feat(scripts): generate data memory derived macros

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

Author: danielRep

scripts/config_defs_gen.c

@@ -36,6 +36,12 @@ int main() {
         printf("#define CONFIG_HYP_BASE_ADDR PLAT_BASE_ADDR\n");
     }
 
+    if(config.hyp.data_relocate) {
+        printf("#define CONFIG_HYP_DATA_ADDR (0x%lx)\n", config.hyp.data_addr);
+    } else {
+        printf("#define CONFIG_HYP_DATA_ADDR PLAT_DATA_ADDR\n");
+    }
+
     printf("#define CONFIG_REMIO_DEV_NUM %ld\n", remio_dev_num());
 
     return 0;

scripts/platform_defs_gen.c

@@ -18,6 +18,20 @@ 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_ADDR. This region is considered the main data memory that Bao will use
+         * for its own purposes.
+         */
+        if(platform.regions[i].perms == MEM_RWX)
+        {
+            printf("#define PLAT_DATA_ADDR (0x%lx)\n", platform.regions[i].base);
+            break;
+        }
+    }
+
     for(size_t i = 0; i < platform.region_num; i++)
     {
         size_t reg_size;

src/core/inc/config.h

@@ -110,6 +110,15 @@ extern struct config {
         bool relocate;
         paddr_t base_addr;
 
+        /**
+         * Only meaningful for non-unified platforms. In such platforms, the hypervisor expects a
+         * base address for data memory and will default to the first RWX region defined in the
+         * target platform's description. If the user wishes to relocate it to another address,
+         * they must set data_relocate to true and provide the new base address.
+         */
+        bool data_relocate;
+        paddr_t data_addr;
+
         /* Hypervisor colors */
         colormap_t colors;
     } hyp;