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1 2 zero_gravi 
// #################################################################################################
2 
// # << NEORV32: neorv32_rte.c - NEORV32 Runtime Environment >>                                    #
3 
// # ********************************************************************************************* #
4 
// # BSD 3-Clause License                                                                          #
5 
// #                                                                                               #
6 42 zero_gravi 
// # Copyright (c) 2021, Stephan Nolting. All rights reserved.                                     #
7 2 zero_gravi 
// #                                                                                               #
8 
// # Redistribution and use in source and binary forms, with or without modification, are          #
9 
// # permitted provided that the following conditions are met:                                     #
10 
// #                                                                                               #
11 
// # 1. Redistributions of source code must retain the above copyright notice, this list of        #
12 
// #    conditions and the following disclaimer.                                                   #
13 
// #                                                                                               #
14 
// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of     #
15 
// #    conditions and the following disclaimer in the documentation and/or other materials        #
16 
// #    provided with the distribution.                                                            #
17 
// #                                                                                               #
18 
// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to  #
19 
// #    endorse or promote products derived from this software without specific prior written      #
20 
// #    permission.                                                                                #
21 
// #                                                                                               #
22 
// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS   #
23 
// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF               #
24 
// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE    #
25 
// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,     #
26 
// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
27 
// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED    #
28 
// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING     #
29 
// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED  #
30 
// # OF THE POSSIBILITY OF SUCH DAMAGE.                                                            #
31 
// # ********************************************************************************************* #
32 
// # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #
33 
// #################################################################################################
34 
 
35 
 
36 
/**********************************************************************//**
37 
 * @file neorv32_rte.c
38 
 * @author Stephan Nolting
39 
 * @brief NEORV32 Runtime Environment.
40 
 **************************************************************************/
41 
 
42 
#include "neorv32.h"
43 
#include "neorv32_rte.h"
44 
 
45 14 zero_gravi 
/**********************************************************************//**
46 
 * The >private< trap vector look-up table of the NEORV32 RTE.
47 
 **************************************************************************/
48 58 zero_gravi 
static uint32_t __neorv32_rte_vector_lut[NEORV32_RTE_NUM_TRAPS] __attribute__((unused)); // trap handler vector table
49 14 zero_gravi 
 
50 
// private functions
51 68 zero_gravi 
static void __attribute__((__interrupt__)) __neorv32_rte_core(void) __attribute__((aligned(4)));
52 64 zero_gravi 
static void __neorv32_rte_debug_exc_handler(void);
53 
static void __neorv32_rte_print_true_false(int state);
54 65 zero_gravi 
static void __neorv32_rte_print_checkbox(int state);
55 33 zero_gravi 
static void __neorv32_rte_print_hex_word(uint32_t num);
56 2 zero_gravi 
 
57 
 
58 
/**********************************************************************//**
59 14 zero_gravi 
 * Setup NEORV32 runtime environment.
60 2 zero_gravi 
 *
61 
 * @note This function installs a debug handler for ALL exception and interrupt sources, which
62 14 zero_gravi 
 * gives detailed information about the exception/interrupt. Actual handler can be installed afterwards
63 
 * via neorv32_rte_exception_install(uint8_t id, void (*handler)(void)).
64 2 zero_gravi 
 **************************************************************************/
65 14 zero_gravi 
void neorv32_rte_setup(void) {
66 2 zero_gravi 
 
67 14 zero_gravi 
  // configure trap handler base address
68 68 zero_gravi 
  neorv32_cpu_csr_write(CSR_MTVEC, (uint32_t)(&__neorv32_rte_core));
69 2 zero_gravi 
 
70 
  // install debug handler for all sources
71 14 zero_gravi 
  uint8_t id;
72 
  for (id = 0; id < (sizeof(__neorv32_rte_vector_lut)/sizeof(__neorv32_rte_vector_lut[0])); id++) {
73 
    neorv32_rte_exception_uninstall(id); // this will configure the debug handler
74 2 zero_gravi 
  }
75 68 zero_gravi 
 
76 
  // clear BUSKEEPER error flags
77 
  NEORV32_BUSKEEPER.CTRL = 0;
78 2 zero_gravi 
}
79 
 
80 
 
81 
/**********************************************************************//**
82 
 * Install exception handler function to NEORV32 runtime environment.
83 
 *
84 17 zero_gravi 
 * @note Interrupt sources have to be explicitly enabled by the user via the CSR.mie bits via neorv32_cpu_irq_enable(uint8_t irq_sel)
85 
 * and the global interrupt enable bit mstatus.mie via neorv32_cpu_eint(void).
86 2 zero_gravi 
 *
87 14 zero_gravi 
 * @param[in] id Identifier (type) of the targeted exception. See #NEORV32_RTE_TRAP_enum.
88 
 * @param[in] handler The actual handler function for the specified exception (function MUST be of type "void function(void);").
89 18 zero_gravi 
 * @return 0 if success, 1 if error (invalid id or targeted exception not supported).
90 2 zero_gravi 
 **************************************************************************/
91 14 zero_gravi 
int neorv32_rte_exception_install(uint8_t id, void (*handler)(void)) {
92 2 zero_gravi 
 
93 
  // id valid?
94 48 zero_gravi 
  if ((id >= RTE_TRAP_I_MISALIGNED) && (id <= CSR_MIE_FIRQ15E)) {
95 24 zero_gravi 
    __neorv32_rte_vector_lut[id] = (uint32_t)handler; // install handler
96 2 zero_gravi 
    return 0;
97 
  }
98 
  return 1;
99 
}
100 
 
