hpm_csr_drv.h

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/*
 * Copyright (c) 2023 HPMicro
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *
 */
#ifndef HPM_CSR_DRV_H
#define HPM_CSR_DRV_H
 
#include "hpm_csr_regs.h"
#include "riscv/riscv_core.h"
 
 
#ifdef __cplusplus
extern "C" {
#endif
 
static inline void hpm_csr_enable_access_to_csr_cycle(void)
{
    uint32_t mcounter_en = read_csr(CSR_MCOUNTEREN);
    write_csr(CSR_MCOUNTEREN, mcounter_en | CSR_MCOUNTEREN_CY_MASK);
}
 
static inline void hpm_csr_disable_access_to_csr_cycle(void)
{
    uint32_t mcounter_en = read_csr(CSR_MCOUNTEREN);
    write_csr(CSR_MCOUNTEREN, mcounter_en & ~CSR_MCOUNTEREN_CY_MASK);
}
 
static inline uint64_t hpm_csr_get_core_cycle(void)
{
    uint64_t result;
    uint32_t resultl_first = read_csr(CSR_CYCLE);
    uint32_t resulth = read_csr(CSR_CYCLEH);
    uint32_t resultl_second = read_csr(CSR_CYCLE);
    if (resultl_first < resultl_second) {
        result = ((uint64_t)resulth << 32) | resultl_first; /* if CYCLE didn't roll over, return the value directly */
    } else {
        resulth = read_csr(CSR_CYCLEH);
        result = ((uint64_t)resulth << 32) | resultl_second; /* if CYCLE rolled over, need to get the CYCLEH again */
    }
    return result;
 }
 
static inline uint64_t hpm_csr_get_core_mcycle(void)
{
    uint64_t result;
    uint32_t resultl_first = read_csr(CSR_MCYCLE);
    uint32_t resulth = read_csr(CSR_MCYCLEH);
    uint32_t resultl_second = read_csr(CSR_MCYCLE);
    if (resultl_first < resultl_second) {
        result = ((uint64_t)resulth << 32) | resultl_first; /* if MCYCLE didn't roll over, return the value directly */
    } else {
        resulth = read_csr(CSR_MCYCLEH);
        result = ((uint64_t)resulth << 32) | resultl_second; /* if MCYCLE rolled over, need to get the MCYCLEH again */
    }
    return result;
 }
 
 
#ifdef __cplusplus
}
#endif
 
#endif /* HPM_CSR_DRV_H */