feat(mem): add perms to mem regions

Signed-off-by: Daniel Oliveira <[email protected]>

Author: danielRep

scripts/platform_defs_gen.c

@@ -14,6 +14,20 @@ int main() {
 
     printf("#define PLAT_CPU_NUM (%ld)\n", platform.cpu_num);
     printf("#define PLAT_BASE_ADDR (0x%lx)\n", platform.regions[0].base);
+
+    for(size_t i = 1; i < platform.region_num; i++)
+    {
+        /*
+         * Selects the first memory region with RWX (read, write, execute) permissions, and defines
+         * it as PLAT_DATA_MEM. This region is considered the main data memory that Bao will use
+         * for its own purposes.
+         */
+        if(platform.regions[i].perms == RWX)
+        {
+            printf("#define PLAT_DATA_MEM (0x%lx)\n", platform.regions[i].base);
+            break;
+        }
+    }
     if (platform.cpu_master_fixed) {
         printf("#define CPU_MASTER_FIXED (%ld)\n", platform.cpu_master);
     }

src/core/inc/mem.h

@@ -15,6 +15,11 @@
 
 #ifndef __ASSEMBLER__
 
+enum MEM_PERMISSIONS {
+    RWX,
+    RX,
+};
+
 struct ppages {
     paddr_t base;
     size_t num_pages;
@@ -34,6 +39,7 @@ struct page_pool {
 struct mem_region {
     paddr_t base;
     size_t size;
+    enum MEM_PERMISSIONS perms;
     struct page_pool page_pool;
 };