101 
 
102 
/**********************************************************************//**
103 
 * Uninstall exception handler function from NEORV32 runtime environment, which was
104 14 zero_gravi 
 * previously installed via neorv32_rte_exception_install(uint8_t id, void (*handler)(void)).
105 2 zero_gravi 
 *
106 17 zero_gravi 
 * @note Interrupt sources have to be explicitly disabled by the user via the CSR.mie bits via neorv32_cpu_irq_disable(uint8_t irq_sel)
107 
 * and/or the global interrupt enable bit mstatus.mie via neorv32_cpu_dint(void).
108 2 zero_gravi 
 *
109 14 zero_gravi 
 * @param[in] id Identifier (type) of the targeted exception. See #NEORV32_RTE_TRAP_enum.
110 18 zero_gravi 
 * @return 0 if success, 1 if error (invalid id or targeted exception not supported).
111 2 zero_gravi 
 **************************************************************************/
112 14 zero_gravi 
int neorv32_rte_exception_uninstall(uint8_t id) {
113 2 zero_gravi 
 
114 
  // id valid?
115 48 zero_gravi 
  if ((id >= RTE_TRAP_I_MISALIGNED) && (id <= CSR_MIE_FIRQ15E)) {
116 68 zero_gravi 
    __neorv32_rte_vector_lut[id] = (uint32_t)(&__neorv32_rte_debug_exc_handler); // use dummy handler in case the exception is accidentally triggered
117 2 zero_gravi 
    return 0;
118 
  }
119 
  return 1;
120 
}
121 
 
122 
 
123 
/**********************************************************************//**
124 14 zero_gravi 
 * This is the core of the NEORV32 RTE.
125 
 *
126 
 * @note This function must no be explicitly used by the user.
127 33 zero_gravi 
 * @note The RTE core uses mscratch CSR to store the trap-causing mepc for further (user-defined) processing.
128 
 *
129 14 zero_gravi 
 * @warning When using the the RTE, this function is the ONLY function that can use the 'interrupt' attribute!
130 2 zero_gravi 
 **************************************************************************/
131 68 zero_gravi 
static void __attribute__((__interrupt__)) __attribute__((aligned(4)))  __neorv32_rte_core(void) {
132 2 zero_gravi 
 
133 33 zero_gravi 
  register uint32_t rte_mepc = neorv32_cpu_csr_read(CSR_MEPC);
134 
  neorv32_cpu_csr_write(CSR_MSCRATCH, rte_mepc); // store for later
135 14 zero_gravi 
  register uint32_t rte_mcause = neorv32_cpu_csr_read(CSR_MCAUSE);
136 
 
137 
  // compute return address
138 68 zero_gravi 
  if (((int32_t)rte_mcause) >= 0) { // modify pc only if not interrupt (MSB cleared)
139 14 zero_gravi 
 
140 
    // get low half word of faulting instruction
141 
    register uint32_t rte_trap_inst;
142 
    asm volatile ("lh %[result], 0(%[input_i])" : [result] "=r" (rte_trap_inst) : [input_i] "r" (rte_mepc));
143 
 
144 
    if ((rte_trap_inst & 3) == 3) { // faulting instruction is uncompressed instruction
145 
      rte_mepc += 4;
146 
    }
147 
    else { // faulting instruction is compressed instruction
148 
      rte_mepc += 2;
149 
    }
150 
 
151 
    // store new return address
152 
    neorv32_cpu_csr_write(CSR_MEPC, rte_mepc);
153 
  }
154 
 
155 
  // find according trap handler
156 68 zero_gravi 
  register uint32_t rte_handler;
157 14 zero_gravi 
  switch (rte_mcause) {
158 
    case TRAP_CODE_I_MISALIGNED: rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_I_MISALIGNED]; break;
159 
    case TRAP_CODE_I_ACCESS:     rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_I_ACCESS]; break;
160 
    case TRAP_CODE_I_ILLEGAL:    rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_I_ILLEGAL]; break;
161 
    case TRAP_CODE_BREAKPOINT:   rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_BREAKPOINT]; break;
162 
    case TRAP_CODE_L_MISALIGNED: rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_L_MISALIGNED]; break;
163 
    case TRAP_CODE_L_ACCESS:     rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_L_ACCESS]; break;
164 
    case TRAP_CODE_S_MISALIGNED: rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_S_MISALIGNED]; break;
165 
    case TRAP_CODE_S_ACCESS:     rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_S_ACCESS]; break;
166 40 zero_gravi 
    case TRAP_CODE_UENV_CALL:    rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_UENV_CALL]; break;
167 14 zero_gravi 
    case TRAP_CODE_MENV_CALL:    rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_MENV_CALL]; break;
168 
    case TRAP_CODE_MSI:          rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_MSI]; break;
169 
    case TRAP_CODE_MTI:          rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_MTI]; break;
170 
    case TRAP_CODE_MEI:          rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_MEI]; break;
171 
    case TRAP_CODE_FIRQ_0:       rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_0]; break;
172 
    case TRAP_CODE_FIRQ_1:       rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_1]; break;
173 
    case TRAP_CODE_FIRQ_2:       rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_2]; break;
174 
    case TRAP_CODE_FIRQ_3:       rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_3]; break;
175 47 zero_gravi 
    case TRAP_CODE_FIRQ_4:       rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_4]; break;
176 
    case TRAP_CODE_FIRQ_5:       rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_5]; break;
177 
    case TRAP_CODE_FIRQ_6:       rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_6]; break;
178 
    case TRAP_CODE_FIRQ_7:       rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_7]; break;
179 48 zero_gravi 
    case TRAP_CODE_FIRQ_8:       rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_8]; break;
180 
    case TRAP_CODE_FIRQ_9:       rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_9]; break;
181 
    case TRAP_CODE_FIRQ_10:      rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_10]; break;
182 
    case TRAP_CODE_FIRQ_11:      rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_11]; break;
183 
    case TRAP_CODE_FIRQ_12:      rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_12]; break;
184 
    case TRAP_CODE_FIRQ_13:      rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_13]; break;
185 
    case TRAP_CODE_FIRQ_14:      rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_14]; break;
186 
    case TRAP_CODE_FIRQ_15:      rte_handler = __neorv32_rte_vector_lut[RTE_TRAP_FIRQ_15]; break;
187 68 zero_gravi 
    default:                     rte_handler = (uint32_t)(&__neorv32_rte_debug_exc_handler); break;
188 14 zero_gravi 
  }
189 
 
