pkarashchenko commented on a change in pull request #5758:
URL: https://github.com/apache/incubator-nuttx/pull/5758#discussion_r829098061
##########
File path: arch/risc-v/src/common/riscv_cpuindex.c
##########
@@ -48,10 +50,14 @@
*
****************************************************************************/
-int up_cpu_index(void)
+uintptr_t riscv_cpuindex(void)
{
- int mhartid;
+ return READ_CSR(mhartid);
+}
- asm volatile ("csrr %0, mhartid": "=r" (mhartid));
- return mhartid;
+#ifdef CONFIG_SMP
+int up_cpu_index(void)
+{
+ return (int)riscv_cpuindex();
Review comment:
This can be a solution. Sorry I'm not fully aware about the values that
`mhartid` can carry, so I'm just interested can we go with
```
int up_cpu_index(void)
{
uintptr_t mhartid = READ_CSR(mhartid);
return mhartid;
}
```
or even with
```
int up_cpu_index(void)
{
return READ_CSR(mhartid);
}
```
?? do we need the upper bits? because if the values are `0..50` for example,
then maybe we can reuse existing API and not introduce `riscv_cpuindex`.
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