FreeBSD/Linux Kernel Cross Reference
sys/riscv/include/cpufunc.h

     /*-
      * Copyright (c) 2015-2016 Ruslan Bukin <br@bsdpad.com>
      * All rights reserved.
      *
      * Portions of this software were developed by SRI International and the
      * University of Cambridge Computer Laboratory under DARPA/AFRL contract
      * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
      *
      * Portions of this software were developed by the University of Cambridge
     * Computer Laboratory as part of the CTSRD Project, with support from the
     * UK Higher Education Innovation Fund (HEIF).
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_CPUFUNC_H_
    #define _MACHINE_CPUFUNC_H_
    
    static __inline void
    breakpoint(void)
    {
    
            __asm("ebreak");
    }
    
    #ifdef _KERNEL
    
    #include <machine/riscvreg.h>
    
    static __inline register_t
    intr_disable(void)
    {
            uint64_t ret;
    
            __asm __volatile(
                    "csrrci %0, sstatus, %1"
                    : "=&r" (ret) : "i" (SSTATUS_SIE)
            );
    
            return (ret & (SSTATUS_SIE));
    }
    
    static __inline void
    intr_restore(register_t s)
    {
    
            __asm __volatile(
                    "csrs sstatus, %0"
                    :: "r" (s)
            );
    }
    
    static __inline void
    intr_enable(void)
    {
    
            __asm __volatile(
                    "csrsi sstatus, %0"
                    :: "i" (SSTATUS_SIE)
            );
    }
    
    /* NB: fence() is defined as a macro in <machine/atomic.h>. */
    
    static __inline void
    fence_i(void)
    {
    
            __asm __volatile("fence.i" ::: "memory");
    }
    
    static __inline void
    sfence_vma(void)
    {
    
            __asm __volatile("sfence.vma" ::: "memory");
    }
    
   static __inline void
   sfence_vma_page(uintptr_t addr)
   {
   
           __asm __volatile("sfence.vma %0" :: "r" (addr) : "memory");
   }
   
   #define rdcycle()                       csr_read64(cycle)
   #define rdtime()                        csr_read64(time)
   #define rdinstret()                     csr_read64(instret)
   #define rdhpmcounter(n)                 csr_read64(hpmcounter##n)
   
   extern int64_t dcache_line_size;
   extern int64_t icache_line_size;
   
   #define cpu_dcache_wbinv_range(a, s)
   #define cpu_dcache_inv_range(a, s)
   #define cpu_dcache_wb_range(a, s)
   
   #define cpu_idcache_wbinv_range(a, s)
   #define cpu_icache_sync_range(a, s)
   #define cpu_icache_sync_range_checked(a, s)
   
   #define cpufunc_nullop()                riscv_nullop()
   
   void riscv_nullop(void);
   
   #endif  /* _KERNEL */
   #endif  /* _MACHINE_CPUFUNC_H_ */

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