[people/ms/u-boot.git] / arch / arc / lib / start.S

/*
 * 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

	/* Setup stack- and frame-pointers */
	mov	%sp, CONFIG_SYS_INIT_SP_ADDR
	mov	%fp, %sp

	/* Allocate and zero GD, update SP */
	mov	%r0, %sp
	bl	board_init_f_mem

	/* Update stack- and frame-pointers */
	mov	%sp, %r0
	mov	%fp, %sp

	/* 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)
Commit	Line	Data
2f16ac9d AB	1	/*
	2	* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7	#include <asm-offsets.h>
	8	#include <config.h>
4d93617d	9	#include <linux/linkage.h>
2f16ac9d AB	10	#include <asm/arcregs.h>
2f16ac9d AB	11
4d93617d	12	ENTRY(_start)
20a58ac0 IG	13	/* Setup interrupt vector base that matches "__text_start" */
	14	sr __ivt_start, [ARC_AUX_INTR_VEC_BASE]
	15
ef639e6f AB	16	; Disable/enable I-cache according to configuration
	17	lr r5, [ARC_BCR_IC_BUILD]
	18	breq r5, 0, 1f ; I$ doesn't exist
	19	lr r5, [ARC_AUX_IC_CTRL]
	20	#ifndef CONFIG_SYS_ICACHE_OFF
	21	bclr r5, r5, 0 ; 0 - Enable, 1 is Disable
	22	#else
	23	bset r5, r5, 0 ; I$ exists, but is not used
	24	#endif
	25	sr r5, [ARC_AUX_IC_CTRL]
	26
	27	1:
	28	; Disable/enable D-cache according to configuration
	29	lr r5, [ARC_BCR_DC_BUILD]
	30	breq r5, 0, 1f ; D$ doesn't exist
	31	lr r5, [ARC_AUX_DC_CTRL]
	32	bclr r5, r5, 6 ; Invalidate (discard w/o wback)
	33	#ifndef CONFIG_SYS_DCACHE_OFF
	34	bclr r5, r5, 0 ; Enable (+Inv)
	35	#else
	36	bset r5, r5, 0 ; Disable (+Inv)
	37	#endif
	38	sr r5, [ARC_AUX_DC_CTRL]
20a58ac0	39
ef639e6f	40	1:
6eb15e50	41	#ifdef CONFIG_ISA_ARCV2
ef639e6f AB	42	; Disable System-Level Cache (SLC)
	43	lr r5, [ARC_BCR_SLC]
	44	breq r5, 0, 1f ; SLC doesn't exist
	45	lr r5, [ARC_AUX_SLC_CTRL]
	46	bclr r5, r5, 6 ; Invalidate (discard w/o wback)
	47	bclr r5, r5, 0 ; Enable (+Inv)
	48	sr r5, [ARC_AUX_SLC_CTRL]
	49
	50	1:
6eb15e50	51	#endif
ef639e6f AB	52
	53	/* Setup stack- and frame-pointers */
	54	mov %sp, CONFIG_SYS_INIT_SP_ADDR
	55	mov %fp, %sp
20a58ac0	56
f56d625e AB	57	/* Allocate and zero GD, update SP */
	58	mov %r0, %sp
	59	bl board_init_f_mem
	60
	61	/* Update stack- and frame-pointers */
	62	mov %sp, %r0
	63	mov %fp, %sp
	64
20a58ac0 IG	65	/* Zero the one and only argument of "board_init_f" */
	66	mov_s %r0, 0
	67	j board_init_f
4d93617d	68	ENDPROC(_start)
20a58ac0	69
2f16ac9d	70	/*
3fb80163	71	* void board_init_f_r_trampoline(stack-pointer address)
2f16ac9d AB	72	*
	73	* This "function" does not return, instead it continues in RAM
	74	* after relocating the monitor code.
	75	*
3fb80163	76	* r0 = new stack-pointer
2f16ac9d	77	*/
3fb80163 AB	78	ENTRY(board_init_f_r_trampoline)
	79	/* Set up the stack- and frame-pointers */
	80	mov %sp, %r0
2f16ac9d AB	81	mov %fp, %sp
2f16ac9d AB	82
3fb80163 AB	83	/* Update position of intterupt vector table */
	84	lr %r0, [ARC_AUX_INTR_VEC_BASE]
	85	ld %r1, [%r25, GD_RELOC_OFF]
	86	add %r0, %r0, %r1
	87	sr %r0, [ARC_AUX_INTR_VEC_BASE]
2f16ac9d	88
3fb80163 AB	89	/* Re-enter U-Boot by calling board_init_f_r */
	90	j board_init_f_r
	91	ENDPROC(board_init_f_r_trampoline)