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+.\" Copyright (C) 2021 Intel Corporation
+.\"
+.\" %%%LICENSE_START(VERBATIM)
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+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
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+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\"
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
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+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\"
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\" %%%LICENSE_END
+.\"
+.TH SGX 7 2021\-02\-02 "Linux" "Linux Programmer's Manual"
+.PP
+sgx - overview of Software Guard eXtensions
+.SH SYNOPSIS
+.EX
+.B #include <asm/sgx.h>
+.PP
+.IB enclave " = open(""/dev/sgx_enclave"", O_RDWR);"
+.EE
+.SH DESCRIPTION
+Intel Software Guard eXtensions (SGX) allow applications to host
+enclaves,
+protected executable objects in memory.
+.PP
+Enclaves are blobs of executable code,
+running inside a CPU enforced container,
+which is mapped to the process address space.
+They are represented as the instances of
+.IR /dev/sgx_enclave .
+They have a fixed set of entry points,
+defined when the enclave is built.
+.PP
+SGX can only be available if the kernel is configured and built with the
+.B CONFIG_X86_SGX
+option.
+If CPU, BIOS and kernel have SGX enabled,
+.I sgx
+appears in the
+.I flags
+field of
+.IR /proc/cpuinfo .
+.PP
+If SGX appears not to be available,
+ensure that SGX is enabled in the BIOS.
+If a BIOS presents a choice between
+.I Enabled
+and
+.I Software Enabled
+modes for SGX,
+choose
+.IR Enabled .
+.PP
+.SS Memory mapping
+The file descriptor for an enclave can be shared among multiple processes.
+An enclave is required by the CPU to be placed to an address,
+which is a multiple of its size.
+An address range containing a reasonable base address can be probed with an anonymous
+.BR mmap(2)
+call:
+.PP
+.EX
+void *area = mmap(NULL, size * 2, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS,
+                  -1, 0);
+
+void *base = ((uint64_t)area + size - 1) & ~(size - 1);
+.EE
+.PP
+The enclave file descriptor itself can be then mapped with the
+.BR MAP_FIXED
+flag set to the carved out memory.
+.SS Construction
+An enclave instance is created by opening
+.IR /dev/sgx_enclave .
+Its contents are populated with the
+.BR ioctl (2)
+interface in
+.IR <asm/sgx.h> :
+.TP
+.IB SGX_IOC_ENCLAVE_CREATE
+Create SGX Enclave Control Structure (SECS) for the enclave.
+SECS is a hardware defined structure,
+which contains the global properties of an enclave.
+.IB SGX_IOC_ENCLAVE_CREATE
+is a one-shot call that fixes the enclave's address and
+size for the rest of its life-cycle.
+.TP
+.IB SGX_IOC_ENCLAVE_ADD_PAGES
+Fill a range of the enclave's pages with the caller provided data and protection bits.
+Memory mappings of the enclave can only set protection bits that are defined in this ioctl.
+The pages added are either regular pages for code and data,
+or thread control structures (TCS).
+The latter define the entry points to the enclave,
+which can be entered after the initialization.
+.TP
+.IB SGX_IOC_ENCLAVE_INIT
+Initialize the enclave for the run-time.
+After a successful initialization,
+no new pages can be added to the enclave.
+.SS Invocation
+Thread control structure (TCS) pages are the entry points to the enclave,
+which further define an offset inside the enclave where the execution begins.
+The entry points are invoked with
+.IR __vdso_sgx_enter_enclave .
+The prototype for the vDSO is defined by
+.BR vdso_sgx_enter_enclave_t
+in
+.IR <asm/sgx.h> .
+.SS Permissions
+.PP
+During the build process each enclave page is assigned protection bits,
+as part of
+.BR ioctl(SGX_IOC_ENCLAVE_ADD_PAGES).
+These protections are also the maximum protections with which the page can be be mapped.
+If
+.BR mmap (2)
+is called with higher protections than those defined during the build,
+it will return
+.B -EACCES.
+If
+.BR ioctl(SGX_IOC_ENCLAVE_ADD_PAGES)
+is called after
+.BR mmap (2)
+with lower protections,
+the caller receives
+.BR SIGBUS,
+once it accesses the page for the first time.
+.SH VERSIONS
+The SGX feature was added in Linux 5.11.
+.SH SEE ALSO
+.BR ioctl (2),
+.BR mmap (2),
+.BR mprotect (2)
