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[sw/lib] add CSR swap function
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stnolting 2025-03-29 20:06:19 +01:00
parent dbbba7631e
commit efe240254b
1 changed files with 15 additions and 0 deletions
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15
sw/lib/include/neorv32_cpu.h
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@ -213,6 +213,21 @@ inline void __attribute__ ((always_inline)) neorv32_cpu_csr_clr(const int csr_id
}
/**********************************************************************//**
* Atomic write-after-read CSR operation.
*
* @param[in] csr_id ID of CSR. See #NEORV32_CSR_enum.
* @param[in] wdata New data to write to selected CSR.
* @return Old data read from selected CSR.
**************************************************************************/
inline uint32_t __attribute__ ((always_inline)) neorv32_cpu_csr_swap(const int csr_id, uint32_t wdata) {
uint32_t tmp;
asm volatile ("csrrw %[dst], %[id], %[src]" : [dst] "=r" (tmp) : [id] "i" (csr_id), [src] "r" (wdata));
return tmp;
}
/**********************************************************************//**
* Put CPU into sleep / power-down mode.
*