mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-24 19:08:50 +09:00
![Gerald Van Baren](/assets/img/avatar_default.png)
Enhanced the formerly private function _fdt_next_tag() to allow stepping through the tree, used to produce a human-readable dump, and made it part of the published interface. Also added some comments.
227 lines
5.5 KiB
C
227 lines
5.5 KiB
C
/*
|
|
* libfdt - Flat Device Tree manipulation
|
|
* Copyright (C) 2006 David Gibson, IBM Corporation.
|
|
*
|
|
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include "libfdt_env.h"
|
|
|
|
#include <fdt.h>
|
|
#include <libfdt.h>
|
|
|
|
#include "libfdt_internal.h"
|
|
|
|
static int check_header_sw(void *fdt)
|
|
{
|
|
if (fdt_magic(fdt) != SW_MAGIC)
|
|
return -FDT_ERR_BADMAGIC;
|
|
return 0;
|
|
}
|
|
|
|
static void *grab_space(void *fdt, int len)
|
|
{
|
|
int offset = fdt_size_dt_struct(fdt);
|
|
int spaceleft;
|
|
|
|
spaceleft = fdt_totalsize(fdt) - fdt_off_dt_struct(fdt)
|
|
- fdt_size_dt_strings(fdt);
|
|
|
|
if ((offset + len < offset) || (offset + len > spaceleft))
|
|
return NULL;
|
|
|
|
fdt_set_header(fdt, size_dt_struct, offset + len);
|
|
return fdt_offset_ptr(fdt, offset, len);
|
|
}
|
|
|
|
int fdt_create(void *buf, int bufsize)
|
|
{
|
|
void *fdt = buf;
|
|
|
|
if (bufsize < sizeof(struct fdt_header))
|
|
return -FDT_ERR_NOSPACE;
|
|
|
|
memset(buf, 0, bufsize);
|
|
|
|
fdt_set_header(fdt, magic, SW_MAGIC);
|
|
fdt_set_header(fdt, version, FDT_LAST_SUPPORTED_VERSION);
|
|
fdt_set_header(fdt, last_comp_version, FDT_FIRST_SUPPORTED_VERSION);
|
|
fdt_set_header(fdt, totalsize, bufsize);
|
|
|
|
fdt_set_header(fdt, off_mem_rsvmap, ALIGN(sizeof(struct fdt_header),
|
|
sizeof(struct fdt_reserve_entry)));
|
|
fdt_set_header(fdt, off_dt_struct, fdt_off_mem_rsvmap(fdt));
|
|
fdt_set_header(fdt, off_dt_strings, bufsize);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size)
|
|
{
|
|
struct fdt_reserve_entry *re;
|
|
int err = check_header_sw(fdt);
|
|
int offset;
|
|
|
|
if (err)
|
|
return err;
|
|
if (fdt_size_dt_struct(fdt))
|
|
return -FDT_ERR_BADSTATE;
|
|
|
|
offset = fdt_off_dt_struct(fdt);
|
|
if ((offset + sizeof(*re)) > fdt_totalsize(fdt))
|
|
return -FDT_ERR_NOSPACE;
|
|
|
|
re = (struct fdt_reserve_entry *)((void *)fdt + offset);
|
|
re->address = cpu_to_fdt64(addr);
|
|
re->size = cpu_to_fdt64(size);
|
|
|
|
fdt_set_header(fdt, off_dt_struct, offset + sizeof(*re));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int fdt_finish_reservemap(void *fdt)
|
|
{
|
|
return fdt_add_reservemap_entry(fdt, 0, 0);
|
|
}
|
|
|
|
int fdt_begin_node(void *fdt, const char *name)
|
|
{
|
|
struct fdt_node_header *nh;
|
|
int err = check_header_sw(fdt);
|
|
int namelen = strlen(name) + 1;
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
nh = grab_space(fdt, sizeof(*nh) + ALIGN(namelen, FDT_TAGSIZE));
|
|
if (! nh)
|
|
return -FDT_ERR_NOSPACE;
|
|
|
|
nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
|
|
memcpy(nh->name, name, namelen);
