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/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __HDIF_H
#define __HDIF_H
#include <skiboot.h>
#include <types.h>
#include <ccan/endian/endian.h>
struct HDIF_common_hdr {
__be16 d1f0; /* 0xd1f0 */
char id[6]; /* eye catcher string */
__be16 instnum; /* instance number */
__be16 version; /* version */
__be32 total_len; /* total structure length */
__be32 hdr_len; /* header length (currently 0x20) */
__be32 idptr_off; /* offset to idata pointers */
__be16 idptr_count; /* number of idata pointers */
__be16 child_count; /* number of child structures */
__be32 child_off; /* offset to child structures array */
} __packed __align(0x10);
struct HDIF_idata_ptr {
__be32 offset;
__be32 size;
} __packed __align(0x8);
struct HDIF_array_hdr {
__be32 offset;
__be32 ecnt;
__be32 esize;
__be32 eactsz;
} __packed __align(0x10);
struct HDIF_child_ptr {
__be32 offset;
__be32 size;
__be32 count;
} __packed;
#define HDIF_HDR_LEN (sizeof(struct HDIF_common_hdr))
#define HDIF_ARRAY_OFFSET (sizeof(struct HDIF_array_hdr))
#define HDIF_ID(_id) .d1f0 = CPU_TO_BE16(0xd1f0), .id = _id
#define HDIF_SIMPLE_HDR(id, vers, type) \
{ \
HDIF_ID(id), \
.instnum = CPU_TO_BE16(0), \
.version = CPU_TO_BE16(vers), \
.total_len = CPU_TO_BE32(sizeof(type)), \
.hdr_len = CPU_TO_BE32(HDIF_HDR_LEN), \
.idptr_off = CPU_TO_BE32(HDIF_HDR_LEN), \
.idptr_count = CPU_TO_BE16(1), \
.child_count = CPU_TO_BE16(0), \
.child_off = CPU_TO_BE32(0), \
}
#define HDIF_IDATA_PTR(_offset, _size) \
{ \
.offset = CPU_TO_BE32(_offset), \
.size = CPU_TO_BE32(_size), \
}
static inline bool HDIF_check(const void *hdif, const char id[])
{
const struct HDIF_common_hdr *hdr = hdif;
return hdr->d1f0 == CPU_TO_BE16(0xd1f0) &&
memcmp(hdr->id, id, sizeof(hdr->id)) == 0;
}
/* HDIF_get_idata - Get a pointer to internal data block
*
* @hdif : HDIF structure pointer
* @di : Index of the idata pointer
* @size : Return the data size (or NULL if ignored)
*/
extern const void *HDIF_get_idata(const struct HDIF_common_hdr *hdif,
unsigned int di,
unsigned int *size);
/* HDIF_get_iarray - Get a pointer to an elemnt of an internal data array
*
* @hdif : HDIF structure pointer
* @di : Index of the idata pointer
* @ai : Index in the resulting array
* @size : Return the entry actual size (or NULL if ignored)
*/
extern const void *HDIF_get_iarray_item(const struct HDIF_common_hdr *hdif,
unsigned int di,
unsigned int ai, unsigned int *size);
/* HDIF_get_iarray_size - Get the number of elements of an internal data array
*
* @hdif : HDIF structure pointer
* @di : Index of the idata pointer
*
* A negative result means an error
*/
extern int HDIF_get_iarray_size(const struct HDIF_common_hdr *hdif,
unsigned int di);
/* HDIF_child_arr - Get a child array from this HDIF.
*
* @hdif : HDIF structure pointer
* @idx : the child to get
*
* NULL means an error (not that many children).
*/
extern struct HDIF_child_ptr *
HDIF_child_arr(const struct HDIF_common_hdr *hdif, unsigned int idx);
/* HDIF_child - Deref a child_ptr entry.
*
* @hdif : HDIF structure pointer
* @child : the child returned from HDIF_child_arr
* @idx : the index of the child to get (< child->count).
* @eyecatcher: the 6-char ID expected for this child.
*
* NULL means an error.
*/
extern struct HDIF_common_hdr *HDIF_child(const struct HDIF_common_hdr *hdif,
const struct HDIF_child_ptr *child,
unsigned int idx,
const char *eyecatcher);
#endif /* __HDIF_H */
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