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/*
* Copyright (C) 2008 - Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef UST_HEADER_INLINE_H
#define UST_HEADER_INLINE_H
#include <ust/core.h>
/*
* ust_get_header_size
*
* Calculate alignment offset to 32-bits. This is the alignment offset of the
* event header.
*
* Important note :
* The event header must be 32-bits. The total offset calculated here :
*
* Alignment of header struct on 32 bits (min arch size, header size)
* + sizeof(header struct) (32-bits)
* + (opt) u16 (ext. event id)
* + (opt) u16 (event_size) (if event_size == 0xFFFFUL, has ext. event size)
* + (opt) u32 (ext. event size)
* + (opt) u64 full TSC (aligned on min(64-bits, arch size))
*
* The payload must itself determine its own alignment from the biggest type it
* contains.
* */
static __inline__ unsigned char ust_get_header_size(
struct ust_channel *channel,
size_t offset,
size_t data_size,
size_t *before_hdr_pad,
unsigned int rflags)
{
size_t orig_offset = offset;
size_t padding;
padding = ltt_align(offset, sizeof(struct ltt_event_header));
offset += padding;
offset += sizeof(struct ltt_event_header);
if(unlikely(rflags)) {
switch (rflags) {
case LTT_RFLAG_ID_SIZE_TSC:
offset += sizeof(u16) + sizeof(u16);
if (data_size >= 0xFFFFU)
offset += sizeof(u32);
offset += ltt_align(offset, sizeof(u64));
offset += sizeof(u64);
break;
case LTT_RFLAG_ID_SIZE:
offset += sizeof(u16) + sizeof(u16);
if (data_size >= 0xFFFFU)
offset += sizeof(u32);
break;
case LTT_RFLAG_ID:
offset += sizeof(u16);
break;
}
}
*before_hdr_pad = padding;
return offset - orig_offset;
}
#endif /* UST_HEADER_INLINE_H */
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