treewide: Add a function to change page permissions

For armv8 we are adding proper page permissions for the relocated U-Boot
binary. Add a weak function that can be used across architectures to change
the page permissions

Tested-by: Neil Armstrong <[email protected]> # on AML-S905X-CC
Signed-off-by: Ilias Apalodimas <[email protected]>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/cpu_func.h b/include/cpu_func.h
index 7e81c4364a7..70a41ead3f7 100644
--- a/include/cpu_func.h
+++ b/include/cpu_func.h
@@ -69,6 +69,23 @@ void flush_dcache_range(unsigned long start, unsigned long stop);
 void invalidate_dcache_range(unsigned long start, unsigned long stop);
 void invalidate_dcache_all(void);
 void invalidate_icache_all(void);
+
+enum pgprot_attrs {
+	MMU_ATTR_RO,
+	MMU_ATTR_RX,
+	MMU_ATTR_RW,
+};
+
+/** pgprot_set_attrs() - Set page table permissions
+ *
+ * @addr: Physical address start
+ * @size: size of memory to change
+ * @perm: New permissions
+ *
+ * Return: 0 on success, error otherwise.
+ **/
+int pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm);
+
 /**
  * noncached_init() - Initialize non-cached memory region
  *