FDT wrappers: add functions for read/write bytes
This patch adds 'fdtw_read_bytes' and 'fdtw_write_inplace_bytes'
functions for read/write array of bytes from/to a given property.
It also adds 'fdt_setprop_inplace_namelen_partial' to jmptbl.i
files for builds with USE_ROMLIB=1 option.
Change-Id: Ied7b5c8b38a0e21d508aa7bcf5893e656028b14d
Signed-off-by: Alexei Fedorov <Alexei.Fedorov@arm.com>
diff --git a/common/fdt_wrappers.c b/common/fdt_wrappers.c
index e67fdb0..ca5b455 100644
--- a/common/fdt_wrappers.c
+++ b/common/fdt_wrappers.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -103,6 +103,41 @@
}
/*
+ * Read bytes from a given property of the given node. Any number of
+ * bytes of the property can be read. The fdt pointer is updated.
+ * Returns 0 on success, and -1 on error.
+ */
+int fdtw_read_bytes(const void *dtb, int node, const char *prop,
+ unsigned int length, void *value)
+{
+ const void *ptr;
+ int value_len;
+
+ assert(dtb != NULL);
+ assert(prop != NULL);
+ assert(value != NULL);
+ assert(node >= 0);
+
+ /* Access property and obtain its length (in bytes) */
+ ptr = fdt_getprop_namelen(dtb, node, prop, (int)strlen(prop),
+ &value_len);
+ if (ptr == NULL) {
+ WARN("Couldn't find property %s in dtb\n", prop);
+ return -1;
+ }
+
+ /* Verify that property length is not less than number of bytes */
+ if ((unsigned int)value_len < length) {
+ WARN("Property length mismatch\n");
+ return -1;
+ }
+
+ (void)memcpy(value, ptr, length);
+
+ return 0;
+}
+
+/*
* Read string from a given property of the given node. Up to 'size - 1'
* characters are read, and a NUL terminator is added. Returns 0 on success,
* and -1 upon error.
@@ -167,3 +202,45 @@
return 0;
}
+
+/*
+ * Write bytes in place to a given property of the given node.
+ * Any number of bytes of the property can be written.
+ * Returns 0 on success, and < 0 on error.
+ */
+int fdtw_write_inplace_bytes(void *dtb, int node, const char *prop,
+ unsigned int length, const void *data)
+{
+ const void *ptr;
+ int namelen, value_len, err;
+
+ assert(dtb != NULL);
+ assert(prop != NULL);
+ assert(data != NULL);
+ assert(node >= 0);
+
+ namelen = (int)strlen(prop);
+
+ /* Access property and obtain its length in bytes */
+ ptr = fdt_getprop_namelen(dtb, node, prop, namelen, &value_len);
+ if (ptr == NULL) {
+ WARN("Couldn't find property %s in dtb\n", prop);
+ return -1;
+ }
+
+ /* Verify that property length is not less than number of bytes */
+ if ((unsigned int)value_len < length) {
+ WARN("Property length mismatch\n");
+ return -1;
+ }
+
+ /* Set property value in place */
+ err = fdt_setprop_inplace_namelen_partial(dtb, node, prop,
+ namelen, 0,
+ data, (int)length);
+ if (err != 0) {
+ WARN("Set property %s failed with error %d\n", prop, err);
+ }
+
+ return err;
+}
diff --git a/include/common/fdt_wrappers.h b/include/common/fdt_wrappers.h
index 79d001d..f467958 100644
--- a/include/common/fdt_wrappers.h
+++ b/include/common/fdt_wrappers.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -20,5 +20,9 @@
char *str, size_t size);
int fdtw_write_inplace_cells(void *dtb, int node, const char *prop,
unsigned int cells, void *value);
+int fdtw_read_bytes(const void *dtb, int node, const char *prop,
+ unsigned int length, void *value);
+int fdtw_write_inplace_bytes(void *dtb, int node, const char *prop,
+ unsigned int length, const void *data);
#endif /* FDT_WRAPPERS_H */
diff --git a/lib/romlib/jmptbl.i b/lib/romlib/jmptbl.i
index a7280d0..33710f5 100644
--- a/lib/romlib/jmptbl.i
+++ b/lib/romlib/jmptbl.i
@@ -1,5 +1,5 @@
#
-# Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
#
@@ -17,6 +17,7 @@
fdt fdt_setprop_inplace
fdt fdt_check_header
fdt fdt_node_offset_by_compatible
+fdt fdt_setprop_inplace_namelen_partial
mbedtls mbedtls_asn1_get_alg
mbedtls mbedtls_asn1_get_alg_null
mbedtls mbedtls_asn1_get_bitstring_null
diff --git a/plat/arm/board/fvp/jmptbl.i b/plat/arm/board/fvp/jmptbl.i
index bfa9b56..6ccdd28 100644
--- a/plat/arm/board/fvp/jmptbl.i
+++ b/plat/arm/board/fvp/jmptbl.i
@@ -1,5 +1,5 @@
#
-# Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
#
@@ -19,6 +19,7 @@
fdt fdt_setprop_inplace
fdt fdt_check_header
fdt fdt_node_offset_by_compatible
+fdt fdt_setprop_inplace_namelen_partial
mbedtls mbedtls_asn1_get_alg
mbedtls mbedtls_asn1_get_alg_null
mbedtls mbedtls_asn1_get_bitstring_null
diff --git a/plat/arm/board/juno/jmptbl.i b/plat/arm/board/juno/jmptbl.i
index bfa9b56..6ccdd28 100644
--- a/plat/arm/board/juno/jmptbl.i
+++ b/plat/arm/board/juno/jmptbl.i
@@ -1,5 +1,5 @@
#
-# Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
#
@@ -19,6 +19,7 @@
fdt fdt_setprop_inplace
fdt fdt_check_header
fdt fdt_node_offset_by_compatible
+fdt fdt_setprop_inplace_namelen_partial
mbedtls mbedtls_asn1_get_alg
mbedtls mbedtls_asn1_get_alg_null
mbedtls mbedtls_asn1_get_bitstring_null