arc: check caches existence before use
Some cache operations ({i|d}cache_{enable|disable|status} or
flush_dcache_all) are built and used even if CONFIG_SYS_{I|D}CACHE_OFF
is set.
This is required for force disable of caches on early boot.
What if something was executed before U-boot and enabled caches
(low-level bootloaders, previously run kernel etc.)?
But if CPU doesn't really have caches any attempt to access
cache-related AUX registers triggers instruction error exception.
So for convenience we'll try to avoid exceptions by checking if CPU
actually has caches (we check separately data and instruction cache
existence) at all.
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Igor Guryanov <guryanov@synopsys.com>
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h
index 5d48d11..8ace87f 100644
--- a/arch/arc/include/asm/arcregs.h
+++ b/arch/arc/include/asm/arcregs.h
@@ -24,6 +24,7 @@
#if (CONFIG_ARC_MMU_VER > 2)
#define ARC_AUX_IC_PTAG 0x1E
#endif
+#define ARC_BCR_IC_BUILD 0x77
/* Timer related auxiliary registers */
#define ARC_AUX_TIMER0_CNT 0x21 /* Timer 0 count */
@@ -42,6 +43,7 @@
#if (CONFIG_ARC_MMU_VER > 2)
#define ARC_AUX_DC_PTAG 0x5C
#endif
+#define ARC_BCR_DC_BUILD 0x72
#ifndef __ASSEMBLY__
/* Accessors for auxiliary registers */