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libfdt: Add fdt_find_regions()

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Add a function to find regions in device tree given a list of nodes to
include and properties to exclude.

See the header file for full documentation.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2013-06-13 15:10:08 -07:00 • committed by Tom Rini
parent 399c744b22
commit 3e06cd1f97
2 changed files with 193 additions and 0 deletions
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129
lib/libfdt/fdt_wip.c
View file

@ -120,3 +120,132 @@ int fdt_nop_node(void *fdt, int nodeoffset)
endoffset - nodeoffset);
return 0;
}
#define FDT_MAX_DEPTH 32
static int str_in_list(const char *str, char * const list[], int count)
{
int i;
for (i = 0; i < count; i++)
if (!strcmp(list[i], str))
return 1;
return 0;
}
int fdt_find_regions(const void *fdt, char * const inc[], int inc_count,
char * const exc_prop[], int exc_prop_count,
struct fdt_region region[], int max_regions,
char *path, int path_len, int add_string_tab)
{
int stack[FDT_MAX_DEPTH];
char *end;
int nextoffset = 0;
uint32_t tag;
int count = 0;
int start = -1;
int depth = -1;
int want = 0;
int base = fdt_off_dt_struct(fdt);
end = path;
*end = '\0';
do {
const struct fdt_property *prop;
const char *name;
const char *str;
int include = 0;
int stop_at = 0;
int offset;
int len;
offset = nextoffset;
tag = fdt_next_tag(fdt, offset, &nextoffset);
stop_at = nextoffset;
switch (tag) {
case FDT_PROP:
include = want >= 2;
stop_at = offset;
prop = fdt_get_property_by_offset(fdt, offset, NULL);
str = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
if (str_in_list(str, exc_prop, exc_prop_count))
include = 0;
break;
case FDT_NOP:
include = want >= 2;
stop_at = offset;
break;
case FDT_BEGIN_NODE:
depth++;
if (depth == FDT_MAX_DEPTH)
return -FDT_ERR_BADSTRUCTURE;
name = fdt_get_name(fdt, offset, &len);
if (end - path + 2 + len >= path_len)
return -FDT_ERR_NOSPACE;
if (end != path + 1)
*end++ = '/';
strcpy(end, name);
end += len;
stack[depth] = want;
if (want == 1)
stop_at = offset;
if (str_in_list(path, inc, inc_count))
want = 2;
else if (want)
want--;
else
stop_at = offset;
include = want;
break;
case FDT_END_NODE:
include = want;
want = stack[depth--];
while (end > path && *--end != '/')
;
*end = '\0';
break;
case FDT_END:
include = 1;
break;
}
if (include && start == -1) {
/* Should we merge with previous? */
if (count && count <= max_regions &&
offset == region[count - 1].offset +
region[count - 1].size - base)
start = region[--count].offset - base;
else
start = offset;
}
if (!include && start != -1) {
if (count < max_regions) {
region[count].offset = base + start;
region[count].size = stop_at - start;
}
count++;
start = -1;
}
} while (tag != FDT_END);
if (nextoffset != fdt_size_dt_struct(fdt))
return -FDT_ERR_BADLAYOUT;
/* Add a region for the END tag and the string table */
if (count < max_regions) {
region[count].offset = base + start;
region[count].size = nextoffset - start;
if (add_string_tab)
region[count].size += fdt_size_dt_strings(fdt);
}
count++;
return count;
}