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freebsd-dev/sys/riscv/include/riscvreg.h
Mitchell Horne cb8e067818 riscv: improve exception code naming 
The existing names were inherited from arm64, but we should prefer
RISC-V terminology. Change the prefix to SCAUSE, and further change the
names to better match the RISC-V spec and be more consistent with one
another. Also, remove two codes that are not defined for S-mode (machine
and hypervisor ecall).

While here, apply style(9) to some condition checks.

Reviewed by:	kp
Discussed with: jrtc27
Differential Revision:	https://reviews.freebsd.org/D26918
2020-10-24 20:57:13 +00:00

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/*-
* Copyright (c) 2015-2017 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_RISCVREG_H_
#define _MACHINE_RISCVREG_H_
#define SCAUSE_INTR (1ul << 63)
#define SCAUSE_CODE (~SCAUSE_INTR)
#define SCAUSE_INST_MISALIGNED 0
#define SCAUSE_INST_ACCESS_FAULT 1
#define SCAUSE_ILLEGAL_INSTRUCTION 2
#define SCAUSE_BREAKPOINT 3
#define SCAUSE_LOAD_MISALIGNED 4
#define SCAUSE_LOAD_ACCESS_FAULT 5
#define SCAUSE_STORE_MISALIGNED 6
#define SCAUSE_STORE_ACCESS_FAULT 7
#define SCAUSE_ECALL_USER 8
#define SCAUSE_ECALL_SUPERVISOR 9
#define SCAUSE_INST_PAGE_FAULT 12
#define SCAUSE_LOAD_PAGE_FAULT 13
#define SCAUSE_STORE_PAGE_FAULT 15
#define SSTATUS_UIE (1 << 0)
#define SSTATUS_SIE (1 << 1)
#define SSTATUS_UPIE (1 << 4)
#define SSTATUS_SPIE (1 << 5)
#define SSTATUS_SPIE_SHIFT 5
#define SSTATUS_SPP (1 << 8)
#define SSTATUS_SPP_SHIFT 8
#define SSTATUS_FS_SHIFT 13
#define SSTATUS_FS_OFF (0x0 << SSTATUS_FS_SHIFT)
#define SSTATUS_FS_INITIAL (0x1 << SSTATUS_FS_SHIFT)
#define SSTATUS_FS_CLEAN (0x2 << SSTATUS_FS_SHIFT)
#define SSTATUS_FS_DIRTY (0x3 << SSTATUS_FS_SHIFT)
#define SSTATUS_FS_MASK (0x3 << SSTATUS_FS_SHIFT)
#define SSTATUS_XS_SHIFT 15
#define SSTATUS_XS_MASK (0x3 << SSTATUS_XS_SHIFT)
#define SSTATUS_SUM (1 << 18)
#if __riscv_xlen == 64
#define SSTATUS_SD (1ul << 63)
#else
#define SSTATUS_SD (1 << 31)
#endif
#define MSTATUS_UIE (1 << 0)
#define MSTATUS_SIE (1 << 1)
#define MSTATUS_HIE (1 << 2)
#define MSTATUS_MIE (1 << 3)
#define MSTATUS_UPIE (1 << 4)
#define MSTATUS_SPIE (1 << 5)
#define MSTATUS_SPIE_SHIFT 5
#define MSTATUS_HPIE (1 << 6)
#define MSTATUS_MPIE (1 << 7)
#define MSTATUS_MPIE_SHIFT 7
#define MSTATUS_SPP (1 << 8)
#define MSTATUS_SPP_SHIFT 8
#define MSTATUS_HPP_MASK 0x3
#define MSTATUS_HPP_SHIFT 9
#define MSTATUS_MPP_MASK 0x3
#define MSTATUS_MPP_SHIFT 11
#define MSTATUS_FS_MASK 0x3
#define MSTATUS_FS_SHIFT 13
#define MSTATUS_XS_MASK 0x3
#define MSTATUS_XS_SHIFT 15
#define MSTATUS_MPRV (1 << 17)
#define MSTATUS_PUM (1 << 18)
#define MSTATUS_VM_MASK 0x1f
#define MSTATUS_VM_SHIFT 24
#define MSTATUS_VM_MBARE 0
#define MSTATUS_VM_MBB 1
#define MSTATUS_VM_MBBID 2
#define MSTATUS_VM_SV32 8
#define MSTATUS_VM_SV39 9
#define MSTATUS_VM_SV48 10
#define MSTATUS_VM_SV57 11
#define MSTATUS_VM_SV64 12
#if __riscv_xlen == 64
#define MSTATUS_SD (1ul << 63)
#else
#define MSTATUS_SD (1 << 31)
#endif
#define MSTATUS_PRV_U 0 /* user */
#define MSTATUS_PRV_S 1 /* supervisor */
