diff options
Diffstat (limited to 'arch/arc/lib/start.S')
| -rw-r--r-- | arch/arc/lib/start.S | 46 |
1 files changed, 37 insertions, 9 deletions
diff --git a/arch/arc/lib/start.S b/arch/arc/lib/start.S index e1ef19cb88..26a5934189 100644 --- a/arch/arc/lib/start.S +++ b/arch/arc/lib/start.S @@ -13,18 +13,46 @@ ENTRY(_start) /* Setup interrupt vector base that matches "__text_start" */ sr __ivt_start, [ARC_AUX_INTR_VEC_BASE] - /* Setup stack- and frame-pointers */ - mov %sp, CONFIG_SYS_INIT_SP_ADDR - mov %fp, %sp + ; Disable/enable I-cache according to configuration + lr r5, [ARC_BCR_IC_BUILD] + breq r5, 0, 1f ; I$ doesn't exist + lr r5, [ARC_AUX_IC_CTRL] +#ifndef CONFIG_SYS_ICACHE_OFF + bclr r5, r5, 0 ; 0 - Enable, 1 is Disable +#else + bset r5, r5, 0 ; I$ exists, but is not used +#endif + sr r5, [ARC_AUX_IC_CTRL] + +1: + ; Disable/enable D-cache according to configuration + lr r5, [ARC_BCR_DC_BUILD] + breq r5, 0, 1f ; D$ doesn't exist + lr r5, [ARC_AUX_DC_CTRL] + bclr r5, r5, 6 ; Invalidate (discard w/o wback) +#ifndef CONFIG_SYS_DCACHE_OFF + bclr r5, r5, 0 ; Enable (+Inv) +#else + bset r5, r5, 0 ; Disable (+Inv) +#endif + sr r5, [ARC_AUX_DC_CTRL] - /* Unconditionally disable caches */ +1: #ifdef CONFIG_ISA_ARCV2 - bl slc_flush - bl slc_disable + ; Disable System-Level Cache (SLC) + lr r5, [ARC_BCR_SLC] + breq r5, 0, 1f ; SLC doesn't exist + lr r5, [ARC_AUX_SLC_CTRL] + bclr r5, r5, 6 ; Invalidate (discard w/o wback) + bclr r5, r5, 0 ; Enable (+Inv) + sr r5, [ARC_AUX_SLC_CTRL] + +1: #endif - bl flush_dcache_all - bl dcache_disable - bl icache_disable + + /* Setup stack- and frame-pointers */ + mov %sp, CONFIG_SYS_INIT_SP_ADDR + mov %fp, %sp /* Allocate and zero GD, update SP */ mov %r0, %sp |
