[U-Boot] [Patch v2 2/3] armv8/cache: Flush D-cache, invalidate I-cache for relocation

[York Sun]

If D-cache is enabled, we need to flush it, and invalidate i-cache before
jumping to the new location. This should be done right after relocation.

Signed-off-by: York Sun <yorksun at freescale.com>
CC: David Feng <fenghua at phytium.com.cn>
---
Changed since v1:

 v2: use macro switch_el
     invalidate i-cache by detection of SCTLR.IC

 arch/arm/cpu/armv8/start.S |    6 ------
 arch/arm/lib/relocate_64.S |   19 +++++++++++++++++++
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
index 90daa4d..e70c51d 100644
--- a/arch/arm/cpu/armv8/start.S
+++ b/arch/arm/cpu/armv8/start.S
@@ -122,12 +122,6 @@ ENDPROC(lowlevel_init)
 /*-----------------------------------------------------------------------*/
 
 ENTRY(c_runtime_cpu_setup)
-	/* If I-cache is enabled invalidate it */
-#ifndef CONFIG_SYS_ICACHE_OFF
-	ic	iallu			/* I+BTB cache invalidate */
-	isb	sy
-#endif
-
 	/* Relocate vBAR */
 	adr	x0, vectors
 	switch_el x1, 3f, 2f, 1f
diff --git a/arch/arm/lib/relocate_64.S b/arch/arm/lib/relocate_64.S
index 7fba9e2..5c51cae 100644
--- a/arch/arm/lib/relocate_64.S
+++ b/arch/arm/lib/relocate_64.S
@@ -11,6 +11,7 @@
 #include <asm-offsets.h>
 #include <config.h>
 #include <linux/linkage.h>
+#include <asm/macro.h>
 
 /*
  * void relocate_code (addr_moni)
@@ -19,6 +20,9 @@
  * x0 holds the destination address.
  */
 ENTRY(relocate_code)
+	stp	x29, x30, [sp, #-32]!	/* create a stack frame */
+	mov	x29, sp
+	str	x0, [sp, #16]
 	/*
 	 * Copy u-boot from flash to RAM
 	 */
@@ -32,6 +36,7 @@ copy_loop:
 	stp	x10, x11, [x0], #16	/* copy to   target address [x0] */
 	cmp	x1, x2			/* until source end address [x2] */
 	b.lo	copy_loop
+	str	x0, [sp, #24]
 
 	/*
 	 * Fix .rela.dyn relocations
@@ -54,5 +59,19 @@ fixnext:
 	b.lo	fixloop
 
 relocate_done:
+	switch_el x1, 3f, 2f, 1f
+	bl	hang
+3:	mrs	x0, sctlr_el3
+	b	0f
+2:	mrs	x0, sctlr_el2
+	b	0f
+1:	mrs	x0, sctlr_el1
+0:	tbz	w0, #2, 5f	/* skip flushing cache if disabled */
+	tbz	w0, #12, 4f	/* invalide i-cache is enabled */
+	ic	iallu		/* i-cache invalidate all */
+	isb	sy
+4:	ldp	x0, x1, [sp, #16]
+	bl	__asm_flush_dcache_range
+5:	ldp	x29, x30, [sp],#16
 	ret
 ENDPROC(relocate_code)
-- 
1.7.9.5