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-.\" Copyright IBM Corp. 2017
-.\" Author: QingFeng Hao <haoqf@linux.vnet.ibm.com>
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.TH s390_sthyi 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-s390_sthyi \- emulate STHYI instruction
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.BR "#include <asm/sthyi.h>" "        /* Definition of " STHYI_* " constants */"
-.BR "#include <sys/syscall.h>" "      /* Definition of " SYS_* " constants */"
-.B #include <unistd.h>
-.P
-.BI "int syscall(SYS_s390_sthyi, unsigned long " function_code ,
-.BI "            void *" resp_buffer ", uint64_t *" return_code ,
-.BI "            unsigned long " flags );
-.fi
-.P
-.IR Note :
-glibc provides no wrapper for
-.BR s390_sthyi (),
-necessitating the use of
-.BR syscall (2).
-.SH DESCRIPTION
-The
-.BR s390_sthyi ()
-system call emulates the STHYI (Store Hypervisor Information) instruction.
-It provides hardware resource information for the machine and its
-virtualization levels.
-This includes CPU type and capacity, as well as the machine model and
-other metrics.
-.P
-The
-.I function_code
-argument indicates which function to perform.
-The following code(s) are supported:
-.TP
-.B STHYI_FC_CP_IFL_CAP
-Return CP (Central Processor) and IFL (Integrated Facility for Linux)
-capacity information.
-.P
-The
-.I resp_buffer
-argument specifies the address of a response buffer.
-When the
-.I function_code
-is
-.BR STHYI_FC_CP_IFL_CAP ,
-the buffer must be one page (4K) in size.
-If the system call returns 0,
-the response buffer will be filled with CPU capacity information.
-Otherwise, the response buffer's content is unchanged.
-.P
-The
-.I return_code
-argument stores the return code of the STHYI instruction,
-using one of the following values:
-.TP
-0
-Success.
-.TP
-4
-Unsupported function code.
-.P
-For further details about
-.IR return_code ,
-.IR function_code ,
-and
-.IR resp_buffer ,
-see the reference given in NOTES.
-.P
-The
-.I flags
-argument is provided to allow for future extensions and currently
-must be set to 0.
-.SH RETURN VALUE
-On success (that is: emulation succeeded), the return value of
-.BR s390_sthyi ()
-matches the condition code of the STHYI instructions, which is a value
-in the range [0..3].
-A return value of 0 indicates that CPU capacity information is stored in
-.IR *resp_buffer .
-A return value of 3 indicates "unsupported function code" and the content of
-.I *resp_buffer
-is unchanged.
-The return values 1 and 2 are reserved.
-.P
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-The value specified in
-.I resp_buffer
-or
-.I return_code
-is not a valid address.
-.TP
-.B EINVAL
-The value specified in
-.I flags
-is nonzero.
-.TP
-.B ENOMEM
-Allocating memory for handling the CPU capacity information failed.
-.TP
-.B EOPNOTSUPP
-The value specified in
-.I function_code
-is not valid.
-.SH STANDARDS
-Linux on s390.
-.SH HISTORY
-Linux 4.15.
-.SH NOTES
-For details of the STHYI instruction, see
-.UR https://www.ibm.com\:/support\:/knowledgecenter\:/SSB27U_6.3.0\:/com.ibm.zvm.v630.hcpb4\:/hcpb4sth.htm
-the documentation page
-.UE .
-.P
-When the system call interface is used, the response buffer doesn't
-have to fulfill alignment requirements described in the STHYI
-instruction definition.
-.P
-The kernel caches the response (for up to one second, as of Linux 4.16).
-Subsequent system call invocations may return the cached response.
-.SH SEE ALSO
-.BR syscall (2)