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[fdt] Provide fdt_strings() to read string list properties

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-04-14 11:32:17 +01:00
parent 69af6f0c30
commit c887de208f
2 changed files with 45 additions and 14 deletions
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57
src/core/fdt.c
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@@ -402,6 +402,46 @@ static int fdt_property ( struct fdt *fdt, unsigned int offset,
}
}
/**
* Find strings property
*
* @v fdt Device tree
* @v offset Starting node offset
* @v name Property name
* @v count String count to fill in
* @ret string String property, or NULL on error
*/
const char * fdt_strings ( struct fdt *fdt, unsigned int offset,
const char *name, unsigned int *count ) {
struct fdt_descriptor desc;
const char *data;
size_t len;
int rc;
/* Return a zero count on error */
*count = 0;
/* Find property */
if ( ( rc = fdt_property ( fdt, offset, name, &desc ) ) != 0 )
return NULL;
/* Check NUL termination */
data = desc.data;
if ( desc.len && ( data[ desc.len - 1 ] != '\0' ) ) {
DBGC ( fdt, "FDT unterminated string property \"%s\"\n",
name );
return NULL;
}
/* Count number of strings */
for ( len = desc.len ; len-- ; ) {
if ( data[len] == '\0' )
(*count)++;
}
return data;
}
/**
* Find string property
*
@@ -412,21 +452,10 @@ static int fdt_property ( struct fdt *fdt, unsigned int offset,
*/
const char * fdt_string ( struct fdt *fdt, unsigned int offset,
const char *name ) {
struct fdt_descriptor desc;
int rc;
unsigned int count;
/* Find property */
if ( ( rc = fdt_property ( fdt, offset, name, &desc ) ) != 0 )
return NULL;
/* Check NUL termination */
if ( strnlen ( desc.data, desc.len ) == desc.len ) {
DBGC ( fdt, "FDT unterminated string property \"%s\"\n",
name );
return NULL;
}
return desc.data;
/* Find strings property */
return fdt_strings ( fdt, offset, name, &count );
}
/**

2
src/include/ipxe/fdt.h
View File

@@ -115,6 +115,8 @@ extern int fdt_path ( struct fdt *fdt, const char *path,
unsigned int *offset );
extern int fdt_alias ( struct fdt *fdt, const char *name,
unsigned int *offset );
extern const char * fdt_strings ( struct fdt *fdt, unsigned int offset,
const char *name, unsigned int *count );
extern const char * fdt_string ( struct fdt *fdt, unsigned int offset,
const char *name );
extern int fdt_u64 ( struct fdt *fdt, unsigned int offset, const char *name,