190 
  // execute handler
191 
  void (*handler_pnt)(void);
192 
  handler_pnt = (void*)rte_handler;
193 
  (*handler_pnt)();
194 2 zero_gravi 
}
195 
 
196 
 
197 
/**********************************************************************//**
198 
 * NEORV32 runtime environment: Debug exception handler, printing various exception/interrupt information via UART.
199 14 zero_gravi 
 * @note This function is used by neorv32_rte_exception_uninstall(void) only.
200 2 zero_gravi 
 **************************************************************************/
201 
static void __neorv32_rte_debug_exc_handler(void) {
202 
 
203 61 zero_gravi 
  if (neorv32_uart0_available() == 0) {
204 
    return; // handler cannot output anything if UART0 is not implemented
205 
  }
206 
 
207 15 zero_gravi 
  // intro
208 65 zero_gravi 
  neorv32_uart0_print("<RTE> ");
209 2 zero_gravi 
 
210 15 zero_gravi 
  // cause
211 7 zero_gravi 
  register uint32_t trap_cause = neorv32_cpu_csr_read(CSR_MCAUSE);
212 66 zero_gravi 
  register char tmp = (char)(trap_cause & 0xf);
213 48 zero_gravi 
  if (tmp >= 10) {
214 
    tmp = 'a' + (tmp - 10);
215 
  }
216 
  else {
217 
    tmp = '0' + tmp;
218 
  }
219 7 zero_gravi 
  switch (trap_cause) {
220 65 zero_gravi 
    case TRAP_CODE_I_MISALIGNED: neorv32_uart0_print("Instruction address misaligned"); break;
221 
    case TRAP_CODE_I_ACCESS:     neorv32_uart0_print("Instruction access fault"); break;
222 
    case TRAP_CODE_I_ILLEGAL:    neorv32_uart0_print("Illegal instruction"); break;
223 
    case TRAP_CODE_BREAKPOINT:   neorv32_uart0_print("Breakpoint"); break;
224 
    case TRAP_CODE_L_MISALIGNED: neorv32_uart0_print("Load address misaligned"); break;
225 
    case TRAP_CODE_L_ACCESS:     neorv32_uart0_print("Load access fault"); break;
226 
    case TRAP_CODE_S_MISALIGNED: neorv32_uart0_print("Store address misaligned"); break;
227 
    case TRAP_CODE_S_ACCESS:     neorv32_uart0_print("Store access fault"); break;
228 
    case TRAP_CODE_UENV_CALL:    neorv32_uart0_print("Environment call from U-mode"); break;
229 
    case TRAP_CODE_MENV_CALL:    neorv32_uart0_print("Environment call from M-mode"); break;
230 
    case TRAP_CODE_MSI:          neorv32_uart0_print("Machine software interrupt"); break;
231 
    case TRAP_CODE_MTI:          neorv32_uart0_print("Machine timer interrupt"); break;
232 
    case TRAP_CODE_MEI:          neorv32_uart0_print("Machine external interrupt"); break;
233 47 zero_gravi 
    case TRAP_CODE_FIRQ_0:
234 
    case TRAP_CODE_FIRQ_1:
235 
    case TRAP_CODE_FIRQ_2:
236 
    case TRAP_CODE_FIRQ_3:
237 
    case TRAP_CODE_FIRQ_4:
238 
    case TRAP_CODE_FIRQ_5:
239 
    case TRAP_CODE_FIRQ_6:
240 48 zero_gravi 
    case TRAP_CODE_FIRQ_7:
241 
    case TRAP_CODE_FIRQ_8:
242 
    case TRAP_CODE_FIRQ_9:
243 
    case TRAP_CODE_FIRQ_10:
244 
    case TRAP_CODE_FIRQ_11:
245 
    case TRAP_CODE_FIRQ_12:
246 
    case TRAP_CODE_FIRQ_13:
247 
    case TRAP_CODE_FIRQ_14:
248 65 zero_gravi 
    case TRAP_CODE_FIRQ_15:      neorv32_uart0_print("Fast interrupt "); neorv32_uart0_putc(tmp); break;
249 
    default:                     neorv32_uart0_print("Unknown trap cause: "); __neorv32_rte_print_hex_word(trap_cause); break;
250 2 zero_gravi 
  }
251 
 
252 66 zero_gravi 
  // check cause if bus access fault exception
253 
  if ((trap_cause == TRAP_CODE_I_ACCESS) || (trap_cause == TRAP_CODE_L_ACCESS) || (trap_cause == TRAP_CODE_S_ACCESS)) {
254 
    register uint32_t bus_err = NEORV32_BUSKEEPER.CTRL;
255 
    if (bus_err & (1<<BUSKEEPER_ERR_FLAG)) { // exception caused by bus system?
256 
      if (bus_err & (1<<BUSKEEPER_ERR_TYPE)) {
257 
        neorv32_uart0_print(" [TIMEOUT_ERR]");
258 
      }
259 
      else {
260 
        neorv32_uart0_print(" [DEVICE_ERR]");
261 
      }
262 
    }
263 
    else { // exception was not caused by bus system -> has to be caused by PMP rule violation
264 
      neorv32_uart0_print(" [PMP_ERR]");
265 
    }
266 
  }
267 
 