#define MSTATUS_PRV_H 2 /* hypervisor */
#define MSTATUS_PRV_M 3 /* machine */
#define MIE_USIE (1 << 0)
#define MIE_SSIE (1 << 1)
#define MIE_HSIE (1 << 2)
#define MIE_MSIE (1 << 3)
#define MIE_UTIE (1 << 4)
#define MIE_STIE (1 << 5)
#define MIE_HTIE (1 << 6)
#define MIE_MTIE (1 << 7)
#define MIP_USIP (1 << 0)
#define MIP_SSIP (1 << 1)
#define MIP_HSIP (1 << 2)
#define MIP_MSIP (1 << 3)
#define MIP_UTIP (1 << 4)
#define MIP_STIP (1 << 5)
#define MIP_HTIP (1 << 6)
#define MIP_MTIP (1 << 7)
#define SIE_USIE (1 << 0)
#define SIE_SSIE (1 << 1)
#define SIE_UTIE (1 << 4)
#define SIE_STIE (1 << 5)
#define SIE_UEIE (1 << 8)
#define SIE_SEIE (1 << 9)
#define MIP_SEIP (1 << 9)
/* Note: sip register has no SIP_STIP bit in Spike simulator */
#define SIP_SSIP (1 << 1)
#define SIP_STIP (1 << 5)
#define SATP_PPN_S 0
#define SATP_PPN_M (0xfffffffffff << SATP_PPN_S)
#define SATP_ASID_S 44
#define SATP_ASID_M (0xffff << SATP_ASID_S)
#define SATP_MODE_S 60
#define SATP_MODE_M (0xf << SATP_MODE_S)
#define SATP_MODE_SV39 (8ULL << SATP_MODE_S)
#define SATP_MODE_SV48 (9ULL << SATP_MODE_S)
#define XLEN __riscv_xlen
#define XLEN_BYTES (XLEN / 8)
#define INSN_SIZE 4
#define INSN_C_SIZE 2
#define X_RA 1
#define X_SP 2
#define X_GP 3
#define X_TP 4
#define X_T0 5
#define X_T1 6
#define X_T2 7
#define X_T3 28
#define RD_SHIFT 7
#define RD_MASK (0x1f << RD_SHIFT)
#define RS1_SHIFT 15
#define RS1_MASK (0x1f << RS1_SHIFT)
#define RS1_SP (X_SP << RS1_SHIFT)
#define RS2_SHIFT 20
#define RS2_MASK (0x1f << RS2_SHIFT)
#define RS2_RA (X_RA << RS2_SHIFT)
#define IMM_SHIFT 20
#define IMM_MASK (0xfff << IMM_SHIFT)
#define RS2_C_SHIFT 2
#define RS2_C_MASK (0x1f << RS2_C_SHIFT)
#define RS2_C_RA (X_RA << RS2_C_SHIFT)
#define CSR_ZIMM(val) \
(__builtin_constant_p(val) && ((u_long)(val) < 32))
#define csr_swap(csr, val) \
({ if (CSR_ZIMM(val)) \
__asm __volatile("csrrwi %0, " #csr ", %1" \
: "=r" (val) : "i" (val)); \
else \
__asm __volatile("csrrw %0, " #csr ", %1" \
: "=r" (val) : "r" (val)); \
val; \
})
#define csr_write(csr, val) \
({ if (CSR_ZIMM(val)) \
__asm __volatile("csrwi " #csr ", %0" :: "i" (val)); \
else \
__asm __volatile("csrw " #csr ", %0" :: "r" (val)); \
})
#define csr_set(csr, val) \
({ if (CSR_ZIMM(val)) \
__asm __volatile("csrsi " #csr ", %0" :: "i" (val)); \
else \
__asm __volatile("csrs " #csr ", %0" :: "r" (val)); \
})
#define csr_clear(csr, val) \
({ if (CSR_ZIMM(val)) \
__asm __volatile("csrci " #csr ", %0" :: "i" (val)); \
else \
__asm __volatile("csrc " #csr ", %0" :: "r" (val)); \
})
#define csr_read(csr) \
({ u_long val; \
__asm __volatile("csrr %0, " #csr : "=r" (val)); \
val; \
})
#if __riscv_xlen == 32
#define csr_read64(csr) \
({ uint64_t val; \
uint32_t high, low; \
__asm __volatile("1: " \
"csrr t0, " #csr "h\n" \
"csrr %0, " #csr "\n" \
"csrr %1, " #csr "h\n" \
"bne t0, %1, 1b" \
: "=r" (low), "=r" (high) \
: \
: "t0"); \
val = (low | ((uint64_t)high << 32)); \
val; \
})
#else
#define csr_read64(csr) ((uint64_t)csr_read(csr))
#endif
#endif /* !_MACHINE_RISCVREG_H_ */
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