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Diffstat (limited to 'drivers/renesas/common/pwrc/call_sram.S')
-rw-r--r--drivers/renesas/common/pwrc/call_sram.S48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/renesas/common/pwrc/call_sram.S b/drivers/renesas/common/pwrc/call_sram.S
new file mode 100644
index 0000000..aa8644c
--- /dev/null
+++ b/drivers/renesas/common/pwrc/call_sram.S
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2015-2019, Renesas Electronics Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+
+.global rcar_pwrc_switch_stack
+
+/*
+ * x0 : jump address,
+ * x1 : stack address,
+ * x2 : arg,
+ * x3 : stack address (temporary)
+ */
+func rcar_pwrc_switch_stack
+
+ /* lr to stack */
+ stp x29, x30, [sp,#-16]
+
+ /* change stack pointer */
+ mov x3, sp
+ mov sp, x1
+
+ /* save stack pointer */
+ sub sp, sp, #16
+ stp x0, x3, [sp]
+
+ /* data synchronization barrier */
+ dsb sy
+
+ /* jump to code */
+ mov x1, x0
+ mov x0, x2
+ blr x1
+
+ /* load stack pointer */
+ ldp x0, x2, [sp,#0]
+
+ /* change stack pointer */
+ mov sp, x2
+
+ /* return */
+ ldp x29, x30, [sp,#-16]
+ ret
+endfunc rcar_pwrc_switch_stack