268 33 zero_gravi 
  // instruction address
269 65 zero_gravi 
  neorv32_uart0_print(" @ PC=");
270 66 zero_gravi 
  __neorv32_rte_print_hex_word(neorv32_cpu_csr_read(CSR_MSCRATCH)); // rte core stores original mepc to mscratch
271 15 zero_gravi 
 
272 33 zero_gravi 
  // additional info
273 65 zero_gravi 
  neorv32_uart0_print(", MTVAL=");
274 33 zero_gravi 
  __neorv32_rte_print_hex_word(neorv32_cpu_csr_read(CSR_MTVAL));
275 65 zero_gravi 
  neorv32_uart0_print(" </RTE>");
276 6 zero_gravi 
}
277 
 
278 
 
279 
/**********************************************************************//**
280 
 * NEORV32 runtime environment: Print hardware configuration information via UART
281 
 **************************************************************************/
282 
void neorv32_rte_print_hw_config(void) {
283 
 
284 61 zero_gravi 
  if (neorv32_uart0_available() == 0) {
285 
    return; // cannot output anything if UART0 is not implemented
286 
  }
287 
 
288 6 zero_gravi 
  uint32_t tmp;
289 
  int i;
290 
  char c;
291 
 
292 65 zero_gravi 
  neorv32_uart0_printf("\n\n<<< Processor Configuration Overview >>>\n");
293 6 zero_gravi 
 
294 
  // CPU configuration
295 61 zero_gravi 
  neorv32_uart0_printf("\n=== << CPU >> ===\n");
296 6 zero_gravi 
 
297 65 zero_gravi 
  // general
298 
  neorv32_uart0_printf("Clock speed:       %u Hz\n", NEORV32_SYSINFO.CLK);
299 
  neorv32_uart0_printf("Full HW reset:     "); __neorv32_rte_print_true_false(NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_HW_RESET));
300 
  neorv32_uart0_printf("On-chip debugger:  "); __neorv32_rte_print_true_false(NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_OCD));
301 23 zero_gravi 
  // ID
302 61 zero_gravi 
  neorv32_uart0_printf("Hart ID:           0x%x\n"
303 
                       "Vendor ID:         0x%x\n", neorv32_cpu_csr_read(CSR_MHARTID), neorv32_cpu_csr_read(CSR_MVENDORID));
304 12 zero_gravi 
 
305 23 zero_gravi 
  tmp = neorv32_cpu_csr_read(CSR_MARCHID);
306 61 zero_gravi 
  neorv32_uart0_printf("Architecture ID:   0x%x", tmp);
307 32 zero_gravi 
  if (tmp == NEORV32_ARCHID) {
308 61 zero_gravi 
    neorv32_uart0_printf(" (NEORV32)");
309 32 zero_gravi 
  }
310 23 zero_gravi 
 
311 49 zero_gravi 
  // hardware version
312 61 zero_gravi 
  neorv32_uart0_printf("\nImplementation ID: 0x%x (", neorv32_cpu_csr_read(CSR_MIMPID));
313 12 zero_gravi 
  neorv32_rte_print_hw_version();
314 61 zero_gravi 
  neorv32_uart0_putc(')');
315 6 zero_gravi 
 
316 60 zero_gravi 
  // CPU architecture and endianness
317 61 zero_gravi 
  neorv32_uart0_printf("\nArchitecture:      ");
318 6 zero_gravi 
  tmp = neorv32_cpu_csr_read(CSR_MISA);
319 
  tmp = (tmp >> 30) & 0x03;
320 
  if (tmp == 1) {
321 61 zero_gravi 
    neorv32_uart0_printf("rv32-little");
322 6 zero_gravi 
  }
323 40 zero_gravi 
  else {
324 61 zero_gravi 
    neorv32_uart0_printf("unknown");
325 40 zero_gravi 
  }
326 
 
327 
  // CPU extensions
328 61 zero_gravi 
  neorv32_uart0_printf("\nISA extensions:    ");
329 6 zero_gravi 
  tmp = neorv32_cpu_csr_read(CSR_MISA);
330 
  for (i=0; i<26; i++) {
331 
    if (tmp & (1 << i)) {
332 
      c = (char)('A' + i);
333 61 zero_gravi 
      neorv32_uart0_putc(c);
334 
      neorv32_uart0_putc(' ');
335 6 zero_gravi 
    }
336 
  }
337 22 zero_gravi 
 
338 63 zero_gravi 
  // Z* CPU extensions
339 64 zero_gravi 
  tmp = NEORV32_SYSINFO.CPU;
340 63 zero_gravi 
  if (tmp & (1<<SYSINFO_CPU_ZICSR)) {
341 61 zero_gravi 
    neorv32_uart0_printf("Zicsr ");
342 22 zero_gravi 
  }
343 66 zero_gravi 
  if (tmp & (1<<SYSINFO_CPU_ZICNTR)) {
344 
    neorv32_uart0_printf("Zicntr ");
345 
  }
346 
  if (tmp & (1<<SYSINFO_CPU_ZIHPM)) {
347 
    neorv32_uart0_printf("Zihpm ");
348 
  }
349 63 zero_gravi 
  if (tmp & (1<<SYSINFO_CPU_ZIFENCEI)) {
350 61 zero_gravi 
    neorv32_uart0_printf("Zifencei ");
351 22 zero_gravi 
  }
352 63 zero_gravi 
  if (tmp & (1<<SYSINFO_CPU_ZMMUL)) {
353 61 zero_gravi 
    neorv32_uart0_printf("Zmmul ");
354 
  }
355 63 zero_gravi 
  if (tmp & (1<<SYSINFO_CPU_ZFINX)) {
356 61 zero_gravi 
    neorv32_uart0_printf("Zfinx ");
357 53 zero_gravi 
  }
358 63 zero_gravi 
  if (tmp & (1<<SYSINFO_CPU_ZXSCNT)) {
359 61 zero_gravi 
    neorv32_uart0_printf("Zxscnt(!) ");
360 56 zero_gravi 
  }
361 66 zero_gravi 
 
