neorv32_cpu_amo.h

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// ================================================================================ //
// The NEORV32 RISC-V Processor - https://github.com/stnolting/neorv32              //
// Copyright (c) NEORV32 contributors.                                              //
// Copyright (c) 2020 - 2024 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_amo_h
#define neorv32_cpu_amo_h
 
#include <stdint.h>
 
 
/**********************************************************************/
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
}
 
 
/**********************************************************************/
uint32_t neorv32_cpu_amoswapw(uint32_t addr, uint32_t wdata);
uint32_t neorv32_cpu_amoaddw(uint32_t addr, uint32_t wdata);
uint32_t neorv32_cpu_amoandw(uint32_t addr, uint32_t wdata);
uint32_t neorv32_cpu_amoorw(uint32_t addr, uint32_t wdata);
uint32_t neorv32_cpu_amoxorw(uint32_t addr, uint32_t wdata);
int32_t  neorv32_cpu_amomaxw(uint32_t addr, int32_t wdata);
uint32_t neorv32_cpu_amomaxuw(uint32_t addr, uint32_t wdata);
int32_t  neorv32_cpu_amominw(uint32_t addr, int32_t wdata);
uint32_t neorv32_cpu_amominuw(uint32_t addr, uint32_t wdata);
#endif // neorv32_cpu_amo_h