Various improvements/cleanups on the linker scripts
- Check at link-time that bootloader images will fit in memory
at run time and that they won't overlap each other.
- Remove text and rodata orphan sections.
- Define new linker symbols to remove the need for platform setup
code to know the order of sections.
- Reduce the size of the raw binary images by cutting some sections
out of the disk image and allocating them at load time, whenever
possible.
- Rework alignment constraints on sections.
- Remove unused linker symbols.
- Homogenize linker symbols names across all BLs.
- Add some comments in the linker scripts.
Change-Id: I47a328af0ccc7c8ab47fcc0dc6e7dd26160610b9
diff --git a/plat/fvp/bl31_plat_setup.c b/plat/fvp/bl31_plat_setup.c
index 0dd5c69..47b6d5b 100644
--- a/plat/fvp/bl31_plat_setup.c
+++ b/plat/fvp/bl31_plat_setup.c
@@ -44,20 +44,30 @@
* Declarations of linker defined symbols which will help us find the layout
* of trusted SRAM
******************************************************************************/
-#if defined (__GNUC__)
-extern unsigned long __BL31_RO_BASE__;
-extern unsigned long __BL31_STACKS_BASE__;
-extern unsigned long __BL31_COHERENT_RAM_BASE__;
-extern unsigned long __BL31_RW_BASE__;
+extern unsigned long __RO_START__;
+extern unsigned long __RO_END__;
-#define BL31_RO_BASE __BL31_RO_BASE__
-#define BL31_STACKS_BASE __BL31_STACKS_BASE__
-#define BL31_COHERENT_RAM_BASE __BL31_COHERENT_RAM_BASE__
-#define BL31_RW_BASE __BL31_RW_BASE__
+extern unsigned long __COHERENT_RAM_START__;
+extern unsigned long __COHERENT_RAM_END__;
-#else
- #error "Unknown compiler."
-#endif
+/*
+ * The next 2 constants identify the extents of the code & RO data region.
+ * These addresses are used by the MMU setup code and therefore they must be
+ * page-aligned. It is the responsibility of the linker script to ensure that
+ * __RO_START__ and __RO_END__ linker symbols refer to page-aligned addresses.
+ */
+#define BL31_RO_BASE (unsigned long)(&__RO_START__)
+#define BL31_RO_LIMIT (unsigned long)(&__RO_END__)
+
+/*
+ * The next 2 constants identify the extents of the coherent memory region.
+ * These addresses are used by the MMU setup code and therefore they must be
+ * page-aligned. It is the responsibility of the linker script to ensure that
+ * __COHERENT_RAM_START__ and __COHERENT_RAM_END__ linker symbols
+ * refer to page-aligned addresses.
+ */
+#define BL31_COHERENT_RAM_BASE (unsigned long)(&__COHERENT_RAM_START__)
+#define BL31_COHERENT_RAM_LIMIT (unsigned long)(&__COHERENT_RAM_END__)
/*******************************************************************************
* This data structures holds information copied by BL31 from BL2 to pass
@@ -167,10 +177,10 @@
void bl31_plat_arch_setup()
{
configure_mmu(&bl31_tzram_layout,
- (unsigned long) &BL31_RO_BASE,
- (unsigned long) &BL31_STACKS_BASE,
- (unsigned long) &BL31_COHERENT_RAM_BASE,
- (unsigned long) &BL31_RW_BASE);
+ BL31_RO_BASE,
+ BL31_RO_LIMIT,
+ BL31_COHERENT_RAM_BASE,
+ BL31_COHERENT_RAM_LIMIT);
}
/*******************************************************************************