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-rw-r--r--common/spl/spl.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/common/spl/spl.c b/common/spl/spl.c
index ded0f30478..cd75bbc4ce 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -281,3 +281,38 @@ void preloader_console_init(void)
spl_display_print();
#endif
}
+
+/**
+ * spl_relocate_stack_gd() - Relocate stack ready for board_init_r() execution
+ *
+ * Sometimes board_init_f() runs with a stack in SRAM but we want to use SDRAM
+ * for the main board_init_r() execution. This is typically because we need
+ * more stack space for things like the MMC sub-system.
+ *
+ * This function calculates the stack position, copies the global_data into
+ * place and returns the new stack position. The caller is responsible for
+ * setting up the sp register.
+ *
+ * @return new stack location, or 0 to use the same stack
+ */
+ulong spl_relocate_stack_gd(void)
+{
+#ifdef CONFIG_SPL_STACK_R
+ gd_t *new_gd;
+ ulong ptr;
+
+ /* Get stack position: use 8-byte alignment for ABI compliance */
+ ptr = CONFIG_SPL_STACK_R - sizeof(gd_t);
+ ptr &= ~7;
+ new_gd = (gd_t *)ptr;
+ memcpy(new_gd, (void *)gd, sizeof(gd_t));
+ gd = new_gd;
+
+ /* Clear the BSS. */
+ memset(__bss_start, 0, __bss_end - __bss_start);
+
+ return ptr;
+#else
+ return 0;
+#endif
+}