362 63 zero_gravi 
  if (tmp & (1<<SYSINFO_CPU_DEBUGMODE)) {
363 66 zero_gravi 
    neorv32_uart0_printf("Debug ");
364 59 zero_gravi 
  }
365 63 zero_gravi 
  if (tmp & (1<<SYSINFO_CPU_FASTMUL)) {
366 
    neorv32_uart0_printf("FAST_MUL ");
367 
  }
368 
  if (tmp & (1<<SYSINFO_CPU_FASTSHIFT)) {
369 
    neorv32_uart0_printf("FAST_SHIFT ");
370 
  }
371 
 
372 34 zero_gravi 
  // check physical memory protection
373 61 zero_gravi 
  neorv32_uart0_printf("\nPMP:               ");
374 42 zero_gravi 
  uint32_t pmp_num_regions = neorv32_cpu_pmp_get_num_regions();
375 
  if (pmp_num_regions != 0)  {
376 61 zero_gravi 
    neorv32_uart0_printf("%u regions, %u bytes minimal granularity\n", pmp_num_regions, neorv32_cpu_pmp_get_granularity());
377 34 zero_gravi 
  }
378 
  else {
379 61 zero_gravi 
    neorv32_uart0_printf("not implemented\n");
380 34 zero_gravi 
  }
381 
 
382 
 
383 6 zero_gravi 
  // Memory configuration
384 65 zero_gravi 
  neorv32_uart0_printf("\n=== << Memory System >> ===\n");
385 6 zero_gravi 
 
386 66 zero_gravi 
  neorv32_uart0_printf("Boot Config.:        Boot ");
387 65 zero_gravi 
  if (NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_BOOTLOADER)) {
388 
    neorv32_uart0_printf("via Bootloader\n");
389 
  }
390 
  else {
391 
    neorv32_uart0_printf("from memory (@ 0x%x)\n", NEORV32_SYSINFO.ISPACE_BASE);
392 
  }
393 
 
394 66 zero_gravi 
  neorv32_uart0_printf("Instr. base address: 0x%x\n", NEORV32_SYSINFO.ISPACE_BASE);
395 56 zero_gravi 
 
396 
  // IMEM
397 66 zero_gravi 
  neorv32_uart0_printf("Internal IMEM:       ");
398 64 zero_gravi 
  if (NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_MEM_INT_IMEM)) {
399 
    neorv32_uart0_printf("yes, %u bytes\n", NEORV32_SYSINFO.IMEM_SIZE);
400 56 zero_gravi 
  }
401 
  else {
402 61 zero_gravi 
    neorv32_uart0_printf("no\n");
403 56 zero_gravi 
  }
404 6 zero_gravi 
 
405 56 zero_gravi 
  // DMEM
406 66 zero_gravi 
  neorv32_uart0_printf("Data base address:   0x%x\n", NEORV32_SYSINFO.DSPACE_BASE);
407 
  neorv32_uart0_printf("Internal DMEM:       ");
408 65 zero_gravi 
  if (NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_MEM_INT_DMEM)) {
409 
    neorv32_uart0_printf("yes, %u bytes\n", NEORV32_SYSINFO.DMEM_SIZE);
410 
  }
411 
  else {
412 
    neorv32_uart0_printf("no\n");
413 
  }
414 6 zero_gravi 
 
415 56 zero_gravi 
  // i-cache
416 66 zero_gravi 
  neorv32_uart0_printf("Internal i-cache:    ");
417 64 zero_gravi 
  if (NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_ICACHE)) {
418 65 zero_gravi 
    neorv32_uart0_printf("yes, ");
419 41 zero_gravi 
 
420 64 zero_gravi 
    uint32_t ic_block_size = (NEORV32_SYSINFO.CACHE >> SYSINFO_CACHE_IC_BLOCK_SIZE_0) & 0x0F;
421 41 zero_gravi 
    if (ic_block_size) {
422 
      ic_block_size = 1 << ic_block_size;
423 
    }
424 
    else {
425 
      ic_block_size = 0;
426 
    }
427 
 
428 64 zero_gravi 
    uint32_t ic_num_blocks = (NEORV32_SYSINFO.CACHE >> SYSINFO_CACHE_IC_NUM_BLOCKS_0) & 0x0F;
429 41 zero_gravi 
    if (ic_num_blocks) {
430 
      ic_num_blocks = 1 << ic_num_blocks;
431 
    }
432 
    else {
433 
      ic_num_blocks = 0;
434 
    }
435 
 
436 64 zero_gravi 
    uint32_t ic_associativity = (NEORV32_SYSINFO.CACHE >> SYSINFO_CACHE_IC_ASSOCIATIVITY_0) & 0x0F;
437 41 zero_gravi 
    ic_associativity = 1 << ic_associativity;
438 
 
