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/* Copyright 2019 SiFive, Inc */
/* SPDX-License-Identifier: Apache-2.0 */
#ifndef METAL__PRIVILEGE_H
#define METAL__PRIVILEGE_H
/*!
* @file metal/privilege.h
*
* @brief API for manipulating the privilege mode of a RISC-V system
*
* Additional information about privilege modes on RISC-V systems can be found
* by reading the RISC-V Privileged Architecture Specification v1.10.
*/
#include <stdint.h>
enum metal_privilege_mode {
METAL_PRIVILEGE_USER = 0,
METAL_PRIVILEGE_SUPERVISOR = 1,
METAL_PRIVELEGE_MACHINE = 3,
};
#if __riscv_xlen == 32
typedef uint32_t metal_xreg_t;
#elif __riscv_xlen == 64
typedef uint64_t metal_xreg_t;
#endif
#if __riscv_flen == 32
typedef uint32_t metal_freg_t;
#elif __riscv_flen == 64
typedef uint64_t metal_freg_t;
#endif
struct metal_register_file {
metal_xreg_t ra;
metal_xreg_t sp;
metal_xreg_t gp;
metal_xreg_t tp;
metal_xreg_t t0;
metal_xreg_t t1;
metal_xreg_t t2;
metal_xreg_t s0;
metal_xreg_t s1;
metal_xreg_t a0;
metal_xreg_t a1;
metal_xreg_t a2;
metal_xreg_t a3;
metal_xreg_t a4;
metal_xreg_t a5;
#ifndef __riscv_32e
metal_xreg_t a6;
metal_xreg_t a7;
metal_xreg_t s2;
metal_xreg_t s3;
metal_xreg_t s4;
metal_xreg_t s5;
metal_xreg_t s6;
metal_xreg_t s7;
metal_xreg_t s8;
metal_xreg_t s9;
metal_xreg_t s10;
metal_xreg_t s11;
metal_xreg_t t3;
metal_xreg_t t4;
metal_xreg_t t5;
metal_xreg_t t6;
#endif /* __riscv_32e */
#ifdef __riscv_flen
metal_freg_t ft0;
metal_freg_t ft1;
metal_freg_t ft2;
metal_freg_t ft3;
metal_freg_t ft4;
metal_freg_t ft5;
metal_freg_t ft6;
metal_freg_t ft7;
metal_freg_t fs0;
metal_freg_t fs1;
metal_freg_t fa0;
metal_freg_t fa1;
metal_freg_t fa2;
metal_freg_t fa3;
metal_freg_t fa4;
metal_freg_t fa5;
metal_freg_t fa6;
metal_freg_t fa7;
metal_freg_t fs2;
metal_freg_t fs3;
metal_freg_t fs4;
metal_freg_t fs5;
metal_freg_t fs6;
metal_freg_t fs7;
metal_freg_t fs8;
metal_freg_t fs9;
metal_freg_t fs10;
metal_freg_t fs11;
metal_freg_t ft8;
metal_freg_t ft9;
metal_freg_t ft10;
metal_freg_t ft11;
#endif /* __riscv_flen */
};
typedef void (*metal_privilege_entry_point_t)();
void metal_privilege_drop_to_mode(enum metal_privilege_mode mode,
struct metal_register_file regfile,
metal_privilege_entry_point_t entry_point);
#endif
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