neorv32_cpu.h

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// #################################################################################################
// # << NEORV32: neorv32_cpu.h - CPU Core Functions HW Driver >>                                   #
// # ********************************************************************************************* #
// # BSD 3-Clause License                                                                          #
// #                                                                                               #
// # Copyright (c) 2022, Stephan Nolting. All rights reserved.                                     #
// #                                                                                               #
// # 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.                                                   #
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// # 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.                                                            #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to  #
// #    endorse or promote products derived from this software without specific prior written      #
// #    permission.                                                                                #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF               #
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// # ********************************************************************************************* #
// # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #
// #################################################################################################
 
 
/**********************************************************************/
#ifndef neorv32_cpu_h
#define neorv32_cpu_h
 
// prototypes
int      neorv32_cpu_irq_enable(uint8_t irq_sel);
int      neorv32_cpu_irq_disable(uint8_t irq_sel);
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);
uint64_t neorv32_cpu_get_systime(void);
void     neorv32_cpu_delay_ms(uint32_t time_ms);
uint32_t neorv32_cpu_get_clk_from_prsc(int prsc);
uint32_t neorv32_cpu_pmp_get_num_regions(void);
uint32_t neorv32_cpu_pmp_get_granularity(void);
int      neorv32_cpu_pmp_configure_region(uint32_t index, uint32_t base, uint8_t config);
uint32_t neorv32_cpu_hpm_get_num_counters(void);
uint32_t neorv32_cpu_hpm_get_size(void);
void     neorv32_cpu_goto_user_mode(void);
 
 
/**********************************************************************/
extern void __attribute__ ((weak)) __neorv32_crt0_after_main(int32_t return_code);
 
 
/**********************************************************************/
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 %[result], %[input_i]" : [result] "=r" (csr_data) : [input_i] "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 %[input_i], %[input_j]" :  : [input_i] "i" (csr_id), [input_j] "r" (csr_data));
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_sleep(void) {
 
  asm volatile ("wfi");
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_eint(void) {
 
  asm volatile ("csrrsi zero, mstatus, %0" : : "i" (1 << CSR_MSTATUS_MIE));
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_dint(void) {
 
  asm volatile ("csrrci zero, mstatus, %0" : : "i" (1 << CSR_MSTATUS_MIE));
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_breakpoint(void) {
 
  asm volatile ("ebreak");
}
 
 
/**********************************************************************/
inline void __attribute__ ((always_inline)) neorv32_cpu_env_call(void) {
 
  asm volatile ("ecall");
}
 
 
#endif // neorv32_cpu_h