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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:52 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:52 +0000 |
commit | ca67b09c015d4af3ae3cce12aa72e60941dbb8b5 (patch) | |
tree | b7316d7b06c373e08dabb79a2c866c568e08f49e /debian/grub-extras/disabled/gpxe/src/core/iobuf.c | |
parent | Adding upstream version 2.06. (diff) | |
download | grub2-ca67b09c015d4af3ae3cce12aa72e60941dbb8b5.tar.xz grub2-ca67b09c015d4af3ae3cce12aa72e60941dbb8b5.zip |
Adding debian version 2.06-13+deb12u1.debian/2.06-13+deb12u1debian
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | debian/grub-extras/disabled/gpxe/src/core/iobuf.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/debian/grub-extras/disabled/gpxe/src/core/iobuf.c b/debian/grub-extras/disabled/gpxe/src/core/iobuf.c new file mode 100644 index 0000000..1ce7890 --- /dev/null +++ b/debian/grub-extras/disabled/gpxe/src/core/iobuf.c @@ -0,0 +1,96 @@ +/* + * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include <stdint.h> +#include <errno.h> +#include <gpxe/malloc.h> +#include <gpxe/iobuf.h> + +/** @file + * + * I/O buffers + * + */ + +/** + * Allocate I/O buffer + * + * @v len Required length of buffer + * @ret iobuf I/O buffer, or NULL if none available + * + * The I/O buffer will be physically aligned to a multiple of + * @c IOBUF_SIZE. + */ +struct io_buffer * alloc_iob ( size_t len ) { + struct io_buffer *iobuf = NULL; + void *data; + + /* Pad to minimum length */ + if ( len < IOB_ZLEN ) + len = IOB_ZLEN; + + /* Align buffer length */ + len = ( len + __alignof__( *iobuf ) - 1 ) & + ~( __alignof__( *iobuf ) - 1 ); + + /* Allocate memory for buffer plus descriptor */ + data = malloc_dma ( len + sizeof ( *iobuf ), IOB_ALIGN ); + if ( ! data ) + return NULL; + + iobuf = ( struct io_buffer * ) ( data + len ); + iobuf->head = iobuf->data = iobuf->tail = data; + iobuf->end = iobuf; + return iobuf; +} + +/** + * Free I/O buffer + * + * @v iobuf I/O buffer + */ +void free_iob ( struct io_buffer *iobuf ) { + if ( iobuf ) { + assert ( iobuf->head <= iobuf->data ); + assert ( iobuf->data <= iobuf->tail ); + assert ( iobuf->tail <= iobuf->end ); + free_dma ( iobuf->head, + ( iobuf->end - iobuf->head ) + sizeof ( *iobuf ) ); + } +} + +/** + * Ensure I/O buffer has sufficient headroom + * + * @v iobuf I/O buffer + * @v len Required headroom + * + * This function currently only checks for the required headroom; it + * does not reallocate the I/O buffer if required. If we ever have a + * code path that requires this functionality, it's a fairly trivial + * change to make. + */ +int iob_ensure_headroom ( struct io_buffer *iobuf, size_t len ) { + + if ( iob_headroom ( iobuf ) >= len ) + return 0; + return -ENOBUFS; +} + |