neorv32_cpu.h

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// ================================================================================ //
// The NEORV32 RISC-V Processor - https://github.com/stnolting/neorv32              //
// Copyright (c) NEORV32 contributors.                                              //
// Copyright (c) 2020 - 2025 Stephan Nolting. All rights reserved.                  //
// Licensed under the BSD-3-Clause license, see LICENSE for details.                //
// SPDX-License-Identifier: BSD-3-Clause                                            //
// ================================================================================ //

 
#ifndef NEORV32_CPU_H
#define NEORV32_CPU_H
 
#include <stdint.h>
 
 
/**********************************************************************/
uint64_t neorv32_cpu_get_cycle(void);
void     neorv32_cpu_set_mcycle(uint64_t value);
uint64_t neorv32_cpu_get_instret(void);
void     neorv32_cpu_set_minstret(uint64_t value);
uint32_t neorv32_cpu_pmp_get_num_regions(void);
uint32_t neorv32_cpu_pmp_get_granularity(void);
int      neorv32_cpu_pmp_configure_region(int index, uint32_t addr, uint8_t config);
uint32_t neorv32_cpu_hpm_get_num_counters(void);
uint32_t neorv32_cpu_hpm_get_size(void);
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_soft_restart(void) {
 
  uint32_t sw_boot_addr = NEORV32_CRT0_ENTRY; // linker symbol
  asm volatile ("jalr x0, 0(%[dst])" : : [dst] "r" (sw_boot_addr));
  __builtin_unreachable();
  while(1); // should never be reached
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_store_unsigned_word(uint32_t addr, uint32_t wdata) {
 
  uint32_t reg_addr = addr;
  uint32_t reg_data = wdata;
  asm volatile ("sw %[da], 0(%[ad])" : : [da] "r" (reg_data), [ad] "r" (reg_addr));
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_store_unsigned_half(uint32_t addr, uint16_t wdata) {
 
  uint32_t reg_addr = addr;
  uint32_t reg_data = (uint32_t)wdata;
  asm volatile ("sh %[da], 0(%[ad])" : : [da] "r" (reg_data), [ad] "r" (reg_addr));
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_store_unsigned_byte(uint32_t addr, uint8_t wdata) {
 
  uint32_t reg_addr = addr;
  uint32_t reg_data = (uint32_t)wdata;
  asm volatile ("sb %[da], 0(%[ad])" : : [da] "r" (reg_data), [ad] "r" (reg_addr));
}
 
 
/**********************************************************************/
inline uint32_t __attribute__ ((always_inline)) neorv32_cpu_load_unsigned_word(uint32_t addr) {
 
  uint32_t reg_addr = addr;
  uint32_t reg_data;
  asm volatile ("lw %[da], 0(%[ad])" : [da] "=r" (reg_data) : [ad] "r" (reg_addr));
  return reg_data;
}
 
 
/**********************************************************************/
inline uint16_t __attribute__ ((always_inline)) neorv32_cpu_load_unsigned_half(uint32_t addr) {
 
  uint32_t reg_addr = addr;
  uint16_t reg_data;
  asm volatile ("lhu %[da], 0(%[ad])" : [da] "=r" (reg_data) : [ad] "r" (reg_addr));
  return reg_data;
}
 
 
/**********************************************************************/
inline int16_t __attribute__ ((always_inline)) neorv32_cpu_load_signed_half(uint32_t addr) {
 
  uint32_t reg_addr = addr;
  int16_t reg_data;
  asm volatile ("lh %[da], 0(%[ad])" : [da] "=r" (reg_data) : [ad] "r" (reg_addr));
  return reg_data;
}
 
 
/**********************************************************************/
inline uint8_t __attribute__ ((always_inline)) neorv32_cpu_load_unsigned_byte(uint32_t addr) {
 
  uint32_t reg_addr = addr;
  uint8_t reg_data;
  asm volatile ("lbu %[da], 0(%[ad])" : [da] "=r" (reg_data) : [ad] "r" (reg_addr));
  return reg_data;
}
 
 
/**********************************************************************/
inline int8_t __attribute__ ((always_inline)) neorv32_cpu_load_signed_byte(uint32_t addr) {
 
  uint32_t reg_addr = addr;
  int8_t reg_data;
  asm volatile ("lb %[da], 0(%[ad])" : [da] "=r" (reg_data) : [ad] "r" (reg_addr));
  return reg_data;
}
 
 
/**********************************************************************/
inline uint32_t __attribute__ ((always_inline)) neorv32_cpu_csr_read(const int csr_id) {
 
  uint32_t csr_data;
  asm volatile ("csrr %[dst], %[id]" : [dst] "=r" (csr_data) : [id] "i" (csr_id));
  return csr_data;
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_csr_write(const int csr_id, uint32_t data) {
 
  uint32_t csr_data = data;
  asm volatile ("csrw %[id], %[src]" :  : [id] "i" (csr_id), [src] "r" (csr_data));
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_csr_set(const int csr_id, uint32_t mask) {
 
  uint32_t csr_data = mask;
  asm volatile ("csrs %[id], %[src]" :  : [id] "i" (csr_id), [src] "r" (csr_data));
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_csr_clr(const int csr_id, uint32_t mask) {
 
  uint32_t csr_data = mask;
  asm volatile ("csrc %[id], %[src]" :  : [id] "i" (csr_id), [src] "r" (csr_data));
}
 
 
/**********************************************************************/
inline uint32_t __attribute__ ((always_inline)) neorv32_cpu_csr_swap(const int csr_id, uint32_t wdata) {
 
  uint32_t tmp;
  asm volatile ("csrrw %[dst], %[id], %[src]" : [dst] "=r" (tmp) : [id] "i" (csr_id), [src] "r" (wdata));
  return tmp;
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_sleep(void) {
 
  asm volatile ("wfi");
}
 
 
/**********************************************************************/
inline uint32_t __attribute__ ((always_inline)) neorv32_cpu_amolr(uint32_t addr) {
 
#if defined __riscv_atomic
  uint32_t amo_addr = addr;
  uint32_t amo_rdata;
 
  asm volatile ("lr.w %[dst], 0(%[addr])" : [dst] "=r" (amo_rdata) : [addr] "r" (amo_addr));
 
  return amo_rdata;
#else
  (void)addr;
 
  return 0;
#endif
}
 
 
/**********************************************************************/
inline uint32_t __attribute__ ((always_inline)) neorv32_cpu_amosc(uint32_t addr, uint32_t wdata) {
 
#if defined __riscv_atomic
  uint32_t amo_addr  = addr;
  uint32_t amo_wdata = wdata;
  uint32_t amo_status;
 
  asm volatile ("sc.w %[dst], %[src], (%[addr])" : [dst] "=r" (amo_status) : [src] "r" (amo_wdata), [addr] "r" (amo_addr));
 
  return amo_status;
#else
  (void)addr;
  (void)wdata;
 
  return 1; // always fail
#endif
}
 
 
#endif // NEORV32_CPU_H