|
|
return 0;
|
|
}
|
|
|
|
int fdt_end_node(void *fdt)
|
|
{
|
|
uint32_t *en;
|
|
int err = check_header_sw(fdt);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
en = grab_space(fdt, FDT_TAGSIZE);
|
|
if (! en)
|
|
return -FDT_ERR_NOSPACE;
|
|
|
|
*en = cpu_to_fdt32(FDT_END_NODE);
|
|
return 0;
|
|
}
|
|
|
|
static int find_add_string(void *fdt, const char *s)
|
|
{
|
|
char *strtab = (char *)fdt + fdt_totalsize(fdt);
|
|
const char *p;
|
|
int strtabsize = fdt_size_dt_strings(fdt);
|
|
int len = strlen(s) + 1;
|
|
int struct_top, offset;
|
|
|
|
p = _fdt_find_string(strtab - strtabsize, strtabsize, s);
|
|
if (p)
|
|
return p - strtab;
|
|
|
|
/* Add it */
|
|
offset = -strtabsize - len;
|
|
struct_top = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
|
|
if (fdt_totalsize(fdt) + offset < struct_top)
|
|
return 0; /* no more room :( */
|
|
|
|
memcpy(strtab + offset, s, len);
|
|
fdt_set_header(fdt, size_dt_strings, strtabsize + len);
|
|
return offset;
|
|
}
|
|
|
|
int fdt_property(void *fdt, const char *name, const void *val, int len)
|
|
{
|
|
struct fdt_property *prop;
|
|
int err = check_header_sw(fdt);
|
|
int nameoff;
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
nameoff = find_add_string(fdt, name);
|
|
if (nameoff == 0)
|
|
return -FDT_ERR_NOSPACE;
|
|
|
|
prop = grab_space(fdt, sizeof(*prop) + ALIGN(len, FDT_TAGSIZE));
|
|
if (! prop)
|
|
return -FDT_ERR_NOSPACE;
|
|
|
|
prop->tag = cpu_to_fdt32(FDT_PROP);
|
|
prop->nameoff = cpu_to_fdt32(nameoff);
|
|
prop->len = cpu_to_fdt32(len);
|
|
memcpy(prop->data, val, len);
|
|
return 0;
|
|
}
|
|
|
|
int fdt_finish(void *fdt)
|
|
{
|
|
int err = check_header_sw(fdt);
|
|
char *p = (char *)fdt;
|
|
uint32_t *end;
|
|
int oldstroffset, newstroffset;
|
|
uint32_t tag;
|
|
int offset, nextoffset;
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
/* Add terminator */
|
|
end = grab_space(fdt, sizeof(*end));
|
|
if (! end)
|
|
return -FDT_ERR_NOSPACE;
|
|
*end = cpu_to_fdt32(FDT_END);
|
|
|
|
/* Relocate the string table */
|
|
oldstroffset = fdt_totalsize(fdt) - fdt_size_dt_strings(fdt);
|
|
newstroffset = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
|
|
memmove(p + newstroffset, p + oldstroffset, fdt_size_dt_strings(fdt));
|
|
fdt_set_header(fdt, off_dt_strings, newstroffset);
|
|
|
|
/* Walk the structure, correcting string offsets */
|
|
offset = 0;
|
|
while ((tag = fdt_next_tag(fdt, offset, &nextoffset, NULL)) != FDT_END) {
|
|
if (tag == FDT_PROP) {
|
|
struct fdt_property *prop = fdt_offset_ptr(fdt, offset,
|
|
sizeof(*prop));
|
|
int nameoff;
|
|
|
|
if (! prop)
|
|
return -FDT_ERR_BADSTRUCTURE;
|
|
|
|
nameoff = fdt32_to_cpu(prop->nameoff);
|
|
nameoff += fdt_size_dt_strings(fdt);
|
|
prop->nameoff = cpu_to_fdt32(nameoff);
|
|
}
|
|
offset = nextoffset;
|
|
}
|
|
|
|
/* Finally, adjust the header */
|
|
fdt_set_header(fdt, totalsize, newstroffset + fdt_size_dt_strings(fdt));
|
|
fdt_set_header(fdt, magic, FDT_MAGIC);
|
|
return 0;
|
|
}
|