Properly initialise the C runtime environment
This patch makes sure the C runtime environment is properly
initialised before executing any C code.
- Zero-initialise NOBITS sections (e.g. the bss section).
- Relocate BL1 data from ROM to RAM.
Change-Id: I0da81b417b2f0d1f7ef667cc5131b1e47e22571f
diff --git a/bl1/aarch64/bl1_entrypoint.S b/bl1/aarch64/bl1_entrypoint.S
index 7fe3bc6..119ae93 100644
--- a/bl1/aarch64/bl1_entrypoint.S
+++ b/bl1/aarch64/bl1_entrypoint.S
@@ -93,6 +93,30 @@
_do_cold_boot:
/* ---------------------------------------------
+ * Init C runtime environment.
+ * - Zero-initialise the NOBITS sections.
+ * There are 2 of them:
+ * - the .bss section;
+ * - the coherent memory section.
+ * - Copy the data section from BL1 image
+ * (stored in ROM) to the correct location
+ * in RAM.
+ * ---------------------------------------------
+ */
+ ldr x0, =__BSS_START__
+ ldr x1, =__BSS_SIZE__
+ bl zeromem16
+
+ ldr x0, =__COHERENT_RAM_START__
+ ldr x1, =__COHERENT_RAM_UNALIGNED_SIZE__
+ bl zeromem16
+
+ ldr x0, =__DATA_RAM_START__
+ ldr x1, =__DATA_ROM_START__
+ ldr x2, =__DATA_SIZE__
+ bl memcpy16
+
+ /* ---------------------------------------------
* Initialize platform and jump to our c-entry
* point for this type of reset
* ---------------------------------------------