[people/ms/u-boot.git] / arch / arm / cpu / armv8 / lowlevel_init.S

/*
 * A lowlevel_init function that sets up the stack to call a C function to
 * perform further init.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <asm-offsets.h>
#include <config.h>
#include <linux/linkage.h>

ENTRY(lowlevel_init)
	/*
	 * Setup a temporary stack. Global data is not available yet.
	 */
#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
	ldr	w0, =CONFIG_SPL_STACK
#else
	ldr	w0, =CONFIG_SYS_INIT_SP_ADDR
#endif
	bic	sp, x0, #0xf	/* 16-byte alignment for ABI compliance */

	/*
	 * Save the old LR(passed in x29) and the current LR to stack
	 */
	stp	x29, x30, [sp, #-16]!

	/*
	 * Call the very early init function. This should do only the
	 * absolute bare minimum to get started. It should not:
	 *
	 * - set up DRAM
	 * - use global_data
	 * - clear BSS
	 * - try to start a console
	 *
	 * For boards with SPL this should be empty since SPL can do all of
	 * this init in the SPL board_init_f() function which is called
	 * immediately after this.
	 */
	bl	s_init
	ldp	x29, x30, [sp]
	ret
ENDPROC(lowlevel_init)
Commit	Line	Data
aa9226f0 AP	1	/*
	2	* A lowlevel_init function that sets up the stack to call a C function to
	3	* perform further init.
	4	*
	5	* SPDX-License-Identifier: GPL-2.0+
	6	*/
	7
	8	#include <asm-offsets.h>
	9	#include <config.h>
	10	#include <linux/linkage.h>
	11
	12	ENTRY(lowlevel_init)
	13	/*
	14	* Setup a temporary stack. Global data is not available yet.
	15	*/
	16	#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
	17	ldr w0, =CONFIG_SPL_STACK
	18	#else
	19	ldr w0, =CONFIG_SYS_INIT_SP_ADDR
	20	#endif
	21	bic sp, x0, #0xf /* 16-byte alignment for ABI compliance */
	22
	23	/*
	24	* Save the old LR(passed in x29) and the current LR to stack
	25	*/
	26	stp x29, x30, [sp, #-16]!
	27
	28	/*
	29	* Call the very early init function. This should do only the
	30	* absolute bare minimum to get started. It should not:
	31	*
	32	* - set up DRAM
	33	* - use global_data
	34	* - clear BSS
	35	* - try to start a console
	36	*
	37	* For boards with SPL this should be empty since SPL can do all of
	38	* this init in the SPL board_init_f() function which is called
	39	* immediately after this.
	40	*/
	41	bl s_init
	42	ldp x29, x30, [sp]
	43	ret
	44	ENDPROC(lowlevel_init)