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If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] .TH EFI_ALLOC_AND_INIT 3EXT "February 6, 2018" .SH NAME efi_alloc_and_init, efi_alloc_and_read, efi_free, efi_write, efi_use_whole_disk \- manipulate a disk's EFI Partition Table .SH SYNOPSIS .LP .nf cc [ \fIflag \&.\|.\|.\fR ] \fIfile\fR\&.\|.\|. \fB-lefi\fR [ \fIlibrary \&.\|.\|.\fR ] #include #include \fBint\fR \fBefi_alloc_and_init\fR(\fBint\fR \fIfd\fR, \fBuint32_t\fR \fInparts\fR, \fBdk_gpt_t **\fR\fIvtoc\fR); .fi .LP .nf \fBint\fR \fBefi_alloc_and_read\fR(\fBint\fR \fIfd\fR, \fBdk_gpt_t **\fR\fIvtoc\fR); .fi .LP .nf \fBvoid\fR \fBefi_free\fR(\fBdk_gpt_t *\fR\fIvtoc\fR); .fi .LP .nf \fBint\fR \fBefi_write\fR(\fBint\fR \fIfd\fR, \fBdk_gpt_t *\fR\fIvtoc\fR); .fi .LP .nf \fBint\fR \fBefi_use_whole_disk\fR(\fBint\fR \fIfd\fR); .fi .SH DESCRIPTION .LP The \fBefi_alloc_and_init()\fR function initializes the \fBdk_gpt_t\fR structure specified by \fIvtoc\fR in preparation for a call to \fBefi_write()\fR. It calculates and initializes the \fBefi_version\fR, \fBefi_lbasize\fR, \fBefi_nparts\fR, \fBefi_first_u_lba\fR, \fBefi_last_lba\fR, and \fBefi_last_u_lba\fR members of this structure. The caller can then set the \fBefi_nparts\fR member. .sp .LP The \fBefi_alloc_and_read()\fR function allocates memory and returns the partition table. .sp .LP The \fBefi_free()\fR function frees the memory allocated by \fBefi_alloc_and_init()\fR and \fBefi_alloc_and_read()\fR. .sp .LP The \fBefi_write()\fR function writes the EFI partition table and creates a Protective Master Boot Record (PMBR); see below. .sp .LP The \fBefi_use_whole_disk()\fR function takes any space that is not contained in the disk label and adds it to the last physically non-zero area before the reserved slice (from slice 0 to slice 6 or unallocated space). .sp .LP The \fIfd\fR argument refers to any slice on a raw disk, opened with \fBO_NDELAY\fR. See \fBopen\fR(2). .sp .LP The \fInparts\fR argument specifies the number of desired partitions. .sp .LP The \fIvtoc\fR argument is a \fBdk_gpt_t\fR structure that describes an EFI partition table and contains at least the following members: .sp .in +2 .nf uint_t efi_version; /* set to EFI_VERSION_CURRENT */ uint_t efi_nparts; /* no. of partitions in efi_parts */ uint_t efi_lbasize; /* size of block in bytes */ diskaddr_t efi_last_lba; /* last block on the disk */ diskaddr_t efi_first_u_lba; /* first block after labels */ diskaddr_t efi_last_u_lba; /* last block before backup labels */ struct dk_part efi_parts[]; /* array of partitions */ .fi .in -2 .SS "Protective Master Boot Record" .LP When a disk receives an EFI label, a protective MBR (\fBPMBR\fR) is also written containing a single partiton of type \fBEEh\fR and spanning the entire disk (up to the limit of what can be represented in an MBR). By default that partition is placed in slot 0 of the PMBR and not marked as active. Some BIOS implementations contain bugs that require the entry to be placed into a different slot or to be made active in order for the system to boot successfully. The default behaviour is modified for systems with known firmware bugs, refer to \fB/usr/share/hwdata/efi.fixes\fR for more information. .SH RETURN VALUES .LP Upon successful completion, \fBefi_alloc_and_init()\fR returns 0. Otherwise it returns \fBVT_EIO\fR if an I/O operation to the disk fails. .sp .LP Upon successful completion, \fBefi_alloc_and_read()\fR returns a positive integer indicating the slice index associated with the open file descriptor. Otherwise, it returns a negative integer to indicate one of the following: .sp .ne 2 .na \fB\fBVT_EIO\fR\fR .ad .RS 13n An I/O error occurred. .RE .sp .ne 2 .na \fB\fBVT_ERROR\fR\fR .ad .RS 13n An unknown error occurred. .RE .sp .ne 2 .na \fB\fBVT_EINVAL\fR\fR .ad .RS 13n An EFI label was not found. .RE .sp .LP Upon successful completion, \fBefi_write()\fR returns 0. Otherwise, it returns a negative integer to indicate one of the following: .sp .ne 2 .na \fB\fBVT_EIO\fR\fR .ad .RS 13n An I/O error occurred. .RE .sp .ne 2 .na \fB\fBVT_ERROR\fR\fR .ad .RS 13n An unknown error occurred. .RE .sp .ne 2 .na \fB\fBVT_EINVAL\fR\fR .ad .RS 13n The label contains incorrect data. .RE .sp .LP Upon successfully completion, \fBefi_use_whole_disk()\fR returns 0. Otherwise, it returns a negative integer to indicate one of the following: .sp .ne 2 .na \fB\fBVT_EIO\fR\fR .ad .RS 13n An I/O error occurred. .RE .sp .ne 2 .na \fB\fBVT_ERROR\fR\fR .ad .RS 13n An unknown error occurred. .RE .sp .ne 2 .na \fB\fBVT_EINVAL\fR\fR .ad .RS 13n The label contains incorrect data. .RE .sp .ne 2 .na \fB\fBVT_ENOSPC\fR\fR .ad .RS 13n Space out of label was not found. .RE .SH USAGE .LP The EFI label is used on disks with more than 1^32-1 blocks. For compatibility reasons, the \fBread_vtoc\fR(3EXT) and \fBwrite_vtoc()\fR functions should be used on smaller disks. The application should attempt the \fBread_vtoc()\fR or \fBwrite_vtoc()\fR call, check for an error of \fBVT_ENOTSUP\fR, then call the analogous EFI function. .SH ATTRIBUTES .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed _ MT-Level Unsafe .TE .SH SEE ALSO .LP \fBfmthard\fR(1M), \fBformat\fR(1M), \fBprtvtoc\fR(1M), \fBioctl\fR(2), \fBopen\fR(2), \fBlibefi\fR(3LIB), \fBread_vtoc\fR(3EXT), \fBattributes\fR(5), \fBdkio\fR(7I)