special_insns.h

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/*
 *  Port on Texas Instruments TMS320C6x architecture
 *
 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
 *  Author: Aurelien Jacquiot ([email protected])
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */
#ifndef _ASM_C6X_SPECIAL_INSNS_H
#define _ASM_C6X_SPECIAL_INSNS_H


#define get_creg(reg) \
    ({ unsigned int __x; \
       asm volatile ("mvc .s2 " #reg ",%0\n" : "=b"(__x)); __x; })

#define set_creg(reg, v) \
    do { unsigned int __x = (unsigned int)(v); \
        asm volatile ("mvc .s2 %0," #reg "\n" : : "b"(__x)); \
    } while (0)

#define or_creg(reg, n) \
    do { unsigned __x, __n = (unsigned)(n);       \
        asm volatile ("mvc .s2 " #reg ",%0\n"     \
                  "or  .l2 %1,%0,%0\n"    \
                  "mvc .s2 %0," #reg "\n"     \
                  "nop\n"             \
                  : "=&b"(__x) : "b"(__n));   \
    } while (0)

#define and_creg(reg, n) \
    do { unsigned __x, __n = (unsigned)(n);       \
        asm volatile ("mvc .s2 " #reg ",%0\n"     \
                  "and .l2 %1,%0,%0\n"    \
                  "mvc .s2 %0," #reg "\n"     \
                  "nop\n"    \
                  : "=&b"(__x) : "b"(__n));   \
    } while (0)

#define get_coreid() (get_creg(DNUM) & 0xff)

/* Set/get IST */
#define set_ist(x)  set_creg(ISTP, x)
#define get_ist()       get_creg(ISTP)

/*
 * Exception management
 */
#define disable_exception()
#define get_except_type()        get_creg(EFR)
#define ack_exception(type)      set_creg(ECR, 1 << (type))
#define get_iexcept()            get_creg(IERR)
#define set_iexcept(mask)        set_creg(IERR, (mask))

#define _extu(x, s, e)                          \
    ({      unsigned int __x;                   \
        asm volatile ("extu .S2 %3,%1,%2,%0\n" :        \
                  "=b"(__x) : "n"(s), "n"(e), "b"(x));  \
           __x; })

#endif /* _ASM_C6X_SPECIAL_INSNS_H */