The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
    3  * All rights reserved.
    4  *
    5  * Portions of this software were developed by SRI International and the
    6  * University of Cambridge Computer Laboratory under DARPA/AFRL contract
    7  * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
    8  *
    9  * Portions of this software were developed by the University of Cambridge
   10  * Computer Laboratory as part of the CTSRD Project, with support from the
   11  * UK Higher Education Innovation Fund (HEIF).
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  * $FreeBSD: releng/11.0/sys/riscv/include/cpu.h 292407 2015-12-17 18:44:30Z br $
   35  */
   36 
   37 #ifndef _MACHINE_CPU_H_
   38 #define _MACHINE_CPU_H_
   39 
   40 #include <machine/atomic.h>
   41 #include <machine/frame.h>
   42 
   43 #define TRAPF_PC(tfp)           ((tfp)->tf_ra)
   44 #define TRAPF_USERMODE(tfp)     (((tfp)->tf_sepc & (1ul << 63)) == 0)
   45 
   46 #define cpu_getstack(td)        ((td)->td_frame->tf_sp)
   47 #define cpu_setstack(td, sp)    ((td)->td_frame->tf_sp = (sp))
   48 #define cpu_spinwait()          /* nothing */
   49 
   50 #ifdef _KERNEL
   51 
   52 /*
   53  * 0x0000         CPU ID unimplemented
   54  * 0x0001         UC Berkeley Rocket repo
   55  * 0x0002­0x7FFE  Reserved for open-source repos
   56  * 0x7FFF         Reserved for extension
   57  * 0x8000         Reserved for anonymous source
   58  * 0x8001­0xFFFE  Reserved for proprietary implementations
   59  * 0xFFFF         Reserved for extension
   60  */
   61 
   62 #define CPU_IMPL_SHIFT          0
   63 #define CPU_IMPL_MASK           (0xffff << CPU_IMPL_SHIFT)
   64 #define CPU_IMPL(mimpid)        ((mimpid & CPU_IMPL_MASK) >> CPU_IMPL_SHIFT)
   65 #define CPU_IMPL_UNIMPLEMEN     0x0
   66 #define CPU_IMPL_UCB_ROCKET     0x1
   67 
   68 #define CPU_PART_SHIFT          62
   69 #define CPU_PART_MASK           (0x3ul << CPU_PART_SHIFT)
   70 #define CPU_PART(mcpuid)        ((mcpuid & CPU_PART_MASK) >> CPU_PART_SHIFT)
   71 #define CPU_PART_RV32I          0x0
   72 #define CPU_PART_RV32E          0x1
   73 #define CPU_PART_RV64I          0x2
   74 #define CPU_PART_RV128I         0x3
   75 
   76 extern char btext[];
   77 extern char etext[];
   78 
   79 void    cpu_halt(void) __dead2;
   80 void    cpu_reset(void) __dead2;
   81 void    fork_trampoline(void);
   82 void    identify_cpu(void);
   83 void    swi_vm(void *v);
   84 
   85 static __inline uint64_t
   86 get_cyclecount(void)
   87 {
   88 
   89         /* TODO: This is bogus */
   90         return (1);
   91 }
   92 
   93 #endif
   94 
   95 #endif /* !_MACHINE_CPU_H_ */

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