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libfdt: Add function to resize the buffer for a sequential write tree

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At present, when using sequential write mode, there's no straightforward
means of resizing the buffer the fdt is being built into.  This patch
adds an fdt_resize() function for this purpose.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson 2013-10-26 00:17:37 +11:00
parent 883238dc50
commit 79eebb23db
4 changed files with 114 additions and 8 deletions
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32
libfdt/fdt_sw.c
View file

@ -107,6 +107,38 @@ int fdt_create(void *buf, int bufsize)
return 0;
}
int fdt_resize(void *fdt, void *buf, int bufsize)
{
size_t headsize, tailsize;
char *oldtail, *newtail;
FDT_SW_CHECK_HEADER(fdt);
headsize = fdt_off_dt_struct(fdt);
tailsize = fdt_size_dt_strings(fdt);
if ((headsize + tailsize) > bufsize)
return -FDT_ERR_NOSPACE;
oldtail = (char *)fdt + fdt_totalsize(fdt) - tailsize;
newtail = (char *)buf + bufsize - tailsize;
/* Two cases to avoid clobbering data if the old and new
* buffers partially overlap */
if (buf <= fdt) {
memmove(buf, fdt, headsize);
memmove(newtail, oldtail, tailsize);
} else {
memmove(newtail, oldtail, tailsize);
memmove(buf, fdt, headsize);
}
fdt_set_off_dt_strings(buf, bufsize);
fdt_set_totalsize(buf, bufsize);
return 0;
}
int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size)
{
struct fdt_reserve_entry *re;

1
libfdt/libfdt.h
View file

@ -1023,6 +1023,7 @@ int fdt_nop_node(void *fdt, int nodeoffset);
/**********************************************************************/
int fdt_create(void *buf, int bufsize);
int fdt_resize(void *fdt, void *buf, int bufsize);
int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size);
int fdt_finish_reservemap(void *fdt);
int fdt_begin_node(void *fdt, const char *name);