memory: reserve from start_addr_sp to initial_relocaddr

Add a new global data struct member called initial_relocaddr. This
stores the original value of relocaddr, directly from setup_dest_addr.
This is specifically to avoid any adjustments made by other init
functions.

Reserve the memory from gd->start_addr_sp - CONFIG_STACK_SIZE to
gd->initial_relocaddr instead of gd->ram_top. This allows platform
specific relocation addresses to work without unnecessarily painting
over a large range.

Signed-off-by: Randolph Sapp <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index 745d2c3a966..8d1d49b1133 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -108,6 +108,15 @@ struct global_data {
 	 */
 	unsigned long relocaddr;
 	/**
+	 * @initial_relocaddr: top address of U-Boot in RAM
+	 *
+	 * This should be the value of relocaddr after setup_dest_addr() and
+	 * before reserve_pram() or any other allocations or reservations shift
+	 * it. This address will, depending on the platform, be equivalent to
+	 * ram_top and should also be considered an exclusive address.
+	 */
+	unsigned long initial_relocaddr;
+	/**
 	 * @irq_sp: IRQ stack pointer
 	 */
 	unsigned long irq_sp;