439 65 zero_gravi 
    neorv32_uart0_printf("%u bytes, %u set(s), %u block(s) per set, %u bytes per block", ic_associativity*ic_num_blocks*ic_block_size, ic_associativity, ic_num_blocks, ic_block_size);
440 45 zero_gravi 
    if (ic_associativity == 1) {
441 61 zero_gravi 
      neorv32_uart0_printf(" (direct-mapped)\n");
442 41 zero_gravi 
    }
443 64 zero_gravi 
    else if (((NEORV32_SYSINFO.CACHE >> SYSINFO_CACHE_IC_REPLACEMENT_0) & 0x0F) == 1) {
444 61 zero_gravi 
      neorv32_uart0_printf(" (LRU replacement policy)\n");
445 41 zero_gravi 
    }
446 
    else {
447 61 zero_gravi 
      neorv32_uart0_printf("\n");
448 41 zero_gravi 
    }
449 
  }
450 65 zero_gravi 
  else {
451 
    neorv32_uart0_printf("no\n");
452 
  }
453 41 zero_gravi 
 
454 66 zero_gravi 
  neorv32_uart0_printf("Ext. bus interface:  ");
455 64 zero_gravi 
  __neorv32_rte_print_true_false(NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_MEM_EXT));
456 66 zero_gravi 
  neorv32_uart0_printf("Ext. bus Endianness: ");
457 64 zero_gravi 
  if (NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_MEM_EXT_ENDIAN)) {
458 61 zero_gravi 
    neorv32_uart0_printf("big\n");
459 40 zero_gravi 
  }
460 
  else {
461 61 zero_gravi 
    neorv32_uart0_printf("little\n");
462 40 zero_gravi 
  }
463 6 zero_gravi 
 
464 
  // peripherals
465 61 zero_gravi 
  neorv32_uart0_printf("\n=== << Peripherals >> ===\n");
466 15 zero_gravi 
 
467 64 zero_gravi 
  tmp = NEORV32_SYSINFO.SOC;
468 65 zero_gravi 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_GPIO));   neorv32_uart0_printf(" GPIO\n");
469 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_MTIME));  neorv32_uart0_printf(" MTIME\n");
470 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_UART0));  neorv32_uart0_printf(" UART0\n");
471 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_UART1));  neorv32_uart0_printf(" UART1\n");
472 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_SPI));    neorv32_uart0_printf(" SPI\n");
473 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_TWI));    neorv32_uart0_printf(" TWI\n");
474 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_PWM));    neorv32_uart0_printf(" PWM\n");
475 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_WDT));    neorv32_uart0_printf(" WDT\n");
476 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_TRNG));   neorv32_uart0_printf(" TRNG\n");
477 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_CFS));    neorv32_uart0_printf(" CFS\n");
478 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_SLINK));  neorv32_uart0_printf(" SLINK\n");
479 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_NEOLED)); neorv32_uart0_printf(" NEOLED\n");
480 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_XIRQ));   neorv32_uart0_printf(" XIRQ\n");
481 67 zero_gravi 
  __neorv32_rte_print_checkbox(tmp & (1 << SYSINFO_SOC_IO_GPTMR));  neorv32_uart0_printf(" GPTMR\n");
482 6 zero_gravi 
}
483 
 
484 
 
485 
/**********************************************************************//**
486 50 zero_gravi 
 * NEORV32 runtime environment: Private function to print yes or no.
487 6 zero_gravi 
 * @note This function is used by neorv32_rte_print_hw_config(void) only.
488 
 *
489 65 zero_gravi 
 * @param[in] state Print 'yes' when !=0, print 'no' when 0
490 6 zero_gravi 
 **************************************************************************/
491 
static void __neorv32_rte_print_true_false(int state) {
492 
 
493 
  if (state) {
494 61 zero_gravi 
    neorv32_uart0_print("yes\n");
495 6 zero_gravi 
  }
496 2 zero_gravi 
  else {
497 61 zero_gravi 
    neorv32_uart0_print("no\n");
498 2 zero_gravi 
  }
499 6 zero_gravi 
}
500 2 zero_gravi 
 
501 
 
502 6 zero_gravi 
/**********************************************************************//**
503 65 zero_gravi 
 * NEORV32 runtime environment: Private function to print [x] or [ ].
504 
 * @note This function is used by neorv32_rte_print_hw_config(void) only.
505 
 *
506 
 * @param[in] state Print '[x]' when !=0, print '[ ]' when 0
507 
 **************************************************************************/
508 
static void __neorv32_rte_print_checkbox(int state) {
509 
 
510 
  neorv32_uart0_putc('[');
511 
  if (state) {
512 
    neorv32_uart0_putc('x');
513 
  }
514 
  else {
515 
    neorv32_uart0_putc(' ');
516 
  }
517 
  neorv32_uart0_putc(']');
518 
}
519 
 
520 
 
521 
/**********************************************************************//**
522 33 zero_gravi 
 * NEORV32 runtime environment: Private function to print 32-bit number
523 
 * as 8-digit hexadecimal value (with "0x" suffix).
524 
 *
525 
 * @param[in] num Number to print as hexadecimal.
526 
 **************************************************************************/
527 
void __neorv32_rte_print_hex_word(uint32_t num) {
528 
 
529 
  static const char hex_symbols[16] = "0123456789ABCDEF";
530 
 
531 61 zero_gravi 
  neorv32_uart0_print("0x");
532 33 zero_gravi 
 
533 
  int i;
534 
  for (i=0; i<8; i++) {
535 
    uint32_t index = (num >> (28 - 4*i)) & 0xF;
536 61 zero_gravi 
    neorv32_uart0_putc(hex_symbols[index]);
537 33 zero_gravi 
  }
538 
}
539 
 
540 
 
541 47 zero_gravi 
/**********************************************************************//**
542 41 zero_gravi 
 * NEORV32 runtime environment: Print the processor version in human-readable format.
543 6 zero_gravi 
 **************************************************************************/
544 12 zero_gravi 
void neorv32_rte_print_hw_version(void) {
545 6 zero_gravi 
 
