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/* fields.h -- Some macros to help with bit field definitions Copyright (C) 2001 by Erez Volk, erez@opencores.org This file is part of OpenRISC 1000 Architectural Simulator. 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef __FIELDS_H #define __FIELDS_H /* Macros to get/set a field in a register * Example: * unsigned long done, priority, channel_csr; * * priority = GET_FIELD( channel_csr, DMA_CH_CSR, PRIORITY ); * SET_FIELD( channel_csr, DMA_CH_CSR, PRIORITY, priority ); * * done = TEST_FLAG( channel_csr, DMA_CH_CSR, DONE ); * SET_FLAG( channel_csr, DMA_CH_CSR, DONE ); * CLEAR_FLAG( channel_csr, DMA_CH_CSR, DONE ); * ASSIGN_FLAG( channel_csr, DMA_CH_CSR, done ); * * For each field, we then define e.g. * #define DMA_CH_CSR_PRIORITY_OFFSET 13 * #define DMA_CH_CSR_PRIORITY_WIDTH 3 // not needed for flags, which always have width = 1 */ #define FLAG_SHIFT(reg_name,flag_name) (reg_name##_##flag_name##_OFFSET) #define FLAG_MASK(reg_name,flag_name) (1LU << reg_name##_##flag_name##_OFFSET) #define TEST_FLAG(reg_value,reg_name,flag_name) (((reg_value ) >> reg_name##_##flag_name##_OFFSET) & 1LU) #define SET_FLAG(reg_value,reg_name,flag_name) { (reg_value) |= 1LU << reg_name##_##flag_name##_OFFSET; } #define CLEAR_FLAG(reg_value,reg_name,flag_name) { (reg_value) &= ~(1LU << reg_name##_##flag_name##_OFFSET); } #define ASSIGN_FLAG(reg_value,reg_name,flag_name,flag_value) { \ (reg_value) = flag_value ? ((reg_value) | (1LU << reg_name##_##flag_name##_OFFSET)) : ((reg_value) & ~(1LU << reg_name##_##flag_name##_OFFSET)); } #define FIELD_SHIFT(reg_name,field_name) (reg_name##_##field_name##_OFFSET) #define FIELD_MASK(reg_name,field_name) ((~(~0LU << reg_name##_##field_name##_WIDTH)) << reg_name##_##field_name##_OFFSET) #define GET_FIELD(reg_value,reg_name,field_name) (((reg_value) >> reg_name##_##field_name##_OFFSET) & (~(~0LU << reg_name##_##field_name##_WIDTH))) #define SET_FIELD(reg_value,reg_name,field_name,field_value) { \ (reg_value) = ((reg_value) & ~((~(~0LU << reg_name##_##field_name##_WIDTH)) << reg_name##_##field_name##_OFFSET)) | ((field_value) << reg_name##_##field_name##_OFFSET); } #endif /* __FIELDS_H */
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