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/* This program is commented throughout in a fashion suitable for processing
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   with Doxygen. */
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#ifndef FIELDS__H
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#define FIELDS__H
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/* Macros to get/set a field in a register
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 * Example:
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 *  unsigned long done, priority, channel_csr;
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 *
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 *  priority = GET_FIELD( channel_csr, DMA_CH_CSR, PRIORITY );
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 *  SET_FIELD( channel_csr, DMA_CH_CSR, PRIORITY, priority );
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 *
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 *  done = TEST_FLAG( channel_csr, DMA_CH_CSR, DONE );
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 *  SET_FLAG( channel_csr, DMA_CH_CSR, DONE );
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 *  CLEAR_FLAG( channel_csr, DMA_CH_CSR, DONE );
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 *  ASSIGN_FLAG( channel_csr, DMA_CH_CSR, done );
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 *
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 * For each field, we then define e.g.
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 * #define DMA_CH_CSR_PRIORITY_OFFSET  13
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 * #define DMA_CH_CSR_PRIORITY_WIDTH   3 // not needed for flags, which always have width = 1
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 */
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#define FLAG_SHIFT(reg_name,flag_name)  (reg_name##_##flag_name##_OFFSET)
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#define FLAG_MASK(reg_name,flag_name)   (1LU << reg_name##_##flag_name##_OFFSET)
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#define TEST_FLAG(reg_value,reg_name,flag_name) (((reg_value ) >> reg_name##_##flag_name##_OFFSET) & 1LU)
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#define SET_FLAG(reg_value,reg_name,flag_name) { (reg_value) |= 1LU << reg_name##_##flag_name##_OFFSET; }
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#define CLEAR_FLAG(reg_value,reg_name,flag_name) { (reg_value) &= ~(1LU << reg_name##_##flag_name##_OFFSET); }
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#define ASSIGN_FLAG(reg_value,reg_name,flag_name,flag_value) { \
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    (reg_value) = flag_value ? ((reg_value) | (1LU << reg_name##_##flag_name##_OFFSET)) : ((reg_value) & ~(1LU << reg_name##_##flag_name##_OFFSET)); }
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#define FIELD_SHIFT(reg_name,field_name) (reg_name##_##field_name##_OFFSET)
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#define FIELD_MASK(reg_name,field_name) ((~(~0LU << reg_name##_##field_name##_WIDTH)) << reg_name##_##field_name##_OFFSET)
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#define GET_FIELD(reg_value,reg_name,field_name) (((reg_value) >> reg_name##_##field_name##_OFFSET) & (~(~0LU << reg_name##_##field_name##_WIDTH)))
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#define SET_FIELD(reg_value,reg_name,field_name,field_value) { \
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    (reg_value) = ((reg_value) & ~((~(~0LU << reg_name##_##field_name##_WIDTH)) << reg_name##_##field_name##_OFFSET)) | ((field_value) << reg_name##_##field_name##_OFFSET); }
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#endif /* FIELDS__H */

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