add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/s390/kernel/sthyi.c
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@@ -460,9 +460,9 @@
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  *
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  * Fills the destination with system information returned by the STHYI
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  * instruction. The data is generated by emulation or execution of STHYI,
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- * if available. The return value is the condition code that would be
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- * returned, the rc parameter is the return code which is passed in
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- * register R2 + 1.
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+ * if available. The return value is either a negative error value or
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+ * the condition code that would be returned, the rc parameter is the
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+ * return code which is passed in register R2 + 1.
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  */
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 int sthyi_fill(void *dst, u64 *rc)
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 {