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/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * 32-bit x86 Startup Code when running from TPL. This is the startup code in
 * SPL, when TPL is used.
 *
 * Copyright 2018 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 */

#include <config.h>

.section .text.start
.code32
.globl _start
.type _start, @function
_start:
	/* Set up memory using the existing stack */
#ifdef CONFIG_X86_NO_REGPARM
	push	%esp
	call	board_init_f_alloc_reserve
	add	$4, %esp
	mov	%eax, %esp
	push	%eax
	call	board_init_f_init_reserve
	add	$4, %esp

	push	$0
	call	board_init_f
	add	$4, %esp
#else
	mov	%esp, %eax
	call	board_init_f_alloc_reserve
	mov	%eax, %esp

	call	board_init_f_init_reserve

	xorl	%eax, %eax
	call	board_init_f
#endif
	call	board_init_f_r

	/* Should not return here */
	jmp	.

.globl board_init_f_r_trampoline
.type board_init_f_r_trampoline, @function
board_init_f_r_trampoline:
	/*
	 * TPL has been executed: SDRAM has been initialised, BSS has been
	 * cleared.
	 *
	 * %eax = Address of top of new stack (or 4(%esp) without regparm)
	 */

	/* Stack grows down from top of SDRAM */
#ifdef CONFIG_X86_NO_REGPARM
	movl	4(%esp), %eax
#endif
	movl	%eax, %esp

	/* Re-enter SPL by calling board_init_f_r() */
	call	board_init_f_r

die:
	hlt
	jmp	die
	hlt