cregit-Linux how code gets into the kernel

Release 4.14 arch/xtensa/include/asm/mxregs.h

/*
 * Xtensa MX interrupt distributor
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2008 - 2013 Tensilica Inc.
 */

#ifndef _XTENSA_MXREGS_H

#define _XTENSA_MXREGS_H

/*
 * RER/WER at, as       Read/write external register
 *      at: value
 *      as: address
 *
 * Address      Value
 * 00nn         0...0p..p       Interrupt Routing, route IRQ n to processor p
 * 01pp         0...0d..d       16 bits (d) 'ored' as single IPI to processor p
 * 0180         0...0m..m       Clear enable specified by mask (m)
 * 0184         0...0m..m       Set enable specified by mask (m)
 * 0190         0...0x..x       8-bit IPI partition register
 *                              VVVVVVVVPPPPUUUUUUUUUUUUUUUUU
 *                              V (10-bit) Release/Version
 *                              P ( 4-bit) Number of cores - 1
 *                              U (18-bit) ID
 * 01a0         i.......i       32-bit ConfigID
 * 0200         0...0m..m       RunStall core 'n'
 * 0220         c               Cache coherency enabled
 */


#define MIROUT(irq)	(0x000 + (irq))

#define MIPICAUSE(cpu)	(0x100 + (cpu))

#define MIPISET(cause)	(0x140 + (cause))

#define MIENG		0x180

#define MIENGSET	0x184

#define MIASG		0x188	
/* Read Global Assert Register */

#define MIASGSET	0x18c	
/* Set Global Addert Regiter */

#define MIPIPART	0x190

#define SYSCFGID	0x1a0

#define MPSCORE		0x200

#define CCON		0x220

#endif /* _XTENSA_MXREGS_H */

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