fdtdec: optionally add property no-map to created reserved memory node
Add boolean input argument @no_map to helper function
fdtdec_add_reserved_memory() to add or not "no-map" property
for an added reserved memory node.
Property no-map is used by the Linux kernel to not not map memory
in its static memory mapping. It is needed for example for the|
consistency of system non-cached memory and to prevent speculative
accesses to some firewalled memory.
No functional change. A later change will update to OPTEE library to
add no-map property to OP-TEE reserved memory nodes.
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 56bf9fc..b8fc5e2 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -1316,7 +1316,7 @@
int fdtdec_add_reserved_memory(void *blob, const char *basename,
const struct fdt_memory *carveout,
- uint32_t *phandlep)
+ uint32_t *phandlep, bool no_map)
{
fdt32_t cells[4] = {}, *ptr = cells;
uint32_t upper, lower, phandle;
@@ -1416,6 +1416,12 @@
if (err < 0)
return err;
+ if (no_map) {
+ err = fdt_setprop(blob, node, "no-map", NULL, 0);
+ if (err < 0)
+ return err;
+ }
+
/* return the phandle for the new node for the caller to use */
if (phandlep)
*phandlep = phandle;
@@ -1481,7 +1487,7 @@
fdt32_t value;
void *prop;
- err = fdtdec_add_reserved_memory(blob, name, carveout, &phandle);
+ err = fdtdec_add_reserved_memory(blob, name, carveout, &phandle, false);
if (err < 0) {
debug("failed to add reserved memory: %d\n", err);
return err;