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[/] [neorv32/] [trunk/] [sw/] [lib/] [include/] [neorv32_cpu.h] - Rev 26
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// ################################################################################################# // # << NEORV32: neorv32_cpu.h - CPU Core Functions HW Driver >> # // # ********************************************************************************************* # // # BSD 3-Clause License # // # # // # Copyright (c) 2020, 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. # // # # // # 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. # // # # // # 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. # // # # // # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS # // # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF # // # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE # // # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, # // # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE # // # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED # // # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING # // # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED # // # OF THE POSSIBILITY OF SUCH DAMAGE. # // # ********************************************************************************************* # // # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting # // ################################################################################################# /**********************************************************************//** * @file neorv32_cpu.h * @author Stephan Nolting * @brief CPU Core Functions HW driver header file. **************************************************************************/ #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); void __attribute__((naked)) neorv32_cpu_goto_user_mode(void); /**********************************************************************//** * Read data from CPU configuration and status register (CSR). * * @param[in] csr_id ID of CSR to read. See #NEORV32_CPU_CSRS_enum. * @return Read data (uint32_t). **************************************************************************/ inline uint32_t __attribute__ ((always_inline)) neorv32_cpu_csr_read(const int csr_id) { register uint32_t csr_data; asm volatile ("csrr %[result], %[input_i]" : [result] "=r" (csr_data) : [input_i] "i" (csr_id)); return csr_data; } /**********************************************************************//** * Write data to CPU configuration and status register (CSR). * * @param[in] csr_id ID of CSR to write. See #NEORV32_CPU_CSRS_enum. * @param[in] data Data to write (uint32_t). **************************************************************************/ inline void __attribute__ ((always_inline)) neorv32_cpu_csr_write(const int csr_id, uint32_t data) { register uint32_t csr_data = data; asm volatile ("csrw %[input_i], %[input_j]" : : [input_i] "i" (csr_id), [input_j] "r" (csr_data)); } /**********************************************************************//** * Put CPU into "sleep" mode. * * @note This function executes the WFI insstruction. * The WFI (wait for interrupt) instruction will make the CPU stall until * an interupt request is detected. Interrupts have to be globally enabled * and at least one external source must be enabled (e.g., the CLIC or the machine * timer) to allow the CPU to wake up again. If 'Zicsr' CPU extension is disabled, * this will permanently stall the CPU. **************************************************************************/ inline void __attribute__ ((always_inline)) neorv32_cpu_sleep(void) { asm volatile ("wfi"); } /**********************************************************************//** * Enable global CPU interrupts (via MIE flag in mstatus CSR). **************************************************************************/ inline void __attribute__ ((always_inline)) neorv32_cpu_eint(void) { asm volatile ("csrrsi zero, mstatus, %0" : : "i" (1 << CPU_MSTATUS_MIE)); } /**********************************************************************//** * Disable global CPU interrupts (via MIE flag in mstatus CSR). **************************************************************************/ inline void __attribute__ ((always_inline)) neorv32_cpu_dint(void) { asm volatile ("csrrci zero, mstatus, %0" : : "i" (1 << CPU_MSTATUS_MIE)); } /**********************************************************************//** * Trigger breakpoint exception (via EBREAK instruction). **************************************************************************/ inline void __attribute__ ((always_inline)) neorv32_cpu_breakpoint(void) { asm volatile ("ebreak"); } /**********************************************************************//** * Trigger "environment call" exception (via ECALL instruction). **************************************************************************/ inline void __attribute__ ((always_inline)) neorv32_cpu_env_call(void) { asm volatile ("ecall"); } #endif // neorv32_cpu_h
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