OpenCores
URL https://opencores.org/ocsvn/neorv32/neorv32/trunk

Subversion Repositories neorv32

Compare Revisions

  • This comparison shows the changes necessary to convert path 
    /neorv32/trunk/sw/lib/source
    from Rev 10 to Rev 11
    ↔ Reverse comparison
  •

Rev 10 → Rev 11

/neorv32_cpu.c
44,54 → 44,6
 
 
/**********************************************************************//**
* Enable/disable CPU extension during runtime via the 'misa' CSR.
*
* @warning This is still highly experimental! This function requires the Zicsr + Zifencei CPU extensions.
*
* @param[in] sel Bit to be set in misa CSR / extension to be enabled. See #NEORV32_CPU_MISA_enum.
* @param[in] state Set 1 to enable the selected extension, set 0 to disable it;
* return 0 if success, 1 if error (invalid sel or extension cannot be enabled).
**************************************************************************/
int neorv32_cpu_switch_extension(int sel, int state) {
 
// get current misa setting
uint32_t misa_curr = neorv32_cpu_csr_read(CSR_MISA);
uint32_t misa_prev = misa_curr;
 
// abort if misa.z is cleared
if ((misa_curr & (1 << CPU_MISA_Z_EXT)) == 0) {
return 1;
}
 
// out of range?
if (sel > 25) {
return 1;
}
 
// enable/disable selected extension
if (state & 1) {
misa_curr |= (1 << sel);
}
else {
misa_curr &= ~(1 << sel);
}
 
// try updating misa
neorv32_cpu_csr_write(CSR_MISA, misa_curr);
asm volatile("fence.i"); // required to flush prefetch buffers
asm volatile("nop");
 
// dit it work?
if (neorv32_cpu_csr_read(CSR_MISA) == misa_prev) {
return 1; // nope
}
else {
return 0; // fine
}
}
 
 
/**********************************************************************//**
* Enable specific CPU interrupt.
*
* @note Interrupts have to be globally enabled via neorv32_cpu_eint(void), too.
/neorv32_mtime.c
62,10 → 62,23
 
 
/**********************************************************************//**
* Get current system time since reset.
* Set current system time.
*
* @note The MTIME timer increments with the primary processor clock.
*
* @param[in] time New system time (uint64_t)
**************************************************************************/
void neorv32_mtime_set_time(uint64_t time) {
 
MTIME = time;
}
 
 
/**********************************************************************//**
* Get current system time.
*
* @note The MTIME timer increments with the primary processor clock.
*
* @return Current system time (uint64_t)
**************************************************************************/
uint64_t neorv32_mtime_get_time(void) {
/neorv32_rte.c
373,3 → 373,16
}
}
}
 
 
/**********************************************************************//**
* NEORV32 runtime environment: Print project credits
**************************************************************************/
void neorv32_rte_print_credits(void) {
 
neorv32_uart_print("\n\nThe NEORV32 Processor Project\n"
"by Stephan Nolting\n"
"https://github.com/stnolting/neorv32\n"
"made in Hannover, Germany\n\n");
}
 

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.