| /* |
| * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <asm-offsets.h> |
| #include <config.h> |
| #include <linux/linkage.h> |
| #include <asm/arcregs.h> |
| |
| ENTRY(_start) |
| /* Setup interrupt vector base that matches "__text_start" */ |
| sr __ivt_start, [ARC_AUX_INTR_VEC_BASE] |
| |
| ; 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] |
| |
| 1: |
| #ifdef CONFIG_ISA_ARCV2 |
| ; 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 |
| |
| /* Establish C runtime stack and frame */ |
| mov %sp, CONFIG_SYS_INIT_SP_ADDR |
| mov %fp, %sp |
| |
| /* Allocate reserved area from current top of stack */ |
| mov %r0, %sp |
| bl board_init_f_alloc_reserve |
| /* Set stack below reserved area, adjust frame pointer accordingly */ |
| mov %sp, %r0 |
| mov %fp, %sp |
| |
| /* Initialize reserved area - note: r0 already contains address */ |
| bl board_init_f_init_reserve |
| |
| /* Zero the one and only argument of "board_init_f" */ |
| mov_s %r0, 0 |
| j board_init_f |
| ENDPROC(_start) |
| |
| /* |
| * void board_init_f_r_trampoline(stack-pointer address) |
| * |
| * This "function" does not return, instead it continues in RAM |
| * after relocating the monitor code. |
| * |
| * r0 = new stack-pointer |
| */ |
| ENTRY(board_init_f_r_trampoline) |
| /* Set up the stack- and frame-pointers */ |
| mov %sp, %r0 |
| mov %fp, %sp |
| |
| /* Update position of intterupt vector table */ |
| lr %r0, [ARC_AUX_INTR_VEC_BASE] |
| ld %r1, [%r25, GD_RELOC_OFF] |
| add %r0, %r0, %r1 |
| sr %r0, [ARC_AUX_INTR_VEC_BASE] |
| |
| /* Re-enter U-Boot by calling board_init_f_r */ |
| j board_init_f_r |
| ENDPROC(board_init_f_r_trampoline) |
