10-13-2009
Thank you for your response and it seems that \U does not work indeed, as you suggested. The code works on Linux however.
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LEARN ABOUT LINUX
s390_sthyi
S390_STHYI(2) System Calls Manual S390_STHYI(2)
NAME
s390_sthyi - emulate STHYI instruction
SYNOPSIS
#include <asm/unistd.h>
int s390_sthyi(unsigned long function_code, void *resp_buffer,
uint64_t *return_code, unsigned long flags);
DESCRIPTION
The 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.
The function_code argument indicates which function to perform. The following code(s) are supported:
0 Return CP (Central Processor) and IFL (Integrated Facility for Linux) capacity information.
The resp_buffer argument specifies the address of a response buffer. When the function_code is 0, 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.
The return_code argument stores the return code of the STHYI instruction, using one of the following values:
0 Success.
4 Unsupported function code.
For further details about return_code, function_code, and resp_buffer, see the reference given in NOTES.
The flags argument is provided to allow for future extensions and currently must be set to 0.
RETURN VALUE
On success (that is: emulation succeeded), the return value of 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 *resp_buffer. A return value of 3
indicates "unsupported function code" and the content of *resp_buffer is unchanged. The return values 1 and 2 are reserved.
On error, -1 is returned, and errno is set appropriately.
ERRORS
EFAULT The value specified in resp_buffer or return_code is not a valid address.
EINVAL The value specified in flags is nonzero.
ENOMEM Allocating memory for handling the CPU capacity information failed.
EOPNOTSUPP
The value specified in function_code is not valid.
VERSIONS
This system call is available since Linux 4.15.
CONFORMING TO
This Linux-specific system call is available only on the s390 architecture.
NOTES
Glibc does not provide a wrapper for this system call, use syscall(2) to call it.
For details of the STHYI instruction, see the documentation page <https://www.ibm.com/support/knowledgecenter/SSB27U_6.3.0
/com.ibm.zvm.v630.hcpb4/hcpb4sth.htm>.
When the system call interface is used, the response buffer doesn't have to fulfill alignment requirements described in the STHYI instruc-
tion definition.
The kernel caches the response (for up to one second, as of Linux 4.16). Subsequent system call invocations may return the cached
response.
SEE ALSO
syscall(2)
Linux Programmer's Manual 2019-03-06 S390_STHYI(2)