xiaoxiang781216 commented on a change in pull request #5782:
URL: https://github.com/apache/incubator-nuttx/pull/5782#discussion_r835551620
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File path: arch/risc-v/include/syscall.h
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@@ -391,6 +396,64 @@ static inline uintptr_t sys_call6(unsigned int nbr,
uintptr_t parm1,
return r0;
}
+#ifdef CONFIG_ARCH_USE_S_MODE
+
+/* In S-mode the kernel cannot ecall to itself, because ecall will raise
+ * privileges to M-mode, which is not what we want. Instead, use the syscall
+ * trampoline to do the same.
+ */
+
+static inline uintptr_t ksys_call3(unsigned int nbr, uintptr_t parm1,
Review comment:
Since ksys_call is only used by up_xxx internally, it's better to move
it to internal header file(e.g. risc_internal.h or new file).
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