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/* ----------------------------------------------------------------------- *
*
* Copyright 2007 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* shuffle.c
*
* Common code for "shuffle and boot" operation; generates a shuffle list
* and puts it in the bounce buffer. Returns the number of shuffle
* descriptors.
*/
#include <stdlib.h>
#include <inttypes.h>
#include <com32.h>
#include <syslinux/movebits.h>
struct shuffle_descriptor {
uint32_t dst, src, len;
};
int syslinux_prepare_shuffle(struct syslinux_movelist *fraglist,
struct syslinux_memmap *memmap)
{
struct syslinux_movelist *moves = NULL, *mp;
struct syslinux_memmap *ml;
struct shuffle_descriptor *dp;
int np, rv = -1;
if (syslinux_compute_movelist(&moves, fraglist, memmap))
goto bail;
dp = __com32.cs_bounce;
np = 0;
/* Copy the move sequence into the bounce buffer */
for (mp = moves; mp; mp = mp->next) {
if (np >= 65536/12)
goto bail; /* Way too many descriptors... */
dp->dst = mp->dst;
dp->src = mp->src;
dp->len = mp->len;
dp++; np++;
}
/* Copy any zeroing operations into the bounce buffer */
for (ml = memmap; ml->type != SMT_END; ml = ml->next) {
if (ml->type == SMT_ZERO) {
if (np >= 65536/12)
goto bail;
dp->dst = ml->start;
dp->src = (addr_t)-1; /* bzero this region */
dp->len = ml->next->start - ml->start;
dp++; np++;
}
}
rv = np;
bail:
/* This is safe only because free() doesn't use the bounce buffer!!!! */
if (moves)
syslinux_free_movelist(moves);
return rv;
}
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