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

     /*-
      * Copyright (c) 2015 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_CPU_H_
    #define _MACHINE_CPU_H_
    
    #include <machine/atomic.h>
    #include <machine/frame.h>
    
    #define TRAPF_PC(tfp)           ((tfp)->tf_ra)
    #define TRAPF_USERMODE(tfp)     (((tfp)->tf_sepc & (1ul << 63)) == 0)
    
    #define cpu_getstack(td)        ((td)->td_frame->tf_sp)
    #define cpu_setstack(td, sp)    ((td)->td_frame->tf_sp = (sp))
    #define cpu_spinwait()          /* nothing */
    #define cpu_lock_delay()        DELAY(1)
    
    #ifdef _KERNEL
    
    /*
     * 0x0000         CPU ID unimplemented
     * 0x0001         UC Berkeley Rocket repo
     * 0x0002­0x7FFE  Reserved for open-source repos
     * 0x7FFF         Reserved for extension
     * 0x8000         Reserved for anonymous source
     * 0x8001­0xFFFE  Reserved for proprietary implementations
     * 0xFFFF         Reserved for extension
     */
    
    #define CPU_IMPL_SHIFT          0
    #define CPU_IMPL_MASK           (0xffff << CPU_IMPL_SHIFT)
    #define CPU_IMPL(mimpid)        ((mimpid & CPU_IMPL_MASK) >> CPU_IMPL_SHIFT)
    #define CPU_IMPL_UNIMPLEMEN     0x0
    #define CPU_IMPL_UCB_ROCKET     0x1
    
    #define CPU_PART_SHIFT          62
    #define CPU_PART_MASK           (0x3ul << CPU_PART_SHIFT)
    #define CPU_PART(mcpuid)        ((mcpuid & CPU_PART_MASK) >> CPU_PART_SHIFT)
    #define CPU_PART_RV32I          0x0
    #define CPU_PART_RV32E          0x1
    #define CPU_PART_RV64I          0x2
    #define CPU_PART_RV128I         0x3
    
    extern char btext[];
    extern char etext[];
    
    void    cpu_halt(void) __dead2;
    void    cpu_reset(void) __dead2;
    void    fork_trampoline(void);
    void    identify_cpu(void);
    void    swi_vm(void *v);
    
    static __inline uint64_t
    get_cyclecount(void)
    {
    
            /* TODO: This is bogus */
            return (1);
    }
    
    #endif
    
    #endif /* !_MACHINE_CPU_H_ */

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