546 
  uint32_t i;
547 
  char tmp, cnt;
548 
 
549 61 zero_gravi 
  if (neorv32_uart0_available() == 0) {
550 
    return; // cannot output anything if UART0 is not implemented
551 
  }
552 
 
553 6 zero_gravi 
  for (i=0; i<4; i++) {
554 
 
555 33 zero_gravi 
    tmp = (char)(neorv32_cpu_csr_read(CSR_MIMPID) >> (24 - 8*i));
556 6 zero_gravi 
 
557 
    // serial division
558 
    cnt = 0;
559 35 zero_gravi 
    while (tmp >= 16) {
560 
      tmp = tmp - 16;
561 6 zero_gravi 
      cnt++;
562 
    }
563 
 
564 
    if (cnt) {
565 61 zero_gravi 
      neorv32_uart0_putc('0' + cnt);
566 6 zero_gravi 
    }
567 61 zero_gravi 
    neorv32_uart0_putc('0' + tmp);
568 6 zero_gravi 
    if (i < 3) {
569 61 zero_gravi 
      neorv32_uart0_putc('.');
570 6 zero_gravi 
    }
571 
  }
572 2 zero_gravi 
}
573 11 zero_gravi 
 
574 
 
575 
/**********************************************************************//**
576 
 * NEORV32 runtime environment: Print project credits
577 
 **************************************************************************/
578 
void neorv32_rte_print_credits(void) {
579 
 
580 61 zero_gravi 
  if (neorv32_uart0_available() == 0) {
581 
    return; // cannot output anything if UART0 is not implemented
582 
  }
583 
 
584 
  neorv32_uart0_print("The NEORV32 RISC-V Processor\n"
585 64 zero_gravi 
                      "(c) 2021, Stephan Nolting\n"
586 61 zero_gravi 
                      "BSD 3-Clause License\n"
587 
                      "https://github.com/stnolting/neorv32\n\n");
588 11 zero_gravi 
}
589 
 
590 22 zero_gravi 
 
591 
/**********************************************************************//**
592 41 zero_gravi 
 * NEORV32 runtime environment: Print project logo
593 37 zero_gravi 
 **************************************************************************/
594 
void neorv32_rte_print_logo(void) {
595 
 
596 40 zero_gravi 
  const uint32_t logo_data_c[11][4] =
597 
  {
598 
    {0b00000000000000000000000000000000,0b00000000000000000000000000000000,0b00000000000000000000000110000000,0b00000000000000000000000000000000},
599 
    {0b00000000000000000000000000000000,0b00000000000000000000000000000000,0b00000000000000000000000110000000,0b00110001100011000000000000000000},
600 
    {0b01100000110001111111110001111111,0b10000111111110001100000011000111,0b11111000011111111000000110000000,0b11111111111111110000000000000000},
601 
    {0b11110000110011000000000011000000,0b11001100000011001100000011001100,0b00001100110000001100000110000011,0b11000000000000111100000000000000},
602 
    {0b11011000110011000000000011000000,0b11001100000011001100000011000000,0b00001100000000011000000110000000,0b11000111111000110000000000000000},
603 
    {0b11001100110011111111100011000000,0b11001111111110001100000011000000,0b11111000000001100000000110000011,0b11000111111000111100000000000000},
604 
    {0b11000110110011000000000011000000,0b11001100001100000110000110000000,0b00001100000110000000000110000000,0b11000111111000110000000000000000},
605 
    {0b11000011110011000000000011000000,0b11001100000110000011001100001100,0b00001100011000000000000110000011,0b11000000000000111100000000000000},
606 
    {0b11000001100001111111110001111111,0b10001100000011000000110000000111,0b11111000111111111100000110000000,0b11111111111111110000000000000000},
607 
    {0b00000000000000000000000000000000,0b00000000000000000000000000000000,0b00000000000000000000000110000000,0b00110001100011000000000000000000},
608 
    {0b00000000000000000000000000000000,0b00000000000000000000000000000000,0b00000000000000000000000110000000,0b00000000000000000000000000000000}
609 
  };
610 
 
611 
  int u,v,w;
612 
  uint32_t tmp;
613 
 
614 61 zero_gravi 
  if (neorv32_uart0_available() == 0) {
615 
    return; // cannot output anything if UART0 is not implemented
616 
  }
617 
 
618 40 zero_gravi 
  for (u=0; u<11; u++) {
619 61 zero_gravi 
    neorv32_uart0_print("\n");
620 40 zero_gravi 
    for (v=0; v<4; v++) {
621 
      tmp = logo_data_c[u][v];
622 
      for (w=0; w<32; w++){
623 61 zero_gravi 
        if (((int32_t)tmp) < 0) { // check MSB
624 
          neorv32_uart0_putc('#');
625 40 zero_gravi 
        }
626 
        else {
627 61 zero_gravi 
          neorv32_uart0_putc(' ');
628 40 zero_gravi 
        }
629 47 zero_gravi 
        tmp <<= 1;
630 40 zero_gravi 
      }
631 
    }
632 
  }
633 61 zero_gravi 
  neorv32_uart0_print("\n");
634 37 zero_gravi 
}
635 
 
636 
 
637 
/**********************************************************************//**
638 22 zero_gravi 
 * NEORV32 runtime environment: Print project license
639 
 **************************************************************************/
640 
void neorv32_rte_print_license(void) {
641 
 
642 61 zero_gravi 
  if (neorv32_uart0_available() == 0) {
643 
    return; // cannot output anything if UART0 is not implemented
644 
  }
645 
 
