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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.
*
* ----------------------------------------------------------------------- */
/*
* pxe_get_cached.c
*
* PXE call "get cached info"
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <com32.h>
#include <syslinux/pxe.h>
/* Returns the status code from PXE (0 on success),
or -1 on invocation failure */
int pxe_get_cached_info(int level, void **buf, size_t *len)
{
com32sys_t regs;
t_PXENV_GET_CACHED_INFO *gci = __com32.cs_bounce;
void *bbuf, *nbuf;
memset(®s, 0, sizeof regs);
regs.eax.w[0] = 0x0009;
regs.ebx.w[0] = PXENV_GET_CACHED_INFO;
regs.es = SEG(gci);
regs.edi.w[0] = OFFS(gci);
bbuf = &gci[1];
gci->Status = PXENV_STATUS_FAILURE;
gci->PacketType = level;
gci->BufferSize = gci->BufferLimit = 65536-sizeof(*gci);
gci->Buffer.seg = SEG(bbuf);
gci->Buffer.offs = OFFS(bbuf);
__intcall(0x22, ®s, ®s);
if (regs.eflags.l & EFLAGS_CF)
return -1;
if (gci->Status)
return gci->Status;
nbuf = malloc(gci->BufferSize); /* malloc() does not use the bounce buffer */
if (!nbuf)
return -1;
memcpy(nbuf, bbuf, gci->BufferSize);
*buf = nbuf;
*len = gci->BufferSize;
return 0;
}
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