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: stable/11/sys/riscv/include/cpu.h 340270 2018-11-08 22:42:55Z jhb $
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#define	cpu_lock_delay()	DELAY(1)
50
51#ifdef _KERNEL
52
53/*
54 * 0x0000         CPU ID unimplemented
55 * 0x0001         UC Berkeley Rocket repo
56 * 0x0002��0x7FFE  Reserved for open-source repos
57 * 0x7FFF         Reserved for extension
58 * 0x8000         Reserved for anonymous source
59 * 0x8001��0xFFFE  Reserved for proprietary implementations
60 * 0xFFFF         Reserved for extension
61 */
62
63#define	CPU_IMPL_SHIFT		0
64#define	CPU_IMPL_MASK		(0xffff << CPU_IMPL_SHIFT)
65#define	CPU_IMPL(mimpid)	((mimpid & CPU_IMPL_MASK) >> CPU_IMPL_SHIFT)
66#define	CPU_IMPL_UNIMPLEMEN	0x0
67#define	CPU_IMPL_UCB_ROCKET	0x1
68
69#define	CPU_PART_SHIFT		62
70#define	CPU_PART_MASK		(0x3ul << CPU_PART_SHIFT)
71#define	CPU_PART(mcpuid)	((mcpuid & CPU_PART_MASK) >> CPU_PART_SHIFT)
72#define	CPU_PART_RV32I		0x0
73#define	CPU_PART_RV32E		0x1
74#define	CPU_PART_RV64I		0x2
75#define	CPU_PART_RV128I		0x3
76
77extern char btext[];
78extern char etext[];
79
80void	cpu_halt(void) __dead2;
81void	cpu_reset(void) __dead2;
82void	fork_trampoline(void);
83void	identify_cpu(void);
84void	swi_vm(void *v);
85
86static __inline uint64_t
87get_cyclecount(void)
88{
89
90	/* TODO: This is bogus */
91	return (1);
92}
93
94#endif
95
96#endif /* !_MACHINE_CPU_H_ */
97