646 65 zero_gravi 
  neorv32_uart0_print(
647 22 zero_gravi 
  "\n"
648 
  "BSD 3-Clause License\n"
649 
  "\n"
650 42 zero_gravi 
  "Copyright (c) 2021, Stephan Nolting. All rights reserved.\n"
651 22 zero_gravi 
  "\n"
652 
  "Redistribution and use in source and binary forms, with or without modification, are\n"
653 
  "permitted provided that the following conditions are met:\n"
654 
  "\n"
655 
  "1. Redistributions of source code must retain the above copyright notice, this list of\n"
656 
  "   conditions and the following disclaimer.\n"
657 
  "\n"
658 
  "2. Redistributions in binary form must reproduce the above copyright notice, this list of\n"
659 
  "   conditions and the following disclaimer in the documentation and/or other materials\n"
660 
  "   provided with the distribution.\n"
661 
  "\n"
662 
  "3. Neither the name of the copyright holder nor the names of its contributors may be used to\n"
663 
  "   endorse or promote products derived from this software without specific prior written\n"
664 
  "   permission.\n"
665 
  "\n"
666 
  "THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\" AND ANY EXPRESS\n"
667 
  "OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF\n"
668 
  "MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE\n"
669 
  "COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,\n"
670 
  "EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE\n"
671 
  "GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
672 
  "AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING\n"
673 
  "NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED\n"
674 
  "OF THE POSSIBILITY OF SUCH DAMAGE.\n"
675 
  "\n"
676 
  "\n"
677 
  );
678 
}
679 
 
680 44 zero_gravi 
 
681 
/**********************************************************************//**
682 
 * NEORV32 runtime environment: Get MISA CSR value according to *compiler/toolchain configuration*.
683 
 *
684 
 * @return MISA content according to compiler configuration.
685 
 **************************************************************************/
686 
uint32_t neorv32_rte_get_compiler_isa(void) {
687 
 
688 
  uint32_t misa_cc = 0;
689 
 
690 53 zero_gravi 
#if defined __riscv_atomic || defined __riscv_a
691 61 zero_gravi 
  misa_cc |= 1 << CSR_MISA_A;
692 44 zero_gravi 
#endif
693 
 
694 53 zero_gravi 
#ifdef __riscv_b
695 61 zero_gravi 
  misa_cc |= 1 << CSR_MISA_B;
696 53 zero_gravi 
#endif
697 
 
698 
#if defined __riscv_compressed || defined __riscv_c
699 61 zero_gravi 
  misa_cc |= 1 << CSR_MISA_C;
700 44 zero_gravi 
#endif
701 
 
702 53 zero_gravi 
#if (__riscv_flen == 64) || defined __riscv_d
703 61 zero_gravi 
  misa_cc |= 1 << CSR_MISA_D;
704 52 zero_gravi 
#endif
705 
 
706 44 zero_gravi 
#ifdef __riscv_32e
707 61 zero_gravi 
  misa_cc |= 1 << CSR_MISA_E;
708 44 zero_gravi 
#else
709 61 zero_gravi 
  misa_cc |= 1 << CSR_MISA_I;
710 44 zero_gravi 
#endif
711 
 
712 53 zero_gravi 
#if (__riscv_flen == 32) || defined __riscv_f
713 61 zero_gravi 
  misa_cc |= 1 << CSR_MISA_F;
714 52 zero_gravi 
#endif
715 
 
716 53 zero_gravi 
#if defined __riscv_mul || defined __riscv_m
717 61 zero_gravi 
  misa_cc |= 1 << CSR_MISA_M;
718 44 zero_gravi 
#endif
719 
 
720 
#if (__riscv_xlen == 32)
721 61 zero_gravi 
  misa_cc |= 1 << CSR_MISA_MXL_LO;
722 44 zero_gravi 
#elif (__riscv_xlen == 64)
723 61 zero_gravi 
  misa_cc |= 2 << CSR_MISA_MXL_LO;
724 44 zero_gravi 
#else
725 61 zero_gravi 
  misa_cc |= 3 << CSR_MISA_MXL_LO;
726 44 zero_gravi 
#endif
727 
 
728 
  return misa_cc;
729 
}
730 
 
731 
 
732 
/**********************************************************************//**
733 
 * NEORV32 runtime environment: Check required ISA extensions (via compiler flags) against available ISA extensions (via MISA csr).
734 
 *
735 68 zero_gravi 
 * @param[in] silent Show error message (via neorv32.uart) if isa_sw > isa_hw when = 0.
736 44 zero_gravi 
 * @return MISA content according to compiler configuration.
737 
 **************************************************************************/
738 
int neorv32_rte_check_isa(int silent) {
739 
 
740 
  uint32_t misa_sw = neorv32_rte_get_compiler_isa();
741 
  uint32_t misa_hw = neorv32_cpu_csr_read(CSR_MISA);
742 
 
743 
  // mask hardware features that are not used by software
744 
  uint32_t check = misa_hw & misa_sw;
745 
 
746 
  //
747 
  if (check == misa_sw) {
748 
    return 0;
749 
  }
750 
  else {
751 68 zero_gravi 
    if ((silent == 0) && (neorv32_uart0_available() != 0)) {
752 65 zero_gravi 
      neorv32_uart0_printf("\nWARNING! SW_ISA (features required) vs HW_ISA (features available) mismatch!\n"
753 44 zero_gravi 
                          "SW_ISA = 0x%x (compiler flags)\n"
754 
                          "HW_ISA = 0x%x (misa csr)\n\n", misa_sw, misa_hw);
755 
    }
756 
    return 1;
757 
  }
758 
}
759 
 

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